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Development of the Operating Circuit for a LED Lamp Based on the Cockcroft-Walton Circuit

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Journal of Energy and Power Engineering 2012年第12期6卷 1957-1964页

作者： tomohiro yamaguchi Yuta Nakamura Cixin Wei yoshio watanabe Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan

The operating circuits for LED （light emitting diode） lamp composed of diodes and DC capacitors only are proposed. The proposed circuit is based on a double-voltage rectifier circuit and a Cockcroft-Walton circuit. The circuit can operate LED without flicker, and is free from switching noise since high frequency switching circuit is not used. To replace an AC capacitor by a DC capacitor for the ballast, a diode is connected across the capacitor in parallel, and the operating voltage of LED unit is kept at the value greater than the peak voltage of the input power source. The circuit realizes high efficiency and high input power factor compared with the operating circuits on the market. Cockcroft-Walton-type circuit can operate many LED devices in series connection. Series connection is preferable for fabricating LED unit of a constant voltage characteristic. Moreover, fairly flat waveform of LED operating current is realized by Cockcrofl-Walton-type circuit, even though capacitor ballast is used.

关键词： LED lamp light emitting diode Cockcroft-Walton circuit double-voltage rectifier circuit DC capacitor DC convertor.

Analysis for Effects of Temperature Rise of PV Modules upon Driving Distance of Vehicle Integrated Photovoltaic Electric Vehicles

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Energy and Power Engineering 2024年第4期16卷 131-150页

作者： Masafumi yamaguchi Yasuyuki Ota Taizo Masuda Christian Thiel Anastasios Tsakalidis Arnulf Jaeger-Waldau Kenji Araki Kensuke Nishioka Tatsuya Takamoto Takashi Nakado Kazumi Yamada Tsutomu Tanimoto Yosuke Tomita Yusuke Zushi Kenichi Okumura Takashi Mabuchi Akinori Satou Kyotaro Nakamura Ryo Ozaki Nobuaki Kojima yoshio Ohshita Toyota Technological Institute Nagoya Japan Faculty of Engineering Miyazaki University Miyazaki Japan Toyota Motor Corporation Susono Japan European Commission— Joint Research Centre Ispra Italy Sharp Corporation Nara Japan Toyota Motor Corporation Toyota Japan Nissan Motor Corporation Yokosuka Japan

The development of vehicle integrated photovoltaics-powered electric vehicles (VIPV-EV) significantly reduces CO2 emissions from the transport sector to realize a decarbonized society. Although long-distance driving of VIPV-EV without electricity charging is expected in sunny regions, driving distance of VIPV-EV is affected by climate conditions such as solar irradiation and temperature rise of PV modules. In this paper, detailed analytical results for effects of climate conditions such as solar irradiation and temperature rise of PV modules upon driving distance of the VIPV-EV were presented by using test data for Toyota Prius and Nissan Van demonstration cars installed with high-efficiency InGaP/GaAs/InGaAs 3-junction solar cell modules with a module efficiency of more than 30%. The temperature rise of some PV modules studied in this study was shown to be expressed by some coefficients related to solar irradiation, wind speed and radiative cooling. The potential of VIPV-EV to be deployed in 10 major cities was also analyzed. Although sunshine cities such as Phoenix show the high reduction ratio of driving range with 17% due to temperature rise of VIPV modules, populous cities such as Tokyo show low reduction ratio of 9%. It was also shown in this paper that the difference between the driving distance of VIPV-EV driving in the morning and the afternoon is due to PV modules’ radiative cooling. In addition, the importance of heat dissipation of PV modules and the development of high-efficiency PV modules with better temperature coefficients was suggested in order to expand driving range of VIPV-EV. The effects of air-conditioner usage and partial shading in addition to the effects of temperature rise of VIPV modules were suggested as the other power losses of VIPV-EV.

关键词： Vehicle Integrated Photovoltaics (VIPV) VIPV-Powered Electric Vehicles Driving Distance PV Modules Solar Irradiation Temperature Rise Radiative Cooling

Investigation of Moving Striation Characteristics and Formation Mechanism of Striation Shapes in a Fluorescent Lamp

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材料科学与工程（中英文A版） 2011年第6期1卷 753-758页

作者： yoshio watanabe Masato Kawagoe tomohiro Yamaguch Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan

The characteristics of the moving striation in a fluorescent lamp are investigated as a function of operating frequency, discharge current, gas species and so on. The moving striation is formed in Ar gas discharge as well as in Ar-Hg mixture gas. The interval between each ball of striation is nearly constant against operating frequency, discharge current and wall temperature of the tube. The moving manner of the striation is mainly governed by operating frequency and the stationary striation is observed at around 2 kHz. When DC bias is added to AC discharge current, the movement of striation is strongly influenced by the DC bias. Comet-like shape is observed and it moves from anode to cathode direction with velocity of 80 m/s in the case of DC operation. In the case of AC operation, a comet-like striation found in DC operation only exists and its moving direction is always from anode to cathode during AC half cycle period. Three types of the moving striation shape observed by eyes are formed by the relationship of the vibration width of the comet to the distance between adjacent striation balls.

关键词：荧光灯条纹移动形状特征和机制工作频率直流操作

Removal of competitive native species combined with tree planting can accelerate the initial afforestation process: an experiment in an old field in Japan invaded by dwarf bamboo and kudzu

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Journal of Forestry Research 2015年第3期26卷 581-588页

作者： Yoshinori Tokuoka Kentaro Ohigashi Koji watanabe Hiroshi yamaguchi Takahiro Ara Nobukazu Nakagoshi Biodiversity Division National Institute for Agro-Environmental Sciences 3-1-3 Kannondai TsukubaIbaraki 305-8604 Japan Ecosystem Informatics Division National Institute for Agro-Environmental Sciences 3-1-3 Kannondai TsukubaIbaraki 305-8604 Japan Experimental Farm Management Division National Institute for Agro-Environmental Sciences 3-1-3 KannondaiTsukuba Ibaraki 305-8604 Japan Graduate School for International Development and Cooperation Hiroshima University 1-5-1 KagamiyamaHigashi-Hiroshima 739-8529 Japan

Restoring natural forests after field abandon- ment is a land management objective that fosters the re- covery of forest biodiversity. We performed seeding and transplanting of native tree species 40 years after the abandonment of an arable field that became dominated by a dwarf bamboo （Pleioblastus chino （Franch. et Sav.） Makino） and by kudzu （Pueraria lobata （Willd.） Ohwi）. By permutation tests, the removal of competing vegetation （gap creation） significantly increased the survival of three seeded species of Fagaceae and of eight transplanted spe- cies. In contrast, intact vegetation prevented most indi- viduals of all species from surviving for 1 year after planting. The lack of natural recruitment of Fagaceae in the nonseeded subplots indicated that seed limitation was a cause of the slow afforestation. Although litter accumula- tion in gaps at the time of seeding slightly increased sur- vival for late-germinating Quercus myrsinifolia Blume andCastanopsis sieboldii （Makino） Hatus. ex T. Yamaz. et Mashiba, the effect was not consistent among plots and was not statistically significant. Our results suggest that for successful afforestation using native trees in abandoned fields, it will be necessary to remove competitive native species to avoid severe limitations on microsite availability and that simultaneous tree establishment by seeding or transplanting should be implemented to accelerate the establishment of native tree species.

关键词： Farmland abandonment - Micrositelimitation Pleioblastus chino Pueraria lobata Treeseedling

A dwarf bamboo(Pleioblastus chino) and winter browsing by Japanese hare(Lepus brachyurus) combine to limit establishment of transplanted native tree seedlings in an abandoned agricultural field

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Journal of Forestry Research 2016年第6期27卷 1287-1294页

作者： Yoshinori Tokuoka Kentaro Ohigashi Koji watanabe Hiroshi yamaguchi Takahiro Ara Nobukazu Nakagoshi Biodiversity Division National Institute for Agro-Environmental Sciences (NIAES) Ecosystem Informatics Division NIAES Experimental Farm Management Division NIAES Graduate School for International Development and Cooperation Hiroshima University

Natural forest recovery on abandoned farmland is hindered by a variety of factors and active restoration plays an important role when quick afforestation is desired. We investigated seedling survival of four transplanted native tree species （Quercus myrsinifolia, Quercus serrata, Aphananthe aspera, and Rhus sylvestris） by experimentally manipulating the vegetation cover, which was mainly dominated by dwarf bamboo （Pleioblastus chino）, and herbivore access to the planting sites on farmland that had been abandoned for 15 years at the start of the study. Few transplanted seedlings of any species survived under intact vegetation cover, irrespective of herbivore presence. In gaps in the vegetation cover, winter browsing by Japanese hare （Lepus brachyurus） damaged all species. However, lower browsing frequency and higher resprouting ability after grazing of the seedlings enabled both Quercus species to survive better than the other species. These results indicate that dwarf bamboo and the hare jointly limit the establishment of native trees in old fields. If active afforestation by transplanting seedlings at sites dominated by dwarf bamboo is planned, a combination of vegetation removal, selection of suitable species, and temporary seedling protection will be most effective.

关键词： Farmland abandonment Microsite limitation Monodominant dwarf bamboo Resprouting Seedling herbivory

Lysophosphatidic acid transactivates both c-Met and epidermal growth factor receptor, and induces cyclooxygenase-2 expression in human colon cancer LoVo cells

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World Journal of Gastroenterology 2005年第36期11卷 5638-5643页

作者： Joji Kitayama Hironori yamaguchi Hiroharu Yamashita Ken Mori Toshiaki watanabe Hirokazu Nagawa Department of Surgical Oncology University of Tokyo Graduate School of Medicine Tokyo 113-8655 Japan

AIM： To examine whether lysophosphatidic acid （LPA） induces phosphorylation of c-Met and epidermal growth factor receptor （EGFR）, both of which have been proposed as prognostic markers of colorectal cancer, and whether LPA induces cyclooxygenase-2 （COX-2） expression in human colon cancer cells. METHODS： Using a human colon cancer cell line, LoVo cells, we performed immunoprecipitation analysis, followed by Western blot analysis. We also examined whether LPA induced COX-2 expression, by Western blot analysis. RESULTS： Immunoprecipitation analysis revealed that 10 μmol/L LPA induced tyrosine phosphorylation of c-Met and EGFR in LoVo cells within a few minutes. We found that c-Met tyrosine phosphorylation induced by LPA was not attenuated by pertussis toxin or a matrix metalloproteinase inhibitor, in marked contrast to the results for EGFR. In addition, 0.2-40 IJmol/L LPA induced COX-2 expression in a dose-dependent manner. CONCLUSION： Our results suggest that LPA acts upstream of various receptor tyrosine kinases （RTKs） and COX-2, and thus may act as a potent stimulator of colorectal cancer. 2005 The WJG Press and Elsevier Inc. All rights reserved.

关键词： Lysophosphatidic acid c-Met EGFR Transactivation Cyclooxygenase-2 Colon cancer

Herbal medicine Ninjinyoeito ameliorates ribavirin-induced anemia in chronic hepatitis C: A randomized controlled trial

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World Journal of Gastroenterology 2005年第26期11卷 4013-4017页

作者： Yoshiharu Motoo Hisatsugu Mouri Koushiro Ohtsubo Yasushi yamaguchi Hiroyuki watanabe Norio Sawabu Department of Internal Medicine and Medical Oncology Cancer Research Institute Kanazawa University Kanazawa Japan

AIM:Ribavirin (RBV) shows a strong antiviral effect on hepatitis C virus when used in combination with interferon. However, RBV-induced anemia is a major problem in this therapy. It would be of great clinical importance to ameliorate the anemia without reducing the RBV dose. We report here that, Ninjinyoeito (NYT), a herbal medicine can reduce the RBV-induced anemia. METHODS: Twenty-three patients with chronic hepatitis C were treated with interferon alpha 2b plus RBV with (NYT group) or without (control group) NYT by a randomized selection. Eighteen patients completed the treatment schedule, and hemato-biochemical and virological effects were evaluated. RESULTS: There was no significant difference in biochemical and virological responses between the two groups. However, anemia was significantly reduced in the NYT group compared with the control group. The maximal decrease of Hb in the NYT group (2.59±1.10 g/dL) was significantly (P= 0.026) smaller than that in the control group (3.71±0.97 g/dL). There was no significant difference in serum glutathione peroxidase activity, serum RBV concentration, and Thl/Th2 balance between the two groups. There was no specific adverse effect in NYT administration. CONCLUSION: These results suggest that NYT could be used as a supportive remedy to reduce the RBV-induced anemia in the treatment of chronic hepatitis C.

关键词： Chronic hepatitis C Ribavirin Interferon Herbal medicine Anemia

Novel serum tumor marker, RCASl, in pancreatic diseases

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World Journal of Gastroenterology 2005年第33期11卷 5199-5202页

作者： Koji yamaguchi Munechika Enjoji Manabu Nakashima Makoto Nakamuta Takashi watanabe Masao Tanaka Department of Surgery and Oncology Graduate School of Medicine Kyushu University Japan Medicine Bioregulatory Sciences Graduate School of Medical Sciences Kyushu University Japan Department of Molecular Immunology Medical Institute of Bioregulation Faculty of MedicineKyushu UniversityJapan Department of Molecular Immunology Medical Institute of Bioregulation Faculty of Medicine Kyushu University Japan

AIM： As tumor markers for pancreatic carcinoma, carcinoembryonic antigen （CEA） and carbohydrate antigen （CA） 19-9 have been used, but the sensitivity and specificity are not enough for the diagnosis of pancreatic carcinoma. METHODS： A novel serum tumor marker, RCAS1, was compared with two conventional serum tumor markers, CEA （highly specific for pancreatic cancer） and CA 19-9 （highly sensitive for pancreatic cancer）, in 48 patients with pancreatic exocrine tumors. RESULTS： When the diagnosis of benign or malignant conditions was examined by one tumor marker, the sensitivity of RCAS1 alone （55%） was higher than that of CEA alone （27%） and the specificity of RCAS1 alone （92%） was greater than that of CA19-9 alone （78%）. When examined by a combination of two markers, the sensitivity of a combination of RCAS1 and CA19-9 （95%） was superior to those of CA19-9 alone （78%）, RCAS1 alone （55%, P = 0.002）, CEA alone （27%）（P〈0.001）, RCAS1 and CEA （59%） and CA19-9 and CEA （82%）. CONCLUSION： These results suggest that the combination of RCAS1 and CA19-9 is highly sensitive for pancreatic carcinoma.

关键词： RCASi CEA CA19-9 Pancreatic diseases

Interactions among dwarf bamboo, litter and consumption by small vertebrates place multiple constraints on the establishment of native tree seedlings in a Japanese agricultural landscape

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Journal of Plant Ecology 2019年第2期12卷 292-305页

作者： Yoshinori Tokuoka Kentaro Ohigashi Koji watanabe Hiroshi yamaguchi Takahiro Ara Nobukazu Nakagoshi Division of Biodiversity Institute for Agro-Environmental SciencesNational Agriculture and Food Research Organization3-1-3KannondaiTsukuba-shiIbaraki 305-8604Japan Division of Informatics and Inventory Institute for Agro-Environmental SciencesNational Agriculture and Food Research Organization3-1-3KannondaiTsukuba-shiIbaraki 305-8604Japan Department of Planning and Coordination Tsukuba Technical Support CenterNational Agriculture and Food Research Organization3-1-3KannondaiTsukuba-shiIbaraki 305-8604Japan Graduate School for International Development and Cooperation Hiroshima University1-5-1 KagamiyamaHigashi-Hiroshima 739-8529Japan

Aims Faunal assemblage alterations due to anthropogenic impacts have changed herbivore-vegetation relationships in various ecosystems,but the influences of small vertebrates on revegetation processes remain *** a peri-urban agricultural landscape in eastern Japan that lacks large ungulates but supports small generalist herbivores,fewer native seedlings have become established in thickets dominated by native dwarf bamboo,Pleioblastus chino(*** Sav.)*** mechanisms limiting tree seedling establishment are *** aim here was to evaluate the influence of interactions among the dwarf bamboo,its litter cover and small vertebrate herbivores on the micro-site conditions governing the establishment of native tree seedlings from different successional stages in an old field in temperate *** First,seedling emergence and survival of seeded Pinus densiflora Siebold et Zucc.,Celtis sinensis Pers.,Aphananthe aspera(Thunb.)Planch.,Quercus serrata Murray,Quercus myrsinifolia Blume and Castanopsis sieboldii(Makino)*** *** Mashiba were observed in a factorial design that accounted for the presence or absence of dwarf bamboo and its litter cover,as well as the exclu-sion or access of small vertebrate fauna,in 2009 and *** identify small vertebrate herbivores that reduced the emergence or survival of tree seedlings in the first experiment,reseeding experi-ments using ***,***,*** and *** were conducted by video trapping in 2011 and video and still-cam-era trapping in *** Findings The abiotic conditions under the dwarf bamboo were lethal to early-to mid-successional ***,***,*** and *** but led to better survival-although spindly growth-of late-succes-sional *** and *** main consumers and the plants they found palatable differed between the bamboo thickets and the intervening *** by mice appeared to have severely limited the emergence of

关键词： bamboo cover farmland abandonment microsite limitation selective herbivory Pleioblastus chino