Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Vladimir Kovacik"'
Autor:
Vladimir Kovacik
Publikováno v:
5th International Multidisciplinary Scientific Conferences on SOCIAL SCIENCES and ARTS SGEM2018, Modern Science.
Autor:
N. Mikhin, Osamu Ishikawa, Muneyuki Fukuda, Takeshi Igarashi, Yutaka Sasaki, Takao Mizusaki, E. Hayata, Minoru Yamashita, Ryousuke Ishiguro, Minoru Kubota, Toshiaki Obata, Vladimir Kovacik
Publikováno v:
Physica B: Condensed Matter. :1577-1581
Two new high-speed rotating cryostats at the ISSP, University of Tokyo, capable of operating at mK temperatures, are currently employed for studies of superfluidity and quantized vortex states in 4 He and 3 He . A stable high-Q torsional oscillator i
Autor:
Muneyuki Fukuda, Minoru Kubota, Kenji Kimoto, Kazunari Ooyama, Tatsuya Yano, Vladimir Kovacik, Maxim Zalalutdinov
Publikováno v:
Journal of Low Temperature Physics. 113:429-434
In order to study the combined nature of 2D and 3D superfluidity and the vortex state in thin 4 He films formed in porous glasses superflow properties are studied using effective thermal conductance measurements. Detailed study, though still prelimin
Autor:
Takeshi Igarashi, Minoru Kubota, Muneyuki Fukuda, Maxim K. Zalalutdinov, Vladimir Kovacik, Toshiaki Obata, Kazunari Ooyama
Publikováno v:
Journal of Low Temperature Physics. 113:417-422
A combination of a rotating dilution refrigerator and high-Q torsional oscillator technique has been used to study dynamics of vortices in thin 4 He films adsorbed on the porous glass (d=1μm pore size). Under rotation an additional dissipation peak
Publikováno v:
Journal of Low Temperature Physics. 113:423-428
We report experiments of the torsional oscillator to observe the superfluid transition in 4 He films in porous glass (the pore diameter is 1μm). Stability and reproducibility of the oscillator, which quite often is problematic in previous experiment
Autor:
Maxim K. Zalalutdinov, K. Torizuka, Muneyuki Fukuda, Minoru Kubota, Takeshi Igarashi, Vladimir Kovacik
Publikováno v:
Journal of Low Temperature Physics. 101:567-572
The rotating dilution refrigerator has been built up and tested to study topology and dynamics of vortices in thin helium films in porous glasses. The torsional oscillator method is considered as the basic technique to be used. We are able to rotate
Autor:
Maxim K. Zalalutdinov, Toshiaki Iida, G. Ueno, Tatsuya Yano, Muneyuki Fukuda, Minoru Kubota, Vladimir Kovacik
Publikováno v:
Journal of Low Temperature Physics. 101:265-270
Thermal conductivity study of thin He films adsorbed in porous glasses with well controlled pore sizes[2] is reported. The measurements are performed in a cell where a torsional oscillator monitors the superfluid density change, for the same films fo
Autor:
Vladimir Kovacik, E. B. Sonin, Tomoki Minoguchi, Toshiaki Obata, Muneyuki Fukuda, Minoru Kubota, Maxim K. Zalalutdinov
Publikováno v:
Physical Review B. 71
A detailed study of torsional oscillator experiments under steady rotation up to 6.28 rad/sec is reported for a {sup 4}He superfluid monolayer film formed in 1-{mu}m-pore-diameter porous glass. We discovered a new dissipation peak, whose height chang
Autor:
Muneyuki Fukuda, Minoru Kubota, Takeshi Igarashi, Toshiaki Obata, Maxim K. Zalalutdinov, Vladimir Kovacik
Publikováno v:
Physica B: Condensed Matter. :117-118
Vortex dynamics of superfluid 4 He films in porous glass has been investigated with torsional oscillator technique under rotation. In addition to the 2D vortex dissipation peak, a new dissipation peak near the superfluid phase transition is found. It
Publikováno v:
Czechoslovak Journal of Physics. 46:39-40
Torsional oscillator experiments with the submonolayer superfluid4He film on the porous glass have been performed in a rotating cryostat. A new additional dissipation peak was observed under the rotation. This peak can be interpreted as a result of t