检索结果-南通市图书馆

Drag Effects of Solute and Second Phase Distributions on the Grain Growth Kinetics of Pre-Extruded Mg-6Zn Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第12期32卷 1260-1266页

作者： Zhaoyang Jin Donghua Yu Xintong Wu kai yin kai Yan College of Mechanical Engineering Yangzhou University

In order to control the grain size during hot forming,grain growth behavior of a pre-extruded Mg-6Zn magnesium alloy and its correlation with solute and second phase distribution were *** annealing was conducted on a Gleeble-1500 thermo-mechanical *** mean grain size Dg of each annealed specimen was measured by the quantitative metallography *** grain growth kinetics of the Mg-6Zn alloy annealed at 473-623 K was obtained as Dg^4- Dg0^4=2.25 ×10^11 exp（-95450）by the least square linear regression *** deviation of grain growth exponent n = 4 from the theoretical value of 2 may be attributed to the presence of solute zinc and second phases which will retard the boundary *** observations show that the non-uniform distribution of grain size for samples pre-extruded or annealed at low temperatures is closely related to the non-uniform distribution of fine and dispersed second phases but not to the non-uniform distribution of solute *** indicates that second phase pinning effect plays an important role in microstructure refinement.

关键词： Grain growth kinetics Second phase distribution Solute dragging Magnesium alloys

Challenges to quantitative applications of Landsat observations for the urban thermal environment

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第9期29卷 80-88页

作者： Feng Chen Song Yang kai yin Paul Chan School of Atmospheric Sciences Sun Yat-sen UniversityZhuhai 519082China Institute of Earth Climate and Environment System Sun Yat-sen UniversityOuangzhou 510275China Fujian Key Laboratory of Sensing and Computing.for Smart City Xiarnen UniversityXiarnen 361005China Institute of Remote Sensing and Digital Earth Chinese Academy of SciencesBeijing 10094China Climate Decision LLC BethesdaMDUSA

Since the launch of its first satellite in 1972, the Landsat program has operated continuously for more than forty years. A large data archive collected by the Landsat program significantly benefits both the academic community and society. Thermal imagery from Landsat sensors, provided with relatively high spatial resolution, is suitable for monitoring urban thermal environment. Growing use of Landsat data in monitoring urban thermal environment is demonstrated by increasing publications on this subject, especially over the last decade. Urban thermal environment is usually delineated by land surface temperature（LST）. However, the quantitative and accurate estimation of LST from Landsat data is still a challenge, especially for urban areas. This paper will discuss the main challenges for urban LST retrieval, including urban surface emissivity, atmospheric correction, radiometric calibration, and validation. In addition, we will discuss general challenges confronting the continuity of quantitative applications of Landsat observations. These challenges arise mainly from the scan line corrector failure of the Landsat 7 ETM ＋ and channel differences among sensors. Based on these investigations, the concerns are to：（1） show general users the limitation and possible uncertainty of the retrieved urban LST from the single thermal channel of Landsat sensors;（2） emphasize efforts which should be done for the quantitative applications of Landsat data; and（3） understand the potential challenges for the continuity of Landsat observation（i.e., thermal infrared） for global change monitoring, while several climate data record programs being in progress.

关键词： Remote sensing Radiometric calibration SLC-off Surface temperature Data consistency

Finite element modelling on microstructure evolution during multi-pass hot compression for AZ31 alloys using incremental method

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第11期33卷 1255-1262页

作者： Zhaoyang Jin kai yin kai Yan Defeng Wu Juan Liu Zhenshan Cui School of Mechanical Engineering Yangzhou University Yangzhou 225127 China School of Chemistry & Chemical Engineering Yangzhou University Yangzhou 225127 China Nationai Die and Mold CAD Engineering Research Center Shanghaifiao Tong University Shanghai 200030 China

Based on the principle of piecewise linearization, the incremental forms of microstructure evolution models were integrated into the thermo-mechanical coupled finite element（FE） model to simulate nonlinear microstructure evolution during multi-pass hot deformation. This is an unsteady-state deformation where dynamic recrystallization（DRX）, meta-dynamic recrystallization（MDRX）, static recrystallization（SRX） and grain growth（GG） take place during hot deformation or deformation interval. The distributions of deformation and microstructure for cylindrical AZ31 sample during single-pass and double-pass hot compressions were quantitatively calculated and compared with the metallographic observation. It is shown that both the deformation and microstructure are non-uniformly distributed due to the presence of friction between the die and the flat end of sample. The average grain size and its standard deviation under the double-pass hot compression are slightly smaller than those under single-pass *** simulated average grain sizes agree well with the experiments, which validates that the developed FE model on the basis of incremental forms of microstructure evolution models is reasonable.

关键词： Incremental method Microstructure evolution Multi-pass hot compression Finite element method Magnesium alloys

Inflammation,lipid metabolism dysfunction,and hypertension:Active research fields in atherosclerosis-related cardiovascular disease in China

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2011年第10期54卷 976-979页

作者： yin kai TANG ChaoKe Institute of Cardiovascular Research Key LaboratoryJbr Atherosclerology of Hunan Province Life Science Research Center University of South China Hengyang 421001 China

Atherosclerosis-related cardiovascular disease is one of the leading causes of death in China [1]. With advances in our understanding of the molecular mechanisms of atherosclerosis vascular inflammation, lipid metabolism dysfunction, and hypertension are regarded as the main pathogenetic pathways of both early atherogenesis and advanced plaque rupture [2,3]. Currently, much attention is being paid to the control of these pathways, which offers the potential for development of novel therapeutic approaches in the treatment of cardiovascular disease in China.

关键词：动脉粥样硬化心血管疾病高血压功能障碍脂质代谢中国炎症分子机制

Sensing as the key to the safety and sustainability of new energy storage devices

在线全文

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2023年第2期8卷 185-206页

作者： Zhenxiao Yi Zhaoliang Chen kai yin Licheng Wang kai Wang School of Electrical Engineering Weihai Innovation Research InstituteQingdao UniversityQingdao 266000China Qingdao No.2 Middle School Qingdao 266199China Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Information Engineering Zhejiang University of TechnologyHangzhou 310014China

New energy storage devices such as batteries and supercapacitors are widely used in various fields because of their irreplaceable excellent *** there are relatively few monitoring parameters and limited under-standing of their operation,they present problems in accurately predicting their state and controlling operation,such as state of charge,state of health,and early failure *** monitoring can seriously affect the performance of energy storage ***,to maximize the efficiency of new energy storage devices without damaging the equipment,it is important to make full use of sensing systems to accurately monitor important parameters such as voltage,current,temperature,and *** are highly related to their ***,this paper reviews the sensing methods and divides them into two categories:embedded and non-embedded sensors.A variety of measurement methods used to measure the above parameters of various new energy storage devices such as batteries and super-capacitors are systematically *** methods with different innovative points are listed,their advantages and disadvantages are summarized,and the application of optical fiber sensors is ***,the challenges and prospects for these studies are *** intent is to encourage researchers in relevant fields to study the early warning of safety accidents from the root causes.

关键词： New energy storage devices Battery Supercapacitor Embedded sensors Non-embedded sensors Sensing

Bionic Mechanism and Kinematics Analysis of Hopping Robot Inspired by Locust Jumping

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 Bionic Engineering 2011年第4期8卷 429-439页

作者： Diansheng Chen Junmao yin kai Zhao Wanjun Zheng Tianmiao Wang Robotic Institute Beihang University Beijing 100191 P. R. China

A flexible-rigid hopping mechanism which is inspired by the locust jumping was proposed, and its kinematic characteris- tics were analyzed. A series of experiments were conducted to observe locust morphology and jumping process. According to classic mechanics, the jumping process analysis was conducted to build the relationship of the locust jumping parameters. The take-offphase was divided into four stages in detail. Based on the biological observation and kinematics analysis, a mechanical model was proposed to simulate locust jumping. The forces of the flexible-rigid hopping mechanism at each stage were ana- lyzed. The kinematic analysis using pseudo-rigid-body model was described by D-H method. It is confirmed that the proposed bionic mechanism has the similar performance as the locust hind leg in hopping. Moreover, the jumping angle which decides the jumping process was discussed, and its relation with other parameters was established. A calculation case analysis corroborated the method. The results of this paper show that the proposed bionic mechanism which is inspired by the locust hind limb has an excellent kinematics performance, which can provide a foundation for design and motion planning of the hopping robot.

关键词： hopping robot flexible-rigid mechanism bionic mechanism kinematics

Integrated energy storage system based on triboelectric nanogenerator in electronic devices

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

Frontiers of Chemical Science and Engineering 2021年第2期15卷 238-250页

作者： Xiao Feng Yang Zhang Le Kang Licheng Wang Chongxiong Duan kai yin Jinbo Pang kai Wang School of Electrical Engineering Qingdao UniversityQingdao 266071China Department of Energy“Galileo Ferraris” Politecnico di TorinoTurin 10129Italy School of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China School of Information Engineering Zhejiang University of TechnologyHangzhou 310023China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528231China Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410012China Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(iAIR)University of JinanJinan 250022China

The emergence of electronic devices has brought earth-shaking changes to people's ***,an extemal power source may become indispensable to the electronie devices due to the limited capacity of *** one of the possible solutions for the extermal power sources,the triboelectric nanogenerator(TENG)provides a novel idea to the increasing mumber of personal electronic *** is a new type of energy ollector,which has become a hot spot in the field of *** is widely used at the acquisition and conversion of mechan-ical enegy to electrice energy through the principle of electrostatic *** this basis,the TENG could be integrated with the energy stonage system into a self-powered system,W hich can supply power to the electronic devices and make them work *** this review,TENG's basic structure as well as its working process and working mode are firstly *** integration method of TENGs with enegy storage systems and the related research status are then introduced in *** the end of this paper,we put forward some problems and discuss the prospect in the future.

关键词： electronic devices triboelectrice nanogenerator mechanical energy sel-powered system

Therapeutic advances: Single incision laparoscopic hepatopancreatobiliary surgery

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第39期20卷 14329-14337页

作者： Stephen Kin Yong Chang kai yin Lee Division of Hepatobiliary and Pancreas Surgery Department of Surgery National University Singapore Hospital

Single-port laparoscopic surgery(SPLS) is proposed to be a step towards minimizing the invasiveness of surgery, and has since gained popularity in several surgical sub-specialties including hepatopancreatobiliary surgery. SPLS has since been applied to cholecystectomy, liver resection as well as pancreatectomy for a multitude of pathologies. Benefits of SPLS over conventional multi-incision laparoscopic surgery include improved cosmesis and potentially post-operative pain at specific time periods and extra-umbilical sites. However, it is also associated with longer operating time, increased rate of complications, and increased rate of port-site hernia. There is no significant difference between length of hospital stay. SPLS has a significant learning curve that affects operating time, rate of conversion and rate of complications. In this article, we review the literature on SPLS in hepatobiliary surgery- cholecystectomy, hepatectomy and pancreatectomy, and offer tips on overcoming potential technical obstacles and minimizing the complications when performing SPLS- surgeon position, position of port and instruments, instrument crossing position, standard hand grip vs reverse hand grip, snooker cue guide position, prevention of incisional hernia. SPLS is a promising direction in laparoscopic surgery, and we recommend step-wise progression of applications of SPLS to various hepatopancreatobiliary surgeries to ensure safe adoption of the surgical technique.

关键词： Single port laparoscopic Cholecystectomy Hepatectomy Pancreatectomy Liver resection

Preface to the special issue on laser processing and micro-nano technology

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 Central South University 2022年第10期29卷 3201-3202页

作者： HONG Ming-hui WANG Guo-an HE Jun yin kai National University of Singapore University of South Carolina Central South University

In 2022, coinciding with the 20th anniversary of the School of Physics and Electronics at Central South University, we plan to publish the special issue “Laser processing and micro-nano technology” in the Journal of Central South University, which aims to commemorate the 20th anniversary of the school and comprehensively present the latest achievement in the fields of laser processing and micro-nano technology to domestic and foreign universities.

关键词： laser technology processing