Prof. univ. dr. Vasile A. POPESCU

E-mail : cripoco@physics.pub.ro

 

 

 

             Prezentarea activităţii didactice (cursuri prezentate):

1. V. Popescu, Fizica Vol I, Editura Universităţii Politehnica Bucureşti, 1992 (211 pagini)

2. V. Popescu, Fizica Vol II, Editura Universităţii Politehnica Bucureşti, 1993 (166 pagini)

3. V. Popescu, Fizica Vol III, Editura Universităţii Politehnica Bucureşti,1992 (140 pagini)

4. V. Popescu, Probleme rezolvate de Fizică Vol I, Universităţii Politehnica Bucureşti, 1991 (201 pagini)

 

             Prezentarea activităţii de cercetare:

Am lucrat în domeniul rezonanţei magnetice nucleare, la construirea unor laseri cu azot, la studierea unor cristale lichide, la caracterizarea şi simularea zgomotului în supraconductori şi la îmbunătăţirea unor metode de aproximare folosite în mecanica cuantică şi la studiul propagării undelor în ghiduri de undă.

 

             Domenii de activitate:

Ř       Rezonanţă magnetică nucleară

Ř       Cristale Lichide

Ř       Laseri cu azot

Ř       Aplicarea teoriei percolaţiei la studiul zgomotului în supraconductori

Ř       Metode de perturbaţie, variaţionale şi metoda elementului finit

 

             Articole reprezentative:

1. V. A. Popescu, „Improving the accuracy of normalized propagation constant for waveguides by using higher-order variational method”, Optics Communications 234, 177-181 (2004)

2. V. A. Popescu,"Combination of the variational and finite element method for the D-dimensional generalized anharmonic oscillator", Phys. Lett. A 297, 338-343 (2002)

3. V. Popescu,"Application of an improved variational method to the D-dimensional generalized anharmonic oscillator", Phys. Lett. A 299 , 197-200 (2002)

4. V. A. Popescu, A. Stepanescu, „Magnetic field and current dependence of average activation energy in YBCO-Tc granular superconductors”, Modern Physics Letters B 15, 555 (2001) and erratum[B 15, 1099 (2001)]

5. V. A. Popescu, A. Stepanescu, „Temperature dependence of critical current and resistance fluctuations in bulk polycrystalline YBCO superconductors, Modern Physics Letters B 15, 1095 (2001)

6. V. A. Popescu, “Noise dependence on switching rate of intergrain junctions in superconductors “, Phys. Lett. A 265, 426 (2000)

7. V. A. Popescu, A. Stepanescu, “Electrical resistance noise and thermal fluctuation in high-Tc granular superconductors”, Journal of Superconductivity 13, 389 (2000)

8. V. A. Popescu, “Higher-order squeezing degree in mesoscopic Josephson junction in the presence of nonclassical radiation field”, Modern Physics Letters B 14, 203 (2000)

9. V. A. Popescu, „Higher-order successive squeezed thermal state”, Modern Physics Letters B 14, 211 (2000)

10. V. A. Popescu, “Higher-order successive squeezed number and coherent state”, Modern Physics Letters B 14, 599 (2000)

11. V. A. Popescu, „Interaction of mesoscopic Josephson junction with a successive squeezed coherent field”, Modern Physics Letters B 14, 609 (2000)

12. V. A. Popescu, “Second-Order Correlation Function for Successive Squeezed States”, Mod. Phys. Lett. B 13, 1063 (1999)

13. V. A. Popescu, A. Stepanescu, E. Smeu, M. Cristea, “Field dependence of electrical resistance noise in granular high-Tc superconductors”, Phys. Lett. A 259,499 (1999)

14. V. A. Popescu, A. Stepanescu, M. Cristea, “Thermal fluctuation influence on the resistive noise in high-Tc granular superconductors”, Mod. Phys. Lett. B 13, 783(1999)

15. V. A. Popescu, A. Stepanescu, P. Mazzetti, I. Puică,” Simulation of electrical noise spectrum in bulk polycrystalline YBCO superconductors under magnetic field” Phys. Lett. A 238, 192 (1998)

16. I. Puică, V. A. Popescu, P. Mazzetti, A. Stepanescu and Gh. Ciobanu, “Current-influenced voltage noise in bulk polycristalline high- Tc superconductors”, PHYSICA C 290, 303 (1997)

17. V. A. Popescu, A. Stepanescu, C. Botez, “Percolative simulations of resistance noise peak shift in granular high Tc superconductors in a magnetic field”, Phys. Lett. A 220, 143 (1996)

18. V. A. Popescu, A. Stepanescu , M. Cristea,”Simulation of electrical resistance noise hysteresis in high -Tc  granular superconductors under a magnetic field”, PHYSICA C 273, 157 (1996)

19. V. A. Popescu, “Successive squeezed states”, OPTICAL ENGINEERING 35, 1600 (1996)

20. M. Celasco, G. Cone, A. Masoero, V. A. Popescu, A. Stepanescu, “Percolative bonds and resistance noise in HTc bulk superconductors”, Phys. Lett. A 201, 429 (1995)

21. V. A. Popescu, ”A new form of the succesive variational method for the D-dimensional generalized anharmonic oscillator”, Phys. Lett. A 193, 431 (1995)

22. M. Celasco, G. Cone, V. A. Popescu, A. Masoero , A. Stepanescu, “Resistive noise of YBCO high Tc granular superconductors in magnetic field”, PHYSICA C 252 , 375(1995)

23. V. A. Popescu, I. M. Popescu, M. Jitaru, “The successive perturbation method in the various orders of perturbation”, Can. J. of Physics 68, 1476 (1990)

24. V. A. Popescu, I. M. Popescu,”Improvement of the convergence of the exponential perturbation theory in the Schrödinger representation by dividing the time interval”, Can. J. of Physics 68, 1221 (1990)

25. V. A. Popescu, I. M. Popescu, M.C. Rusescu, “Comparison between the succesive perturbation method and the analytic continuation method”, Phys. Rev. A 39, 5425 (1989)

26. V. A. Popescu, I. M. Popescu, “Application of the perturbation theory to the effects of solute-solvent interactions on the vibrational spectrum”, Phys. Lett. A 127, 305 (1988)

27. V. A. Popescu, I. M. Popescu, M. C. Rusescu, “Application of the successive variational method to the D-dimensional generalized anharmonic oscillator”, Phys. Lett. A 132, 423, 1988

28. V. A. Popescu,. M. Popescu, “Combination of the successive perturbation method with other common methods”, Can. J. of Physics 65, 462 (1987)

29. I. Cuculescu, R. Bena, V. A. Popescu, A. Enache, I. Baciu,”Costa Ribeiro Effect in some cholesteryl esters”, Phase Transitions 3, 141 (1983)

 

             Teme de cercetare abordate în prezent:

            Aplicarea metodelor de aproximare la studiul propagării undelor în ghiduri de undă.