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Frictional Behavior ofr-Irradiated MoS₂Coating Film at Cryogenic Temperatures
Yoshino, Yasuhiro,Ishikawa, Kaneto,Shimizu, Tomoharu,Iwabuchi, Akira,Makoto, Sugimoto ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1999 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1999 No.-
Frictional problems in superconducting magnets are related to the stability and reliability of the magnets, because frictional heating causes quench of the manger and the frictional resistance determines the limit of the shear force at the contacting sufaces. In addition to these problems, magnet structural materials are exposed with neutron and γ-ray in Deutrium- Tritum type fusion reactor, so that it is required to investigate the frictional behavior for irradiated magnet structural materials at cryogenic temperatures. In this study, we investigated the influence of γ-irradiated MoS2 coating film and GFRP AT 4.2 K 77K AND 293 K under fretting conditions.
Kazuhiro Ikeda,Yoshihisa Shimizu,Saburo Matsui,Takuya Oguri,Makoto Sekida,Atsusi Kawata,Taketoshi Kusakabe 대한토목학회 2008 KSCE Journal of Civil Engineering Vol.12 No.2
In this study, we investigated the partition property of pyrene onto cell membrane using synthetic membrane vesicles consisted ofseveral phospholipids and the effect of natural organic matters (NOM) on the partition. Membrane fluidity and membrane phaseaffected partition coefficient (Pmw) of pyrene onto the membrane. Pmw was larger for the liposome in liquid crystalline phase > inripple phase > in gel phase. Pyrene did not undergo the steric interfere in partition onto the membrane used in this study. Negativecharge of the membrane did not affect Pmw of pyrene. Suwannee River Natural Organic Matter (NOM) and Nordic fulvic acidaffected the partition of pyrene onto the TRANSILmembrane. The reason was confirmed that NOM associated pyrene did notpartition onto the membrane. Low molecular weigh fraction of SRNOM had strong effect on the partition as much as high molecularweigh fraction. From calorimetrical analysis, it was found that SRNOM did not affect the fluidity of the dimyristoy-lphosphatidylcholine (DMPC) membrane.
Masahiko Hayashi,Toru Kaiwa,Yoshiaki Matsushima,Makoto Shimizu,Takekazu Ishida,Kazuo Satoh,Tsutomu Yotsuya,Hiromichi Ebisawa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
It is shown that the spatial resolution of scanning superconducting quantum interference device (SQUID) microscope, which is considered naively to be limited by the size of the pickup coil (typically grater than of the order of ㎛), can be improved by applying a mathematical transformation to the obtained data. The resolution of the image is improved at best to the scanning step size (can be less than of the order of ㎛) even in the presense of the noise. Problems to be solved in applying the method to visualize the uxons in superconducting network structures are discussed by use of numerical simulations and of real experimental data.
Michio Tanaka,Eisuke Yokota,Yoichiro Toyonaga2,Fumitaka Shimizu,Yoshiyuki Ishii,Makoto Fujime,Shigeo Horie 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.7
Purpose: To identify the parameters on noncontrast computed tomography (NCCT)that best predict the success of shock wave lithotripsy (SWL). Materials and Methods: We reviewed the records of 75 patients who underwent SWL for urinary calculi measuring 5 to 20 mm. Using NCCT images, we estimated the largest stone cross-sectional area and contoured the inner edge of the stone. Clinical outcome was classified as successful (stone-free or <4 mm in diameter) or failed (stone fragments, ≥4 mm). The impact of preoperative parameters was evaluated by univariate and multivariate analysis. Results: The overall success rate was 73.3%. Average stone attenuation value, stone length, and stone cross-sectional area in the success and failure groups were 627.4±166.5 HU (Hounsfield unit) vs. 788.1±233.9 HU (p=0.002), 11.7±3.8 mm vs. 14.2±3.6 mm (p=0.015), and 0.31±0.17 cm2 vs. 0.57±0.41 cm2 (p<0.001), respectively. In the multivariate analysis, stone attenuation value was the only independent predictor of SWL success (p=0.023), although stone cross-sectional area had a tendency to be associated with SWL success (p=0.053). Patients were then classified into four groups by using cutoff values of 780 HU for stone attenuation value and 0.4 cm2 for cross-sectional area. By use of these cutoff values, the group with a low stone attenuation value and a low cross-sectional area was more than 11.6 times as likely to have a successful result on SWL as were all other groups (odds ratio, 11.6; 95% confidence interval, 3.9 to 54.7; p<0.001). Conclusions: Stone attenuation value and stone cross-sectional area are good predictors of extracorporeal SWL outcome.
Effect of the Licorice Flavonoid Isoliquiritigenin on the Sleep Architecture and Profile in Mice
조승목,윤민석,김동수,김진수,양혜진,이창호,김인호,Makoto Shimizu,한대석 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.4
The sleep-promoting effect of isoliquiritigenin (ILTG) was investigated by analyzing the sleep architecture in mice. A hypnotic diazepam (DZP, 2 mg/kg) significantly decreased sleep latency by 39.7% and increased the amount of non-rapid eye movement sleep (NREMS) by 103.8%for the first 3 h after administration. ILTG (50 mg/kg) also produced a significant decrease in sleep latency (30.7%)and an increase in the amount of NREMS (61.1%). DZP significantly decreased delta (0.5-4 Hz) activity as compared with the vehicle; however, ILTG did not alter the delta activity. These results mean that ILTG induces sleep similar to physiological sleep without a decline in sleep quality.