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Finite element simulations of deformation behavior in equal channel angular pressing using a rotated die

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Acta Metallurgica Sinica(English Letters) 2012年第5期25卷 357-364页

作者： Yixuan tan School of Material Science and Engineering Central South University Changsha 410083 China Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute TroyNY 12180 USA Key Laboratory of Nonferrous Metal Materials Science and Engineering of the Ministry of Education Central South University Changsha 410012 China

A new die design for equal channel angular pressing （ECAP） of square cross-section billet was proposed by a 45° rotation of the inlet and outlet channels around the channel axes. ECAP utilizing the rotated and conventional dies was simulated in three dimensions using the finite element method. Conditions with different material properties and friction coefficients were studied. The billet deformation behavior was evaluated in terms of the spatial distribution of equivalent plastic strain, plastic deformation zone and load history. The results show that the rotated die appears to produce billets with a smaller deformation inhomogeneity over the entire cross- section and a greater average of equivalent plastic strain at the cost of a slightly larger working load. The billet deformdtion enters into a Steady s^ate earlier in the case of the rotated die than the conventional die under the condition of a relatively large friction coefficient.

关键词： Equal channel angular pressing Finite element method Defor-mation behavior

Protecting healthcare personnel from 2019-nCoV infection risks:lessons and suggestions

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Frontiers of Medicine 2020年第2期14卷 229-231页

作者： Zhiruo Zhang Shelan Liu Mi Xiang Shijian Li Dahai Zhao chaolin Huang Saijuan Chen School of Public Health Shanghai Jiao Tong University School of MedicineShanghai 200025China Department of Infectious Diseases Zhejiang Provincial Centre for Disease Control and PreventionHangzhou 310000China Department of Public Health SUNY College at Old WestburyOld WestburyNY 11568USA School of International and Public Affairs Shanghai Jiao Tong UniversityShanghai 200025China Department of Infectious Diseases Jinyintan HospitalWuhan 430030China Key Laboratory of Medical Genomics Shanghai Institute of HematologyNational Research Center for Translational MedicineRuijin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200025China

The outbreak of a novel coronavirus disease(COVID-19,caused by the 2019-nCoV infection)in December 2019 is one of the most severe public health emergencies since the founding of People’s Republic of China in *** personnel(HCP)nationwide are facing heavy workloads and high risk of infection,especially those who care for patients in Hubei ***,as of February 20,2020,over two thousand COVID-19 cases are confirmed among HCP from 476 hospitals nationwide,with nearly 90%of them from Hubei *** on literature search and interviews with some HCP working at Wuhan,capital city of Hubei,we have summarized some of the effective measures taken to reduce infection among HCP,and also made suggestions for improving occupational safety during an infectious disease *** experience and lessons learned should be a valuable asset for international health community to contain the ongoing COVID-19 epidemic around the world.

关键词： healthcare personnel COVID-19 infectious diseases

Iron-induced NaTi2（PO4）3 with regulated electronic structure enables freshwater harvesting based on rocking-chair desalination battery

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Science China Chemistry 2024年

作者： Yuliang Wu Chen Ling chaolin Li Wenhui Wang School of Civil and Environmental Engineering Harbin Institute of Technology School of Environment and Resources Taiyuan University of Science and Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Despite the promising potential of NaTi2（PO4）3as desalination battery electrode,its mediocre seawater desalination capacity and durability fail to meet the requirements of practical ***,the substitution of Ti by Fe in NaTi2（PO4）3(NT2-xFxP),which possesses a stronger electronegativity relative to Ti,can regulate the electronic structure,thus facilitating charge transfer and ion diffusion during the desalination *** kinetic and thermodynamic facilitation of NT2-xFxP is clarified by the electrochemical analyses and DFT ***,the additional redox center and solid-solution reaction mechanism induced by Fe-dopant further contribute to a superior desalination performance of NT2-xFxP in different seawater *** from the multifunctional effect of Fe-dopant,the optimal NT1.7F0.3P delivers a large salt removal capacity(173.6 mg g-1) with an ultrahigh salt removal rate (8.48 mg g-1min-1),and maintains 96.6%of desalination capacity after 500cycles in natural ***,the assembled NT1.7F0.3P||NaFeHCF rocking-chair desalination battery （RCDB） demonstrates a higher desalination performance than that of reported RCDB systems,and can desalinate natural seawater to freshwater standards under continuous desalination mode for the first time in RCDB *** work provides a facile but effective strategy to modulate the electronic structure of NaTi2（PO4）3for RCDB,and exploits a new perspective for developing scalable RCDB devices for continuous desalinating real seawater to freshwater.

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Experimental demonstration of D-band signals wireless transmission over 30 km

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Science China Technological Sciences 2025年

作者： Yi WEI Xiongwei YANG Jianjun YU Xianming ZHAO Mingxu WANG Jingwen tan Weiping LI Feng ZHAO Chengzhen BIAN Hansong MA Qinyi ZHANG Qiutong ZHANG Bing ZHANG Wen ZHOU Kaihui WANG Sicong XU Jianguo YU State Key Laboratory of ASIC and System Key Laboratory for Information Science of Electromagnetic Waves (MoE)and School of Information Science and Technology Fudan University Harbin Institute of Technology School of Automation Xi'an University of Posts and Telecommunications School of Electronic Engineering Beijing University of Posts and Telecommunications

Due to the rise of innovative technologies like artificial intelligence(AI),the Internet of Things(IoT), and telemedicine, the demand for internet traffic is rapidly increasing. In order to achieve ultra-high-speed wireless communication, many researchers are directing their efforts towards the Dband. The D-band, spanning the frequency band 110–170 GHz, has abundant spectrum resources and license-free characteristics [1,2].

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Genome-wide transcriptome analysis of roots in two rice varieties in response to alternate wetting and drying irrigation

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The Crop Journal 2020年第4期8卷 586-601页

作者： Tao Song Debatosh Das Feng Yang Moxian Chen Yuan Tian chaolin Cheng Chao Sun Weifeng Xu Jianhua Zhang Shenzhen Research Institute The Chinese University of Hong KongShenzhen 518057GuangdongChina Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China Hunan Agricultural UniversityChangsha 410128HunanChina College of Horticulture Nanjing Agricultural UniversityNanjing 210095JiangsuChina Center for Plant Water-use and Nutrition Regulation and College of Life Sciences Joint International Research Laboratory of Water and Nutrient in CropFujian Agriculture and Forestry UniversityFuzhou 350002FujianChina Department of Biology Hong Kong Baptist UniversityKowloonHong KongChina State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongShatinHong KongChina

Alternate wetting and drying(AWD)irrigation has been widely used as an efficient rice production method to obtain better yield without continuous flooding(CF)of the paddy ***,how this practice affects gene expression to regulate rice physiology and morphology is largely *** this study,we used two rice varieties,Nipponbare,a lowland rice cultivar,and Gaoshan 1,an upland cultivar,and found that root dry weight(RDW)and root oxidation activity(ROA)in both cultivars substantially increased in response to *** then analyzed the differences in transcriptome profiles of their roots irrigated in AWD *** *** responsive genes are mainly involved in lignin biosynthetic pathway and phytohormone signal transduction pathway and belong mainly to b HLH,b ZIP,NAC,WRKY,and HSF transcription factor *** discussed how these differentially expressed genes may contribute to the morphological adaptations observed in roots exposed to *** analysis also provides useful information to explain the similarities and differences in adaptation to AWD irrigation between the two rice ecotypes.

关键词： cultivar paddy roots

基于GTWR模型的长江经济带城市群减污降碳及其影响因素分析

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湖南工业大学学报 2025年第2期39卷 42-51页

作者：谭德明张宇南华大学经济管理与法学学院湖南衡阳421200

以长江经济带三大城市群71个城市为研究对象,使用耦合协调度模型测度2011—2020年三大城市群减污降碳协调度,使用时空地理加权回归(GTWR)模型探究各城市群减污降碳影响因素的时空异质性。结果表明,研究期内长江经济带三大城市群减污降... 详细信息

以长江经济带三大城市群71个城市为研究对象,使用耦合协调度模型测度2011—2020年三大城市群减污降碳协调度,使用时空地理加权回归(GTWR)模型探究各城市群减污降碳影响因素的时空异质性。结果表明,研究期内长江经济带三大城市群减污降碳协调度整体呈上升趋势,截至2020年,三大城市群减污降碳均达到协调状态,其协调度由高到低依次为成渝城市群、长江中游城市群、长三角城市群;影响因素回归结果显示,城镇化、科技创新和环境规制能够促进减污降碳协同,人口集聚、产业结构则会抑制减污降碳,而经济发展水平、对外开放在三大城市群间表现出明显的时空异质性。基于此,从经济发展、社会进步、科技创新以及政策规制层面提出差异化的减污降碳协同治理策略,助力各城市群乃至长江经济带减污降碳目标的实现。

关键词：减污降碳长江经济带城市群污染物减排碳减排

Communications in Theoretical Physics

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Communications in Theoretical Physics 2020年第5期72卷 1-12页

作者： Zhi-Zhong tan Zhen tan Department of Physics Nantong UniversityNantong226019China School of Information Science and Technology Nantong UniversityNantong 226019China

The unified processing and research of multiple network models are implemented,and a new theoretical advance has been made,which sets up two new theorems on evaluating the exact electrical characteristics(potential and resistance)of the complex m×n resistor networks by the recursion-transform method with potential parameters,and applies to a variety of different types of lattice structure with arbitrary boundaries such as the nonregular m×n rectangular networks and the nonregular m×n cylindrical *** research gives the analytical solutions of electrical characteristics of the complex networks(finite,semi-infinite and infinite),which has not been solved *** applications of the theorems,a series of analytical solutions of potential and resistance of the complex resistor networks are discovered.

关键词： complex network RT-V method electrical properties boundary conditions Laplace equation mathematical physics

CHALLENGES AND CORRESPONDING POLICIES FOR CHINA'S URBAN SUSTAINABLE DEVELOPMENT

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Journal of Geographical Sciences 1996年第1期6卷 72-77页

作者： Gu chaolin(Institute of Geography, CAS, Beijing 100101People’s Republic of China) Inst of Geography CAS Beijing 100101 China

Since the late 1970s, China'S economy has been growing very fast with an average rate of over 8 percent annually. Urbanization has become the indicator of economic and secial deveopment in China. Rapid growth of oromy in China pushed the process of urbanization. Since 1978, China's urban non-agricultural population has grown from under 113.4 million in 1977 to 176.09 million in 1993. The number of cities increased from 188 to 617 in 1994. With urban economic activities making up an increasing share of GDP, preductivity of urban economy will heavily influence economic growth. In eastern coastal area, because economy of larger scale and agglomeration has been made more productive, the forces contributing to urban growth bome *** number of cities has increased from 78 to 247 since 1980. Urban population was over 90 million. The urbanization level reached 31.5 peed. Four megalopolises have been emerged, they are : the Shanghai -Nanjing-Hangzhou region, the Pearl River Delta region, the Beijing-Tianjin- tangshan region and the Shenyang-Dalian region. According to statistics, the area of these four regions occupies about 2.6 perat of China's total territory, but their GDP has exceeded 35 percent of the country's total. However, the rapid urbanization also resulted in a series of problems on deveopment and environment.

关键词： urbanization environmental protection sustainable development urban fringe China

Electrical properties of m×n cylindrical network

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Chinese Physics B 2020年第8期29卷 182-197页

作者： Zhi-Zhong tan Zhen tan Department of Physics Nantong UniversityNantong 226019China School of Information Science and Technology Nantong UniversityNantong 226019China

We consider the problem of electrical properties of an m×n cylindrical network with two arbitrary boundaries,which contains multiple topological network models such as the regular cylindrical network,cobweb network,globe network,and so *** deduce three new and concise analytical formulae of potential and equivalent resistance for the complex network of cylinders by using the RT-V method(a recursion-transform method based on node potentials).To illustrate the multiplicity of the results we give a series of special ***,the results obtained from the resistance formulas of cobweb network and globe network obtained are different from the results of previous studies,which indicates that our research work creates new research ideas and *** a byproduct of the study,a new mathematical identity is discovered in the comparative study.

关键词： cylindrical network complex boundaries RT-V method electrical properties Laplace equation