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Low-dislocation-density large-diameter GaAs single crystal grown by vertical Bridgman method
Kawase, Tomohiro,Tatsumi, Masami,Fujita, Keiichiro The Korea Association of Crystal Growth 1999 韓國結晶成長學會誌 Vol.9 No.6
Low-dislocation-density large-diameter GaAs single crystals with low-residual-strain have been strongly required. We have developed dislocation-free 3-inch Si doped GaAs crystals for photonic devices, and low-dislocation-density low-residual-strain 4-inch to 6-inch semi-insulating GaAs crystals for electronic devices by Vertical Bridgman(VB) technique. We confirmed that VB substrates with low-residual-strain have higher resistance against slip-line generation during MBE process. VB-GaAs single crystals show uniform radial profile of resistivity reflecting to the flat solid-liquid interface during the crystal growth. Uniformity of micro-resistivity of VB-GaAs substrate is much better than of the LEC-GaAs substrate, which is due to the low-dislocation-density of VB-GaAs single crystals.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHTWATER REACTOR ANALYSES
AKIO YAMAMOTO,TOMOHIRO ENDO,MASATO TABUCHI,NAOKI SUGIMURA,TADASHI USHIO,MASAAKI MORI,MASAHIRO TATSUMI,YASUNORI OHOKA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculationmodels and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objectiveof the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysiscode, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validationefforts related to the AEGIS code.
김명수,Daisuke Iba,Tomohiro Tatsumi,Junichi Hongu,Ichiro Moriwaki 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.12
Gears used in actuators for robot articulations are showing a trend toward having smaller modules. Thus, profile measurements of small module gears are strongly desired. Our aim was to develop a probe artifact that enables ultra-fine-pitch cylindrical gears to be measured, by minimizing the size of the probe head. The configurations of the contact-type probe and holder were designed under consideration of interference with an adjacent tooth during profile measurements of an objective tooth. After manufacturing the artifact, a 0.1-module spur gear was measured as a trial, and reasonable results were obtained. In addition, a calibration plate for roughness was measured using the developed probe artifact. The evaluated roughness showed a strong correlation with the “true roughness”. Therefore, the developed probe can be expected to enable “pseudo” roughness to be evaluated.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHT WATER REACTOR ANALYSES
Yamamoto, Akio,Endo, Tomohiro,Tabuchi, Masato,Sugimura, Naoki,Ushio, Tadashi,Mori, Masaaki,Tatsumi, Masahiro,Ohoka, Yasunori Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculation models and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objective of the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysis code, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validation efforts related to the AEGIS code.