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Journal of Advanced Ceramics 2022年第1期11卷 66-74页

作者： yu DONG Ke REN Qiankun wang gang SHAO yiguang wang Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Henan Province Industrial Technology Research Institute of Resources and Materials Zhengzhou UniversityZhengzhou 450001China

Environmental barrier coating(EbC)materials that are resistant against molten calcia-magnesia-aluminosilicate(CMAS)corrosion are urgently ***,multicomponent rare-earth(RE)disilicate((yb_(0.2)y_(0.2)Lu_(0.2)Sc_(0.2)Gd_(0.2))_(2)Si_(2)O_(7),(5RE)_(2)Si_(2)O_(7))was investigated with regard to its CMAS interaction behavior at 1400°*** with the individual RE disilicates,the(5RE)2Si2C>7 material exhibited improved resistance against CMAS *** dominant process involved in the interaction of(5RE)_(2)Si_(2)O_(7)with CMAS was reaction-recrystallization.A dense and continuous reaction layer protected the substrate from rapid corrosion at high *** results demonstrated that multicomponent strategy of RE species in disilicate can provide a new perspective in the development of promising EbC materials with improved corrosion resistance.

关键词： environmental barrier coating(EbC)materials rare-earth(RE)disilicates multicomponent ceramics calcia-magnesia-aluminosilicate(CMAS)interaction

Reconstruction of 3-D surface waves generated by moving submerged sphere based on stereo imaging principle

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Journal of Hydrodynamics 2020年第1期32卷 139-147页

作者： Xin-long wang gang Wei Hui Du Shao-dong wang Department of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China

A sailing ship can produce significant disturbances on the water surface,but the perturbation generated by a moving submerged source is much smaller due to the physical property of the free surface,as represented by the rigid-lid assumption,with the geometric displacement barely observed or *** on the stereo imaging principle,an experimental system for the three-dimensional measurement of the surface perturbation is built by assembling two charge coupled device(CCD)sensors,to measure the surface waves generated by a small submerged sphere,including the small-scale vertical displacements and the flow field on the water *** obtained results are consistent with those obtained by the theoretical analysis,and the measurement accuracy for the vertical displacements is improved by 50%compared to that of the direct optical method based on the image grey ***,the present measurement technique can be efficiently and precisely applied to other measurements of small-scale disturbances on a free surface.

关键词： Surface wake stereo imaging geometric reconstruction particle image velocimetry(PIV)

Fast degradation of azo dye by nanocrystallized Fe-based alloys

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Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 76-80页

作者： PeiPei wang JunQiang wang JunTao Huo Wei Xu XinMin wang gang wang School of Materials Science and Engineering Shanghai University CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences

Exploring new alloys with high efficiency in degrading organic pollutants in aqueous solutions is of wide interests. Here, we report that the nanocrystallized Fe82.65Si4b12Cu1.35 alloy exhibits higher efficiency in decolorizing azo dye solutions compared to its amorphous counterpart. The increased efficiency is attributed to the formation of numerous microbatteries between the α-Fe（Si） and Fe2b nanocrystalline phases, which exhibit different corrosion potentials. These results suggest that nanocrystallized Fe-based amorphous composites hold promising apolication potential in degrading azo dyes solutions.

关键词： nanocrystalline alloys amorphous alloys degradation of azo dye

Highly Reliable Multiport PUF Circuit based on MOSFET Zero Temperature Coefficient Point

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Chinese Journal of Electronics 2018年第4期27卷 873-878页

作者： LI gang wang Pengjun QIAN Haoyu Institute of Circuits and Systems Ningbo University

by using processing variations in the unitcircuits of the same structures and design parameters during manufacturing, Physical unclonable function(PUF)generates security keys with characteristic of uniqueness,randomness and unclonability. In this paper, a highly reliable multiport PUF scheme was proposed based on MOSFET Zero temperature coefficient(ZTC) point. It consists of input register, deviation-current generating module, arbiter array and obfuscation circuit. After reconfiguring deviation-current generating module by applying different input challenges, the PUF circuit updates keys without physical replacement. And multi-bit keys can be generated in one clock cycle. In TSMC-LP 65 nm CMOS technology, the layout of 64-port reconfigurable PUF occupies 131μm×242μm with custom designing. Experimental results show that the PUF circuit has good statistical characteristic of uniqueness and randomness. It exhibits high reliability of 98.2% with respect to temperature variation from –40℃ to 125℃ and supply voltage variation from 1.08 V to 1.32 V, indicating that it can be reliably and effectively used in information security field.

关键词： Physical unclonable function(PUF) Zero temperature coefficient(ZTC) Multiport Circuit design

Current Spreading Effects in Vertical GaN-based Light-Emitting Diode on Si(111) Substrate

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Chinese Journal of Electronics 2016年第4期25卷 672-677页

作者： WEI Jingting ZHANG baijun wang gang Guangdong Polytechnic Institute The Open University of Guangdong School of Microelectronics State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen University

The optimal design of Ga N-based Lightemitting diode(LED) is important for its *** this work,a new three-Dimensional(3D) circuit model with a resistor network is developed to study the current distribution in the active layer of vertical conducting Ga Nbased LED grown on Si(111) substrate with different structures and electrode *** consists of resistance of Transparent conductive layer(TCL),resistance of epitaxial layer,intrinsic diodes presenting the active layer,and Al N/Si junction as which the multilayer of Al N/Si is *** results of current distribution in active layers of two kinds of LED structures show that current distribution uniformity is greatly affected by the electrode pattern and the LED ***,the experimentally measured light emission uniformity agrees well with simulation *** electrical and optical characteristics of LED are obviously affected by the current distribution uniformity.

关键词： Light-emitting diodes Current distribution uniformity Circuit model

Data-Driven Control of Distributed Event-Triggered Network Systems

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IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 351-364页

作者： Xin wang Jian Sun gang wang Frank Allgower Jie Chen the National Key Laboratory of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of TechnologyBeijing 100081 the beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China IEEE the Institute for Systems Theory and Automatic Control University of StuttgartStuttgart 70550Germany the Department of Control Science and Engineering Tongji UniversityShanghai 201804 the National Key Laboratory of Autonomous Intelligent Unmanned Systems Beijing Institute of TechnologyBeijing 100081China

The present paper deals with data-driven event-triggered control of a class of unknown discrete-time interconnected systems(*** systems).To this end,we start by putting forth a novel distributed event-triggering transmission strategy based on periodic sampling,under which a model-based stability criterion for the closed-loop network system is derived,by leveraging a discrete-time looped-functional *** the model-based criterion with a data-driven system representation recently developed in the literature,a purely data-driven stability criterion expressed in the form of linear matrix inequalities(LMIs)is ***,the data-driven stability criterion suggests a means for co-designing the event-triggering coefficient matrix and the feedback control gain matrix using only some offline collected state-input ***,numerical results corroborate the efficacy of the proposed distributed data-driven event-triggered network system(ETS)in cutting off data transmissions and the co-design procedure.

关键词： Data-driven control distributed event-triggered network system(ETS) linear matrix inequalitie(LMI) looped-functional stability

Mesh deformation on 3D complex configurations using multistep radial basis functions interpolation

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Chinese Journal of Aeronautics 2018年第4期31卷 660-671页

作者： gang wang Xin CHEN Zhikan LIU School of Aeronautics Northwestern Polytechnical University

The Radial basis Function（RbF） method with data reduction is an effective way to perform mesh deformation. However, for large deformations on meshes of complex aerodynamic configurations, the efficiency of the RbF mesh deformation method still needs to be further improved to fulfill the demand of practical application. To achieve this goal, a multistep RbF method based on a multilevel subspace RbF algorithm is presented to further improve the efficiency of the mesh deformation method in this research. A whole deformation is divided into a series of steps, and the supporting radius is adjusted in accordance with the maximal displacement error. Furthermore, parallel computing is applied to the interpolation to enhance the efficiency. Typical deformation problems of the NASA Common Research Model（CRM） configuration, the DLR-F6 wing-body-nacellepylon configuration, and the DLR-F11 high-lift configuration are tested to verify the feasibility of this method. Test results show that the presented multistep RbF mesh deformation method is efficient and robust in dealing with large deformation problems over complex geometries.

关键词： Data reduction Greedy method Mesh deformation Radial basis function Unstructured mesh

Analysis of the y(4220)and y(4390)as molecular states with QCD sum rules

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Chinese Physics C 2017年第8期41卷 31-38页

作者： Zhi-gang wang Department of Physics North China Electric Power University Baoding 071003 China

In this article, we assign the y（4390） and y（4220） to be the vector molecular states D1（2420） and D＊ ＊0（2400）, respectively, and study their masses and pole residues in detail with the QCD sum rules. The... 详细信息

关键词： molecular states QCD sum rules

b_(c) meson and its scalar cousin with QCD sum rules

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Chinese Physics C 2024年第10期48卷 48-58页

作者： Zhi-gang wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this study,we use the optical theorem to calculate the next-to-leading order corrections to the QCD spectral densities directly in the QCD sum rules for the pseudoscalar and scalar b_(c) *** use experimental data for guidance to perform an updated *** obtain the masses and,in particular,decay constants,which are the fundamental input parameters in high energy ***,we obtain the pure leptonic decay widths,which can be compared with experimental data in the future.

关键词： next-to-leading order contributions QCD sum rules

Research of cavitation characteristics of RCP based on section-constrained blades

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Journal of Hydrodynamics 2019年第4期31卷 750-759页

作者： Rong-sheng Zhu Jun-jun Kang Qiang Fu Xiu-li wang zong-liang Chen yong-gang Lu yong Liu National Research Center of Pumps Jiangsu University Zhenjiang 212003 China

To make sure that the bubbles will not block the impeller passage in the process of the transient cavitation, a section-constrained design is adopted in the hydraulic design of the CAP 1400 Reactor Coolant Pump,s(RCP,s) impeller blade, and the cavitation bubble distribution on the suction side of the blade in the CAP 1400 RCP under the transient cavitation condition and the internal pressure pulsation are studied. To study the performance of the section-constrained impeller blade, simulations are carried out by using the CFX software, the cavitation bubble distribution on the suction side and the pulsation dynamics at each monitoring point in different extents of cavitation are obtained based on the Reynolds-averaged N-S equation and the SST k-co equation. The results show that the section-constrained blade has a good constraint capacity on the cavitation, and could enhance the passing ability of the blade in some extent. The main causes of the pressure pulsation inside a pump are the rotor-stator interaction, the separated flow at the round-like pump chamber, and the reflux inside the flow passage. The pressure pulsation inside the impeller and the guide vane is characterized by the significant periodicity, which are both affected by the rotor-stator interaction. And the impeller outlet and the guide vane inlet are more susceptible to the rotor-stator interaction. Studies of the vapor-liquid two-phase flow and the pressure pulsation inside the RCP's impeller with the transient cavitation are of great significance for the prediction of the RCP’s dynamic characteristics after the cavitation, and for the safety and the stable running of the RCP.

关键词： RCP section-constrained blade transient cavitation numerical simulation experiment pressure pulsation