Search Results:  1-20 of 2938

  • 1

    Theoretical considerations on efficiency degradation due to thermal effect in a planar GaN-based LED with a GaN substrate

    Sato-Iwanaga Junko , Liu Yang , Dutton Robert , Tsuchiya Hideaki , Yokogawa Toshiya

    … In this paper, using a fully-coupled, three-dimensional electro-thermal device simulator, we study the mechanism of efficiency degradation at high current operation in planar GaN-based light emitting diodes (LED). … Then, we introduced thicker conductive GaN substrates and simulated distributions of the current density and temperature inside the substrate. … Therefore, the maximum junction temperature decreases, and then IQE and the driving voltage are improved. …

    Jpn. J. Appl. Phys. 53(10), 102101, 2014-09-16

    The Japan Society of Applied Physics

  • 2

    Recent progress of GaN power devices for automotive applications

    Kachi Tetsu

    … To improve the efficiency of HVs and EVs, better performance characteristics than those of Si power devices, for example, lower on-resistance, higher speed, higher operation temperature, are required for the power devices. … A lateral GaN power device with a blocking voltage of 600 V and a vertical GaN power device with a blocking voltage of 1200 V are suitable for medium power applications for sub systems and high-power applications for the drive of main motors, respectively. …

    Jpn. J. Appl. Phys. 53(10), 100210, 2014-09-05

    The Japan Society of Applied Physics

  • 3

    InGaN based green laser diodes on semipolar GaN substrate

    Adachi Masahiro

    … The reduction of piezoelectric fields in InGaN quantum wells on the [Formula: see text] planes was investigated by a small blue shift in electroluminescence peaks, and high crystal quality was confirmed by clear interfaces in a transmission electron microscopy image, narrower FWHM in electroluminescence peaks, and smaller localization energy in time resolved PL results, as compared with the other planes. …

    Jpn. J. Appl. Phys. 53(10), 100207, 2014-09-04

    The Japan Society of Applied Physics

  • 4

    Packaging Technology for High Temperature Operation of Power Semiconductor Modules  [in Japanese]

    両角 朗 , 西村 芳孝 , 池田 良成 [他]

    エレクトロニクス実装学会誌 = Journal of the Japan Institute of Electronics Packaging 17(6), 464-468, 2014-09

  • 5

    Fabrication and High-Temperature Operation of InAs/GaAs Quantum Dot Lasers on Silicon by Wafer Bonding  [in Japanese]

    田辺 克明 , 荒川 泰彦

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(187), 51-54, 2014-08-21

  • 6

    Fabrication and High-Temperature Operation of InAs/GaAs Quantum Dot Lasers on Silicon by Wafer Bonding  [in Japanese]

    田辺 克明 , 荒川 泰彦

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(186), 51-54, 2014-08-21

  • 7

    Fabrication and High-Temperature Operation of InAs/GaAs Quantum Dot Lasers on Silicon by Wafer Bonding  [in Japanese]

    田辺 克明 , 荒川 泰彦

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(185), 51-54, 2014-08-21

  • 8

    Fabrication and High-Temperature Operation of InAs/GaAs Quantum Dot Lasers on Silicon by Wafer Bonding  [in Japanese]

    田辺 克明 , 荒川 泰彦

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(184), 51-54, 2014-08-21

  • 9

    Fabrication and High-Temperature Operation of InAs/GaAs Quantum Dot Lasers on Silicon by Wafer Bonding  [in Japanese]

    田辺 克明 , 荒川 泰彦

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 114(183), 51-54, 2014-08-21

  • 10

    Control Technique of Solidus Temperature on Gold Base Solder for SiC Devices with High Temperature Operation  [in Japanese]

    高橋 弘樹 , 村上 善則 , 安在 岳士 [他]

    スマートプロセス学会誌 = Journal of smart processing 3(4), 205-211, 2014-07

  • 11

    Gray-box modeling for prediction and control of molten steel temperature in tundish

    Ahmad Iftikhar , Kano Manabu , Hasebe Shinji , Kitada Hiroshi , Murata Noboru

    … To realize stable production in the steel industry, it is important to control molten steel temperature in a continuous casting process. … The present work aims to provide a general framework of gray-box modeling and to develop a gray-box model that predicts and controls molten steel temperature in a tundish (TD temp) with high accuracy. …

    Journal of Process Control 24(4), 375-382, 2014-04

    IR CrossRef

  • 12

    Observation of water transport in the micro-porous layer of a polymer electrolyte fuel cell with a freezing method and cryo-scanning electron microscope

    Aoyama Yusuke , Suzuki Kengo , Tabe Yutaka , Chikahisa Takemi

    … the freezing method enables immobilization of the liquid water in the cell as ice forms by the freezing, and the cryo-SEM can visualize the water distribution in the vicinity of the MPL at high resolution without the ice melting. … It was shown that no liquid water accumulates inside the MPL in operation at 35 degrees C, while the pores of the MPL are filled with liquid water under very low cell temperature operation, at 5 degrees C. …

    Electrochemistry Communications 41, 72-75, 2014-04

    IR CrossRef

  • 13

    Gangrene of the Penis Due to Strangulation by a Rubber Band : A Case Report  [in Japanese]

    佐々木 雄太郎 , 小田 眞平 , 藤方 史朗 , 谷本 修二 , 菅 政治

    … After five days, he was taken to our hospital in an ambulance for high temperature and general malaise. … After the operation, he completely recovered. …

    泌尿器科紀要 = Acta urologica Japonica 60(3), 155-157, 2014-03


  • 14

    AlN/AlGaN HEMTs on AlN substrate for stable high-temperature operation

    Yafune N. , Hashimoto S. , Akita K. , Yamamoto Y. , Tokuda H. , Kuzuhara M.

    … We demonstrate an AlN/AlGaN high-electron-mobility transistor (HEMT) fabricated on a free-standing AlN substrate. … Negligible drain current degradation was observed at temperatures from 300 to 573 K, emonstrating that our AlN/AlGaN approach on an AlN substrate is promising for stable high-temperature operation. …

    Electronics Letters 50, 211-212, 2014-01-30


  • 15

    Low NOx Burner for Coal Fired Steam Generator  [in Japanese]

    Amano Iwamaro , Kokuryo Shigeharu , Matsumoto Keigo

    石炭焚きボイラは1979年の第2次オイルショック以降燃料の多様化を図るために発電事業用及び産業用のボイラに広く使用されるようになった。将来を通して安定した供給が見込まれる石炭を燃料としたボイラはCO2排出量を低減するため,その性能の向上が求められるようになった。<BR>産業用ボイラにおいてはユーティリティとしてボイラから発生させた蒸気を使用する場合が多く,蒸気条件に依存しない燃焼排ガス …

    JAPAN TAPPI JOURNAL 68(6), 625-628, 2014

    J-STAGE CrossRef

  • 16

    Fundamental Study of Sn Removal from Hot Metal by NH3 Gas Blowing

    Sasaki Naotaka , Uchida Yu-ichi , Miki Yu-ji , Matsuno Hidetoshi

    … In the present study, Sn removal from high-S hot metal by NH3 gas blowing was investigated in laboratory experiments as a new method of Sn removal. … Within the ranges of these experiments, higher temperature and higher concentrations of S and N were advantageous for Sn removal. … In the estimation of Sn removal ratio in plant-scale operation, it could reach 40%. …

    ISIJ International 54(8), 1807-1812, 2014

    J-STAGE CrossRef

  • 17

    Fuel Savings from an Operating Condition Indicator on Agricultural Tractors

    TESHIMA Tsukasa , GOTOH Takashi , SUGIURA Yasuroh , TAKAHASHI Hiroyuki , SHIMIZU Kazufumi , SEKI Ei

    … In fundamental tests, we revealed that work power could be estimated based on measured values for engine speed and exhaust-gas temperature during the operation of an agricultural tractor. … This device employed five operating areas according to engine speed and work power and was designed to indicate changes in operating conditions (travel speed gear, PTO gear and engine speed) to ensure the tractor would operate within a region enabling high fuel efficiency and low exhaust-smoke density. …

    Japan Agricultural Research Quarterly: JARQ 48(3), 253-259, 2014

    J-STAGE CrossRef

  • 18

    Design, Fabrication, and Persistent Current Operation of the REBCO Floating Coil for the Plasma Experimental Device Mini-RT

    OGAWA Yuichi , MORIKAWA Junji , UCHIJIMA Kenichiro , HOSAKA Yuichiro , KAWAI Chika , IBANO Kenzo , MITO Toshiyuki , YANAGI Nagato , NATSUME Kyohhei , TERAZAKI Yoshiro , IWAKUMA Masataka , TOMIOKA Akira , NOSE Shinichi

    High-temperature superconductor technology has become remarkably advanced, and components such as current leads and magnets have been explored for their applicability to fusion. … Especially, REBa2Cu3O7-δ (RE = rare-earth: REBCO) tape has been developed in research fields other than fusion, because of superior performance of REBCO in high magnetic fields. …

    Plasma and Fusion Research 9(0), 1405014-1405014, 2014

    J-STAGE CrossRef

  • 19

    Japans First In-grid Demonstration of a High-Tc Superconducting Cable System  [in Japanese]

    Maruyama Osamu , Nakano Tetsutaro , Honjo Shoichi , Watanabe Michihiko , Ohya Masayoshi , Masuda Takato , Yaguchi Hiroharu , Nakamura Naoko , Machida Akito

    High-temperature superconducting (HTS) power cable has significant merits of compactness and large power transmission capacity. … The in-grid operation had continued for more than one year without any accidental interruption of the operation or troubles of the system. … It is concluded that the HTS cable system has good performance and stability for long term in-grid operation. …

    IEEJ Transactions on Power and Energy 134(8), 639-647, 2014

    J-STAGE CrossRef

  • 20

    Continuous Temperature Measurement of Liquid Iron and Slag Tapped from a Blast Furnace

    SUGIURA Masato , OTANI Yohei , NAKASHIMA Masato , OMOTO Nobuhisa

    Temperature measurements of liquid pig iron coming out of a blast furnace are essential for estimating the thermal condition in the hearth. … The temperature is generally monitored by a disposable thermocouple on a runner. … This paper proposes radiometric temperature measurement that targets an iron-slag-mixed stream in front of a taphole. … Liquid iron and slag are spatially separated on a thermal image obtained by a CCD camera with a high-speed electronic shutter. …

    SICE Journal of Control, Measurement, and System Integration 7(3), 147-151, 2014

    J-STAGE CrossRef