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Numerical modeling for the coupled thermo-mechanical processes and spalling phenomena in sp Pillar Stability Experiment (APSE)

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第1期5卷 58-72页

作者： t.Koyama M.Chijimatsu H.Shimizu S.Nakama t.fujita A.Kobayashi Y.Ohnishi Department of Urban Management Kyoto University Hazama Corporation Institute of Fluid Science Tohoku University Japan Atomic Energy Agency (JAEA) Faculty of Environmental and Urban Engineering Kansai University Kyoto University

In this paper, the coupled thermo-mechanical （tM） processes in the AEspoe Pillar Stability Experiment （APSE） carried out by the Swedish Nuclear Fuel and Waste Management Company （SKB） were simulated using both continuum and discontinuum based numerical methods. two-dimensional （2D） and three- dimensional （3D） finite element method （FEM） and 2D distinct element method （DEM） with particles were used. the main objective for the large scale in situ experiment is to investigate the yielding strength of crystalline rock and the formation of the excavation disturbed/damaged zone （EDZ） during excavation of two boreholes, pressurizing of one of the boreholes and heating. For the DEM simulations, the heat flow algorithm was newly introduced into the original code. the calculated stress, displacement and temperature distributions were compared with the ones obtained from in situ measurements and FEM simulations. A parametric study for initial microcracks was also performed to reproduce the spalling phenomena observed in the APSE.

关键词： Coupled thermo-mechanical (tM)processesAspoe Pillar Stability Experiment (APSE)Excavation disturbed/damaged zone (EDZ)Finite element method (FEM)Distinct element method (DEM)

Jt—60U全非感应电流驱动系统下具有大自举电流份额的准稳态高约束反剪切等离子体

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国外核聚变 2002年第3期 32-36页

作者： t.fujita 晓风

在Jt－60U托卡马克上首次获得了具有大自举电流份额（约80％）的准稳态反剪切等离子体。反剪切区的收缩受到内输运垒（ItB）层峰化的自举电流的抑制，并且ItBs在大半径处得以维持，它们与H模边缘坪顶结合，结果导致了高约束或2.2或H模... 详细信息

在Jt－60U托卡马克上首次获得了具有大自举电流份额（约80％）的准稳态反剪切等离子体。反剪切区的收缩受到内输运垒（ItB）层峰化的自举电流的抑制，并且ItBs在大半径处得以维持，它们与H模边缘坪顶结合，结果导致了高约束或2.2或H模定标持续了6倍能量约束时间或2.7s。另外，实现了自举电流和束驱动电流的全非感应电流驱动。

关键词：电流份额 Jt-60U 自举电流准稳态反剪切等离子体全非感应电流驱动托卡马克反应堆

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日本致冷技术的动态

真空与低温 1984年第2期 69-73页

作者： t.fujita 洪国同

日本20K 以下的低温致冷研究工作是随着低温物理学的研究在东京大学开始的。那时,科研人员除了已经积累了一些基本的物理数据外,还努力试制了一台氦液化装置。可是,日本的第一台氦液化器是从国外进口的 ADL 型柯林斯氦液化器。1952年,... 详细信息

日本20K 以下的低温致冷研究工作是随着低温物理学的研究在东京大学开始的。那时,科研人员除了已经积累了一些基本的物理数据外,还努力试制了一台氦液化装置。可是,日本的第一台氦液化器是从国外进口的 ADL 型柯林斯氦液化器。1952年,安装在东京大学。在

关键词：超导磁悬浮列车致冷机克劳德制冷机制冷致冷斯特林循环超导器件超导磁体日本

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块根和块茎类植物作为养猪能量饲料的研究

今日畜牧兽医 2010年第8期26卷 21-23,35页

作者： t.fujita 阚致秀

玉米由于它的低纤维含量和高的淀粉消化率使得它含有的能量很高，因此通常在对其他动物能量饲料进行比较时被作为标准.然而，块根、块茎、香蕉、大蕉等农作物同样是丰富的碳水化合物的来源，只所以它们成为热带和亚热带人们饮食的一个... 详细信息

玉米由于它的低纤维含量和高的淀粉消化率使得它含有的能量很高，因此通常在对其他动物能量饲料进行比较时被作为标准.然而，块根、块茎、香蕉、大蕉等农作物同样是丰富的碳水化合物的来源，只所以它们成为热带和亚热带人们饮食的一个基本组成部分，是因为这些作物能够适应广泛的气候条件并且在贫瘠或贫瘠边缘的土地均能生长，它们的产量是相对稳定的，其意义是它们巩固了当地农业生产体系。

关键词：能量饲料块根养猪植物茎类淀粉消化率碳水化合物纤维含量

Negative Parity States in ^(39)Cl Configured by Crossing Major Shell Orbits

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Chinese Physics Letters 2019年第6期36卷 17-20页

作者： Long-Chun tao Cen-Xi Yuan Jian-Ling Lou Xiao-Fei Yan Yan-Lin Ye School of Physics and State Key Laboratory of Nuclear Physics and technology Peking University RIKEN Nishina Center Sino-French Institute of Nuclear Engineering and technology Sun Yat-Sen University Department of Physics University of Tsukuba Department of Physics Kyungpook National University Department of Physics Osaka University Department of Physics Tokyo Institute of Technology Department of Advanced Sciences Hosei University Department of Physics Meiji University

traditional "magic numbers" were once regarded as immutable throughout the nuclear chart. However, unexpected changes were found for unstable nuclei around N = 20. With both proton and neutron numbers around the magic number of 20, the neutron-rich ^(39)Cl isotope provides a good test case for the study of the quantumstate evolution across the major shell. In the present work, the negative parity states in ^(39)Cl are investigated through the β decay spectroscopy of 39 S. Newly observed γ transitions together with a new state are assigned into the level scheme of ^(39)Cl. the spin parity of 5/2^- for the lowest negative parity state in ^(39)Cl is reconfirmed using the combined γ transition information. these systematic observations of the negative parity states in ^(39)Cl allow a comprehensive comparison with the theoretical descriptions. the lowest 5/2^- state in ^(39)Cl remains exotic in terms of comparisons with existing theoretical calculations and with the neighboring isotopes having similar single-particle configurations. Further experimental and theoretical investigations are suggested.

关键词： Negative Parity States Crossing Major Shell Orbits immutable throughout

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日本在制冷技术方面的研究活动

低温与特气 1984年第3期2卷 1-6页

作者： t．fujita t．Ohtsuka Y．Ishizaki 顾荣而周志舰王荣荫不详光明所杭州制氧机研究所

日本在低温制冷领域(温度低于20K)开展的研究工作是东北大学从研究低温物理开始的。在早期研究工作阶段，除积累了一些基本物理数据外，还在制造氦液化器方面做了一番努力。可是，日本第一台氦液化器是一台进口的ADL柯林斯机器，该机于1... 详细信息

日本在低温制冷领域(温度低于20K)开展的研究工作是东北大学从研究低温物理开始的。在早期研究工作阶段，除积累了一些基本物理数据外，还在制造氦液化器方面做了一番努力。可是，日本第一台氦液化器是一台进口的ADL柯林斯机器，该机于1952年安装在东北大学。在随后的十年里，另外几所大学、

关键词：研究活动制冷技术日本东北大学氦液化器低温物理研究工作低温制冷工作阶段早期研究物理数据 ADL

Progress in Physics and technology Developments for the Modification of Jt-60

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Plasma Science and technology 2004年第1期6卷 2141-2150页

作者： H.tamai M.Matsukawa G.Kurita N.Hayashi K.Urata Y.M.Miura K.Kizu K.tsuchiya A.Morioka Y.Kudo S.Sakurai K.Masaki t.Suzuki M.takechi Y.Kamada A.Sakasai S.Ishida K.Abe A.Ando t.Cho t.Fujii t.fujita S.Goto K.Hananda A.Hatayama t.Hino H.Horiike N.Hosogane M.Ichimura tsuji-Iio S.Itoh M.Katsurai M.Kikuchi A.Kohyama H.Kubo M.Kuriyama M.Matsuoka Y.Miura N.Miya t.Mizuuchi K.Nagasaki H.Ninomiya N.Nishino Y.Ogawa K.Okano t.Ozeki M.Saigusa M.Sakamoto M.Satoh M.Shimada R.Shimada M.Shimizu t.takagi Y.takase t.tanabe K.toi Y.Ueda Y.Uesugi K.Ushigusa Y.Yagi t.Yamamoto K.Yatsu K.Yoshikawa Japan Atomic Energy Research Institute Naka Ibarahi 311-0193 Japan tohoku University University of tsukuba Osaka University Kyushu University Keio University Hokkaido University tokyo Institute of technology the University of tokyo Kyoto University Mie University Hiroshima University Central research Institute of Electric Power Industry Ibaraki University ItER JCt Nagoya University National Institute for Fusion Science Kanazawa University National Institute of Advanced Industrial Science and technology

Recent progress in the physics and engineering design study for themodification programme of Jt-60 is presented. In order to achieve a steady state high-βplasmaoperation, which is the dominant issue of this programme, physics design for the MHD control and thestability analysis is investigated. Engineering design and the R & D for the superconducting coils,irradiation shield are performed well towards the mission of programme.

关键词： modification of Jt-60 physics design technology developments

Spray,droplet evaporation,combustion,and emission characteristics of future transport fuels for compression-ignition engines:A review

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Journal of traffic and transportation Engineering(English Edition) 2024年第4期11卷 575-613页

作者： Leang So Khuong Nozomu Hashimoto Osamu fujita Division of Mechanical and Aerospace Engineering Faculty of Engineering Hokkaido University Faculty of Automotive Engineering National Polytechnic Institute of Cambodia

this review examines the potential of hydrogen, ammonia, and biodiesel as alternative fuels,focusing on spray dynamics, droplet evaporation, combustion, and emissions. Hydrogen offers superior combustion characteristics but faces challenges in NOxemissions. Strategies like nonpremixed direct injection, increased intake boost pressure, and low-pressure EGR are suggested for robust hydrogen combustion in compression-ignition engines. Control of hydrogen start of injection（SOI） and water injection（WI） are identified as effective techniques for reducing NOxemissions. Ammonia shows inferior combustion and higher NOxand unburned NH3emissions in the same conditions as conventional fuels with conventional engines. Understanding ammonia spray and evaporation conditions is significant for optimizing an ammonia-air mixture and minimizing wall impingement and ammonia trap in the crevice,thereby improving combustion and emission reduction. Increasing intake pressure, injection pressure, and EGR rate, employing a turbulent jet, and preheating ammonia improve efficiency and reduce NOxemissions. Utilizing ammonia combustion requires the implementation of after-treatment systems such as NH3adsorber and De NOxcatalysts to mitigate unburned NH3and NOxemissions. Biodiesel affects the fuel supply system, combustion, and emission characteristics according to its viscosity and density. Increasing injection pressure and blending with volatile fuels enhance spray and combustion. Optimum biodiesel preheating temperatures for the injection pump and injector are crucial for achieving the best pump capacity and spray formation. By utilizing biodiesel-PODE blends and investigating low-temperature biodiesel combustions, there is potential to improve thermal efficiency and PMNOxtrade-off. therefore, carbon-neutral fuel adoption should be accelerated to mitigate CO2emissions, highlighting the importance of combustion techniques and emissions reduction strategies.

关键词： Carbon-neutral fuels Spray formation Droplet evaporation Injection strategies Combustion efficiency Emission reduction

Moving doubly heavy baryon in a strongly coupled plasma via holography

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Chinese Physics C 2024年第8期48卷 42-55页

作者： Xuan Liu Jia-Jie Jiang Xun Chen Mitsutoshi fujita Akira Watanabe School of Nuclear Science and technology University of South ChinaHengyang 421001China School of Mathematics and Physics University of South ChinaHengyang 421001China

Gauge/gravity duality is used to study the properties of the doubly heavy baryon(QQq)at finite rapidity and temperature in heavy-ion *** investigate the impact of rapidity on string breaking and screening of QQq and compare these effects with the results for QQ¯in *** reveal that the string-breaking distances of QQq and QQ¯are close in the confined state,and the effects of rapidity and temperature on the string breaking are not *** interesting result shows that QQq cannot be determined at sufficiently high temperatures and ***,QQ¯can exist under any conditions as long as the separation distance is sufficiently ***,the screening distances of QQq and QQ¯are compared at finite rapidity and *** on the above analysis,we infer that QQ¯is more stable than QQq at finite rapidity and temperature.

关键词： holographic QCD QGP heavy quark