检索结果-南通市图书馆

Weakening of the anisotropy of surface roughness in ultra-precision turning of single-crystal silicon

Chinese Journal of Aeronautics 2015年第4期28卷 1273-1280页

作者： wang Minghai wang ben Zheng Yaohui Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace University School of Mechanical Engineering & Automation Beijing University of Aeronautics & Astronautics

Ultra-precision machining causes materials to undergo a greatly strained deformation process in a short period of *** effect of shear strain rates on machining quality, in particular on surface anisotropy, is a topic deserving of research that has thus far been *** study analyzes the impact of the strain rate during the ultra-precision turning of single-crystal silicon on the anisotropy of surface *** on the establishment of cutting models considering the tool rake angle and the edge radius, this is the first research that takes into account the strain rate dislocation emission criteria in studying the effects of the edge radius, the cutting speed, and the cutting thickness on the plastic deformation of single-crystal *** results of this study show that the uses of a smaller edge radius, faster cutting speeds, and a reduced cutting thickness can result in optimally uniform surface roughness, while the use of a very sharp cutting tool is essential when operating with smaller cutting thicknesses.A further finding is that insufficient plastic deformation is the major cause of increased surface roughness in the ultra-precision turning of brittle *** this basis, we propose that the capacity of single-crystal silicon to emit dislocations be improved as much as possible before brittle fracture occurs, thereby promoting plastic deformation and minimizing the anisotropy of surface roughness in the machined workpiece.

关键词： Anisotropy of surface roughness Cutting speed Edge radius Single-crystal silicon Strain rate Ultra-precision turning Weakening

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

MIXED LEGENDRE-HERMITE PSEUDOSPECTRAL METHOD FOR HEAT TRANSFER IN AN INFINITE PLATE

引用

Journal of Computational Mathematics 2005年第6期23卷 587-602页

作者： Tian-jun wang ben-yu Guo Department of Mathematics Division of Computational Science of E-institute of Shanghai Universities Shanghai Normal University Shanghai 200234 China

A new mixed Legendre-Hermite interpolation is introduced. Some approximation results are established. Mixed Legendre-Hermite pseudospectral method is proposed for non-isotropic heat transfer in an infinite plate. Its ... 详细信息

关键词： Non-isotropic heat transfer Infinite plate Mixed Legendre-Hermite pseudospectral method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fabrication of bioinspired edible liquid marble with phase transition and tunable water barrier property

引用

Bio-Design and Manufacturing 2021年第4期4卷 889-901页

作者： Daheng wang Shanpeng Li ben wang Zhiguang Guo Weimin Liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan 430062China University of Chinese Academy of Sciences Beijing 100039China College of Engineering Lishui UniversityLishui 323000China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

Based on aphid wax-honeydew marble and the hydrophobic wax structure of lotus and its derived applications with superareophilic and superhydrophobic properties,edible carnauba wax and beeswax particles were mixed and utilized to mimic lotus wax and wrap liquid,thus forming liquid marbles(LMs).Through the utilization of continuous production system(CPS),wax as an interfacial surfactant,water and solid,air-phase or mixed-phase marble content was *** edible liquid marble(ELM)could encapsulate water and food *** solid marble(ESM)and edible solid hollow marbles(ESHMs)could be fabricated by applying pectin or ***,through the heating of wax powders with different melting temperatures,stable tablets and hollow capsules could be *** wax powder as interfacial surfactant could firmly bind with pectin through hydrogen bonds on *** edible LMs can therefore be applied for residue reduction,corrosion reduction,biohazard prevention and cleaning in the food *** other phase LMs could act as novel tools in the pharmaceutical and food industries with the above-mentioned water transport,preservation,sustained releasing and selective releasing abilities.

关键词： Wax particle mixture Edible Hydrophobic powder Liquid marble Phase transition Food

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear variable structure excitation and steam valving controllers for power system stability

引用

控制理论与应用（英文版） 2009年第1期7卷 97-102页

作者： ben wang Zongyuan MAO School of Electricity Engineering Southwest Jiaotong University Chengdu Sichuan 610013 China College of Automation Science and Engineering South China University of Technology Guangzhou Guangdong 510641 China

A set of novel nonlinear variable structure excitation and steam-valving controllers are proposed in this paper. On the basis of the classical dynamic equations of a generator, excitation control and steam valving control are simultaneously considered. Design of these controllers combines the differential geometry theory with the variable structure controlling theory. The mathematical model in the form of ＂an affine nonlinear system＂ is set up for the control design of a large-scale power plant. The dynamic performance of the nonlinear variable structure controllers proposed for a single machine connected to an infinite bus power system is simulated. Simulation results show that the nonlinear variable structure excitation and steam-valving controllers give satisfactory dynamic performance and good robustness.

关键词： Excitation control Nonlinear control Steam valving control Variable structure control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Accelerating Optimization Design of Bio-inspired Interlocking Structures with Machine Learning

引用

Acta Mechanica Solida Sinica 2023年第6期36卷 783-793页

作者： Zhongqiu Ding Hong Xiao Yugang Duan ben wang School of Mechanical Engineering State Key Lab for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710049China

Structural connections between components are often weak areas in engineering *** nature,many biological materials with remarkablemechanical performance possess flexible and creative *** this work,we propose a novel bioinspired interlocking tab considering both the geometry of the tab head and neck,and demonstrate a new approach to optimize the bio-inspired interlocking structures based on machine *** neural networks for different optimization objectives are developed and trained using a database of thousands of interlocking structures generated through finite element *** show that the proposed method is able to achieve accurate prediction of the mechanical response of any given interlocking *** optimized designs with different optimization objectives,such as strength,stiffness,and toughness,are obtained efficiently and *** optimum design predicted by machine learning is approximately 7.98 times stronger and 2.98 times tougher than the best design in the training set,which are validated through additive manufacturing and experimental *** machine learning-based optimization approach developed here can aid in the exploration of the intricate mechanism behind biological materials and the discovery of new material designs boasting orders of magnitude increase in computational efficacy over conventional methods.

关键词： Interlocking structure Performance prediction Additive manufacturing Artificial neural network Finite element analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light-Triggered Catalytic Performance Enhancement Using Magnetic Nanomotor Ensembles

引用

Research 2020年第1期2020卷 986-996页

作者： Fengtong Ji ben wang Li Zhang Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatin N.T.Hong KongChina Chow Yuk Ho Technology Centre for Innovative Medicine The Chinese University of Hong KongShatin N.T.Hong KongChina

Micro/nanomachines have attracted extensive attention in the biomedical and environmental fields for realizing functionalities at small ***,they have been rarely investigated as active *** nanocatalysts have exceptional reusability and recyclability,and integration with magnetic materials enables their recovery with minimum ***,we propose a model active nanocatalyst using magnetic nanomotor ensembles(MNEs)that can degrade contaminants in an aqueous solution with high catalytic *** composed of a magnetite core coated with gold nanoparticles as the nanocatalyst can rotate under the action of a programmable external field and carry out rapid reduction of 4-nitrophenol(4-NP).The hydrogen bubbles generated in the catalytic reaction provide random perturbations for the MNEs to travel in the reaction solution,resulting in uniform *** reduction can be further boosted by irradiation with near-infrared(NIR)*** field induces the rotation of the MNEs and provides microstirring in the *** enhances the catalytic activity via the photothermal *** MNEs are also capable of moving to the targeted region through the application of a programmable magnetic field and then process the contaminant in the targeted *** expect that such magnetic MNEs may help better in applying active heterogeneous nanocatalysts with magnetic field and light-enhanced performance in industrial applications due to their advantages of low material cost and short reaction time.

关键词： effect catalyst stirring

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of the Boundary on the Dynamics of Solitary Waves

引用

Chinese Physics Letters 1996年第7期13卷 481-484页

作者： wang Jun-yi wang Wei wang ben-ren WEI Rong-jue Institute of Acoustics Nanjing UniversityNanjing 210093 Department of Physics and Institute for Solid State Nanjing UniversityNanjing 210093

The effect of the boundary on the dynamics of solitary waves has been *** inverse scattering transformation for the solitary wave equation with boundary condition is treated by the reduction group *** effective potential of interaction between the solitary wave and the boundary is found to be same as the Morse *** physical mechanism of the soliton oscillation could be interpreted by our results.

关键词： potential theory solitary

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Quantitative Metal Magnetic Memory Reliability Modeling for Welded Joints

引用

Chinese Journal of Mechanical Engineering 2016年第2期29卷 372-377页

作者： XING Haiyan DANG Yongbin wang ben LENG Jiancheng School of Mechanical Science and Engineering Northeast Petroleum University

Metal magnetic memory（MMM） testing has been widely used to detect welded joints. However, load levels, environmental magnetic field, and measurement noises make the MMM data dispersive and bring difficulty to quantitative evaluation. In order to promote the development of quantitative MMM reliability assessment, a new MMM model is presented for welded joints. Steel Q235 welded specimens are tested along the longitudinal and horizontal lines by TSC-2M-8 instrument in the tensile fatigue experiments. The X-ray testing is carried out synchronously to verify the MMM results. It is found that MMM testing can detect the hidden crack earlier than X-ray testing. Moreover, the MMM gradient vector sum K_（vs） is sensitive to the damage degree, especially at early and hidden damage stages. Considering the dispersion of MMM data, the K_（vs） statistical law is investigated, which shows that K_（vs） obeys Gaussian distribution. So K_（vs） is the suitable MMM parameter to establish reliability model of welded joints. At last, the original quantitative MMM reliability model is first presented based on the improved stress strength interference theory. It is shown that the reliability degree R gradually decreases with the decreasing of the residual life ratio T, and the maximal error between prediction reliability degree R_1 and verification reliability degree R_2 is 9.15%. This presented method provides a novel tool of reliability testing and evaluating in practical engineering for welded joints.

关键词： metal magnetic memory quantitative reliability modeling welded joints

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Novel System Model based on Cost-prediction for Spectrum Leasing in Cognitive Radio

引用

China Communications 2010年第2期7卷 32-41页

作者： wang Weidong wang ben Zhang Yinghai Zhao Xinlei wang Shoufeng Information ＆ Electronics Technology Lab Beijing University of Posts and Telecommunications Beijing 100876 China

In current researches on spectrum leasing, Common model and Property-right model are two main approaches to dynamic spectrum sharing. However, Common model does not consider the obligation of Primary System (PS) and is unfair to Secondary System (SS), while the cooperation based on Property-rights model has problems on its feasibility. This paper proposes a novel system model, in which a Cost-Prediction scheme for Spectrum Leasing (CPSL scheme) is designed to forecast the cost that PS would pay for leasing spectrum. Cost Function is introduced as a criterion to evaluate the potential cost of spectrum leasing for PS. The simulation results show that compared with Common model based scheme, CPSL scheme substantially improves the QoS of the delay-sensitive traffic in SS at the cost of a small degradation of PS performance.

关键词： cognitive radio spectrum leasing cost prediction dynamic spectrum sharing CPSL

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hydrogen inhibition effect of chitosan and sodium phosphate on ZK60 waste dust in a wet dust removal system:A feasible way to control hydrogen explosion

引用

Journal of Magnesium and Alloys 2023年第8期11卷 2916-2926页

作者： Yuyuan Zhang Kaili Xu Jiahuan Li Bo Liu ben wang College of Resources and Civil Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines NO.3-11

Wet dust removal systems used to control dust in the polishing or grinding process of Mg alloy products are frequently associated with potential hydrogen explosion caused by magnesium-water *** purpose of avoiding hydrogen explosion risks,we try to use a combination of chitosan(CS)and sodium phosphate(SP)to inhibit the hydrogen evolution reaction between magnesium alloy waste dust and *** hydrogen evolution curves and chemical kinetics modeling for ten different mixing ratios demonstrate that 0.4wt%CS+0.1wt%SP yields the best inhibition efficiency with hydrogen generation rate of almost *** and EDS analyses indicate that this composite inhibitor can create a uniform,smooth,tight protective film over the surface of the alloy dust *** and XRD analysis of the chemical composition of the surface film show that this protective film contains CS and SP chemically adsorbed on the surface of ZK60 but no detectable Mg(OH)_(2),suggesting that magnesium-water reaction was totally *** new method offers a thorough solution to hydrogen explosion by inhibiting the hydrogen generation of magnesium alloy waste dust in a wet dust removal system.

关键词： ZK60 waste dust Hydrogen inhibition Wet magnesium alloy waste dust collection system Chitosan Sodium phosphate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：