Search Results 1-20 of 996

  • Fibrous Adsorbents Capable of Processing Contaminated Water at Fukushima Daiichi NPP  [in Japanese]

    斎藤 恭一

    化学工学 = Chemical engineering of Japan 84(9), 428-431, 2020-09

  • Aboveground biomass and seasonal patterns of aboveground net primary productivity in five bamboo species in northern Laos

    Nakagawa Michiko , Tomita Shinsuke , Hirota Isao , Xayalath Singkone

    … Aims: Accurate estimates of bamboo biomass and net primary productivity (NPP) are required to evaluate the carbon sequestration potential of bamboo forests. … Information on seasonal patterns of NPP and its components will enable the quantification of factors that influence the carbon balance in bamboo forests. … In this study, we quantified the aboveground biomass (AGB) and aboveground NPP of five major bamboo species in northern Laos using monthly data collected over a 12-month period. …

    Journal of Plant Ecology 13(2), 150-156, 2020-04

    IR 

  • Impacts of direct release and river discharge on oceanic 137Cs derived from the Fukushima Dai-ichi Nuclear Power Plant accident

    恩田 裕一 , 青山 道夫 , Daisuke Tsumune , Takaki Tsubono , Kazuhiro Misumi , Yutaka Tateda , Yasushi Toyoda , Yuichi ONDA , Michio AOYAMA

    … A series of accidents at the Fukushima Dai-ichi Nuclear Power Plant (1F NPP) following the Great East Japan Earthquake and tsunami of 11 March 2011 resulted in the release of radioactive materials to the ocean. … The direct release rate of 137Cs after the accident until the end of 2016 was estimated by comparing simulated results with measured 137Cs activities adjacent to the 1F NPP. …

    Journal of environmental radioactivity (214-215), 106173, 2020-04

    IR 

  • EVALUATION OF SEISMIC PERFORMANCE FOR THE COMPLEX STRUCTURE OF PLANAR ARRANGEMENT WITH REINFORCED CONCRETE SHEAR WALLS  [in Japanese]

    TOJO Takaki , TANAKA Kazuki , YAMAMOTO Shoma , TSUNASHIMA Naohiko , SUZUKI Takuya , TAKADA Akinobu , YABUSHITA Naoto

    … <p>Concrete buildings in nuclear power plant (NPP) are often irregularly shaped box frame structures with reinforced concrete (RC) shear walls, according to equipment layout. … Generally, these structures are designed in accordance with the NPP seismic design technical provision. … In this study, the impact of the RC shear walls with irregularity on the seismic performance of NPP buildings is evaluated using a finite element model (FEM). …

    AIJ Journal of Technology and Design (62), 91-96, 2020-02

    J-STAGE  AIJ 

  • Strategy and Experiences of Decommissioning Projects of Nuclear Power Plants in Overseas(4)Overviews of the Representative Projects of NPP Decommissioning in the United Kingdom (UK)  [in Japanese]

    宮坂 靖彦 , 澁谷 進 , 榎戸 裕二

    デコミッショニング技報 = Journal of the RANDEC (62), 47-66, 2020

  • Decommissioning of Nuclear Power Plant:(Differences between Accident Reactor and Normal Reactor)  [in Japanese]

    OKAMOTO Koji

    … <p>Before the Fukushima-Daiichi NPP accident, around 50 nuclear power plants were operating to generate around 20% of Electricity consumption. … The decommissioning activities for these decommissioning NPP may take times and costs. … While, Fukushima-Daiichi NPP decommissioning needs lots of Research and Development. …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), K08201, 2020

    J-STAGE 

  • Controversy on the Safety Examination of the Tokai Nuclear Power Plant : Focusing on the Issue of Major Accidents  [in Japanese]

    横田 陽子

    … This paper examines controversy during the safety examination of the first commercial nuclear power plant (NPP) in Japan, the Tokai Nuclear Power Plant, focusing on the issue of major accidents. … The controversy revolved around four key issues: 1) how to develop NPP technology; …

    Journal of History of Science, JAPAN 59(293), 1-17, 2020

    J-STAGE 

  • Experimental study on the effects of fine bubbles on polydisperse submicron aerosol removal efficiency during pool scrubbing

    ZHANG Xingyong , OKAMOTO Koji , ERKAN Nejdet , SAITO Takumi

    … <p>Radioactive aerosols are strongly diffusive and migratory and thus have presented one of the greatest challenges during the decommissioning of the Fukushima Daiichi Nuclear Power Plant (NPP). … The improved removal efficiency achieved using fine bubbles may provide a new method for suppressing the generation of radioactive aerosols in the decommissioning of the Fukushima Daiichi NPP.</p> …

    Mechanical Engineering Letters 6(0), 19-00655-19-00655, 2020

    J-STAGE 

  • Articulating Risk(s): Economic and Demographic Challenges in A Nuclear Town

    … This article investigates the risks and human insecurities existing in the local community of Omaezaki City, where the Hamaoka nuclear power plant (NPP) is located. … In the wake of the Fukushima nuclear meltdown, the operation at the Hamaoka NPP was suspended and has since remained so, upon a request from the government on 9 May 2011. …

    Journal of Human Security Studies 6(1), 38-65, 2020

    J-STAGE 

  • Roles of mesocortico–limbic system in exercise–induced hypoalgesia  [in Japanese]

    Kami Katsuya , Tajima Fumihiro , Senba Emiko

    … Voluntary exercise (VE) in neuropathic pain (NPP) model mice significantly improved pain behaviors of these mice, and significant positive–correlation was observed between their total running distances and pain thresholds, suggesting that the increase of physical activity enhances analgesic levels. …

    PAIN RESEARCH 35(2), 80-91, 2020

    J-STAGE  Ichushi Web 

  • Analysis in temporal changes of Cs-137 concentration based on regional monitoring data in Fukushima Prefecture  [in Japanese]

    Mori Keisuke , Kato Hiroaki , Yamaguchi Toshiro , Onda Yuichi

    <p>福島原子力発電所の事故により大量の放射性セシウムが大気中に放出され、福島県を中心とした広範囲が汚染された。その結果、福島県の基幹産業である林業や農業等に大きく影響を与えている。本研究の目的は、林野庁や福島県の森林計画課が測定している福島県内多地点での放射性セシウムのデータを用いて広域的に解析することで、特定の地点だけではなく全体として放射性セシウムが樹種やそのほかの要因によってど …

    The Japanese Forest Society Congress 131(0), 521, 2020

    J-STAGE 

  • Annual variation in Net Primary Production(NPP) of a subtropical evergreen broad-leaved forest in Okinawa island, Japan  [in Japanese]

    Sakamoto Koshiro , Matsumoto Kazuho , Taniguchi Shingo

    … 本研究ではやんばるの森林において、植物が生産する有機物量(純一次生産量,NPP)を積み上げ法に基づいて評価した。 … NPPは一定期間における植物の成長量と枯死脱落量、被食量の和として求められる。 … その結果、NPPは315 g C m<sup>-2</sup> …

    The Japanese Forest Society Congress 131(0), 492, 2020

    J-STAGE 

  • Estimation of fine root dynamics focused on root diameter size class in mangrove forest in Okinawa  [in Japanese]

    Kihara Yumi , Osawa Akira , Dannoura Masako

    … さらに、調査期間中の細根生産量からメヒルギ林における細根純一次生産量(NPP<sub>fr</sub>)を求めた。 … また、イングロースコア法及び連続コア法により推定したNPP<sub>fr</sub>は、それぞれ1.5 Mg C ha<sup>-1</sup> …

    The Japanese Forest Society Congress 131(0), 431, 2020

    J-STAGE 

  • Factors controlling heterogeneity of Fukushima accident-derived radiocesium at forest floor  [in Japanese]

    Kato Hiroaki , Tomoki Shinozuka , Iida Hikaru , Akaiwa Satoru , Mori Keisuke , Onda Yuichi

    <p>本研究では、福島県内のスギ林及び落葉広葉樹林を調査対象林に選定し、樹冠通過雨、樹幹流及び落葉落枝を定期的に採取し、それらに含まれる放射性セシウム濃度をゲルマニウムガンマ線検出器を用いて定量した。山木屋地区の調査林分では2011年6月から観測を開始し、一方の浪江町では2018年6月から開始した。それらの観測データに基づいて、初期遮断と主に雨水に伴う樹冠から林床への移行過程が林内の放 …

    The Japanese Forest Society Congress 131(0), 326, 2020

    J-STAGE 

  • Changes in xylem immobilization of radiocesium by forest floor treatment  [in Japanese]

    mase Kosuke , Kobayashi Tatsuaki , Takahashi terumasa , Hirano Takamasa , Saito Sho

    <p>里山林における樹木の放射性セシウムの不動化量を明らかにするため,福島県川俣町のマツ-広葉樹混交林に試験区を設置し、2016年と2019年に成長錐を用いて材試料を採取した。対照区をA区とし、処理区は熊手による林床のリター除去を行った後,表面汚染密度が3Bq/cm<sup>2</sup>以下となるまでA0層全体を削り取ったB区と、L層とF層の一部を除去したC区 …

    The Japanese Forest Society Congress 131(0), 324, 2020

    J-STAGE 

  • Availability analysis of 4-20mA pressure trasmitters under harsh environmental conditions using the discriminant classifier

    RASHEED Irsa , LI Liu , LIN Guo , SHILIANG Zhou

    … This fact highlights the significance of instrument availability during all possible environmental conditions in a Nuclear Power Plant (NPP). … Along with several instruments used in an NPP, transmitters have gained momentous significance in the instrumentation loop as they provide critical information about the plant status. …

    Mechanical Engineering Journal 7(3), 19-00553-19-00553, 2020

    J-STAGE 

  • EVALUATION OF THE EFFECTS OF DIFFERENCES IN BUILDING MODELS ON THE SEISMIC RESPONSE OF A NUCLEAR POWER PLANT STRUCTURE

    CHOI Byunghyun , NISHIDA Akemi , MURAMATSU Ken , TAKADA Tsuyoshi

    本研究では、原子力施設の確率論的地震リスク評価の信頼性向上に資するため、原子炉建屋の地震応答解析結果におけるモデル化手法の違いによる影響を評価し、フラジリティ評価における認識論的不確実さを定量化することを目的としている。入力地震動として、偶然的不確実さを考慮するため、ハザード適合地震波を用いた。現実的な応答を得るため、原子炉建屋の3次元詳細モデルによる地震応答解析を実施し、建屋の壁および床の最大加 …

    Journal of Japan Association for Earthquake Engineering 20(2), 2_1-2_16, 2020

    IR  J-STAGE 

  • Influence of Power Generation Mix on Photochemical Ozone Concentration in Osaka Area  [in Japanese]

    YASUDA Ryusuke , YOSHIDA Atsumasa

    … After a big earthquake and subsequent accidents at Fukushima Dai-ichi Nuclear Power Plant (NPP) in March 2011, the NPPs in Japan have been shutdown, and the power shortage has been compensated by Thermal Power Plants (TPPs). …

    Journal of the Japanese Society for Experimental Mechanics 19(4), 317-326, 2020

    J-STAGE 

  • FASTER UPLIFT ANALYSIS USING INVERSE OF PARTIAL TANGENT STIFFNESS MATRIX  [in Japanese]

    SUZUKI Takuya

    … <p> In the seismic design of nuclear power plant (NPP) buildings, the evaluation of basement uplift is an important factor. … However, a lot of calculation time is required for these analyses with large finite element (FE) models, which then becomes a problem.</p><p> This study proposes a novel method to accelerate the uplift analysis for NPP buildings. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (763), 1215-1222, 2019-09

    J-STAGE  AIJ 

  • A Current Harmonic Minimum PWM for Three-Level Converters Aiming at the Low-Frequency Fluctuation Minimum of Neutral-Point Potential

    Guan Bo , Doki Shinji

    … When the selected harmonic elimination pulsewidth modulation (SHEPWM) is adopted to three-level neutral-point-clamped converters to reduce the switching frequency, the neutral-point potential (NPP) problem becomes more severe compared with other modulations. … It is because there is no degree of freedom for SHEPWM to control the NPP. … Since it is harsh to solve the angles online, we cannot change the angles to control the NPP. …

    IEEE Transactions on Industrial Electronics 66(5), 3380-3390, 2019-05

    IR 

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