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A SIMPLIFIED CALCULATING METHOD OF NONLINEAR FREQUENCY OF CABLE NET UNDER MEAN WIND LOAD

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Acta Mechanica Solida Sinica 2006年第3期19卷 248-254页

作者： Feng Ruoqiang Wu Yue shen Shizhao shen zhen Graduate School Harin Institute of Technology Shen zhen 518055 China Space Structure Research Center Harin Institute of Technology Harbin 150090 Chin）

The cable net supported glass curtain wallas the most advanced technique in dot point supported glass curtain wall, is widely used in China. Because of its large deflection and high nonlinearity under wind load, the dynamic performance of the cable net is greatly different from that of the conventional linear structures. The continuous membrane theory is used to construct the nonlinear vibration differential equation of the cable net, and the harmonic balance method is used to solve the analytic formula of the nonlinear frequency. In order to verify the accuracy of the above analytic formula, the results of the formula and the nonlinear FEM time-history method are compared and found to be in good agreement. Furthermore, the nonlinear vibration differential equation and the nonlinear frequency obtained in this paper are the basis for the wind-induced response analysis of a cable net under fluctuating wind load.

关键词： dot point supported glass curtain wall cable structure geometrically nonlinear,nonlinear vibration frequency

Pressure manipulation of ultrafast carrier dynamics in monolayer WS_(2)

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Journal of Semiconductors 2023年第8期44卷 35-40页

作者： Yao Li Haiou Zhu Zongpeng Song New Materials and New Energies Shen Zhen Technology UniversityShenzhen 518118China Analysis and Testing Center Shen Zhen Technology UniversityShenzhen 518118China

Two-dimensional transition metal dichalcogenides(TMDs)have intriguing physic properties and offer an exciting platform to explore many features that are important for future *** this work,we synthesized monolayer WS_(2)as an example to study the optical response with hydrostatic *** Raman results show a continuous tuning of the lattice vibrations that is induced by hydrostatic *** further demonstrate an efficient pressure-induced change of the band structure and carrier dynamics via transient absorption *** found that two time constants can be attributed to the capture process of two kinds of defect states,with the pressure increasing from 0.55 GPa to 2.91 GPa,both of capture processes were accelerated,and there is an inflection point within the pressure range of 1.56 GPa to 1.89 *** findings provide valuable information for the design of future optoelectronic devices.

关键词： two-dimensional transition metal dichalcogenides hydrostatic pressure carrier dynamics band structure ultrafast spectroscopy

Effect of Pressure on Microstructure and Mechanical Properties of AM60B Alloy Used for Motorcycle Wheels Formed by Double Control Forming

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Journal of Materials Science & Technology 2013年第5期29卷 439-445页

作者： Jufu Jiang Yuansheng Cheng Zhiming Du Jun Liu Yuanfa Li Shoujing Luo School of Materials Science and Engineering Harbin Institute of Technology Mg Technology(shen zhen) Co.Ltd.of Ka Shui Group

A set of novel forming die combining the advantages of dies casting and forging was designed, by which double control forming idea was firstly proposed. The motorcycle wheel made of AM60B alloy was used as the typical component to demonstrate advantages of the double control forming. The effect of pressure on the mechanical properties and microstructure of the parts formed by double control forming was investigated. The results showed that high mechanical properties and complex shape were achieved in the parts formed by double control forming. Compared to die casting, the mechanical properties of the formed part significantly increased and the microstructure changed from the coarse dendrites to fine equiaxed grains. The shrinkage voids and microcracks in the formed parts were obviously reduced or even completely eliminated with the increase of pressure. When a pressure of 4000 kN was applied, the optimal mechanical properties such as ultimate tensile strength of 265.6 MPa and elongation of 21% were achieved and the microstructure was characterized by fine and uniform equiaxed grains due to the large undercooling degree caused by the high pressure.

关键词： Die casting Forging Magnesium alloy

Joint Power-Trajectory-Scheduling Optimization in A Mobile UAV-Enabled Network via Alternating Iteration

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China Communications 2022年第1期19卷 136-152页

作者： Xiaohan Qi Minxin Yuan Qinyu Zhang Zhihua Yang Communications Engineering Research Center Harbin Institute of TechnologyShen zhen 518055China Peng Cheng Laboratory Shenzhen 518052China

This work focuses on an unmanned aerial vehicle(UAV)-enabled mobile edge computing(MEC) system based on device-to-device(D2D) communication. In this system, the UAV exhibits caching,computing and relaying capabilities to periodically provide specific service to cellular users and D2D receiver nodes in the appointed time slot. Besides, the D2D transmitter can provide additional caching services to D2D receiver to reduce the pressure of the UAV. Note that communication between multi-type nodes is mutually restricted and different links share spectrum resources. To achieve an improved balance between different types of node, we aim to maximize the overall energy efficiency while satisfying the quality-of-service requirements of the cellular *** address this problem, we propose an alternating iteration algorithm to jointly optimize the scheduling strategies of the user, transmitting power of the UAV and D2D-TX nodes, and UAV trajectory. The successive convex approximation, penalty function, and Dinkelbach method are employed to transform the original problem into a group of solvable subproblems and the convergence of the method is proved. Simulation results show that the proposed scheme performs better than other benchmark algorithms, particularly in terms of balancing the tradeoff between minimizing UAV energy consumption and maximizing throughput.

关键词： UAV MEC network D2D joint optimization energy efficiency

Optimal Time-of-use Pricing for Renewable Energy-powered Microgrids: A Multi-agent Evolutionary Game Theory-based Approach

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 162-174页

作者： Yu Zeng Yinliang Xu Xinwei shen Hongbin Sun tsinghua-berkeley shenzhen institute.tsinghua shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

While price schedules can help improve the economic efficiency of renewable energy-powered microgrids,timeof-use(TOU)pricing has been identified as an effective way for microgrid development,which is presently limited by its high *** this study,we propose an evolutionary game theoretic model to explore optimal TOU pricing for development of renewable energy-powered microgrids by applying a multi-agent system,that comprises a government agent,local utility company agent,and different types of consumer *** the proposed model,we design objective functions for the company and the consumers and obtain a Nash equilibrium using backward *** pricing strategies,namely,the TOU seasonal pricing and TOU monthly pricing,are evaluated and compared with traditional fixed *** numerical results demonstrate that TOU schedules have significant potential for development of renewable energy-powered microgrids and are recommended for an electric company to replace traditional fixed ***,TOU monthly pricing is more suitable than TOU seasonal pricing for microgrid development.

关键词： Game theory microgrid multi-agent system renewable energy time-of-use pricing

M5B3 Boride at the Grain Boundary of a Nickel-based Superalloy

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Journal of Materials Science & Technology 2016年第3期32卷 265-270页

作者： Beining Du Zhiwu Shi Jinxia Yang Zhaokuang Chu Chuanyong Cui Xiaofeng Sun Liyuan sheng Yufeng zheng institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Peking University Beijing 100871 China PKU-HKUST shen zhen-Hong Kong Institution Shenzhen 518057 China

The grain boundary microstructures of a heat-treated Ni-based cast superalloy IN792 were investigated. The results show that M5B3 boride precipitates at the grain boundary. A special orientation relationship between M5B3 phase and the matrix at one side of the grain boundary is found. At the same time, two M5B3 borides with different orientations could co-exist in a single M5B3 particle as an intergrowth besides existing alone, thus forming orientation relationship between the two M5B3 phases and matrix. This phenomenon could be attributed to the special orientation relationship between M5B3 phase and the matrix.

关键词： Nickel superalloy Grain boundaries Boride Crystal structure lntergrowth Orientation relationship

Ridge-Forward Quadratic Discriminant Analysis in High-Dimensional Situations

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Journal of Systems Science & Complexity 2016年第6期29卷 1703-1715页

作者： XIONG Cui ZHANG Jun LUO Xinchao School of Statistics East China Normal University College of Mathematics and Statistics Institute of Statistical SciencesShen Zhen-Hong Kong Joint Research Centre for Applied Statistical SciencesShenzhen University

Quadratic discriminant analysis is a classical and popular classification tool,but it fails to work in high-dimensional situations where the dimension p is larger than the sample size *** address this issue,the authors propose a ridge-forward quadratic discriminant(RFQD) analysis method via screening relevant predictors in a successive manner to reduce misclassification *** authors use extended Bayesian information criterion to determine the final model and prove that RFQD is selection *** Carlo simulations are conducted to examine its performance.

关键词： Extended BIC quadratic discriminant analysis ridge-forward selection consistency.

Application of Modified Progressive Hedging for Stochastic Unit Commitment in Electricity-Gas Coupled Systems

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 840-849页

作者： Haizhou Liu Xinwei shen Qinglai Guo Hongbin Sun Mohammad Shahidehpour Wenzhi Zhao Xinyi Zhao tsinghua-berkeley shenzhen institute Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Electrical and Computer Engineering Department Illinois Institute of Technology60616ChicagoILUnited States

The increasing number of gas-fired units has significantly intensified the coupling between electric and gas power ***,nonlinearity and nonconvexity in gas flow equations,together with renewable-induced stochasticity,resulted in a computationally expensive model for unit commitment in electricity-gas coupled integrated energy systems(IES).To accelerate stochastic day-ahead scheduling,we applied and modified Progressive Hedging(PH),a heuristic approach that can be computed in parallel to yield scenario-independent unit *** early termination and enumeration techniques,the modified PH algorithm saves considerable com,putational time for certain generation cost settings or when the scale of the IES is ***,an adapted second-order cone relaxation(SOCR)is utilized to tackle the nonconvex gas flow *** studies were performed on the IEEE *** system/Belgium 20-node gas system and the IEEE 118-bus system/Belgium 20-node gas *** computational efficiency when employing PH is 188 times that of commercial software,and the algorithm even outperforms Benders *** the same time,the gap between the PH algorithm and the benchmark is less than 0.01% in both IES systems,which proves that the solutions produced by PH reach acceptable optimality in this stochastic UC problem.

关键词： Electricity-gas coupled system integrated energy system modified Progressive Hedging second-order cone relaxation unit commitment

Boosting aqueous nickel-zinc battery stability with bimetallic ion-integrated 1D metal-organic nanowires

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Science China Chemistry 2025年

作者： Yihao Chen Jin Liang Yichun Su Guoyin Zhu Hengyue Xu Hongye Ding Guangxun Zhang Dianheng Yu Zizhou shen Yizhou Zhang Wei Huang Huan Pang School of Chemistry and Chemical Engineering Yangzhou University Key Laboratory of Flexible Electronics (KLoFE) & institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) institute of Advanced Materials and Flexible Electronics (IAMFE) School of Chemistry and Materials Science Nanjing University of Information Science & Technology Department of Chemistry Tsinghua University State Key Laboratory of Coordination Chemistry Nanjing University

Limited by low conductivity,designing cathode materials with excellent electron transfer efficiency for high-performance nickel-zinc batteries （NZBs） remains *** this study,a series of bimetallic metal-organic nanowires were fabricated by doping M ions in NiNTA,resulting in NiMNTA (M=Mg2+,Mn2+,Co2+,Zn2+,Ag+),and NixCo6-xNTA （x=1,2,3,4,5）.The proportions and types of metal ions can be modified without altering the initial coordination structure.X-ray absorption fine structure spectroscopy （XAFS） revealed that only M–O bonds,not metal bonds,were present in the *** performance of Ni2Co4NTA as the cathode for aqueous NZBs was significantly improved,achieving the maximum energy density of 279.17Wh kg-1with the high cycle stability （retention rate of 72.0%after 1,000 cycles）.The flexible Ni2Co4NTA//Zn@carbon cloth battery employing gel electrolyte also exhibits the excellent Coulombic efficiency of 96%after 350 *** approach shows considerable potential for designing one-dimensional materials with bimetallic modifications,providing new strategies for developing cathode materials for NZBs with high specific capacity and cycle stability.

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