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Masahiro Nakao,Kenji Yasui,Izuo Hirota,Toshiaki Iwai,Hideki Omori,Hyun Woo Lee,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents the soft switching duty cycle controlled AC-AC direct high frequency cycloconversion circuit for consumer induction heated cooker and steamer, which has unity power factor and sinewave line current shaping functions. The proposed commercial utility frequency AC (LFAC) to high frequency AC (HFAC) cycloconverter can be composed of minimum circuit components for resonance, filter and diodes, which is possible to implement effective miniaturization, low cost, reliability, high efficiency,<br/> downsizing because of the non-electrolytic capacitor at zero<br/> voltage soft switching commutation scheme. In addition, this paper describes the operating principle and its unique features of LFAC-HFAC cycloconverter circuit. Finally its power regulation characteristics in HFAC side in addition to utility AC side sinewave current quality and unity PFC are evaluated and discussed from a simulation point of view. Its practical effectiveness of this direct frequency cycloconverter is proven for consumer induction heated appliances in home and business usages.
Nakaoka, Yoshikazu,Nishida, Keigo,Narimatsu, Masahiro,Kamiya, Atsunori,Minami, Takashi,Sawa, Hirofumi,Okawa, Katsuya,Fujio, Yasushi,Koyama, Tatsuya,Maeda, Makiko,Sone, Manami,Yamasaki, Satoru,Arai, Yu American Society for Clinical Investigation 2007 The Journal of clinical investigation Vol.117 No.7
Kawai, Hiroshi,Kamiya, Mitsunobu,Komatsu, Teruhisa,Nakaoka, Masahiro,Yamamoto, Tomoko,Marine Life Research Group of Takeno, Marine Life Research Group of Takeno The Korean Society of Phycology 2007 ALGAE Vol.22 No.1
In order to understand the impact of the heavy-oil pollution by the 1997 Nakhodka oil spill on the intertidal macroalgal vegetation, we have been monitoring succession in the intertidal flora since 1997 at Oh-ura, Takno, and Imago-Ura Cove, Kasumi in Hyogo Prefecture, northwestern coast of Honshu, Japan. We employed two different monitoring methods: 1) The percent cover of macro-algae (seaweeds) in 1 x 1 m quadrats along 450 m intertidal transects parallel to the shoreline were assessed and recorded by photographic imaging until 2002, and for 30-40 m transects of the most heavily polluted areas in 2004 and 2006; 2) The percent cover of macro-algae in 0.5 x 0.5 m quadrats along a transect line perpendicular to the shore were recorded and all macrophytes within the quadrat were completely removed to record the wet weight of each taxon (1997-2006). Based on the monitoring data, we conclude that the high intertidal zone at Imago-ura, where a large part of the stranded oil accumulated, suffered the heaviest damage and experienced the slowest recovery. In addition, although the original status of macroalgal vegetation before the impact was not well-documented, it appeared that recovery from the damage caused by the oil pollution required four to five years.
Hiroshi Kawai,the Marine Life Research Group of Takeno,Tomoko Yamamoto,Masahiro Nakaoka,Teruhisa Komatsu,Mitsunobu Kamiya 한국조류학회I 2007 ALGAE Vol.22 No.1
In order to understand the impact of the heavy-oil pollution by the 1997 Nakhodka oil spill on the intertidal macroalgal vegetation, we have been monitoring succession in the intertidal flora since 1997 at Oh-ura, Takno, and Imago-Ura Cove, Kasumi in Hyogo Prefecture, northwestern coast of Honshu, Japan. We employed two different monitoring methods: 1) The percent cover of macro-algae (seaweeds) in 1 x 1 m quadrats along 450 m intertidal transects parallel to the shoreline were assessed and recorded by photographic imaging until 2002, and for 30-40 m transects of the most heavily polluted areas in 2004 and 2006; 2) The percent cover of macro-algae in 0.5 x 0.5 m quadrats along a transect line perpendicular to the shore were recorded and all macrophytes within the quadrat were completely removed to record the wet weight of each taxon (1997-2006). Based on the monitoring data, we conclude that the high intertidal zone at Imago-ura, where a large part of the stranded oil accumulated, suffered the heaviest damage and experienced the slowest recovery. In addition, although the original status of macroalgal vegetation before the impact was not well-documented, it appeared that recovery from the damage caused by the oil pollution required four to five years.