Abstract Book FTEM 2015

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Programul celei de a XLIV-a Conferine Naionale

FIZICA I TEHNOLOGIILE EDUCAIONALE MODERNE

Iai 16 Mai 2015

800- 900nregistrarea participailor(Hol Sala L1)

900- 915 Festivitatea de deschidere a lucrrilorconferinei(Sala L1)

915- 945 Conferininvitat- Portretul unui tnrcercettori indicii bibliometrici -

Ovidiu CLUN(Sala L1)

Moderatori: Diana MARDARE, Cristian BABAN

1000- 1300ConferinePLENARE Didactici Cercuri tiinifice(Sala L1)

Moderatori: Dumitru ALEXANDROAIE, Cristian ENCHESCU,Cristian BABAN

1300- 1600Sesiunea postere (Hol Sala L1)

Moderatori: Mihai TOMA, Ioan DUMITRU, Cristian BABAN, Florin BRNZ,Dorina CREANG,Liviu LEONTIE, Silviu GURLUI

1600- 1630Festivitatea de premiere. nchiderea conferinei


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Didactic Preuniversitar i Didactic UniversitarAutori Titlu lucrare Tip

prezentareDU-I1 Ovidiu Florin Caltun Can a young researcher portrayed

be using bibliometric indicesInvited

DPU-O1 Drago Ttaru, Iuliana Dumitru,Ioana Ungureanu, Monica Grecu,Bogdan Grecu, Bogdan Zaharia,Sperana Tibu

Cutremurele i efectele lor opional cu tematic interdisciplinarpentru nivelul preuniversitar

Oral

DPU-P1 Caltun Ovidiu, Caltun Ioana Physics teachers' opinions oncooperation between universities andschools in developing commonactivities encouraging young people topursue a career in physics

Poster

DPU-P2 Bogdan Grecu, Dragos Tataru,Bogdan Zaharia, ConstantinIonescu, Speranta Tibu, Emil-SeverGeorgescu, Nicoleta Bican-Brisan

Seismology in Romanian schools:from kindergarten to high school

Poster

DPU-P3 Daniela Babusca Metode active de nvare aplicatela tiine

Poster

DPU-P4 Eduard Nastase, Dragos Tataru,Dragos Toma-Danila, AlexandraMuntean, Raluca Partheniu

New science education exhibitionopen to the general public

Poster

DPU-P5 Zina Violeta Mocanu, IonelMocanu

Modalitati moderne de abordare inprocesul de invatare si reusita scolara

Poster

DPU-P6 Ioniu Angela Apa curata pentru o viata sanatoasa(studiu de caza)

Poster

DPU-P7 Lacramioara Agavriloaei Macroconceptul de ferofluide Poster

DPU-P8 Lacramioara Agavriloaei Influenta ingrasamintelor mineralesolubile asupra continutului declorofila din frunzele de gladiola

Poster

DPU-P9 Laura- Iulia Anita, Delia Ciubotaru,Mara Strugaru

Metode active n predarea fizicii Poster

DPU-P10 Alexandru Vieru, Breaz RzvanVldu, Irina Dumitrascu

Expansiunea robotilor Poster

DPU-P11 Eliza Stan ElisabetaVictoria Popa

Meteorologia - Importana n viaade zi cu zi. Viscolul din 30.01.2014

Poster

DU-P1 Dumitru Manica, Ion Olaru, FlorinBrinza

Image analysis method fordetermining growth rate of the crystalsand structures

Poster


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DU-P2 Mihail Popa Determinarea rezistenelorechivalente ale circuitelor liniareinfinite

Poster

DU-P3 Mihail Popa Practicum de laborator la tema"Legea lui Arhimede i condiiile de

plutire a corpurilor"

Poster

DU-P4 tefan Adrian Rmbu, ConstantinCercel, Ctlin Agheorghiesei,Ionu Topal

Realizarea unui sistem simplu iieftin pentru determinri de absorbie aradiaiilor optice

Poster

DU-P5 Lucia Larisa Popescu , BogdanPeptine, Gabriel Oanca, DorinaCreanga

Mathematical modeling ofelectronic transitions of drugcompounds able to influence centralneural system practical applicativelesson for master students

Poster

Cercuri studenetiCS-O1 Cipriana Padurariu, Leontin

Padurariu, Lavinia Curecheriu,Carmen Galassi, Liliana Mitoseriu

The role of pore connectivity onferroelectric properties

Oral

CS-O2 Isabela Dragomir, Aurelia Apetrei Determinarea selectivitii ionice aunui nanopor hibrid format dintr-unpor proteic de -hemolizin i omolecul de ciclodextrin

Oral

CS-O3 Andreea Filip, Loredana Mereu Determinarea caracteristicilor unorpeptide antimicrobiene cu ajutorulunor sisteme lipido-proteice

Oral

CS-O4 Raisa Ioana Biega, Claudiu Costin,Lucel Sirghi

Simularea 3D a procesului dedepunere a straturilor subiri cu masccoloidal

Oral

CS-O5 Bogdan Butoi, Lucian Tudor, PaulDinca, Bogdan Bita, DamirMladenovic, Cezar Morarescu

Plasma Physics Students Club Oral

CS-O6 Emil Puscasu, Cosmin Mihai, LiviuSacarescu, Maria Andries, Claudia

Nadejde, Dorina Creanga, GabrielaVochita

Assessment of the biologicalimpact of some soft magnetic

materials on mammalian cell line

Oral

CS-O7 Adrian Bodnarescu, CiprianDariescu

Negative Curvature Universe witha Perfect Fluid Matter Source

Oral


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CS-O8 Adriana Neculcea, Marian Cozma,Andrei-Adrian Domocos,Alexandru Stancu

Mapping the Earth's magnetic fieldof populated zones

Oral

CS-O9 Adrian Oanea 3D printing applications Oral

CS-P1 A. Hrib, F. Iacomi, O. Marincas Analizele spectrale i autentificarean art

Poster

CS-P2 Alice Grigoriu Studiul curentilor electrici printesuturi biologice expuse actiuniijetului de plasma la presiuneatmosferica

Poster

CS-P3 Vlad-Alexandru Lukacs, MirelaAirimioaei , Liliana Mitoeriu

Microstructuri unidimensionalebiomimetice de oxid de nichel. Sintezi caracterizare

Poster

CS-P4 Ion Creanga, Dan Mihailescu Monte Carlo Commissioning of aLinear Accelerator for IntraoperativeRadiation Therapy

Poster

CS-P5 Cristina Gerber, George BogdanRusu, Ionut Topala

Gravura filmelor de biomoleculeprin expunere la actiunea plasmei lapresiune joasa

Poster

CS-P6 Andreea-Celia Benchea, DanaOrtansa Dorohoi

Consideratipon on somepharmaucetical compounds used forcolds and flu

Poster

CS-P7 Laura Hrostea, Mihai Dumitras,Liviu Leontie

Study on the degradation behaviorand stability of some polymers using

thermal analysisi

Poster

CS-P8 Bianca Cristiana Hodoroaba, StefanAndrei Irimiciuc, Georgiana Bulai,Cristian Focsa, Silviu Gurlui

Studiul plasmei de ferita de cobaltprodus prin ablaie laser

Poster

CS-P9 Daniel Stefan, Diana Neagu,Andreea Gavrilescu, Iulia Barbut,Bogdan Butoi

GLAD technique in plasmapolymerization. Influence of substrateposition

Poster

CS-P10 Francisca Husanu, GeorgianaBulai, Mariana Pinteala, CristianFocsa, Silviu Gurlui

Studiul nanoparticulelor de feritde cobalt obinute prin ablaie laser nlichid

Poster

CS-P11 Oana Daciana Botta, LoredanaAngelica Mare, Octavian Dnil

Observation on controlled dampingin gold nanoparticles - doped opticalwaveguides

Poster


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CS-P12 O. Vasilovici, V. Tiron, C. Costin,L. Sirghi

Tuning the band gap energy ofZnO:N thin films obtained by HiPIMStechnique

Poster

CS-P13 Oana Rusu, Liviu Leontie, BogdanAlbina, Anca Irina Popescu,

Andreea Teodor, Adrian Timofte,Gina Tiron, Marius Mihai Cazacu,Silviu Gurlui

Monitorizarea factorilor de mediuin zona de agrement Ciric in vederea

identificarii intruziunilor de poluanti

Poster

CS-P14 Dana Simiuc, Corina Ciobnau,Aurelia Apetrei, Tudor Luchian

Investigarea interaciunii dintrepeptida magainina 2 i veziculeunilamelare gigant cu ajutorulmicroscopiei confocale

Poster

CS-P15 Grigore rn Metode de analiz ale proceselorde ciocnireproton-protonla 14 TeV.

Poster

CS-P16 Maria Andries, LacramioaraOprica, Emil Puscasu, Florin

Brinza, Andrei Domocos, ClaudiaNadejde, Emilia Creanga

Impact of cobalt ferritenanoparticles on the metabolism of

some cellulolytic fungi

Poster

CS-P17 Oana uu, Mihai Dumitra, LiviuLeontie

Metode de analiz termic.Caracteristici ale unor mono- ipolizaharide determinate prin metodatermogravimetriei i prin metodacalorimetriei difereniale

Poster

CS-P18 Madalina Iftime, Marius-MihaiCazacu, Bogdan Albina, Sorin IoanStratulat, Silviu Gurlui

Exposomul: un nou conceptprivind studiile impactului calitiimediului atmosferic asupra sntii

Poster

CS-P19 Luiza Budeanu, Horia Chiriac,Nicoleta Lupu Magnetic and structuralcharacterization ofFe73.5Cu1Nb3Si15.5B7powders obtainedby ball milling process

Poster

CS-P20 Lucian Cosovanu Structure and Evolution of the Sun-like stars

Poster

CS-P21 Andrei Ciuca, Vasile Tura, DanMihailescu

Depolymerisation of chitin bydeuteron beam irradiation

Poster

Bogdan Albina, Marius-MihaiCazacu, Adrian Timofte, SilviuGurlui

Preliminary Analysis of the FirstMeasurements at the NewAERONETs Iasi Site

Poster

CS-P22 Adrian Trandafir, Ana MariaTrandafir, Mihai Gru

Computer simulation of the energyspectra of various bipyridine- andphenanthroline-based ligands for dye-sensitized solar cells

Poster


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CS-P23 Alin Marian Apetrei, AliciaPetronela Rambu, Evelina Tarcuta,Sorin Tascu

Dispersive properties of onedimensional array of Lithium Niobatewaveguides

Poster

CS-P24 Vasilica Gafton, Georgiana Bulai,

Ioan Dumitru, Sophie Cervera,Martino Trassinelli, DominiqueVernhet, Ovidiu Florin Clun

Characterization of zinc ferrite

nanostructures irradiated by slowhighly charged ions

Poster

CS-P25 Raluca-Maria Stan, Roxana Gin,Cristian Enchescu

Static and kinetic parts in LITHspin crossover compound

Poster

CS-P26 Cosmina Denisa Danilet, MariaHerea

Studiul proprietilor de transportale porului proteic transmembranarde-hemolizin prin tehnici deelectrofiziologie i microscopieconfocal

Poster

CS-P27 Ana Barar, Octavian Danila Recent oled technology advancesand applications Poster

CS-P28 Oana-Andreeea Condurache, Ana-Maria Hanganu, Giovanna Canu,Lavinia-Petronela Curecheriu,Liliana Mitoeriu

Preparation and characterization ofBaCexTi(1-x)O3ceramics

Poster

CS-P29 Cristin Petrica Constantin,Anamaria Constantin, ElenaLeanca, Alexandra Roxana Baicu,Ovidiu Florin Caltun

Artefactele metalice in CT si RMN Poster

CS-P30 Cristin Petrica Constantin,Anamaria Constantin, ElenaLeanca, Alexandra Roxana Baicu

Evaluarea ecranelor deradioprotectie pentru o instalatie CT

Poster

CS-P31 Ana-Maria Andrei, IordanaAtefnoaei, Alexandru Stancu

Magnetic hyperthermia:conceptand reason in the cancer therapy

Poster

CS-P32 Vlad Preutu, Mirela Airimioaei Prepararea i studiul proprietilorfuncionale ale unor materialecompozite pe baz de PCL i

nanoparticule feroelectrice

Poster

CS-P33 Crenguta Bacaoanu, TeodoraTeslaru

Comparative study of effectsinduced by UV radiations and plasmaon poly(methylmethacrylate) films

Poster


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CS-P34 Raluca-Maria Stan, Roxana Gin,Mdlina Dorneanu, Andrei-AdrianDomoco, Adrian Onea, LaviniaCurecheriu

Preparation and characterization ofPLZT ceramics with antiferroelectric-ferroelectric crossover

Poster

CS-P35 Andreea Teodor, Irina Anca

Popescu, Tudor Luchian, EmiliaDorina Creanga

Expunerea la radon Poster

CS-P36 Irina Anca Popescu, AndreeaTeodor, Tudor Luchian, EmiliaDorina Creanga

Protecia radiologic n expunereaprofesional i medical din proceduriradiodiagnostice

Poster

CS-P37 Andreea Teodor, Irina AncaPopescu, Andreea Grigorescu,Tudor Luchian, Dorina EmiliaCreanga

Expunerea populaiei la sursenaturale radioactive

Poster

CS-P38 Samir Taloub, Farida Hobar,

Iordana Astefanoaei, Ioan Dumitru,Ovidiu Florin Caltun

Size distribution and surface

coating effect on MagneticNanoparticles for therapeuticapplication

Poster


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Abstracte Conferina NaionalFIZICA I TEHNOLOGIILE EDUCAIONALE MODERNE XLIV - Iai

11

Can a young researcher portrayed be using bibliometric indices

Ovidiu Florin Caltun1

1Faculty of Physics, Alexandru Ioan Cuza University, Iasi, Romania

The case study using bibliometric indices known as the h index, index , hnorm index, g index, hcontemp , the average number of citations per article, cooperation and citations maps try to discuss theprofessional evolution of young scientists that have defended the Ph. D. at Faculty of Physics of Iasi.The paper resumes the skills that are required for a PhD and how it can be supported for the professional

insertion and evolution. The study is based on the hypothesis that bibliometric indexes used in acoherent and consistent way can contribute to portraying a young researcher and can drive the trainingprogramme and/or anticipate how the scientist will evolve in career if he will find an researchenvironment that drive the development of skills, motivation and attitude. The first part of the work is aninventory of skills that a young researcher must demonstrate to be admitted at doctoral studies, as PhDcandidate, and then the skills that a Postdoc Fellow must to demonstrate to be accepted by an academicor research institute. The author's views are detailed on how these skills can be mirrored by bibliometricindices and are offered some examples from records obtained from the database Web of Science forapproximately 170 early career researchers registered in the last ten years at Doctoral School of Physics.

The study demonstrates that it can establish correlations between bibliometric indices, co-autoratorshipand citation maps and level of the competencies of young researcher. The analysis is significant atinstitutional (regional) level but can be a good example for an analysis at national level of the Ph. D.study quality. In the context of encouraging European researcher mobility HERA and the trends inapplication of performance standards in the EU countries the paper try to give answers to somequestions and make some recommendations on the harmonization of approaches encouraging the youngresearchers' career development of and increased dynamic of bibliometric indices in a researchinstitution.

[1] M. Kosmulski, Family-tree of bibliometric indices, Journal of Informetrics 7 (2013) 313 317

[2] French Academy report On the proper use of bibliometrics to evaluate individual researchers, 2011


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12

Cutremurele i efectele lor opional cu tematic interdisciplinar pentru nivelul preuniversitar

Drago Ttaru1, Iuliana Dumitru2, Ioana Ungureanu3, Monica Grecu4, Bogdan Grecu1, Bogdan Zaharia1,Sperana Tibu5,1

1Retea Seismica, Institutul National de CD pentru Fizica Pamantului, Magurele, Romania

2Profesor, Liceul Teoretic Decebal, Constana, Romania

3Profesor, Liceul Teoretic Horia Hulubei, Mgurele, Romania

4Educator, Grdinia 178, Bucureti, Romania

5Laborator Consiliere i Management Educaional, Institutul de tiine ale Educaiei, Bucureti,

Romania

Cutremurele de pmnt sunt considerate unele dintre cele mai distrugtoare fenomene naturale,producnd pierderi fizice, socio-economice i culturale. Efectele acestora sunt agravate de lipsacunotinelor, a comportamentelor i a atitudinilor necesare pentru a ne proteja n faa acestor fenomenenaturale [1]. colile sunt cele care au un rol foarte important n a oferi cadrul necesar educaiei idezvoltrii generaiilor viitoare. O educaie corespunztoare n coli nu const doar n a transmiteinformaii elevilor, ci i n a ptrunde mai adnc n contiina comunitii din care acetia fac parte, prinintermediul prinilor i al profesorilor. ndeosebi elevii din nvmntul pre-universitar ntmpindificulti de nelegere a ideilor i conceptelor tiinifice despre cutremure din cauza lipsei de coerenn organizarea i structurarea informaiilor primite n coal: acelai fenomen fiind abordat la discipline

i sub aspecte diferite, ns fragmentar i fr o nelegere unitar. ncercnd s depeasc dificultileexpuse mai sus, proiectul ROEDUSEIS Reeaua Seismica Educaional din Romnia(www.roeduseis.ro) propune o abordare inovativ, integrat i, conform studiilor de necesitate derulate,pe deplin justificat i necesar. Mai exact, unul din obiectivele proiectului este elaborarea iimplementarea unui opional interdisciplinar particularizat pentru ciclurile primar, gimnazial si liceal,intitulat Cutremurele si efectele lor [2]. n cadrul opionalului, noiuni specifice geografiei i fiziciiofer suport pentru nelegerea fenomenului, iar metodologia propune o abordare activ-participativfocalizat pe observaie i experimente simple, astfel nct s se respecte nivelul de nelegere alelevilor, interesele i ritmul de nvare specifice vrstei. Conceperea, realizarea i folosirea unorinstrumente simple de observare sau msurare dezvolt abilitile elevilor n ceea ce privete analiza,compararea, descoperirea, experimentarea, simularea i reflexia critic asupra problematiciicutremurelor (cauze, msurare, schimbri pe care le aduc mediului nconjurtor, msuri de prevenire isiguran).

[1] Paton, Douglas, and David Moore Johnston, eds. Disaster resilience: an integrated approach[2] Zaharia B., Ttaru D., Borleanu F., Brian N., Georgescu E. S. - Despre cutremure i efectele lor.Caietul profesorului/ elevului


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13

Physics teachers' opinions on cooperation between universities and schools in developing commonactivities encouraging young people to pursue a career in physics

Ovidiu Florin Caltun1 , Ioana Caltun2


European Network Horizons on Physics Education (HoPE) has between the wLickert)ork objectivesidentifying good practice in cooperation between Secondary Schools and Universities in organizingevents and actions inspiring young people to choose a career in Physics. Among other actions one was

to ask the opinions of those who work in universities and secondary schools on the level of cooperationin such activities is. A structured questionnaire was conducted on four categories of items described by5 levels of satisfaction (Lickert scale). The first category refers to cooperation in between Schools -Universities - Reserch Institute in general and focused on the institutions' strategy, their involvementand financial support of stakeholders. The second category of items addressed the opinions on scholarscompetitions and contest in Physics. Here teachers' opinions were requested on the type of contests thatshould be encouraged because it represents good practice. A third target different type of cooperationwas events such as the popularization of science, public events, visit of the laboratories in universities,etc. A final category of items referred to the training programs offered to Physics teachers. The paperdiscusses the results of the investigation undertaken directly and via email. Statistics andrecommendations are made.

http://hopenetwork.eu/content/inspiring-young-study-physics


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14

Seismology in Romanian schools: from kindergarten to high school

Bogdan Grecu1, Dragos Tataru1, Bogdan Zaharia1, Constantin Ionescu1, Speranta Tibu2,1, Emil-SeverGeorgescu3, Nicoleta Bican-Brisan4

1Romanian Seismic Network, National Institute for Earth Physics, Magurele, Romania

2Counseling and Educational Management, Institute for Educational Sciences, Bucharest, Romania

3Seismic Risk Assessment and Actions in Civil Engineering, National Institute for Research and

Development in Construction, Urban Planning and Sustainable Spatial Development, Bucharest,

Romania4Faculty of Environment Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania

Romania is one of the European countries most affected by earthquakes. The main threat comes fromVrancea region, a peculiar zone located at the sharp bend of the Southeast Carpathians whereearthquakes are generated in a narrow focal volume at intermediate-depths (60 220 km). The Vranceaearthquakes can be very large and cause a lot of damage and loss of lives. For example, the 4 of March1977, Mw = 7.4 event killed more than 1570 people, injured 11300 persons, caused the collapse of 33tall buildings in the Romanian capital, Bucharest and resulted in economic losses well in excess of US$2 billion. Thus, it is very important that the Romanian people understands the earthquake threat inRomania, how to behave during earthquakes to minimize personal risk and how to secure home, schoolor/and work environments to minimize injuries, deaths and economic losses from strong earthquakes.

One way to achieve these goals is to introduce seismology in schools and to educate the children usingaccessible educational materials, proper tools and excellent resources for classroom-based experiments.The Romanian Educational Seismological Network (ROEDUSEIS) project is the first educationalinitiative in Romania in the field of seismology involving two research institutes (the National Institutefor Earth Physics as coordinator, the National Institute for Research and Development in Construction,Urban Planning and Sustainable Spatial Development), one university (the Babe-Bolyai University-Faculty of Environmental Sciences and Engineering) and one private company in software developing(Beta Software). ROEDUSEIS is focused on increasing the level of knowledge of teachers and pupils onearthquake phenomena, earthquake effects, preparedness measures and is also promoting the role ofeducation and schools in disaster risk reduction. The main educational objectives are to develop new andcomprehensive educational materials, familiarize the students and teachers with seismological data andtrain them how to analyze and interpret these data, planning, designing and testing didactic activitiesbased on the concept learning by doing. This work outlines the first results of the project related to itseducational objectives.


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15

Metode active de nvare aplicate la tiine

Daniela Babusca1,2

1Fizica, Scoala Al. Vlahuta , Iasi, Romania

2Optica si spectroscopie, Univ. Alexandru Ioan Cuza , Iasi, Romania

Promovarea nvrii active presupune i ncurajarea parteneriatelor n nvare. In fapt, adevratanvare, aceea care permite transferul achiziiilor n contexte noi este nu doar simplu activ, individualactiv ci interactiv. Dac n didactica tradiional, predarea nseamn transmitere de cunotine,nvarea presupune asimilare i reproducere de cunotine, iar evaluarea este predominantcantitativa;n viziunea modern predarea nseamn organizare optim a situaiilor de nvare, nvareapresupune construirea prin implicare personala a sensului unor cunotine, descoperirea unor soluii, iar

evaluarea este calitativ.

Lucrarea de fa ii propune s evidenieze cteva dintre avantajele folosirii metodelor creative, degndire critic, a proiectului Intelteach n procesul educativ.

[1] Cosmovici, Andrei, Iacob,Luminia(coord), Psihologie colar, Editura Polirom, Iai, 2005


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16

New science education exhibition open to the general public

Eduard Nastase1, Dragos Tataru1, Dragos Toma-Danila1, Alexandra Muntean1, Raluca Partheniu1

1Romanian Seismic Network, National Institute for Earth Physics, Magurele, Romania

Romania is a very active country from a seismological point of view, but not too reactive when itcomes to diminishing the possible effect of a major earthquake. Project MOBEE (MOBile EarthquakeExhibition) plans to make a change regarding the approach to this subject, by using the power ofinformation and non-informal education. This project is singular in Romania and it is intended forgeneral public use, regardless of age, experience, financial status or even residence. In a nutshell, itsupposes transmitting current reviewed pieces of information, regarding the definition of earthquakes,the way natural hazards can affect us and the measures to be taken for prevent an aftermath, by using

modern technologies, exhibits, interactive activities and involving interaction between scientists andthe general public. The MOBEE Project intends to tackle a very problematic topic for the present andfuture of Romania: the quality of education, in the perspective of a future major earthquake.

And not just in a declarative, formal way, but in a practical manner, by translating modern approachesin science, arts and technology into end-products with a direct impact in forming and developing theinterest for earth science, at different levels and at a significant scale. Improving public awareness andeducation of the population is an essential part of mitigating the natural risks. Starting this endeavour atthe level of schools and also opening the doors for the general public to take part, it will certainly be away to increase the chances of success. Our view is that the research institutes should have a leadingrole in providing useful data regarding the earthquakes, thus helping the better understanding of thisnatural phenomenon, and thus bring its contribution to build a more resilient society.


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17

Modaliti moderne de abordare n procesul de nvare i reuita colar

Zina Violeta Mocanu1, Ionel Mocanu2

1Fizica, Liceul tehnologic Ion Mincu , Vaslui, Romania

2Matematica-Fizica, coala Gimnazial "Theodor Rosetti" Soleti, Vaslui, Romania

n ultimele dou decenii, interesul fa de tiine a sczut tot mai mult, deoarece programele,coninuturile i metodele sunt nvechite, bazate pe memorare, cu accent pe reproducere, total inadecvateepocii exploziei informaionale. n Romnia n ultimii 40 ani au avut loc dou modificri aleprogramelor colare (1978 i 1997) astfel nct astzi avem programe care nu in cont de gradul de

perimare i interes a unor informaii, de faptul c numrul de ore alocate fizicii sau matematicii ausczut, coninuturile rmnnd aproape aceleai. Facultatea de Fizica a Universitii Bucureti mpreuncu Societatea Romn de Fizic a oferit profesorilor de fizic cursul Metode eficiente de nvare afizicii i a pus la dispoziia acestora o varietate de resurse pe plat forma http://rpfip.srfizica.ro:85/coursecare vizeaz modaliti eficiente de abordare a nvrii. n acest sens am realizat un studiu comparativprivind nivelul de competene i achiziii atinse de elevi pe diferite teme din program, abordate fie prinmetode tradiionale, studiu individual, fie prin metode noi (nvare prin proiecte,lucru pe grupe, etc).Cercetarea la Matematica i la cursul opional Matematic aplicat s-a fcut pe 30 elevi de clasa aVIII-a de la coala Gimnazial "Theodor Rosetti" Soleti-Vaslui, iar la Fizic i la cursul opionalFizic i tehnologii moderne pe programelor colare 22 elevi de clasa a IX-a de la Liceul tehnologic

Ion Mincu Vaslui. S-au constatat urmtoarele: -gradul de implicare al elevilor este mai mare ilucrrile realizate sunt mai bune la disciplinele opionale, discipline care au coninuturi de interes pentruelevi i de actualitate; -lucrul n echip a produs idei novatoare i a stimulat creativitatea; -un procentnsemnat din elevii studiai acceseaz sursele de informare indicate ( i nu numai); -tot mai muli elevirspund negativ la instruirea prin metode tradiionale; - un numr mare de elevi refuz s maimemoreaze formule, algoritmi, operaii, dar gsesc soluii folosind calculatorul. Soluia de evitare aeecului colar ar putea fi regndirea programelor colare i a metodelor de lucru cu elevii.

Motivation and learning physics,H E Fischer,M Horstendahl, Research in Science Education,Volume27, Issue 3, pp 411-424


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18

Ap curat pentru o via sntoas (studiu de caz )

Ioniu Angela

coala Gimnazial Golieti Jud. Iai

Apa, element esential i indispensabil mentinerii vietii pe pmnt, constituie astzi unul din subiectelecele mai controversate la nivel mondial. Polurea mediului nconjurtorare repercursiuni asupra calittiii snttii plantelor, animalelor i a oamenilor. Prin poluarea apei, se ntelege alterarea caracteristicilorfizice, chimice si biologice ale apei, produs direct sau indirect de activittile umane i care face caapele s devin improprii utilizrii normale. Activittile propuse n acest proiect au vizat mbunttirea

perspectivei pe care o au membrii comunittii asupra importantei pstrrii apelor curate pentruasigurarea unei vieti sntoase. Obiectivele urmrite n acest proiect au fost: 1) Identificarea unorcompui i agenti poluanti din apa potabil(din fntni), din diferite puncte de pe raza comuneiGolieti; 2) Analiza chimic(calitativ)i fizic(activitatea conductoare a apei)din probele de ap; 3)Trezirea unor institutii:Primaria Comunei Golaiesti, Univ.Al.I.Cuz Iai(Fac.de Fizc si Fac.de Chimie);4) Prezentarea rezultatelor obtinute la nivelul colii,precum i la nivel international n cadrul proiectuluiWater connects; Rezultatele obtinute pe parcursul proiectului au fost:identificarea unor compui chimicin cantitti relativi mari n apa studiat;activitatea dielectrica a apei este ridicat datorit prezentei

ionilor ce favorizeaz conductia apei; valorile pH-lui se ncadreaz n limita pH-lui slab acid.Dac apaar fi avut un pH-bazic ar fi dovedit un continut ridicat de nitriti i sruri. Cercetrile t iintifice realizate

n acest proiect dovedesc c parametrii de caliate a apei de pe teritoriul comunei se ncadreaz n limiterelativ normale. Depozitarea deeurilor n apropierea surselor de ap,deversrile i scurgerile desubstante lichide provenite din gospodrii i ferme de animale,fertilizarea solurilor i utilizareapesticidelor vor conduce la degradarea calittii apelor din pnza freatic precum i din rul Jijia. Solutiipropuse: o mai bun informare a populatiei cu privire la pstrarea apelor curate;aplicarea legislatiei nvigoare privind protectia apelor;implicarea elevilor n activitti de ecologizare si concursuriinterdisciplinare.


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Macroconceptul de ferofluide

Lacramioara Agavriloaei1

Scoala Gimnaziala "D. D. Patrascanu", Tomesti, Iasi, Iasi, Romania

Trim ntr-o lume aflat ntr-o permanent schimbare, benefic, pozitiv, ns acestei schimbri rapide iputem face fa doar dac neadaptm resursele materiale i umane existente n prezent la noile condiiicare ni se impun n diverse domenii: cultural, social, tiinific, tehnic etc. Oamenii de tiin ncearc npermanen s descopere, s inoveze noi materiale care vor schimba, modifica, transforma sau

mbunti tehnologiile actuale. Cercettorii din zilele noastre gsesc noi modaliti de manipulare a

materiei la o scar tot mai mic, inspirndu-se din ce n ce mai mult dup natur, dup mediulnconjurtor, cunoscut fiind faptul c natura ne ofer cele mai frumoase, reale i utile modele pe care leputem aplica n domeniile noastre de cercetare. Noile materiale existente astzi, care par desprinse dincri sau filme SF, nu sunt doar curioziti tiinifice, ci sunt utile n adevratul sens al cuvntului nmultiple domenii de cercetare i dezvoltare economic. Un astfel de exemplu este ferofluidul sau fluidulmagnetic, care este un fluid constituit din particule coloidale (n stare de dispersie, care nu difuzeazprin membrane) feromagnetice, ferimagnetice sau paramagnetice suspendate intr-un lichid. Acestefluide sunt practic metale lichide capabile s-i schimbe forma, ns, la baza acestei abiliti stconinutul ridicat de microparticule de magnetit, hematit sau oricare alt compus al fierului, dispusuniform ntr-un lichid. Aceste minunate particule, care au o dimensiune medie de aproximativ 10

nanometri (1 x 10-6 cm), sunt acoperite cu un agent de stabilizare ce mpiedic aglomerarea particulelor,chiar i atunci cnd un cmp magnetic puternic este aplicat ferofluidului. Astfel, ntregul lichid devinemagnetic, configurabil ntr-o infinitate de forme. Macroconceptul de ferofluide a fost un proiecteducaional local n domeniul tiine, proiect aplicat la nivel de gimnaziu n unitatea de nvmnt dinmediul rural, coala Gimnazial D. D. Ptrcanu, Comuna Tometi, Iai.

www.nexusbz.ro/curs2.pdf www.academos.ro/.../cum_se_scrie_un_proiect_de_cercetarewww.scritub.com/.../Etapele-proiectului-de-cerceta338


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Influenta ingrasamintelor minerale solubile asupra continutului de clorofila din frunzele degladiola

Lacramioara Agavriloaei1

Scoala Gimnaziala D. D. Patrascanu , Iasi, Romania

Scopul lucrrii de fa a fost studiul influenei ngrmintelor minerale solubile (NH4NO3, KNO3)asupra coninutului de clorofil din frunze i realizarea unor experimente, observaii i analize de ordinmorfologic i chimic la specia Gladiolus hybridus. S-au luat n studiu cteva soiuri de Gladiolus xgandavensis, un hibrid provenit din ncruciarea speciilor Gladiolus cardinalis i Gladiolus psittacinus.

Materialul vegetal l-a constituit ntreaga plant la care s-au observat toate organele (vegetative ireproductoare) sub influena ngrmintelor minerale solubile (NH4NO3, KNO3). Cult ivarea plantelorsub influena ngrmintelor minerale solubile (NH4NO3, KNO3) a fost realizat n perioada aprilie octombrie 2014, iar colectarea lor s-a fcut la 20 octombrie 2014 n stadiul final de dezvoltare (rdcin,tulpin, frunze i floare), pornind de la organele vegetative de nmulire, bulbotuberculi (carenmagazineaz substanele hrnitoare), apoi, acest material vegetal a fost utilizat n laboratorul

Universitii Al. Ioan Cuza, Iai, pentru determinarea coninutului de clorofil la spe cia Gladiolushybridus. Pentru determinarea cantitii de pigmeni clorofilieni din materialul biologic a fost aplicatmetoda Mayer Bertenrath. Clorofila este unul dintre pigmenii fotosensibili implicai n fotosintez.Clorofila reprezint un complex chelatic cu Mg 2+ ca ion central i un sistem tetrapirolic (feofitina) ca

ligand, ce cuprinde legturi duble conjugate, respectiv gruprile cromofore. S -au identificat mai multeclorofile (a, b, c, d), care se deosebesc ntre ele prin gruprile grefate pe ciclul porfirinic (fig. 1 i fig. 2 -https://www.google.ro/search=clorofila+a&b). Dintre acestea, clorofila a este singurul pigment comuntuturor plantelor verzi capabile s realizeze fotosinteza i s transfere n mod direct energia sa reacieifotosintetizante.

https://www.google.ro/search=clorofila+a&b


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Metode active n predarea fizicii

Laura- Iulia Anita1, Delia Ciubotaru1, Mara Strugaru1

1Facultatea de Fizica, Universitatea Alexandru Ioan Cuza, Iasi, Romania

Programele actuale la disciplina FIZIC pun accent pe instruirea centrat pe elev. Pentru c plictisealai dezinteresul nu sunt o fatalitate, i elevii pot experimenta entuziasm n activitatea de nvare lacoal, numeroase metode noi de predare i organizare a instruirii au fost iniiate de ctre profesoridoritori s treac de la o pedagogie frontal, la una mai activ i diversificat. Prezentm dou metode,linia valoric i cvintetul, care au mai multe obiective: s mbine procesul de asimilare cu cel de

acomodare, s dea sens i coeren coninuturilor, s dezvolte autonomia elevilor, s valorizeze gusturilei aptitudinile, s dezvolte creativitatea. Aceste metode deschid noi drumuri n nvare: elevii iconfrunt ideile, iau cuvntul n public, conduc o dezbatere, analizeaz informaiile, i permit realizareaunui dialog educativ. Linia valoric. Rzboiul curenilor Thomas Alva Edison sau Nikola Tesla Liniavaloric este o metod de nvare modern ce stimuleaz gndirea critic a elevilor prin colaborare iformularea unor preri personale, originale.Dezbaterea va cuprinde enumerarea avantajelor idezavantajelor fiecrui tip de curent i argumente pentru susinerea celor doi fizicieni.Susintorii luiThomas Edison pot susine urmtoarele: curentul alternativ este foarte periculos, demonstrnd asta prinelectrocutarea animalelor i execuii pe scaunul electric. Ali elevi sustin invenia lui Nikola Tesla,curentul alternativ, prin micorarea pierderilor n cazul transportului n siguran pe distane mari, ddea

o lumin alb, constant. Cvintetul Termenul semnific o poezie cu cinci versuri. Se pornete de la unsubiect propus spre discutare, care s se reflecte n singurul cuvnt -cheie de pe primul rnd. Pe al doilearnd, se scriu dou adjective care se refer la cuvntul cheie. Pe al treilea rnd, se scriu trei verbe lagerunziu. Al patrulea vers este format din patru cuvinte care exprim sentimentele elevului fa deproblema, subiectul n cauz. Ultimul vers sintetizeaz esenialul, ntr-un cuvnt.Un exemplu pentrulecia elemente de circuit : Rezistena Ohmic, metalic Opunndu-se, ncalzindu-se, modificndu-seEste un element important n circuit.

[1] Meirieu P., Apprendre oui, mais comment?, ESF, Paris, 1993 2. Pelpel P., Se former pourenseigner, Dunod, Paris, 2003


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Expansiunea robotilor

Alexandru Vieru1, Breaz Rzvan Vldu1, Irina Dumitrascu1

1Colegiul Economic Anghel Rugin, , Vaslui, Romania

Dezvoltarea economic,creterea puterii de calcul computerizat, cercetrile din domeniul bionicii i albiofizicii au permis dezvoltarea, fr precedent, a roboticii. Tendinele actuale arat c, n viitorulapropiat, vom asista la o adevrat invazie a roboilor n spaiul public i n spaiul privat. Dincolo deprogresul economic, ns, ascensiunea roboilor amenin viaa social i familial cu mutaiiimportante. In ultimul deceniu, roboii au ptruns i n spaiul serviciilor. Roboii pentru serviciipersonale, ntr-o cretere semnificativ n ultimii ani sunt utilizai n cas la splatul vaselor, la tundereagazonului sau ca jucrii pentru copii. Se mai pot folosi n prevenirea i soluionarea situaiilor de urgen

i n domeniul combaterii aciunilor teroriste, misiunile fiind diversificate s-au realizat roboi careutilizeaz preponderent propulsorul enilat, platformele uzuale cantrind 50...125 kg.

Meteorologia Importana n viaa de zi cu zi. Viscolul din 30.01.2014

Eliza Stan Elisabeta, Victoria Popa

Liceul Teoretic Decebal Constana

Prognoza meteo este foarte util, de multe ori chiar esenial n activitile umane. Aceasta permiteanticiparea din timp a evoluiei unor parametri, ca: temperatura aerului, presiunea atmosferic, viteza idirecia vntului, precipitaiile, etc, fapt care permite tuturor celor care desfaoar diverse activiti sa-iadapteze aciunile n funcie de vreme si de evoluia ei.

Dat fiind acestea, considerm c avantajul timpurilor noastre este fr ndoial faptul c tiina i noiletehnolgii informaionale ne permit omai bun urmrire a comportamentului schimbtor al strii vremii.Avnd n vedere c oraul nostru dispune de un Centru Regional de Prevedere a Vremii am avutprivilegiul de a-l vizita i de a putea culege cteva informaii n legtur cu analiza sinoptic a vremii.

Actuala lucrare are n vedere stimularea curiozitii elevilor asupra fenomenelor meteorologice iprezentarea unor noiuni de meteorologie ce in de prognozarea timpului. n afar de aceasta, amncercat s prezentm un caz real de fenomen periculos i modul n care meteorologii au atenionatpopulaia asupra acestuia. Specificm c datele meteorologice i diagramele din lucrare ne-au fost pusela dispoziie de ctre Centru Regional de Prevedere a Vremii Dobrogea.


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Image analysis method for determining growth rate of the crystals and structures

Dumitru Manica1, Ion Olaru2,1, Florin Brinza1

1Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania

2Faculty of Exact, Economic and Environmental Sciences, Alecu Russo State University of Balti, Balti,

Republic of Moldova

During some laboratory experiments is necessary to know the formation rate of different kind ofnucleated specimens: single crystals, electrodeposited structures, sedimented products. This speed -formation rate- is linked to other experiment parameters: temperature, concentration, density of currentetc. For speeds exceeding human reaction is difficult to measure this parameter directly. Based on theimage process progress recorded at normal speed (30 fps) or high recording speed (1000 fps or better),the proposed method use a open-source software analysis tool in order to calculate the growth speedfrom solution for an mineral crystal. Obtained results, errors sources and future application are

presented.

1. Tarjan, I., Matrai, M., Laboratory manual on crystal growth. Akademiai Kiado, Budapest, 1972.2. Tracker 4.87. Copyright (c) 2015 Douglas Brown. http://www.cabrillo.edu/~dbrown/tracker/

Determinarea rezistenelor echivalente ale circuitelor liniare infinite

Mihail POPA1

1Department of Physical Sciences and Engineering, Alecu Russo State University, Balti, R.Moldova

Din categoria problemelor cu grad sporit de dificultate un rol aparte l ocup problemele de calcul alerezistenelor echivalente ale circuitelor electrice liniare infinite. De obicei, aceste circuite sunt simetricei n multe cazuri conin aceleai elemente (de obicei, rezistori sau grupri de rezistoare). Problemele deacest tip se clasific n trei categorii mari: - liniare (unidimensionale); - superficiale (bidimensionale); -volumice (tridimensionale). Pentru determinarea rezistenei echivalente a circuitului este necesar de alesporiunea comun de circuit care se repet pn la infinit. Este evident, c dac vom exclude aceasta dincircuit, atunci rezistena echivalent a circuitului nu se va modifica, deoarece numrul acestor elemente(secii) este infinit. Practic, orice problem de acest tip se reduce la alegerea poriunii de circuit care serepet, iar rezistena poriunii rmase o nlocuim cu Rx, i obinem schema echivalent. Tot cu Rx senoteaz rezistena total a circuitului i problema se reduce la rezolvarea unei ecuaii ptratice.Importana acestui studiu rezult din faptul c la tema respectiv este puin informaie n literatura despecialitate. Pe de alt parte aceast tem este destul de actual, deoarece rblemele cu circuite infinitesunt prezente la diferite concursuri i olimpiade naionale i internaionale de fizic. Mat erialul prezentat


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va fi de real folos elevilor, studenilor, cadrelor didactice, precum i tuturor celora care doresc s-iaprofundeze cunotinele din domeniu.

1. ., , , 1972, Nr. 2, c. 54-59; 2. . ,

, , 1988, 8, c. 30-34;

Practicum de laborator la tema "Legea lui Arhimede i condiiile de plutire a corpurilor"

Mihail POPA1

1Department of Physical Sciences and Engineering, Alecu Russo State University, Balti, R.Moldova

Una dintre principalele probleme ale pedagogiei i didacticii este ridicarea interesului elevilor fa denvtur. Un rol important l are coninutul materiei instructive, caracterul i coninutul exerciiilor i

problemelor alese, metodele de organizare a lucrului la lecii. Dorina elevului de a afla ceva nou semenine pe parcursul ntregii perioade de instruire n coal. Acest interes trebuie s fie susinut idezvoltat att n cadrul orelor de curs, ct i a orelor extracolare. Este cunoscut faptul c fizica, la fel cai alte tiine ale naturii, a devenit tiin, desprinzndu-se de filosofie, atunci cnd Galileo Galilei a pusexperimentul la baza studierii fenomenelor din natur. De aceia, considerm c experimentul trebuie sfie o component obligatorie la majoritatea tipurilor de lecii. Cu regret, realitatea din R. Moldova esteuna alta. Lipsa utilajului adecvat sau prezena unui utilaj nvechit n licee i gimnazii impune cadreledidactice s elaboreze lucrri de laborator noi, unele dispozitive ale crora trebuie confecionate cu

minele proprii. Investigaia mea, expus n aceast lucrare, const n prezentarea a apte lucrri delaborator noi, alternative lucrrilor de laborator prezentate n manualele colare: Lucrarea de laboratorNr. 1. Deteminarea densitii unui lichid necunoscut din studiul forei Arhimede; Lucrarea de laboratorNr. 2. Deteminarea masei unui corp plutitor ntr-un lichid; Lucrarea de laborator Nr. 3. Deteminareaforei Arhimede la scufundarea unui corp solid n lichid; Lucrarea de laborator Nr. 4. Clarificareacondiiilor de plutire a unui corp n ap; Lucrarea de laborator Nr. 5. Determinarea densitii unui metalascuns intr-o bucta de plastilina; Lucrarea de laborator Nr. 6. Determinarea densitii unei pietre (corpde form neregulat). Lucrarea de laborator Nr. 7. Deteminarea densitii unui lichid necunoscutfolosind manometrul cu lichid.

, .., , , , 1988 - 175 .


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Realizarea unui sistem simplu i ieftin pentru determinri de absorbie a radiaiilor optice

tefan Adrian Rmbu4, Constantin Cercel4, Ctlin Agheorghiesei4, Ionu Topal4

4Fizic, Universitatea Alexandru Ioan Cuza, Iai, Romnia

Dou LED-uri identice montate n configuraie emitor-detector pe un dispozitiv cu rol de plac deachiziie pot furniza informaiile necesare legate de gradul de degradare a unei substane prin deteciaoptic a absorbanei. Contribuia major a constat n utilizarea unor componente electronice ieftine ceapermis reducerea costurilor unui astfel de dispozitiv fr a afecta semnificativ performaele fa de undispozitiv comercial. Astfel: n prima faz s-a folosit ca nlocuitor al plcii de achiziie o plac de tipulArduinoAtMega 2560 i n a doua etap s-a construit un programator pentru chip-urile Atmel328. S-aurealizat i o serie de teste i msurtori electrice i optice pentru a verifica fiabilitatea componentelor imrirea sensibilitii metodei nct s se poat realiza prototipul final.

Mathematical modeling of electronic transitions of drug compounds able to influence centralneural system practical applicative lesson for master students

Lucia Larisa Popescu 1, Bogdan Peptine1, Gabriel Oanca1, Dorina Creanga1

1Physics, University "Alexandru Ioan Cuza", Iasi, Romania

The lesson goal is the investigation of molecular energetic and structural parameters involved inelectronic spectra generation. The study is going to be applied to some molecular compounds withinfluence on human central nervous system. Spectral behavior in aqueous solution is also of practicalinterest and could be theoretically evidenced by computational method and checked by experimentalwork. The students need to have basic knowledge on neural system functioning as could be provided bygeneral biophysics courses and especially by neurobiophysics classes. Also quantum physics elementsare required to understand the specialized software design and use while general optics and spectroscopyare welcomed.The analyzed molecules chosen for this study have opposite actions on the neural impulsetransmission: valium with anxiolytic effect and caffeine with stimulatory influence. With specificcommands from the software menu the electronic absorption spectra of study molecules in isolated state

can be displayed- their spectral range and intensity being adjustable according to the need of comparingthem with spectrally recorded ones. Diluted solutions in water of both analyzed molecules and UV-Visspectral device are going to be used. The differences between simulated and recorded spectra could bediscussed. The role of water could be also simulated by using of PERIODIC BOX application thatenable the students to visualize hydrogen bonds between solute molecule and surrounding watermolecules. Further the electronic absorption spectra of hydrated molecules could be generated aspreviously done with isolated molecules. New comparison with experimentally recorded spectral is


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needed to understand local, specific solute-solvent interaction.The pharmaceutical administration of thestudded dugs usually involves the dilution in water or aqueous diluted solution while into the humanbody the drug molecule circulation occurs also through aqueous biological liquids. The above proposedlaboratory lesson could help in understanding the intimate mechanisms ensuring pharmaceutical

molecules circulation and local interaction with consequences on the neuronal synapses.

The role of pore connectivity on ferroelectric properties

Cipriana Padurariu1, Leontin Padurariu1, Lavinia Curecheriu1, Carmen Galassi2, Liliana Mitoseriu1

1Dielectrics, ferroelectrics & Multiferroics Group, Dept. of Physics, Al. I. Cuza University, Iasi,

Romania2CNR-ISTEC, Via Granarolo no. 64, Faenza, Italy

Pb0.988(Zr0.52Ti0.48)0.976Nb0.024O3 ceramics (denoted as PZTN) are interesting for theirpiezoelectric properties, which are the best known in the PZT family so far. Graded porosity is highlynecessary in order to adapt the acoustic impedance from ceramic solid to water [1]. Therefore,understanding the role of porosity to the functional properties is essential. Even for the same porosity,the properties can be completely different according to the microstructural characteristics (phaseinterconnectivity). The aim of the present work is to investigate the role of the pore interconnectivity on

the properties of porous PZTN ceramics (45 vol.% porosity).Ceramics with the same porosity and different pore interconnectivity induced by: (i) the addition of poreformer or by (ii) starch consolidation were investigated by comparison with dense material. The XRDpatterns show pure phase for all the ceramics. Following the different sintering processes according tothe use of pore formers, the connectivity as resulted from SEM are: 0-3 interconnectivity for starchconsolidation method and a 3-3 interconnectivity in the other case. The dielectric properties determinedat room temperature by Impedance Spectroscopy method show a reducing permittivity when increasingfrequency with a normal relaxation dispersion. A higher permittivity for (0-3) connectivity bycomparison with (3-3) is found for all the investigated frequencies. High field tunability at roomtemperature shows typical non-linear behavior with larger hysteresis and slightly higher tunability for

(0-3) connectivity. Moreover, the sample with 0-3 connectivity has almost the same tunability as thedense material, while for the other porous sample a decrease of the tunability was observed. Thetunability was discussed by considering the role of phase connectivity in the frame using effectivemedium approximations (Bruggman and Maxwell-Garnett approaches) [2, 3].

The present results show that the electrical properties of porous PZTN ceramics are strongly dependenton the phase interconnectivity. High tunability with lower permittivity than the dense ceramic can bereached in samples with (0-3) connectivity.


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[1]. E. Mercadelli et al., J. Eur. Ceram. Soc., 30, 1461 (2010)[2]. L. Padurariu et al., Appl. Phys. Lett. 100, 252905 (2012)[3]. C.S. Olariu et al., J. Appl. Phys. 114, 214101 (2013)

Determinarea selectivitii ionice a unui nanopor hibrid format dintr-un por proteic de -hemolizin i o molecul de ciclodextrin

Isabela Dragomir1, Aurelia Apetrei1

1Departament of Physics, Laboratory of Biophysics and Medical Physics, Al. I. Cuza University ofIasi, Iasi, Romania

Studiul la nivel de singur-molecul al interaciunii dintre nanopori biologici sau artificiali i diversemolecule de interes, prin tehnici de electrofiziologie molecular, reprezint o tehnic de investigaie deultim generaie din domeniul biofizicii. n acest studiu am utilizat ca nanopor proteic -hemolizina, -HL, o protein monomeric de 33.2 kDa solubil n ap, secretat de bacteria Staphylococcus aureus,care formeaz n membrane lipidice canale ionice heptamerice. Datorit proprietilor sale structurale ifizico-chimice, porul proteic de -HL a fost intens utilizat n ultimii ani ca nanosenzor molecular. nfuncie de proprietile moleculei studiate, acesta poate fi modificat controlat prin tehnici de ingineriegenetic, sau, ca n cazul studiului nostru, prin utilizarea unor adaptori moleculari care, mpreun cunanoporul, formeaz un complex hibrid cu proprieti distincte.

n experimentele noastre am utilizat un adaptor molecular de ciclodextrin, CD. CD sunt oligozaharideciclice formate din mai multe uniti de D-glicopiranoz aranjate sub forma unui trunchi de con. Aceastmolecul ciclic este stabilizat prin interaciuni necovalente n lumenul -HL, micornd astfelconductana porului i modificnd proprietile acestuia. Astfel, complexul poate fi utilizat pentrudetecia i analiza unei varieti mari de molecule mici, nedetectabile n absena adaptorului molecular.

n aceast lucrare am studiat proprietile complexului -HL-CD inserat ntr-o membran lipidicartificial reconstituit n laborator cu ajutorul tehnicii Montal&Mueller, urmrind modificareaselectivitii ionice a nanoporului hibrid. Utiliznd tehnici de electrofiziologie, am determinat curentul

ionic printr-un singur por hibrid la diferite valori ale diferen ei de potenial aplicate i am determinatvaloarea potenialului de echilibru, Veq, pentru care valoarea total de sarcin electric transportat prinpor va fi nul, iar curentul corespunztor va fi 0. Utiliznd o relaie derivat din ecuaia Goldman-Hodgkin-Katz, am determinat selectivitatea ionic ce caracterizeaz fenomenele de transport prinnanopori transmembranari i am artat c nanoporul hibrid -HL-CD este mai selectiv pentru anioni.


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Determinarea caracteristicilor unor peptide antimicrobiene cu ajutorul unor sisteme lipido-proteice

Andreea Filip1, Loredana Mereu1

1Departamentul de Fizic, Laboratorul de Biofizic i Fizic Medical , Universitatea Al. I. Cuza, Iai,

Romnia

Peptidele antimicrobiene sunt macromolecule biologice sintetizate de majoritatea organismelor vii i auun rol esenial n mecanismele de aprare a celulelor eucariote mpotriva infeciilor provocate de diferiiageni patogeni aprui n natur(1). Modul de aciune al acestor peptide antimicrobiene este n principalde distrugere a membranelor celulare microbiene i un factor decisiv n acest mecanism l reprezintstructura primar a peptidelor.

Scopul acestui studiu a fost de a realiza un sistem biologic alctuit dintr-o membran lipidic artificialai un nanopor proteic pentru a determina caracteristicile conformaionale a dou peptide antimicrobienecu structuri primare diferite. Astfel, utiliznd metoda Montal-Mueller de formare a unui bistrat lipidicartificial i un nanopor proteic de alpha-hemolizin inserat n membrana lipidic obinut(2), am calculatvolumele celor dou tipuri de peptide antimicrobiene. n plus, am pus n eviden sensibilitatea dedetecie a sistemului lipido-proteic realizat cu care am reuit s difereniem dou peptide antimicrobienecare difer n structura lor primar doar printr-un singur aminoacid.

1. K.V.Reddy,RD.Yedery,C.Arahna-Antimicrobial peptides:premises and promises,IntJ.Antimicrob Agents(2004) 536547;2. David Rodriguez-Larrea and Hagan Bayley*Multistep protein unfolding during nanoporetranslocation;

Simularea 3D a procesului de depunere a straturilor subiri cu masc coloidal

Raisa Ioana Biega1, Claudiu Costin1, Lucel Sirghi1

1Iasi Plasma Andvanced Research Center (IPARC), Facultatea de Fizic, Universitatea Alexandru Ioan

Cuza , Iasi, Romania

Procesul de depunere de straturi subiri prezint un interes sporit datorit numeroaselor sale aplicaii, dela depuneri pentru aplicaii industriale pn la bijuterii. Modelul particular studiat n lucrarea de fadescrie depunerea de nanostructuri cu ajutorul unei mti coloidale (tehnica de depunere utilizat fiind


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pulverizarea magnetron pulsat).

Simularea procesului de depunere este realizat cu ajutorul unui cod numeric 3D de tip Monte Carlo ncare un fascicul de particule pulverizate din inta magnetron ajunge pe substratul acoperit de mascacoloidal n vederea depunerii. Masca coloidal este format dintr-un monostrat compact alctuit dinsfere de polistiren. Simularea a fost realizat n 3 pai : 1) s-a luat n considerare o depunere anisotropn care toate particulele pulverizate ajung perpendicular pe suprafaa substratului, sursa de particuleavnd o distribuie omogen pe suprafaa de emisie; 2) s-a simulat un fascicul de particule incident subun anumit unghi fa de normala la suprafaa substratului; 3) s-au lansat particulele pulverizate dinpoziii i cu viteze generate aleator.

S-au urmrit traiectoriile particulelor pulverizate pn la depunerea acestora pe substrat sau ntoarcerealor n mediul din care provin, ca urmare a ciocnirilor elastice cu sferele mtii coloidale. n final, s-aanalizat influena asupra profilului de depunere 2D a densitii de flux de particule pulverizate, a durateide depunere i a distribuiei dup viteze a particulelor pulverizate.

1. Xiaozhou Ye, Limin Qi, Nano Today (2011) 6, 608631

2. Xu Dong Wang, Elton Graugnard, Jeffrey S. King,Zhong Lin Wang, and Christopher J. Summers,NANO LETTERS 2004 Vol. 4, No. 11, 2223-2226

Plasma Physics Students Club

Bogdan Butoi1,2, Lucian Tudor1,2, Paul Dinca1,2, Bogdan Bita1,2, Damir Mladenovic1,2, CezarMorarescu1,2

1Faculty of Physics, University of Bucharest, Magurele, Romania

2Plasma Physics Students Club, Faculty of Physics, University of Bucharest, Magurele, Romania

3Low Temperature Plasma, National Institute for Lasers, Plasma and Radiation Physics, Magurele,

Romania4Nano-Scale Structuring and Characterization, National Institute for Research and Development in

Microtechnologies, Bucharest, Romania5Laboratory of Optical Process in Nanostructured Materials, National Institute of Material Physics,

Magurele, Romania

For students, a first step towards a successful career is to chose a field which they like and that offers thepossibility of finding a job. This is an important role that groups in faculties have, to bring support to thestudents and to guide them. Plasma Physics Students club, established by professor Vania Covlea, has


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the role of guiding students of any kind (bachelor, master and PhD students) in a very interestingdirection that is plasma physics. 99.9% of the Universe is plasma and the goal of our club is to makestudents aware of this and to stimulate them into trying to understand such a great and vast domain. Wepresent the work our group has done with the students in the past such as research themes, bachelor

thesis, dissertations, conferences, published features and what we plan to do with future students. Evenafter graduation, the group benefits from the skills of others, thus combining the expertise in severalareas in solving the problems faced in the experiments or data processing.

Assessment of the biological impact of some soft magnetic materials on mammalian cell line

Emil PUSCASU1, Cosmin MIHAI2,4, Liviu SACARESCU3, Maria ANDRIES1, Claudia NADEJDE1,2,Dorina CREANGA1, Gabriela VOCHITA4

1Physics Department, Alexandru Ioan Cuza University, Iasi, Romania

2Interdisciplinary Research Department Field Science, Alexandru Ioan Cuza University, Iasi,

Romania3, Institute of Macromolecular Chemistry P. Poni, Iasi, Romania

4, Institute of Biological Research, Iasi, Romania

The toxicity of magnetic nanoparticles (MNP) obtained via chemical co-precipitation and modified with

sodium oleate was investigated by assessing DNA damage and cell viability from low concentrations(25 g/mL) to high concentrations (200 g/mL). Microstructural investigation and magneticmeasurements were carried out by the usual methods. X-ray diffraction (XRD) revealed goodcrystallinity with characteristic spinel structure, transmission electron microscopy (TEM) showedregular geometric shape of nanometric size (maximal particle diameter under 100 nm), mainly quasi-spherical particles, while vibrating sample magnetometry (VSM) revealed superparamagnetic behavior.The results of biological tests suggest that MNP could induce apoptosis and necrosis in Chinese hamsterlung fibroblast cells.


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Negative Curvature Universe with a Perfect Fluid Matter Source

Adrian Bodnarescu1, Ciprian Dariescu1

1Department of Theoretical Physics, Alexandru Ioan Cuza University, Iasi, Romania

The starting point in Cosmology is based on the cosmological principle, which states that there is nospecial place in the Universe, more formally, that the Universe is homogeneousand isotropic. Isotropymeans that the Universe looks the same in all directions and it is proved by the universal temperature ofthe cosmic microwave background (CMB), while homogeneity means that the Universe is the same atevery point in space and it can be shown by proving isotropy at every point. Another crucial observation

about the Universe was the redshift effect of the galaxies, which means that the frequency of the lightspectrum emitted by them is decreasing. This idea led to Hubble law and hence to the discovery of theaccelerated expansionof the Universe. Given the cosmological principle and the accelerated expansion,the line element that describes the Universe is the Friedmann-Robertson-Walker (FRW) metric,containing a time dependent scale factor and a curvature parameter. The curvature can be taken to bezero, for a flat space, positive, for a spherical Universe or negative, representing a hyperbolic Universe.The current cosmological observations tend to suggest a nearly flat Universe, i.e. vanishing curvature,but there are some issues that this model cannot accommodate, like: CMB anisotropies, baryonasymmetry, dark energy.

Hence, in this presentation, we focus on the negative curvature FRW metric, sustained by aperfect fluidmatter-source. Using the Cartan formalism, we derive the Riemann curvature tensor and write down theEinstein tensor. Considering a general equation of state, we identify and analyze different types ofmatter, like: non-relativistic dust, relativistic matter, cosmological constant. For all these cases, wesolve the Einstein equations, and find the scale factor, the Hubble parameter and the accelerationparameter. These results allow us to describe the behavior of each Universe model, more explicitly if theUniverse has an accelerated or decelerated expansion or contraction, if it has Big Bang or Big Crunchsingularities.

Acknowledgment: This work was supported by the strategic grant POSDRU/159/1.5/S/137750.

1. S. Gottlober et al., Early Evolution of the Universe and Formation of Structure (Akademie- VerlagBerlin, 1990). 2. T. Ha, Y. Huang et al., Gen. Rel. Grav. 44, 14331458 (2012).


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Mapping the Earth's magnetic field of populated zones

Adriana Neculcea1, Marian Cozma1, Andrei-Adrian Domocos1, Alexandru Stancu1

1Departament of Physics, Alexandru Ioan Cuza University, Bv. Carol I no. 11, 700506 , Iasi, Romania

The importance of the Earth's magnetic field variations is well known all over the World. Itsapplications are highly important, from the magnetic shield that protects Earth from Solar Storms, to oneof the oldest human orientation devices as magnetic compass, or even to birds orientation in flight[2].Earth Magnetic field is induced by the Earth Core and varies at the surface from 25 to 65 microTesla[1]. These small values lead to many areas of magnetic disturbances produced by iron deposits, iron

artifacts or even electrical communications. These facts are highly visible in nowadays urban zones andto show that measurements were done in different zones of Iasi city less and higher industrialized. Usinga Hirst Magnetic Gaussmeter GM05 with Hall Effect Probe with 1 microTesla sensitivity, magneticmaps on zone of interest were done.

[1] Merrill, Ronald T. (2010). Our Magnetic Earth: The Science of Geomagnetism. Chicago: TheUniversity of Chicago Press. pp. 126141 [2]Wiltschko, W,Wiltschko, R.Magnetic orientation in birds.J. OF EXP. BIOLOGY, V:199 Pg:29-38

3D printing applications

Adrian Oanea1


In the last few years new technological applications have raised due to the evolution of 3D printing.In

this paper we take into consideration the more newer functional and structural solutions in additivemanufacturing.

http://www.geeky-gadgets.com/f-electric-conductive-3d-printing-filament-launches-on-kickstarter-10-11-2014/


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Analizele spectrale i autentificarea n art

A. Hrib1, F. Iacomi1, O. Marincas2


2Facultatea de Arte Vizualei Design, Universitatea George Enescu, Iasi, Romania

Folosirea metodelor optice i spectrometrice de identificare a materialelor constituente ntr-o oper deart este o practic generalizat n conservare i restaurare. ns, n autentificarea acestora, lucrrileexistente au caracter descriptiv. Necesitatea existentei mai multor obiecte apartinnd aceleiai perioade,avnd tehnica i materialele de executie asemntoare, daca nu identice, face imposibil cuantificarea i

elaborarea unor formule general acceptate. Materialul prezint situatii ntlnite n astfel de expertize iprezint posibile solutiide dezvoltare a metodelor de autentificare n art.

Studiul curentilor electrici prin tesuturi biologice expuse actiunii jetului de plasma la presiuneatmosferica

Alice Grigoriu1

1Facultatea de Fizica, Iasi Plasma Advanced Research Center (IPARC), Universitatea Alexandru Ioan

Cuza, Iasi, Romania

Sursele de plasma rece la presiune atmosferica sunt folosite recent in aplicatii inovatoare in domeniulbiologiei, medicinei si a sigurantei produselor alimentare. Acest tip de plasme pot fi uitilizate in procesede biodecontaminare si sterilizare a suprafetelor naturale si artificiale(e.g. piele,instrumente medicale), aapei, alimentelor, sau a celulelor vii, precum si in proceduri biomedicale cum ar fi tratamentul ranilor,albirea dintilor, etc. Avand in vedere gama larga de utilizare a dispozitivelor cu plasma in aplicatii

biomedicale, se nregistreaz o nevoie clara de a studia in detaliu procesele fizico-chimice de la interfataplasma-tesuturi, cu aprecierea limitelor de utilizare in sigurana a acestor dispozitive si evaluareariscurilor posibile. Studiul de fata prezinta rezultate experimentale asupra nivelului si dinamiciicurentilor electrici care parcurg un tesut datorita contactului cu un jet de plasma la presiune atmosferica.Descarcarea utilizata pentru producerea plasmei este una cu bariera dielectrica cu geometriecilindrica,gazul de lucru folosit fiind heliul, introdus continuu in tubul dielectric cu ajutorul unuidebitmetru electronic. Formele pulsului de tensiune aplicata pe electrodul de putere(frecventa 2 kHz) si


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a curentilor pe ramura electrodului de masa si ramura tesutului expus jetului de plasma suntmonitorizate si inregistrate cu ajutorul unor sonde de tensiune si curent, conectate la un osciloscopdigital.Formele si amplitudinea curentilor pentru descarcarea primara si pentru cea secundara suntdiscutate in funcie de o serie de parametri ai procesului (amplitudinea pulsului de inalta tensiune: 6-8-

10kV; distanta de la tubul dielectric la tesut: 1,5-11mm; natura tesutului: muscular, epitelial, adipos).Astfel, se obtin valori la varf ale curentului preluat de tesut pana la cateva zeci de miliamperi, pentrudistante mici sursa de plasma-tesut.A fost masurata si intarzierea aparitiei curentului prin proba fata deaparitia curentului de descarcare, in cazul pulsului primar si a pulsului secundar. S-a determinat vitezade propagare aparenta a plasmei, rezultatele fiind in intervalul 6-10km/s, in concordanta cu rezultateleobtinute prin tehnici optice, in special fotografierea ultrapida

Microstructuri unidimensionale biomimetice de oxid de nichel. Sintez i caracterizare

Vlad-Alexandru Lukacs1, Mirela Airimioaei 1, Liliana Mitoeriu1

1Laboratorul de Dielectrici, Feroelectrici & Multiferoici, Facultatea de Fizic, Universitatea

"Alexandru Ioan Cuza", Iai, Romania

Materialele ntlnite n natur au evoluat ctre sisteme ierarhice integrate cu grad nalt de sofisticare, ceprezint comportamente multifuncionale. Replicarea acestor microstructuri i micromecanismeintegrate prezint un potenial considerabil pentru inginerie n vederea mbuntirii performanelormaterialelor. Procesul de modificare in situcu ajutorul unui bio-suport atrage o atenie considerabil attdatorit ordonrii ierarhice structurale i compoziionale, ct i datorit performanelor unice, diferite decele ale materialelor obinuite.

Oxidul de nichel este un material antiferomagnetic i semiconductor important, cu utilizare pe scarlarg n aplicaii electrochimice, optice i magnetice. Funcionalitatea deosebit depinde n mare masurde structurarea la nano- i microscar, existnd astfel interesul de a sintetiza oxid de nichelnanostructurat cu diverse morfologii [1]. Oxidul de nichel biomimetic [2] este de ateptat s prezinte

comportament magnetic complex i activiti fotocatalitice i antimicrobiene ridicate, datoritaranjamentului nano/microstructural.

Scopul acestui studiu este prepararea de microstructuri biomimetice 1-D de NiO, utiliznd drept bio-suport diverse fibre naturale i studierea efectelor parametrilor de sintez (temperatur, concentraieprecursor) asupra microstructurrii i proprietilor funcionale.

Au fost preparate cu succes microtuburi biomimetice cu faz pur de oxid de nichel, cu structur


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mezoporoas, utiliznd drept bio-suport 1-D: bumbac (Gossypium), cnep (Cannabis sativa) i in(Linum usitatissimum). Produsul final a fost obinut prin infiltrarea bio-suportului cu soluie de azotat denichel(II) cu diverse concentraii, urmat de calcinarea n aer la 600 grade C, timp de 2 ore.

Morfologia, puritatea i formarea fazei au fost investigate utiliznd microscopie electronic de baleiaj(SEM), spectroscopie fotoelectronic de raze X (XPS) i difractometrie de raze X (XRD). Influenaparametrilor de sintez i a suportului asupra caracteristicilor funcionale ale eantioanelor 1-D de NiO afost determinat i interpretat n raport cu proprietile nano/microstructurale.

[1] Z. Liu, T. Fan i D. Zhangw, J. Am. Ceram. Soc. 89[2] 662665 (2006);[2] L.J. Xie, W. Chu, Y.Y. Huang i D.G. Tong, Materials Letters 65 153156 (2011).

Monte Carlo Commissioning of a Linear Accelerator for Intraoperative Radiation Therapy

Ion Creanga1, Dan Mihailescu1

1Physics, "Alexandru Ioan Cuza" University, Iasi, Romania

Intraoperative Radiation Therapy (IORT) is a treatment modality of cancer which involves the directdelivery of a high-level radiation dose (~ 20 Gy) to the residual tumor or to the tumor bed while thetarget area is exposed during surgery, after the removal of a neoplastic mass [1]. IORT is currently

performed using 9 12 MeV electron beams produced by conventional electron accelerators adapted forIORT or by mobile dedicated accelerators directly co-located in the operating room [2]. The IORTaccelerators are equipped with long cylindrical applicators. Due to their length, the IORT applicatorshave a major contribution to the energy degradation, as well as to the spatial and angular distributions ofthe electrons at the phantom/patient surface. Most of these physical characteristics of the IORT electronbeams are difficult or even impossible to be measured with a reasonable accuracy. The alternativeconsists in the use of the Monte Carlo method to determine, accurate enough, all the physicalcharacteristics necessary for the commissioning of a linear accelerator for radiation therapy. Thistechnique, usually called Monte Carlo commissioning, is described in our work for a linear acceleratorfor Intraoperative Radiation Therapy [3]. [1] D. Mihailescu and C. Borcia, "Monte Carlo simulation ofthe electron beams produced by a linear accelerator for Intraoperative Radiation Therapy", Rom. Rep.Phys. 66 (1), 6174 (2014). [2] M. Pimpinella, D. Mihailescu, A. S. Guerra and R. F. Laitano,"Dosimetric characteristics of electron beams produced by a mobile accelerator for IORT", Phys. Med.Biol. 52, 61976214 (2007). [3] M. Oprea, C. Constantin, D. Mihailescu, C. Borcia, "A Monte Carloinvestigation of the influence of initial electron beam characteristics on the absorbed dose distributionsobtained with a 9MeV IORT accelerator", U.P.B. Sci. Bull., Series A, 74 (4), 153166 (2012).


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Gravura filmelor de biomolecule prin expunere la actiunea plasmei la presiune joasa

Cristina Gerber1, George Bogdan Rusu1, Ionut Topala1

1Facultatea de Fizic, Iasi Plasma Advanced Research Center (IPARC), Universitatea Alexandru IoanCuza , Iasi, Romania

Sursele de plasma sunt utilizate tot mai mult in diverse proceduri biomedicale cum ar fi: sterilizare sidecontaminare, modificarea metabolismului celular, a structurii si proprietatilor componentilor celulari.Preponderent, se folosesc sursele de plasma la presiune atmosferica pentru expunerea organismelor vii,datorita incompatibilitatii dintre tesuturile vii si presiuni joase. In schimb, sisteme biologice de tipulbiofilmelor pot fi expuse actiunii plasmei la presiune joasa, scopul final fiind decontaminareasuprafetelor medicale. Acest studiu prezinta rezultate obtinute in urma expunerii unor straturi de

biomolecule la actiunea plasmei de radio frecventa (13.56 MHz), cuplaj capacitiv, in aer la presiunejoasa. Filme de proteine (albumina serica bovina, BSASigma Aldrich) au fost depuse pe un substrat dequartz, prin depuneri succesive de picaturi de 1L de solutie BSA (1mg/ml in H2O) si evaporare la40oC. Suplimentar, filme de acizi grasi saturati (tesut adipos de origine animala) au fost obtinute pequartz prin aplicare manuala. In timpul expunerii pentru perioade controlate de timp, procesul principalla interfata plasma film biomolecular este cel de gravura fizica si chimica: interactiunea dintre speciilereactive si particulele incarcate din volumul plasmei si atomii filmului, rezultatul fiind particuleincarcate (ioni) si neutre (atomi, radicali) ce se desprind din tinta, modificandu-i proprietatile fizice cupierdere semnificativa de masa. Analiza efectelor expunerii a constat in monitorizarea benzilor deabsorbtie caracteristice biolomoleculelor, in domeniul UV: 210-250 nm si 250-300 nm pentru proteine

(benzi specifice tirozinei, fenilalaninei si triptofanului) si 220-260 nm in cazul lipidelor. Parametriioptimi de expunere, determinati experimental au fost: 30 de secunde la o putere pe descarcare de 10 Wsi presiune de 5*10-1 Torr, aerul rezidual. Se constata scaderea exponentiala a ariei benzii de absorbtiein timp, cu o indepartarea totala a filmului biomolecular dupa cateva minute de tratament. Sursele deplasma reprezinta, astfel, o alternativa puternica la metodele clasice de indepartare a compusilorbiomoleculari de pe suprafete medicale, implanturi sau ambalaje.


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Consideration of some pharmaceutical compound used for colds and flu

Andreea-Celia Benchea1, Dana Ortansa Dorohoi1

1Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania

Analysis of a substance before its actual synthesis plays an important role in the pharmaceuticalindustry. Physico-chemical parameters obtained theoretical have values close to the real parameters ofthe synthesized substance. The aim of this paper is to characterize some organic compounds frompharmaceutical products class for the treatment of colds and flu.

Some physical and structural properties of the molecules were obtained using the methods of molecularmodeling.

Study on the degradation behavior and stability of some polymers using thermal analysis

Laura Hrostea1, Mihai Dumitras2, Liviu Leontie1


2Faculty of Chemistry, Alexandru Ioan Cuza University, Iasi, Romania

Polymer degradation comprises a wide range of changes in the physical and chemical properties of thematerial, under the influence of one or more degradation agents such as light, chemicals, heat, bioagents,mechanical stress etc. Degradative processes are irreversible and lead to distortion and loss offunctionality of the polymeric materials. Using proper experimental techniques, the investigation ofthese processes proves useful in polymer characterization and in designing techniques for the recyclingof polymeric materials. Simultaneous thermal analysis (STA) combines different experimental methods


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of analysis under non-isothermal conditions, in order to investigate the temporal evolution of thereacting system under controlled temperature variation.

We have investigated the thermal behavior of some polymers using different thermal analysis methods,such as: differential thermal analysis (DTA), differential scanning calorimetry (DSC) andthermogravimetric analysis (TGA). In DTA, the temperature difference between the sample and areference material is recorded as a function of time, while DSC consists of a time-resolved measurementof a differential heat flow necessary to keep the sample and a reference material at the same temperatureunder non-isothermal conditions. The obvious advantage of DSC comes from the fact that thermaleffects associated with the vast majority of structural changes in polymers are measured directly. InTGA, weight loss or gain of the sample is measured as a function of time and temperature, thusproviding useful insight on the nature of the degradation process and allowing a kinetic model of theunderlying chemical transformations to be constructed and tested.

Keywords: polymer degradation, simultaneous thermal analysis, differential thermal analysis (DTA),differential scanning calorimetry (DSC), thermogravimetric analysis (TGA).

Studiul plasmei de ferita de cobalt produs prin ablaie laser

Bianca Cristiana Hodoroaba1, Stefan Andrei Irimiciuc1,2, Georgiana Bulai1, Petru-Edward Nica3,Cristian Focsa2, Silviu Gurlui1

1Atmosphere Optics, Spectroscopy and Lasers Laboratory, Faculty of Physics, Alexandru Ioan Cuza

University, Iasi, Romania2Laboratoire de Physique des Lasers, Atomes et Molcules, Universit de Lille 1 Sciences et

Technologies, Lille, France3Physics Department, Gheorghe Asachi Technical University of Iasi, Iasi , Romania

Plasma de ablaie laser este un subiect de actualitate att din punctul de vedere al cercetriifundamentale ct i prin prisma multiplelor aplicaii dezvoltate n prezent [1]. Plasma tranzitorie deablaie laser prezint o dinamic extrem de complex dependena fiind de natura intei, de

caracteristicile fasciculului laser (lungime de und, durat puls, fluen), dar i de mediul de propagare(natura gazului de lucru, presiune, etc). n aceast lucrare s-a analizat evoluia spaio-temporal aspeciilor excitate din plasm utiliznd inte variate de Fe, Co i CoFe2O4, prin folosirea diagnozei deemisie optic rezolvat spaio-temporal [2]. Plasma de ablaie este produs ntr-o incint vidat (p = 10-3Torr) folosind a doua armonic (532 nm) a laserului Nd -YAG cu o durat a pulsului de 10 ns i ofrecven de repetiie de 10 Hz. Radiaia laser a fost focalizat pe suprafaa intei cu ajutorul unei lentilecu distant focal de 40 cm asigurnd o fluen de ~5 J/cm2. De asemenea, efectul compoziiei chimice


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asupra dinamicii plasmei a fost analizat prin masurtori asupra vitezelor de expansiune i aletemperaturilor de excitare ale diferitelor specii excitate din plasm. Msurtorile preliminare evideniazo structur complex, de evoluie a plumei de plasma de ferit de cobalt i necesitatea utilizrii unormetode de diagnoz complementare (sonde Langmuir, fluorescen indus laser, spectrometrie de mas,

etc). Acest lucru este cu att mai important pentru obinerea unor straturi subtiri PLD de ferit de cobaltcu proprieti fizico-chimice speciale i pentru care nelegerea dinamicii plasmei joac un rolfundamental.

[1] L. Balika, C. Focsa, S. Gurlui, S. Pellerin, N. Pellerin, D. Pagnon and M. Dudeck, Spectrochi.ActaB, 74-75, 184 (2012);[2] S. Gurlui, M. Agop, P. Nica, M. Ziskind, C. Focsa, Phys. Rev. E, 78, 026405(2008)

GLAD technique in plasma polymerization. Influence of substrate position

Daniel Stefan1,2, Diana Neagu1,2, Andreea Gavrilescu1,2, Iulia Barbut2,3, Bogdan Butoi2,3

1Faculty of Physics, University of Bucharest, Magurele, Romania

2Plasma Physics Students Club, Faculty of Physics, University of Bucharest, Magurele, Romania

3Low Temperature Plasma , National Institute for Laser, Plasma and Radiation Physics, Magurele,

Romania

In the field of thin film deposition, GLAD technique has been proven to be an excellent method ofcreating controlled nano-structures by modifying the substrate position during the film growth. By useof this method, structures can be created, varying from nano-rods to complex spirals. A comparisonbetween GLAD technique and the DC plasma polymerization reactor will be presented. The aim of thisresearch is to combine plasma polymerization method with the advantages of GLAD technique in orderto grow thin polymer films that have different morphological proprieties. This is one of the advantagesthat plasma polymerization offers over the classical method. In the tests, aniline monomer will bedeposited on Si substrates. The thin films will be analyzed by SEM to see how the different positions ofthe substrate inside the deposition chamber can change the morphological structures of the polymer.

B. Butoi, C. Berezovski, D. Staicu, R. Berezovski, A. M. Marin, E.S. Barna, Direct Current PlasmaPolymerization Reactor for Thin Duromer Film Deposition,Journal of Optoelectronics and AdvancedMaterials,Vol 16, no9-10,201


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Studiul nanoparticulelor de ferit de cobalt obinute prin ablaie laser n lichid

Francisca Husanu1, Georgiana Bulai1, Mariana Pinteala2, Cristian Focsa3, Silviu Gurlui1

1Atmosphere Optics, Spectroscopy and Lasers Laboratory, Faculty of Physics, Alexandru Ioan Cuza

University, Iasi, Romania2Centre of Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of

Macromolecular Chemistry, Iasi, Romania3Laboratoire de Physique des Lasers, Atomes et Molcules, Universit Lille 1 Sciences et Technologies,

Lille, France

Nanoparticulele magnetice sunt studiate pe larg cu scopul de a fi utilizate n aplicaii care includ sistemeelectronice flexibile, imagistica RMN i livrare controlat de medicamente, dispozitive de stocare ainfomaiei, materiale magneto-optice transparente, senzori de cmp magnetic etc. [1]. Combinareamaterialelor polimere cu ferit de cobalt poate determina progrese tehnologice semnificative n diferitedomenii. Studiul nanoparticulelor de ferit de cobalt nglobate n polimer este susinut de proprietileinteresante ale ambelor componente (biocompatibilitate, rspuns magnetic). Folosirea materialelorpolimere ca i mediu gazd poate asigura o dispersie uniform a nanoparticulelor i proprietipromitoare (caracteristici magnetice ajustabile, transparen i rspuns magnetic, flexibilitate, rspunsmagnetoelectric). Ablaia laser este o tehnic ce poate asigura depunerea de straturi subiri cu proprietispecifice dar i sinteza de nanoparticule cristaline, fr aglomerri de particule i cu un rspuns magnetic

mai mare dect a nanoparticulelor obinute prin metode chimice [2]. Scopul studiului nostru a fost de aanaliza att influena caracteristicilor radiaiei laser (lungime de und, fluena) ct i a soluiei asupraproprietilor structurale, chimice i magnetice ale nanoparticulelor de ferit de cobalt obinute prinablaie laser. inta de ferit de cobalt a fost obinut prin tehnica ceramicii convenionale n care s -auutilizat oxizi ai elementelor componente. Pulberi de Fe2O3i Co3O4au fost mcinate, presate n discuri(250 MPa) i sinterizate n aer la 1250 C timp de 5 h, cu o vitez de inclzire de 100 C/h. inta a fostimersat n soluii de ap distilat i PEG (Mw = 6000), n diferite concentraii . Nanoparticulele au fostobinute folosind a doua armonic (532 nm) a laserului Nd-YAG cu o durat a pulsului de 10 ns i ofrecven de repetiie de 10 Hz. Radiaia laser a fost focalizat pe suprafaa intei cu ajutorul unei lentilecu distant focal de 7 cm. Rezultatele analizelor structurale i optice au evideniat influena condiiilorde ablaie asupta proprietailor nanoparticulelor studiate.

[1] T. E. Quickel, V. H. Le, T. Brezesinski, S. H. Tolbert, Nano Lett., vol. 10, no. 8, pp. 29828, Aug.2010.[2] L. Franzel, M. F. Bertino, Z. J. Huba, E. E. Carpenter, Appl. Surf. Sci., vol. 261, pp. 332336, Nov.2012.


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Observation of controlled power damping in gold nanoparticles-doped optical waveguides

Oana Daciana Botta1, Loredana Angelica Mare1, Octavian Dnil1

1Faculty of Applied Sciences, University Politehnica of Bucharest, Bucharest, Romania

For more than a century, gold has been widely used in different experiments proving its usefulnessbeyond aesthetics. Presently, gold nanoparticles have earned their place in the science field and arebeing used for SPR (Surface Plasmon Resonance) applications that consist of characterizing themolecular interactions and optical waveguides - used for mode splitting and controlled power damping attenuators, thus having been used in electronics, food industry, diagnostics and photodynamic therapy.In this paper, we investigate some of the optical properties of gold nanoparticles in certain opticaldevices, highlighting the power dampening spectrum and the output wave characterization.

Tuning the band gap energy of ZnO:N thin films obtained by HiPIMS technique

O. Vasilovici1, V. Tiron1, C. Costin1, L. Sirghi1

1Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University

of Iasi, 700506 Iasi, R

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