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Analysis of single-event transient sensitivity in fully depleted silicon-on-insulator MOSFETs

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Nuclear Science and Techniques 2018年第4期29卷 108-113页

作者： Jing-Yan xu Shu-Ming Chen Rui-qiang Song zhen-Yu Wu Jian-Jun Chen College of Computer National University of Defense Technology National Laboratory for Parallel and Distributed Processing National University of Defense Technology

Based on 3 D-TCAD simulations, single-event transient(SET) effects and charge collection mechanisms in fully depleted silicon-on-insulator(FDSOI) transistors are investigated. This work presents a comparison between28-nm technology and 0.2-lm technology to analyze the impact of strike location on SET sensitivity in FDSOI devices. Simulation results show that the most SET-sensitive region in FDSOI transistors is the drain region near the gate. An in-depth analysis shows that the bipolar amplification effect in FDSOI devices is dependent on the strike locations. In addition, when the drain contact is moved toward the drain direction, the most sensitive region drifts toward the drain and collects more charge. This provides theoretical guidance for SET hardening.

关键词： Single-event transient Charge collection Bipolar amplification Fully depleted silicon-on-insulator

Feedforward compensation of the insertion devices effects in the SSRF storage ring

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Nuclear Science and Techniques 2022年第6期33卷 34-44页

作者： Xin-Zhong Liu Shun-qiang Tian xu Wu Meng Wang zhen-Tang Zhao Bo-Yuan Feng University of Chinese Academy of Sciences Shanghai 201800China Shanghai Institute of Applied Physics Chinese Academy of SciencesBeijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Shanghai University Shanghai 200444China Tsinghua University Beijing 100084China

The lattice of the Shanghai Synchrotron Radiation Facility(SSRF) storage ring was upgraded in the Phase-II beamline project, and thus far, 18 insertion devices(IDs) have been installed. The IDs cause closed-orbit distortions, tune drift, and coupling distortions in the SSRF storage ring, all of which are significant issues that require solutions. In this study, an ID orbit feedforward compensation system based on a response matrix using corrector coils was developed, and it was applied to all commissioned IDs in the SSRF storage ring. After correction, the maximum ID-induced horizontal and vertical orbit distortions were less than 5.0 and 3.5 μm, respectively. Some interesting phenomena observed during the measurement process were explained. Additionally, optical and coupling feedforward systems were developed using quadrupole and skew quadrupole magnets installed on the front and back of elliptically polarizing undulators(EPUs). Moreover, over nearly four months of operation, the developed strategy delivered a satisfactory performance in the SSRF storage ring.

关键词： Shanghai Synchrotron Radiation Facility(SSRF) Insertion devices(IDs) Closed-orbit distortion Tune shift Coupling Feedforward

Influence of filler characteristics on particle removal in fluid catalytic cracking slurry under an alternating electric field

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Petroleum Science 2024年第3期21卷 2102-2111页

作者： qiang Li Hui-zhen Yang Can Yang Qing-Zhu Qiu Wei-Wei xu Zhao-Zeng Liu College of New Energy China University of Petroleum(East China)Qingdao266580ShandongChina

The characteristics of the packing material under an alternating electric field are an important factor in the removal of FCCS *** this study,the electric field distribution of a separation unit consisting of packed spheres under an alternating electric field is simulated,and the movement mechanism of catalyst particles is ***"effective contact point"model is derived to predict the adsorption of filler contact points on catalyst particles under the alternating electric field,and the model is validated by simulations and *** numerical calculation and experimental results indicate that the electrical properties of the filler spheres,the filler angleθ,and the frequency f of the alternating electric field affect the adsorption of catalyst *** the frequency of the electric field increases,the particle removal efficiency of the high-conductivity filler(silicon carbide)increases and then settles,and the separation efficiency of the low-conductivity filler(glass,zirconia)is not sensitive to the change in electric field frequency.

关键词： Fluid catalyticcracking slurry(FCCS) Particle AC electric field Fillers Removal

Multitemporal UAV-based photogrammetry for landslide detection and monitoring in a large area:a case study in the Heifangtai terrace in the Loess Plateau of China

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Journal of Mountain Science 2020年第8期17卷 1826-1839页

作者： xu qiang LI Wei-le JU Yuan-zhen DONG Xiu-jun PENG Da-lei State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China

With high spatial resolution,on-demand-flying ability,and the capacity for obtaining threedimensional measurements,unmanned aerial vehicle(UAV)photogrammetry is widely used for detailed investigations of single landslides,but its effectiveness for landslide detection and monitoring in a large area needs to be *** Heifangtai terrace in the Loess Plateau of China is a loess terrace that is extremely susceptible to irrigation-induced loess *** paper used UAV-based photogrammetry for a series of highresolution images spanning over 30 months for landslide detection and monitoring of the terrace with an area of 32 km^*** and evenly distributed ground control points were established and measured to ensure the high accuracy of the photogrammetry *** structure-from-motion(Sf M)technique was used to convert overlapping images into orthographic images,3D point clouds,digital surface models(DSMs)and mesh *** multitemporal differential mesh models,landslide vertical movements and potential landslides were detected and *** results indicate that a combination of UAV-based orthophotos and differential mesh models can be used for flexible and accurate detection and monitoring of potential loess landslides in a large area.

关键词： Unmanned Aerial Vehicle Loess Plateau Landslide detection Landslide monitoring Differential mesh model Vertical movement

A COST-SHARING METHOD FOR AN UNCAPACITATED FACILITY LOCATION GAME WITH PENALTIES

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Journal of Systems Science & Complexity 2012年第2期25卷 287-292页

作者： zhen WANG Dachuan xu Department of Applied Mathematics Beijing University of Technology

This paper considers a variant of the classical facility location game called the uncapacitared facility location game with penalties （UFLGWP）. Unlike the standard UFLG, each client in the UFLGWP is either assigned to an open facility or rejected by paying a penalty. The authors propose a 3-approximate cross-monotonic cost-sharing method for the UFLGWP.

关键词： Cost-sharing method cross-monotonicity facility location game.

Development of optical nanoprobes for molecular imaging of reactive oxygen and nitrogen species

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Nano Research 2018年第10期11卷 5258-5280页

作者： xu zhen Kanyi Pu School of Chemical and Biomedical Engineering Nanyang Technological University Singapore 637457 Singapore

Reactive oxygen and nitrogen species （RONS） play important roles in cell signal transduction. However, overproduction of RONS is associated with a series of pathological processes and may disrupt cellular homeostasis, causing oxidative and nitrosative stress. Accurate methods to selectively and specifically monitor RONS in living systems are required to further elucidate the biological functions of these species. Optical imaging possesses high sensitivity, high spatiotemporal resolution, and real-time imaging capability. These qualities are advantageous for the detection of RONS in living systems. This review summarizes the development of optical nanoprobes with near-infrared （NIR） fluorescent, upconversion luminescent, chemiluminescent, or photoacoustic signals for molecular imaging of RONS in living systems. In this review, we discuss the design principles and advantages of RONS-responsive activatable nanoprobes, as well as applications of these optical imaging modalities in different disease models.

关键词： optical imaging reactive oxygen andnitrogen species fluorescent upconversion luminescence chemiluminescence photoacoustic imaging

Bio-inspired motion planning for reaching movement of a manipulator based on intrinsic tau jerk guidance

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Advances in Manufacturing 2019年第3期7卷 315-325页

作者： zhen Zhang xu Yang School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People's Republic of China

This study proposed a bio-inspired motion planning approach for the reaching movement of a robot manipulator based on a novel intrinsic tau jerk guidance strategy,which was established by some cognitive science researchers when they studied motion patterns through *** accordance with the rules of human reaching movement,the intrinsic tau jerk guidance strategy ensures continuity of the acceleration;further,it also ensures that its value is zero at the start and end of the *** approach has been implemented on a three-degrees-offreedom 3R planar *** results show that,within a defined time,both the position gap and attitude gap can be reposefully closed,and the curves of joint velocity,acceleration,and driving torque are continuous and *** to the dynamic analysis,the proposed approach tends to consume less *** bioinspired method has the potential to be applied in particular scenarios in the future,such as a mobile robot with a manipulator exploring an unknown environment.

关键词： Bio-inspired Motion planning Manipulator Reaching movement Intrinsic tau jerk guidance

Effects of the properties of FCCS on the removing of catalyst particles from FCCS under a DC electrostatic field

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Petroleum Science 2023年第3期20卷 1885-1894页

作者： qiang Li Qing-Zhu Qiu Hao Cao Hui-zhen Yang Wei-Wei xu Zhao-Zeng Liu College of New Energy China University of Petroleum(East China)QingdaoShandong 266580China

Catalytic cracking is the main method to lighten heavy crude oil,this process can produce high quality oil products such as gasoline and diesel,but also produces a large amount of fluid catalytic cracking slurry(FCCS).The catalyst particles in FCCS seriously restrict the secondary processing of FCCS and need to be removed,and the properties of Fccs is an important factor that affects the removal efficiency of the catalyst *** on the"effective contact point"model proposed by the research group,this study further proposed the"electrostatic separation efficiency calculation"*** this model,since Fccs has a uniform distribution of catalyst particles,the ratio of the number of catalyst particles can be expressed as the ratio of area to achieve the calculation of separation *** the catalyst removal efficiency under different viscosity was analyzed,thus verifying the feasibility of this *** effects of temperature and mass ratio of four components on the viscosity of FccS were investigated respectively,then the effects of temperature and four components'mass ratio on the electrostatic sep-aration can be directly converted into the effect of viscosity on the electrostatic separation *** the results show the electrostatic separation efficiency decreases with increasing viscosity,and the best separationtemperatureis120℃.

关键词： Fluid catalytic cracking slurry(FCCS) Separation efficiency Viscosity Temperature Four components'mass ratio

PID Neural Net work Decoupling Control Based on Hybrid Particle Swarm Optimization and Differential Evolution

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International Journal of Automation and computing 2020年第6期17卷 867-872页

作者： Hong-Tao Ye zhen-qiang Li School of Electrical and Information Engineering Guangxi University of Science and TechnologyLiuzhou 545006China Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and TechnologyLiuzhou 545006China

For complex systems with high nonlinearity and strong coupling,the decoupling control technology based on proportion integration differentiation(PID)neural network(PIDNN)is used to eliminate the coupling between *** connection weights of the PIDNN are easy to fall into local optimum due to the use of the gradient descent learning *** order to solve this problem,a hybrid particle swarm optimization(PSO)and differential evolution(DE)algorithm(PSO-DE)is proposed for optimizing the connection weights of the *** DE algorithm is employed as an acceleration operation to help the swarm to get out of local optima traps in case that the optimal result has not been improved after several *** multivariable controlled plants with strong coupling between input and output pairs are employed to demonstrate the effectiveness of the proposed *** results show t hat the proposed met hod has better decoupling capabilities and control quality than the previous approaches.

关键词： Particle swarm optimization differential evolution proportion integration differentiation(PID)neural network hybrid approach decoupling control.