start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=1-2 article-no= start-page=39 end-page=43 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000327 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Cytocompatibility of Silicone Elastomer Treated with Hydrogenperoxide Containing Tantalum Chloride en-subtitle= kn-subtitle= en-abstract= kn-abstract=Silicone elastomer was chemically treated at 60 for 7 days with 30 wt% H(2)O(2) solutions with or without TaCl(5) and soaked for various periods in a simulated body fluid(Kokubo solution) up to 21 days. Apatite formation ability of the surface of the silicone elastomer specimens was investigated with thin-film X-ray diffraction and FT-IR reflection spectroscopy. These silicone specimens did not deposit apatite or calcium phosphates, irrespective of chemical treatment. Osteoblast-like cells (MC3T3-El) derived from mouse were cultured on the specimens at 36.5 under 5%C0(2) and 95% humidity. Similar degree of proliferation of cells was observed at 7 days among three specimens, while the no treatment specimen after incubation for 5 days showed a lower degree of proliferation than the silicone treated with 30 wt% H(2)O(2) solutions with or without TaCl(5). Alkaline phosphatase activity of the cells proliferated on the no treatment specimen was lower than those of the silicone treated with 30 wt% H(2)O(2) solutions with or without TaCl(5). These results indicate that the cytotoxicity of the silicone could be improved by the chemical treatment with 30 wt% H(2)O(2) solutions with or without TaCl(5). en-copyright= kn-copyright= en-aut-name=HayakawaSatoshi en-aut-sei=Hayakawa en-aut-mei=Satoshi kn-aut-name=쑏 kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ShirosakiYuki en-aut-sei=Shirosaki en-aut-mei=Yuki kn-aut-name=RI kn-aut-sei= kn-aut-mei=RI aut-affil-num=2 ORCID= en-aut-name=YabutaTakeshi en-aut-sei=Yabuta en-aut-mei=Takeshi kn-aut-name=֓ci kn-aut-sei=֓c kn-aut-mei=i aut-affil-num=3 ORCID= en-aut-name=TsuruKanji en-aut-sei=Tsuru en-aut-mei=Kanji kn-aut-name=s kn-aut-sei=s kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=OhtsukiChikara kn-aut-sei=Ohtsuki kn-aut-mei=Chikara aut-affil-num=5 ORCID= en-aut-name=OsakaAkiyoshi en-aut-sei=Osaka en-aut-mei=Akiyoshi kn-aut-name=▾` kn-aut-sei= kn-aut-mei=` aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=Department of Bioscience and Biotechnology affil-num=2 en-affil= kn-affil=Department of Bioscience and Biotechnology affil-num=3 en-affil= kn-affil=Department of Bioscience and Biotechnology affil-num=4 en-affil= kn-affil=Department of Bioscience and Biotechnology affil-num=5 en-affil= kn-affil=Graduate School of Materials Science. Nara Institute of Science and Technology affil-num=6 en-affil= kn-affil=Department of Bioscience and Biotechnology END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=1-2 article-no= start-page=27 end-page=37 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000327 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Depolarization properties of Asian dust (KOSA) measured hyLIDAR in Okayama in the spring of 1998 en-subtitle= kn-subtitle= en-abstract= kn-abstract=In spring of 1998, Asian dust was observed with a Mie LIDAR in Okayama University, which can measure depolarization ratio. Three events of intense Asian dust were occurred in the period and medially detailed structure of atmosphere was found after examining records. Asian dust was distinguished from water droplets and the possibility to study three dimensional dynamic structure of atmosphere were demonstrated. en-copyright= kn-copyright= en-aut-name=WeiHe en-aut-sei=Wei en-aut-mei=He kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=KogaRyuji en-aut-sei=Koga en-aut-mei=Ryuji kn-aut-name=Éꗲ kn-aut-sei=É kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=IokibeKengo en-aut-sei=Iokibe en-aut-mei=Kengo kn-aut-name=ܕS kn-aut-sei=ܕS kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=WadaOsami en-aut-sei=Wada en-aut-mei=Osami kn-aut-name=acC kn-aut-sei=ac kn-aut-mei=C aut-affil-num=4 ORCID= en-aut-name=ToyotaYoshitaka en-aut-sei=Toyota en-aut-mei=Yoshitaka kn-aut-name=Lc[F kn-aut-sei=Lc kn-aut-mei=[F aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Graduate school of natural science and technology affil-num=2 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=3 en-affil= kn-affil=Graduate school of natural science and technology affil-num=4 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=5 en-affil= kn-affil=Department of Electrical and Electronic Engineering en-keyword=Mie lidar kn-keyword=Mie lidar en-keyword=Asian dust (KOSA) kn-keyword=Asian dust (KOSA) en-keyword=depolarization ratio kn-keyword=depolarization ratio en-keyword=backscattering ratio kn-keyword=backscattering ratio en-keyword=range normalized kn-keyword=range normalized END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=1-2 article-no= start-page=19 end-page=26 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000327 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Energy Distribution in Electrical Discharge Machining with Graphite Electrode en-subtitle= kn-subtitle= en-abstract= kn-abstract=In EDM, the machining characteristics greatly depend on the energy distribution. Therefore, it is very important to clarify the energy distribution for understanding various phenomena in EDM. In this paper, the energy distribution in EDM with graphite electrode is investigated by measuring the temperatures of electrode and workpiece. Experimental analysis shows that the material removal rate depends on energy density while the electrode wear greatly depends on the adhesion of heat resolved carbon from machining fluid, and the energies distributed into electrode and workpiece are almost constant regardless of pulse duration. en-copyright= kn-copyright= en-aut-name=OkadaAkira en-aut-sei=Okada en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=UnoYoshiyuki en-aut-sei=Uno en-aut-mei=Yoshiyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=OkajimaIsao en-aut-sei=Okajima en-aut-mei=Isao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Graduate School of Natural Science and Technology END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=1-2 article-no= start-page=13 end-page=17 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000327 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Effect of Specimen Thickness on Aging and Fatigue Strength of Al-Zn Alloys en-subtitle= kn-subtitle= en-abstract= kn-abstract=Repeated tensile fatigue strength of the low temperature age-hardened Al-Zn alloys is investigated varying the specimen thickness. Fatigue strength of the age-hardened specimens decreases with the specimen thickness when the specimen is thinner than a certain thickness, whereas fatigue strength of non age-hardened specimens, i.e., pure aluminum and dilute Al-Zn alloy, does not depend the specimen thickness. The dependence of fatigue strength on the thickness of age-hardened specimen is considered to be caused by the decrease of the strength of specimen as a whole, as a result of increase in volume ratio of the soft surface layer formed after age-hardening with decreasing specimen thickness. en-copyright= kn-copyright= en-aut-name=SakakibaraAkira en-aut-sei=Sakakibara en-aut-mei=Akira kn-aut-name=匴 kn-aut-sei=匴 kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TanimotoTadashi en-aut-sei=Tanimoto en-aut-mei=Tadashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MatsushimaTakahisa en-aut-sei=Matsushima en-aut-mei=Takahisa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HosokawaNorio en-aut-sei=Hosokawa en-aut-mei=Norio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KanadaniTeruto en-aut-sei=Kanadani en-aut-mei=Teruto kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering, Okayama University of Science affil-num=3 en-affil= kn-affil=Graduate School of Okayama University of Science (Present: Daiwabo Co., Ltd.) affil-num=4 en-affil= kn-affil=Department of Mechanical Engineering, Okayama University of Science affil-num=5 en-affil= kn-affil=Department of Mechanical Engineering, Okayama University of Science END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=1-2 article-no= start-page=1 end-page=12 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000327 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Falling Snow Melting Characteristics of Warm Water Flowing along Sheet Channels Spread on a Roof en-subtitle= kn-subtitle= en-abstract= kn-abstract=The experiment for investigating the falling snow melting characteristics of warm water flowing along sheet channels spread on a roof was performed in Tookamachi city, Nigata prefecture from February 6 to February 7, 1995. The sheet surface temperatures at 11 positions in 3 channels were measured. A physical model for a gas-water-snow system was constructed to compare the predicted results with the measured ones. A fully spread uniform water film in the sheet channel was observed in the experiments. The experimental results elucidated that it was feasible to use warm water flowing along sheet channels for melting falling snow on roofs. The temperature drop in the sheet channel mainly depended on the snowfall intensity, atmospheric temperature and wind speed. Under the influence of the roof edge, the temperature drop in the channel next to the side edge was much larger than that in middle channels. A water-snow two phase flow or a snow covered frozen water was experienced temporarily in the lower reaches of the water flowing channel. These suggest that a larger water flow rate is needed for the channel next to the roof edge, and a higher inlet temperature or a greater water flow rate is required for a severe weather condition. There was reasonably good agreement between the measured and predicted water temperatures. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SongBaoyin kn-aut-sei=Song kn-aut-mei=Baoyin aut-affil-num=1 ORCID= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=tpj kn-aut-sei=t kn-aut-mei=pj aut-affil-num=2 ORCID= en-aut-name=HoribeAkihiko en-aut-sei=Horibe en-aut-mei=Akihiko kn-aut-name=xF kn-aut-sei=x kn-aut-mei=F aut-affil-num=3 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TakahashiTakashi kn-aut-sei=Takahashi kn-aut-mei=Takashi aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Graduate School of Natural Science and Technology affil-num=3 en-affil= kn-affil=Graduate School of Natural Science and Technology affil-num=4 en-affil= kn-affil=Patedision Co. Ltd. END