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High-power microwaves response characteristics of silicon and GaAs solar cells

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Journal of Semiconductors 2022年第11期43卷 54-60页

作者： Xiangrui Meng Changchun Chai Fuxing Li Yi Sun Yintang Yang Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory Xidian UniversityXi’an 710071China

The high-power microwave(HPM)effect heats solar cells,which is an important component of a *** creates a serious reliability problem and affects the normal operation of a *** this paper,the different HPM response characteristics of two kinds of solar cells are comparatively researched by *** results show that there are similarities and differences in hot spot distribution and damage mechanisms between both kinds of solar cell,which are related to the amplitude of *** addition,the duty cycle of repetition frequency contributes more to the temperature accumulation of the solar cells than the carrier *** results will help future research of damage assessment technology,reliability enhancement and the selection of materials for solar cells.

关键词： solar cells silicon GaAs HPM repetition frequency response characteristics

Application of complex nonlinear modes to determine dry whip motion in a rubbing rotor system

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Chinese Journal of Aeronautics 2021年第1期34卷 209-225页

作者： Pingchao YU Yanhong MA Jie HONG Guo CHEN College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Energy and Power Engineering Beihang UniversityBeijing 100083China Collaborative Innovation Center of Achanceci Aero-Engine Beihang UniversityBeijing 100083China

Dry whip motion is an instability of rubbing rotor system and may cause catastrophic failures of rotating *** to now,the related mechanisms of the dry whip is still not well *** paper aims to build the relationship between the complex nonlinear modes and the dry whip motion,and propose an effective method to predict the response characteristics and existence boundary of the dry whip through complex nonlinear *** the first time,the paper discusses how to use the complex nonlinear modes to predict the dry whip systematically,and as a consequence,the mechanism of the relationship between the complex nonlinear mode and the dry whip is *** results show that the Backward Whirl(BW)mode motion of the rubbing rotor system dominates the response characteristics and the existence boundary of dry *** whirl amplitude and whirl frequency of dry whip are equal to the modal amplitude and modal frequency of the BW mode at the jump up point where the modal damping is equal to *** existence boundary corresponds to the critical rotation speed where the minimum of the modal damping of the BW mode motion is exactly equal to ***,the proposed nonlinear modal method in this article is very effective for the prediction of dry whip of the more complicated practical rotor system,which has been verified by applying the predicted method into a rubbing rotor test rig.

关键词： Complex nonlinear mode Dry whip Existence boundary response characteristics

Hybrid Control Strategy for Air-conditioning Loads Participating in Peak Load Reduction Through Wide-range Transport Model

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1542-1551页

作者： Yunfeng Ma Zengqiang Mi Ruifeng Zhang Huowen Peng Yulong Jia School of Electrical&Electronic Engineering North China Electric Power UniversityBeijingChina Department of Electrical Engineering North China Electric Power UniversityBaodingChina University of Edinburgh Old CollegeSouth BridgeEdinburghEH89YLUK Planning&Design Institute at State Grid Integrated Energy Services Group Co. Ltd.Beijing 100032China

This paper proposes a hybrid control strategy of air-conditioning loads(ACLs)for participating in peak load *** hybrid control strategy combines the temperature setpoint adjustment(TSA)control and on/off control together to make full use of response potentials of *** primary free transport model of ACLs has been established in literature at or near a fixed temperature *** this paper,a wide-range transport(WRT)model suitable for larger value of TSA is *** WRT model can be constructed easily through the parameter of devices and indoor and outdoor *** modulate the aggregate response characteristics of ACLs more friendly to the power grid,the safe protocol(SP)is adopted and integrated into the WRT model,which achieves a good unification of oscillation suppression and efficient ***,the hybrid control strategy is implemented based on the WRT model,and the model predictive control(MPC)controller is designed considering the tracking error and control switch *** last,the superiority of the hybrid control strategy is verified and the performance of ACLs for peak load reduction under this controller is *** simulation results show that the hybrid control strategy could exploit the load reduction potential of ACLs fully than the TSA mode and track the reference signal more accurately.

关键词： Peak load reduction air conditioning load aggregate modeling response characteristics state space model model predictive control

Temporal and spatial response of vegetation NDVI to temperature and precipitation in eastern China

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Journal of Geographical Sciences 2010年第2期20卷 163-176页

作者： CUI Linli SHI Jun Shanghai Center for Satellite Remote Sensing and Application Shanghai 201100 China Shanghai Climate Center Shanghai 200030 China

Temporal and spatial response characteristics of vegetation NDVI to the variation of temperature and precipitation in the whole year, spring, summer and autumn was analyzed from April 1998 to March 2008 based on the SPOT VGT-NDVI data and daily temperature and precipitation data from 205 meteorological stations in eastern China. The results indicate that as a whole, the response of vegetation NDVI to the variation of temperature is more pronounced than that of precipitation in eastern China. Vegetation NDVI maximally responds to the variation of temperature with a lag of about 10 days, and it maximally responds to the variation of precipitation with a lag of about 30 days. The response of vegetation NDVI to temperature and precipitation is most pronounced in autumn, and has the longest lag in summer. Spatially, the maximum response of vegetation NDVI to the variation of temperature is more pronounced in the northern and middle parts than in the southern part of eastern China. The maximum response of vegetation NDVI to the variation of precipitation is more pronounced in the northern part than in the middle and southern parts of eastern China. The response of vegetation NDVI to the variation of temperature has longer lag in the northern and southern parts than in the middle part of eastern China. The response of vegetation NDVl to the variation of precipitation has the longest lag in the southern part, and the shortest lag in the northern part of eastern China. The response of vegetation NDVI to the variation of temperature and precipitation in eastern China is mainly consistent with other results, but the lag time of vegetation NDVI to the variation of temperature and precipitation has some differences with those results of the monsoon region of eastern China.

关键词： SPOT VGT-NDVI temperature precipitation response characteristics lag time eastern China

The Characteristic Analysis of the Electromagnetic Valve in Opening and Closing Process for the Gas Injection System

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Journal of Electromagnetic Analysis and Applications 2016年第8期8卷 152-159页

作者： Linqian Yin Changshui Wu School of Automotive Engineering Shanghai University of Engineering Science Shanghai China

In this paper, the mathematical model of solenoid valve in the fuel injection system of gas engine is built. Simulation software Matlab/Simulink are employed to analyze the impact which the voltage, number of the coil turns and air gap width may produce to the open and close characteristics of the solenoid valve. The ideal response characteristics are got through the calculation. An optimal scheme which satisfies the operation requirements is put forward. The driving voltage and maintaining voltage are set as 90 V and 21 V;number of the coil turns is 30 N;air gap is determined as 0.6 mm;the opening and closing time are respectively 0.98 ms and 0.8 ms. This paper can be used as a reference for the design of the solenoid valve.

关键词： Solenoid Valve response characteristics Matlab/Simulink Fuel Injection System

Circuit-Level Analysis on Opto-Electronic characteristics of Ferroelectric Liquid Crystal

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Journal of Semiconductors 2007年第10期28卷 1523-1526页

作者：朱思奇中国科学院微电子研究所电子系统总体技术研究室北京100029

We propose an electronic model in Spice, instead of traditional mathematical analysis, for analyzing the performance of ferroelectric liquid crystal （FLC） under various working conditions. Using this equivalent circuit model,it is easy to simulate and analyze the behavior of an FLC layer in three different typical parameters,including temperature, input light wavelength, and the frequency of driving voltage. We conclude that the response velocity drops as the wavelength increases in the range of visible light, and for the parameter of temperature, the velocity reaches its lowest value when the temperature reaches a certain degree,meanwhile,the frequency of driving voltage exerts important effects on the response velocity only when the frequency is beyond a critical value. Excellent agreement is achieved between simulation and experimental results.

关键词： ferroelectric liquid crystal circuit-level analysis response characteristics typical parameters