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Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1363-1370页

作者： jin-xiong hou jing Fan Hui-jun Yang Zhong Wang Jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials(Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China

Using thermochemical treatments,boronized layers were successfully prepared on Al0.25CoCrFeNi high-entropy alloys(HEAs).The thickness of the boronized layers ranged widely from 20 to 50μm,depending on the heat treatment *** remarkably improved the surface hardness from HV 188 to HV 1265 after treating at 900°C for 9 ***,boronizing enhanced the yield strength of HEAs from 195 to 265 MPa but deteriorated the tensile *** crackings in the boride layers significantly decreased the *** insufficient work-hardening capacity essentially facilitated the plastic instability of the boronized *** decreasing substrate thickness,the fracture modes gradually transformed from dimples to quasi-cleavage and eventually to cleavage.

关键词： boronizing high-entropy alloys boride layers tensile strength cleavage fracture

Tensile strength prediction of dual-phase Al0.6CoCrFeNi high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1341-1346页

作者： Min Zhang jin-xiong hou Hui-jun Yang Ya-qin Tan Xue-jiao Wang Xiao-hui Shi Rui-peng Guo Jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

The evolution of the microstructure and tensile properties of dual-phase Al0.6CoCrFeNi high-entropy alloys(HEAs)subjected to cold rolling was *** homogenized Al0.6CoCrFeNi alloys consisted of face-centered-cubic and body-centered-cubic phases,presenting similar mechanical behavior as the as-cast *** yield and tensile strengths of the alloys could be dramatically enhanced to^1205 MPa and^1318 MPa after 50%rolling reduction,respectively.A power-law relationship was discovered between the strain-hardening exponent and rolling *** tensile strengths of this dual-phase HEA with different cold rolling treatments were predicted,mainly based on the Hollomon relationship,by the strain-hardening exponent,and showed good agreement with the experimental results.

关键词： dual-phase high-entropy alloys cold rolling strain-hardening exponent tensile strength

Negative PO3-implanted bionic ion transport channels for promoting Li-S battery

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Science China Chemistry 2025年

作者： Wenhuan Huang Shun Wang Xuehan hou Yanan Zhang Xingxing Zhang Yaoxiao Zhao Xilang jin Huabin Zhang Fei Wang Jian Zhang Key Laboratory of Chemical Additives for China National Light Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and Technology School of Materials and Chemical Engineering Xi'an Technological University Chemistry Program Physical Science and Engineering Division King Abdullah University of Science and Technology State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Lithium-sulfur （Li-S） battery,as a promising next-generation high-energy-density battery,suffers from lithium polysulfides（LPSs） shuttle and Li dendrites *** crystalline framework-based membranes as separator can effectively absorb and restrain LPSs but without precise structural design principal exploration and mechanism ***,bio-inspired 1D oriented lithium-ion transport channels with molecular negatively charged PO3（-1） have been developed in hybrid tetrazole frameworks for promoting the transmission of Li+*** theoretical calculations and in situ spectroscopy demonstrated the higher binding energy and inhibited diffusion of LPSs in *** assembled PP@PO3Janus separator in Li-S coin cell delivered a high initial capacity of 1410.9 mAh g-1at 0.1 C and a low attenuation rate of 0.038%per cycle over 500 cycles at 5 ***,the high capacities of 862,542 and 409 mAh g-1based on high-sulfur-loading cathodes of 2.6,3.8 and 5.0 mg cm-2at0.5 C were achieved,***,the punch battery of PO3@PP separator with S-cathode of 1.2 mg cm-2has been developed for demonstrating its potentials commercial application,which displays impressive capacity of 873.4 mAh g-1with the retention of～78.9%over 50 cycles.

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Numerical analysis and optimization of the inlet stage of a multi-stage high pressure compressor

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航空动力学报 2007年第8期22卷 1356-1364页

作者： XU Quan-yong hou An-ping xiong jin-song Zhou Sheng National Key Laboratory on Aero-engines School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100083

An opti mization process is used to redesign blades of a high-pressure *** artificial neural network (ANN) method is coupled to Navier-Stokes solvers and is applied to three different redesigns.A newrotor blade of a transonic compressor is designed by modifying thick,stacking line andinlet angle using a 3Dapproach,with a significant efficiencyi mprovement at the design *** off-design behavior of this new compressor is also checked afterwards,which shows that the whole performance of the inlet stage is improved over a wide range of mass *** losses are reduced,proving the good performance of the opti *** whole results indicate that the opti mization method can find i mproved design and can be integrated in a design procedure.

关键词：数学分析最优化航天推进系统高压压缩机人工神经网络叶栅

ARTIFICIAL BOUNDARY METHOD FOR THE THREE-DIMENSIONAL EXTERIOR PROBLEM OF ELASTICITY

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Journal of Computational Mathematics 2005年第6期23卷 603-618页

作者： hou-de Han Chun-xiong Zheng Department of Mathematical Sciences Tsinghua University Beijing 100084 China Department of Mathematics University of Science and Technology of China Hefei 230026 China

The exact boundary condition on a spherical artificial boundary is derived for the three-dimensional exterior problem of linear elasticity in this paper. After this boundary condition is imposed on the artificial boundary, a reduced problem only defined in a bounded domain is obtained. A series of approximate problems with increasing accuracy can be derived if one truncates the series term in the variational formulation, which is equivalent to the reduced problem. An error estimate is presented to show how the error depends on the finite element discretization and the accuracy of the approximate problem. In the end, a numerical example is given to demonstrate the performance of the proposed method.

关键词： artificial boundary method unbounded domains elasticity

Large-Scale Vehicle Platooning:Advances and Challenges in Scheduling and Planning Techniques

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Engineering 2023年第9期28卷 26-48页

作者： jing hou Guang Chen jin Huang Yingjun Qiao Lu xiong Fuxi Wen Alois Knoll Changjun Jiang School of Automotive Studies Tongji UniversityShanghai 201804China College of Electronic and Information Engineering Tongji UniversityShanghai 201804China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China College of Transportation Engineering Tongji UniversityShanghai 201804China Chinese Academy of Engineering Beijing 100088China School of Computation Information and TechnologyTechnical University of MunichMunich 80333Germany

Through vehicle-to-vehicle(V2V)communication,autonomizing a vehicle platoon can significantly reduce the distance between vehicles,thereby reducing air resistance and improving road traffic *** gradual maturation of platoon control technology is enabling vehicle platoons to achieve basic driving functions,thereby permitting large-scale vehicle platoon scheduling and planning,which is essential for industrialized platoon applications and generates significant economic *** and planning are required in many aspects of vehicle platoon operation;here,we outline the advantages and challenges of a number of the most important applications,including platoon formation scheduling,lane-change planning,passing traffic light scheduling,and vehicle resource *** paper’s primary objective is to integrate current independent platoon scheduling and planning techniques into an integrated architecture to meet the demands of large-scale platoon *** this end,we first summarize the general techniques of vehicle platoon scheduling and planning,then list the primary scenarios for scheduling and planning technique application,and finally discuss current challenges and future development trends in platoon scheduling and *** hope that this paper can encourage related platoon researchers to conduct more systematic research and integrate multiple platoon scheduling and planning technologies and applications.

关键词： Autonomous vehicle platoon Autonomous driving Connected and automated vehicles Scheduling and planning techniques

The Impact of Competition on Analysts’Forecasts:A Simple Agent-Based Model

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Journal of Systems Science & Complexity 2020年第6期33卷 1980-1996页

作者： ZHANG jin xiong xiong AN Yahui FENG Xu College of Management and Economics Tianjin UniversityTianjin 300072China School of Economics Tianjin University of CommerceTianjin 300134China College of Management and Econonics Tianjin UniversityTianjin 300072China

This paper builds an agent-based model to study the impact of analyst competition on analyst *** strategies(a catering strategy and a pressure strategy)are used to model analysts conflicts of interest between listed corporations and institutional *** finding suggests that the relationship between competition and analyst optimism is ***-level competition generates more analyst unbiased ***,the condition of no competition or high-level competition generates more analyst optimistic *** empirical test also confirms that analysts issue less biased earnings forecasts under the condition of low-level competition.

关键词： Agent-based model analyst forecasts conflicts of interest

On-orbit real-time magnetometer bias determination for micro-satellites without attitude information

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Chinese Journal of Aeronautics 2015年第5期28卷 1503-1509页

作者： Zhang Zhen xiong Jianping jin jin Department of Precision Instrument Tsinghua University Space Center Tsinghua University

Due to the disadvantages such as complex calculation, low accuracy of estimation, and being non real time in present methods, a new real-time algorithm is developed for on-orbit mag- netometer bias determination of micro-satellites without attitude knowledge in this paper. This method uses the differential value approach. It avoids the impact of quartic nature and uses the iterative method to satisfy real-time applications. Simulation results indicate that the new real-time algorithm is more accurate compared with other methods, which are also tested by an experiment system using real noise data. With the new real-time algorithm, a magnetometer calibration can be taken on-orbit and will reduce the demand for computing power effectively.

关键词： Magnetometer bias:On-orbit determinationMicro-satellite Attitude-independent Real-time

A FINITE DIMENSIONAL METHOD FOR SOLVINGNONLINEAR ILL-POSED PROBLEMS

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Journal of Computational Mathematics 1999年第3期17卷 315-326页

作者： jin, QN hou, ZY Nanjing Univ Inst Math Nanjing 210008 Peoples R China Fudan Univ Inst Math Shanghai 200433 Peoples R China

We propose a finite dimensional method to compute the solution of nonlinear ill-posed problems approximately and show that under certain conditions, the convergence can be guaranteed. Moreover, we obtain the rate of convergence of our method provided that the true solution satisfies suitable smoothness condition. Finally, we present two examples from the parameter estimation problems of differential equations and illustrate the applicability of our method.

关键词： nonlinear ill-posed problems finite dimensional method convergence and convergence rates