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Materials Safety for High-Pressure Hydrogen Storage for Fuel Cell Vehicles
Toshio Ogata,Kiyoshi Yokogawa 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Current situation of fuel cell vehicles (FCVs) and their infrastructure is described. High-pressure hydrogen storage at 70 MPa is developed for FCVs, thus the drafts of the standard for the compressed hydrogen storage system on board has been proposed by SAE and discussed worldwide. The high-pressure equipments for hydrogen stations and the pipelines of the infrastructure of FCVs are controlled by the governmental rule, and then ASME has been discussing and/or has proposed the codes for the hydrogen stations and the pipelines. The materials testing equipments in high-pressure hydrogen to evaluate hydrogen embrittlement (HE) in gaseous hydrogen (hydrogen gas embrittlement (HGE)) in the world are introduced. HGE behaviors of the metals are classified into four categories with HGE characteristics in the AIST HGE data. HE behavior in nano-scale is described by nano-indentation and analyzed by the theoretical calculation. The materials safety, in particular for HGE, is essentially important for the standards or codes for public safety.
Improvement of Slow Wave Sleep Continuity by Mattress with Better Body Pressure Dispersal
Momoko Kayaba,Hitomi Ogata,Insung Park,Asuka Ishihara,Fusae Kawana,Toshio Kokubo,Shoji Fukusumi,Michiko Hayashi,Kumpei Tokuyama,Masashi Yanagisawa,Makoto Satoh 대한수면학회 2019 sleep medicine research Vol.10 No.2
Background and Objective This study evaluated the effects of a mattress with better body pressure dispersal in comparison to a control mattress on sleep quality. Methods In this randomized crossover study, 10 healthy young men slept in an experimental sleep room on either a functional mattress made from polyurethane, with a special four-layer three-dimensional structure, or a control mattress made from solid polyester wadding, which is a mattress commercially available in Japan. Polysomnography recordings were used to characterize sleep architecture, and the length of slow wave sleep (SWS) episodes and delta power density were calculated from the electroencephalography data and subjective sleep quality was evaluated by questionnaire they answered after waking. Results There were no significant differences in sleep latency, the total duration of each sleep stages, total sleep time, or sleep efficiency. Although the difference was subtle, delta power density significantly increased with the functional mattress. There was no difference in the total duration of SWS, but there were significantly fewer SWS episodes with the functional mattress (10.3 ± 1.8) than with the control mattress (16.9 ± 1.2) and longer SWS episode duration (10.9 ± 1.7 min) with the functional mattress than with the control mattress (5.6 ± 0.5 min). Conclusions It was suggested that the functional mattress lengthened SWS episode duration, and its fragmentation was effective in evaluating the sleep quality of healthy young individuals.