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Brane-localized masses in magnetic compactifications
Ishida, Makoto,Nishiwaki, Kenji,Tatsuta, Yoshiyuki American Physical Society 2017 Physical review. D Vol.95 No.9
<P>We discuss the effects of the brane-localized mass terms on the fixed points of the toroidal orbifold T-2/Z(2) under the presence of background magnetic fluxes, where multiple lowest and higher-level Kaluza-Klein (KK) modes are realized before introducing the localized masses in general. Using linear algebra, we find that, in each KK level, one or more of the degenerate KK modes are almost inevitably perturbed, when single or multiple brane-localized mass terms are introduced. When the typical scale of the compactification is far above the electroweak scale or the TeV scale, we apply this mechanism for uplifting unwanted massless or light modes which are prone to appear in models on magnetized orbifolds.</P>
Growth and Etching of Single Crystalline Al₂O₃on Si for SOI Sensors
Ishida, Makoto 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Double SOI structures using heteroepitaxial growth of Al_(2)O_(3) and Si are developed for sensor applications. A very stable epitaxial Al_(2)O_(3)(100) film grown on a Si(100) substrate can be used as a etching stop layer to fabricate a diaphragm, and as a electric-isolation layer of an SOI device. Using these characteristics, a high-temperature-operated pressure sensors was demonstrated. Important technologies for the SOI processes with the Al_(2)O_(3) film were developed: the one is a new etching method of the chemically stable A1,03 films and sapphire wafers by Si ion implantation method, and the another is the selective epitaxial growth of Si(100) on Al_(2)O_(3)(100) by electronbeam-irradiation method to make a fine pattern.
Ishida, Yoshihito,Yokomachi, Kazutoshi,Seino, Makoto,Hayakawa, Teruaki,Kakimoto, Masa-aki The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.2
Hyperbranched polysiloxysilanes (HBPSs), with a variety of terminal functional groups (vinyl, epoxy, carboxyl and hydroxyl), were synthesized by the self-polymerization of an $AB_3$ type monomer of tris(dimethylvinylsiloxy) silane, with subsequent end-functionalizations, such as epoxidation and radical addition reaction, respectively. The ratio of the $\alpha-and$ $\beta-addition$ linkages in the HBPS polymerized by hydrosilylation of the $AB_3$ monomer was found to be approximately 1 to 3. The thermal stability and solubility were affected by the terminal functional groups.
Yuhei Okazaki,Wataru Kawamura,Makoto Hagiwara,Hirofumi Akagi,Takashi Ishida,Masahiko Tsukakoshi,Ritaka Nakamura 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper provides theoretical, numerical, and experimental comparisons in electrical-drive performance between a double-star chopper-cells (DSCC) inverter and a triplestar bridge-cells (TSBC) converter. The inverter and converter are two of the most promising members of the modular multilevel cascade converter (MMCC) family. Two sets of downscaled electrical drives using the DSCC inverter and the TSBC converter are designed, constructed, and tested, along with the common three-phase four-pole induction motor rated at 380 V, 15 kW, and 50 Hz. This paper presents experimental waveforms of the electrical drives loaded with a quadratic torque-to-speed profile and at the rated torque.
Investigation and Analysis of the Occurrence of Rail Head Checks
Jin, Ying,Aoki, Fusayoshi,Ishida, Makoto,Namura, Akira The Korean Society for Railway 2009 International Journal of Railway Vol.2 No.2
Wear and rolling contact fatigue (RCF) defects are most important causes of rail damage, and often interaction competitive at present railway track. Head check is one of rolling contact fatigue (RCF) defects, and generally occurs in mild circular curves and transition curves that are set at both ends of sharp circular curves. Wear tends to limit the crack growth of head checks by removing the material from the RCF surface. In order to clarify the conditions of the occurrence and growth of head checks, the authors measured the interacting forces between wheels and rails and the angle of attack of wheelset, and carried out contact analyses using the actual profile data of wheels and rails. The effects of the lateral force, the contact geometry, and the wear rate at rail gauge comer on the formation of head checks were also analyzed by using the worn profiles of actual wheels and rails and the data obtained by a track inspection car. Some specific range of wear rate at the gauge comer was identified as having close relation with occurrence of head checks.
S OI 구조를 이용한 열전쌍열(Thermopile) 제작
이영태,Takao, Hidekuni,Ishida, Makoto 한국센서학회 2002 센서학회지 Vol.11 No.1
In this paper, a thermopile which is applied to wide uses of temperature measuring was fabricated and its characteristic was improved by appling SOI structure to the fabrication. We improved characteristic of the thermopile by using single crystal silicon strips that has high seebeck coefficient and dielectric isolating the silicon strips from substrate with silicon dioxide film which dramatically decrease thermal conductivity between hot and cold junction compared to a silicon strip which was fabricated by ion implantation. The thermopile consists of 17 p-type single crystal silicon strips and 17 n-types by serial connection. The result of electromotive force measuring showed very good characteristic as 130mV/K when temperature difference between the two ends of the thermopile occurs by applying light on the thermopile fabricated with silicon strips of 1600㎛ length, 40㎛ width, 1㎛ thickness.
Investigation and Analysis of the Occurrence of Rail Head Checks
Ying JIN,Fusayoshi AOKI,Makoto ISHIDA,Akira Namura 한국철도학회 2009 International Journal of Railway Vol.2 No.2
Wear and rolling contact fatigue (RCF) defects are most important causes of rail damage, and often interaction competitive at present railway track. Head check is one of rolling contact fatigue (RCF) defects, and generally occurs in mild circular curves and transition curves that are set at both ends of sharp circular curves. Wear tends to limit the crack growth of head checks by removing the material from the RCF surface. In order to clarify the conditions of the occurrence and growth of head checks, the authors measured the interacting forces between wheels and rails and the angle of attack of wheelset, and carried out contact analyses using the actual profile data of wheels and rails. The effects of the lateral force, the contact geometry, and the wear rate at rail gauge corner on the formation of head checks were also analyzed by using the worn profiles of actual wheels and rails and the data obtained by a track inspection car. Some specific range of wear rate at the gauge corner was identified as having close relation with occurrence of head checks.