RNDr. Pavol UŠÁK, CSs.

2013

Ušák, P. and Mozola, P.: How to speed up Y–Ba–Cu–O tape recovery. IEEE Trans. Applied Supercond. 23 (2013) 4701011.

2011

Ušák, P.: Errors in measurement of current distribution in a superconducting tape, Supercond. Sci Technol. 24 (2011) 045007.

2009

Ušák, P., Polák, M., and Mozola, P.: Measurement of the lateral transport current distribution in YBCO tape, IEEE Trans. Applied Supercond. 19 (2009) 2839-2842.

2008

Ušák, P., Polák, M., Kvitkovič, J., Mozola, P., Barnes, P.N., and Levin, G.A.: Current distribution in the winding of a superconducting coil, IEEE Trans. Applied Supercond. 18 (2008) 1597-1600.

Polák, M., Barnes, P.N., Kvitkovič, J., Levin, G.A., Mozola, P., and Ušák, P.: Properties of an experimental coil wound with YBCO coated conductor carrying an AC current with frequencies up to 864 Hz, IEEE Trans. Applied Supercond. 18 (2008) 1240-1244.

2007

Ušák, P., Polák, M., Demenčík, E., Kvitkovič, J., Levin, G.A., and Barnes, P.N.: The current distribution in a striated YBCO tape subjected to both a magnetization and a transport current, Supercond. Sci Technol. 20 (2007) 994-1001.

Ušák, P., Polák, M., and Demenčík, E.: Current distribution in thermally degraded superconductor of 2nd generation, Physica C 455 (2007) 67-70.

Demenčík, E., Ušák, P., Takács, S., Vávra, I., Polák, M., Levin, G.A., and Barnes, P.N.: Visualization of coupling current paths in striated YBCO-coated conductors at frequencies up to 400 Hz, Supercond. Sci Technol. 20 (2007) 87-91.

Demenčík, E., Ušák, P., and Polák, M.: Hall probe based system for study of AC transport current distribution in YBCO coated conductors at frequencies up to 700Hz, IEEE Trans. Applied Supercond. 17 (2007) 3175-3178.

2006

Ušák, P., Sastry, P.V.P.S.S., and Schwartz, J.: Model inverse calculation of current distributions in the cross-section of a superconducting cable, Physica C 434 (2006) 1-5.

Ušák, P.: Dependence of the recovery current of multifilamentary NbTi superconductors on matrix purity, Supercond. Sci Technol. 19 (2006) 22-26.

Ušák, P.: The change in tape current distribution during gradual current ramping up over Ic and down to zero, J. Phys.: Conf. Ser. 43 (2006) 55-58.

Polák, M., Ušák, P., and Demenčík, E.: The distribution of magnetization and transport currents in DyBCO tape, Physica C 440 (2006) 40-44.

Demenčík, E., Ušák, P., Polák, M., Piel, H., and Dhalle, M.: Lateral critical current distribution and self-field profile of Bi-2223/Ag conductors: measurements and calculations, Supercond. Sci Technol. 19 (2006) 848-853.

Mozola, P., Ušák, P., Ryzá, J., and Polák, M.: Thermal conductivity in a sample simulating the winding structure of Bi-2223/Ag epoxy impregnated coils, J. Phys.: Conf. Ser. 43 (2006) 75-78.

2005

Chovanec, F. and Ušák, P.: Temperature oscillations in thin metallic tapes with transport current at liquid nitrogen temperature, Cryogenics 45 (2005) 129-133.

2004

Sastry, P.V.P.S., Nguyen, D.N., Ušák, P., and Schwartz, J.: Verification of thermal interpretation of BSCCO-2223/Ag current-volatge hysteresis, Supercond. Sci Techn. 17(2004) 314-319.

2003

Ušák, P.: The measurements of current distribution in superconducting tape. Comparison of destructive and non-descructive methods, Physica C 384 (2003) 93-101.

Ušák, P.: Random instabilities of current-voltage curves of BSCCO-2223/Ag multifilamentary tapes in LN2 at 77K, Supercond. Sci & Technology 16 (2003) 459-463.

Jelinek, Z., Timoransky, Z., Zizek, F., Piel, H., Polak, M., Chovanec, F., Mozola, P., Janšák, L., Kvitkovič, J. and Ušák, P.: Test results of 14 kVA superconducting transformer with Bi-2223/Ag windings, IEEE Trans. on Applied Supercond. 13 (2003) 2310.

Hense, K., Kirchmayr, H., Kováč, P., Lackner, R., Müller, M., Pachla, W., Pitel, J., Polák, M., and Ušák, P.: Preparation and characterization of Bi-2223 tapes, Physica C 392-396 (2003) 1007-1010.

2002

Chovanec, F. and Ušák, P.: Instabilities above critical current region in Bi-2223/Ag superconducting coils cooled by liquid nitrogen, Cryogenics 42 (2002) 543-546.

Polák, M., Ušák, P., Janšák, L., Kvitkovič, J., Timoranský, Z., and Žižek, F.: Effect of ferromagnetic rings on critical current and AC losses of a coil made from Bi-2223/Ag tape, IEEE Trans. on Applied Supercond. 12 (2002) 1632-1634.

Chovanec, F., Jahn, P., Janšák, L., Jelinek, J., Kvitkovič, J., Mozola, P., Piel, H., Polák, M., Timoranský, Z., Ušák, P., and Žižek, F.: 15kVA superconducting transformer. In: 7th Int. Conf. Cryogenics 2002. Praha 2002. P. 46-48.

2001

Ušák, P., Janšák, L., and Polák, M.: Hysteresis of V-I curve of BSCCO-2223 tape, Physica C 350 (2001) 139-146.

Polák, M., Ušák, P., Pitel, J., Janšák, L., Timoranský, Z., Žižek, F., and Piel, H.: Comparison of solenoidal and pancake model windings for a superconducting transformer, IEEE Trans. on Applied Supercond. 11 (2001) 1478-1481.

2000

Polak, M., Jansak, L., Kvitkovic, J., Usak, P., Paasi, J., Lehtonen, J., Daumling, M., Kasztler, A., Kirchmayr, and H.: Effect of interturn spacing on ACloss of single layer Bi-2223/Ag coils, IEEE Trans. on Applied Supercond. 10 (2000) 673-676.

Ušák, P., Janšák, L., and Polák, M.: BSCCO(2223)/Ag multifilamentary tape in inclined external magnetic field. In: Cryogenics 2000. Ed.: V.Chrz. Prague, ICARIS 2000. P. 60-63.

1999

Ušák, P.: Measurement of the transport current distribution in a superconducting tape, Physica C 316 (1999) 229-233.

1998

Ušák, P., Janšák, L., and Chovanec, F.: Local nature of transport properties of Ag-sheathed BSCCO (Bi-2223) superconducting tapes. In: Proc. 5th Int. Conf. Cryogenics 98. Prague 1998. P. 108.

1997

Ušák, P., Chovanec, F.: Measurement of current density distribution in high TcAg-sheathed superconducting tapes, IEEE Trans. on Applied Supercond. 7 (1997) 1343.

1996

Ušák, P., and Chovanec, F.: The dynamics of current density distribution in Ag-sheathed TBCCO tape in changing gradient field, IEEE Trans. on Magnetics 32 (1996) 2818-2821.

Ušák, P., Janšák, L., and Chovanec, F.: Anisotropy of E(j) characteristics of Ag-sheathed BSCCO tapes with respect to external magnetic field, Applied Superconductivity 4 (1996) 577. (Printed in 1997).

Ušák, P. and Chovanec, F.: Influence of gradient magnetic field on current redistribution in Ag-sheathed TBCCO tape. In: Cryogenics 96. Proc. of the 4th Inter. Conf. Praha 1996. P. 97-100.

Chovanec, F., Ušák, P., and Kokavec, J.: Electromagnetic properties of Tl-Ba-Ca-Cu-O (Tl-2212) superconducting tapes and films. In: Cryogenics 96. Proc. of the 4th Inter. Conf. Praha, 1996. P. 24-27.

1995

Chovanec, F., Janšák, L., Kottman, P., Majoroš, M., Ušák, P., Suchoň, D., and Jergel, M.: Critical current anisotropy of Ag-sheathed 2212 TlBaCaCuO superconducting tapes, IOP 148 (1995) 475.

Ušák, P.: Computer controlled sequential measurement of the Nb/Ti superconductor recovery behaviour. In: The 3rd Japanese-Czech-Slovak Joint Seminar on Applied Electromagnetics. Praha, CTU 1995. P. 190-193.

1994

Chovanec, F., Ušák, P., Kokavec, J., and Sidorov, M.: Quench behaviour of adiabatic NbTi superconducting winding under controlled stress, Cryogenics 34 (1994) S521.

Kokavec, J., Ušák, P., Krempaský, L., and Chovanec, F.: Precise determination of superconducting magnet axis, Cryogenics 34 (1994) S681.

Ušák, P.: Indirect measurement of NbTi wire temperature field response to local heat input, Cryogenics 34 (1994) S531.

Ušák, P.: Superconductings tape cross section j fied dynamics as an inverse problem for self field mapping, J. of the Japan Society of Appl. Electromagnetics Suppl. 3 (1994) 25.

Ušák, P., Chovanec, F., and Kokavec, J.: Measurement by resistive strain gauges in strong magnetic fields at liquid helium temperature, J. of the Japan Society of Appl. Electromagnetics Suppl. 3 (1994) 265.

Ušák, P.: Indirect measurement of T(x) profile of locally heated NbTi wire. In: Kryogenika 94. Ústí n. Labem 1994. P. 143.

Ušák, P.: Simple way to measurr Ic(B,T) critical surface of NbTi superconducting wire. In: Kryogenika 94. Ústí n. Labem 1994. P. 140.

Chovanec, F. and Ušák, P.: Improvement of the superconducting magnetic system stability. In: Kryogenika 94. Ústí n. Labem 1994. P. 118.

Ušák, P. and Chovanec, F.: Application limits for low and high Tc superconductors from stand point of mechanical stability. In: Proc. of the Japan-Central Europe Joint Workshop on Advanced Computing in Engn. Ed. M. Akiyama. Varšava 1994. P. 317-323.

1993

Ušák, P., Kokavec, J., Chovanec, F., Krempaský, L., and Gregor, B.: B.: Safety and protection of 8T NbTi gyrotron magnet in persistent mode, IEEE Trans. on Magnetics 29 (1993) 2238.

1992

Chovanec, F., Ušák, P., Kokavec, J., and Krempaský, L.: Influence of construction concepts on training behaviour of gyrotron magnets, Cryogenics 32 (1992) 394.

Ušák, P., Chovanec, F., Hanečka, B., Kokavec, J., and Krempaský, L.: The designe of stable race track superconducting switch, Cryogenics 32 (1992) 466.

Ušák, P., Kokavec, J., Chovanec, F., Krempaský, L., and Gregor, B.: Experience with operational and quench behaviour of large 8T gyrotron magnet. In: Cryogenics 92. Brno, ČS VTS 1992. P. 141.

Ušák, P. and Kokavec, J.: Low temperature behaviour of commercially availlable high current silicon diodes. In: Cryogenics 92. Brno, ČS VTS 1992. P. 138.

1991

Ušák, P. and Kokavec, J.: Application of tensometers in measurements of ponderomotive deformation of superconducting magnet. In: Proc. 4th Symposium on „Sensors and sensor systems“ at Technical University Košice. Sensor Prešov 1991. P. 51.

Chovanec, F., Kokavec, J., Krempaský, L., Ušák, P., Gregor, B., and Pitel, J.: Gyrotron superconducting magnet systems for ITER program. In: Proc. 2nd Czechoslovak-Italian Symp. on Superconductivity. Bratislava, Veda 1991. P. 160.

Ušák, P., Kokavec, J., Chovanec, F., Krempaský, L., and Gregor, B.: The gyrotron magnets overheating and dynamics of heat input helium base after the quench. In: Proc. 2nd Czechoslovak-Italian Symp. on Supercond. Bratislava, Veda 1991. P. 167.

Ušák, P.: Instabilities of superconductor winding in the race track superconducting switch. In: Proc. of the Int. Symposium on AC Superconductors. Bratislava, IEE SAS 1991. P. 143.

1990

Karasik, V.R., Vysotsky, V.S., Kleshnina, O.A., Deryagin, S.G., Levin, S.M., Malgynov, V.A., Svietsky, A.P., Chovanec, F., Kokavec, J., Krempaský, L., Ušák, P., and Gregor, B.: High current density superconducting magnet for gyrotron. In: 11th Int. Conf. on Magnet Technology. Eds. T. Sekugichi, S. Shimamoto. London, Elsevier Appl. Sci 1990. P. 1286-1290.

Ušák, P., Kokavec, J., Krempaský, L., Chovanec, F., and Gregor, B.: Mechanical instabilities and training behaviour of superconducting magnets for gyrotrons. In: Kryogenika 90. Košice, DT ČSVTS 1990. P. 135.

1989

Ušák, P. a Kleshnina, O.A.: Povyšenije mechaničeskoj ustojčivosti sverchprovodaščich NbTi obmotok solenoidalnovo tipa na osnove optimizacionnovo rasčota konstrukcionnych parametrov. In: Naučno-techničeskij seminar o kriogennej technike. Plzeň 1989. P. 104-112.

1988

Chovanec, F., Kokavec, J., Krempaský, L., Ušák, P., Polák, M. a Janšák, L.: Kryomagnetické systémy pre ohrev plazmy v zariadeniach typu TOKAMAK. In: Kryogenika ’88. Ústí n. Labem, Dům techniky ČSVTS 1988. S.63.

Kollár, L., Ušák, P., Kokavec, J., Hasenöhrl, S. a Morvic, M.: Meranie parametrov Hallových sond na báze GaAs, Elektrotechn. časopis 39 (1988) 912.

Polák, M., Hlásnik, I., Chovanec, F., Kedrová, M., Kottman, P., Krempaský, L., Majoroš, M., Talapa, J., Ušák, P. a Vencel, L.: K meraniu kritickej teploty a kritického prúdu vysokoteplotných supravodičov YBaCuO, Elektrotechn. časopis 39 (1988) 231.

1987

Ušák, P.: Degradácia supravodivého vinutia z hľadiska stability, Transformátory 67 (1987).

1986

Chovanec, F., Kokavec, J., Krempaský, L., Janák, L., a Ušák, P.: Sverchprovodjaščije magnitnyje sistemy dlja SVC kompelksa nagreva plazmy v ustanovke Tokamak T-15. In: Trudy 1. meždunar. symposiuma po fiziko-techničeskim problemam ispoľzovanija sverchprovodimosti v energetike. Bratislava, EÚ CEFV SAV 1986. P. 75.

Ušák, P.: Výpočet závislosti rekuperačného prúdu mnohovláknitých NbTi supravodičov od čistoty matrice a od kritickej teploty, Elektrotechn. časopis 37 (1986) 489.

1984

Ušák, P.: Meranie teplotnej inercie odporov Allen-Bradley pomocou VA charakteristík. In: Kryogenika 84. Bratislava, EÚ CEFV SAV 1984. S.98.

1981

Ušák, P. a Jastrebská, T.: Meranie vlastného poľa supravodivej pásky z Nb3Sn, Elektrotechn. časopis 32 (1981) 676.

1980

Polák, M., Ušák, P. a Štofanik, F.: Zvýšenie linearity nízkoteplotných Hallových sond, Elektrotechn. časopis 31 (1980) 325.

1979

Ušák, P.: Referát o vlastnostiach Hallových sond vyrábaných na EÚ SAV. In: Doklady sovmestnoj roboty. Wroclaw, Inst. Niz. Temperatur i badan strukturalnych PAN 1979. P. 89.