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A synthesis method for logic circuits in RRAM arrays

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Science China(Information Sciences) 2020年第10期63卷 285-287页

作者： xiaole cui xiao ma Feng WEI xiaoxin cui Shenzhen Graduate School Peking University Institute of Microelectronics Peking University

Dear editor,Resistive RAM (RRAM) based logic circuits have attracted much attention in recent *** IMPLY (material implication) gates are the first published RRAM logic gate family [1],and many synthesis methods based ... 详细信息

关键词： RRAM IMPLY logic row based gate column based gate circuit synthesis

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非负随机变量函数的期望的另一公式及其应用

南阳师范学院学报 2025年第1期24卷 35-37页

作者：王霞马晓雯北京工业大学数学统计学与力学学院北京100124 齐鲁师范学院数学学院山东济南250200

探讨了随机变量函数的数学期望问题,特别是考虑了随机变量非负且函数在非负实数区间上严格单调递增的正的一阶可导函数的情况。提出了一个新的公式来计算这类函数的数学期望,该公式的积分表达式与非负随机变量的尾概率和函数的导数有关... 详细信息

探讨了随机变量函数的数学期望问题,特别是考虑了随机变量非负且函数在非负实数区间上严格单调递增的正的一阶可导函数的情况。提出了一个新的公式来计算这类函数的数学期望,该公式的积分表达式与非负随机变量的尾概率和函数的导数有关。通过Fubini定理和变量替换方法给出了两个计算期望的公式,然后提供了两个应用实例,通过实例展示了如何将定理应用于具体的函数。

关键词：非负随机变量随机变量的函数数学期望

Thermal stability,mechanical properties and corrosion behavior of a Mg–Cu–Ag–Gd metallic glass with Nd addition

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Rare Metals 2017年第3期36卷 183-187页

作者： Guan Wang cui-xia Guo Shu-Jie Pang Key Laboratory of Aerospace materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

By the minor addition of Nb to a Mg-Cu-Ag-Gd alloy,a Mg-Cu-Ag-Gd-Nb bulk metallic glass （BMG） with improved thermal stability and corrosion resistance as well as good mechanical properties was ***54Cu26.5Ag8.5Gd11-xNbx （x=0,1） BMGs with a diameter of 2 mm were fabricated by copper-mold *** Mg54Cu26.5Ag8.5Gd10Nb1 BMG exhibits enlarged supercooled liquid region of 58 *** measurements indicate that the addition of Nb improves the corrosion resistance of the Mg-based BMG in NaCl solution evidenced by the increased corrosion potential,though no significant effect of Nb on the corrosion behavior of the BMG in NaOH solution is *** Mg-Cu-Ag-Gd-Nb BMG also shows high compressive strength up to 890 MPa and elastic strain of about 1.9%.

关键词： Mg-based alloy Metallic glass Thermalstability Mechanical properties Corrosion resistance

Second-Order Two-Scale Analysis Method for the Heat Conductive Problem with Radiation Boundary Condition in Periodical Porous Domain

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Communications in Computational Physics 2013年第9期14卷 1027-1057页

作者： Qiang ma Junzhi cui LSEC ICMSECThe Academy of Mathematics and Systems ScienceCAS100190BeijingChina

In this paper a second-order two-scale(SOTS)analysismethod is developed for a static heat conductive problem in a periodical porous domain with radiation boundary condition on the surfaces of *** using asymptotic expansion for the temperature field and a proper regularity assumption on the macroscopic scale,the cell problem,effective material coefficients,homogenization problem,first-order correctors and second-order correctors are obtained *** characteristics of the asymptotic model is the coupling of the cell problems with the homogenization temperature field due to the nonlinearity and nonlocality of the radiation boundary *** error estimation is also obtained for the original solution and the SOTS’s approximation *** the corresponding finite element algorithms are developed and a simple numerical example is presented.

关键词： Periodic structure porousmaterial radiation boundary condition second-order twoscale method

machinability ofγ-TiAl:A review

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Chinese Journal of Aeronautics 2023年第7期36卷 40-75页

作者： Ziwen xia Chenwei SHAN Menghua ZHANG Minchao cui Ming LUO Key Laboratory of High Performance manufacturing for Aero Engine Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Cemented Carbide Zhuzhou 412000China

Owing to its outstanding mechanical properties,γ-TiAl is desirable materials for crossgeneration *** 70 years of exploration have made it into the initial ***,the intrinsic brittleness ofγ-TiAl is still a critical obstacle to its large-scale *** this context,researchers have made many attempts to study the machinability ofγ-*** present,existing relevant reviews have mostly discussed the processing methods ofγ-***,there is still a lack of a perspective on material properties to analyze the cutting ***,this paper provides the systematic review of such *** all,the developmental process,phase transformation,and microstructural evolution ofγ-TiAl are discussed,as well as its deformation mechanism at *** topics can provide a materials science foundation for the machining ofγ-*** then,the review focuses on the cutting mechanism and surface integrity ofγ-***,special attention is paid to the microscope deformation mechanism and surface defects evolution ofγ-TiAl during ***,the review indicates that the highperformance machining technology ofγ-TiAl faces challenges and proposes potential future research *** the difficulties during machiningγ-TiAl aero-engine components will accelerate the development of new aero-engines.

关键词： Cutting mechanism Deformation machinability Surface integrity γ-TiAl

Calibration method of mesoscopic parameter in sandy cobble soil triaxial test based on PFC3D

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1924-1933页

作者： Pengfei LI xiaopu cui Yingjie WEI Junwei xia Xinyu WANG Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China China Railway 14th Bureau Group Co. Ltd.Jinan 250014China China Railway 19 Bureau Group Rail Traffic Engineering Co. Ltd.Beijing 101399China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454000China

This paper presents a rapid and effective calibration method of mesoscopic parameters of a threedimensional particle flow code(PFC3D)model for sandy cobble *** method is based on a series of numerical tests and takes into account the significant influence of mesoscopic parameters on macroscopic ***,numerical simulations are conducted,with five implementation ***,the multi-factor analysis of variance method is used to analyze the experimental results,the mesoscopic parameters with significant influence on the macroscopic response are singled out,and their linear relations to macroscopic responses are estimated by multiple linear ***,the parameter calibration problem is transformed into a multi-objective function optimization *** simulation results are in good agreement with laboratory results both qualitatively and *** results of this study can provide a basis for the calibration of microscopic parameters for the investigation of sandy cobble soil mechanical behavior.

关键词： sandy cobble soil particle flow code orthogonal experiment regression analysis multi-objective optimization calibration

Compound Impedance Control of a Hydraulic Driven Parallel 3UPS/S manipulator

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Chinese Journal of Mechanical Engineering 2020年第4期33卷 63-76页

作者： Lihang Wang Shaofei cui Chong ma Lijie Zhang Hebei Key Laboratory of Heavy machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066004China

The hydraulic parallel manipulator combines the high-power density of the hydraulic system and high rigidity of the parallel mechanism with excellent load-carrying ***,the high-precision trajectory tracking control of the hydraulic parallel manipulator is challenged by the coupling dynamics of the parallel mechanism and the high nonlinearities of the hydraulic *** this study,the trajectory control of a 3-DOF symmetric spherical parallel 3UPS/S manipulator is *** on the highly coupling and nonlinear system dynamics,a compound impedance control method for a hydraulic driven parallel manipulator is proposed,which combines impedance control with the spatial motion characteristics of a parallel *** control strategy is divided into the inner and outer *** inner loop controls the impedance of the actuator in the joint space,and the outer loop controls the impedance of the entire platform in the task space to compensate the coupling of the actuators and improve the tracking accuracy of the moving *** impedance control does not require force or pressure sensors and is less dependent on modeling *** experimental results show that the compound impedance control effectively improves the tracking accuracy of the moving *** research proposes a compound impedance control strategy for a 3-DOF hydraulic parallel manipulator,which has high tracking precision with a simple and cheap system configuration.

关键词： Parallel manipulator Impedance control Hydraulic servo system Trajectory tracking

Some Class 1 Graphs on gc-colorings

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Acta mathematica Sinica,English Series 2016年第10期32卷 1237-1245页

作者： Hua Wen ma xia ZHANG School of mathematical Sciences Shandong Normal UniversityJi'nan 250014P·R·China

An edge-coloring of a graph G is an coloring of a graph G is an edge-coloring of G such assignment of colors to all the edges of G. A go- that each color appears at each vertex at least g（v） times. The maximum integer k such that G has a go-coloring with k colors is called the gc-chromatic index of G and denoted by X＇gc （G）. In this paper, we extend a result on edge-covering coloring of Zhang X＇gc（） = δg（G）, and Liu in 2011, and give a new sufficient condition for a simple graph G to satisfy ＇ x＇gc（G）=δg（G）,where δg（G）=minv∈V（G）{[d（v）/g（v）]}.

关键词： Edge-coloring go-coloring go-chromatic index edge covering classification problem

Impermeability Research of Autoclaved Propylene Oxide Sludge Shell-aggregate Concrete

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Journal of Wuhan University of Technology(materials Science) 2022年第2期37卷 241-247页

作者： ma Hailong cui Chong YANG Youzhen ma Wentao Archives Ningxia UniversityTinchuan 750021China School of materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Physics Electrical Information Engineering Ningxia UniversityYinchuan 750021China School of mathematics and Computer Science Ningxia UniversityTinchuan 750021China

We aimed to reuse the propylene oxide sludge(POS).Propylene oxide sludge shell-aggregate(POSS-A)and propylene oxide sludge gradient shell-aggregate(POSGS-A)whose main hydrated phase is tobermorite were successfully manufactured by the hydrothermal synthesis of POS and silica materials under the condition of autoclaved(180℃,1.0 MPa)*** of pre-wetting time of coarse aggregate and pressure application mode on the different concretes were *** experimental results show that the concrete with POSS-A as coarse aggregate(POSS-A concrete),the concrete with POS gradient shell-aggregate as coarse aggregate(POSGS-A concrete),sintered aggregate concrete and common concrete,all have excellent impermeability performance whatever the pre-wetting time of coarse aggregate is 0.5 h or 24 h,and the pre-wetting time of coarse aggregate has a negligible influence on the *** influence degree of pressure application mode on the impermeability performance of the sintered aggregate concrete is the greatest among three kinds of concrete,which has a negligible influence on impermeability performance of the other ***-A can be used as a green building light aggregate in hydraulic concrete.

关键词： propylene oxide sludge hydrothermal synthesis autoclaved aggregate impermeability concrete