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Impact of parasitic resistance on the ESD robustness of high-voltage devices

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Journal of Semiconductors 2012年第1期33卷 59-63页

作者： lin Lijuan jiang lingli fan Hang Zhang Bo State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology Chengdu 610054China

The impacts ofsubstrate parasitic resistance and drain ballast resistance on electrostatic discharge （ESD） robustness of LDMOS are analyzed. By increasing the two parasitic resistances, the ESD robustness of LDMOS are significantly improved. The proposed structures have been successfully verified in a 0.35μm BCD process without using additional process steps. Experimental results show that the second breakdown current of the optimal structure increases to 3,5 A, which is about 367% of the original device.

关键词： electrostatic discharge high-voltage device LDMOS parasitic resistance

Detailed analysis of fan-shaped jets in three dimensional numerical simulation

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Research in Astronomy and Astrophysics 2011年第6期11卷 701-724页

作者： Rong-lin jiang K.Shibata H.Isobe Cheng fang Department of Astronomy Nanjing UniversityNanjing 210093China Kwasan and Hida Observatories Kyoto UniversityYamashinaKyoto 607-8471Japan Unit of Synergetic Studies for Space Kyoto UniversityYamashinaKyoto 607－8471Japan Key Laboratory of Modern Astronomy and Astrophysics（Nanjing University） Ministry of EducationNanjing 210093China

We performed three dimensional resistive magnetohydrodynamic simulations to study the magnetic reconnection using an initially shearing magnetic field configuration（force free field with a current sheet in the middle of the computational box）.It is shown that there are two types of reconnection jets：the ordinary reconnection jets and fan-shaped jets,which are formed along the guide magnetic *** fan-shaped jets are significantly different from the ordinary reconnection jets which are ejected by magnetic tension *** are two driving forces for accelerating the fan-shaped *** is the Lorentz force which initially dominates the motion of fluid elements,and then the gas pressure gradient force accelerates the fluid elements in the later *** dependence on magnetic reconnection angle and resistivity value has also been *** formation and evolution of these jets provide a new understanding of dynamic magnetohydrodynamic jets.

关键词： magnetohydrodynamics MHD-methods numerical

Response of Yesso scallop Patinopecten yessoensis to acute temperature challenge: physiological and biochemical parameters

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Journal of Oceanology and Limnology 2019年第1期37卷 321-329页

作者： jiang Weiwei DU Meirong fanG jianguang GAO Yaping MAO Yuze CHEN Qionglin lin fan jiang Zengjie Key Laboratory of Sustainable Development of Marine Fisheries Ministry of Agriculture Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and Technology

Water temperature is generally considered to be a major factor af fecting the physiological and biochemical activities of marine bivalves. Here, the physiological and biochemical responses of Yesso scallop, Patinopecten yessoensis, to acute water temperature changes in summer were studied. Scallops were transferred directly to a lower temperature( T dec treatment)(from 23°C to 15°C) or to a higher temperature( Ti nc treatment)(from 15°C to 23°C) for 72 h, respectively. Results showed that the oxygen consumption and ammonia-N excretion rates of P. yessoensis decreased signi?cantly in the T dec treatment but increased dramatically at 6 h in the Ti nc treatment( P <0.05). In the T dec treatment, hepatopancreas antioxidant enzyme activities, superoxide dismutase(SOD) and catalase(CAT) activities, increased substantially within 72 h( P <0.05). However, a signi?cant decrease in CAT activity was found at 12 h in the Ti nc treatment( P <0.01).A signi?cant enhancement of acid phosphatase(ACP) activity and malondialdehyde(MDA) content was detected when scallops were acutely exposed to a temperature of 15°C. The levels of Cu/Zn-SOD gene expression in their gills up-regulated signi?cantly in response to acute temperature changes( P <0.01). These data suggest that acute temperature change af fects physiological and biochemical functions, and improve our knowledge of P. yessoensis under conditions of thermal stress.

关键词： Patinopecten yessoensis acute water temperature changes physiology biochemical activities

Timing issues in distributed testing

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 522-528页

作者： HUANG Chuan-dong jiang fan Department of Computer Science University of Science and Technology of China Hefei 230027 China

The objective of conformance testing is to determine whether an implementation under test (IUT) conforms to its specification. In distributed test architecture where there are multiple remote testers, the objective can be complicated by the fact that testers may encounter controllability and observability problems during the application of a test sequence. A certain amount of work has been done in the area of generating test sequence that is free from these problems. However, few researchers investigate them from the aspect of test execution. This work studies the test execution phase when test sequences are applied to the imple- mentation and it is pointed out that controllability and observability problems can be resolved if and only if the test system im- plements some timing constraints. When determining these constraints, the dynamic time information during test is taken into account, which reduces the test execution time and improves test efficiency further.

关键词： Conformance testing Distributed system Controllability Observability Reaction time

PROCESS CONTROL OF THE SAND WAVE MIGRATION IN BEIBU GULF OF THE SOUTH CHINA SEA

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Journal of Hydrodynamics 2011年第4期23卷 439-446页

作者： LI yong lin Mian jiang Wen-bing fan Feng-xin Institute of Mechanics Chinese Academy of Sciences Beij ing 100190 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China

Based on the environment characteristics of the Beibu Gulf of South China Sea, a quasi-three-dimensional physical model is built. By coupling the bottom boundary layer with the two-dimensional tidal current field near the seabed surface, the quasi-three-dimensional hydrodynamic numerical simulation is carried out. The sand wave migration process is dealt with by coupling the hydrodynamic model with the sediment transport model. The computational results are shown to be in good agreement with the observed data, which indicates that the quasi-three-dimensional physical model can be used to simulate the migration process for small scale sand waves. Then, based on measured data, the evolution of the sand wave migration is investigated. An effective formula is developed to predict the migration rate, in which not only the effects of the environment but also the features of sand waves are considered.

关键词： small scale sand wave sand wave migration quasi-three-dimensional physical model numerical simulation in-situ measurement

Experimental Study on Wire Melting Control Ability of Twin-Body Plasma Arc

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 184-194页

作者： Ruiying Zhang fan jiang Long Xue School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Beijing Academy of Safety Engineering and Technology Beijing 102617China College of Mechanical and Energy Engineering Beijing University of TechnologyBeijing 100124China

The twin-body plasma arc has the decoupling control ability of heat transfer and mass transfer,which is beneficial to shape and property control in wire arc additive *** this paper,with the wire feeding speed as a characteristic quantity,the wire melting control ability of twin-body plasma arc was studied by adjusting the current separation ratio(under the condition of a constant total current),the wire current/main current and the position of the wire in the arc axial *** results showed that under the premise that the total current remains unchanged(100 A),as the current separation ratio increased,the middle and minimum melting amounts increased approximately synchronously under the effect of anode effect power,the first melting mass range remained constant;the maximum melting amount increased twice as fast as the middle melting amount under the effect of the wire feeding speed,and the second melting mass range was *** the wire current increased,the anode effect power and the plasma arc power were both factors causing the increase in the wire melting amount;however,when the main current increased,the plasma arc power was the only factor causing the increase in the wire melting *** average wire melting increment caused by the anode effect power was approximately 2.7 times that caused by the plasma arc *** minimum melting amount was not affected by the wire-torch distance under any current separation ratio *** the current separation ratio increased and reached a threshold,the middle melting amount remained constant with increasing wire-torch *** the current separation ratio continued to increase and reached the next threshold,the maximum melting amount remained constant with the increasing wire-torch *** effect of the wire-torch distance on the wire melting amount reduced with the increase in the current separation *** this study,the decoupling mechanism and ability of this innovative

关键词： Twin-body plasma arc Melting control ability Melting amount Current separation ratio

Oil Film Stiffness of Double Involute Gears Based on Thermal EHL Theory

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Chinese Journal of Mechanical Engineering 2021年第3期34卷 256-271页

作者： Zhaoming Yin Zhimin fan Feng jiang College of Electromechanical Engineering Qingdao University of Science&TechnologyQingdao 266061China

Lubrication failure is one of the main failure forms of gear *** varying meshing stiffness is an important factor affecting the dynamic behavior of ***,the influence of oil film stiffness is usually ignored in the research *** this paper,according to the meshing characteristics of double involute gears,based on the non-Newtonian thermal EHL theory,a new calculation method of normal and tangential oil film stiffness for double involute gears is established by the idea of subsection *** oil film stiffness difference between double involute gears and common involute gears is analyzed,and the influence of tooth waist order parameters,working conditions,and thermal effect on the oil film stiffness are *** results reveal that there are some differences between normal and tangential oil film stiffness between double involute gears and common involute gears,but there is little *** with the torque,rotation speed and initial viscosity of the lubricating oil,the tooth waist order parameters have less influence on the oil film *** effect has a certain influence on normal and tangential oil film stiffness,which indicates that the influence of thermal effect on the oil film can not be *** research proposes a calculation method of normal and tangential oil film stiffness suitable for double involute gears,which provides a theoretical basis for improving the stability of the transmission.

关键词： Double involute gear(DIG) Elastohydrodynamic lubrication(EHL) Oil film stiffness Thermal effect

Hybrid Mapping Method:from Human to Robotic Hands with Dissimilar Kinematics

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Journal of Bionic Engineering 2022年第4期19卷 935-952页

作者： Bingchen Liu Li jiang Shaowei fan State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150080China

Mapping grasps from human to anthropomorphic robotic hands is an open issue in research,because the master hand and the slave hand have dissimilar *** paper proposes a hybrid mapping method to solve this *** the proposed method,fingers in the master and the slave hands are divided into vital and synergic fingers according to their contribution to the grasping *** tip of the vital finger of the master hand is first mapped to that of the slave hand while ensuring that both are in simultaneous contact with the object to be *** postural synergy theory,joints of the other synergic fingers of the slave hand are then used to generate an anthropomorphic grasping configuration according to the shape of the object to be *** this,a human-guided impedance controller is used to reduce the pre-grasping error and realize compliant interaction with the *** proposed hybrid mapping method can not only generate the posture of the humanoid envelope but can also carry out impedance-adaptive *** was evaluated using simulations and an experiment involving an anthropomorphic robotic slave hand.

关键词： Robotic hand Human-in-the-loop Grasping Postural synergy Impedance control

Input-Output Production Structure and Non-linear Production Possibility Frontier

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Journal of Systems Science & Complexity 2021年第2期34卷 706-723页

作者： jiang Weimin fan Jin TIAN Kailan College of Economics and Management Nanjing Forestry UniversityNanjing 210037China

Input-output(Leontief)production function is widely used in economic *** diminishing marginal rate of return is a very well accepted economic *** production function normally results in a linear production possibility frontier(PPF)due to its linear feature,whereas diminishing marginal rate of return implies a non-linear *** this paper,the authors aim to fix this problem by considering multiple primary inputs in a simplified two-sector *** authors find that it is possible to curve a non-linear PPF by using Leontief production function when the authors add heterogeneous primary *** authors also discuss the PPF using non-linear production ***,the authors propose that three commonly used economic presumptions cannot hold in the same *** presumptions are"single primary input","fixed-proportion inputs"and"law of diminishing marginal returns".

关键词： Input output analysis marginal rate of transformation non-substitution theorem production possibility frontier