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84
P-01
STUDY OF THE PHOTO-DYNAMIC PROPERTIES OF CdSe
QUANTUM DOTS IN INTRA-CELLULAR MEDIA
Nguyen Thanh Binh1, Nguyen Dinh Cong1, Pham Hong Minh1, Marilou Cadatal-
Raduban2, Do Thi Thao3, Vu Thi Bich1,4
1Institute of Physics, Vietnam Academy of Science and Technology
2Centre for Theoretical Chemistry and Physics, Institute of Natural and Mathematical Sciences,
Massey University, Albany, Auckland 0632, New Zealand
3Institute of Bio-Technology, Vietnam academy of Science and Technology
4Duy tan University, Danang
Abstract.
CdSe/CdS quantum dots (QDs) were seeded into Jurkat cells using Polyethylene glycol
(PEG-1500) at different treatment times. Fluorescence microscopy images show that some
QDs stick to the surface of the cells while others appeared to be inside the cells. As it is
difficult to ascertain whether the QDs are indeed inside the cells or just behind the cells,
additional spectroscopic studies were performed. Photoluminescence spectra show that the
fluorescence intensities of the CdSe QDs are different between samples seeded at different
treatment times. Interestingly, the fluorescence lifetimes are also different. This confirms
the interaction between the CdSe QDs and the intra-cellular media and that the QDs were
successfully seeded into the cells.
Fig.1. (a) Fluorescence microscopy image of QDs seeded into Jurkat cells and (b)
fluorescence decay times of samples seeded at different treatment times.
85
P-02
FEMTOSECOND LASER INDUCED PERIODIC SURFACE
STRUCTURES ON POLYIMIDE
S.Y. Kok, S.S. Yap, C.H. Nee and T.Y. Tou
Faculty of Engineering, Multimedia University, Cyberjaya 63100, Selangor, Malaysia
Abstract.
Femtosecond laser interactions with materials differ from that using a nanosecond laser
because of the generation of a high local electric field and the absence of lattice heating
effects. These can contribute to the formation of nano-surface patterns (or ripples) after
irradiation with multiple femtosecond-laser pulses, which have been observed for polymer,
semiconductor and metal. These nano-surface patterns are often called laser-induced
periodic surface structures, or LIPSS. In this work, laser-induced periodic surface
structures are formed after irradiated repeatedly by 500-fs laser pulses on the polyimide
film. The spatial periods of the nano-scale ripples are compared with those formed by
shorter laser pulses and wavelength at 514 nm. Similarly, the orientation of the ripples are
found to depend on the polarization angle of the laser beam, and 2-dimensional arrays of
pyramidal pits are obtained.
86
P-03
INFLUENCES OF SPONTANEOUSLY GENERATED COHERENCE
AND RELATIVE PHASE ON GROUP VELOCITY IN A THREE-
LEVEL ATOMIC MEDIUM: ANALYTICAL APPROACH
Le Nguyen Mai Anh1,2
, Dinh Xuan Khoa1, Le Van Doai
1, and Nguyen Huy Bang
1,*
1Vinh University, 182 Le Duan Street, Vinh City, Vietnam.
2Nong Lam University, Ho Chi Minh city, Vietnam
*E-mail:[email protected]
Abstract.
Electromagnetically induced transparency (EIT) is a quantum interference effect that leads
to reduction of resonant absorption and steeper dispersive for a probe light field [1].
Therefore, the discovery of EIT effect has opened up an excellent solution to control and
slow down the group velocity of light [2].
It is now well known that another kind of quantum interference of spontaneously emission
in the atomic systems with near-degenerate levels occurs due to the non-orthogonality of
dipole matrix elements induced by coherent fields. Such interference can create an
additional atomic coherence, usually called spontaneously generated coherence (SGC) [3].
In the presence of SGC and phase can modify greatly absorption and dispersion of EIT
medium [3, 4] that leads to significant change of group velocity of light [4, 5].
Up to date, influences of SGC and phase on group velocity of light have studied by
numerical method, but there still lack of analytical representation of the group velocity
expression. A precise knowledge of the group velocity expression as a function of the
controllable parameters is needed to optimize the control of group velocity.
In this paper, we will derive the expressions for group velocity of light in three-level
cascade atomic medium in the presence of SGC and relative phase between the probe and
coupling fields. The influences of SGC and relative phase on the absorption, dispersion
and the group velocity of light are studied.
REFERENCES
[1] K.J. Boller, A. Imamoglu, and S.E. Harris, “Observation of electromagnetically induced
transparency” Phys. Rev. Lett., 66 (1991) 2593.
[2] L.V. Hau, S. E. Harris, Z, Dutton, C.H. Bejroozi, “Light speed reduction to 17 metres per
second in an ultracold atomic gas”, Nature 397 (1999) 594.
[3] M. Sahrai, “The effect of the spontaneously generated coherence on the dynamical behaviors of
the dispersion and the absorption”, Eur. Phys. J. Special Topics 160, 383–390 (2008).
[4] S M Mousavi, L Safari, M Mahmoudi and M Sahrai, “Effect of quantum interference on the
optical properties of a three-level V-type atomic system beyond the two-photon resonance
condition”, Journal of Physics B, V 43, N. 16, (2010).
[5] Yan feng Bai, Hong Guo, Dingan Han, Hui Sun, “Effects of spontaneously generated coherence
on the group velocity in a V system”, Phys. Lett A 340 (2005) 342–346.
87
P-04
DETERMINATION OF THE EFFECTIVE POTENTIAL CURVE
FOR THE 21 STATE OF NaLi
Nguyen Tien Dung, Dinh Xuan Khoa, Vu Ngoc Sau, Luong Thi Yen Nga,
Lam Trung Hieu and Nguyen Huy Bang
Vinh University, 182 Le Duan Str., Vinh City, Nghe An
E-mail:[email protected]
Abstract.
In this paper, we determined the potential curve for the 21Π state of NaLi with the
dimensionless root mean of squares of deviation = 0.29. Using this potential curve, we
determined the effective potential curve for different rotational states. This study results
are consistent with the predictions of theoretical works.
REFERENCES
[1] B. Bussery et al.,. Chem. Phys. 116 (1987) 319.
[2] C.E. Fellows, J. Chem. Phys., 94 (1991) 5855-5864.
[3] C.E. Fellows et al.,J. Mol. Spectrosc., 136 (1989) 369.
[4] C.E. Fellows et al., J. Chem. Phys., 93 (1990) 6281.
[5] M. M. Kappe et al., Chem. Phys. Lett., 107 (1984) 6.
[6] Nguyen Tien Dung et al., Comm. in Phys., 21(4) (2011)359-364.
[7] Nguyen Tien Dung et al., Comm. in Phys., 23(2) (2013)135-138
[8] N. Mabrouk et al.., J. Phys. B: At. Mol. Opt. Phys. 41, (2008) 155101.
[9] I. D. Petsalakis et al., Chem. Phys, 362 (1999) 130.
[10] Nguyen Huy Bang et. al.J. Mol. Spectr. 233 (2005) 290.
[11] Nguyen Huy Bang et. al.Optica. Applicata. 36 No4 (2006) 499.
[12] Nguyen Huy Bang et. al. Chem. Phys. Lett. 440 (2007) 199.
[13] Nguyen Huy Bang et. al. Opt. Mat. 31(2009) 527; J. Chem. Phys. 130 (2009) 124307.
[14] S. Jochim et al., Science, 302 (2003) 2101.
88
P-05
EFFECT OF RAMAN SCATTERING AND HIGHER ORDER
DISPERSION ON SUPERCONTINUUM SPECTRUM
Do Thanh Thuy1, Dinh Xuan Khoa
1, Nguyen Thanh Vinh
1,
Bui Dinh Thuan1 and Cao Long Van
2
1)Vinh University, 182 Le Duan Street, Nghe An, Vietnam
2)Institute of Physics, University of Zielona Góra, A. Szafrana 4a, 65-516 Zielona Góra, Poland
E-mail: [email protected]
Abstract.
In this paper, we consider the influence of the raman scattering and higher order dispersion
effects on supercontinuum (SC) generation in microstructure fibers by studying the
temporal and frequency dependence of the ejected pulse. By solving the higher-order
nonlinear Schrödinger equation, we show that the Raman scattering effect can lead to the
breakup of higher-order solitons through the phenomenon of soliton fission. This effect
plays an essential role in several nonlinear phenomena, in particular in the so-called
supercontinuum generation in optical fibers. Moreover, we can use third order dispersion
to compress pulses as well as changing the frequency.
89
P-06
CO2 HYDROGENATION TO CH4 FUEL GAS OVER NICKEL
CATALYST SUPPORTED ON SANTA BARBARA AMORPHOUS
Nguyen Phung Anh1*
, Luu Cam Loc1,2
, Nguyen Truong Giang2, Phan Quoc Dai
2,
Nguyen Thi Thuy Van1, Nguyen Tri
1, Hoang Tien Cuong
1
1Institute of Chemical Technology VAST, 01 Mac Dinh Chi Str., Ho Chi Minh City, Vietnam
2University of Technology VNU-HCM, 268 Ly Thuong Kiet Str., Ho Chi Minh City, Vietnam
E-mail: [email protected]
Abstract.
A series of catalysts withvarying nickel contents supported on Santa Barbara Amorphous
(SBA-15) synthesized by the combination method of sol–gel and hydrothermal were
prepared by the impregnation method and treated at various conditons of calcination in air
and activation in H2 steam. The physico-chemical catalysts were also characterized using
BET nitrogen adsorption, XRD, SEM, TEM and H2-TPR. The activity of obtained
catalysts was investigated in hydrogenation of CO2 recognized as undesirable greenhouse
gas to CH4 fuel gas in temperatures range of 225 400 oC. The obtained results showed
that the function of SBA-15 provided a high dispersity of NiO particles due to their
stabilization within the channels of the mesoporous silicate network, and the catalysts
having nanoparticle size with high surface area (172.6 214.7 m2.g
-1) and large pore
volume (0.24 0.31 m2.g
-1) performed highly activity. Among nickel catalysts, the sapmle
50 wt.% NiO/SBA-15 calcined at 600 oC for 4 hour activated in H2 steam of 50 ml.min
-1 at
450 oC for 4 hours was the best one. With optimum CO2/H2 ratio (1/4) on this catalyst,
CO2 conversion and CH4 selectivity reached 100% at reaction temperature of 400 oC.
Keywords:CO2 hydrogenation, ch4 fuel gas, nickel catalyst, santa barbara amorphous.
s
90
P-07
CONTROLLING GROUP VELOCITY OF LIGHT IN
A DOPPLER BROADENED FIVE-LEVEL EIT MEDIUM
Nguyen Tuan Anh1,3
, Doan Hoai Son2, Le Van Doai
1 and Nguyen Huy Bang
1, *
1Vinh University, Vietnam
2Ha Tinh University, Vietnam
3Ho Chi Minh University of food industry, Vietnam
*E-mail: [email protected]
Abstract.
Electromagnetically induced transparency (EIT) is a quantum interference effect that
makes a resonance medium become transparent and steeper dispersive for a probe light
field under induction of other strong coupling light field. The effect was first observed in
1991 [1]. Since then, EIT has attracted a tremendous interest over the last years due to its
unusual properties and promising potential applications. One of the most promising
applications concerning to EIT is slow-light group velocity [2].
In the beginning of studies on this topic, three-level configurations were the main objects
giving a narrow spectral in which group-velocity is controlled to slow-down or speed-up.
From practical perspective, extension from single to multi-window EIT is currently of
interest due to it gains diversifying usefulness. An example is to simultaneously support
slow group velocity for pulses at different frequencies [3-5] in which light fields has
advantage in production of quantum entanglement.
So far, studies on control of group velocity of light in multi-window EIT media have often
neglected the Doppler effect [3-5]. However, it is fact that photonic devices often operate
at different temperature conditions, so one needs to take into account the influence of
Doppler broadening. In recent work [6] we have derived analytical expressions of the
absorption and dispersion spectra of the five-level atomic system under Doppler
broadening. The results show that the height and slope of dispersion curve strongly depend
on the temperature of medium. Growing of this interest, in this work, we study extensively
the group velocity of light in the Doppler broaden five-level atomic medium by using
analytical method. It is shown that the group velocity of light can be controlled with the
parameters of laser fields and temperature of medium.
REFERENCES
[1] K.J. Boller, A. Imamoglu, S.E. Harris, Observation of electromagnetically induced
transparency,Phys. Rev. Lett. 66 (1991) 2593.
[2] L.V. Hau, S. E. Harris, Z, Dutton, C.H. Bejroozi, Light speed reduction to 17 metres per second
in an ultracold atomic gas, Nature 397 (1999) 594.
[3] L. Li, H. Guo, F. Xiao, X. Peng, and X. Chen, “Control of light in an M-type five-level atomic
system”, J. Opt. Soc. Am. B, Vol. 22, N.6 (2005) 1309-1313.
91
[4] Dingan Han, Yaguang Zeng, Yanfeng Bai, Hui Cao, Weicheng Chen, Chunqing Huang, Hong
Lu, “Controlling the group velocity in a five-level K-type atomic system”, Opt. Comm. 281
(2008) 4712–4714.
[5] J. Wang, L.B. Kong, X.H. Tu, K.J. Jiang, K. Li, H.W. Xiong, Yifu Zhu, M.S. Zhan,
“Electromagnetically induced transparency in multi-level cascade scheme of cold rubidium
atoms”, Phys. Lett. A 328, (2004) 437.
[6] Dinh Xuan Khoa, Pham Van Trong, Le Van Doai and Nguyen Huy Bang, Electromagnetically
induced transparency in a five-level cascade system under Doppler broadening: an analytical
approach,Phys. Scr. 91 (2016) 035401 (7pp).
92
P-08
INFLUENCES OF SPONTANEOUSLY GENERATED COHERENCE
AND PHASE ON OPTICAL BISTABILITY IN A THREE-LEVEL EIT
MEDIUM: ANALYTICAL APPROACH
Le Thi Minh Phuong1,2
, Dinh Xuan Khoa1,Le Van Doai
1 and Nguyen Huy Bang
1
1 Vinh University, 182 Le Duan street, Vinh City, Vietnam
2 Sai Gon University, 273 An Duong Vuong, Ho Chi Minh City
*E-mail:[email protected]
Abstract.
Optical bistability (OB) is one of the most interesting fields of research in nonlinear optics
because it has a large number of potential applications in both optical sciences and
photonics technology. In the early year of the OB research for atomic media, a great
interest was focused on using two-level atomic systems [1]. Although the usual OB
behaviors of the two-level atomic system were observed experimentally but there is still
lack of applications due to only one optical field being employed for both applying and
switching, thus lack of control for switching intensity thresholds.
The advent of electromagnetically induced transparency - EIT [2] provides excellent media
that make an impressive progress in OB research because of their controllable optical
properties [3]. Due to such controllable optical properties, both switching intensity
thresholds and width of OB can be simply controlled and reduced significantly [4].
Besides the OB behaviors in EIT media can be controlled by either intensity or frequency
of applied fields, due to the laser field is also characterized by other important parameters
as phase and polarization (may create spontaneously generated coherence - SGC),
therefore, they also have a significant influence on the OB behaviors. Recent studies [5, 6]
show that the OB behaviors are very sensitive to phase and polarization.
Although, the influences of SGC and phase on OB behaviors have studied by numerical
method, but there still lack of analytical representation of the input-out intensity relation.
Such shortage has hampered implementation of further studies related to OB behaviors,
e.g., controlling threshold intensity and width of OB.
In this work, we develop a analytical method on the bistability behavior of three-level
atomic systems in the SGC and relative phase. The influences of controllable parameters of
the coupling light, cooperation of atomic medium and SGC and relative phase on OB
behaviors are investigated.
REFERENCES
[1] E Abraham and S D Smith, “Optical bistability and related devices”, Rep. Prog. Phys., Vol. 45
(1982) 815-885.
[2] K.J. Boller, A. Imamoglu, S.E. Harris, “Observation of electromagnetically induced
transparency”, Phys. Rev. Lett., 66 (1991) 2593.
93
[3] Amitabh Joshi, Min Xiao, "Controlling steady-state and dynamical properties of atomic optical
bistability",World Scientific Publishing, 2012.
[4] Hai Wang, D. J. Goorskey, and Min Xiao, “Bistability and instability of three-level atoms
inside an optical cavity”, Phys. Rev A, Vol 65, 011801R (2001).
[5] A. Joshi, W. Yang, M. Xiao, “Effect of spontaneously generated coherence on optical
bistability in three-level Λ-type atomic system”, Phys. Lett. A. 315, 203–207 (2003).
[6] H. Li, H. Zhang, H. Sun, X. Hu, D. Sun, and X. Li, Applied Optics, Vol. 56, No. 17 (2017).
.
94
P-09
SUBCRITICAL VERSUS SUPERCRITICAL BIFURCATION
CHARACTERISTICS OF SYMMETRY BREAKING IN
NONLINEAR DOUBLE-CHANNELS SYSTEMS
Nguyen Duy Cuong 1, 2*
, Dinh Xuan Khoa1, Cao Long Van
3, M. Trippenbach
4, 5and
Bui Dinh Thuan1, Do Thanh Thuy
1
1Vinh University, 182 Le Duan Street, Vinh City, Vietnam.
2 Industrial University of Vinh, 26 Nguyen Thai Hoc Street, Vinh City, Vietnam.
3 University of Zielona Góra, ul. Licealna 9, 65-417 Zielona Góra, Poland.
4Institute of Theoretical Physics, Physics Department, Warsaw University, Hoża 69, PL-00-681
Warsaw, Poland.
5 Soltan Institute for Nuclear Studies, Hoża 69, PL-00-681 Warsaw, Poland
*E-mail:[email protected]
Abtract.
Recently, considering the effects of spontaneous symmetry breaking (SSB) in nonlinear
symtems have attracted much interest of scientists [1-8]. In optics, the SSB occurs as a
result of the interplay between the nonlinearity and waveguiding structures, when the
strong nonlinearity partly suppresses the linear coupling between parallel guiding cores,
example in self-focusing Kerr medium [1]. The onset of a sharp symmetry-breaking
instability in a double-hump two component spatial optical soliton was demonstrated
experimentally in a planar nonlinear waveguide [2]. The analysis of the SSB for soliton
modes was performed in models of dual-core fiber Bragg gratings with the Kerr
nonlinearity [3], and coupled waveguides with the quadratic [4] and cubic-quintic [5]
nonlinear terms. However, to the best of our knowledge, SSB phenomena in nonlinear
double-wells optical system have not been complete studied yet
In this work, we propose a double-channel model, in each channel include a nonlinear
single-well potential (alias a single-well pseudopotential) and linear coupling between two
channels, with the objective to study an alternative implementation of the spontaneous
symmetry breaking (SSB) in nonlinear dual-cores optical fibers.
In the limit case when the nonlinear single-well potential structure is induced by the local
nonlinearity coefficient represented by a single delta functions, a fully analytical solution is
obtained for symmetric, antisymmetric, and asymmetric states. Numerical analysis, based
on both direct simulations and computation of stability eigenvalues, demonstrates that,
while the symmetric states are stable up to the SSB bifurcation point, both symmetric and
emerging asymmetric states, as well as all antisymmetric ones, are unstable in the model
with the delta functions. In this solvable model, the SSB bifurcation has a fully subcritical
character. In the general model with a finite width of the nonlinear-potential wells, based
on Imaginary-Time Method (ITM), and computation of stability eigenvalues show that, the
asymmetric states quickly become stable, the SSB bifurcation is also the subcritical type. A
full diagram for the existence and stability of the trapped states in the model is produced.
95
REFERENCES
1. K. Hayata and M. Koshiba, J. Opt. Soc. Am. B 9, 1362 1992.
2. C. Cambournac, T. Sylvestre, H. Maillotte, B. Vanderlinden, P. Kockaert, Ph. Emplit, and M.
Haelterman, Phys. Rev. Lett. 89, 083901 2002.
3. Y. J. Tsofe and B. A. Malomed, Phys. Rev.E 75, 056603 2007.
4. W. C. K. Mak, B. A. Malomed, and P. L. Chu, Phys. Rev. E 55, 6134 1997.
5. L. Albuch and B. A. Malomed, Math. Comput. Simul. 74, 312 2007.
6. M. Matuszewski, B. A. Malomed, and M.Trippenbach, Phys. Rev. A 75. 063621 (2007).
7. T. Mayteevarunyoo, B. A. Malomed, and G. Dong, Phys. Rev. A 78, 053601 (2008).
8. Elad Shamriz, Nir Dror, and Boris A. Malomed, Phys. Opt. (2016).
96
P-10
THERMAL LOCAL TRANSLATION REMOTE CONTROL WITH
SINGLE GOLD NANOCRESCENT
Xuan Hoa Vu1,*
, Nguyen Vu Anh Tuyet1, Nguyen Vu Anh Nguyet
1,
Pham Thi Thu Ha1 and Emmanuel Fort
2
1Thai Nguyen University of Science (TNUS), Tan Thinh, Thai Nguyen City, Vietnam
2Centre d’Imageries Plasmoniques Appliquées, Institut Langevin ESPCI ParisTech, CNRS UMR
7587, & INSERM ERL U979,1 rue Jussieu, 75231 Paris Cedex 05, France
E-mail: [email protected], [email protected]
Abstract.
Developping nanodevices able to probe materials at the nanoscale and to act on them is of
critical importance to understand complex and multiscale systems such as heterogeneous
fluids or living cells, the very local properties of such systems differing from the
macroscopic ones.
Here, we propose to use gold semi-coated magnetic nanoparticles, called gold
nanocrescents, both to access the local properties of such complex systems and to perturb
them at the nanoscale. These particles are produced by nanosphere lithography,
evaporating a 30 nm thick layer of gold on magnetic 160 nm nanospheres.
These gold nanoparticles possess a strong plasmon resonance which gives them a strong
scattering crosssection. They can thus be easily tracked using darkeld microscopy.
Moreover, their asymmetrical shape induces a splitting of the plasmon resonance. This
optical anisotropy allows one to follow their rotational dynamics. From the autocorrelation
of the scattered intensity signal one can access the nanoscrescent rotational diffusion time.
Hence, from both, the translational and rotational Brownian diffusions of the nanocrescents
it is possible to probe the local nanorheology of a material.
Moreover, these nanoparticles can also serve as active nanosensors. Due to their magnetic
properties,they can be submitted to an external force via an applied magnetic gradient.
Besides, using an incident laser at the wavelength of the plasmon resonance, the
nanocrescents can be heated. The environment can thus be perturbed locally in a tunable
and remote way, the same nano-object being simultaneously a nano-source and a nano-
probe.
We will present results showing that this technique is very promising for performing active
nanorheology on complex materials and in particular on living systems such as
intracellular compartments.
Keywords:plasmon, nanoparticle, translation temperature, Brownian motion, scattering
correlation spectroscopy.
97
P-11
FINITE DIFFERENCE METHOD TO DETERMINE LATERAL LOAD
BEARING CAPACITY OF PILE BY TAKEN INTO ACCOUNT SOIL
AND PILE INTERACTION
Dang Hong Lam1, Tran Ngoc Tuyen
2
1) Faculty of Civil engineering, University of Transport and Communication, No.3 Cau Giay Street,
Lang Thuong Ward, Dong Da District, Hanoi, Vietnam
2) Faculty of Engineering and Techtology, Hatinh University, No.447 Road 26-3, Hatinh, Vietnam
E-mail: [email protected]
Abstract.
The lateral load bearing capacity of pile is an attractive issue not only in road and bridge
construction field but also in industry one. Some first studies are proposed by Broms B.
B.(1964) [1], Matlock H.(1970), Reese L. C.(1974), etc… to determine the ultimate lateral
load bearing capacity and they are favorite for tentative estimation of the lateral load
bearing capacity of single pile with many prior assumptions. These results need to be
developed for varies cases in which the prior assumptions may not satisfy such as the
aquifer is complicated to stratum. Recent decades, base on the expanse of computer
science, some numerical methods, such as finite difference method, were proposed and
studied with the aptness of soil-pile interaction [2]. This interaction is major factor to
distribution of shear load and moment load of longitudinal pile, called P-y curves. Finite
difference method is implemented [3] in this paper to determine the lateral load bearing
capacity of a pile in conjunction with soil and pile interaction. The calculated results are
then compared with the results from widely used FB-Pier program. Finally, comments and
recommendations are given for lateral load bearing capacity determination in engineering
practices and current standards for example 22TCN 272-05, ASSHTO.
Keywords:Lateral load bearing capacity, Pile, Finite difference method, FB-Pier, Soil
and pile interaction, P-y curves.
REFERENCES
[1] Broms B. B., Lateral resistance of piles in cohesive soils, ASCE Journal for Soil Mechanics and
Foundation Engineering,American Society of Civil Engineers, Reston, VA, Vol. 90, SM2, 1964,
pp.27-63,
[2] Zhang J., Yuan H., Zhang S., Research Review on Bearing Capacity Behavior of Pile
Foundation under Lateral Load, Advanced Materials Research, Vols. 594-597 (2012) pp 2740-
2743
[3] DANG H. L., Calculation of lateral load bearing capacity of drilled pile in consideration
between soil and pile, Master thesis, University of Transport and Communication, Hanoi, 2009
(by Vietnamese language).
98
P-12
DETERMINATION OF FAULTS IN THE MEKONG DELTA
USING MAGNETIC DATA
Nguyen Hong Hai1,2
1An Giang University
2VNU HCM – University of Science
E-mail: [email protected]
Abstract.
Magnetic exploration is one of the important geophysical methods for identifying deep
geological structures. In this article, we determined faults in the Mekong delta (interior of
Southern Vietnam) based on the magnetic data. The magnetic map of the study area was
first corrected by the application of the Reduction To the magnetic pole (for low latitude
area). Among the different processing techniques that can be applied to the magnetic data,
we chose to use the total horizontal derivative, the tilt-angle and the analytical signal,
which aim at locating and delineating the faults. The results verified the faults mentioned
before and determined new faults (if any).
REFERENCES
[1] Blakely, R.J. 1995.“Potential theory in gravity and magnetic applications”. USA: Cambridge
University Press.
[2] Cao Dinh Trieu. 2005. “Tr ng a v t l v c u tr c th ch quy n l nh th Vi t Nam”.
Vietnam: Science and Technics Publishing House.
[3] Cordell, L., Grauch, V. J. S. 1982. “Mapping basement magnetization zones from aeromagnetic
data in the San Juan Basin, New Mexico”, Presented at the 52nd Ann. Internat. Mtg., Soc.
Explor. Geophys., Dallas, 246247.
[4] Dang Thanh Hai, Cao Dinh Trieu. 2006. “Đứt gãy ho t ộng v ộng t ở
miền Nam Vi t Nam”. Journal of Geology A(297) 11-23.
[5] Le Huy Minh, Luu Viet Hung, Cao Dinh Trieu. 2002. “Sử dụng tr ng vectơ gra ien ngang
cực i trong vi c minh giải số li u từ và trọng lực ở Vi t Nam”. Vietnam Journal of Earth
Sciences (24/1) 67-80.
[6] Macleod, I.N., Jones, K., Dai,T.F. 1993. “3-D analytic signal in the interpretation of total
magnetic field data at low magnetic latitude”, Exploration Geophysics (24) 679–688
[7] Nguyen Hong Hai, Huynh Thanh Nhan, Dang Van Liet, Nguyen Ngoc Thu. 2016. “Enhancing
the quality of magnetic data at low latitudes”, Presented at the 10th SCIENTIFIC
CONFERENCE UNIVERSITY OF SCIENCE – VNUHCM, Vietnam.
[8] Nguyen Hong Hai, Nguyen Tran Thuy An, Dang Van Liet, Nguyen Ngoc Thu. 2016.
“Determination of faults in the Southern Vietnam using gravity data”, Proceedings Workshop
on capacity building on geophysical technology in mineral exploration and assessment on land,
sea and island, pp 95 -105, Vietnam: Publishing house for Science and Technology, ISBN 978-
604-913-499-9
[9] Tran Vinh Tuan, Dang Van Liet, “Tr ng a từ v Thăm dò từ”, Vietnam: VNU-HCM
Publishing House.
99
P-13
MAXIMIZING THE ROBUSTNESS OF DATA ANALYSIS
IN MULTICHANNEL ANALYSIS OF SURFACE WAVE
Nguyen Nhat Kim Ngan1, Truong Phuc Thinh
2,
Nguyen Thanh Van1, Vo Manh Khuong
1
1) Geophysics Department, University of Science, HCM National University, 227 Nguyen Van Cu,
District 5, Ho Chi Minh City
2)East Sea Star Software company, 22D8 Saigon Pearl, HCM City
E-mail: [email protected]
Abstract.
Multichannel analysis of surface wave (MASW) is one of novel seismic methods in
geophysics. MASW is used to survey the stiffness of the soil though shear velocity (VS) by
analyzing the spectral image of surface wave. We have conducted the 1D data using
MASW at one borehole on area, which belongs to the residential development project,
district 2, Ho Chi Minh City with different orientations and offsets of source Then we
combined seismic data to maximize the robustness of data analysis including minimize
adverse influence from the near-field effects and average the lateral variation of the
subsurface velocity model. From the obtained data, we carried out the geophysics inversion
problem to define the shear velocity (VS) of the soil under the ground. The achieved results
were compatible to petrographic components in geological borehole and another seismic
method (downhole). Comparing to VS values of downhole following every meter depth,
the relative error of interpretation of combined data is less than or equal to 10%.
Keywords: MASW, shear velocity, downhole.
100
P-14
DEFINING THE CHARACTERISTICS OF SOIL ENVIRONMENT
USING MULTICHANNEL ANALYSIS OF SURFACE WAVE
AND ELECTRIC IMAGING METHOD
Nguyen Nhat Kim Ngan, Vo Minh Triet, Nguyen Van Thuan
Geophysics Department, University of Science, HCM National University, 227 Nguyen Van Cu,
District 5, Ho Chi Minh City
E-mail: [email protected]
Abstract.
We conducted the survey on the constructive foundation to define velocities, elastic
parameters and resistivity of soil by the combination of Multichannel Analysis of Surface
Wave (MASW) as one of seismic methods and Electric Imaging method. The obtained
results of two methods were displayed in 2D profiles (along survey line and depth) and
exhibited good agreement about the structure of geology under the ground. The soil
structures from the surface to 20 m depth could be divided in to three layers: fine sand, soft
dark-gray organic silty clay and stiff green-gray lean clay. Every layer with diverse
velocities and resistivity showed the difference of petrographic component, elastic
properties and electrical impedance of the soil under the ground. In addition, the results
from MASW and Electric Imaging were consistent with those of borehole‟s petrographic
component at the same area of collected data.
Keywords:MASW, resistivity, seismic, Electric Imaging.
101
P-15
THE UPHILL DIFFUSION AND DIFFUSION BARRIER
IN SINGLE COMPONENT SYSTEMS
Vu Ba Dung, Ho Quynh Anh, Tong Ba Tuan and Dinh Van Thien
Hanoi University of Mining and Geology, Viet Nam
E-mail: [email protected]
Abstract.
Uphill diffusion and diffusion barrier are interesting diffusion processes. The diffusing flux
of the uphill diffusion goes to a higher concentration area and the diffusing flux of
diffusion barrier does not vanish although concentration gradient equals to zero. Most of
the uphill diffusion and diffusion barrier takes place in multicomponent systems and their
cause are the diffusion flux of any species is coupled with that of its partner species. In this
paper, based on the kinetic theory of gasses and thermodynamics the uphill diffusion and
diffusion barrier in single component systems (single uphill diffusion and single diffusion
barrier) are studied and discussed. Results showed that: i) The uphill and osmotic diffusion
can take place for only one component systems; ii) the cause of single uphill and osmotic
diffusion is thermal velocity of molecules in low concentration region is larger than that in
high concentration region; iii) The single uphill diffusion and the single diffusion barrier
opposite to Fick‟s laws, but which agree with the increasing entropy principle of the
thermodynamics theory.
102
P-16
THE EXPERIMENT SINGLE UPHILL DIFFUSION
OF GLYCEROL IN WATER
Vu Ba Dung, Tong Ba Tuan, Ho Quynh Anhand Dinh Van Thien
Hanoi University of Mining and Geology, Vietnam
E-mail: [email protected]
Abstract.
Sing uphill diffusion has been demonstrated by the kinetic theory of gasses and the
thermodynamics theory. Uphill diffusion is a process of mass transmission in which the
diffusion flux goes up to high concentration region and the mass flux of osmotic diffusion
is not vanishing, when concentration gradient is equal to zero. Most of the uphill and
osmotic diffusion takes place in multicomponent systems and the cause of uphill diffusion
is the diffusion flux of any species is coupled with that of its partner species. In this paper,
the uphill diffusion in single component systems is studied by experiment for glycerol in
water. Results showed that: i) The uphill diffusion can occur in single component systems;
ii) the cause of single uphill and osmotic diffusion is thermal velocity of molecules in low
concentration region is greater than that in high concentration region; iii) the experimental
results agree with the theory.
103
P-17
CONTROL THE TRAPPED PARTICLES IN ACOUSTO-OPTICAL
TWEEZERS BY ACOUSTIC FREQUENCY
Nguyen Van Thinh1, Nguyen Mạnh Thang
2, Nguyen Thu Loan
3,
Thai Doan Thanh4, Quy Ho Quang
4
1University of Baclieu, 178 Vo Thi Sau, Bac Lieu.
2Academy of Military Science and Technology, 17 Hoang Sam, Cau Giay, Hanoi
3Tran Nguyen Han College of Haiphong
4Faculty of Electric Technology & Electronics, Food industry University of HCM City, 140 Le
Trong Tan, Tan Phu, HCM City
E-mail: [email protected], [email protected], [email protected]
[email protected], [email protected]
Abstract.
The systematical equations using to control the trapped particles in 3D space of acoustic-
optical tweezers (Fig.1) is introduced. The facts influence on the position of trapped
particles in 3D space are discussed. The trajectories of trapped particle under the different
single tweezers (Fig.2) are theoretically observed by the calibration of initial phase and
frequency of acoustic waves. The obtained results show that the acoustic frequency is the
fact only can be used to control the trapped particles in 3D space, that is different to the
classical optical tweezers, which uses two facts at least.
Keywords: Acousto-optical tweezers, Tweezers arrays, Dielectric particle, Position
control.
Fig. 1. Model of acousto-optical tweezers (left),
and propagating directions of two acoustic
waves (rigth).
Fig.2.The trajectories of position of single
tweezer T1j and Ti1with calibration of
frequency.
REFERENCES
[1] Q. Ho, J. Phys. Scien. and Appl., Vol. 2 (2012),301-305.
[2] Honglian Y. Xincheng et al, Science in China, Vol. 45 (2013), 919- 925.
[3] C. Neuman and S. M. Block, Rev. of Scient. IntrumentsVol. 75 (2004), 2787-2809.
[4] European Network of Excellence for Biophotonics, Networking for Better Health Care,
http://www.Photonics4life.eu/lavout/set/Consortium/P4L-DB/All-items/ (2014).
[5] Trung T. D., Khoa D. Q., Kien B. X., Quy H. Q., Opt. Quant Electron48 (2016), 561.
[6] Thinh N. V., Quy H. Q., J. of Physical Science and Applications, Vol. 4, (2014), 420-425.
[7] Thinh N. V., Quy H. Q., Lanh C. V., Commun. in Physics, Vol.25, (2015), 157-163.
[8] Nguyen Van Thinh, Doctoral thesis, Vinh University, 2017.
[9] Neilo Savage, Nature Photonics 4 (2010), 728-729.
[10] M. S. Ipatov, et al., Acoustical PhysicsVol.59 (2012), 426-433.
104
P-18
SHIFTED-LOCALIZED SURFACE PLASMON RESONANCE
ABSORPTION BASED CONTROL THE SYNTHESIS OF SILVER
NANOPARTICLES BY PHOTOCHEMICAL METHOD
Pham Thi My Hanh2, Pham Thanh Binh
1, Dang Duc Toan
2, Pham Van Dai
1,
Do Thuy Chi2, Bui Huy
1, Ngo Quang Minh
1, Pham Van Hoi
1
1) Institute of Materials Science, VAST, 18 Hoang Quoc Viet Rd, Caugiay Dist, Hanoi, Vietnam
2) Thai Nguyen University of Education, 20 Luong Ngoc Quyen Rd, Thai Nguyen city, Vietnam
E-mail: [email protected]
Abstract.
Nanoparticles of noble metal such as gold, silver, palladium… have been immense
attention due to the wide range of new applications in various fields of industry. Specially,
silver nanoparticles (AgNPs) have significant interested in medical application, chemical-
biosensor, and industry application because of their unique properties such as size and
shape depending optical, antimicrobial, and electrical properties. There are many of
preparation techniques for the synthesis of AgNPs such as laser ablation, gamma
irradiation, electron irradiation, chemical reduction, photochemical methods, microwave
processing, and biological synthetic methods. In this paper, photochemical methods have
been realized for the synthesis of AgNPs, the advantages of this method are that they have
excellent spatial and temporal control, avoid the use of harmful strong reducing agents and
are frequently room temperature procedures. The size and shape of AgNPs have been
controlled through irradiating a solution of AgNP seeds in the synthesis processing. The
achieved triangle-plates AgNPs with particle size 10nm÷80nm corresponding to LED
irradiation 520 nm with exposed time 5 hours÷24 hours. Optical properties of AgNPs are
drastically influenced by their size and shape. Shifted-localized surface Plasmon resonance
absorption peak of AgNPs from 412 nm to 1090 nm was achieved. The outcomes of this
study may provide leads to study of localized surface Plasmon resonance (LSPR)-based
optical sensor systems with immobilized AgNPs on optical fibers.
REFERENCES
[1] K. G. Stamplecoskie and J. C. Scaiano, J. AM. CHEM. SOC.132, 2010, pp. 1825.
[2] M. Rycenga, C. M. Cobley, J. Zeng, W. Li, C. H. Moran, Q. Zhang, D. Qin, and Y. Xia,
CHEM. REV. 111, 2011, pp. 3669.
[3] R. Bharadwaj, S. Mukherji, and S. Mukherji, Plasmonics, 2015, DOI 10.1007/s11468-015-
0106-0.
[4] R. A. Minz, S. S. Pal, R. K. Sinha, and S. K. Mondal, Plasmonics,11, 2016, pp. 653.
[5] T. B. Pham, H. T. Le, H. Bui, and V. H. Pham, Sensors, 7, 2017, DOI 10.3390/s17010007.
105
P-19
ISOLATION STUDY OF THE GmNFYB GENE INVOLVED IN
DROUGHT – STRESSED RESPONSES
Nguyen Thi Thu Nga, Nguyen Thi Tuyet
Faculty of Biology, TNU - University of Education, Thai Nguyen city,
20 Luong Ngoc Quyen Street, Thai Nguyen City, Vietnam
Abstract.
Improved productivity under periodic drought stress is a major challenge for global
agriculture. Increasing the yield of agricultural crops grown under drought conditions is
challenging because of the low heritability of the trait, the unpredictable nature of most
periods of drought stress encountered in growing areas, and gaps in our understanding of
drought biology. As a consequence, new approaches were sought for improving the
performance of crops grown under periodic drought conditions.
Because there are many mechanisms by which plants can tolerate drought, and because
transcription factors are well established as regulators of genetic pathways, we reasoned
that additional transcription factors would exist that modulate drought responses. A
genome-wide systematic analysis of Arabidopsis transcription factor families was
conducted to identify genes that improve tolerance to environmental stress. A selection of
transcription factors was discovered from a range of families that condition enhanced
abiotic stress tolerance when constitutively expressed in plant.
Nuclear factor Y (NF-Y) is an evolutionarily conserved trimeric transcription factor
complex present in nearly all eukaryotes. The heterotrimeric NF-Y complex consists of
three subunits, NF-YA, NF-YB, and NF-YC, and binds to the CCAAT box in the promoter
regions of its target genes to regulate their expression.
NF-Y transcription factors typically act in concert with other regulatory factors to
modulate gene expression in a highly controlled manner. In plants, NF-Y genes have been
amplified with ≈10 different genes encoding each subunit of the transcription factor
complex. Amplification of the family raises the possibility that new and divergent
functions of heterotrimeric complexes have evolved in plants.
We identified an NF-YB gene from Glycine max responsive to plant responses to drought
tolerance. GmNF-YB gene was successfully isolated from mRNA by RT-PCR reaction
with specific GmNF-YB-F/GmNF-YB-R primers. The isolated 529 nucleotide fragment,
coding 169 amino acid. The nucleotide sequence of the GmNF-YB gene (DT2008) is
similar to the nucleotide sequence coded at XM00356285 of 99.1% on the gene bank.
These results can be used for further studies on drought tolerance in plants.
REFERENCES
[1] P.P. Repetti, et al. (2007), Proc Natl Acad Sci U S A Vol.104 : pp.16450 - 16455.
[2] T.J. Stephenson, et al., Plant Mol Biol,pp.77-92. [3] D.H. Yan, et al, Plant Mol Biol Report : 1- 8.
106
P-20 STUDY OF OPTICS CREATING A LASER GAUSSIAN BEAM
FOR OPTICAL TWEEZERS
Doan Quoc Tuan1, Nguyen Thu Cam
2, Quy Ho Quang
3
1Center for Stadards, Measurement and Quality
2 Institute of Applied Physics/ Academy of Military Science and Technology
3Faculty of Electric Technology & Electronics, Food industry University of HCM City
E-mail: [email protected], [email protected]
Abstract.
In this paper, the optical system for creation the laser Gaussian beam used for optical
tweezers is proposed. Based on transfer matrix the optical system is designed and
optimized by the Zemax solfware. The optical properties of system are evaluated based on
enucleated results. The dependence of intensity distribution round of target plane on some
system‟s parameters is investigated and then discussed about the condition to use its for
optical tweezers to trap the dielectric particles with lower refractive index.
Keywords: Optical tweezers, Optical system, Zemax solfware, Gaussian distribution.
Fig.1.Optics designed by Zemax solfware (a) and optical field distribution at target.
REFERENCES
[1]. Mavago, P.H. Jone, P.G. Gucciari, G. Volpe, and A.C. Ferrari, Nature Nanotechnology 8, 807-
819 Doi: 10.1038/nnano. 2013.208 (2013).
[2]. M.P. MacDonald, I. Peterson, W. Sibbett, and K. Dholakia, Opt. Lett. 26, 863-865 (2002).
[3]. L. Zhao, L. G. Wang, X. H. Lu, Phys. Lett. A, pp.502-506 (2006).
[4]. Cun Wei, Xingyuan Lu, Gaofeng Wu, Fei Wang, Yangjian Cai, App. Phys. B115, Issue 1, 55-
60 (2014).
[5]. Simon Pleasants,Nature Photonics 8, 423, doi:10.1038/nphoton.2014.128 (2014).
[6]. Lei Gong, Weiwei Liu, Qian Zhao, Yuxuan Ren, Xingze Qiu, Mincheng Zhong and Yinmei Li,
Scientific Reports 6, 29001 | DOI: 10.1038/srep29001 (2015).
[7]. Ahmed Abdulrab Ali Ebrahim, Lahcen Ez-zariy, Abdelmajid Belafhal, International Journal of
Advancement in Earth and Environmental Sciences (IJAEES), 3, 11-20 (2015).
[8]. Bahaa E. A. Saleh, Malvin Carl Teich (1991), Fundamental Fundamentals of Photonics, ISBN:
0471213748 (Electronic) 0471839655 (Print). Copyright © 1991 John Wiley & Sons, Inc.
[9]. Trung Thai Dinh, Khoa Doan Quoc, Kien Bui Xuan, Quy Ho Quang, Opt Quant Electron 48,
561, DOI 10.1007/s11082-016-0843-0 (2016).
[10]. Van Hoang, N., Cao Thanh, L., Ho Quang, Q.: Influence of Kerr effect on tweezers center
location in nonlinear medium. Int. J. Eng. Innova. Tech. 3, 134–138 (2013).
107
P-21
CLASSIFICATION AND DETECTION OF
ELECTROENCEPHALOGRAPHY WAVES
Hanh Thi Hong Nguyen, Tuan Van Huynh
Faculty of Physics and Engineering Physics, University of Science, Vietnam National University,
Ho Chi Minh City, Viet Nam
E-mail: [email protected], [email protected]
Abstract.
Advancements in biomedical signal processing techniques have led Electroence--
phalography (EEG) signal is widely used to analyze neural activity within the human brain
for detection of any abnormalities. Since the EEG signal is dynamic by nature and changes
constantly a highly sensitive yet robust system is required to monitor the activities.
EEG is an electrophysiological monitoring method to record electrical activity of the brain.
It is typically noninvasive, with the electrodes placed in different positions on the scalp
corresponding to the region of the cortex on the computer graph [1, 2]. Regarding to
different areas of the brain, the human brain is divided into 3 parts e.g. cerebrum,
cerebellum and brain stem. The cerebrum is the largest and upper most portion of the
brain. The cerebellum controls coordination of muscle activity and maintains balance. The
brain controls the function alities of the heart, the lungs, production of hormones and the
thoughts [1, 3]. All our thoughts, emotions and behaviors are the communications between
masses of neurons within our brains leading to a production of brainwaves by
synchronized electrical pulses. Specific, neurons in the brain communicate through
electrical impulses that give rise to both electrical and magnetic fields which are
categorized into five different band limits. These waves can be measured outside the skull
through an EEG. Thus, by placing the brain-wave sensors on the scalp, we are able to
acquire the brain signals. These signals reflect differences of actions and the mental status
of a person. Therefore, the brain wave signals have been applied widely in diagnosis and
monitoring in health care and multiple applications in different fields. In this research aims
to use Emotiv EPOC+ to collect the EEG signals in order to analyze and determine the
characteristics of people's status as "closed-eyes", "opened-eyes" and "funny" by two
different methodologies e.g. the Digital Filters (DF) and the Discrete Wavelet Transform
(DWT). The results have identified states such as "closed-eyes", "opened-eyes" and
"funny" on both methods. Furthermore, this research concluded that the DF method is
more effective than the DWT method.
REFERENCES
[1] Ariely, D., & Berns, G. S. (2010). Neuromarketing: The hope and hype of neuroimaging in
business. Nature Reviews Neuroscience, 11, 284–292
[2] Sörnmo, L. & Laguna, P. (2005), Bioelectrical Signal Processing in Cardiac and Deurological
Applications, Academic Press.
[3] Stuart J. Johnstone (2012), EEG From A Single-Channel Dry-Sensor Recording Device,
University of Wollongong.
108
P-22
SYNTHESIS AND CHARACTERIZATION OF CESIUM TIN IODIDE
PEROVSKITE THIN FILMS AS HOLE TRANSPORT MATERIALS
Lien Thi Dao Thach1,2
, Thanh Tien Nguyen1,2
, Dong Chung Nguyen1,
Oanh Thi Tu Nguyen1, Hieu Si Nguyen
1, Chung Vu Hoang
1,
Chi Ha Le1,*
, Long Duy Pham1,*
1) Institute of Materials Science, Vietnam Academy of Science and Technology,
18 Hoang Quoc Viet street, Hanoi, Vietnam
2) University of Science and Technology of Hanoi (USTH),
18 Hoang Quoc Viet street, Hanoi, Vietnam
E-mail: [email protected], [email protected]
Abstract.
Perovskite solar cells (PSC) have attracted enormous attention due to the rapid growth of
efficiency to 22.1 % in recent years. Here we report the solution processed approach for
lead-free molecular iodosalt compounds to fabricate cesium tin iodide perovskite thin
films. The impact of the concentration of SnF2 additive on the crystalline structure,
morphology and properties of cesium tin iodide perovskite was investigated. The phase
transformation of the pure - CsSnI3 perovskite and SnF2 additive - CsSnI3 perovskite
materials to more stable Cs2SnI6 perovskite under ambient condition were observed. The
absorbance and photoluminescence spectra exhibit the bandgap of semiconducting cesium
tin iodide perovskites. The electrical properties of the perovskite films were measured by a
Hall Effect system. These optoelectronic properties demonstrate that cesium tin iodide
perovskites with high hole mobility can be used as a hole transporter for solid state solar
cell applications.
109
P-23
THE OPTICAL AND ELECTRICAL PROPERTIES
OF p-TYPE Cu2O:N THIN FILMS PREPARED BY
REACTIVE DC MAGNETRON SPUTTERING
Nguyen Huu Ke1*
, Luong Xuan Toan Nguyen1, Kieu Loan Phan Thi
1,
Dao Anh Tuan1, Cao Vinh Tran
2, Le Vu Tuan Hung
1
1Department of Applied Physics, University of Science, VNU-HCM
2Laboratory of Advanced Materials, University of Science, VNU-HCM,
227 Nguyen Van Cu Street, Award 4, District 5, Ho Chi Minh City, Viet Nam
*E-mail:[email protected]
Abstract.
In this work, the structural, optical and electrical properties of absorber layers based on
nitrogen doped Cu2O (Cu2O:N) material are investigated. The Cu2O:N thin films have
been fabricated by reactive DC magnetron sputtering method. All films are p-type
semiconductor and have high absorbance in visible range. The bandgap of Cu2O:N
semiconductor are various in range of 2.1-2.4 eV. The incorporating of nitrogen impurities
in Cu2O lattice caused blue-shift of absorption band edge. The Cu2O:N thin films exhibited
the hole concentration in magnitude of 1017
cm-3
associated with low resistivity of 10 Ω.cm
which are suitable for photovoltaic applications.
Keywords: Cu2O:N thin film, P-type semiconductor, Nitrogen doping, DC magnetron
sputtering.
110
P-24
ASSESSMENT OF OIL CONTAMINATED WASTEWATER
TREATMENT BY MICROBIAL BIOFILM ATTACHED
ON COCONUT FIBER IN 2000 LITER-SYSTEM
Do Van Tuan1,2
, Le Thi Nhi Cong1,3
, Vu Ngoc Huy3,
Cung Thi Ngoc Mai3,
Hoang Phuong Ha1,3
1) Graduate University of Science & Technology, VAST, 18 Hoang Quoc Viet, Ha Noi, Viet Nam
2) Son La college, Son La, Viet Nam
3) Institute of Biotechnology, VAST, 18 Hoang Quoc Viet, Ha Noi, Viet Nam
E-mail:[email protected], [email protected]
Abstract.
Petroleum contamination poses significant health risks to humans, organisms and
environment. Many industrial processing such as oil refining, oil storage, transportation,
washing ... are making a big quantity oil contaminated wastewater in the world. Nowadays,
application of microbial biofilm to the removal of oil and its derivatives from contaminated
water and sediment was demonstrated to have good effective and friendly with ecosystem.
Microbial biofilms are defined as complex coherent structure of microorganism biomass
and cellular products, which are attached on a solid surface or an interface. In biofilm
structure, microorganisms increase their ability to grow and survive in changing
environmental conditions and increase their access to absorb substrates or nutrients. This
study focused on the degradation of hydrocarbon components contaminated in oil polluted
waste water by biofilm formed by a mixture of bacterial and yeast strains isolated from oil
contaminated water in Viet Nam attached on coconut fiber carriers in 2000 liter-system. As
the results, biofilm attached on coconut fiber could degrade 62% after 5 days and 99,9%
after 7 days of the total amount of oil with the initial concentration of 31.950 mg/l. Phenol
and polycyclic aromatic hydrocarbons (PAHs) also were degraded up to 99,9% phenol and
more than 94,8% PAHs in oily wastewater. After 7 days biological treatment, microbial
biofilm could remove 98,9% BOD5, 98,7% COD, 94,2% total nitrogen and 94,1% total
phosphore in oil polluted wastewater. This result gave hint to develop new method to treat
petroleum oil contaminated water in Vietnam.
Keywords: Biofilm, biodegradation, carrier, microorganisms, oil contaminated
wastewater.
111
P-25
STUDY ON STERILIZING PLANT MATERIALS AND EFFECTS
OF CYTOKININ, 2,4- D ON SHOOT FORMATION OF
“YELLOW ALDER” (TURNERA ULMIFOLIA L.)
Pham Thi Thanh Nhan*1
, Phan Thi Thuy2
1School of Biology, Thai Nguyen University of Education, Thai Nguyen city, Vietnam
2Master student K24, School of Biology, Thai Nguyen University of Education, Thai
Nguyen city, Vietnam
*E-mail: [email protected]
Abstract.
“Yellow alder” (Turnera ulmifolia L.) is well- known for a popular medical plant in the
Americas with the uses to enhance reproductive health, treat premature ejaculation and
impotence in men. Arbutin in it has an effect on whitening our skin naturally due to the
ability to inhibit enzymes, which produce melanin without harm side- effects, prevent anti-
aging and free radicals, tighten and smoothen skin. The extracted solution from leaves
stimulates the activity of antioxidant enzymes (glutathione peroxidase, superoxide
dismutase and catalase). This paper presents the results of studying on sterilizing plant
materials and effects of cytokinin and 2,4-D on shoot formation of T.ulmifolia from
Americas in order to find a multiplication process to develop this plant in Vietnam.
The suitable formula for rapid shoot organogenesis from segments of the trunk is the basal
MS medium supplemented with 3% sucrose, 0.8% agar, 1% activated carbon and 1,0 mg/l
BAP (1.46 shoots/material). The suitable medium for callus formation in trunk is the basal
MS medium supplemented with 1,0 mg/l 2,4- D. The basal MS medium supplemented with
2,0 mg/l BAP is good for shoot formation from callus (3,031 shoots/material).
Keywords:BAP, callus, Turnera ulmifolia L., kinetin, shoot formation
112
P-26
METABOLITES WITH ANTIMICROBIAL ACTIVITY FROM
MARINE FUNGUS ASPERGILLUS FLOCCULOSUS ISOLATED
IN NHA TRANG BAY, VIETNAM
Phan Thi Hoai Trinh1,2
, Ngo Thi Duy Ngoc1, Vo Thi Dieu Trang
1, Phi Quyet Tien
2,3,
Bui Minh Ly1,2
, Tran Thi Thanh Van1,2
1)Nhatrang Institute of Technology Research and Application,
Vietnam Academy of Science and Technology, 02 Hung Vuong, Nha Trang, Khanh Hoa
2) Graduate University of Science and Technology,
Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi
3) Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet,
Cau Giay, Ha Noi
E-mail: [email protected]
Abstract.
Marine fungi have been known for their ability to produce diverse bioactive molecules and
potential source for drug discovery research [1]. In this study, three compounds including
asteltoxin (1) [2], asterriquinone C1 (2) [3] and cycloechinulin (3) [4] were obtained from
marine-derived fungus Aspergillus flocculosus 01NT.1.1.5, isolated from sponge Stylissa
sp. at Nha Trang Bay, Vietnam (Figure 1). The structures of the compounds were
determined by the extensive 1D- and 2D-NMR spectra and mass spectroscopic data.
Compounds 1-3 showed activity against Pseudomonas aeruginosa ATCC 27853with
minimum inhibitory concentration (MIC) value of 32 μg/mL but inactive against
Staphylococcus aureus ATCC 25923. Moreover, compounds 1 and 2 were found to be
active against Bacillus cereusATCC 11778and Streptococcus faecalis ATCC 19433with
MIC values of 64 and 32 μg/mL, respectively. These compounds also exhibited
antimicrobial activity against Candida albicans ATCC 10231 with MIC values ranging
from 32 to 64 μg/mL, which was more potent than amoxicillin and cefotaxime (MIC>256
μg/mL), antimicrobial drugs as positive references. The remaining fractions and other
bioactivities of these compounds are continuing research.
Asteltoxin (1) Asterriquinone
C1 (2)
Cycloechinulin (3)
Fig. 1.Structure of compounds 1-3.
REFERENCES
[1] J.W. Blunt, et al, Nat. Prod. Rep.31, 2014, pp. 160-258.
[2] Y.Q. Tian, et al, Molecules. 2016, doi: 10.3390/molecules21010034.
[3] E.M.W. Kithsiri, et al, J. Nat. Prod. 66, 2003, pp. 1567-1573.
[4] F.S. De Guzman, et al, J. Nat. Prod.55, 1992, pp. 931-939.
113
P-27
TRANSFORMATION ZMDREB2.7 GENE ISOLATED FROM LOCAL
MAIZE VARIETY – TE VANG 1 INTO NICOTIANA TABACUM
Huynh Thi Thu Hue, Nguyen Thuy Linh, Luu Han Ly, Pham Thi Hang,
Nguyen Hai Ha, Ha Hong Hanh, Le Thi Thu Hien, Nong Van Hai
Institue of Genome Research, Vietnam Academy of Science and Technology
E-mail:[email protected]
Abstract.
Maize (Zea mays L.) is one of the most planted crops world-wide and is also one of key
cereal sources for human food and animal feed. However, maize and other crops have
faced increasing drought recently. This situation requires many researchs in genes related
in plant drought tolerance through biotechnology. The AP2/ERF family is a large family of
plant specific transcription factors that induce abiotic stress-responsive genes. Among
subfamilies of AP2/ERF, many stress-inducible DREB subfamily members have been
isolated and characterised in several studies about transgenic drought tolerant crops. With
the completion of the sequencing of the maize B73 genome, a genome-wide analysis of
maize DREB genes was made and reported that different ZmDREB genes exhibited
variable expression levels in different tissue and developmental stages, as well as in
respone to dehydrated stress. Previous study have shown that ZmDREB2.7 was a potential
transcription factor that exhibited high transactivation activity, improved drought stress
tolerance in transgenic plants without effected plant growth and development. Therefore,
we isolated ZmDREB2.7 gene from local maize variety - Te vang 1, which has good
drought tolerance. Then, ZmDREB2.7 gene was inserted into plant expression vector
driven by inducible RD29A promoter and introduced into tobacco Nicotiana tabacum
K326 by leaf disc transformation. By using PCR for 15 random transgenic plants, we
obtained 10 plants carrying ZmDREB2.7 transgene and 4 out of these had ZmDREB2.7
transcripts as a result of RT-PCR. This result showed that the vector containing
ZmDREB2.7 genefunctioned in the model plantand can be used to transfer into other crops
in order to improve dought resistance using plant transformation.
Keywords:dought tolerance, maize, Nicotiana tabacum, transformation, ZmDREB2.7
gene.
114
P-28
AGROBACTERIUM –MEDIATED SOYBEAN TRANSFORMATION
WITH GENE RELATED TO DROUGHT TOLERANCE
Lo Thanh Son1, Nguyen Thi Ngoc Lan
2, Vu Thi Thu Thuy
2,
Nguyen Thi Hai Yen3, Chu Hoang Mau
2*
1 Tay Bac University, Quyet Tam Ward, Sơn La city, Vietnam;
2 Thai Nguyen University of Education, 20 Luong Ngoc Quyen Road, Thai Nguyen city, Vietnam
3 Thai Nguyen University of Sciences, Tan Thinh Ward, Thai Nguyen city, Vietnam
*E-mail: [email protected]
Abstract.
The genes related to drought tolerance of soybean plants are divided into two groups,
regulatory genes, such as genes encoding transcription factors DREBs, NACs....and
functional genes, such as related expansin genes to the development of roots, P5CS gene
involved in synthesizing prolin… Expansin 1 (EXP1) has the ability to loosen plant cell
walls and root elongation, thus EXP1 plays an important role in the development and
growth of soybean root system. When soybean plants are impacted by prolonged drought,
they will response positively to drought stress by overexpression of EXP1 protein, thus
drought tolerance of soybean plants will be enhanced. In this work, we present results of
transformation and overexpression of GmEXP1 gene in soybean plants. The results showed
that the pCB301_GmEXP1 vector was transformed into soybean via A. tumefaciens, and
then there were nine transgenic soybean plants which survived in the greenhouse from 380
transformed leaf explants. Among nine transgenic soybean plants in generation T0, two
transgenic soybean plants were positive to PCR and one transgenic line, DT04, expresses
EXP1 recombinant protein. We will further evaluate drought-tolerance ability of DT04
transgenic soybean line through analyzing the development of the roots of transgenic
soybean plants compared with non-transgenic control plants.
Keywods:Agrobacterium-mediated transformation, expansin 1, GmEXP1 gene, loosen cell
wall, root elongation, transgenic soybean.
D
A
E
B
Fig. 1. Genetic transformation and regeneration of
transgenic soybean plants Fig. 2. A-GmEXP1 gene presence in T0
transgenic soybean plants. B-Western blot
for recombinant expansin protein in
transgenic soybean plants T0.
115
REFERENCES
[1] Lee DK, Ahn JH, Song SK, Choi YD, Lee JS. Plant Physiol131, 2003, 985 - 997.
[2] Olhoft PM, Donovan CM, Somers DA. Methods Mol Biol343, 2006,385 – 396.
[3] Zhou J, Xie J, Liao H, Wang X. Physiol Plant150, 2014, 194 – 204.
[4] Zhu Y, Wu N, Song W, Yin G, Qin Y, Yan Y, Hu Y. BMC Plant Biol 14, 2014, 93.
116
P-29
IDENTIFICATION OF PARIS SPECIES FROM SAPA AND
PULUONG IN VIET NAM USING DNA BARCODES
Vu Thi Thu Thuy, Nguyen Thi Ngoc Lan, Hoang Phu Hiep, Tran Thi Hong,
Nguyen Thi Thu Nga, Sy Danh Thuong, Nguyen Huu Quan, Chu Hoang Mau*
Thai Nguyen University of Education; 20 Luong Ngoc Quyen Road, Thai Nguyen city, Vietnam
*E-mail.: [email protected]
Abstract.
Paris species which has been included in the Pharmacopoeia is famous for its medicinal
value. There are eight Paris species found in many provinces of Vietnam such as Laocai,
Hagiang, Ninhbinh, Thainguyen, Langson, Hoabinh, Thanhhoa... The status of these
species has been at the R (race) level and inaccurate identification of these species could
lead to confound their effective conservation. Therefore, study on identification of Paris
species in Vietnam to contribute to preservation and development of the genetic resources
for Paris plants in Vietnam. In this work, we present the results of identification of Paris
samples collected in Sapa, Laocai province and Puluong, Thanhhoa province, Viet Nam.
On morphology, the Paris samples have from 4 to 6 leaves per each tree, so it is difficult to
distinguish and identify species of Paris samples. However, application of DNA barcodes
using ITS region and matK gene have identified Paris samples from Sapa, Laocai province
and Puluong, Thanhhoa province the same species as Paris vietnamesis.
Keywords: DNA barcode, medicinal plants, ITS, matK, Paris vietnamesis.
A B C D
E F G H
A B C
D E F
Fig.1.Paris plants (A, B); stems, roots, tubers of it (C-H) collected at Puluong nature reserve, Thanhhoa province and Hoanglien National Park, Sapa, Laocai province, Vietnam
Fig.2.Flowers, fruit and seeds of Paris plants. A: The tree with a flower; B: flower buds; C: petals, stamens and pistils; D: fruit ; E: ripe fruit; F: grain
1 2 3 4 M
0,5 kb0,75 kb
A
0,75 kb
1,0 kb
M 1 2 3 4
B
Fig.3. Result of electrophoresis PCR
products to test ITS region (A) and
matK gene (B). M: 1.0 kb DNA
marker; 1, 2: Paris samples
collected in Sapa, Laocai province;
and 3, 4: Paris samples collected in
Puluong, Thanhhoa province
117
REFERENCES
[1] Hebert P.D.N., Ratnasingham S., deWaard J.R. Proc. Biol. Sci.,270, 2003, 313-321.
[2] Huang Y., Li X., Yang Z., Yang C., Yang J.and Ji Y. Front Plant Sci. 7, 2016, 1797.
[3] Huang Y., Li X., Yang Z., Yang C., Yang J. and JiY. GenBank: KX784050.1; 2017
[4] Song Y., Wang S., Ding Y.,Xu J., Li M.F., Zhu S., and Chen N. Sci Rep. 7, 2017, 3427.
118
P-30
PURIFICATION AND PROPERTIES OF
PROTEASE FROM LECANICILLIUM LECANII
Nguyen Huu Quan*, Chu Hoang Mau, Tu Quang Tan
Thai Nguyen University of Education, 20 Luong Ngoc Quyen road, Thai Nguyen city, Vietnam
*E-mail: [email protected]; [email protected]
Abstract.
Lecanicillium lecanii is an entomopathogenic fungus with commercial potential for the
biocontrol of aphids and cyst nematodes. Protease is a factor supports the process of killing
insects by L. lecanii.Protease is enzyme catalyzing the hydrolysis of peptide bonds in
molecule proteins into smaller peptides and amino acids. Protease had wide applications in
many industries such as food processing, textiles, and detergents manufacturing. In this
study, an extracellular protease from L. lecanii strain 43H was purified by ammonium
sulfate precipitation and throughout Sephadex G100 gel filtration chromatography; it
showed a molecular mass of approximately 40 kDa with a specific activity of 78.73 U/mg
protein, and the purification factor of 2.3 with a yield of 17%. Optimum temperature and
pH were observed at 40°C and pH 6.0, respectively.
Keywords:Characterization, Lecanicillium lecanii, protease, purification.
119
P-31
ISOLATION AND CHARACTERIZATION OF ENDOPHYTIC
ACTINOBACTERIA FROM CINNAMOMUM CASSIA PRESL
IN VIETNAM
Vu Thi Hanh Nguyen1, Chu Ky Son
2, Nguyen Quang Huy
3, Phi Quyet Tien
1*
1 Institute of Biotechnology, Vietnam Academy of Science and Technology
2 School of Biotechnology and Food Technology, Hanoi University of Science and Technology
3University of Science and Technology of Hanoi
*E-mail: [email protected]
Abstract.
Endophytic actinobacteria in medicinal plants have proved as a natural source of valuable
bioactive compounds that can be applied in medical, pharmaceutical, agricultural and other
industries. Nevertheless, the characterization and diversity of endophytic actinobacteria
associated with medicinal plants in Vietnam is little known. This study aimed to evaluate
the diversity and the potential to synthesize bioactive compounds of endophytic
actinobacteria isolated from Cinnamomum cassia Presl in Laichau, Vietnam. A total of 69
endophytic actinobacteria were obtained in which isolates were most frequently recovered
from roots (35, 50.7%), followed by stems (21, 30.4%) and leaves (13, 18.84%). Fourteen
out of 69 isolates were evaluated for antimicrobial activity and all of them showed
inhibitory activity against to at least one of the 9 tested human pathogens. By analyzing
16S rRNA gene sequencing, these isolates belonged to genera Streptomyces,
Micromonospora, Microbacteriumand Saccharothrix. The amplification of biosynthetic
genes revealed polyketide synthases type I and type II (14.3% and 92.9%, respectively),
and nonribosomal peptide synthetases (64.3%). Our results indicate that these isolates have
a broad-spectrum antimicrobial activity and highlight the capacity of endophytic
actinobacteria in Vietnamese medicinal plants with novel antimicrobial compounds.
Keywords:Antimicrobial activity, cinnamon plant, endophytic actinobacteria, polyketide
synthases, nonribosomal peptide synthetases.
120
P-32
IN VITRO ANTI-PLATELET AGGREGATION ACTIVITY
OF DIFFERENT FRACTIONS OF CANNA EDULIS KER
Le Hong Luyen1, Nguyen Thi Van Anh
1, Vu Thi Thom
2, Duong Thi Ly Huong
2
1Department of Pharmacological, Medical and Agronomical Biotechnology; University of
Science and Technology of Hanoi; 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
2School of Medicine and Pharmacy; Vietnam National University; 144 Xuan Thuy, Cau
Giay, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
Canna edulis Ker of the family Cannaceae is grown in all parts of Vietnam, especially in
the northern limestone mountains such as Hà Giang, Cao Bằng, Bắc Kan, Thái Nguyên and
L ng Sơn. According to Hoang Sam et al. [1], Canna edulis Ker has been used in
supporting the treatment of heart failure, hypertension, and myocardial ischemia. However,
the main bioactive molecules and the mechanism of action of this plant remain unclear.
The study aims to investigate the in vitro anti-platelet aggregation activity of different
fractions of Canna edulis Ker.
Plant samples were dried and macerated 3 times with ethanol 95o at room temperature. The
crude extract was then continuously distributed with increasing polarity solvents in order to
obtain 4 different fractions including n-hexane (HX), dichloromethane (DM), ethyl acetate
(EA) and water (WT). The in vitro ADP-induced anti-platelet aggregation activity of more
polar fractions including EA and WTextracts at 2, 4 and 8 mg/ml in DMSO was studied.
Platelet aggregation was evaluated using the turbidity measurement based on the Chrono-
log Corporation process [2]. The study was conducted on platelets harvested fromhealthy
volunteers, after obtaining written informed consent.
The results showed that the EA extract of plant leaves expressed the strongest anti-platelet
activity with the percentage of ADP-induced platelet aggregation of 37%, 4% and 1% at a
dose of 2, 4 and 8 mg/ml, respectively. The EA extract of Canna edulis Ker‟s roots
exhibited lower effect with 64%, 49% and 16% of platelet aggregation at the concentration
of 2, 4 and 8 mg/ml, respectively. Unfortunately, WT extracts of both leaves and roots
showed very poor effect against platelet aggregation.
EA extracts of leaves and roots of Canna edulis Ker could be beneficial and used for
preventing cardiovascular diseases. Further studies on chemical constituents isolated from
this plant might contribute to the development of new agents inhibiting platelet aggregation
in the treatment of thrombosis.
REFERENCES
[1] Hoàng Sầm. Đề tài nghiên cứu khoa học trọng i m c p bộ, 2006.
[2] E. A. Kosea, et al. Revista Brasileira de Anestesiologia, 63(5), 2013, pp. 415-418.
121
P-33
PHENOL DEGRADATION OF SEVERAL BIOFILM-FORMING
PHOTOSYNTHETIC PURPLE BACTERIAL STRAINS ISOLATED
IN VIETNAM
Le Thi Nhi Cong*1,2
, Nguyen Thi Minh Nguyet2,3
, Do Thi Lien1,
Vu Ngoc Huy1, Nguyen Binh Hieu
4, Dong Văn Quyen
1,2
1Institute of Biotechnology, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi
2Graduate University of Science and Technology,VAST, 18 Hoang Quoc Viet, Cau Giay,
Hanoi
3Hanoi Pedagogical University 2, Xuan Hoa, Phuc Yen, Vinh Phuc
4Vietnam Institute of Dietary Supplements, 80 Tran Thai Tong, Hanoi
*E-mail:[email protected] or [email protected]
Abstract.
Phenol is one of the most aromatic toxic compounds, which means that it constitutes a
threat when released to the environment. Phenol is highly toxic even at low concentration
and is considered as one of the most dangerous contaminants in nature. Exposure to phenol
may affect mucous membrane, respiratory tract or leads to disorder of central nervous
system, and myocardial depression. Due to its high toxicity and harmful effect that phenol
causes to human and environment, it is important to find an effective way in which phenol
is safely removed from the environment. Among methods to remove phenol,
biodegradation by using biofilm formed by microorganisms is considered as low cost, high
effective and friendly to environmental approach. Recently, there are a number of
publications on forming biofilm organisms. However, there are rare of papers concerning
to purple photosynthetic bacteria (PPB) which have high capacity of biofilm formation and
phenol degradation in Vietnam. It is published that biofilm forming PPB have higher
effective ability of phenol removal than other microorganisms especial in anaerobic
condition. This report was described on the first results of 8 PPB strains which could well
form biofilm and grow on phenol. As the results, the strain LCM1 degraded 92.2% phenol
with the initial concentration of 250 ppm; the strains MI1 and DG12 degraded 93.2 and
93.4% phenol with the initial concentration of 150 ppm after 7 days, respectively. These
results may give a new insight into the potential role of biofilms formed by such PPB
species in the bioremediation of phenol and other recalcitrant aromatic compounds.
Keywords:Biodegradation, biofilm, phenol, photosynthetic purple bacteria.
122
P-34
DETERMINATION THE AMMONIUM SEPARATING IN GROUND
WATER BY USING POLYURETHANE-DERIVED CARRIER
WITH MICROBIAL FILM TECHNIQUE
Ngan H.T, Khanh D.D, Ha N.T
Department of Environmental Chemistry, Institue of Chemistry,
Vietnam Academic of Science and Technology
Abstract.
Groundwater is dramatically polluted by ammonium (NH4+) in recent years, especially in
Red river delta area, in terms of both scale and degree. In southern of Hanoi, Ha Nam and
Nam Dinh district, the pollution of ammonium is relatively high level. There are many
ammonium treating methods, such as: chlorination, ion exchange, aerating and microbial…
According to aforementioned methods, microbial is proved to be one of the best methods
with ecofriendly, economical and treatment efficiency. This article targets on researching
the separating capacity of ammonium using microbial technique with polyurethane derived
carrier. In order to determine the ammonium treating efficiency, there are several factors,
such as: carrier size and dimension, the volume of carrier, ammonium concentration…
which impact to nitrification rate by 02 techniques: moving and fixed bed microbial film.
The results indicated that with moving bed microbial film technique, the best size and
dimension of carrier is 1x1x1 cm cubic, the content of carrier is of 20% in volume.
However, fixed bed microbial film technique is favored by the 2x2x2 cm cubic carrier, the
content of 50% in volume.
123
P-35
RESEARCH INTO EFFECT OF SEVERAL PHLEGMATICNESSES
ON VACCUM STABILITY OF COMPOSITION OF RDX, TNT
AND ALUMINUM BY USING THE STABIL
Nguyen Van Khuong, Ngo Van Giao, Nguyen Tran Hung, Bui Dinh Phong
Institute of Chemistry and Materials, Academy of Military Science and Technology,
17 Hoang Sam Street, Cau Giay District, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
Research, prediction of longevity of explosives is a important issue for serving on
preservation and store of products. There are many methods as DTA, TGA, evaluation of
vacuum stability - the Stabil, each of them provides data for evaluation of chemical
stability of explosives. This paper presents several researched results of effect of
phlegmaticnesses (ceresin, stearin, mixture of ceresin and stearin, mixture of ceresin and
stearic acid) on vacuum stability of composition of RDX, TNT, and aluminum by using the
Stabil.
124
P-36
SEVERAL INITIAL RESULTS OF RESEARCHING INTO
THERMOBARIC COMPOSITIONS IN VIETNAM
Tran Quang Phat, Ngo Van Giao, Ninh Duc Ha, Nguyen Khac Phuong Hoa
Institute of Chemistry and Materials, Academy of Military Science and Technology,
17 Hoang Sam Street, Cau Giay District, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
Thermobaric compositions are a hybrid explosive compositions, which are researched and
developed in the last two decades of 20 century in countries as: the Soviet Union and the
USA. Weapons have spectacular features as using this compositions. In Vietnam,
thermobaric compositions recently are researched for advantage weapons. This paper
presents several initial results of researching, manufacturing this compositions with
domestic technical and technological conditions.
REFERENCES
[1] Xiao Ling Xing, Sheng Xiang Zhao, Zhen Yu Wang, and Guang Tao Ge, Propellants,
Explosives and Pyrotechnics. 39, 2014, pp 14-17.
[2] K.K Chand, B.Hazarica, and K.Choudhury, Proccedings of Nationl Seminar. 2012, pp.51-56
[3] Lemi TṺRKER, Defence Technology, 2016, pp 1-23.
[4] A.Apparao, R.R. Samudra, R.S. Punekar, N.G. Waghmare, and S.H. Sidi, Sixth Internationnal
high energy materials conference&exhibit, 2007, pp 1-8.
125
P-37
SYNTHESIS OF REDUCED GRAPHENE OXIDE/ TiO2 (rGO/TiO2) BY
PHOTO-CATALYTIC EXPERIMENTS IN DIFFERENT SOLVENTS
Pham Hoang Tuyen, Nguyen Tuyet Phuong*
Faculty of Chemistry, University of Science – Vietnam National University Ho Chi Minh City
E-mail: [email protected]
Abstract.
Reduced graphene oxide/TiO2 (rGO/TiO2) materials were synthesized by photocatalytic
experiments of colloidal mixtures of TiO2 and graphene oxide (GO) under ultraviolet (UV,
9W) irradiation. Solvents played an important role in the reduction mechanism of GO
assisted by shining UV light with TiO2 as a photocatalyst reagent1. The work investigated
influence of different solvents e.g. water, ethanol and propanol-2, on the reduction of GO
as a function of irradiation time. Structures and morphologies of the products were then
characterized by XRD; Raman spectroscopy; SEM and TEM. The reduction of GO was
followed carefully by semi-quantitative infrared spectroscopy and electrical conductivity.
Results showed that the reduction of GO was carried out more efficiently in alcohol
solvents than in water. This can be explained by the formation of solvent radicals and
electrons irradiated TiO2.
Keywords:rGO/TiO2 materials, reduced graphene oxide, TiO2 photocatalyst.
REFERENCES
[1] Graeme Williams, Brian Seger, and Prashant V. Kamat. TiO2-Graphene Nanocomposites. UV-
Assisted Photocatalytic Reductionof Graphene Oxide, ACS Nano 2008, 2, 1487–1491.
126
P-38
VALIDATION OF ELISA IN DETERMINATION OF
URINE COTININE AS BIOMARKER FOR
SECONDHAND SMOKE EXPOSURE
R Isah1, DA Bruzon
2
1) Philippine Ambulatory Pediatric Association, Inc., Pasay City, Philippines
2) Institute of Chemistry, College of Science, University of the Philippines Diliman,
Quezon City 1101, Philippines
E-mail: [email protected]
Abstract.
Cotinine, a metabolite of nicotine, is used as an appropriate biological marker for
secondhand smoke (SHS) exposure because of its stability, sensitivity and specificity. Its
detection in human biological fluids had been the subject of clinical diagnostic researches
as SHS exposure is implicated as risk factor for numerous diseases. Several
chromatography-based analytical methods have been developed as described in literature,
but disadvantages include their availability, high cost and tedious sample preparation. In
this study, validation was done in the determination of cotinine in human urine via
commercially available competitive enzyme-linked immunosorbent assay (ELISA) since it
allows for rapid, multiple sample analysis and minimal sample preparation. The
mechanism involves competition between cotinine and cotinine enzyme (HRP) conjugate
to bind with the anti-cotinine antibody in the well. Urine samples were collected from 73
children (ages 0 to 14) with varying degrees of SHS exposure. Standard curves generated
were linear in the range of 1 to 100 ng/mL and correlation coefficients (r2) greater than
0.99. Limits of detection (LOD) ranged from 1 to 8.87 ng/mL using 10 µL of urine sample.
Majority (53.4%) of the children had concentrations below 10 ng/mL. Cotinine
concentrations tend to increase with the number of smokers in the household with a
Spearman correlation of 0.23 (p=0.0482). Children with no household smokers had mean
concentrations of 12.8 ng/mL (± 16.2) while those with 3-5 smokers had mean
concentrations of 38.1 ng/mL (± 56.2). Results suggest the validity of urine cotinine as
biomarker for measuring SHS exposure and ELISA as a quantitative method.
REFERENCES
[1] Benowitz, Neal L. 1996. “Cotinine as a Biomarker of Environmental Tobacco Smoke
Exposure.” Epidemiologic Reviews 18(2): 188–204.
[2] Watts, Randall R, John J Langone, George J Knight, and Joellen Lewtast. 1990. “Cotinine
Analytical Workshop Report : Consideration of Analytical Methods for Determining Cotinine In
Human Body Fluids as a Measure of Passive Exposure to Tobacco Smoke.” Environmental
Health Perspectives 84: 173–82.
[3] Lutterodt, M. C. et al. 2009. “The Number of Oogonia and Somatic Cells in the Human Female
Embryo and Fetus in Relation to Whether or Not Exposed to Maternal Cigarette Smoking.”
Human Reproduction 24(10): 2558–66.
127
P-39
PREPARATION COLLAGEN-WOUND DRESSING FROM SKIN AND
TENDON BOVINE BY RECOMBINANT COLLAGENSE FROM
LYSINIBACILLUS SPHAERICUS VN3
ạ o 1 and Nguyen P, Nhue
1
Department of Fermentation Technology, Institute of Biotechnology, Vietnam Academy of Science
and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
E-mail: [email protected]
Abstract.
Collagenases of Clostridium sp. plays an essential role for invasion step on animal and
human and used in a variety of industrial processes to create industrial applications as
cosmetic, medicine, food and detergent. In this study, we report characterization of
recombinant collagenase from Lysinibacillus sphaericus VN3 that can digested skin and
tendon of bovine to produce soluble collagen type I and II. There are many types of
research described strains of L. sphaericus as insect pathogen and without harmful to
humans and animals. Recently, we determined high collagenase activity from L.
sphaericus VN3. Moreover, completed genome sequences of L. sphaericus C3-41
(NC_010382.1) could identify the existence of collagenase gene. Gene col 3.2 kb encoded
collagenase was amplified, digested and ligated target vector pRFS-Duet1. pRFS::col
transformed into E. coli BL21(DE3). 12.5 Purified collagenase (12.5 U/ml) can digest
small species skin and tandem of bovine (0.1 g/ml) into 1-1.2µm collagen fragment after
steering 48 h at 30°C with 0.02 M sodium phosphate buffer pH 7. Sterilized collagen
soluble fraction used for making collagen-wound dressing with and without antibiotic that
treatment for thermal injury model in the rabbit body. Image measurements revealed that
after one week treatment with collagen wound dressing burn wound scars were 26 and 56
% smaller than the initial wound scars with and without antibiotic, respectively. These
results suggest that recombinant collagenase of L. sphaericus VN3 is a new approach to
produce medical grade collagen biomaterials.
Keywords:Bacterial collagenase, Lysinibacillus sphaericus.
128
P-40
BIOLOGICAL CHARACTERISTICS AND BIOSYNTHESIS OF
EXOPOLYSACCHARIDES (EPS) FROM CORDYCEPS MILITARIS
FNA5 USING SUBMERGED FERMENTATION
Pham Thanh Huyen, Nguyen Duc Thang, Nguyen Van The, Nguyen Phuong Nhue,
Dang Thi Thuy Duong, Hoang Thi Yen, Bui Van Ngoc, Phi Quyet Tien*
Institute of Biotechnology, Vietnam Academy of Science and Technology,
18 Hoang Quoc Viet, Cau Giay
E-mail:[email protected], Cell phone: 0976860676, Fax: (04) 38363144
Abstract.
Cordyceps militaris, a medicinal mushroom, is one of the well-known insect fungi that
contain many bioactive compounds such as polysaccharides, cordycepin, adenosine, etc.
These compounds show remarkable biological activities, for example, antitumor,
immunomodulating, antioxidant, and pro-sexual agent.
Thus, the aim of this work is to characterize and optimize the biosynthesis of
exopolysaccharides from C. militaris FNA5 strain using submerged fermentation. The
strain FNA5 was isolated in the Pu Mat National Park, Nghe An province. Then, ITS
region of the strain FNA5 was PCR amplified and used as a molecular marker for
identification of fungal species. The output showed that this strain belongs to the genus
Cordyceps militaris. The optimal physical and nutritional conditions for production of
exopolysaccharides were investigated by individually varying one variable at a time. The
suitable physical conditions were determined as follows: pH 6, temperature 25o
C, rate of
inoculum 3% (v/v), inoculum age 84h, incubation time 15 days. The optimal medium
proportion was 3% glucose, 1% peptone, 0.05 % K2HPO4, 0.07 % KH2PO4, and 0.05%
MgSO4.7H2O. At such conditions the maximum yield of exopolysaccharides (EPS) was
achieved as 2031.2 mg/L. These fingdings indicated that newly developed medium could
be used in the industrial production of EPS and other bioactive substances from the FNA5
strain contributing to promote public health in Vietnam.
Keywords: Cordyceps, Cordyceps militaris,exopolysaccharides, ITS region, submerged
fermentation.
129
P-41
CURRENT PHYSICAL AND CHEMICAL OCEANOGRAPHIC
PROPERTIES OF THE BOLINAO CHANNEL
Narvarte, B.C.,Bangot C.G., Bautista, D., Decapia, R., Dumalagan, E., Lim, R.T.,
Purganan, D.J
Marine Science Institute, University of the Philippines, Diliman 1101,Quezon City, Philippines
E-mail: [email protected]
Abstract.
The occurrence of fish kills and massive algal blooms serves as the reason why the
properties of an oceanographic setting should be monitored. Monitoring can help avoid
these destructive events. On March 10, 2017, the different physical and chemical
oceanographic parameters of Bolinao channel were evaluated using ADCP (Acoustic
Doppler Current Profiler) and CTD (Conductivity, Temperature and Depth). Bolinao
channel is an embayment in the Province of Pangasinan, Philippines at about 250 km north
of Metro Manila and is bounded by Lingayen Gulf in the western side and west Philippine
Sea in the north eastern side [1]. Several transects were made and nine stations were
monitored by deploying CTD. Data from ADCP showed that the current flows towards the
inner part of the channel. Also, the velocity of the surface current was slower compared to
the deeper currents. Data from CTD measurements showed that temperature is around 27.4
to 28.2 0C, salinity is 33.5 to 33.7 PSU, density is 1021.3 to 1021.6 kg/m
3, chlorophyll
concentration is 0.35 to 0.70 mg/m3, dissolved oxygen is 2.9 to 5.7 mg/L. All these values
signify that the Bolinao channel is in good condition to sustain aquatic life and to avoid
algal blooms.
REFERENCES
[1] San Diego-McGlone, M. L., Azanza, R. V., Villanoy, C. L., Jacinto, G. S., 2008.
Eutrophic water algal bloom and fish kills in fish farming areas in Bolinao, Pangasinan,
Philippines. Marine Pollution Bulletin 57 295-301.
130
P-42
SYNTHESIS AND CHARACTERISTICS OF THE NITRATE
CELLULOSES FROM ACACIA CELLULOSE
Khai Minh Doan1, Nhan Duc Phan
1, Hoanh Dac Trinh
2
1 Le Quy Don Technical University
2 Institute of Military Science and Technology
Abstract.
Acacia pulp is a useful and popular material in tropics. It has been widely used for
manufacturing papers. Cellulose with high alpha-cellulose (above 92%) from acacia pulps
is able to be utilized for preparing derivatives of cellulose. Nitrate cellulose (NC), which is
a derivative of cellulose, is applied for lacquers, vanishes, propellants, etc. The synthesis
and quality of NC significantly depend on type of cellulose including its structure. In this
paper, some NCs from acacia cellulose were prepared by nitrating with nitric acid in
presence of sulfuric acid and water. The FTIR spectra and XRD spectra of the NCs were
examined. The technical characteristics of the NCs were determined such as the content of
nitrogen, viscosity in acetone, thermal stability, dissolubility in organic solvents. The
fraction of molecular weight and nitrogen content of the NCs were considered. The results
show that the NCs from acacia cellulose with low content of nitrogen (NC-2) have the
similar characteristics to those of NC from softwood cellulose. However, the NC from
acacia cellulose with high content of nitrogen (NC-1) only reaches 13.22%N as a limited
content of nitrogen. The nitrogen content of this NC is moderately lower than that of NC
from softwood cellulose (13.38%) in the same conditions of reaction. The fraction of
molecular weight focuses on in the range from … to … for NC-1 and in the range from …
to … for NC-2. The fraction of molecular weight and content of nitrogen of this NC are
more diffractive than that of NC from softwood cellulose.
REFERENCES
[1] T. Urbanski - Chemistry and Technology of Explosives Vol. II, Polish Scientific Publishers,
Warszawa 1965.
[2] H. S. Munro and R. D. Short – A study of low temperature nitration of cellulose in mixed acids,
Journal of Applied Polymer Science, Vol. 39, 539-551, 1990.
[3] Siochi E. J., Ward T. C., Absolute molecular weight distribution of nitrocellulose, JMS. REV.
Macromol. Chem. Phys., C29(4), 561-657, 1989.
[4] Saunders C. W., Taylor L. T., A review of synthesis, chemistry, analysis of nitrocellulose,
Journal Energetic Materials, 2006, DOI: 10.1080/07370659008012572.
[5] Dong-Ping Sun, Bo Ma, Chun-Lin Zhu, Chang-Sheng Liu and Jia-Shi Yang, Novel
nitrocellulose made from bacterial cellulose, Journal of Energetic Materials, 28: 85–97, 2010.
[6] Ting Kai Wu, Carbon-13 and Proton Nuclear Magnetic Resonance Studies of Cellulose
Nitrates, Macromolecules13, 74-79, 1980.
131
P-43
SYNTHESIS AND SOME CHARACTERISTICS OF
THE NITRATE CELLULOSES FROM ACACIA CELLULOSE
Khai Minh Doan1, Nhan Duc Phan
1, Hoanh Dac Trinh
2
1 Le Quy Don Technical Universty, 236 – Hoang Quoc Viet - Hanoi
2 Institute of Military Science and Technology, 17 – Hoang Sam – Cau Giay - Hanoi
E-mail: [email protected]
Abstract.
Acacia pulp is a useful and popular material in tropics. It has been widely used for
manufacturing papers. Cellulose with high alpha-cellulose (above 92%) from acacia pulps
is able to be utilized for preparing derivatives of cellulose. Nitrate cellulose (NC), which is
a derivative of cellulose, is applied for lacquers, vanishes, propellants, etc. The synthesis
and quality of NC significantly depend on type of cellulose including its structure. In this
paper, some NCs from acacia cellulose were prepared by nitrating with nitric acid in
presence of sulfuric acid and water. The FTIR spectra and XRD spectra of the NCs were
examined. The technical characteristics of the NCs were determined such as the content of
nitrogen, viscosity in acetone, thermal stability, dissolubility in organic solvents. The
fraction of molecular weight and nitrogen content of the NCs were considered. The results
show that a NC from acacia cellulose with low content of nitrogen (NC-2) have the similar
characteristics to those of NC from softwood cellulose. However, a NC from acacia
cellulose with high content of nitrogen (NC-1) reaches 13.22%N as a limited content of
nitrogen. The nitrogen content of this NC is moderately lower than that of NC from
softwood cellulose (13.38%) in the same conditions of reaction. The fraction of molecular
weight focuses on in the range from 30,000 to 130,000 for NC-1 and in the range from
9,500 to 91,000 for NC-2. The distribution of nitrogen content of those NCs is larger than
that of NCs from softwood cellulose.
Keywords:acacia cellulose, cellulose nitrate, technical characteristics, fraction.
REFERENCES
[1] T. Urbanski, Chemistry and Technology of Explosives Vol. II, Polish Scientific Publishers,
Warszawa 1965.
[2] H. S. Munro and R. D. Short, A study of low temperature nitration of cellulose in mixed acids,
Journal of Applied Polymer Science, Vol. 39, 539-551, 1990.
[3] Siochi E. J., Ward T. C., Absolute molecular weight distribution of nitrocellulose, JMS. REV.
Macromol. Chem. Phys., C 29(4), 561-657, 1989.
[4] Saunders C. W., Taylor L. T., A review of synthesis, chemistry, analysis of nitrocellulose,
Journal Energetic Materials, 2006, DOI: 10.1080/07370659008012572.
[5] Dong-Ping Sun, Bo Ma, Chun-Lin Zhu, Chang-Sheng Liu and Jia-Shi Yang, Novel
nitrocellulose made from bacterial cellulose, Journal of Energetic Materials 28, 85–97, 2010.
[6] Ting Kai Wu, Carbon-13 and Proton Nuclear Magnetic Resonance Studies of Cellulose
Nitrates, Macromolecules 13, 74-79, 1980.
[7] Jolanta Liesiene, Jurgita Kazlauske, Functionalization of cellulose: Synthesis of water-soluble
cationic cellulose derivatives, Cellulose Chem. Technol., 47 (7-8), 515-525, 2013.
132
P-44
RESEARCH INTO EFFECT OF PHLEGMATICNESS,
TEMPERATURE AND CONCENTRATION OF
PHLEGMATICNESS ON DISTRIBUTIVE AREA OF
THIS SUBSTANCE IN ONE-BASE PROPELLANT
Pham Quang Hieu1, Pham Van Toai
1, Chu Chien Huu
2
1Institure of Propellants and Explosives, 192 Duc Giang Str, Long Bien District, Hanoi, Vietnam
2Institute of Chemistry and Materials, 17 Hoang Sam Street, Cau Giay District, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
One-base propellant is a kind of colloidial structure based on nitrocellulose and is plastic
by volatile solvent as etanol and ether ethylic. Phlegmatic propellant is a special one in
group of one-base propellant and normally is used for charge of weapon with long barrel,
high power. This paper presents process of manufacturing phlegmatic propellant, research
into effect of phlegmaticness, temperature and concentration of phlegmaticness on
distributive area of this substance in one-base propellant.
133
P-45
DEVELOPMENT OF GOLD NANOPARTICLES MODIFIED
SCREEN-PRINTED CARBON ELECTRODE FOR LABELL FREE
IMPEDIMETRIC BIOSENSOR APPLICATIONS
TruongTN Lien
School of Engineering Physics, Hanoi University of Science and Technology, No 1 Dai Co Viet,
Hai Ba Trung, Hanoi, Vietnam
E-mail: [email protected]; [email protected]
Abstract.
In this review of my research, development of gold nanoparticles (AuNPs) modified
screen-printed carbon electrode for labelless impedimetric biosensor applications is
presented. Through specific examples, we describe the fabrication and surface modification
of AuNPs-modified printed electrodes for sensitive and selective detection of cancer
biomarkers as well as the precise quantification of a small molecule by using
electrochemical impedance spectroscopy (EIS) method. We have developed a relatively
sensitive quantitative EIS immunosensor for amyloid beta [1]. Three types of amyloid beta
impedimetric immunosensors were fabricated in a step-wise manner in order to understand
the effects that each surface modification chemistry had on detection sensitivity. We found
that immobilization of AuNPs, to improve stability of the recognition element and also
increase the surface area for immobilization, lowered the LOD by both ~ three orders of
magnitude. In the case of aptamer sensor, AuNPs-modified electrode could help to avoid
the effect of steric hindrance and the formation of intermediate states [2]. As we all know
that three main binding states, known as „„charge screening‟‟, „„soft complex‟‟ and „„stable
complex” can form between antigen and their. When aptamers are placed too close
together, they will sterically hinder each other, preventing antigen binding. For molecularly
imprinted polymer (MIP)-based sensor [3], MIP films were composed of compact spheres
when grown on method electrodes, while it was possible to grow more homogenous thin
MIP films on screen-printed carbon electrodes that were functionalized with gold
nanoparticles.
REFERENCES
[1] Truong T Lien, Yuzuru Takamura, Eiichi Tamiya and Mun'delanji Catherine Vestergaard,
Analytica Chimica Acta. 892, 2015, pp 69-76.
[2] Tram T. N. Do, Toan Van Phi, Tin Phan Nguy, Patrick Wagner, Kasper Eersels, Mun‟delanji C.
Vestergaard, and Lien T. N. Truong, Journal of Electronic Materials, 46 (6), 2017, pp 3542-
3552.
[3] Tin Phan Nguy, Toan Van Phi, Do T. N. Tram, Kasper Eersels, Patrick Wagner and Truong T.
N. Lien, Sensors and Actuators B 246, 2017, pp 461–470.
134
P-46
DEVELOPMENT OF CENTRIFUGAL MICROFLUIDIC
TECHNOLOGY FOR ULTRA LOW-VOLUME QCM
-BASED BIOSENSING SYSTEM
Phi Van Toan1, Yoshiaki Ukita
2 and Truong TN Lien
1*
1) School of Engineering Physics, Hanoi University of Science and Technology (HUST), Vietnam
2) Department of Interdisciplinary Research, Graduate School of University of Yamanashi, Japan
E-mail: [email protected]; [email protected]
Abstract.
Microfluidic is the science of manipulating and controlling fluid flows, usually in the range
of microliters to picoliters, in networks of channels with dimensions from tens to hundreds
of micrometers. This technology is used in many fields such as engineering, physics,
chemistry, biochemistry and nanotechnology in order to make the miniaturization and
automation systems that improve the precision of experiments, lowering limits of detection
and running multiple analyses simultaneously. In biosensor applications, microfluidic chip
is integrated to the current system to control the fluid flow to introduce reagent solution
into reaction chamber through micro pumps or micro valves. However, the connecting
tubes always contain an amount of consumption solution. This is a limitation of traditional
microfluidic technology combined with bio-sensing system. On the other hand, to improve
analytical performance by reducing the consumption reagents down to few of μL, reducing
the analysis time, increasing reliability and sensitivity made possible by through
automation and integrating multiple processes, such as on chip centrifugal blood separation
and washing of the sensor surface, in a single device. In this work, the centrifugal
microfluidic chip will be designed and manufactured to integrate onto QCM device for
minimization of consumption reagent used in sensor fabrication and to establish the
automation process for artificial bioreceptors MIP immobilization onto working
electrode.The results show that the reagent consumption decreases dramatically from
hundreds of microliters to dozens of microliters. Centrifugal microfluidic chips (it can be
seen in Fig. 1) has unique strong advantage against conventional flow cell and even against
other existing microfluidic devices.
Fig 1. Siphon type of centrifugal microfluidic chip that is integrated onto QCM device.
135
P-47
INFLUENCE OF PERIOD ON THE EXTRAORDINARY
TRANSMISSION THROUGH ARRAY OF MICROHOLES IN THIN
ALUMINUM FILM
Trang T.H. Nguyen1,4,5*
, Sergey I. Kudryashov1,2,3*
, Pavel A. Danilov1, Andrey A.
Ionin1,Roman A. Khmelnitskii
1,Andrey A. Rudenko
1, Irina N. Saraeva
1, Dmitry A.
Zayarny1
and Minh H. Pham6
1 Lebedev Physical Institute, Leninskiy prospect 53, 119991 Moscow, Russia,
2 National Research Nuclear University MEPhI (Moscow Engineering Physics Institute),
Kashirskoe shosse 31, 115409 Moscow, Russia
3 ITMO University, Kronverkskiy prospect 49, 197101 St. Peterburg, Russia, Russia
4Moscow Institute of Physics and Technology, 9 Institutskiy Pereulok, 141701 Dolgoprudny,
Moscow Region, Russia
5 Ha Tinh University, Ha Tinh, 447, 26/3 street, Dai Nai ward, Ha Tinh city, Viet Nam
6 Institute of Physics, 10 Dao Tan, Str. Ba Dinh, Hanoi, Viet Nam
*E-mail: [email protected]
Abstract.
In Fig.1 such normalized transmittance spectra are presented for aluminum Al-grating with
different periods P = 6, 7 and 8 µm. The corresponding (1,0), (1,1) and (2,0)-peaks blue-
shift monotonously versus decreasing P with their particular experimental spectral
positions in the quantitative agreement with the predicted ones, considering the metal-
dielectric (CaF2, IR dielectric constant CaF2 2 [1]), rather than metal-air (IR dielectric
constant air 1), interface of the gratings. The fixed 4-m hole diameter (perimeter,
square) is favorable for increasing amplitudes (contrast) of the (1,1)- and (2,0)-peaks at
increasing P, as the corresponding surface density of hole decreases versus P, decreasing
the surface corrugation.
Fig.1.(Online colour) Normalized transmittance
spectra of micro-hole gratings (d 4 m) on the
50-nm thick Al films on the CaF2 substrates with
the variable periods, the red numbers showing
the spectral positions of their (1,0), (1,1) and
(2,0)-peaks and the red dashed lines showing
their evolution versus P. Insets: top-view SEM
images of the gratings with the diameters (scale
bars can vary).
REFERENCES
[1] H. Malitson, Appl. Opt. 2,1963, pp. 1103-1107 .
136
P-48
CALCULATE SEDIMENT STRANPORT AND BED TOPOGRAPHY
VARIATIONS AT CU LAO DUNG (SOC TRANG PROVINCE)
BY USING DELFT 3D MODEL
Nguyen Hoang Phong, Vo Luong Hong Phuoc
Oceanology, Meterology and Hydrology Department, Faculty of Physics and Engineering Physics,
University of Science, 227 Nguyen Van Cu st., dist. 5, Ho Chi Minh city
E-mail: [email protected]
Abstract.
Cu Lao Dung is located on Hau River, between Tran De and Dinh An estuaries. The
deposition process in Cu Lao Dung is influenced by sedimentation source and sediment
transport from the two estuaries. In the period 1955-2000, Cu Lao Dung show an increase
trend of 70-80m per year. Presently, deposition process decreases in speed and scale, and
occures at the two ends of the island, which leads to a formation of a large muddy flat at
ebb tide. The modelling results show that sediment transport process changes by season,
sediment concentration is leagest in flood season. The benthic terrain deposition and
erosion process depend on season, the deposition process is dominant. Sediment from Dinh
An estuary causes deposition at the northeastern head and sediment from Tran De estuary
cause deposition at the southwest head of Cu Lao Dung.
137
P-49
GENERATION OF MAXIMALLY ENTANGLEMENT OUTPUT
STATE BY A NONLINEAR QUANTUM SCISSORS INTERACT
WITH TWO EXTERNAL FIELDS
Luong Thi Tu Oanh1, Nguyen Thi Hong Sang
1, Chu Van Lanh
1, Doan Quoc Khoa
2,*
1)Vinh University, 182 Le Duan, Vinh, Viet Nam
2)Quang Tri Teacher Training College, Quang Tri, Viet Nam
*E-mail: [email protected]
Abstract.
We study a model with two nonlinear oscillators which have different frequencies and
interact with each other by a nonlinear interaction. In order to excite the system, we use
two external fields. It follows from numerical simulation that evolution of the system is
similar to that of a combination of n-photon states. Therefore, the considered system
behaves as so-called nonlinear quantum scissor [1-3]. Nevertheless, evolution of the
system generates Bell-like states in several times with very high probability. Because of
the nonlinear properties of oscillators and their interaction, the system creates a truncation
of optical states, which leads to obtain two-qubit states. Next, we compare our results with
that achieved for systems in which interaction between oscillators is linear pumped in two
modes [1,2], and also interaction between oscillators is nonlinear pumped in one mode [3].
REFERENCES
[1] A. Miranowicz and W. Leonski, Phys. B: At. Mol. Opt. Phys.39, 2006, pp. 1683-1700.
[2] W. Leonski, Phys. Rev. A55, 1997, pp. 4250-4265.
[3] A. Kowalewska-Kudlaszyk and W. Leonski, Phy. Rev. A73, 2006, pp. 042318-042334.
138
P-50
OPTIMIZATION OF PURIFICATION OF ARTIFICIAL
HEMAGGLUTININ OF A/H5N1 VIRUS FROM PLANT
Van Thi Pham1,3
, Hoang Trong Phan1,2
, Ulrike Gresch2, Hoa Thanh Le
1,3,
Ngoc Bich Pham1,3
, Udo Conrad2, Ha Hoang Chu
1,3 and Trang Huyen Vu
1,3
1Institute of Biotechnology (IBT), Academic of Science and Technology Vietnam (VAST), Hanoi,
Vietnam.
2 Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
3 Graduate University of Science and Technology (GUST), VAST, Hanoi, Vietnam
E-mail: [email protected] or [email protected]
Abstract.
Yearly, highly pathogenic avian influenza A/H5N1 virus cause many outbreaks with
different strains in poultry in Vietnam, which poses the huge losses to the economy. The
development of universal vaccine candidates is considered the best strategy for protection
poultry resistant to many A/H5N1 strains at the same time. In this study, we designed a
artifical hemagglutinin representing to all of A/H5N1 strains clade 1 (HAc1) which
occered in poultry from 2003 until 2015 in Vietnam. So, HAc1 can be a universal vaccine
candidate. HAc1 was transiently expressed in Nicotiana benthamiana by agroinfiltration.
The purification of HAc1 protein is performed and optimized by using immobilized metal
ion affinity chromatography (IMAC) and size exclusion chromatoghraphy (SEC). Purified
HAc1 was found immunogenic in rabbit at the first injection.
139
P-51
REMOVAL OF AMOXYCILLIN IN AQUEOUS SOLUTION USING
MODIFIED ACTIVED CARBON
Ha Nguyen Nu My1, Cam Bui Duy
2, Trung Do Quang
2, Ngoc Nguyen Hong
2, Le Tong
Cam1
1Ha Tinh university, Ha Tinh
2Ha Noi university of science - Vietnam National University, Hanoi
E-mail: [email protected]
Abstract.
Antibiotics have saved millions of lives and eases the the suffering of patients of all ages
for more than 60 years; however, the rampant use in recent decades leads concerns about
antibiotic resistance [1]. The consequences of antibiotic resistance are not only increase in
sickness and deaths but also the burden of finance[2]. Some of studies have show that
concentrations of pharmaceuticals (almost antibiotics) in surface water and groundwater
are less than 0.1 μg/l [6]. There are many methods to remove antibiotics from water such
as ozonation [3], photocatalytic degradation [4] and absorption[5]. Activated carbon is
frequently applied for removing because of high surface area and inexpensive method.
The removal of amoxycillin (AMX) from aqueous solution were investigated using actived
carbon modification (ACM). The ACM were preparated by halogen - Br2 (BAC), sulfur
(SAC), hydrogen peroxide (HAC), nitric acid (NAC); and characterized by determination
of the point of zero charge, SEM spectrum, IR spectrum, BET. The resuft among the
investigated active carbon shows that SAC were the best material to remove AMX in
water. Moreover, when using 0.5 g each of AC, optimum pH is 6 for almost AC,
exceptionally NAC. The equilibium adsorption is practically achieved through a time of 90
minutes and 120 minutes for SAC and AC, respectively. The equilibrium data were in
good agreement with Langmuir model for both AC and SAC. The adsorption capacity of
AMX was significantly greater for the adsorption onto SAC than that of AC. The
adsorption capacity is 40 mg/g for SAC, while for AC is 16 mg/g. In the desorption tests of
AMX onto SAC, it is concluded that the desorption efficiency of AMX using alkaline
solution is better than using acidic solution.
REFERENCES
[1] Anthony R.M. Coates, Antibiotic resistance, Springer (2012) 10-11.
[2] A. de. J. Sosa et al, Antimicrobial Resistance in Developing Countries, Springer (2010) 22-24.
[3] Keisuke Ikehata, Naeimeh Jodeiri Naghashkar, Mohamed Gamal El-Din, Degradation of
aqueous pharmaceuticals by ozonation and advanced oxidation processes: A Review; Ozone:
Science and Engineering, 28: 353-414.
[4] Emad S. Elmolla, Malay Chaudhuri, Photocatalytic degradation of Amoxicillin, ampicillin and
cloxacillin antibiotics in aqueous solution using UV/TiO2 and UV/H2O2/TiO2 photocatalysis;
Desalination 252 (2010) 46-52.
[5] Vesna Rakic, Vladislav Rac, Maririja Krmar, Otman Otman, Aline Auroux; The adsorption of
pharmaceutically active compounds from aqueous solutions onto activated carbons; Journal of
Hazardous Materials (2014).
[6] World Health Organization, Pharmaceuticals in drinking water (2011) 1-4.
140
P-52
THE USE OF DNA BARCODING IN IDENTIFICATION OF
Sarcandra SAMPLES COLLECTED IN LANG SON, VIET NAM
Nguyen Thi Hai Yen1*
, Chu Hoang Mau2
1 Thai Nguyen University of Sciences; Tan Thinh Ward, Thai Nguyen City, Viet Nam
2Thai Nguyen University of Education; 20 Luong Ngoc Quyen Road, Thai Nguyen city, Vietnam
*E-mail.: [email protected]
Abstract.
Sarcandra glabra (Thunb.) Nakaibelongs to genus Sarcandra, the Chloranthaceae family
which is a medicinal plants that has anti-stress, antioxidant, anti-inflammatory,
detoxifying, blood activating, and anti-bacterial effects. Sarcandra glabra is an wild herb
widely distribute in VietNam, especially in the provinces, at the North of VietNam. In this
work, we present the results of identification of Sarcandra samples collected in Lang Son
province, Viet Nam using ITS barcoding marker. The Sarcandra plants has a wooden trunk
with 0.5-1.5 cm in diameter; single leaf opposite and elliptical leaf blade with 7-20 cm
long, 3-5 cm wide, dark green on the inside, lightly on the underside; double flowers, few
branches and short ones including white inflorescence rising from 3 - 8cm long flower
bracts. Sarcandra has a small, berry-like fruit, approximately 4-7 mm in diameter. From
genome of Sarcandra plants, ITS region has been isolated with 650 nucleotides in length.
The BLAST analytic result showed that the ITS region of the Sarcandra samples collected
in Lang Son province, Viet Nam is similarity to that of the ITS region of 99.7% of
Sarcandra glabra species in GenBank (GenBank: JN407442, JN407443, KC840060,
KP317601). Thus, the Sarcandra samples collected at the Lang Sơn province, Viet Nam
belongs to Sarcandra glabra species. The this result opens the direction of application of
DNA barcode to identify Sarcandra glabra plants in Vietnam. We suggest that the use of
DNA barcoding is integrated into the work flow during medicinal herb studies, as this
could significantly increase the number of identified specimens and improve knowledge
about the medicinal species distributions.
Keywords: DNA barcode, medicinal plants, ITS, Sarcandra glabra.
Fig.1.Morphology of Sarcandra Glabra (Thunb.)
Nakai (1) leaf, (2) flower buds (3) a bunch of flowers
(4) fruit (5) roots.
Fig.2. Result of electrophoresis PCR
products to ITS region. M: 1.0 kb DNA
marker; 1, Sarcandra Glabra (Thunb.)
Nakaicollected in Langson province.
141
REFERENCES
[1] Hebert P.D.N., Ratnasingham S., deWaard J.R. Proc. Biol. Sci.,270, 2003, 313-321.
[2] Chan,W.H., Li,M. and Wong,K.L. GenBank JN407442, 2011.
[3] Fang,T., Yang,J.-B. and Li,D.-Z. GenBank: KC840060; 2015.
[4] Kang,J.-S. and Yoo,K.-O.GenBank: KP317601; 2015.
142
P-53
TERAHERTZ EMISSION CHARACTERISTICS OF DOPED GaAs
AND InAs UNDER 650 mT EXTERNAL MAGNETIC FIELD
Alexander De Los Reyes*a, Lorenzo Lopez, Jr.
a, Joselito Muldera
a,
Ramon Delos Santosa, Hannah Bardolaza
b, Elizabeth Ann Prieto
a,
Armando Somintaca, Arnel Salvador
a, Masahiko Tani
c and Elmer Estacio
a
a) National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
b) Material Science and Engineering Program, University of the Philippines Diliman, Quezon City,
Philippines
c) Research Center for Development of Far-Infrared Region, University of Fukui 910-8507, Japan
E-mail: [email protected]
Abstract.
We study the effects of a 650 mT external magnetic field (B-field) on the terahertz (THz)
emission characteristics of p-GaAs, n-GaAs, p-InAs and n-InAs semiconductor wafers.
The dominant THz emission in InAs is known to be the photo-Dember effect while it is the
surface field effect in GaAs [1-3]. A mode-locked Ti:Sapphire laser with 800 nm central
wavelength, 100 fs pulse duration, and 80 MHz repetition rate was used as excitation
source. The THz emission from the samples was measured using a standard terahertz time-
domain spectroscopy setup (THz-TDS). The B-field effects on the THz-TDS waveform
polarity, amplitude, and bandwidth is discussed. Results have shown anomalous polarity
reversal and B-field enhancement preference from the samples. We explain these results in
the context of the drift-diffusion equation and the dipole reorientation model [4,7]. This
could be useful in the design and optimization of THz devices with magnetic and
optoelectronic applications.
REFERENCES
[1] Gu, Ping, Masahiko Tani, Shunsuke Kono, Kiyomi Sakai, and X-C. Zhang. "Study of terahertz
radiation from InAs and InSb." Journal of applied physics 91, no. 9 (2002): 5533-5537.
[2] Liu, Kai, Jingzhou Xu, Tao Yuan, and X-C. Zhang. "Terahertz radiation from InAs induced by
carrier diffusion and drift." Physical Review B 73, no. 15 (2006): 155330.
[3] Heyman, J. N., Coates, N., Reinhardt, A., & Strasser, G. (2003). Diffusion and drift in terahertz
emission at GaAs surfaces. Applied physics letters, 83(26), 5476-5478.
[4] Johnston, Michael B., D. M. Whittaker, A. Corchia, A. G. Davies, and Edmund H. Linfield.
"Simulation of terahertz generation at semiconductor surfaces." Physical Review B 65, no. 16
(2002): 165301.
[5] Weiss, C., R. Wallenstein, and R. Beigang. "Magnetic-field-enhanced generation of terahertz
radiation in semiconductor surfaces." Applied Physics Letters 77, no. 25 (2000): 4160-4162.
[6] Shan, J., C. Weiss, R. Wallenstein, R. Beigang, and T. F. Heinz. "Origin of magnetic field
enhancement in the generation of terahertz radiation from semiconductor surfaces." Optics
letters 26, no. 11 (2001): 849-851.
[7] Tsen, Kong-Thon, ed. Ultrafast dynamical processes in semiconductors. Vol. 92. Springer
Science & Business Media, 2004.
143
P-54
ENHANCEMENT OF VISIBLE AND TERAHERTZ EMISSION
IN NANOSTRUCTURED SILICON
Neil Irvin Cabello1, Philippe Tingzon
1 , Kerr Cervantes
1, Arven Cafe
1,
Joybelle Lopez1, Arvin Mabilangan
1, Alexander De Los Reyes
1,
Maria Angela Faustino1, Lorenzo Lopez Jr.
1, Joselito Muldera
2, Dinh Cong Nguyen
3,
Xuan Tu Nguyen3, Hong Minh Pham
3, Thanh Binh Nguyen
3, Arnel Salvador
1,
Armando Somintac1, Elmer Estacio
1
1) Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines, Diliman, Quezon City, Philippines
2) De La Salle University, De La Salle University, 2401 Taft Avenue, Manila, Philippines
3) Institute of Physics, Vietnam Academy of Science and Technology,
10 Dao Tan, Ba Dinh, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
We report on the ultrafast visible and far infrared emission properties of nanostructured
silicon (nanoSi) materials, namely porous silicon (PSi) and silicon nanowires (SiNW). The
PSi samples were fabricated using a standard lateral anodization setup [1], while the SiNW
samples were fabricated using electroless etching [2,3]. The PL observed from the nanoSi
were attributed to radiative recombination at the surface states. Ultrafast radiative lifetime
in the order of 250 picoseconds were also observed from the strongly luminescent PSi
samples. The enhanced THz emission were attributed to the increased photon absorption
and more efficient photocarrier transport. An inverse relationship between THz emission
and luminescence intensity was observed, as photocarrier transport and radiative
recombination are competing mechanisms [4]. Understanding the carrier dynamics in
nanoSi could pave way to novel and more efficient Si-based photovoltaic devices.
REFERENCES
[1] O. Bisi, S. Ossicini, L. Pavesi, Surf. Sci. Rep.28, 2000, pp. 1-126.
[2] K. Peng, Y. Yan, S. Gao, J. Zhu, Adv. Funct. Mater. 13(2), pp. 127-132.
[3] K. Peng, J. Hu, Y. Yan, Y. Wu, H. Fang, Y. Xu, S.T. Lee, J. Zhu, Adv. Funct. Mater. 16, 2006,
pp. 387-394.
[4] N. I. Cabello, P. Tingzon, K. Cervantes, A. Cafe, J. Lopez, A. Mabilangan, A. De Los Reyes, L.
Lopez Jr., J. Muldera, D. C. Nguyen, X. T. Nguyen, H. M. Pham, T. B. Nguyen, A. Salvador, A.
Somintac, E. Estacio, J. Lumin.186,2017, pp. 312-317.
144
P-55
ISOLATION AND CHARACTERIZATION OF
AN ISOLATED ENTOMOPATHOGENIC FUNGUS
IN THAI NGUYEN
Nguyen Thi Thanh Nga, Hoang Quynh Trang,
Trinh Ngoc Hoang, Nguyen Thi Kim Cuc*
Department of Biotechnology, Thai Nguyen University of Sciences,
Tan Thinh Ward, Thai Nguyen, Viet Nam
E-mail: [email protected]/[email protected]
Abstract.
Using bioinsecticides is an environmental friendly method to regulate of insect populations
in field. Microbes, especially entomopathogenic fungi widely uses to produce commercial
bioinsecticides. In this study, we reported an isolated entomopathogenic fungus from
infected Scotinophara tarsalis that effectively kills Pieris rapae andZophobas morio.
Morphological and molecular classification indicated that the isolated strain is Beauveria
bassiana named Beauveria bassiana TN1 has 98-100% homology in internal transcribed
spacer (ITS) sequence compared with the available ITS sequence in the public
database GenBank. The fungus strain grew well on temperature range from 28 to 38oC and
optimal temperature was 33oC. Interestingly, the strain still grew and kept
entomopathogenic capacity after 30 min continuously exposing UV light. Optimal
condition to produce spores was established in solid-state fermentation using 80% rice,
10% soybean grain and 10% rice hulls. The liquid bioinsecticide from Beauveria bassiana
TN1 was produced and obtained 109 spores/ml. Those result suggested that Beauveria
bassiana TN1 ispotential strain to develop an effective bioinsecticide.
Keywords: Beauveria bassiana, Bioinsecticide, entomopathogenic fungus.
Fig. 1.Pieris rapaeare killed by theBeauveria bassiana TN1.
REFERENCES
[1] A. Ritu, C. Anjali1, T. Nidhi, P. Sheetal and B. Deepak, J. Biofertil. Biopestici. 3, 2012,
pp.1.
[2] B. Avanti , K. Balaraman and R. Gopinath, Int. J. LifeSc. Bt & Pharm. Res. 3, 2014,
pp. 111.
[3] S.H. Ying and M.G. Feng, Lett. Appl. Microbiol.43, 2006, pp. 331.
145
P-56
STUDIES ON THERMAL DECOMPOSITION BEHAVIOR OF PETN
AND POLYMER-BONDED EXPLOSIVES BASED ON PETNUSING
THERMAL METHODS
Nguyen Trung Toan1, Phan Duc Nhan
1, Vo Hoang Phuong
2
1) Le Quy Don Technical University, 236, Hoang Quoc Viet, Hanoi, Vietnam
2)Institute of Military Science and Technology, 17, Hoang Sam, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
The kinetics of exothermic reactions are important in assessing the potential of materials
and systems for the thermal explosion. In this paper, the thermal behavior and
decomposition kinetics of pentaerythritol tetranitrate (PETN) and polymer-bonded
explosives (PBX) based on PETN were investigated using several thermal methods, such
as Thermogravimetric analysis (TGA), Differential Scanning Calorimetry (DSC) and
Vacuum Stability Test (VST). The Arrhenius activation energies and pre-exponential
factors were determined by the Ozawa, Flynn, and Wall (OFW) and Kissinger-Akahira-
Sunose (KAS) methods [1-4]. It was found that PBX based on PETN has a lower
activation energy than pure PETN. Based on the overall kinetic parameters of
decomposition reactions, the shelf life of PETN and PBXs based on PETN can be
calculated and predicted [2,5].
Keywords:PETN, PBX, Thermal decomposition, Kinetics, DSC, TGA, VST.
REFERENCES
[1] Ahmed Elbeih et al. Thermal behavior and decomposition kinetics of RDX and RDX/HTPB
composition using various techniques and methods.Central European Journal of Energetic
Materials.13(3), 2016, pp. 714-735.
[2] ASTM E698-11. Standard test method for Arrhenius kinetic constants for thermally unstable
materials using differential scanning calorimetry and the Flynn/Wall/Ozawa method.
[3] Craig M. Tarver and Tri D. Tran. Thermal decomposition models for HMX-based plastic
bonded explosives. Combustion and Flame, 137, 2004, pp. 50–62.
[4] Arjun Singh et al. Thermal decomposition and kinetics of plastic bonded explosives based on
mixture of HMX and TATB with polymer matrices. Defence Technology, 13, 2017, pp. 22-32.
[5] Jinn-Shing Lee and Chung-King Hsu. Thermal properties and shelf life of HMX–HTPB based
plastic-bonded explosives. Thermochimica Acta, 392–393, 2002, pp. 153–156.
146
P-57
AGROBACTERIUM – MEDIA TRANSFORMATION OF
CRY3CA1 GENE INTO KB1 SWEET POTATO
Vu Thi Lan1, Pham Bich Ngoc
2, Le Tran Binh
2
1Falcuty of Biotechnology, Thainguyen University of Science, Thainguyen University
2Institute of Biotechnology, VAST
E-mail: [email protected]
Abstract.
Sweet potato Ipomoea batatas (L.) Lam. is an important food crop in the world as well as in
Vietnam. Despiteitsmanybenefits,theproductionofsweetpotatois restricted in
manyareasoftheworldbydiseases, weed, and, particularly, pests. Asanalternative,genetic
transformationprovides
themeansforcomplementingconventionalbreedingtoimprovesweetpotato to resistant to pest. In
this study, shoot tip and leaf explants ofKB1 sweet potatovariety were
infectedwithA.tumefaciensC58/pBI101/cry3Ca1. The selection were occured oncallus
producing medium (SM) containing 0.5 g/L picloram, 100 mg/L kanamycin and 500 mg/L
cefotaxime. Survival embryogenic calli were then transferred toembryo producing medium
(EG2) supplied with 1.0 mg/L ABA and 1.0 mg/L GA3after 3 weeks. Putative transgenic
shoots regenerated on medium (RM) supplying 0.5 mg/L kinetin and 1.0 mg/L BAP were
rooted on root producing medium (RR). The tentative transgenic lines were proved positively
by PCR and finalized by Southern, and biotest in laboratory. Conclusionly,we obtained 62
tentativetransgenic sweet potato lines resistant to kanamycin. Among these lines, five putative
transgenic lines were proved positively by Southern hybridization, confirming that the
transgenic lines of KB1 cultivars obtain one copies of the cry3Ca1gene.
Keywords: Agrobacterium tumefaciens, Ipomoea batatas L., cry3Ca1 gene, plant
transformation, sweet potato weevil.
D
Fig. 1.Transformation of cry3Ca1 gene in sweet potato KB1. A) Explants infected withA.
tumefaciens/pBI101/cry3Ca1onco-cultivation medium for 2 days; B)Shootregenerationfrom
survivalembrygeniccallus after4weeks on regeneration medium; C) Transgeniclinesin soil pots
inthegreenhouse;Confirmationof cry3Ca1gene integrationinto the sweetpotatogenomebyPCR
(D)and Southern blotanalysis(E).
REFERENCES [1] N. Anwar, K. Junko, A. Watarabe, Plant Cell Tiss Organ Cult 105, 2011, pp. 219-231. [2] C.A. Newell, et al, Plant Sci 107(2), 1995, pp. 215-227.
[3] M. Otani, Y. Wakita, T. Shimada, Breed Sci 53,2003, pp.145–148.
[4] B.J. Sivparsad, A Gubba., Transgenic Research 23(2), 2014, pp.377-388.
A B C E
147
P-58
ASSESSMENT OF NATURAL RAIOACTIVITY IN SURFACE SOIL
OF THOULAKHOM DISTRIC IN VIETIANE PROVINCE, LAO PDR
Sonexay Xayheungsy1, Le Hong Khiem
2
Faculty of Science, The National University of Laos, Lao PDR
2Institute of Physics, Vietnam Academy of Science and Technology, 10 DaoTan, Ba Dinh, Hanoi,
VietNam
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18
Hoang Quoc Viet, Cau Giay, Hanoi, VietNam
E-mail: [email protected]
Abstract.
The study was carried out to determine radioactivity concentration in surface soil samples
of Thoulakhom District in Vientiane province, Lao PDR and associated potential
radiological hazards. The natural radionuclide (226
Ra, 232
Th and 40
K) contents were
determined for 10 locations throughout the geological surface formations in representative
area in the city of Thoulakhom Distric in Vientiane province, Lao PDR, using high-
resolution gamma-spectrometric analysis. The ranges of specific activity for 226
Ra, 232
Th
and 40K were found to be 11.43↔30.98, 7.24↔44.56 and 9.79↔581.71 Bq kg
-1,
respectively. The anthropogenic radionuclide, 137
Cs, was not observed in statistically
signigicant amounts above the the background level in the current study. The absorbed
gamma dose rate in air at 1m above the ground surface, the outdoor annual effective dose
equivalent, with all the soil samples in the present work were evaluated. The results
indicate that the radiation hazard from promordial radionuclides in all soil samples from
area studied in this curren work is not signifacant.
Keywords: Naturally occurring radioactive materials NORM; Gamma-ray spectrometry.
REFERENCES
[1]. Akhtar, N., Tufail, M. and Ashraf, M. Natural environmental radioactivity and estimation of
radiation exposure from saline soils. Int. J. Environ. Sci. Technol. 1(4), 279–285 (2005).
[2]. A.T. Ramli, Appl. Radiat. Isot. 48 (1997) 407.
[3] IAEA, 2003. Extent of Environmental Contamination by Naturally Occurring Radioactive
Material (NORM) and Technological Options for Mitigation. Technical Reports Series No.419.
International Atomic Energy Agency, Vienna.
[4]. Gordon Gilmore, Practical Gamma-Ray Spectrometry. Ed. John Wiley & Sons Ltd. (2008)
[5]. MAESTRO. www.ortec-online.com/download/MAESTRO.pdf.
[6]. H.L. Beck, The physics o fenvironmental radiation fields, Natural radiation environment
II,CONF- 720805 P2, in: Proceedings of the Second International Symposium on the Natural
RadiationEnvironment, 1972.
[7]. B.U. Chang, S.M. Koh, Y.J. Kim, J.S. Seo, Y.Y. Yoon, J.W. Row, D.M. Lee, J. Environ.
Radioact.99 (2008) 455.
[8]. United Nation Scientific Committee on the Effects of Atomic. (UNSCEAR). (2000). Radiation
Sources and effects of ionizing radiation. New York, USA: United Nations.
[9]. International Commission on Radiological Protection,. Limits for intake of radionuclides by
workers. Oxford: Pergamon Press; ICRP Publication 65, Ann ICRP 23(2). 1993.
148
P-59
OPTICAL SPECTRAL STUDIES OF Tb3+
AND Sm3+
IONS
CO-DOPED IN ALKALI BORATE GLASSES
Hoang Sy Tai, Tran Ngoc
Faculty Natural of Sciences, Quang Binh University, Vietnam
E-mail: [email protected]
Abstract.
Spectroscopic properties of Tb3+
and Sm3+
ions doped alkali metal borate glasses (70-x-
y)B2O3.15Li2CO3.15Na2CO3.xTb2O3.ySmO2 (BLN:Tb,Sm) fabricated by melting method
have been studied. The emission intensity of Tb3+
or Sm3+
in BLN:Tb or BLN:Sm glasses
is influenced by the Tb3+
or Sm3+
doping content, and the optimum concentrations of Tb3+
and Sm3+
are 0.75 mol% and 1.0 mol%, respectively. The concentration quenching effect
of Tb3+
or Sm3+
in BLN:Tb3+
,Sm3+
glasses occurs. The BLN:Tb3+
,Sm3+
glasses can produce
color emission from green to red by properly tuning the relative ratio between Ce3+
and
Tb3+
. The results indicate that BLN:Tb3+
,Sm3+
may be a promising double emission for
white light emitting diodes.
Keywords:Tb3+
and Ce3+
ions; alkali metal borate glass, the concentration quenching
mechanism.
REFERENCES
[1] Carnall W.T., Fields P.R., and Rajnak K. (1968); J. Chem. Phys., Vol. 49, No 10, pp. 4447-
4449.
[2] Christane Görller, Walrand and K. Binnemans; Handbook on the Physics and Chemistry of
Rare Earths. Vol.25, pp 101 – 252.
[3] Dexter DL 1953 J. Chem. Phys. 21 836.
[4] Lin H, Pun EYB, Wang X, Lin X, J Alloys Compd., 2005;390:197–201.
[5] Li Pan Lai, Wang Yong Sheng.. and e.at, Chin.Phys B.,Vol. 21, No.12 (2012) 127804.
[6] Imre Á and et..all; (2006); Journal of Non-Crys. Solids, Vol. 352, Issue 8, pp. 783-788.
[7] P. V. Do, V.P.Tuyen, V.X.Quang, T.Ngoc, Opt. Mater., 55(2016) 62-67
[8] P. V. Do…(2012), Journal of Alloys and compounds 520; pp 262-265.
[9] T. Ngoc; IJEIT, Vol 4,Issue 10 (2015) 152-154.
149
P-60
EFFECT OF DISSOLVED IONS ON STRUCTURE OF
LANGMUIR MONOLAYER/WATER INTERFACEPROBED
BY SUM-FREQUENCY VIBRATIONAL SPECTROSCOPY
Nguyen Thi Hue1,2
, Nguyen The Binh1, Nguyen Anh Tuan
1
1Department of Physics, VNU University of Science, Vietnam
2Hung Vuong University, Phu Tho province, Vietnam
E-mail: [email protected]
Abstract.
Langmuir monolayer is a monomolecular layer formed on water surfaces, its structure
resembles biological membrane. Study of the effect of dissolved ions on the structure of
Langmuir monolayers on alkaline saline solution interfaces can provide important
information relating to biological processes such as cell signalling and membrane fusion.
In this report, we use a second-order nonlinear optical spectroscopy – Sum-Frequency
Generation Vibrational Spectroscopy (SFG-VS) to investigate the interaction between Na+,
K+ cations as well as Br¯, I¯ anions and Arachidic Acid (AA) monolayer/water interfaces.
The obtained SFG spectra show that those ions affect the interface in different ways. As a
result, the AA monolayer is spontaneouslycollapsed by those dissolved ions.
Keywords:Langmuir monolayer, interfacial structure, dissolved ions, Sum-frequency
vibrational spectroscopy.
Fig. 1. SFG spectra of the AA monolayers on aqueous NaCl and KCl solutions and neat
water
150
P-61
SCREENING ENDOPHYTIC YEAST IN MUSA SAPIENTUM
(TIEU HONG BANANA) FOR APPLICATION IN POSTHARVEST
BANANA
Chu Thanh Binh1, Do Thi Thu Hong
1, Ngo Cao Cuong
1, Nguyen Phuong Nhue
2
1Vietnam - Russian Tropical Center, 63 Nguyen Văn Huyen Str., Hanoi
2Institute of Biotechnology, VAST, 18 Hoang Quoc Viet Str., Hanoi
E-mail: [email protected]
Abstract.
Musa sapientum was a nutritious fruit and results high benefit due to growing easily, short
cultivation time and all year around harvest. However, post-harvest preservation was not
good cause rotten banana rate of 20%. This study aims to screen the yeast strain among 12
endophytic yeast strains isolated from Musa sapientum for banana preservation. These
yeast strains were investigated for the production of three extracellular enzymes (amylase,
cellulose, protease) by diffusion on agar plates method and grouped by fingerprinting
technic. The obtained results showed that, there were four endophytic yeast strains
producing from 2 to 3 extracellular enzymes. In combination with fingerprinting technic
and antifungal capable investigation, four endophytic yeast strains against plant fungal
pathogen as Verticillium theobromae, Piricularia grisea, Macphonia musae were selected.
They were named N4.11, 2Y1, 36Y3, 36Y4. These selected strains were classified into the
Meyerozyma species based on the ITS regional sequence analysis using ITS1 / ITS4
primers. These strains N4.11 and 2Y1 was identified similar to Meyerozyma caribbica,
other strains 36Y3 and 36Y4 was identified similar to Meyerozyma guilliermondii. With
their own biological characteristics, these four selected endophytic yeast strains can be
used in Musa sapientum banana preservation to improve the quality of post-harvest
banana.
Keywords: endophytic yeasts, fingerprinting, preservation, Meyerozyma, Musa sapientum.
151
P-62
ACOUSTIC ECHO CANCELLATION USING NEURAL NETWORK
Tung Duc-Minh Nguyen, Tuan Van Huynh
Department of Physics and Computer Science, Faculty of Physics and Engineering Physics,
University of Science, VNU-HCM, 227 Nguyen Van Cu St., Dist. 5, Ho Chi Minh city, Vietnam
E-mail: [email protected]
Abstract.
Teleconferencing systems employ adaptive filter to acoustic echo cancellation (AEC) is a
fundamental requirement of signal processing to increase the quality of teleconferences. In
this paper, we proposed Volterra filter and neural network algorithms for the AEC system
to reduce echo signal in nonlinear system. The influence of the neural network architecture
and its learning algorithms used for echo cancellation will be covered in this paper. The
least mean square (LMS) algorithm is used to train the weight vector of the neural network.
The simulation results will present to test the effectiveness of the proposed AEC system in
a nonlinear acoustic environment.
Keywords:acoustic echo cancellation, AEC, neural network.
152
P-63
NORMAL FAMILIES OF MEROMORPHIC MAPPINGS
Nguyen Thi Thu Hang
Department of Mathematics, Hai Phong University, 171 Phan Dang Luu – Kien An – Hai Phong –
Vietnam
E-mail: [email protected]
Abstract.
The Little Picard Theorem states that if a meromorphic function on the complex plane
omits three distinct points in , then it is a constant function; and the classical result of
Montel says that the family F of meromorphic functions on a domain is normal if
there are three distinct points a, b, c ∈ such that each element of F omits each of a, b and
c in D. The Little Picard Theorem was generalized to the case of entire curves in the
complement of 2n + 1 hyperplanes in general position in by Green, and to the case of
entire curves in the complement of 2n + 1 hypersurfaces in general position in by
Eremenko. According to Bloch‟s principle, to every „Picard-type‟ theorem, there should
belong a corresponding normality criterion. The normality result corresponding to the
aforementioned Picard-type theorems was proved by Tu, and Tu-Li. In this paper, we
introduction this problem for the case where the mappings of the family can meet the
hyperplanes (and hypersurfaces).
153
P-64
THE EFECT OF ZEROVALENT COBALT NANOPARTICLE ON
THE GROWTH, PHOTOSYNTHETIC PARAMETERS OF SOYBEAN
GLYCINE MAX (L ) ERR “D 26” A DIFFERENT STAGES
Phan Hoang Tuan2, Hoang Thi Lan Anh
1, Luu Thi Tam
1,
Ngo Thi Hoai Thu1, Dang Diem Hong
1*
1) Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang
Quoc Viet, Cau Giay, Hanoi, Vietnam
2) University of Science - University of Thai Nguyen, Thai Nguyen, Vietnam
E-mail: [email protected]
Abstract.
Nanotechnology has widespread using in many fields such as electronic, environmental,
cosmetic, pharmaceutical, material and agriculture applications. In section of agriculture, it
has great potential for increasing crop yield and productivity, decreasing the amount of
toxins and fertilizers, increasing the length of time spent to preserve farming productions.
Soybean is an important crop and a source of food for humans and livestock. In this study,
both zerovalent colbalt nanoparticles made from Vietnam and USA with different
concentrations (0, 0.17 and 16.7 mg/kg seed) was used. The growth, photosynthetic
parameters of soybean Glycine max (L). Merr. DT26 were evaluated at first (V1), third
(V3) and fifth (V5) trifoliate and begin at flowering (R1) stages.
Parameters such as Fo (initial fluorescence), Fm (maximal fluorescence), Fv/Fm (maximal
photochemical efficiency), effective quantum yield of photosystem II (PSII),
photosynthetic electron transport rate (ETR), Pn (net photosynthetic rate) and chlorophyll a
content of soybean seedlings which were treated with cobalt nanoparticles were higher
than in the control. The value of these parameters had tended to gradually increased and
reached maximum at V5 stage. The above mentioned parameters significantly decrease at
R1 stage. Similar trend was observed in the growth indices (such as the plant height, dry
weights of stems and leaves and leaf area). Crop yield of experimental formulas exceeded
the control (5%) while the quality of grain was no significant different among plots. The
obtained results also showed the efficiency of zerovalent cobalt nanoparticle originated
from Viet Nam was similar to USA.
Keywords: photosynthesis, soybean, zerovalent cobalt nanoparticles.
154
P-65
ESTIMATE HADRONIC PROCESS FROM PARTONIC
AT HADRONS COLLIDERS
Chi Linh Nguyen
Faculty of Physics and Engineering Physics, University of Science,
227 Nguyen Van Cu Str. District 5, Ho Chi Minh City
E-mail: [email protected]
Abstract.
We build a C/C++ program which allow estimating cross section of hadronic process given
the formula of partonic amplitude. The study is based on the theory of quantum
chromodynamics (QCD) and parton distribution [1] of hadron in elementary particle
physics. The hadronic cross section is calculated by convoluting partonic amplitude with
parton distribution functions (PDFs) [2]. This fact causes the dimensions of integral
increase two comparing to the partonic cross section. The multiple integral of this study is
treated using adaptive Monte Carlo program [3].
Keywords:QCD, Standard model, LHC, PDFs, Monte Carlo.
REFERENCES
[1] J. Pumplin, D.R. Stump, J. Huston, H.L. Lai, Pavel M. Nadolsky, W.K. Tung (Michigan State
U.), New generation of parton distributions with uncertainties from global QCD analysis,
JHEP0207 (2002) 012.
[2] LHAPDF the Les Houches Accord PDF Interface, “https://lhapdf.hepforge.org/”
[3] G. P. Lepage, A new algorithm for adaptive multidimensional integration, J.Comput.Phys. 27
(1978) 192 SLAC-PUB-1839-REV, SLAC-PUB-1839.
155
P-66
RESEARCHING ANATOMICAL CHARACTERISTICS AND
ANTIBACTERIAL ACTIVITY OF Capparis dongvanensis Sy,
B.H. Quang & D.V. Hai
Nguyen Phuong Thao1, Nguyen Huu Quan
1, Pham Van Khang
2, Sy Danh Thuong
1*
1) Falcuty of Biology, Thainguyen University of Education, ThaiNguyen city, Vietnam
2) Falcuty of Chemistry, Thainguyen University of Education, ThaiNguyen city, Vietnam
*E-mail: [email protected]
Abstract.
Capparis dongvanensis is an endemic plant of Vietnam, belonging to Capparaceae [2]. The
research samples were collected in Dong Van District, Ha Giang Province. To study the
anatomical structure, we collected young stems and leaves, then cut thin, double dyeing
and observed on a microscope using Microscope manger software. The extract from C.
dongvanensis was used for research antibacterial activity of Staphylococcus aureus and
Bacillus subtilis [1].
The anatomical structure of C. dongvanensis is characteristic of the dicotyledon. Anatomy
of the stem including: cork ouside, thick 6µm. Cortex is about 80μm thick, including three
types of tissue: angular collenchyma has 3-4 cell layers; parenchyma has 6-8 cell layers,
chlorophyll; screlenchyma concentrated into clumps. The vasculars include xylem,
canbium and phloem arranged in a loop. Pit consists of cells with a diameter of 18-25μm.
Anatomy of the leaf including: epidermis, parenchyma and vein. Epidermis includes upper
epidermis and lower epidermis. Parenchyma differentiated into palisade parenchyma and
spongy parenchyma. Palisade parenchyma has 2-3 cell layers, contains chlorophyll, thick
10-14 μm. Spongy parenchyma has 10-12 cell layers, round or ovate, with a large
intercalation area, thick 10 μm. The main vein contains the xylem above, the phloem
below. Upper of xylem, there are 3-4 collenchyma layers. Parenchyma contains oval cells.
Ethyl acetate extract at 30 mg/ml showed maximum antibacterial activity on S. aureus,
followed by ethyl acetate extract at 10 mg/ml, 100 mg/ml and chloroform extract at 10
mg/ml; the diameters of the inhibition cycles were 10 mm and 9 mm, respectively.Whereas
Ethanol extract at 10mg/ml, 100 mg/ml and chloroform extract at 30 mg/ml inhibited S.
aureus lowest, the diameters of antibacterial is 4 mm. B. subtilis had the highest inhibitory
activity by ethanol extract at 10mg/ml, 100 mg/ml and chloroform extract at 30 mg/ml; the
diameters of the inhibition cycles were 13 mm, 11 mm and 9 mm, respectively. Etanol
extract at 30 mg/ml inhibited B. subtilis lowest (the diameters of antibacterial was 4 mm).
So, the extracts of C. dongvanensis with ethanol, chloroform and ethyl acetate inhibited the
development of S. aureus and B. subtilis at 10-100mg/ml, and antibacterial activity was
different.
Keywords:Anatomy, antibacterial activity, Capparis, Capparaceae, Dongvan.
REFERENCES [1] Nguyen Thuong Dong, 2006, Science and Technology Publishing House, Ha Noi.
[2] Sy Danh Thuong et al., , Nordic Journal of Botany, 35, 2017, pp. 272-275, Sweden.
156
P-67 SEGMENTATION OF TYMPANIC MEMBRANE
USING POLARIZED IMAGING
Tran Van Tien, Le Thanh Tung, Nguyen Hai Dang, Bui Mai Quynh Linh,
Ngo Ngoc Uyen, Phan Ngoc Khuong Cat, Huynh Quang Linh
Department of Applied Physics, Faculty of Applied Science,
Ho Chi Minh City University of Technology,VNU-HCM
E-mail: [email protected]
Abstract.
Otitis media is one of the most common infections among children on over around the
world. To diagnose otitis media, most physicians base on clinical symptoms and changes
of tympanic membrane. Physicians usually use otical otoscope or pneumatic otoscopy to
examine the tympanic membrane. Diagnosing children with acute otitis media is difficult,
therefore, there are more and more algorithms developed to help physicians diagnose otitis
media. In the present word, we focus on performing photograph of middle ear based on
changing some properties of light source such asintensity or using polarized light. After
that, we detect the tympanic membrane using some of the algorithmson the matlab
platform.
Keywords: otitis media, endoscope, inflammation.
REFERENCES
[1]Júnior JFN, Cruz DN, Ear endoscopic surgery: dissection of the middle ear, International of
Otorhinology, 2009;13: 46–52.
[2] Neri G, Mennucci E, Ortore R, Leone O, Croce A, Rhinopharynx endoscopy in the diagnosis of
chronic otitis media with effusion in infancy, Acta Otorhinolaryngol Ital, 2004 Apr; 24(2):63-7
[3] Nikolaos S Tsilis, Petros Vlastarakos, Chronic Otitis Media in Children: An Evidence-Based
Guide for Diagnosis and Management, Clinical Pediatrics 52(9), March 2013.
157
P-68
STUDY ON CHROMATOGRAM LAYER METHODS FOR
DETERMINATION ANTIMICROBIAL ACTIVITY OF MARINE
BACTERIA EXTRACTS.
Tran Nguyen Ha Vy, Nguyen Thi Thuan, Vo Mai Nhu Hieu and Tran Thi Thanh Van
Chemical Analysis and Technology Development Department, Nha Trang Institute of Technology
Research and Application, VAST, 02 Hung Vuong-Nha Trang-Khanh Hoa-Vietnam
E-mail: [email protected]
Abstract.
In recent years,several pathogenic bacteria present resistance against antibiotics, being
necessarythe search and develop new drugs with activity against resistant pathogens from
various sources. Therefore, antimicrobial activity evaluating methods has been widely
reported. Severalantibacterial activity bioassays such as disk diffusion, welldiffusion or
agar dilution are well known and commonly used, but bioautography (thin layer
chromatographic - TLC) is a new microbial detection methodnot only investigating
biochemical processes and factors influencing bacterial growth,but also for testing various
groups of compounds. In this article, we searched the antibacterial activity ofseveral
organic extracts from marine bacteria, which were isolated from near coast of Vietnam
island from corals and sponges. Test bacteria were bothGram-negative (Pseudomonas
aeruginosa and Escherichia coli) and Gram-positive(Listeria monocytogenes, Bacillus
cereus and Staphylococcus aureus) human pathogenic bacterialstrains. The results research
confirm the potential use of marine bacteria extracts as a source of antibiotic compound
and open the possibility of use of new drugs.
Keywords:Thin layer chromatographic – TLC, antimicrobial activity, marine bacteria
extract.
158
P-69
EFFECT OF OXYGEN DEFECTS ON THE ELECTRONIC
STRUCTURE AND THERMOELECTRIC PROPERTY
OF BISMUTH OXIDE SELENIDE
Tran Van Quang
Department of Physics, University of Transport and Communications,
No. 3, Lang Thuong, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
Bismuth oxide selenide, Bi2O2Se, was experimentally investigated as a good
thermoelectric material due to the low thermal conductivity. In this study, we perform first-
principles calculation and utilize the solution of Boltzmann transport equation in a constant
relaxation-time approximation to study electronic structure and the thermoelectric
properties of Bi2O2Se under some oxygen defect types, i.e. vacancies and point defects.
Oxygen vacancies trap bands located inside the band gap of Bi2O2Se and lead it to be
conducting with n-type semiconductor type. These bands are responsible for a drastic
reduction of the Seebeck coefficient whereas the oxygen point defects remain the
semiconducting feature. For the point defects, the power factor markedly increases during
p-type doping compared with that during n-type doping. The optimal carrier concentrations
are also discussed.
159
P-70
NON-LINEAR MARGINAL AND GENERALIZED LINEAR MIXED
REGRESSION MODELS OF AIDS INCIDENCE IN BANGKOK
Pianpool Kirdwichai
Department of Applied Statistics, Faculty of Applied Science,
King Mongkut’s University of Technology North Bangkok,
1518 Pracharat 1 Road, Bangsue, Bangkok, Thailand. 10800
E-mail: [email protected]
Abstract.
This paper illustrates the use of modern regression methods in modelling annual AIDS
incidence. In particular, the methods address issues such as non-normality of responses and
non-linearity and lack of independence in the responses over time. Non-linear marginal
regression models are considered when the normality assumption is valid while generalised
linear mixed regression methods are used to develop models for estimation and prediction
of incidence for subgroups of AIDS patients in Bangkok when the normality assumption
fails. Annual incidence data covering the period 2005-2015 and obtained from Group Plans
and Information AIDS TB and STIs Control Division of Bangkok Health Center is used in
building the incidence models. The results show that the overall AIDS incidence in
Bangkok decreases by roughly 80% year on year but this decrease is not reflected in all
subgroups of the population. In particular, the decrease in incidence is shown to be slowing
down in young men, older people and male prisoners. This latter group have been
identified as a key group left behind in prevention strategies. On the other hand, the rate of
decline in incidence appears to be increasing in people who inject drugs.
REFERENCES
[1] http://www.unaids.org/sites/default/files/media_asset/2016-prevention-gap-report_en.pdf 2016
[2] Thai National Aids Committee, Thailand aids response progress report 2015,
http://www.unaids.org/sites/default/files/country/documents/THA_narrative_report_2015.pdf
[3] UNESCO, “Young people and the law in asia and the pacific: a review of laws and policies
affecting young people's access to sexual and reproductive health and hiv services”,
http://unesdoc.unesco.org/images/0022/002247/224782E.pdf, 2013
[4] Thai National Aids Committee, “National aids strategy for 2012 to 2016”, 2016
[5] A. Cameron and P.Trivedi, “Regression-based tests for overdispersion in the Poisson model”,
Journal of Econometrics, 46(3), 1990, pp. 347-364
[6] C.Kleiber and A.Zeileis, “Applied Econometrics with R”, Springer-Verlag, https://CRAN.R-
project.org/package=AER, 2008
160
P-71
COMPARING ANALYTICAL AND NUMERICAL SOLUTIONS IN
IDENTIFICATION OF THE BUCKLING CAPACITY OF AXIALLY
LOADED CASTELLATED STEEL COLUMNS
Tran Ngoc Tuyen1, Dang Hong Lam
2
1) Faculty of Engineering and Technology, Hatinh University; No. 447 Road 26-3, Hatinh, Vietnam
2) Faculty of Civil Engineering, University of Transport and Communication, No. 3 Cau Giay
Street, Dong Da District, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
The increasing demand for economy and architecture of steel structures for several years
has raised questions about the analysis and design of I-shaped columns with web
perforations, in particular, the elements with hexagonal perforations in the web called
castellated I-shaped columns (castellated columns [1]). This paper aims at studying the
elastic buckling load of axially loaded castellated columns and then comparing formulas of
analytical computations [2, 3] with numerical methods from the finite element method
(FEM) using the Code_Aster and the software ANSYS 16.0. In addition, the study also
takes into account the influence of various end conditions on the buckling capacity. The
application of the columns is efficient in cases with low axial loads, such as gable-
columns, portal legs, wind-posts, and valley-columns.
Keywords:Castellated, columns, buckling, steel, finite element, Code_Aster, ANSYS…
REFERENCES
[1] K. M. El-Sawy, A. M. I. Sweedan, and M. I. Martini, “Major-axis elastic buckling of axially
loaded castellated steel columns,” Thin-Walled Struct., vol. 47, no. 11, pp. 1295–1304, 2009.
[2] T. N. Tuyen, Comparison of several formulas for determining critical force of castellated steel
columns, Journal of structural engineering and construction technology - Vietnam,no. 22, pp.
48-54, 2016.
[3] W. Bin Yuan, B. Kim, and L. Y. Li, “Buckling of axially loaded castellated steel columns,” J.
Constr. Steel Res., vol. 92, pp. 40–45, 2014.
161
P-72
INTERPRETATION OF THE GROUND PENETRATING RADAR
DATA USING THE WAVELET TRANSFORM MODULUS MAXIMA
Duong Quoc Chanh Tin1, Duong Hieu Dau
1,
Nguyen Thanh Van2, Nguyen Van Thuan
2
1Can Tho University, Campus 2, 3/2, Ninh Kieu, Can Tho
2University of Science, VNU Ho Chi Minh City, 227 Nguyen Van Cu, District 5, Ho Chi Minh
E-mail: [email protected]
Abstract.
Ground penetrating radar (GPR) data processing takes too much time because it has many
stages for calculation such as: data format, topographic correction, denoising, amplification
and some others. In final analysis step, there crucial parameters: depth, position, and size
of the buried objects were needed to determine. The determination for those parameters of
a buried objects using traditional GPR methods has many difficulties since this calculation
depends on electromagnetic wave velocity in the material, and this velocity varies very
complex in all directions. In this paper, the wavelet transform modulus maxima (WTMM)
method with the appropriate wavelet functions were introduced to interpret the GPR data,
thereby it is easy to estimate of depth, size and position of the buried objects without the
consideration of electromagnetic wave velocity in the material. This GPR analysis can be
applied for the research of shallow geological structure.
Keywords:Ground penetrating radar, appropriate wavelet functions, detecting buried
objects, wavelet transform modulus maxima.
REFERENCES
[1] Duong Hieu Dau, Interpretation of geomagnetic and gravity data using continuous wavelet
transform, Vietnam National University Ho Chi Minh City Press, 2013, pp. 127.
[2] Fiorentine A., and Mazzantini L., Neuron inhibition in the human fovea: A study of interaction
between two line stimuli, Atti della Fondazione Giorgio Ronchi, 21, 1966, pp. 738-747.
[3] Mallat S., Hwang W. L., Singularity Detection and Processing with Wavelets, IEEE
Transactions on information Theory, 38 (2), 1992, pp. 617-643.
[4] Moffatt D. L., Puskar R. J., A subsurface electromagnetic pulse radar, Geophysics, 41, 1976,
pp. 506-518.
[5] Nguyen Thanh Van, Nguyen Van Giang, Ground penetrating radar – Methods and
Applications,Vietnam National University Ho Chi Minh City Press, 2013, pp. 222.
[6] Sheng H. N., Yan H. H., Kuo F. L., Da C. L., Buried pipe detection by ground penetrating radar
using the discrete wavelet transform, Elsevier, Computers and Geotechnics. 37, 2010, pp. 440-
448.
[7] Duong Quoc Chanh Tin, Duong Hieu Dau, Nguyen Thanh Van, Nguyen Van Thuan, The
continuos wavelet transform in processing data of high frequency electromagnetic prospecting,
Science & Technology development Journal,Vietnam National University Ho Chi Minh City, 19.
2016, pp. 81-93.
162
P-73
THE RESPONSE AND EFFICIENCY OF N-TYPE HPGe DETECTOR
USING MONTE CARLO SIMULATION
Huynh Thi Yen Hong, Truong Huu Ngan Thy, Dang Thi Thao My, Vu Ngoc Ba,
Truong Thi Hong Loan
Nuclear Technique Laboratory, University of Science, 227 Nguyen Van Cu, Ward 4, District 5,
HCMC, Vietnam
E-mail: [email protected]
Abstract.
In this work, the response and efficiency of a n-type HPGe detector was investigated by
Monte Carlo simulation using PENELOPE. The validity of the model was evaluated by
comparing the simulated full-energy peak efficiency with the measured value. Modeling of
the detector geometry was described in detail, and differences between the simulated and
measured spectra were discussed. Effects at low energy region, Compton scattering,
multiple Compton scattering and the low-energy tail of the peak were investigated for
point sources emitting only single energy. For point sources emitting multiple energy were
investigated additional effects in the photoelectric peaks region and high energy region.
REFERENCES
[1] Dryak Pavel and Kovar Petr, Applied Radiation and Isotopes64, 2006, 1346-1349.
[2] Vargas M. Jurado, Guerra A.L., Applied Radiation and Isotopes 64, 2006, 1319-1322.
[3] Vidmar T., Korun M., Likar A., Martincic, Nuclear Instruments and Methods in Physics
Research Section A 470, 2001, 533-547.
[4] Zhonglu Wang, Bernd Kahn and John D. Valentine, IEEE Transactions on Nuclear Science,
vol. 49, no. 4, 2002, 1925-1931.
163
P-74
ELECTROENCEPHALOGRAPHY ANALYSIS
USING NEURAL NETWORK
Ngan Vuong Thuy Nguyen, Tuan Van Huynh
Physics and Computer Science Dept., Physcis and Engineering Physics Faculty,
University of Science, VNU-HCM, 227 Nguyen Van Cu Str., Dist. 5, Ho Chi Minh city, Vietnam
E-mail: [email protected]
Abstract.
To gather information of human activities through brain wave - EEG signal, various
algorithms have been introduced and researched relating to 3 main filters: digital filter,
wavelet filter and neural network. By applying filters into identify some different states of
EEG, this paper gives an insight of neural network performance, comparing with others, on
simple activities of human brain. In details, researched human activities include states
involving to eyes behavior, facial expression and thinking signal. The raw ECG signal has
been acquired by Emotiv EPOC+ and analyzed with Matlab. Furthermore, the comparison
of algorithms efficiency has been done with MSE value and other parameters which
demonstrate the possibility of using neural network to analyze EEG signal.
164
P-75
DETERMINATION OF NATURAL RADIOACTIVITY AND
PUBPLIC DOSE ASSESSMENT IN SOIL SAMPLES KHAMMOUANE
PROVINE, LAOS
Somsavath Leuangtakoun1,2
, Bui Van Loat1, Bui Thi Hong
1,Vu Thi Kim Duyen
3,
Khong Nam Khang4, SounthoneSingsoupho
2
1Department of Nuclear Physics, Faculty of Physics, VNU University of Science, 334 Nguyen Trai,
Hanoi, Vietna
2National University of Laos, P.O.Box: 7322 , Dongdok Vientiane, Laos
3Centre for Env. Trea. Tech., Ministry of Defence, 282 Lac Long Quan, Hanoi, Vietnam
4Military Institute of Medical Radiology and Oncology.
Abstract.
This paper presents, the radiation protection viewpoint, is to study the activity
concentrations of naturally occurring radionuclides in surface soils and the extent of their
exposure to the population. The radioactivity concentrations of 226
Ra,232
Th and 40
K for
samples of surface soil collected in Khammouane Provine, Lao, using an HPGe detector at
VNU University of Science. From activity concentration of 226
Ra, 232
Th and 40
K are
calculated the radium equivalent activity and outdoor annual effective dose (E). The
estimated average outdoor annual effective dose (E) and radium equivalent actitvity (Raeq)
are 0.18 ± 0.01 mSv.yr-1
and 168.44 ± 15.10 Bq.kg-1
, respectively.
Keywords:Gamma spectrometry, Activity concentration, Radium Equivalent Activity,
Absorbed gamma dose rate, Annual effective dose rate, Minimum Detection
Limit.
165
P-76
ELECTROCHEMICAL FABRICATION OF PLASMONIC
NANOCOMPOSITE BASED ON GOLD-GRAPHENE OXIDE AND
SILVER-GRAPHENE OXIDE CLUSTERS.
Tran Thu Hien1, Nguyen Thi Thu Thuy1, Nguyen Thanh Liem1, Pham Hong Minh1, S A
Tikhomirov2,O. V. Buganov2 and Do Hoang Tung1
1Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau
Giay, Hanoi, Vietnam
2B I Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Prospekt
Nezavisimosti, 220072 Minsk, Republic of Belarus
E-mail: [email protected]
Abstract.
Plasmonic nanocomposite based on gold-graphene oxide and silver-graphene oxide
clusters were prepared by plasma assited electrochemical method. Their morphologies
were analysed with TEM showing GO flakes decorated with noble nanoparticles. Noble
nanoparticles size shape and concentration can easily be tuned by varying plasma condition
giving rise to different surface plasmonic resonances measured with UV-vis absorption
spectroscopy.
166
P-77
PREPARATION OF PLASMONIC TiO2-Ag AND TiO2-Au
NANOCOMPOSITE MATERIALS BY PLASMA – LIQUID
INTERACTION METHOD
Nguyen Thi Song Thuong1, Nguyen Thi Thu Thuy1, Nguyen Thanh Liem1, Pham Hong
Minh1, Pham Van Duong1, S.A.Tikhomirov2, O. V. Buganov2 and Do Hoang Tung1
1Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau
Giay, Hanoi, Vietnam
2B I Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Prospekt
Nezavisimosti, 220072 Minsk, Republic of Belarus
E-mail: [email protected]
Abstract.
Sensitivity of the surface plasmon resonance (SPR) of noble metal nanoparticles to
dielectric properties of surrounding media is now strongly studied and is already applied at
nanophotonics and optoelectronics for chemical, biological and medical sensing.
Dependence of the SPR characteristics on metal nanoparticle sizes and shapes is
considered as an effective way to the returning of the SPR spectral position as applied to
specific targets. In this work, plasmonic TiO2-Ag and TiO2-Au nanocomposite materials
were synthesised by plasma – liquid interaction method. Their morphologies were
measured with TEM in accordance to there plasmonic properties analysed by UV-vis
absorption spectroscopy.
167
P-78
HIGH-EXTRACTION EFFICIENCY, SIDE-PUMPED DIAMOND-
CUT Ce: LICAF ULTRAVIOLET LASER OSCILLATORAND
AMPLIFIER
Pham Van Duong1, Nguyen Xuan Tu
1, Bui T. Thuy Duong
1, Nguyen Van Diep,
Pham Hong Minh1, Marilou Cadatal-Raduban
2
Nguyen Van Phu3 and Nobuhiko Sarukura
4
1Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Hanoi, Vietnam
2Centre for Theoretical Chemistry and Physics, Institute of Natural and Mathematical Sciences,
Massey University, Albany, Auckland, 0632 New Zealand
3Vinh University, Nghe An Province, Vietnam
4Institute of Laser Engineering, Osaka University 2-6 Yamadaoka, Suita Osaka 565-0871 Japan
E-mail: [email protected]
Abstract.
A two-side pumping configuration for laser oscillationand amplification of ultraviolet
pulses using a diamond-cut Ce3+
:LiCaAlF6 crystal is proposed. Owing to total internal
reflection of the pump beam, a 50% improvement in absorption ratio is expected for a
1=103o,2=4=82
o, 3=93
o, L=0.64 cm diamond-cut crystal with a height of 2 cm and
absorption coefficient of ~1.5 cm-1
. Calculation results provide a guideline when choosing
crystal geometry, size, and absorption coefficient in order to achieve high extraction
efficiency and homogeneity, which when combined with high-energy, multiple-beam
pumping would enable the development of an all-solid-state ultraviolet laser operating at
terawatt level.
Keywords: Ce:LiCAF crystal, ultraviolet, broadband, short pulse laser emission.
168
P-79
DEVELOPMENT OF A LASER PULSE AMPLIFIER BASED ON
CHIRPED PULSE AMPLIFICATION TECHNIQUE
FOR ULTRASHORT TITAN-SAPPHIRE LASER PULSES
Pham Huy Thong1, Nguyen Xuan Tu
1, Pham Van Duong
1, Nguyen Thanh Dan
1,
Pham Hong Minh1*
, Buganov Oleg2 and S.A. Tikhomirov
2
1Center for Quantum Electronic, Institute of Physics, Vietnam Academy of Science and
Technology. 18 Hoang Quoc Viet, Cau Giay, Hanoi
2B.I. Stepanov Institute of Physics, National Academy of Science of Belarus
*E-mail: [email protected]
Abstract.
Chirped-Pulse Amplification (CPA) technique has been used widely to produce intense
ultra-short laser pulses. We have developed successfully a laser pulse multi-pass amplifier
based on CPA for femto-second titan-sapphire laser pulses. This amplifier was pumped at
532 nm at 10 Hz by a high power Nd:YAG laser. The amplifier was well combined with:
A pulse selector which selects single ser pulses at 10 Hz from the mode-locked femto-
second titan-sapphire laser pulses of 80 MHz;
A single grating (1200 graves/mm)-based pulse stretcher. This stretcher of a horizontal
beam size of 4 cm on a grating surface well stretched single laser pulses of 150 fs (at 800
nm and 10 Hz) to 36 ps corresponding to a large stretching factor.
A single grating (1200 graves/mm)-based compressor which works in a similar way to the
pulse stretcher or compressor using a pair of gratings and well compressed single amplified
laser pulses of 36 ps to 150 fs.
In energy, this multi-pass CPA amplifier has been successfully used for amplifying pulse
energy of femto-second titan sapphire laser pulses from 10 nJ to 70 µJ, corresponding to a
factor of 7000.
169
P-80
THE FORMATION OF REDUCED GRAPHEN OXIDE
FROM GRAPHITE BY MODIFIED HUMMERS PROCESS
Nguyen Chi Thang, Ha Xuan Vinh
Nhatrang Institute of Technology Research & Application, Viet Nam Academy of Science and
Technology (VAST)
E-mail:[email protected]
Abstract.
Recently, graphene oxide (GO) and reduced graphene oxide (rGO) were studied with many
interesting features at 2D structures. The GO, rGO could be obtained from different
fabrication methods. In this work, the reduced graphene oxide (rGO) material was
synthesized by the modified Hummers method; the pre-material was graphite powder; the
final materials obtained from this synthesis process were rGO powder and rGO solution.
The formation of rGO was via four steps: graphite graphite oxide graphene oxide
(GO) rGO, at each step, the morphological and features of the material were
investigated and analyzed by SEM, FTIR, DLS. The results described the oxidation of the
graphite layers and showed the exfoliation of the layers to form the rGO. In addition, they
indicated the reduction of functional groups when forming rGO from graphene oxide
(GO).
The results showed a clear view of the material forming process, and they showed the
ability to synthesize rGO by the modified process. This process had high efficiency in
reducing of functional groups, which influence to the conductivity of the rGO.
Keywords:rGO, graphene oxide, Hummers, electronic devices.
170
P-81
ISOLATION AND SCREENING PYRUVATE- PRODUCING
MODERATELY HALOPHILIC BACTERIA FROM SALTERS
IN NAM DINH PROVINCE
Hoang Thi Lan Anh*, Ngo Thi Hoai Thu, Hoang Thi Huong Quynh,
Dang Diem Hong*
Algal Biotechnology Department, Institute of Biotechnology,
Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi
E-mail: [email protected]; [email protected]
Abstract.
Pyruvic acid (pyruvate) is a central intermediate in all organisms. It is widely used as a
starting material in the industrial biosynthesis of pharmaceuticals and is employed for the
production of crop-protection agents, polymers, cosmetics, and food additives.
Halophilic microorganisms, especially Halomonas genus, are potential candidates for
producing valuable products as polyhydroxyalkanoates (PHA), ectoine, enzymes and
pyruvate. In this study, a moderate halophilic, Gram-negative, and aerobe designated as
strain HC3 isolated from salter in Nam Dinh province was shown to produce the pyruvate.
The isolate was rod-shape, 0.56 - 3.16 m in length. Colonies on solid medium were
circular, smooth and yellow. The strain grew under environment conditions of 0.5 - 20%
(w/v) NaCl, pH 5 - 12 and at temperature from 20oC to 45
oC. Test for oxidase, catalase
activities were positive. This strain reduced nitrate to nitrite. G + C content of HC3 strain
was 62.8 mol%. The predominant fatty acids profile of this strain was C16:0, C18:1 7c, C16:1
7c and C12:0 3OH. Phylogenetic analyses based on 16S rRNA gene sequence has shown
that this strain was belonging to the genus Halomonas. Based on physiological, biological
and chemotaxonomic data, it is proposed that the strain HC3 be assigned to the genus
Halomonas as Halomonas sp. HC3.
Keywords: Halomonas, Halophile, pyruvate, taxonomy, 16S rRNA genes.
171
P-82
INFLUENCE OF SURFACE PLASMON EFFECT FROM GOLD
NANOPARTICLES ON FLUORESCENCE EMISSION OF Cy3 DYE
Chu Viet Ha1, Le Thuy Linh
1, Nguyen Thi Bich Ngoc
2, Tran Hong Nhung
2
1 Thai Nguyen University of Education, Thai Nguyen, Vietnam
2Institue of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
E-mail: [email protected]
Abstract.
This work reports on the result of the influence of surface plasmon effect from colloidal
gold nanoparticles on fluorescence emission of Cyanine 3 (Cy3) dye. Due to the surface
plasmon effect of gold nanoparticles, the fluorescence of Cy3 dye nearby them can be
enhanced or quenched depending on the distance between the Cy3 molecules and the gold
nanoparticles. Optimal fluorescence enhancement of Cy3 dye has been observed in the
mixture with gold nanoparticles; and the fluorescence enhancement has been observed
when the gold concentration increases up a specified value. The gold nanoparticles can
enhance or quench the fluorescence of Cy3 dye depending on energy transfer mechanisms,
the dominating of surface plasmon coupling emission process or the Förster energy transfer
from dye molecules to gold particles exciting absorption plasmon.
0 20 40 60 80 100 120
4
6
8
10
12
14
16
Experiment
Linear fit
Quantity of gold (L)
Flo
ure
scen
ce I
nte
nsi
ty (
a.u.)
Fig. 1. The flourescence spectra of Cy3 dye in the present of 10 nm gold nanoparticles.
REFERENCES
[1] J. Zhu et al. / Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 188
(2017) 170–178
[2] T. Gulin-Sarfraz, J. Sarfraz, D.Ş. Karaman, J. Zhang, C. Oetken-Lindholm, A. Duchanoy, et al.,
RSC Adv. 4 (2014) 16429–16437S.
[3] J. Asselin, M.L. Viger, D. Boudreau, Metal-Enhanced Fluorescence and FRET in Multilayer
Core-Shell Nanoparticles, Adv. Chem. 2014 (2014) e812313.
172
P-83
EFFECT OF ANNEALED TIMES ON STRUCTURAL, OPTICAL
AND COMPOSITIONAL PROPERTIES ON THE CZTSSe
Dao Tuan Anh, Phan Thi Kieu Loan, Nguyen Huu Ke, Le Vu Tuan Hung
Faculty of Physics and Engineering Physics, University of Science, Vietnam Natoinal University
Ho Chi Minh city, 227 Nguyen Van Cu St., Ward 4, District 5, Ho Chi Minh City, Vietnam
E-mail: [email protected]
Abstract.
CZTSSe absorber thin films is fabricated by Sol-Gel method, the precursor sol solutions
were spin - coated on glass substrates. Then, the precursor thin filmswere annealed in
selenium atmosphereat temperature at 5400C for an hour. Effect of annealed times
onstructural, optical and compositional properties on the CZTSSe thin films were analyzed
by X-ray diffraction, Raman method, UV-vis spectra and Energy -dispersive X-ray
spectroscopy (EDS). The result of analyze by XRD and Raman method showed that
CZTSSe thin filmsexists kesteritestructurewith (112), (220/204), (312/116) planes. The
bandgap energy of CZTSSe thin films werefrom 1.2 to 1.6 eV, depending on annealing
temperature condition and ratio of Se content
Keywords: CZTSSe, Sol-gel, absorber Thin film, Kesterites.
REFERENCES
[1] Qing-Yao Wen, Yan Li, Jian Wang, Jian-Jun Yan, Cheng-Wei Wang, Superlattices and
Microstructures, V. 85, 2015, pp. 331-338.
[2] Sunwook Hwang, Dae-Hwan Kim, Dae-Ho Son, Kee-Jeong Yang, Dahyun Nam,Hyeonsik
Cheong, Jin-Kyu Kang, Su-il In, Solar Energy Materials and Solar Cells, V. 143, 2015, Pages
218-225.
[3] XianMing Wang, ShiBing Sun, Yong Zheng Zhang, Yuxiu Sun, JingBing Liu, Hao Wang,
(2014). Material letter, V. 138, 1 January 2015, Pages 265-267.
[4] Andrew Fairbrother, Xavier Fontan, Victor Izquierdo-Roca, Moises Espindola-Rodriguez,
Simon López-Marino, Marcel Placidi, Juan López-García, Alejandro Péguez- Rodríguez, and
Edgardo Saucedo, ( 2013). Chemphyschem. 14, 2013 ;14 pp:1836-43.
[5] Wen Li, Xiuxun Han, Yun Zhao, Yonge Gu, Shengrong Yang, Tooru Tanaka, Journal of Powe
Sources, V.294, 2015, pp. 603-608.
173
P-84
APPLICATION OF THE COLLECTIVE MODEL TO DETERMINE
SOME VIBRATIONAL BANDS OF 140
LA NUCLEUS
Nguyen Duc Hoa1, Nguyen An Son
1, Le Viet Huy
1, Pham Ngoc Son
2
1 Dalat University, 01 Phu Dong Thien Vuong st., ward 8, Dalat city, Lam Dong Province
2 Nuclear Research Institute, Nguyen Tu Luc st., Dalat city, Lam Dong Province
E-mail: [email protected]
Abstract.
140La is created from the
thermal neutron capture reaction of
139La, which is the product of
the fission reaction. It makes some effects into the components of the nuclear reactor core.
Understanding the properties and structure of 140
La is important in operating the nuclear
reactor. Besides that, nuclear structure models are very effective in explaining the
properties of nuclear structure. There are many nuclear structure models to solve those
problems, such as Liquid Drop Model, Shell Model, Fermi Model, etc. Among them, the
Collective Model has been very successful in describing the variety of nuclear properties,
especially energy levels in deformed nuclei that the Shell Model and the Liquid Drop
Model does not apply. This paper presents the application of the Collective Model to
determine some vibrational bands of 140
La nucleus. This experiment is performed at
channel No.2 of Dalat Research Reactor (DRR), Prompt gamma neutron activation
analysis method (PGNAA) is used. The result has found 8 vibrational bands of 140
La nucleus. It‟s quite relevant to the theoretical calculation. The deviations are less than
1.6 %.
Keywords: Collective model, 140
La, vibrational band.
REFERENCES
[1] Aage Bohr - Ben R. Mottelson, Nuclear Structure, World Scientific Publishing, (1998)
[2] Larry Shelton Varnell, Beta and Gamma Vibrational bands in Deformed Nuclei, California
Institute of Technology, (1969)
[3] Yutaka Nakajima, Nobuyuki Ohnishi, Yukinori Kanda, Motoharu Mizumoto, Yuuki
Kawarasaki, Yutaka Furuta & Akira Asami, Radiative Neutron Capture in 139
La below 2.5 keV,
Journal of Nuclear Science and Technology, Vol. 20, (1983)
[4] R. Terlizzi et al, The 139
La (n, ) Cross Section, University of Hertfordshire, (2007)
[5] Zeev B. Alfassi, Prompt Gamma Neutron Activation Analysis with Reactor Neutrons, (1995)
[6] Ph m Ngọc Sơn, Ph t tri n dòng nơtron phin lọc tr n k nh ngang số 2 c a Lò phản ứng h t
nh n Đ L t, B o c o T ng kết ề tài nghiên cứu khoa học c p bộ, (2011)
[7] N. X. Hai - N. N. Dien - P. D. Khang - V. H. Tan - N. D. Hoa, A simple configuration setup for
Compton Suppression Spectroscopy, Cornell University Library, (2013)
[8] Nuclear Data Services (from International Atomic Energy Agency):
https://www-nds.iaea.org/pgaa/
174
P-85
MEASUREMENT OF IN-PHANTOM THERMAL NEUTRON FLUX
DISTRIBUTION IN DALAT RESEARCH REACTOR BORON
NEUTRON CAPTURE THERAPY BEAM LINE
Pham Dang Quyet1, Pham Ngoc Son
2 and Trinh Thi Tu Anh
1
1 Nuclear Engineering Department, Dalat University,
01-Phu Dong Thien Vuong, Dalat, Vietnam
2 Center for Nuclear Physics and Electronics, Nuclear Research Institute,
01-Nguyen Tu Luc, Dalat, Vietnam
E-mail: [email protected]
Abstract.
The present result of in-phantom thermal neutron flux distribution was measured by the
activation method using the filtered neutron beam at Dalat research reactor. Water has been
chosen for the inside of the phantom and 51
V standard foils have been used. The induced
activities in the irradiated samples were measured by a high resolution HPGe digital
gamma-ray spectrometer. The results of this study are also compared with those of other
studies.
REFERENCES
[1]. Kim, Myong Seop, Sang Jun Park, and Byung Jin Jun. “Measurements of in-phantom neutron
flux distribution at the HANARO BNCT facility”. Nuclear Engineering and Technology 36.3
(2004): 203-209.
[2]. Marashi, M. K. “Analysis of absorbed dose distribution in head phantom in boron neutron
capture therapy”. Nuclear Instruments and Methods in Physics Research Section A:
Accelerators, Spectrometers, Detectors and Associated Equipment 440.2 (2000): 446-452.
[3]. Bavarnegin, Elham, et al. “Measurement of in-phantom neutron flux and gamma dose in
Tehran research reactor boron neutron capture therapy beam line”. Journal of cancer research
and therapeutics 12.2 (2016): 826.
[4]. Al-Turiqi, Assem A. “Neutron activation boron therapy for cancer treatments”. Diss.
University of Surrey, 2009.
[5]. Sauerwein, Wolfgang AG, et al., eds. “Neutron capture therapy: principles and applications”.
Springer Science & Business Media, 2012.
[6]. Tan, V. H., and P. N. Son. “Thermal neutron radiative capture cross-section of 186
W (n, γ) 187
W
reaction”. Journal of Physics: Conference Series. Vol. 726. No. 1. IOP Publishing, 2016.
[7]. DeWerd, Larry A. “The Phantoms of Medical and Health Physics”. Springer, 2014.
175
P-86
CALCULATION AND SIMULATION OF THE TWO-PHASE FLOW
AND 3D VOID-FRACTION DISTRIBUTION IN THE BFBT
EXPERIMENTS USING ANSYS FLUENTCODE
Nguyen Thi Minh Sang1 and Nguyen Minh Tuan
2
1Dalat University, 01 Phu Dong ThienVuong, Dalat
2 Nuclear Research Institute, 01 Nguyen Tu Luc, Dalat
E-mail: [email protected]
Abstract:
BFBT (BWR Full-size Fine – Mesh Bundle Test), which are a series of experimental tests
in order to measure high resolution and full scale experimental characteristics of two-phase
flow in BWR fuel bundle under actual operating conditions, has been performed by
NUCPEC (Nuclear Power Engineering Corporation) of Japan, NRC (Nuclear Regulator
Commission) of the United States and OECD organization. This experimental database is
very valuable in understanding and verifying capabilities of calculation models of complex
two-phase flow that is used in thermal-hydraulics safety analysis. This
paperpresentstheresults ofcalculationssimulatingtwo-phase flowand 3D void-fraction
distributionin the BFBTexperiments usingANSYS FLUENT. The input data used in the
calculation were taken from the BWR Full-size Fine-Mesh Bundle Test Benchmark and
calculation results are compared with the experimental test data.
Keywords: BFBT (BWR Full-size Fine – Mesh Bundle Test), sub-channel, void-fraction,
grid spacer, boiling water reactor (BWR).
REFERENCES
[1] B. Neykov, F. Aydogan, L. Hochreiter, K. Ivanov, H. Utsuno, F. Kasahara, E.Sartori, M.
Martin, UPEC BWR Full-size Fine-mesh Bundle Test (BFBT) Benchmark, NUCLEAR
ENERGY AGENCY ORGANISATION FOR ECONOMIC CO-OPERATION AND
DEVELOPMENT, OECD 2006, NEA No. 6212.
[2] E. Krepper and R. Rzehak, CFD Analysis of a Void Distribution Benchmark of the NUPEC
PSBT Tests:Model Calibration and Influence of TurbulenceModelling, Hindawi Publishing
Corporation, Science and Technology of Nuclear Installations, Volume 2012, Article ID
939561, 10 pages.
[3] Wang-Kee In, Dae-Hyun Hwang, Tae-Hyun Chun, FD Simulation of the NUPEC BWR Full-
size Fine-mesh Bundle Test for a Void Distribution Benchmark, Transactions of the Korean
Nuclear Society Spring Meeting, Cheju, Korea, May 18-22, 2009.
[4] B. Koncar, E. Krepper, Y. Egorov, CFD Modelling of Subcooled Flow Boiling for Nuclear
Engineering Applications, International Conference, Proc. Nuclear Energy for New Europe,
Bled, Slovenia, September 5-8, 2005.
[5] http://www.arc.vt.edu/ansys_help/flu_tg/flu_tg.html
[6] http://www.arc.vt.edu/ansys_help/flu_tg/x1-47200028.9.html
176
P-87
STUDY ON THE EFFECTS OF METAL LAYER THICKNESS ON
RESPONSE FUNCTIONS OF BONNER SPHERE EXTENDED
SPECTROMETER BY MCNP CALCULATION
Mai Nguyen Trong Nhan1, Trinh Thi Tu Anh
2
1Department of Nuclear Engineering,
Ulsan National Institute of Science and Technology,
Republic of Korea
2The Research Management and International Cooperation Department, Dalat University, Vietnam
E-mail: [email protected]
Abstract.
The response functions of the Bonner Sphere Extended spectrometer were calculated using
MCNP program. For incident neutrons above 10MeV, tungsten was an excellent heavy
material as it yielded the highest response among tested materials. In addition, the
thickness of the heavy-metal layer had a considerable effect on the response. Based on
calculated results, recommended thickness for Bonner Sphere Extended spectrometers was
also presented. This study was valuable not only in understanding the behavior of Bonner
Sphere Extended Spectrometer but also provide data for future experiments.
Keywords: Bonner Sphere Extended spectrometer; Metal thickness; Response.
REFERENCES
[1] Brittingham, J. M. (2010). The effect of Bonner sphere borehole orientation on neutron detector
response. (Master thesis), The University of Tennessee. Retrieved from:
http://trace.tennessee.edu/utk_gradthes/775
[2] Burgett, E. A. (2008). A broad-spectrum neutron spectrometer utilizing a high energy Bonner
Sphere Extension. (Master thesis), The Georgia Institute of Technology.
Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/22888283
[3] Hector, R. V. C., Eduardo, G., Eduardo, M., & Alfredo, L. (2008). A Monte Carlo
calculation of the response matrix of a Bonner sphere spectrometer. Revista Mexicana de Fisica,
54(1), 57-62.
[4] Howell, R. M., Burgett, E. A., Wiegel, B., & Hertel, N. E. (2010). Calibration of a Bonner
sphere extension (BSE) for high-energy neutron spectrometry. Radiation Measurement, 45(10),
1233-1237.
[5] Ludlum Measurements. (2006). LUDLUM model 42-5. Retrieved from http://
www.qsl.net/k0ff/old files/1C Working Copy/yyy/LUDLUM MANUALS/M42- 5mar89.pdf
[6] Monte Carlo. (2003). MCNP5 Manual. Retrieved from https://www.nucleonica.com/
wiki/images/8/89/MCNPvolI.pdf.
[7] Shultis, J. K., & Faw, R. E. (2011). A primer for MCNP5. Manhattan, USA: Kansas State
University.
[8] Vylet, V. (2002). Response matrix of an extended Bonner sphere system. Nuclear Instruments
and Methods in Physics Research, 476(1-2), 26-30.
177
P-88
EFFICIENCY CALCULATION FOR PLASTIC SCINTILLATOR
IN IN-SITU BETA MEASUREMENT SYSTEM USING MCNP6
Mai Nguyen Trong Nhan1, Trinh Thi Tu Anh
2
1Department of Nuclear Engineering,
Ulsan National Institute of Science and Technology,
Republic of Korea
2The Research Management and International Cooperation Department, Dalat University, Vietnam
E-mail: [email protected]
Abstract.
The efficiency of plastic scintillator was calculated based on MCNP simulation, with
various thickness of the plastic scintillator layer taken into consideration. The plastic
scintillator was a good candidate in measuring high energy beta emitters (32
P or 90
Sr/90
Y).
However, poor counting efficiency was expected for 3H and
14C due to the short range of
beta in aqueous environment. Based on the energy deposition and the effect of gamma
rays/background, a thickness of 1mm of plastic scintillator was suggested for the up-
coming device.
Keywords: Beta rays, in-situ device, plastic scintillator, efficiency.
REFERENCES
[1] In-situ radiation detection demonstration, Stephen W. Duce, Amir H. Mohagheighi, Mark L.
Miller, Robert R. Reese and David R. Miller. WM‟00 Conference, February 27 – March 2,
2000, Tucson, AZ.
[2] T. Goorley, et al., "Initial MCNP6 Release Overview", Nuclear Technology, 180, pp298-315
[3] https://www.saint - gobain.co.jp /sites /default /files/download/ pdf/Crystal_ Organic_
Scintillation_ Materials_ Saint - Gobain. pdf
[4] Compendium of Material Composition Data for Radiation Transport Modeling R.G. Williams
III, C.J. Gesh R.T. Pagh, Pacific Northwest National Laboratory.
