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The Development of High Contact Fatigue Strength P/M Sprocket for the Silent Chain System
Yamanishi Yuuji,Tsutsui Tadayuki,Ishii Kei 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Recently, automotive engines have changed to the silent chain system in order to reduce noise and to improve reliability. High contact fatigue strength is needed for the sprockets of silent chain system. As a result, a high-contact-fatigue-strength P/M material was developed using the technology of surface rolling, which densifies the surface layer of sintered parts. It was established that the contact fatigue strength of the developed material was a great improvement over that of the conventionally used sintered material.
Role of Educational Technology for Contemporary Educational Issues
( Junichi Yamanishi ) 한국교육공학회 2014 한국교육공학회 학술대회발표자료집 Vol.2014 No.2
Japan Society for Educational Technology (JSET) founded in 1984 is a professional association of about three thousands of researcher, educators and others whose interests are directed toward improving and innovation of education such as learning environment and pedagogy. Then for JSET, it is the 30th anniversary memorable age this year. The object of the Educational Technology study is very wide range from an elementary, secondary and higher education to life-long study, furthermore, education in the company, in/non(outside) formal learning. These studies have played a big role to solve contemporary educational issues depend on national strategies such as e-Japan strategy, new IT reform strategy, future school and innovation of learning project to realize a vision of ICT in education. In this presentation, I report the present conditions of ICT in education and some problems in Japan, and new challenge at 30th anniversary in JSET.
In Vitro Experiment to Evaluate <sup>137</sup>Cs Dissolution in the Digestion Process of Mushrooms
Nishiono, Kanoko,Yamanishi, Hirokuni The Korean Association for Radiation Protection 2020 방사선방어학회지 Vol.45 No.4
Background: Several studies have reported that wild mushrooms contain high amounts of radioactive cesium (137Cs). After the Fukushima Daiichi Nuclear Power Plant Accident, a significantly high concentration of 137Cs has been detected in wild mushrooms, and their consumption may be the cause of the chronic internal exposure of local consumers to radioactivity. Therefore, an accurate evaluation of the internal radioactivity resulting from mushroom ingestion is needed. Materials and Methods: The 137Cs elution rate through the cooking and digestion stages was evaluated using in vitro experiments. The edible mushroom Pleurotus djamor was taken as a sample for the experiments. The mushrooms were cultivated onto solid media containing 137Cs. We evaluated the internal dose based on the actual conditions using the elution rate data. For various cooking methods, the results were compared with those of other wild edible mushrooms. Results and Discussion: From the elution experiment through cooking, we proved that 25%-55% of the 137Cs in the mushrooms was released during soaking, boiling, or frying. The results of a simulated digestion experiment after cooking revealed that almost all the 137Cs in the ingested mushrooms eluted in the digestive juice, regardless of the cooking method. The committed effective dose was reduced by 20%-75% when considering the dissolution through the cooking process. Conclusion: We found that cooking lowers 137Cs concentration in mushrooms, therefore reducing the amount of radioactivity intake. Besides, since there were differences between mushroom types, we demonstrated that the internal exposure dose should be evaluated in detail considering the release of 137Cs during the cooking stages.
JIANG, Zedong,KIM, Daekyung,YAMASAKI, Yasuhiro,YAMANISHI, Tomohiro,HATAKEYAMA, Tomomitsu,YAMAGUCHI, Kenichi,ODA, Tatsuya Japan Society for Bioscience, Biotechnology, and A 2010 Bioscience, Biotechnology, and Biochemistry Vol.74 No.8
<P>An <I>N</I>-acetylgalactosamine (GalNAc)-specific Ca<SUP>2+</SUP>-dependent lectin (C-type lectin), isolated from the marine invertebrate Holothuroidea (<I>Cucumaria echinata</I>), CEL-I, showed potent mitogenic activity toward normal mouse spleen cells. The mitogenic activity of CEL-I, which reached a maximum at 100 μg/ml, was inhibited by GalNAc in a concentration-dependent manner. The mitogenic effect of CEL-I at 10 μg/ml on T cell- enriched splenocytes was at a similar level due to a well-known T cell mitogen, concanavalin A (Con A), at 10 μg/ml. Furthermore, CEL-I evoked a mitogenic response from nude mouse spleen cells, while no significant effects of Con A on this cell population were observed over a wide range of concentrations. These results suggest that CEL-I is a potent mitogenic lectin with the ability to stimulate both T and B cells.</P>