Showing papers by "Yoshishige Murakami published in 1994"
01 Jan 1994
TL;DR: In this article, temperature dependence of the complex conductivity σ = σ 1−iσ2 of YBa2Cu3O7-δ thin films has been measured by using the Mach-Zehnder type interferometric spectrometer in the millimeter wave region (140 ~ 160 GHz).
Abstract: Temperature dependence of the complex conductivity σ= σ1−iσ2 of YBa2Cu3O7-δ thin films has been measured by using the Mach-Zehnder type interferometric spectrometer in the millimeter wave region (140 ~ 160 GHz). Both σ1 and σ2 increase monotonically below Tc with decreasing temperature. The two-fluid model analysis shows that the scattering time of the quasi particle increases rapidly with decreasing temperature below Tc, which is consistent with the results reported for microwave region.
3 citations
Journal Article•
1 citations
20 Jun 1994
TL;DR: In this paper, an AC/DC power converter circuit with an energy recovery snubber for superconducting magnetic energy storage was proposed, where both di/dt and dv/dt stress on switching devices are very low compared with conventional circuits, and the energy in the snubbers capacitors can be fully recovered.
Abstract: This paper proposes to utilize an AC/DC power converter circuit with an energy recovery snubber for superconducting magnetic energy storage In this circuit, both di/dt and dv/dt stress on switching devices are very low compared with conventional circuits, and the energy in the snubber capacitors can be fully recovered Operating characteristics of the circuit are studied experimentally A multi-parallel configuration is studied in order to achieve high current handling capability and harmonics reduction >