Journal of Advanced Science
Online ISSN : 1881-3917
Print ISSN : 0915-5651
ISSN-L : 0915-5651
20 巻 , 1+2 号
選択された号の論文の9件中1~9を表示しています
Paper
  • Takumi MIYAZAWA, Ichiro FUKUMOTO
    2008 年 20 巻 1+2 号 p. 1-6
    発行日: 2008年
    公開日: 2008/08/12
    ジャーナル フリー
    Traffic accidents caused by drowsiness have become a large social problem. In this study, we aimed to develop a drowsiness detection system by heart rate variability. Eight subjects particiated in this study. Silent experimental room made them drowsy. The electrocardiogram, the electroencephalogram, the electro-oculogram, the respiration and the pulse wave were measured as physiological indices. The sampling frequency was 2,000 Hz. Video pictures of subjects were taken to monitor their body motion and aspect. Simultaneously, Visual Analog Scale (VAS) was used as a subjective assessment. Heart rate fluctuation was detected using the variance of threshold level that was set by the R-R intervals. The detected zone of drowsy state was assessed by the electroencephalogram and the electro-oculogram. It was only six subjects. Tow subjects could not detect the heart rate fluctuation. The variance of threshold level needs to be improved. We proposed drowsiness detection system using the simple threshold level. This system suggested the possibility to detect the drowsy state.
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Paper
  • Yasuo ISHIKAWA, Rie ISHII, Sumitsuna HATAKEYAMA, Masashi KASAI, Masao ...
    2008 年 20 巻 1+2 号 p. 11-15
    発行日: 2008年
    公開日: 2008/08/12
    ジャーナル フリー
    We established three cell lines from medaka embryos. In the present study, we investigated the optimal conditions for growth of these cells with regard to the basal culture medium and concentration of fetal bovine serum (FBS). The best cell growth for all three cell lines was achieved with a 1:1 mixture of L15 medium and 199 medium with a relatively high concentration (20%) of FBS. The growth curves for the cell lines revealed that their doubling times ranged from 48 to 93 h. We also analyzed the numbers of chromosomes in the cell lines and found that their numbers varied from near-diploid to hyper-tetraploid. The results of the present study should be helpful for research in fish cell culture.
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  • Yuta KOTANI, Ryohta UMEBORI, Koichi HAYAKAWA, Yusuke ONO, Yoshihito MA ...
    2008 年 20 巻 1+2 号 p. 29-32
    発行日: 2008年
    公開日: 2008/12/19
    ジャーナル フリー
    Titanium nitride TiN has considerable hydrogen impermeability and is expected as a prevention coating of hydrogen gas parmiation for a cladding tube of metal hydride fission fuel. The TiN coating produced with plasma process is very complicated because the cladding tube is not wide enough to create stable plasma. A simple reactive evaporation process was selected for coationg process of TiN films to inner wall of narrow tube or stainless steal tube. The films were thermally deposited on stainless steel sheets coiled around inner wall of silica glass tubes. Nitrogen as a reactive gas was introduced into the vacuum chamber with pressure range of 5.0×10-2 Pa ∼ 3.0×10-1 Pa. Thin films with gold color were obtained. From XRD measurement of films, distinct diffraction patterns of TiN phase were observed. A reactivity of N2 gas molecules with Ti atoms in Ti-N film formation has measured quantitatively. The reaction probability of N2 molecules rN2 is defined as the ratio of the absorbing rate of N2 on Ti surface AN2 to the rate of N2 impingement ZN2. Reactive evaporation process exhibits the highest N2 reaction probability rN2 ≅ 0.05. It was the similar value of rN2 with Ti film prepared by ARE plasma processes.
Paper
  • Jamadil Azwad PAZAER, Koji MAKITA, Tempei TANAKAMARU, Shunichi NABEYA, ...
    2008 年 20 巻 1+2 号 p. 33-36
    発行日: 2008年
    公開日: 2008/12/19
    ジャーナル フリー
    Magnetostrictive properties of Sm-Fe-N and Sm-Fe-C giant magnetostrictive material (GMM) thin film have been systematically investigated in this study. Film samples were prepared by d.c. magnetron sputtering process in Ar-N2 or Ar-CH4 gases atmosphere. Saturated magnetostriction of formed thin films was decreased with increasing of N2 and CH4 partial pressure because of formation of non-magnetic SmN or SmC2 phases. Maximum value of magnetostrictive susceptibility is 34 ppm/kAm-1 was observed in Sm-Fe-C thin film sample with 1.0 vol% CH4 gas partial pressure. Compressive stress of thin film samples was increased due to the increasing of N2 and CH4 gases pressure. The increasing of compressive stress with small N2 and CH4 addition amount into thin film samples may influence the increasing of magnetostrictive susceptibility.
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