检索结果-南通市图书馆

Symmetries and exact solutions of discrete nonconservative systems

在线全文

学校读者我要写书评

暂无评论

science china(physics,Mechanics & Astronomy) 2010年第9期53卷 1699-1706页

作者： fu jingli1,LI XiaoWei2,LI ChaoRong1,ZHAO WeiJia3 & chen benyong4 1 institute of mathematical physics,zhejiang sci-tech university,hangzhou 310018,china 2 Department of physics,Shangqiu Normal university,Shangqiu 476000,china 3 Department of Mathematics,Qingdao university,Qingdao 266071,china 4 Faculty of Mechanical Engineering & Automation,zhejiang sci-tech university,hangzhou 310018,china 1. institute of mathematical physics Zhejiang Sci-Tech University Hangzhou 310018 China2. Department of Physics Shangqiu Normal University Shangqiu 476000 China3. Department of Mathematics Qingdao University Qingdao 266071 China4. Faculty of Mechanical Engineering & Automation Zhejiang Sci-Tech University Hangzhou 310018 China

Based on the property of the discrete model entirely inheriting the symmetry of the continuous system,we present a method to construct exact solutions with continuous groups of transformations in discrete nonconservative *** Noether's identity of the discrete nonconservative system is *** symmetric discrete Lagrangian and symmetric discrete nonconservative forces are defined for the *** quasi-extremal equations of discrete nonconservative systems are *** conserved quantities are derived with symmetries associated with the continuous *** have also found that the existence of the one-parameter symmetry group provides a reduction to a conserved quantity;but the existence of a two-parameter symmetry group makes it possible to obtain an exact solution for a discrete nonconservative *** examples are discussed to illustrate these results.

关键词： discrete nonconservative system symmetry conserved quantity quasi-extremal equation exact solution

Velocity-dependent symmetries and non-Noether conserved quantities of electromechanical systems

在线全文

学校读者我要写书评

暂无评论

science china(physics,Mechanics & Astronomy) 2011年第2期54卷 288-295页

作者： fu jingli chen benyong fu Hao ZHAO GangLing LIU RongWan ZHU ZhiYan institute of mathematical physics Zhejiang Sci-Tech UniversityHangzhou c. China Faculty of Mechanical Engineering & Automation Zhejiang Sci-Tech UniversityHangzhou 310018China china Jingye Engineering Corporation Limited Shenzhen Branch.Shenzhen 518054 China Shanghai university Shanghai Institute of Applied Mathematics and Mechanics Shanghai 200072 China Department of physics Shaoguan UniversityShaoguan 512005China

The theory of velocity-dependent symmetries(or Lie symmetry) and non-Noether conserved quantities are presented corresponding to both the continuous and discrete electromechanical ***,based on the invariance of Lagrange-Maxwell equations under infinitesimal transformations with respect to generalized coordinates and generalized charge quantities,the definition and the determining equations of velocity-dependent symmetry are obtained for continuous electromechanical systems;the Lie's theorem and the non-Noether conserved quantity of this symmetry are produced associated with continuous electromechanical ***,the operators of transformation and the operators of differentiation are introduced in the space of discrete variables;a series of commuting relations of discrete vector operators are ***,based on the invariance of discrete Lagrange-Maxwell equations under infinitesimal transformations with respect to generalized coordinates and generalized charge quantities,the definition and the determining equations of velocity-dependent symmetry are obtained associated with discrete electromechanical systems;the Lie's theorem and the non-Noether conserved quantity are proved for the discrete electromechanical *** paper has shown that the discrete analogue of conserved quantity can be directly demonstrated by the commuting relation of discrete vector ***,an example is discussed to illustrate the results.

关键词： velocity-dependent symmetry conserved quantity discrete electromechanical system

Two-dimensional materials for future information technology: status and prospects

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2024年第6期67卷 1-147页

作者： Hao QIU Zhihao YU Tiange ZHAO Qi ZHANG Mingsheng XU Peifeng LI Taotao LI Wenzhong BAO Yang CHAI Shula chen Yiqi chen Hui-Ming chenG Daoxin DAI Zengfeng DI Zhuo DONG Xidong DUAN Yuhan FENG Yu fu Jingshu GUO Pengwen GUO Yue HAO Jun HE Xiao HE Jingyi HU Weida HU Zehua HU Xinyue HUANG Ziyang HUANG Ali IMRAN Ziqiang KONG Jia LI Qian LI Weisheng LI Lei LIAO Bilu LIU Can LIU Chunsen LIU Guanyu LIU Kaihui LIU Liwei LIU Sheng LIU Yuan LIU Donglin LU Likuan MA Feng MIAO Zhenhua NI Jing NING Anlian PAN Tian-Ling REN Haowen SHU Litao SUN Yue SUN Quanyang TAO Zi-Ao TIAN Dong WANG Hao WANG Haomin WANG Jialong WANG Junyong WANG Wenhui WANG Xingjun WANG Yeliang WANG Yuwei WANG Zhenyu WANG Yao WE... School of Electronic science and Engineering Nanjing University School of Integrated Circuits Interdisciplinary Research Center for Future Intelligent Chips (Chip-X)Nanjing University School of Integrated Circuit science and Engineering Nanjing University of Posts and Telecommunications State Key Laboratory of Infrared physics Shanghai Institute of Technical Physics Chinese Academy of Sciences School of physics and Key Lab of Quantum Materials and Devices of the Ministry of Education School of Electronic Science & EngineeringSoutheast University College of Integrated Circuits State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University Suzhou Laboratory State Key Laboratory of Integrated Chips and Systems School of MicroelectronicsFudan University Shaoxin Laboratory Department of Applied physics The Hong Kong Polytechnic University Key Laboratory for Micro-Nano physics and technology of Hunan Province College of Materials Science and EngineeringHunan University College of Integrated Circuits Zhejiang University Shenzhen Geim Graphene Center Shenzhen Key Laboratory of Layered Materials for Value-Added ApplicationsTsinghua-Berkeley Shenzhen Institute & Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua University State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZijingang CampusZhejiang University National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences CAS Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinese Academy of Sciences College of Chemistry and Chemical Engineering Hunan University Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education) Department of PhysicsRenmin University of China School

Over the past 70 years, the semiconductor industry has undergone transformative changes,largely driven by the miniaturization of devices and the integration of innovative structures and materials. Two-dimensional(2D) materials like transition metal dichalcogenides(TMDs) and graphene are pivotal in overcoming the limitations of silicon-based technologies, offering innovative approaches in transistor design and functionality, enabling atomic-thin channel transistors and monolithic 3D integration. We review the important progress in the application of 2D materials in future information technology, focusing in particular on microelectronics and optoelectronics. We comprehensively summarize the key advancements across material production, characterization metrology, electronic devices, optoelectronic devices, and heterogeneous integration on silicon. A strategic roadmap and key challenges for the transition of 2D materials from basic research to industrial development are outlined. To facilitate such a transition, key technologies and tools dedicated to 2D materials must be developed to meet industrial standards, and the employment of AI in material growth, characterizations, and circuit design will be essential. It is time for academia to actively engage with industry to drive the next 10 years of 2D material research.

关键词： two-dimensional (2D) materials information technology production technology standardization of characterization microelectronic devices optoelectronic devices multi-functional integration

Emerging contaminants:A One Health perspective

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Innovation 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May fu Dong Zhu Karl JJobst chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao fu Zhong Wei Rainer Lohmann Changer chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-fung Law chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China university of Chinese Academy of sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina technical university of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial technology for Industrial Pollution Control of zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

Residual stress analysis and bow simulation of crystalline silicon solar cells

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

Journal of zhejiang university-science A(Applied physics & Engineering) 2017年第1期18卷 49-58页

作者： Chih-Hung chen Hsuan-Teh HU fu-Ming LIN Hsin-Hsin HSIEH Department of Civil Engineering National Cheng Kung University Tainan 701 China Green Energy & Environment Research Laboratories Industrial Technology Research Institute Hsinchu 310 China

The pressure to reduce solar energy costs encourages efforts to reduce the thickness of silicon wafers. Thus, the cell bowing problem associated with the use of thin wafers has become increasingly important, as it can lead to the cracking of cells and thus to high yield losses. In this paper, a systematic .approach for simulating the cell bowing induced by the firing process is presented. This approach consists of three processes：（1） the material properties are determined using a nanoidentation test; （2） the thicknesses of aluminum （AI） paste and silver （Ag） busbars and fingers are measured using scanning electron microscopy; （3） non-linear finite element analysis （FEA） is used for simulating the cell bowing induced by the firing process. As a result, the bowing obtained using FEA simulation agrees better with the experimental data than that using the bowing calculations suggested in literature. In addition, the total in-plane residual stress state in the wafer/cell due to the firing process can be determined using the FEA simulation. A detailed analysis of the firing-induced stress state in single crystalline silicon （sc-Si）, cast, and edge-defined film-fed growth （EFG） multi-crystalline silicon wafers of different thicknesses is presented. Based on this analysis, a simple residual stress calculation is developed to estimate the maximum in-plane principal stress in the wafers. It is also proposed that the metallization pattern, Ag busbars and fingers screen printed on the front of a solar cell, can be designed using this approach. A practical case ofa 3-busbar Si solar cell is presented.

关键词： Bow Solar cell Silicon solar cell Finite element analysis (FEA) Residual stress

Construction of isolated Ni sites on nitrogen-doped hollow carbon spheres with Ni-N_(3) configuration for enhanced reduction of nitroarenes

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第7期15卷 6001-6009页

作者： Binbin Feng Rou Guo Qiulan Cai Yaping Song Nan Li Yanghe fu De-Li chen Jiangwei Zhang Weidong Zhu fumin Zhang Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China Dalian National Laboratory for Clean Energy&State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Designing and synthesizing high-efficiency non-precious metal-based catalysts having uniform active sites increases the reactivity and selectivity of materials and provides a platform for an in-depth understanding of their catalytic reaction *** this study,we provided an approach for fabricating isolated nickel single-atom sites(Ni SAs)with high loading(4.9 wt.%)stabilized on nitrogen-doped hollow carbon spheres(NHCS)using a core–shell structured Zn/Ni bimetallic zeolitic imidazolate framework(ZIF)composite as the sacrificial *** as-fabricated Ni SAs/NHCS catalyst shows superior activity,selectivity,and recycling durability for the catalytic transfer hydrogenation of nitrobenzene to aniline,thus achieving 100%yield of aniline with a turn-over frequency(TOF)value as high as 29.9 h^(−1) under mild *** TOF value is considerably superior to the supported Ni nanoparticle *** experiments designed show that the hollow structure feature of NHCS facilitates accessible active sites and mass transfer,which thus contributes to the enhancement of the catalytic performance of Ni SAs/*** functional theory calculations show the high chemo-selectivity and activity of the Ni SAs catalyst,arising from the unique role of the single Ni-N3 site on simultaneously activating the H donor(N_(2)H_(4))and substrate,as well as the hydrogenation of the–NOH group as the rate-determining step.

关键词： single-atom catalyst chemo-selective reduction nitro compounds aromatic amines

基于浸入边界-格子波尔兹曼通量求解法的并列双圆柱流动特性数值研究（英文）

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

Journal of zhejiang university-science A(Applied physics & Engineering) 2018年第5期19卷 384-398页

作者： Xiao-di WU Hua-ping LIU fu chen Department of Energy science and Engineering Harbin Institute of Technology

目的:本文旨在应用新型数值求解方法,即浸入边界-格子波尔兹曼通量求解法,研究并列双圆柱流动特性,并探索该数值方法在工程应用中的可行性。创新点:1.将浸入边界法与格子波尔兹曼求解法相结合,简单并高效地实现在非均匀直角网格下求解... 详细信息

目的:本文旨在应用新型数值求解方法,即浸入边界-格子波尔兹曼通量求解法,研究并列双圆柱流动特性,并探索该数值方法在工程应用中的可行性。创新点:1.将浸入边界法与格子波尔兹曼求解法相结合,简单并高效地实现在非均匀直角网格下求解不可压流动以及动边界问题;2.应用浸入边界-格子波尔兹曼求解法研究并列双圆柱流场特性。方法:1.通过理论推导,建立状态变量和通量与格子波尔兹曼方程中粒子密度分布函数之间的关系(公式(8)^(10));2.采用强制浸入边界法处理流固界面使固壁表面满足无滑移边界条件,实现在笛卡尔网格下求解运动边界问题;3.通过数值模拟,探讨雷诺数和圆柱间距对静止双圆柱受力及流场尾流特性的影响以及雷诺数、间距和旋转速度对旋转并列双圆柱受力及尾流特性的影响规律。结论:1.浸入边界-格子波尔兹曼求解法可以简单实现采用非贴体网格求解不可压流动及动边界问题。2.对于并列静止双圆柱,随着间距的增加,双圆柱尾流场的相互作用逐渐消失,尾迹由无规则性转变为规则的同相位流动或反向流动;雷诺数影响圆柱受力系数。3.对于并列旋转双圆柱,雷诺数对旋转圆柱受力影响较弱;旋转速度可以抑制单圆柱尾流场的非定常效应;随着圆柱间距的增加,双圆柱后方形成固定的相位关系以及同一频率的脱落涡。

关键词：浸入边界法格子波尔兹曼通量求解法运动边界并列圆柱

science and Prediction of Heavy Rainfall over china:Research Progress since the Reform and Opening-Up of New china

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2020年第3期34卷 427-459页

作者： Yali LUO Jisong SUN Ying LI Rudi XIA Yu DU Shuai YANG Yuanchun ZHANG Jing chen Kan DAI Xueshun SHEN Haoming chen Feifan ZHOU Yimin LIU Shenming fu Mengwen WU Tiangui XIAO Yangruixue chen Huiqi LI Mingxin LI State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044 School of Atmospheric sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen UniversityGuangzhou 519082 Key Laboratory of Cloud–Precipitation physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 National Meteorological Center China Meteorological AdministrationBeijing 100081 State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 zhejiang institute of Meteorological sciences Zhejiang Meteorological BureauHangzhou 310008 School of Atmospheric sciences Chengdu University of Information TechnologyChengdu 610225 institute of Heavy Rain China Meteorological AdministrationWuhan 43020510 Institute of Tropical and Marine MeteorologyChina Meteorological Administration Guangzhou 510640 Southern Marine science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082 university of Chinese Academy of sciences Beijing 100049 CAS Center for Excellence in Tibetan Plateau Earth sciences Chinese Academy of Sciences(CAS)Beijing 100101

This paper reviews the major progress on development of the science and prediction of heavy rainfall over china since the beginning of the reform and opening-up of new china(roughly between 1980 and 2019).The progress of research on the physical mechanisms of heavy rainfall over china is summarized from three perspectives:1)the relevant synoptic weather systems,2)heavy rainfall in major sub-regions of china,and 3)heavy rainfall induced by *** development and application of forecasting techniques for heavy rainfall are summarized in terms of numerical weather prediction techniques and objective forecasting *** aided by the rapid progress in meteorological observing technology and substantial improvement in electronic computing,studies of heavy rainfall in china have advanced to investigating the evolution of heavy-rain-producing storms and observational analysis of the cloud microphysical features.A deeper and more systematic understanding of the synoptic systems of importance to the production of heavy rainfall has also been *** forecast of heavy rainfall in china has changed from subjective weather event forecasts to a combination of both subjective and objective quantitative precipitation forecasts,and is now advancing toward probabilistic quantitative precipitation forecasts with the provision of forecast uncertainty information.

关键词： heavy rainfall reform and opening-up of new china physical mechanisms forecasting techniques

Photodissociation Dynamics of OCS Near 128 nm:S(3PJ=2,1,0),S(1D2)and S(1S0)Channels

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical physics 2020年第2期33卷 167-172,I0002页

作者： Si-wen Wang Dao-fu Yuan Wen-tao chen Ling Tang Sheng-rui Yu Xue-ming Yang Xing-an Wang Hefei National Laboratory for Materials science at the Microscale and Department of Chemical physics University of Science and Technology of ChinaHefei 230026China hangzhou institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231China State key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of science Southern University of Science and TechnologyShenzhen 518055China

Here we report the study of the photodissociation dynamics of carbonyl sulfide in the vacuum ultraviolet region using the time-sliced velocity map ion imaging *** of S(^3PJ=2,1,0),S(^1D2)and S(^1S0)products were measured at four photolysis wave-lengths of 129.32,128.14,126.99,and 126.08 nm,*** main dissociation channels:S(^3PJ=2,1,0)+CO(X^1Σ^+),S(^3PJ=2,1,0)+CO(A^3π),S(^1D2)+CO(X^1Σ^+)and S(^1S0)+CO(X^1Σ^+)channels,have been clearly observed and *** states of the CO co-products were partially resolved in the experimental *** these images,the product total kinetic energy releases,the branching ratios and angular distributions of products have been *** the S(^3PJ=2,1,0)+CO(A^3π)product channel is formed through the adiabatic dissociation process after the excitation to the(3^1Σ^+)excited state,the results suggest that strong nonadiabatic coupling plays an important role in the formation of other three channels.

关键词： Vacuum ultraviolet photodissociation Carbonyl sulfide Velocity map ion imaging