Atsushi Kumamoto

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Observations of the subsurface geology of the Moon help advance our understanding of lunar origin and evolution. Radar sounding from the Kaguya spacecraft has revealed subsurface layers at an apparent depth of several hundred meters in nearside maria. Comparison with the surface geology in the Serenitatis basin implies that the prominent echoes are probably(More)
(1) Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan (2) Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan (3) Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan (4) Korea Institute of Geoscience & Mineral Resources (KIGAM), Korea (5) Information Media Center of(More)
The RF impedance of an antenna in a thermal magnetized plasma shows resonances associated with the electron cyclotron harmonic frequency. To understand the impedance probe observations in the thermal anisotropic plasma, characteristics of the cyclotron harmonic resonances have been examined. We verified that both the series and parallel types of the(More)
The authors discuss the semi-closed loop torque control of buried permanent magnet motor using a flux weakening approach. Following the modeling of the motor, the power capability of the machine is briefly summarized. In the flux weakening method, the controller generates current commands so that the operating point of a motor shifts from a normal mode to a(More)
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