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Midori YAsuda,Michio Kondo,Tamiyoshi Sonda,Kazumi Takedomi,Syouhei Eguchi,Ayumi Eguchi 한국차학회 2003 한국차학회지 Vol.9 No.3
The effects of manufacturing methods of tea on the chemical components and the physiological function of tea were studied. Tea samples were manufactured by three different methods with the same fresh tea leaves which were plucked on the same date at the same place. The tea manufacturing methods were ① the steamed method. ② pan fired method of the conventional style and ③ the new pan fired method of Eguchi style with high pressure and airtight pan. The difference of manufacturing methods was hardly affected on contents of minerals, amino acids and caffeine in infusions. However, catechins in tea manufacturing by pan fired method of Eguchi style were more than that in teas manufacturing by other methods. As to the antioxidative activity, the tea manufacturing by pan fired method of Eguchi style was also the highest of all others. The tea tissues at the cross section were observed by a scanning electron microscope. As a result, the destruction of tea tissue was confirmed for the teas manufacturing by pan fired method. These results would have been due to the complete inactivation of polyphenol oxidase and the destruction of tea tissues by the manufacturing process at high temperature with airtight pan.
Development of a rapidly stabilized protocrystalline silicon multilayer solar cell
Myong, Seung Yeop,Kwon, Seong Won,Kondo, Michio,Konagai, Makoto,Lim, Koeng Su Institute of Physics 2006 Semiconductor science and technology Vol.21 No.2
<P>We develop a rapidly stabilized pin-type thin film solar cell with a low degradation by combining a p-type hydrogenated amorphous silicon-carbide (p-a-SiC:H) double layer structure and an alternately hydrogen-diluted protocrystalline silicon (pc-Si:H) multilayer absorber. The p-a-SiC:H double layer structure increases overall initial parameters by reducing recombination at the p/i interface. After 12 h standard light irradiation, we achieve a stabilized efficiency of 9.0% without using any back reflector. Nano-sized silicon grains embedded in regularly arranged highly hydrogen-diluted sublayers of the pc-Si:H multilayer suppress the photocreation of dangling bonds in a amorphous silicon matrix acting as radiative recombination centres of photoexcited carriers.</P>