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Articles by M. Hirota
Total Records ( 2 ) for M. Hirota
  A. Nishimura , Y. Hayashi , K. Tanaka , M. Hirota , S. Kato , M. Ito , K. Araki and E.J. Hu
  In this study, the environmental load of photovoltaic power generation system (PV) during its life cycle and energy payback time (EPT) are evaluated by LCA scheme. Two hypothetical case studies in Toyohashi, Japan and Gobi dessert in China have been carried out to investigate the influence of installation location and PV type on environmental load and EPT. The environmental load and EPT of a high-concentration photovoltaic power generation system (hcpV) and a multi-crystalline silicon photovoltaic power generation system (mc-Si PV) are studied. The study shows for a PV of 100 MW size, the total impacts of the hcpV installed in Toyohashi is larger than that of the hcpV installed in Gobi desert by 5% without consideration of recycling stage. The EPT of the hcpV assumed to be installed in Gobi desert is shorter than EPT of the hcpV assumed to be installed in Toyohashi by 0.64 year. From these results, the superiority to install PV in Gobi desert is certificated. Comparing with hcpV and mc-Si PV, the ratio of the total impacts of mc-Si PV to that of hcpV is 0.34 without consideration of recycling stage. The EPT of hcpV is longer than EPT of mc-Si PV by 0.27 year. The amount of global solar radiation contributing to the amount of power generation of mc-Si PV is larger than the amount of direct solar radiation contributing to the amount of power generation of hcpV by about 188 kW h/(m2 year) in Gobi desert. Consequently, it appears that using mc-Si PV in Gobi desert is the best option.
  F. Khanom , H. Kayahara , M. Hirota and K. Tadasa
  The superoxide-scavenger and tyrosinase inhibitory active material was extracted by methanol from ginger (Zingiber officinale Roscoe) and was partitioned into hexane, aqueous and ethyl acetate parts. The highly active hexane soluble part was subjected to fractioned by silica gel column chromatography and was obtained in eight fractions. All most all fractions gave a remarkable amount of superoxide-scavenging and tyrosinase inhibitory activities. The highest superoxide-scavenging and tyrosinase activities were found in the fraction five (58.2 and 42.7%, respectively) and its purity was confirmed by thin layer chromatography (TLC). This fraction was amounting as 274.3 mg and characterized by nuclear magnetic resonance (NMR), infrared (IR) and mass spectrometer. The compound was gingerol and its structure was confirmed as 3-decanone, 5-hydroxy-1 (4-hydroxy-3-methoxy phenyl) -3-one on the basis of spectral evidence.
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