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PProprietroprieti electricei electrice i magneticei magnetice
ale sistemelor de nanoparticuleale sistemelor de nanoparticulenn
cmp decmp denaltfrecvennaltfrecven
I. Mlescu, C. N. Marin
Universitatea de Vest din Timioara, Facultatea de Fizic, Bd. V. Prvan no. 4,300223 Timioara, Romania
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UniversitateaUniversitatea de Vest dinde Vest din TimiTimioaraoara
FacultateaFacultatea dede FizicFizic
Blvd. V. Prvan 4Timioara 300223, Timi, Romania
Tel/fax +40-(0)256-592108Email: [email protected]
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Centre deCentre de cercetarecercetare
1. Fizica materialelor cristaline (acreditat CNCSIS) Tip B
2. Centru de cercetri n Fizica Teoretic (acreditat CNCSIS)
3. Centru de cercetare pentru materialeinteligente (acreditat CNCSIS)
4. Centrul National de Difractometrie cu Raze X-Laboratorul pentruDeterminari Cristalografice
5. Grupul de electronic cuantic
6. Platforma solar
7. Grupul de relativitate numeric
Facultatea de Fizica are o baza de cercetare foarte
solid format din 3 centre de cercetare:
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Director: Prof. Dr.Prof. Dr. IoanIoan BicaBicaDirector adj.: Prof. Dr.Prof. Dr. IosifIosifMMllescuescuMembri:
Prof. dr. Agneta BalintConf. dr. Ctlin Nicolae Marin
Conf. dr. Aurel Ercuta
Conf. dr. Dorina Vangheli
Conf. dr. Costica Caizer
Lector dr. Adrian Neculae
Lector Nicoletatefu
Drd. Radu Totoreanu
Drd. Cecilia Obead
Drd. Alexandru Savici
Secretar Diana Algayer
CentrulCentruldede cercetarecercetarepentrupentru
MMaterialeaterialeIInteligententeligente
DirecDireciiii dede cecetarececetare:: Obinerea caracterizareai aplicaiile fluidelor
magnetoreologice(Prof. dr. Ioan Bica)
Procesarea materialelor n plasm(Prof. dr. Ioan Bica)
Nanosisteme de particule n cmp electromagnetici aplicaii
(Prof. dr. I. Mlescu ) Modelarea i simularea proceselor fizice n sisteme
nano-microstructurate(Lector. dr. A. Neculae) Cercetarea sistemelor de tip spinel-magnetice,
nanocristaline obinute din combinaii complexehetero-nucleare i metoda sol-gel
(Conf. dr. C. Caizer)
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Obinerea, caracterizareai aplicaiilefluidelor magnetoreologice
Procesarea materialelor n plasm(Prof. dr. Ioan Bica)
Rezultate:
30 articole de specialitate cotate ISI n ultimii 5 ani 4 contracte de cercetare internationale cu Dubna 1 Premiu al Academiei (2009)
colaborare internaionala cu Inha University din Coreea de Sud, prof. Choi,n domeniul,- realizrii de nano-microsisteme sub formde elastomerimagneto-reologici i suspensii magnetoreologice.
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Nanosisteme de particule n cmp
electromagnetic i aplicaii
Colectiv de cercetare:
Prof. Dr.Prof. Dr. IosifIosifMMllescuescuConf. dr. Ctlin Nicolae MarinConf. dr. Aurel ErcutaLector Nicoletatefu
Doctoranzi:Drd. Radu Totoreanu
Drd. Cecilia ObeadDrd. Alexandru Savici
Studeni master:Dan MlescuPetronela Burov
Cosmina Stan
ObiectiveObiective::
Studiul rezonanei feromagnetice i a proceselorde relaxare n fluide magnetice; Investigarea unor proprieti microscopice i
macroscopice ale fluidelor magnetice utilizndmsurtorile de rezonanferomagnetic;
Studiul puterii specifice in nanofluide indomeniul microundelor;
Fenomene de propagare a cmpuluielectromagnetic in domeniul microundelor;aplicaii.
Obinerea i caracterizarea de compozite
magneto-dielectrice nanostructurate cu indice derefracie negativ; Obinerea de anvelope inteligente cu absorbie
pronunatn domeniul microundelor pentruprotecia mpotriva polurii electromagnetice
Obinerea
i caracterizarea coloizilor magneto-
electrici pentru aplicaii biomedicale.
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Analizor de reea tip N9923A Agilent,2 MHz - 4 GHz
Analizor de spectru, tip HM 5510 Hameg,150 kHz - 1 GHz
RLC metru tip E4980A Agilent, 20 Hz - 2 MHz
UTILITI
Histeresisgraf, 50Hz, 0.5TGeneratoare de microundeLinii de msurcu ghid de undCelule de msurpentru msurareaparametrilor dielectrici i magnetici ndomeniul 20 Hz 4 GHz
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LISTA LUCRRILOR TIINIFICE(2006-2011)
1. Articole publicate n reviste de specialitate cotate ISI
1) P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu, P. Vlzan, S. Novaconi, S. Popescu, Effect of theconcentration of precursors on the microwave absorbent properties of Zn/Fe oxide nanopowders, J.Nanopart. Res. 13 (2011) 311319
2) P.C. Fannin, C.N. Marin, I. Malaescu, N. Stefu, P. Vlazan, S. Novaconi, P. Sfirloaga, S. Popescu, C.
Couper, Microwave absorbent properties of nanosized cobalt ferrite powders prepared bycoprecipitation and subjected to different thermal treatments, Materials and Design 32 (2011) 16001604
3) P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave propagation parameters in magneticfluids, Eur. Phys. J. E 29, 299303 (2009)
4) P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave specific loss power of magnetic fluidssubjected to a static magnetic field, Eur. Phys. J. E 27, 145148 (2008)
5) P. C.Fannin, C. N.Marin, I.Malaescu, N, Stefu,An investigation of the microscopic and macroscopicproperties of magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 87-92, (2007)
6) P. C.Fannin, I. Malaescu, C. N.Marin, Determination of the Landau-Lifshitz damping parameter ofcomposite magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 93-98, (2007)
7) P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu, Microwave dielectric properties of magnetitecolloidal particles in magnetic fluids, J. Phys.: Condensed Matter, 19 (2007) 036104-036111.
8) P.C.Fannin, C.Mac Oireachtaigh, I. Malaescu, C.N.Marin, Investigation of magnetic fluids exhibitingfield induced absorption peaks in the susceptibility spectra, Journal of Optoelectronics andAdvanced Materials 8 (1), pp. 46-49, (2006)
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2. Articole indexate in baze de date internationale
1) P. C.Fannin, I.Malaescu, N, Stefu, C. N.Marin, Polarizing field and particle concentration dependence of themagnetic loss power in ferrofluids, TIM-08, 28-29 November 2008, Timisoara, Romania, AIP ConferenceProceedings 1131, Melville New York (2009) 81-85, Editors M. Bunoiu, I. Malaescu
2) P. C.Fannin, N, Stefu, C. N.Marin, I.Malaescu, R. Totoreanu, Ferrofluid microwave devices with magneticallycontrolled impedances, TIM-09, 27-28 November 2009, Timisoara, Romania, AIP Conference Proceedings 1262,Melville New York (2010) 92-97, Editors M. Bunoiu, I. Malaescu
3) V. A.Serban, I.Malaescu, A. Ercuta, C. N.Marin, N, Stefu, C. Opris, C. Codrean, D. Utu, Magnetic properties of theWC-Co cermet powders, TIM-09, 27-28 November 2009, Timisoara, Romania, AIP Conference Proceedings 1262,Melville New York (2010) 113-117, Editors M. Bunoiu, I. Malaescu
3. Lucrari stiintifice comunicate
a) la conferine internaionale1) I. Malaescu , C. N. Marin, P. C. Fannin, Investigation of the dynamic properties of magnetic fluids using theferromagnetic resonance, 7th International Balkan Workshop on Applied Physics, July 5-7, 2006, Constanta, Romania(Invited lecture)2) P. C. Fannin, C. N. Marin, C. Couper, I. Malaescu, N. Stefu, A Comparative Study of the Field Dependence of the
Properties of Colloidal Suspensions of Nanoparticles and of Magnetic Microspheres, PIERS Proceedings, Xi'an,
China, March 22-26, 2010
b) la conferine naionale
1). P.C.Fannin, I. Malaescu, C.N.Marin, N. Stefu, Power dissipation in magnetic fluids in microwave range, PhysicsConference Tim-06, Timisoara, November 24th- 25th, 2006.
2). P.C.Fannin, I. Malaescu, N. Stefu, C.N.Marin, Dependence on the frequency and magnetic polarizing field of thecomplex dielectric permittivity of the magnetic fluids in microwave range, Physics Conference Tim-06, Timisoara,November 24th- 25th, 2006.
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3) P.C.Fannin, C.N.Marin, I. Malaescu, N. Stefu, The effect of the polarizing magnetic field and of thepartial immobilization of particles on the loss power in magnetic fluids, Physics Conference Tim-06,Timisoara, November 24th- 25th, 2006.
4) I. Malaescu, P.C.Fannin, C.N.Marin, N.Stefu, Magnetic and dielectric behaviour of magnetic fluids inelectromagnetic field, National Conference on Applied Physics, December 8-9 2006, Iasi, Romania(Invited lecture)
5) I.Malaescu, P.C.Fannin, C.N.Marin, N.Stefu,A study of magnetic fluid hyperthermia with application
to the cancer treatment, National Conference on Applied Physics, December 8-9 2006, Iasi, Romania
6) P.C. Fannin, I. Malaescu, C.N.Marin, N. Stefu, Specific loss in magnetic fluids in microwave range,Physics Conference Tim-07, Timisoara, November 23th- 24th, 2007.
7) P.C. Fannin, I. Malaescu, C.N.Marin, N. Stefu, Frequency and field dependence of the
electromagnetic field propagation constant in magnetic fluids in microwave range, PhysicsConference Tim-07, Timisoara, November 23th- 24th, 2007.
8) P.C. Fannin, I. Malaescu, C.N.Marin, The spectroscopic splitting factor of nanoparticles in magneticfluids, Physics Conference Tim-07, Timisoara, November 23th- 24th, 2007.
4. Cri publicate n edituri recunoscute (cu ISSN sau ISBN):
1) I. Mlescu, Ferofluide n cmp de radiofrecven, Editura Mirton, Timioara, 1998, ISBN:973-578-499-8.
2) I. Mlescu, Materiale i dispozitive electronice n cmp de naltfrecven, EdituraEurobit, Timioara, 2008, ISBN: 978-973-620-391-6
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Proiecte de cercetare pe baza de contract/grant
2008-2011
(in derulare )
Responsabil de
Proiect
(UVT)
Catalin Marin
Programul 4 Parteneriate in domeniile prioritare, tip PC 3516, Acronim AAEM, cu
tema: DEZVOLTAREA DE COMPOSITE MAGNETODIELECTRICE
NANOSTRUCTURATE PENTRU CREAREA DE ANVELOPE INTELIGENTE CU
ABSORBTIE PRONUNTATA A MICROUNDELOR
Coordonator: Institutul National de Cercetare Dezvoltare pentru Electrochimie siMaterie Condensata Timisoara, Director proiect, CP2 fiz. St. Novaconi
2008-2011
(in derulare )
Responsabil de
Proiect(UVT)
Iosif Malaescu
Programul 4 Parteneriate in domeniile prioritare, tip PC 3456, Acronim SENBITE,
cu tema: SINTEZA DE SEMICONDUCTORI NANOSTRUCTURATI PE BAZA DEBi2Te3 SI Zn4Sb3DOPATI CU APLICATII IN ENERGETICA CURATA
Coordonator: Institutul National de Cercetare Dezvoltare pentru Electrochimie si
Materie Condensata Timisoara, Director proiect, CP2 fiz. St. Novaconi
2006-2010Responsabil
stiintific
din partea UVT
Iosif Malaescu
Colaborare internationala cu prof. P.C. Fannin, de la Trinity College, Dublin, Irlanda,
in cadrul proiectului comun de cercetare cu tema:
THE INVESTIGATION, MEASUREMENT ANALYSIS AND APPLICATIONS OF
NANO-MICROPARTICLE SYSTEMS
Department of Electrical Engineering, Trinity College, Dublin 2, Ireland, Director
Prof. Dr. P. C. Fannin
2007-2010Responsabil de
Proiect
(UVT)
Iosif Malaescu
- Programul 4 Parteneriate in domeniile prioritare (PC), din programul PN2 cu
tema TEHNOLOGII INOVATIVE DE OBTINERE PRIN PULVERIZARE TERMICA
A MICROSTRATURILOR COMPOZITE DE TIP CERMET ANTICOROZIVE SI
ANTIUZARE, PC 2179
Universitatea POLITEHNICA Timisoara (UPT), Dir. Prof. Dr. Ing. Viorel-Aurel
Serban
2005-2008Responsabil de
Proiect(UVT)
Aurel Ercuta
Subontract CEEX, tip:P-CD, NANO4M nr.561/2005, cu tema:NANOCONTROL SI
MULTIFUNCTIONALITATE IN MATERIALE, MICROSTRATURI SIARHITECTURI CU MEMORIE A FORMEI director de proiect lector dr. Aurel
Ercuta, Universitatea de Vest din Timisoara
2006-2008Responsabil deProiect
(UVT)
Ioan Bica
- Grant de cercetare CERCETARE DE EXCELENTA (CEEX) 2006, cu tema:DEZVOLTAREA CUNOASTERII ASUPRA ELABORARII SI MICROPROCESARII
PRIN METALURGIA PULBERILOR A MATERIALELOR NANOSTRUCTURATE
PENTRU COMPONENTE MEMS, acronim : PRONANOMAT ,
beneficiar : MATNANTECH ; coordonator: Universitatea din Craiova, Faculaltea
de Ingineria si Managementul Sistemelor Tehnologice din Drobeta Turnu Severin ;
director proiect : prof.dr.ing. Mangra Mihail ; durata finantarii: 2006 - 2008
PerioadaFunciaProgramul/Proiectul
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Activitatea de cercetareActivitatea de cercetare
din ultimii cinci anidin ultimii cinci ani
Cercetare fundamentalRezonana feromagnetic
Procese de relaxare(dielectrici magnetic)
Cercetare aplicativParametrii de propagare n
fluide magnetice i feriteAbsorbani electromagnetici
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Principalele rezultate
1.1. RezonantaRezonanta feromagneticaferomagnetica
FenomenulFenomenul dede rezonantarezonanta feromagneticaferomagnetica inin fluidelefluidele magneticemagnetice,, utilizandutilizand masuratorilemasuratorile dedepermeabilitatepermeabilitate magneticamagneticacomplexacomplexa, a, a fostfost evidenevideniat iniiat iniialial dede catrecatre FanninFannin.. ExistentaExistenta fenomenuluifenomenului dede rezonantarezonanta feromagneticaferomagnetica esteeste indicataindicataprinprin
tranzitiatranzitia de la ode la o valoarevaloare supaunitarasupaunitara la ola o valoarevaloare subunitarasubunitara aapartiipartii realereale aapermeabilitatiipermeabilitatii magneticemagnetice complexecomplexe,, ((),), lala
frecventafrecventa dede rezonantarezonanta ffresres..
0,5 1 5 60,0
0,5
1,0
1,5MF1 - magnetite particles in kerosene
fmax=5.45 GHz
fmax=1.22 GHz fres=5.46 GHz
fres=1.81 GHz
10987654
32
1
''
f [GHz]
'''
'
109876543
21
0,5 1 5 60,0
0,2
0,8
1,0
1,21,4 MF2 - Mn0.6Fe0.4Fe2O3particles in kerosene
fmax=5.11 GHzfmax=0.91 GHz
fres=5.12 GHzfres=1.31 GHz
98765
43
2
72
34 5 6 98'
f [GHz]
'''
''1
10
1
10
Fig. 1. The plots of the complex permeability of sample MF1 (a) and MF2 (b) as a function of frequency and polarizing field
(the polarizing field strengths are approximately: (1) 0 kA/m,(2) 15.23 kA/m, (3) 24.47 kA/m, (4) 35.28 kA/m, (5) 46.18
kA/m, (6) 57.07 kA/m, (7) 68.49 kA/m,(8) 79.33 kA/m, (9) 90.66 kA/m, (10) 102.40 kA/m. [6]
[6] P. C.Fannin, I. Malaescu, C. N.Marin,Determination of the Landau-Lifshitz damping parameter ofcomposite magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 93-98, (2007)
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IntrIntr--un camp deun camp de polarizarepolarizare puternicputernic parametrulparametrul dede atenuareatenuare, din, din ecuatiaecuatia LandauLandau--LifshitzLifshitz satisfacesatisface conditiaconditia (17) [6](17) [6]
InIn EqEq (1),(1), fmaxfmax reprezintareprezinta frecventafrecventa corespunzatoarecorespunzatoare
maximuluimaximului dependenteidependentei dede frecventafrecventa aa componenteicomponentei imaginareimaginare,,
(())..
( )( )
( )17/1/1
2
max
2
max
res
res
ffff
+
=
0 20 40 60 80 100 1200.6
0.7
0.8
0.9
1.0
HA= 48.14 kA/m
MF1 - magnetite in kerosenefmax
/fres
H [kA/m]
0 20 40 60 80 100 1200.6
0.7
0.8
0.9
1.0
HA
=30.44 kA/m
MF2 - Mn0.6
Fe0.4
Fe2O
4particles
in kerosenefmax
/fres
H [kA/m]
( ) )18(13.01 =MF ( )2 0.127 (19)MF =
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CunoastereaCunoasterea parametruluiparametrului dede atenuareatenuare, din, din ecuatiaecuatia LandauLandau--LifshitzLifshitz esteeste importantaimportanta pentrupentru mediimedii dedenregistrare magneticnregistrare magnetic..
PePe bazabaza msurtorilor de rezonanmsurtorilor de rezonanferomagneticferomagnetic, se pot determina o serie, se pot determina o seriedede parametri macroscopiciparametri macroscopici i microscopicii microscopici aaii fluidelor magneticefluidelor magneticeinvestigate, ainvestigate, aa cum am artata cum am artatn lucrarean lucrarea [5][5] ii cum secum se observobservn tabelul 1.n tabelul 1.
[5] P. C.Fannin, C. N.Marin, I.Malaescu, N, Stefu,An investigation of the microscopic and macroscopic
properties of magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 87-92, (2007)
uundende S1, S2S1, S2 i S3 sunt fluide magnetice comerciale de tip Isopar M, cui S3 sunt fluide magnetice comerciale de tip Isopar M, cuparticule coloidale de magnetitparticule coloidale de magnetit(S1); de tip Ni(S1); de tip Ni0.50.5ZnZn0.50.5FeFe22OO44 (S2); si de tip(S2); si de tipMnMn
0.660.66ZnZn
0.330.33FeFe
22OO
44(S3).(S3).
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0,1 1 40,00
0,05
0,10
0,15
0,20MF1 - magnetite particles in kerosene
FIT
EXPERIMENTAL
''
f [GHz]0,1
1
2
3
4MF1 - magnetite in kerosene
F IT
E XPERIMENTAL
'
f [GHz]1 4
2.2. Comportarea dielectricComportarea dielectricn domeniul microundelorn domeniul microundelor [7][7]
Figure 2. Dependena de frecvena prii reale () i imaginare () a permitivitii dielectrice complexe a probeia) b)
[7] P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu,Microwave dielectric properties of magnetite colloidalparticles in magnetic fluids, J. Phys.: Condensed Matter, 19 (2007) 036104-036111.
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Utiliznd teoria lui Sillars pentru dielectrici heterogeni (R. W.R. W. SillarsSillars,, Journal ofJournal of
Institution of Electrical EngineersInstitution of Electrical Engineers, 80 (1937) 378, 80 (1937) 378--394394), n aproximaia bifazic,permitivitatea dielectriccomplexa fluidului magnetic calculatse potrivete cucea obinutexperimental [7].
3.3. PutereaPuterea specifispecificcn domeniul microundelorn domeniul microundelor [4][4]
[4] P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave specific loss power of magnetic fluidssubjected to a static magnetic field, Eur. Phys. J. E 27, 145148 (2008)
undeunde
La o frecven, f(Hz), puterea de disipaie,
p, depinde de cmpul magnetic extern iprezintun maxim. Rezultatul obinutsugereazposibilitatea controlriiabsorbiei de energie n microunde afluidelor magnetice prin intermediul unui
cmp magnetic extern aplicat.
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4.4. ParametriiParametrii dede propagarepropagarenn nanosistemenanosisteme dede particuleparticulenn
domeniul microundelordomeniul microundelor [1] [2][1] [2] [3][3]
ntr-un mediu omogeni izotrop,supus aciunii unui cmpelectromagnetic armonic, pornind de laecuaiile lui Maxwell rezult ecuaiaundelor:
Mrimea:
se numete constant de propagare fiindo marime complex ce se poate scrie
sub forma:
Mrimea: se numete impedana intrinsec a mediului, undeZ0=377
Mrimea
se numete coeficientul dereflexie la suprafata desepararie dintre medii.
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------------------------------------------------------------------------------------
[1] P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu, P. Vlzan, S. Novaconi, S. Popescu, Effect of the concentration of precursors onthe microwave absorbent properties of Zn/Fe oxide nanopowders, J. Nanopart. Res. 13 (2011) 311319
[2] P.C. Fannin, C.N. Marin, I. Malaescu, N. Stefu, P. Vlazan, S. Novaconi, P. Sfirloaga, S. Popescu, C. Couper, Microwave
absorbent properties of nanosized cobalt ferrite powders prepared by coprecipitation and subjected to different thermal treatments,
Materials and Design 32 (2011) 16001604
[3] P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave propagation parameters in magnetic fluids, Eur. Phys. J. E 29, 299
303 (2009)
Cunoaterea parametrilor de propagare este importantpentruobinerea de absorbani electromagnetici pentru protecie
mpotriva polurii electromagnetice.
Astfel n lucrarea [1], s-a urmrit efectul concentraiei precursorilor asupra proprietilor de absorbantelectromagnetic n domeniul microundelor pentru nanopulberi de oxid de Fe-Zn.
x=Fe3+/Zn2+; x(A)=2.8/0.2; x(B)=2.5/0.5; x(C)=1.8/1.2; x(D)=1.5/1.5.
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Rezultate in curs de diseminare
Intra-well relaxation process in magnetic fluids subjected to strong polarising fields
Studiul relaxarii magnetice si a efectului magneto-vascos in nanofluide magnetizabile
Nanosisteme de particule in camp electromagnetic
Teme propuse pentru doctoranzi
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V MULUMESC!