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Strongly correlated electrons on frustrated lattices
Tsunetsugu, H,Hattori, K,Ohashi, T,Kawakami, N,Momoi, T Institute of Physics 2009 Journal of physics. Conference series Vol.145 No.1
<P>We review our two recent theoretical works on strongly correlated electrons on typical frustrated lattices. The first topic is about a Mott transition in the single-band Hubbard model on anisotropic triangular lattice, and we discuss a reentrant behaviour of metal-insulator transition, consistent with that in a κ-type BEDT-TTF salt. The second topic is about heavy fermion behaviour in the vanadium spinel LiV<SUB>2</SUB>O<SUB>4</SUB>. We study the 3-orbital t<SUB>2<I>g</I></SUB> Hubbard model on the pyrochlore lattice at quarter filling and derive its low-energy effective model. The correlations of spin and orbital degrees of freedom are discussed.</P>
Fabrication of Deep-Sub-Millimeter-Thick Compacts Using Spark Plasma Sintering
Ohashi T.,Tanaka T.,Oshiro K.,Fujimori H.,Kurisu H.,Matsuura M.,Yamamoto S. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Nd-Fe-B type powder was sintered using spark plasma sintering method. Fabricated compact sintered at the temperature of , is found to be a composite magnet with Nd-Fe-Co-B and . The compact sintered at shows slightly low coercivity and large remanent magnetization comparing to the compact sintered at due to the formation of phase, resulting in the large maximum energy product. Maximum energy product tends to decrease with decreasing thickness of sintered compacts below 0.5 mm in thickness.
Toi, M.,Ohashi, Y.,Seow, A.,Moriya, T.,Tse, G.,Sasano, H.,Park, B. W.,Chow, L. W. C.,Laudico, A. V.,Yip, C. H.,Ueno, E.,Ishiguro, H.,Bando, H. Oxford University Press 2010 Japanese journal of clinical oncology Vol.40 No.suppl1
<P>EPIDEMIOLOGY OF BREAST CANCER: The incidence and mortality of breast cancer are lower in Asia than in the West, particularly in post-menopausal women, but they are increasing. The age patterns of the incidence of breast cancer in Asia differ from in the West: in most Asian countries the peak incidence of breast cancer is at about age 45-50, whereas in western countries the incidence continues to increase even at older ages. Mortality is decreasing in western countries, whereas it is still increasing in Asian nations. There are many epidemiological factors involved in breast cancer, and important known risk factors include diet, obesity and diabetes. Asian studies found that high intake of isoflavones reduced the risk of breast cancer. PATHOLOGY OF BREAST CANCER: With regard to the pathology of breast cancer, for the molecular subtype, luminal A and luminal B are being used, while HER2 expression and rapid proliferation are also employed. Study results showed a somewhat higher prevalence of luminal A in Japanese compared with Americans. Ductal carcinoma in situ breast cancer is less frequent in Asian breast cancer patients than in Americans. The Working Group resolved to establish an international committee for pathological assessment of breast cancer in Asia. TREATMENT OF BREAST CANCER: Pharmacokinetics-pharmacodynamics studies are needed between ethnic backgrounds, investigating aromatase inhibitors and tamoxifen (endoxifen), as well as the effects of demographic factors such as diet, medical care, body mass index, etc. Correlations between adverse events and the clinical outcome also need to be studied.</P>
고온 고압 수 환경에서 인코넬 600 의 부식 피로 균열 성장 거동
남태운,맹완영,강영환,Ohashi, S .,Ishihara, T . 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.10
It is important to predict the corrosion fatigue crack growth rate of Inconel 600 for the structural integrity of nuclear power plants. In order to evaluate the corrosion fatigue crack growth rate of Inconel 600 in various applied load types, 3 different types of cracking loads which simulate corrosion fatigue, SCC and mixed mechanism of corrosion fatigue and SCC were applied to CT type Inconel 600 specimens in high temperature water at 290℃ with 4ppm dissolved oxygen concentration. There was synergistic effect on corrosion fatigue crack growth rate when mixed mode of SCC and corrosion fatigue load is applied to Inconel 600 specimens in the environment. The measured crack growth rate of the specimen to which mixed load were applied wsa faster than the predicted crack growth rate based on the superposition model. The increase in the crack growth rate indicates that there is sysnersistic interaction of fracture process at the growing crack tip which experiences mixed load of SCC and corrosion fatigue. So it is necessary to account for the synergistic acceleration of corrosion fatigue crack growth to predict the life of structural components of Inconel 600 alloys in corrosive environments.
New Defect Control for Extremely Long-Lived Widegap-White Light Emitting Diodes
K. Ando,Y. Hashimoto,K. Kanzaki,S. Ohashi,Y. Morita,T. Abe,H. Kasada,M. Adachi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
A new current pulse-width control for long-lived ZnSe-white LEDs is presented. Using the defect controlling technique together with high quality ZnSe white LED, it is proved that bright ZnSe white LEDs have exhibited long device life-time exceeding 20000 hrs for its in practical use. It is also evidenced that the present current pulse-width control is not limited in the ZnSe system, but very effective for other widegap semiconductor bright and long-live light emitting devices of GaN and ZnO.
Nucleation of CVD Diamond on Various Substrate Materials
Fukunaga, O.,Qiao, Xin,Ma, Yuefei,Shinoda, N.,Yui, K.,Hirai, H.,Tsurumi, T.,Ohashi, N. The Korean Ceramic Society 1996 The Korean journal of ceramics Vol.2 No.4
Diamod nucleation by mw assisted CVD was examined various conditions namely, (1) diamond nucleation on variour substrate materials, such as Si, cubic BN, pyrolytic BN and AIN, (2) AST(Activated species transport) method which promote nucleation of diamond on single crystal and polycrystalline alumina substrate was developed. (3) Effect of bias enhancement of nucleation on single crystalline Si was examined, and finally (4) DST (Double step treatment) method was developed to enhance diamond nucleation on Ni. In this method, we separated carbon diffusing process into Ni, carbon precipitating process from the inside of Ni and diamond precipitation process.