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Neutrino burst and gravitational wave from supernova explosions
Katsuhiko Sato,Kei Kotake,Keitaro Takahashi,Shin'ichiro Ando 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The time prole and energy spectrum of a neutrino burst from supernovae is greatly modied by the eect of neutrino oscillations. We review how these conversions happen in a supernova mantle and how the burst could be detected by SK (Super-Kamiokande) and SNO (Sudbury Neutrino Observatory). We show that implications for neutrino parameters (mass hierarchy and the mixing angle between mass eigenstate 1; 3), can be obtained if a supernova appears at the Galactic Center. We also discuss the eects of neutrino oscillation on the supernova relic neutrino observations. In the end, we discuss the gravitational radiation from the rotating stellar cores, which will give us the information of the angular momentum distribution for evolved massive stars.
Naohiro Nishikawa,Katsuhiko Omoe,Kenji Murakami,Yusuke Sato,Takekazu Sawa,Yoshihiro Hagihara,Nobuhito Yoshihara,Hiroaki Okawai,Toshirou Iyama,Masahiro Mizuno,Shinya Tsukamoto 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
It is great concern that is environmental load in manufacturing. In machining site, metal working fluid (coolant) such as cutting oil,grinding fluid is used. It contains several chemicals that are oil, surface active agent, extreme pressure additive, antirust agent,antifoaming agent, preservative, biocide etc.. It is thought that it is not good for environment and human body. Machining fluid mist and splash contained several chemicals that are cause of danger for worker’s health while machining. Furthermore, time elapses, fluid is rotten by bacteria. Bad smell and degradation of machining performance occurs. Therefore, after using machining fluid, waste fluid is disposed. Incineration or coagulative precipitation and landfill etc. are necessary. It arise great disposal cost and environmental load as discharging of huge amount green house gas (CO2 etc.). Then, machining fluid decreasing or non-using is demanded in industry. So, in this investigation, new environmental machining method: the electric rust preventive machining method system that uses only water as machining fluid has been developed. In this paper, water purification recycle system in water machining system development is mentioned. Therefore, complete removal of bacteria (Enterobacter aerogenes) without using chemicals such as biocide is examined for corruption, malodor prevention and safe machining water.
Sueyoshi, Mitsuhiro,Furue, Toshihiko,Sato, Akihiro,Yokoyama, Kenichi,Yamadera, Yoshimi,Fujiwara, Kiyoshi,Matsuda, Katsuhiko 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
Aluminum brass tubing which is highly cost-effective and has a high heat transfer property has been widely used for seawater cooled condenser in Japan. However, the tubing suffers from erosion and corrosion on the inner surface in spite of ferric-ion injection and cathodic protection. Ammonia also attacks the outer surface after long years of service. Periodic replacement with new tubing has been performed. Titanium tubing which has high corrosion resistance, has been used in new condensers and for the air removal zone of the condenser. However, its service has been restricted due to higher cost and lower elastic modulus. As a countermeasure, we have developed a high performance ferritic stainless steel tubing called "Super Stainless: FS1O" which has excellent corrosion resistance and is highly cost-effective. First, the tubings were used experimentally in our Buzen thermal power station, Unit 2 condenser in 1993, and various investigations have been performed on the extracted tubing and tube sheet every year. Ammonia attack on the outer surface, corrosion and erosion on the inner surface, crevice corrosion between the tube and the tube-sheet. Hz absorption and degradation of properties was not observed. Based on these results, 1,006 pieces of FS1O were installed in Buzen thermal power station, Unit I condenser in 1996. The tubing has been used in seawater without any corrosion problems.
조상호(Sang-Ho Cho),中村圭太(Keita Nakamura),川崎了(Simai Kawasaki),양형식(Hyung-Sik Yang),佐藤稔紀(Minoriki Sato),中間茂雄(Shikeyun Nakama),金子 勝比古(Katsuhiko Kaneko) 한국암반공학회 2004 터널과지하공간 Vol.14 No.2
지층지형에 의한 암반 불균질성이 3차원 응력장에 미치는 영향을 고찰하기 위해서, 등방 직육면체모델, 평탄한 지층을 가진 직육면체모델, 오목한 지층을 가진 직육면체모델에 대해서 3차원 유한요소해석을 수행하였다. 해석결과로부터, 지반 내에 존재하는 지층의 형상은 암반 내 광역응력장에 큰 영향을 미치고 있음을 명확히 하였다 현장계측결과로부터 광역응력장을 역해석하는 광역응력장 평가법에 지표면을 가진 균질모델과 지표면과 지층지형을 가진 불균질 모델을 적용하고 지층지형에 의한 암반 불균질성이 현장계측결과에 미치는 영향을 고찰하였다. 추가로, 지층지형 모델을 고려한 광역응력장 평가법의 타당성에 대해서 검토하였다. To investigate the influence of the rock mass inhomogeneity caused by layer geometry on the regional stress distribution, the rectangular models considering a homogenous rock mass, inhomogeneous rock mass with plane layers and with uneven layers were analyzed and discussed. It was confirmed that the structure and existence of layers in rock mass affected the regional stress distribution. An approach based on an inverse analysis of the measured local stresses and the 3D finite element analysis was suggested, and used to estimate the regional stress field of the homogeneous and inhomogeneous models, which consist of the surface geometry of ground and both the surface and layer geometry respectively. Additionally, the approach of the regional stress considering the layer geometry in the rock mass was verified to estimate the regional stress field for a site.