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Improvement of Demagnetization by Rotor Structure of IPMSM with Dy-free Rare-Earth Magnet
Imamura, Keigo,Sanada, Masayuki,Morimoto, Shigeo,Inoue, Yukinori Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
Permanent magnet (PM) motors that employ rare-earth magnets containing dysprosium (Dy) are used in electric and hybrid electric vehicles. However, it is desirable to reduce the amount of Dy used since it is expensive. This study investigates the rotor structure of a PM synchronous motor with a Dy-free rare-earth magnet. Flux barrier shapes and PM thicknesses that enhance the irreversible demagnetization are investigated. In addition, a rotor structure that improves the irreversible demagnetization is proposed. We demonstrate that the proposed rotor structure without Dy improves the irreversible demagnetization.
Imamura, Satoshi,Bapary, Mohammad Abu Jafor,Takeuchi, Yuki,Hur, Sung-Pyo,Takemura, Akihiro The Korean Society of Fisheries and Aquatic Scienc 2014 Fisheries and Aquatic Sciences Vol.17 No.2
The present study examined whether light emitted by long-afterglow phosphorescent pigments (LumiNova) would stimulate gonadal development in fish during the nonbreeding season. Pellets containing LumiNova powder (treatment group) were prepared and placed on the calvaria of specimens of the sapphire devil Chrysiptera cyanea, a reef-associated damselfish that requires long days for gonadal recrudescence. A pellet without LumiNova powder was placed on the calvaria of the control fish (control group). Fish were reared at $26^{\circ}C$ under a light-dark cycle (12 h photophase, 12 h scotophase; LD 12:12) for 4 weeks. No difference in the gonadosomatic index (GSI) or ovarian histology was observed among the control, sham-operation, and treatment groups 1 week after the start of the experiment. After 4 weeks, the GSI of the control and sham-operation groups remained at low levels, and ovaries contained immature oocytes at the perinucleolus stage. In contrast, the treatment group exhibited significantly higher values of GSI as well as developed ovaries with fully vitellogenic oocytes. These results demonstrated that long-day conditions were produced by light emitted from the LumiNova pellets, thus stimulating ovarian development in the damselfish. Therefore, long-afterglow phosphorescent pigments can be used as an alternative to standard light sources for purposes of artificial stimulation of gonadal development in fish.
Immunofluorescence Microscopic Studies in Dermatology
Imamura, Sadao 대한피부과학회 1980 大韓皮膚科學會誌 Vol.18 No.6
Amphotericin B is a fungicide which has proven to be very effective in the treatment of a number of systemic mycotic infections. The problem with treatment by the drug has been its toxicity. Infact, the studies of these side effects have become and important part of the research project. This report is an exparimental study about histopathological changes in internal organs after amphotericin B administration in rats. Amphotericin B was given 5mg/kg or 15mg/kg intraperitoneally and the rats were killed 6 hr, 24 hr and 48 hr after the administration.
Imamura, Hiroshi,Hasegawa, Yutaka,Murata, Junsuke,Chihara, Sho,Takezaki, Daisuke,Kamiya, Naotsugu Korean Society for Fluid machinery 2009 International journal of fluid machinery and syste Vol.2 No.3
Since large-scale commercial wind turbine generator systems such as MW-class wind turbines are becoming widely operated, the vibration and distortion of the blade are becoming larger and larger. Therefore the soft structure design instead of the solid-design is one of the important concepts to reduce the structural load and the cost of the wind turbine rotors. The objectives of the study are development of the fluid-structure coupled analysis code and evaluation of soft rotor-blade design to reduce the unsteady structural blade load. In this paper, fluid-structure coupled analysis for the HAWT rotor blade is performed by free wake panel method coupled with hinge-spring blade model for the flapwise blade motion. In the model, the continuous deflection of the rotor blade is represented by flapping angle of the hinge with one degree of freedom. The calculation results are evaluated by comparison with the database of the NREL unsteady aerodynamic experiment. In the analysis the unsteady flapwise moments in yawed inflow conditions are compared for the blades with different flapwise eigen frequencies.