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RISS 인기검색어
- 검색키워드
- 저자 : Yukitake, Jun (검색결과 4 건)
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Highly Anisotropic Dielectric Behavior of Bi2Sr2Dy(Cu1−xZnx)2O8
M. Maki,C. Yukitake,S. Yufu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed low-frequency dielectric measurements on Bi2Sr2DyCu2O8 (Dy-Bi2212) singlecrystals in order to investigate the charge carrier dynamics near the insulator-to-metal transition. The in-plane dielectric constant (the real part of complex permittivity) "0ab exhibits large values ofmore than 104, probably due to the spatial distribution of the charges trapped within the CuO2planes. Along the c axis, we found an anomalous enhancement in "0c at 250 K. Zn impuritydoes not affect the "0c behavior, suggesting that the out-of-plane polarizability is not related to theantiferromagnetic ordering of Cu spins.
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Study on strength of reinforced concrete filled circular steel tubular columns
Hai-Jun Wang,Akira Hasegawa,Wei Hua,Yukitake Shioi,Shoji Iwasaki,Yutaka Miyamoto 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6
Concrete filed steel tubular columns (CFT) are widely used in civil engineering works,especially in large scale of works because of high strength, deformation, toughness and so on. On thein Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate.Then, a new kind of structure appeared, that is, reinforced concrete filed steel tubular column (RCFT). Inthis paper, compresion test and bending-shearing test on RCFT are carried out. The main parameters of(4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters onmechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula forRCFT column is proposed and tested by experimental results and existed recommendations (AIJ 197).proposed evaluation formula can evaluate the strength of RCFT column properly.
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Inhibitory Effects of Low-Dose Aloe-Emodin on the Development of Colorectal Tumors in Min Mice
Shimpo, Kan,Chihara, Takeshi,Kaneko, Takaaki,Beppu, Hidehiko,Wakamatsu, Kazumasa,Shinzato, Masanori,Yukitake, Jun,Sonoda, Shigeru Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.14
Aloe-emodin (AE), a natural anthraquinone compound, has been reported to exhibit anticancer activity in various cancer cell lines and anti-inflammatory effects in murine macrophages. In the present study, we investigated the cancer chemopreventive effects of AE in an Apc-deficient Min mouse model. In the first experiment, male Min mice were fed a basal diet or diets containing 5 ppm AE and 10 ppm AE for 12 weeks. The dietary administration of 5 ppm AE significantly reduced the number of colorectal tumors. In a second experiment, we investigated the effects of AE on colitis-related colon carcinogenesis in Min mouse treated with dextran sodium sulfate (DSS). Female Min mice were administered 1% DSS in their drinking water for 7 days. AE was given to mice in their diet at a dose of 5 or 50 ppm for 5 weeks. Feeding with AE significantly reduced the number of colorectal tumors. When proliferation of cells in normal-appearing colonic mucosa was assessed by monoclonal anti-rat Ki-67 antibody (MIB-5) immunohistochemistry in experiments 1 and 2, the AE treatment significantly decreased the mean MIB-5-labeling index. These results suggest that the dietary administration of low-dose AE may have chemopreventive effects against development of colorectal tumors in Min mice, possibly in part by reducing cell proliferation in colorectal mucosa.
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Study on strength of reinforced concrete filled circular steel tubular columns
Hua, Wei,Wang, Hai-Jun,Hasegawa, Akira,Shioi, Yukitake,Iwasaki, Shoji,Miyamoto, Yutaka Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6
Concrete filled steel tubular columns (CFT) are widely used in civil engineering works, especially in large scale of works because of high strength, deformation, toughness and so on. On the other hand, as a kind of strengthening measure for seriously damaged reinforced concrete piers of viaduct in Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate. Then, a new kind of structure appeared, that is, reinforced concrete filled steel tubular column (RCFT). In this paper, compression test and bending-shearing test on RCFT are carried out. The main parameters of experiments are (1) strength of concrete, (2) steel tube with or without rib, (3) width-thickness ratio and (4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters on mechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula for RCFT column is proposed and tested by experimental results and existed recommendations (AIJ 1997). The strength calculated by the proposal formula is in good agreement with test result. As a result, the proposed evaluation formula can evaluate the strength of RCFT column properly.
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