检索结果-南通市图书馆

An Im.roved Coupled Level Set and Continuous m.m.nt-of-Fluid m.thod for Sim.lating m.ltiphase Flows with Phase Change

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Com.unications on Applied m.them.tics and Com.utation 2024年第2期6卷 1034-1069页

作者： Zhouteng Ye Cody Estebe Yang Liu m.hdi Vahab Zeyu Huang m.rk Sussm.n Alireza m.radikazerouni Kourosh Shoele Yongsheng Lian mitsuhiro Ohta m.Yousuff Hussaini ZJUI Institute Zhejiang UniversityHaining 314400ZhejiangChina Departm.nt of m.them.tics Florida State UniversityTallahasseeUSA Departm.nt of m.chanical Engineering Florida State UniversityTallahasseeUSA m.chanical and Aerospace Engineering m.thworks NatickMAUSA School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Departm.nt of m.chanical Engineering University of LouisvilleLouisvilleUSA Departm.nt of m.chanical Science Tokushima UniversityTokushimaJapan

An im.roved algorithm.for com.uting m.ltiphase flows is presented in which the m.ltim.terial m.m.nt-of-Fluid(m.F)algorithm.for m.ltiphase flows,initially described by Li et al.(2015),is enhanced addressing existing m.F difficulties in com.uting solutions to problem. in which surface tension forces are crucial for understanding salient flow *** Continuous m.F(Cm.F)m.thod is m.tivated in this *** Cm.F reconstruction m.thod inherently rem.ves the"checkerboard instability"that persists when using the m.F m.thod on surface tension driven m.ltiphase(m.ltim.terial)*** Cm.F reconstruction algorithm.is accelerated by coupling the Cm.F m.thod to the level set m.thod and coupling the Cm.F m.thod to a decision tree m.chine learning(m.)*** flow exam.les are shown in the two-dim.nsional(2D),three-dim.nsional(3D)axisym.etric"RZ",and 3D coordinate *** include two m.terial and three m.terial m.ltiphase flows:bubble form.tion,the im.ingem.nt of a liquid jet on a gas bubble in a cryogenic fuel tank,freezing,and liquid lens dynam.cs.

关键词： m.m.nt-of-Fluid(m.F) Surface tension Two phase flow Phase change Deform.ng boundaries with change(s)in topology Two-dim.nsional(2D) Three-dim.nsional(3D)axisym.etric 3D

Grain size altering yielding m.chanism. in ultrafine grained high-m. austenitic steel:Advanced TEm.investigations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of m.terials Science & Technology 2021年第27期86卷 192-203页

作者： Chang-Yu Hung Yu Bai Nobuhiro Tsuji mitsuhiro m.rayam. Departm.nt of m.terials Science and Engineering Virginia TechBlacksburgVA24061USA Departm.nt of m.terials Science and Engineering Kyoto UniversityYoshida-honmachiSakyo-kuKyoto606-8501Japan Elem.nts Strategy Initiative for Structural m.terials Kyoto UniversityYoshida-honmachiSakyo-kuKyoto606-8501Japan Institute for m.terials Chem.stry and Engineering Kyushu UniversityKasugaFukuoka8168580Japan

The underlying m.chanism.of discontinuous yielding behavior in an ultrafine-grained(UFG)Fe-31 m.-3 Al-3 Si(wt.%)austenitic TWIP steel was investigated by the use of advanced TEm.technique with taking the plastic deform.tion m.chanism. and their correlation with grains size near the m.croscopic yield point into *** yield drop m.chanism. such as the dislocation locking by the Cottrell atm.sphere due to the presence of interstitial im.urities cannot explain the origin of this phenom.non in the UFG high-m. austenitic TWIP ***,we experim.ntally revealed that the plastic deform.tion m.chanism. in the early stage of deform.tion,around the m.croscopic yield point,show an obvious association with grain *** specifically,the m.in m.chanism.shifts from.the conventional slip in grain interior to twinning nucleated from.grain boundaries with decreasing the grain size down to less than 1μ*** observation indicates that the grain size dependent deform.tion m.chanism. transition is also deeply associated with the discontinuous yielding behavior as it could govern the changes in the grain interior dislocation density of m.bile dislocations around the m.croscopic yield point.

关键词： Ultrafine grains TWIP steel Yield-drop phenom.non Deform.tion twin nucleation Structural defects Transm.ssion electron m.croscopy

维普期刊数据库

Catalyst-free growth of ZnO nanowires on various-oriented sapphire substrates by pulsed-laser deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Sem.conductors 2016年第2期37卷 20-24页

作者： Tetsuya Shim.gaki m.sahiro Takahashi m.saaki Yam.saki Taichi Fukuda mitsuhiro Higashihata Hiroshi Ikenoue Daisuke Nakam.ra Tatsuo Okada Departm.nt of Inform.tion Science and Electrical Engineering Kyushu University

Catalyst-free growth of one-dim.nsional zinc oxide （ZnO） nanowires is reported. ZnO nanowires were synthesized on ZnO buffer layers deposited on various-oriented sapphire substrates. Syntheses of ZnO buffer layers and nanowires were perform.d by ultraviolet pulsed-laser deposition. ZnO nanowire＇s num.er density was the lowest in the case of using m.cut sapphire substrates. ZnO nanowires grown on a-cut sapphire substrates had vertical alignm.nt with distances of tens to hundreds of nanom.ters. On the other hand, ZnO nanowires grown on c-cut sapphire substrates had the biggest nucleation rate. The dependence of crystalline orientation of ZnO buffer layers on the orientation of sapphire substrates were investigated by electron back scatter diffraction m.asurem.nt. From.their results, the growth m.dels of ZnO buffer layers were suggested and the variations in m.rphological properties ofZnO nanowires were discussed.

关键词： zinc oxide nanowire catalyst free growth pulsed laser deposition

维普期刊数据库

Two－Dim.nsional　m.del　of　Hydraulic　Fracturing　in　Geosciences：Effects　of　Fluid　Buoyancy

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1996年第2期15卷 216-222页

作者： Yoshito Nakashim. mitsuhiro Torium.(Geological Institute, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan)

Hydraulic fracturing occurs in diverse fields of geosciences. We introduce effects of fluid buoyancy into the CGDD (Christianovich-Geertsm.-DeKlerk-Daneshy) m.del of hydranlic fracturing. In the m.del, a two-dim.nsional one-sided crack in im.erm.able rock propagates from.a horizontally lying wellbore or fluid reservoir at depth; the crack plane is inclined at a prescribed angle to the horizontal; incom.ressible and Newtonian fluid less dense than the surrounding rock is injected consecutively from.the wellbore or fluid reservoir into the crack at a given injection rate. A solution of the crack propagation is obtained using lubrication theory for turbulent or lam.nar film.flow and linear elastic fracture m.chanics. The solution shows the im.ortance of the buoyancy of the fluid in the crack as a driving force or a resisting force of the crack propagation. For exam.le,when the water injection rate into a vertical fracture is 10-2 m./s and the vertical length of the propagating fracture exceeds 100 m. the fluid buoyancy is im.ortant (1) as a driving force if the fracture is form.d by the upward propagation of a vertical crack and (2) as a resisting force if it is form.d by the downward propagation.

关键词： buoyancy crack propagation dyke hydraulic fracturing hydrofracturing vein

维普期刊数据库

Arsenic Polluted Groundwater and Its Counterm.asures in the m.ddle Basin of the Ganges, Uttar Pradesh State, India

在线全文

学校读者我要写书评

暂无评论

Journal of Environm.ntal Protection 2012年第8期3卷 856-862页

作者： Yasunori Yano Kenichi Ito Akihiko Kodam. Koichiro Shiom.ri Shigeki Tom.m.tsu mitsuhiro Sezaki Hiroshi Yokota Center for International Relations University of Miyazaki Japan Faculty of Engineering University of Miyazaki Japan Retec Engineering INC Japan University of m.yazaki Miyazaki Japan

The arsenic contam.nation of groundwater in Uttar Pradesh State was first recognized in 2003 and is now seen at 20 Districts out of 70 Districts. University of m.yazaki has perform.d the arsenic m.tigation project in Bahraich District, severest arsenic-affected one in the 20 Districts, from.June 2008 until now, with JICA (Japan International Cooperation Agency). The integrated m.tigation, such as the raising awareness of villager, installing of alternative water supply units and healthcare of arsenocosis patients, have been executed at the 2 villages. The sym.tom.of the arsenocosis patients was not so severe, which will be, therefore, im.roved by drinking arsenic-safe water supplied through arsenic rem.val units, installed by this project. In this paper, following results is discussed for the situation and m.chanism.of arsenic contam.nation of groundwater, objected in connection with the installation of arsenic rem.val units: 1) Groundwater is alm.st contam.nated with arsenic in deep tubewell (depth: about 30 m., but scarcely in shallow tubewell (depth: about 10 m.;2) Arsenic contam.nated groundwater is under the reduced condition with the oxidized condition for no-arsenic contam.nated groundwater;3) Arsenic concentration shows alm.st linear correlation with concentrations of Fe2+ and -N;4) Ground is com.osed of sand with high arsenic content at around 25 m.depth;5) Arsenic exists m.inly in the phase of reducible fraction or weak acid soluble fraction but no oxidizable fraction in the ground.

关键词： Arsenic Contam.nation Ganges Groundwater Soil m.chanism Rem.val

Evaluation of preferable insertion routes for esophagogastroduodenoscopy using ultrathin endoscopes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第17期20卷 5045-5050页

作者： Satoshi Ono Keiko Niim. mitsuhiro Fujishiro Yu Takahashi Yoshiki Sakaguchi Chiem. Nakayam. Chihiro m.natsuki Rie m.tsuda Itsuko Hirayam.-Asada Yosuke Tsuji Satoshi m.chizuki Shinya Kodashim. Nobutake Yam.m.chi Atsuko Ozeki Lum.ne m.tsum.to Yum.ko Ohike Tsutom. Yam.zaki Kazuhiko Koike Center for Epidem.ology and Preventive m.dicine Graduate School of MedicineUniversity of TokyoTokyo 113-8655Japan Departm.nt of Gastroenterology Graduate School of MedicineUniversity of TokyoTokyo 113-8655Japan Departm.nt of Endoscopy and Endoscopic Surgery Graduate School of MedicineUniversity of TokyoTokyo 113-8655Japan

AIm. To evaluate the discom.ort associated with esophagogastroduodenoscopy (EGD) using an ultrathin endoscope through different insertion routes.

关键词： Esophagogastroduodenoscopy Ultrathin endoscope Visual analog scale

具有有效电流限制的InGaAsP双沟平面隐埋异质结激光器(De—PBH—LD)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

半导体光电 1986年第1期 23-30页

作者： IkuO m.to ,mitsuhiro Kitam.ra ,尹华琼

本文叙述了一种新的高性能1.3μm.InGaAsP半导体激光器,该器件实现了在有源区内的有效电流限制。它是在双异质晶片上刻出一对沟道来限定有源条形台面,再在台面两侧用LPE制作成一个P—n—P—n电流阻挡结构。因电流阻挡结构的改进,这种双... 详细信息

本文叙述了一种新的高性能1.3μm.InGaAsP半导体激光器,该器件实现了在有源区内的有效电流限制。它是在双异质晶片上刻出一对沟道来限定有源条形台面,再在台面两侧用LPE制作成一个P—n—P—n电流阻挡结构。因电流阻挡结构的改进,这种双沟平面隐埋异质结激光器(DC—PBH—LD)具有良好的激射性能。例如,外微分量子效率高达78%,电—光功率转换效率为43%,光输出功率在50m.以上。实验发现,增加P—复盖层掺杂浓度可使阈值电流温度敏感性明显降低,特征温度高达100k,直到130℃仍可CW(连续)工作。

关键词： LD 掺杂浓度盖层阻挡层异质结激光器有源区地层半导体激光器外微分量子效率电流限制 PBH De InGaAsP 双沟

High REDOX RESPONSIVE TRANSCRIPTION FACTOR1 Levels Result in Accum.lation of Reactive Oxygen Species in Arabidopsis thaliana Shoots and Roots

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

m.lecular Plant 2015年第8期8卷 1253-1273页

作者： mitsuhiro m.tsuo Joy m.chalJohnson Ayaka Hieno m.tsutom. Tokizawa m.ka Nom.to Yasuom. Tada Rinesh Godfrey Junichi Obokata Irena Sheram.ti Yoshiharu Y. Yam.m.to~l Frank-D. Boehm.r Ralf Oelm.ller Institute of Plant Physiology Friedrich-Schiller University Jena Dornburger StraSe 159 07743 Jena Germany Graduate School of Life and Environm.ntal Sciences Kyoto Prefectural University 1-5 Hangi-cho Shimogamo Sakyo-ku Kyoto 606-8522 Japan Faculty of Applied Biological Sciences Gifu University Yanagido 1-1 Gifu City 501-1193 Japan Center for Gene Research Nagoya University Furo-cho Chikusa-ku Nagoya 464-8601 Japan Institute of m.lecular Cell Biology Center for Molecular Biomedicine Jena University Hospital 00743 Jena Germany m.lecular Cardiology Department of Cardiovascular Medicine University Hospital M0nster 48149 M0nster Germany These authors contributed equally to this article.

Redox Responsive Transcription Factor1 （RRTF1） in Arabidopsis is rapidly and transiently upregulated by H202, as well as biotic- and abiotic-induced redox signals. RRTF1 is highly conserved in angio- sperm., but its physiological role rem.ins elusive. Here we show that inactivation of RRTF1 restricts and overexpression prom.tes reactive oxygen species （ROS） accum.lation in response to stress. Transgenic lines overexpressing RRTF1 are im.aired in root and shoot developm.nt, light sensitive, and susceptible to Alternaria brassicae infection. These sym.tom. are dim.nished by the beneficial root endophyte Piriform.spora indica, which reduces ROS accum.lation locally in roots and system.- cally in shoots, and by antioxidants and ROS inhibitors that scavenge ROS. m.re than 800 genes were detected in m.ture leaves and seedlings of transgenic lines overexpressing RRTF1; ∽40% of them.have stress-, redox-, ROS-regulated-, ROS-scavenging-, defense-, cell death- and related functions. Bioinform.tic analyses and in vitro DNA binding assays dem.nstrate that RRTF1 binds to GCC-box-like sequences in the prom.ter of RRTFl-responsive genes. Upregulation of RRTF1 by stress stim.li and H202 requires WRKY18/40/60. RRTF1 is co-regulated with the phylogenet- ically related RAP2.6, which contains a GCC-box-like sequence in its prom.ter, but transgenic lines overexpressing RAP2.6 do not accum.late higher ROS levels. RRTF1 also stim.lates system.c ROS accum.lation in distal non-stressed leaves. We conclude that the elevated levels of the highly conserved RRTF1 induce ROS accum.lation in response to ROS and ROS-producing abiotic and biotic stress signals.

关键词： abiotic and biotic stress reactive oxygen species H202 REDOX RESPONSIVE TRANSCRIPTIONFACTOR1 RAP2.6 RRTF1 prom.ter binding sites

柴油机凸轮和挺柱的摩擦学研究——减少摩擦并防止磨损和擦伤

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

汽车与新动力 1999年第1期 3-14页

作者： mitsuhiro Soejina Yutaro Wakuri Yoshito Ejim. 沈永生

对发动机配气机构的凸轮和挺柱进行了摩擦学方面的试验和分析研究,以减少摩擦或防止磨损和擦伤。在专供凸轮和滑动式从动件或凸轮和滚子式挺柱的试验设备上,获得了有关接触载荷、摩擦力、磨损速率或出现擦伤时的临界接触载荷的试验数据... 详细信息

对发动机配气机构的凸轮和挺柱进行了摩擦学方面的试验和分析研究,以减少摩擦或防止磨损和擦伤。在专供凸轮和滑动式从动件或凸轮和滚子式挺柱的试验设备上,获得了有关接触载荷、摩擦力、磨损速率或出现擦伤时的临界接触载荷的试验数据。首先,通过对可应用的材料,即淬硬球墨铸铁、中碳钢（S48C）、粉末冶金和陶瓷材料进行摩擦方面的比较,分析材料性能和表面粗糙度对减少摩擦的作用。同时也仔细分析了润滑油粘度或添加剂以及润滑油品质降低对减少摩擦的影响。此外,也查明了由凸轮轴和凸轮工作段的油孔供油或采用滚子式挺柱对减少摩擦的影响。其次,探讨了在采用含碳黑的使用过的润滑油润滑时,磨损速率与凸轮轴转速之间的关系,以评估凸轮从动件材料,即冷激铸铁、氮化硅陶瓷和其他陶瓷对防止磨损的作用。最后,根据对各种材料的抗擦伤性能的评定,确定了最佳的材料配对和合适的表面粗糙度。同时,根据基础油粘度或润滑油添加剂对抗擦伤性能影响的评定,也确定了由抗磨添加剂伯醇二烷基二硫代磷酸锌（1ryZnDTP）或仲醇二烷基二硫代磷酸锌（2ryZnDTP）和摩擦改良剂二烷基二硫代磷酸钼（m.oDTP）或二烷基二硫代氨基甲酸钼（m.oDTP）组成的、效果良好的混合添加剂。此外,还确定了有效防止擦伤的凸轮工作段的油孔位置。最后,总结了这项研究,提出了凸轮/从动件的合理结构或材料,润滑剂性能或添加剂的合理组合,以及可用于改善凸轮和凸轮从动件之间润滑状况的技术方案。

关键词：柴油机凸轮挺柱摩擦学试验研究