检索结果-南通市图书馆

Transient growth in Poiseuille-Rayleigh-Bénard flows of binary fluids with Soret effect

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

applied {1. and Mechanics(English Edition) 2016年第9期37卷 1203-1218页

作者： jun {1. D.HENRY H.BENHADID {2. yin Institute of applied {1. and {2. mathematics Beijing 100088China Laboratoire de Mecanique des Fluides et d'Acoustique CNRS/Universitd de LyonEcole Centrale de Lyon/universite Lyon 1/INSA de LyonECL36 avenue Guy de Collongue69134 Ecully CedexFrance Department of Modern Mechanics University of Science and Technology of ChinaHefei 230027China

The transient growth due to non-normMity is investigated for the Poiseuille- Rayleigh-Benard problem of binary fluids with the Soret effect. For negative separation factors such as ψ = -0.1. it is found that a large transient growth can be obtained by the non-normal interaction of the two least-stable-modes, i.e., the upstream and downstream modes, which determine the linear critical boundary curves for small Reynolds numbers. The transient growth is so strong that the optimal energy amplification factor G（t） is up to 1.^2.- 1.^3. While for positive separation factors such as ψ = 0.1. the transient growth is weak with the order O（I） of the amplification factor, which can even be computed by the least-stable-mode. However, for both cases, the least-stable-mode can govern the long-term behavior of the amplification factor for large time. The results also show that large Reynolds numbers have stabilization effects for the maximum amplification within moderate wave number regions. Meanwhile, much small negative or large positive separation factors and large Rayleigh numbers can enlarge the maximum transient growth of the pure streamwise disturbance with the wavenumber α= 3.1.. Moreover, the initial and evolutionary two-dimensional spatial patterns of the large transient growth for the pure streamwise disturbance are exhibited with a plot of the velocity vector, spanwise vorticity, temperature, and concentration field. The initial three-layer cell vorticity struc- ture is revealed. When the amplification factor reaches the maximum Gmax, it develops into one cell structure with large amplification for the vorticity strength.

关键词： binary fluid Soret effect transient growth Poiseuille-Rayleigh-Benard flow

Global sensitivity analysis based on high-dimensional sparse surrogate construction

在线全文

学校读者我要写书评

暂无评论

applied {1. and Mechanics(English Edition) 2017年第6期38卷 797-814页

作者： jun {1. S{1.dao ZHANG Institute of applied {1. and {2. mathematics

Surrogate models are usually used to perform global sensitivity analysis （GSA） by avoiding a large ensemble of deterministic simulations of the Monte Carlo method to provide a reliable estimate of GSA indices. However, most surrogate models such as polynomial chaos （PC） expansions suffer from the curse of dimensionality due to the high-dimensional input space. Thus, sparse surrogate models have been proposed to alleviate the curse of dimensionality. In this paper, three techniques of sparse reconstruc- tion are used to construct sparse PC expansions that are easily applicable to computing variance-based sensitivity indices （Sobol indices）. These are orthogonal matching pursuit （OMP）, spectral projected gradient for L1.minimization （SPGL1., and Bayesian compressive sensing with Laplace priors. By computing Sobol indices for several benchmark response models including the Sobol function, the Morris function, and the Sod shock tube problem, effective implementations of high-dimensional sparse surrogate construction are exhibited for GSA.

关键词： global sensitivity analysis (GSA) curse of dimensionality sparse surrogate construction polynomial chaos (PC) compressive sensing

室外风环境视角下的高层住宅项目规划指标研究（英文）

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(applied {1. & Engineering) 2016年第5期17卷 378-388页

作者： Xiao-yu yinG Grace DING Xiao-{1. {2. yin-qi ZHANG Department of Architecture Zhejiang University City College School of the Built Environment University of Technology Sydney Department of Building Innovation Technology Shanghai Research Institute of Building Sciences (Group) Co. Ltd.

目的：确定建筑容积率、建筑密度和建筑层数之间的关系,并将其作为主要的规划指标,研究其对室外风环境的影响。创新点：在以高层、高密度为特点的城市建设中,一个地块的用地规划指标可直接影响居住区的室外物理环境质量。一个高层建筑... 详细信息

目的：确定建筑容积率、建筑密度和建筑层数之间的关系,并将其作为主要的规划指标,研究其对室外风环境的影响。创新点：在以高层、高密度为特点的城市建设中,一个地块的用地规划指标可直接影响居住区的室外物理环境质量。一个高层建筑群的规划设计不应该只关注建筑物,还应考虑室外物理环境的品质。本研究从室外风环境角度出发,对1.种＂容积率-建筑密度-建筑层数＂指标组合形成的高层建筑群布局进行对比,从而得到可直接服务于城市建设项目的规划策略。方法：1.通过确定建筑容积率、建筑密度和建筑层数之间的关系,建立三维高层建筑群布局模型,列出1.种可能的指标组合（图2.;2.通过日照模拟分析工具Tarch和建筑消防间距计算筛选出1.种符合当前规划要求的指标组合;3.运用风环境模拟软件Phoenics,对1.种指标组合形成的高层建筑群布局进行风环境模拟运算;利用图形分析软件Photoshop CS,计算出舒适风面积比值,并进行相互对比（图3和4）;4.根据土建造价对不同建筑群布局的总造价进行对比（图6）。结论：在规划设计中,通常认为较低的容积率和较低的建筑高度意味着建筑体量较小,室外物理环境会更好。但是,本研究发现建筑层数越多、建筑高度越高,行人高度的室外舒适风区面积越大。不过,建筑层数从2.层升到30层,舒适风区面积增加有限。加之考虑层数越高导致造价越高的因素,当面对容积率为2.0~4.0的高层地块时,不能简单地认为建筑层数最高的规划方案就是最好的方案。

关键词：室外风环境规划指标建筑群布局高层建筑

Energy levels and magnetic dipole transition parameters for the nitrogen isoelectronic sequence

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2022年第9期31卷 103-110页

作者： Mu-Hong hu Nan Wang Pin-{1. Ouyang Xin-Jie Feng Yang Yang Chen-Sheng Wu School of physics and Electronic Technology Liaoning Normal UniversityDalian 116029China Institute of applied {1. and {2. mathematics Beijing 100094China

Theoretical calculations of the energy levels and magnetic dipole transition parameters for the 1.^(2.2.^(2.2.^(3) and 1.^(2.2.^(5) configurations of nitrogen isoelectronic sequence with Z=2.0}30 are performed using multi-congfiguration Dirac-Fock(MCDF)*** on the relativistic computational code GRASP2. compiled within the framework of MCDF method,the electron correlations,Breit interaction and QED effects are well treated in *** energy levels,line strengths and transition rates of magnetic dipole transition are obtained and compared with the experimental data *** most cases,good agreements are achieved and the relative differences of them are less than 0.1.4%,8.43% and 9.80%,*** scaling laws of the fine structure splitting and transition rate are obtained on the isoelec-tronic sequence and the corresponding physical mechanisms are *** data sets for tables are openly available at https://***/1..57760/sciencedb.j001.3.0002..

关键词： energy level magnetic dipole transition transition rate scaling law nitrogen-like ions multicongfiguration Dirac-Fock(MCDF)method

SiC电子输运特性的Monte Carlo数值模拟

在线全文

学校读者我要写书评

暂无评论

计算物理 2005年第3期22卷 245-250页

作者：王平杨银堂屈汉章杨燕李跃进贾护军西安电子科技大学宽禁带半导体材料与器件教育部重点实验室陕西西安710071 西安邮电学院数理系陕西西安710069

　利用系综MonteCarlo法研究了2. ,4H 和6HSiC的电子输运特性.在模拟中考虑了对其输运过程有着重要影响的声学声子形变势散射、极化光学声子散射、谷间声子散射、电离杂质散射以及中性杂质散射.通过计算,获得了低场下这几种不同SiC多型... 详细信息

　利用系综MonteCarlo法研究了2. ,4H 和6HSiC的电子输运特性.在模拟中考虑了对其输运过程有着重要影响的声学声子形变势散射、极化光学声子散射、谷间声子散射、电离杂质散射以及中性杂质散射.通过计算,获得了低场下这几种不同SiC多型电子迁移率同温度的关系,并以4H SiC为例,重点分析了中性杂质散射的影响.最后对高场下电子漂移速度的稳态和瞬态变化规律进行了研究.将模拟结果同已有的实验数据进行了比较,发现当阶跃电场强度为1.0×1.6V·cm-1.,4H Sic电子横向瞬态速度峰值接近3 3×1.7cm·s-1.6H Sic接近3 0×1.7cm·s-1.

关键词：电子输运特性数值模拟 4H-SiC Carlo法杂质散射 6H-Sic 声子散射电子迁移率声学声子输运过程实验数据模拟结果变化规律漂移速度电场强度形变势中性瞬态接近系综光学电离

CEPC Technical Design Report

在线全文

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia {1.a Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai {1.acheng Cai Lorenzo Calibbi junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrab{1.ti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen {1.a-Xing Chen {1.irun Chen Jin{1.i Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mings{1.i Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen C{1.n{1.i Chen Hok C{1.en Cheng {1.ajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-C{1.ng C{1. Xiaotong C{1. Ziliang C{1. Guglielmo Coloretti Andreas Crivellin Han{1.a Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core S{1.angxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng B{1.pal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui University HefeiAnhui applied {1. Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu University Institute of ScienceVaranasi Bandirma Onyedi Eylul University Bandirma Beihang University Beijing Beijing computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal University Beijing Brown University ProvidenceRI Budker Institute of Nuclear physics Novosibirsk Cadi Ayyad University Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo University Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central China Normal University WuhanHubei Central South University ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan China academy of engineering physics MianyangSichuan China building materials academy Beijing China Center of Advanced Science and Technology Beijing China Institute of Atomic Energy Beijing China Jiliang University HangzhouZhejiang China Nuclear Instrument CO. LTDBeijing China University of Geosciences Beijing China University of Geosciences WuhanHubei China University of Mining and Technology XuzhouJiangsu China West Normal University NanchongSichuan Chongqing University Department of PhysicsChongqing Chulalongkorn University Bangkok City University of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell University IthacaNY CPPM(AMU/IPhu&CNRS/INP) Marseille Dalian Minzu University DalianLiaoning Dalian University of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East China University Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1.GeV Damping Ring,a Booster capable of achieving energies up to 1.0 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 1.0 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×1.^(34)cm^(-2.s^(-1.per interaction point(IP),resulting in an integrated luminosity of 1. ab^(-1.for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,{1.5)and the Conceptual Design Report(CDR,{1.8),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2.2.-2.2.,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2.30s.

关键词： initiated exceeding precise

相邻双侧边盖驱动方腔流动的三维线性整体稳定性

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

气体物理 2018年第3期3卷 1-8页

作者：胡军李杰权北京应用物理与计算数学研究所计算物理实验室北京100088

文章考察了相邻双侧边盖驱动方腔流动(即上壁面向右运动和左侧壁面向下运动)的三维线性整体稳定性.首先,采用Taylor-Hood有限元方法并经由Newton迭代过程计算得到双侧边盖驱动方腔流动的二维稳态基本流.其次, Taylor-Hood有限元在Chebys... 详细信息

文章考察了相邻双侧边盖驱动方腔流动(即上壁面向右运动和左侧壁面向下运动)的三维线性整体稳定性.首先,采用Taylor-Hood有限元方法并经由Newton迭代过程计算得到双侧边盖驱动方腔流动的二维稳态基本流.其次, Taylor-Hood有限元在Chebyshev Gauss配置点上进行离散,同时Gauss配置点也可以用于线性稳定性方程的高阶有限差分格式离散.然后,离散得到的矩阵形式的广义特征值问题可以结合shift-and-invert算法采用隐式重启Arnoldi方法计算.最后,通过对线性稳定性方程特征值的计算,发现了一个最不稳定的驻定模态和两对对称行波模态.最不稳定的三维驻定模态的临界Reynolds数为Re_c=2.1.5,远远小于二维不稳定的临界Reynolds数Re_c^(2.)=1.061.7.通过画出这3类三维不稳定模态的流向扰动速度和扰动涡量的空间等值面图像,可以发现不稳定扰动位于稳态基本流的两个主涡区域,因此可以认为主涡区域是三维扰动失稳的主要能量来源地.

关键词：边盖驱动方腔流动整体稳定性临界Reynolds数行波模态 Taylor—Hood有限元

Measurement of the ^(2.2.Th(n,f)cross section in the 1.2.0 MeV range at the CSNS Back-n

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第8期34卷 142-153页

作者： Zhi-Zhou Ren Yi-Wei Yang Yong-Hao Chen Rong Liu Bang-Jiao Ye Jie Wen Hai-Rui Guo Zi-Jie Han Qi-Ping Chen Zhong-Wei Wen Wei-Li Sun Han Yi Xing-Yan Liu Tao Ye Jiang-Bo Bai Qi An Jie Bao Yu Bao Ping Cao Hao-Lei Chen Zhen Chen Zeng-Qi Cui Rui-Rui Fan Chang-Qing Feng Ke-Qing Gao Xiao-Long Gao Min-Hao Gu Chang-Cai Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei hu Han-Xiong huang Xi-Ru huang Hao-Yu Jiang Wei Jiang Zhi-Jie Jiang Han-Tao Jing Ling Kang Bo Li Chao Li Jia-Wen Li Qiang Li Xiao Li Yang Li Jie Liu Shu-Bin Liu Ze Long Guang-Yuan Luan Chang-jun Ning Meng-Chen Niu Bin-Bin Qi Jie Ren Xi-Chao Ruan Zhao-hui Song Kang Sun Zhi-Jia Sun Zhi-Xin Tan Jing-Yu Tang Xin-Yi Tang Bin-Bin Tian Li-Jiao Wang Peng-Cheng Wang Zhao-hui Wang Xiao-Guang Wu Xuan Wu Li-Kun Xie Xiao-Yun Yang Li Yu Tao Yu Yong-Ji Yu Guo-hui Zhang Lin-Hao Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-Liang Zhang Zhi-Yong Zhang Lu-Ping Zhou Zhi-Hao Zhou Ke-jun Zhu Department of Modern physics University of Science and Technology of ChinaHefei 230026China Institute of Nuclear physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Institute of High Energy physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Institute of applied {1. and {2. mathematics Beijing 100088China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230027China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Nuclear physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and applied {1. University of Science and Technology of ChinaHefei 230026China

The ^(2.2.Th(n,f)cross section is very important in basic nuclear physics and applications based on the Th/U fuel *** the time-of-flight method and a multi-cell fast-fission ionization chamber,a novel measurement of the^(2.2.Th(n,f)cross sec-tion relative to^(2.5)U in the 1.2.0 MeV range was performed at the China Spallation Neutron Source Back-n white neutron source(Back-n).The fission event-neutron energy spectra of^(2.2.Th and^(2.5)U fission cells were measured in the single-bunch *** 2.2.h/2.5U fission cross-sectional ratios were obtained,and the measurement uncertainties were 2.5–3.7%for energies in the 2.2. MeV range and 3.6–6.2.for energies in the 2.–2.0 MeV ***^(2.2.Th(n,f)cross section was obtained by introducing the standard cross section of^(2.5)U(n,f).The results were compared with those of previous theoreti-cal calculations,measurements,and *** measured 2.2.h fission cross section agreed with the main evaluation results in terms of the experimental uncertainty,and 2.2.h fission resonances were observed in the 1.3 MeV *** present results provide^(2.2.Th(n,f)cross-sectional data for the evaluation and design of Th/U cycle nuclear systems.

关键词： 2.2.h(n f)cross section Fast-fission ionization chamber Back-n white neutron source