检索结果-南通市图书馆

Journal of Iron and Steel Research International 2017年第3期24卷 328-334页

作者： hui-hui Xiong Heng-hua Zhang hui-ning Zhang Yang Zhou State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai University School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology

The segregation behavior of alloying elements X（ X = Zr,V,Cr,Mn,Mo,W,Nb,Y） on the ferrite（ 100） /TiC（ 100） interface has been investigated using first principles method,and the work of separation and interface energy of ferrite / TiC interfaces alloyed by these elements were also analyzed. The results indicated that all these alloying additives except Y were thermodynamically favorable because of the negative segregation energy,showing that they have the tendency to segregate to the ferrite / TiC interface. When the Fe atom in the ferrite /TiC interface is replaced by Y,Zr,or Nb,the adhesive strength of the interface will be weakened due to the lower separation work,larger interfacial energy,and weaker electron effects. However,the introduction of Cr,Mo,W,Mn and V will improve the stability of the ferrite / TiC interface through strong interaction between these elements and C,and Cr-doped interface is the most stable structure. Therefore,the Cr,Mo,W,Mn and V in ferrite side of the interface can effectively promote ferrite heterogeneous nucleation on TiC surface to form fine ferrite grain.

关键词： Fe/TiC interface Alloying element Heterogeneous nucleation Segregation First-principles

Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第3期37卷 371-384页

作者： Xia-hui Pan School of Civil Engineering Henan Polytechnic UniversityJiaozuo454003China

Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface *** the effects of residual surface stress and surface elasticity are *** stress function method and Fourier integral transform technique are *** solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at *** results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the *** elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally *** the remaining situations,combined effects of surface elasticity and residual surface stress should be *** results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface *** solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.

关键词： Surface effects Residual surface stress Surface elasticity Half-plane Analytical solutions

First-principles study on stability, electronic, and mechanical properties of La-C and Ce-C binary compounds

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

Journal of Iron and Steel Research International 2019年第7期26卷 771-778页

作者： hui-ning Zhang Qiu-yan Wu Zhen-ying Hu hui Li hui-hui Xiong An-jun Xu School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 Jiangxi China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 Hubei China Hubei Provincial Key Laboratory for New Processes of Iron making and Steelmaking Wuhan University of Science and Technology Wuhan 430081 Hubei China Ganhua Security Technology Co. Ltd. Nanchang 330001 Jiangxi China China Metallurgical Planning Net Beijing 100711 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The phase stability and electronic and mechanical properties of rare earth (RE) carbides (La2C3, LaC2, Ce2C3, CeC2, and CeC) were investigated using first-principles calculations based on density functional theory. The calculated equilibrium lattice constants and cell volume agree well with available experimental data. The cohesive energy and formation enthalpy of these carbides show that they are thermodynamically and mechanically stable except LaC. The strong covalent bonding exists in these compounds, and the covalent bonds are mainly determined to be RE-C and C-C bonds. The hardness of RExCy compounds is less than 10 GPa, and the bulk modulus, shear modulus, and Young's modulus of Ce2C3 are the largest. The values of BIG (ratio of bulk modulus to shear modulus) and Poisson's ratio indicate that all the compounds have good ductility, and the ductility of CeC is larger than others. The Debye temperature of Ce2C3 is 429.67 K, which is the highest in those of experimental compounds.

关键词： Rare earth carbide Electronic structure Mechanical property First principle

基于轻量化卷积神经网络的桥梁斜拉索PE护套损伤识别方法

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

土木与环境工程学报（中英文） 2025年第1期47卷 167-178页

作者：刘啸宇黄永徐峰李惠上海交通大学船舶海洋与建筑工程学院上海200240 哈尔滨工业大学土木工程学院哈尔滨150090

深度神经网络和计算机视觉技术近年来在结构健康监测中发挥了越来越重要的作用。利用无人机航拍采集的桥梁斜拉索损伤图像数据,研究基于深度学习技术的斜拉索PE护套损伤识别方法。为实现在较低运算能力设备上对大跨度桥梁斜拉索表面局... 详细信息

深度神经网络和计算机视觉技术近年来在结构健康监测中发挥了越来越重要的作用。利用无人机航拍采集的桥梁斜拉索损伤图像数据,研究基于深度学习技术的斜拉索PE护套损伤识别方法。为实现在较低运算能力设备上对大跨度桥梁斜拉索表面局部损伤的智能快速识别,解决传统深度卷积神经网络的运算效率相对较低、模型参数规模较大的问题,提出轻量化处理的区域推荐型卷积神经网络模型。介绍区域推荐网络与其轻量化改进方法的理论基础,分析轻量化模型处理的必要性,其能在保证识别精度的前提下降低模型训练与预测的设备性能需求,达到节约计算资源与时间的目的;通过数据增广等多手段解决损伤样本数据量不足的问题,设置对比试验,统计分析结果,验证了轻量化神经网络模型的优越性。结果表明,轻量化网络在牺牲少量识别准确度的前提下,能够在较大程度上实现对模型复杂度与计算量的改进,在工程应用中能有效拓展神经网络的实用性。

关键词：桥梁斜拉索智能损伤识别轻量化神经网络计算机视觉深度学习

Novel eco-friendly spherical porous adsorbent fabricated from Pickering middle internal phase emulsions for removal of Pb(Ⅱ) and Cd(Ⅱ)

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第2期34卷 320-330页

作者： hui Yu Yongfeng Zhu Aiping hui Aiqin Wang Key Laboratory of Clay Mineral Applied Research of Gansu Province Center of Eco-material and Green ChemistryLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Spherical porous materials prepared from the emulsion template used in the water treatment have displayed a vast prospect, as the high surface area, abundant porous structure, convenient operation and excellent adsorption performance. But the tedious fabrication process, high consumption of organic solvent and surfactant limited the application widely. Herein, a facile and eco-friendly spherical porous adsorbent(SPA) is fabricated from the green surfactant-free(corn oil)-in-water Pickering medium internal phase emulsions(Pickering MIPEs) via the convenient ion crosslinking procedure. The Pickering MIPEs synergistically stabilized with the semi-coke(SC), which is the natural particle produced from the shale oil distillation, and sodium alginate(SA) has excellent storage and anti-coalescence stability. The as-prepared porous adsorbent possessed the abundant pore structure, which provided favorable conditions for effective mass transfer in adsorption, and could be tuned by varying the SA dosage. The saturation adsorption capacities of Pb(II) and Cd(II) can be achieved with 460.54 and 278.77 mg/g within 45 min at 25 ℃, respectively. Overall, this study supplied a viable and eco-friendly route for fabricating the spherical porous adsorbent with a tunable porous structure for heavy metal ion wastewater.

关键词： Spherical porous adsorbent(SPA) Emulsion template Semi-coke Adsorption Heavy metal ion

Scenario Prediction and Analysis of Urban Growth Using SLEUTH Model

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2012年第2期22卷 206-216页

作者： FENG hui-hui LIU hui-Ping LU Ying School of Geography Beijing Normal UniversityBeijing 100875(China)

Scenario prediction was introduced to better understand urban dynamics and to support urban planning. Taking the Dongguan central urban area of the Pearl River Delta, China as an example, three urban development scenarios, historical trend (HT) scenario, forest protection (FP) scenario, and growth restriction (GR) scenario, were designed and transplanted into the SLEUTH model through the parameter self-modification method. The quantitative analysis results showed that the urban area would expand continuously from 2003 to 2030 under the HT scenario. More land resources would be saved under the GR scenario than FP scenario. Furthermore, the urban growth under the HT and FP scenarios would come to a steady state by 2020, while this deadline of the GR scenario would be postponed to 2025. The spatial pattern analysis using five spatial metrics, class area, number of patches, largest patch index, edge density, and contagion index, showed that under all the scenarios, the urban patches would become bigger and the form would become more compact, and the urban form under the GR scenario would be the smallest and most heterogeneous. These demonstrated that the GR scenario was more effective in meeting the goal of land protection and sustainable development for the study area.

关键词： central urban area land protection land resources spatial metrics sustainable development

Chemical structure of grain-boundary layer in SrTiO_3 and its segregation-induced transition: A continuum interface approach

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第6期27卷 3-12页

作者： hui Gu School of Materials Science ＆ Engineering Materials Genome Institute Shanghai University Shanghai 200444 China

Grain-boundary（GB） structures are commonly imaged as discrete atomic columns, yet the chemical modifications are gradual and extend into the adjacent lattices, notably the space charge, hence the two-dimensional defects may also be treated as continuum changes to extended interfacial structure. This review presents a spatially-resolved analysis by electron energy-loss spectroscopy of the GB chemical structures in a series of SrTiO3 bicrystals and a ceramic, using analytical electron microscopy of the pre-Cs-correction era. It has identified and separated a transient layer at the model Σ5 grain-boundaries（GBs） with characteristic chemical bonding, extending the continuum interfacial approach to redefine the GB chemical structure. This GB layer has evolved under segregation of iron dopant, starting from subtle changes in local bonds until a clear transition into a distinctive GB chemistry with substantially increased titanium concentration confined within the GB layer in 3-unit cells, heavily strained, and with less strontium. Similar segregated GB layer turns into a titania-based amorphous film in SrTiO3 ceramic, hence reaching a more stable chemical structure in equilibrium with the intergranular Ti2O3 glass also. Space charge was not found by acceptor doping in both the strained Σ5 and amorphous GBs in SrTiO3 owing to the native transient nature of the GB layer that facilitates the transitions induced by Fe segregation into novel chemical structures subject to local and global equilibria. These GB transitions may add a new dimension into the structure–property relationship of the electronic materials.

关键词： space charge layer strontium titanate bicrystal spatially-resolved electron energy-loss spec- troscopy interfacial transition

Vibration attenuation performance of wind turbine tower using a prestressed tuned mass damper under seismic excitation

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第2期23卷 511-524页

作者： Lei Zhenbo Liu Gang Wang hui hui Yi School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityMinistry of EducationChongqing 400045China

With the rapid development of large megawatt wind turbines,the operation environment of wind turbine towers(WTTs)has become increasingly *** particular,seismic excitation can create a resonance response and cause excessive vibration of the *** investigate the vibration attenuation performance of the WTT under seismic excitations,a novel passive vibration control device,called a prestressed tuned mass damper(PS-TMD),is presented in this ***,a mathematical model is established based on structural dynamics under seismic ***,the mathematical analytical expression of the dynamic coefficient is deduced,and the parameter design method is obtained by system tuning ***,based on a theoretical analysis and parameter design,the numerical results showed that the PS-TMD was able to effectively mitigate the resonance under the harmonic basal ***,the time-history analysis method is used to verify the effectiveness of the traditional pendulum tuned mass damper(PTMD)and the novel PS-TMD device,and the results indicate that the vibration attenuation performance of the PS-TMD is better than the *** addition,the PS-TMD avoids the nonlinear effect due to the large oscillation angle,and has the potential to dissipate hysteretic energy under seismic excitation.

关键词： wind turbine tower prestressed tuned mass damper vibration control seismic excitation numerical simulation

Light People:Professor Xi-Cheng Zhang

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第10期11卷 2282-2287页

作者： hui Wang Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina

Biography:Professor Xi-Cheng Zhang graduated from Peking University in 1982 and received his PhD in physics from Brown University,Providence,RI in *** was a visiting scientist at MIT in 1985;1985 to 1987,he worked in the Physical Technology Division of Amoco Research Center;1987 to 1991,he was in the Electrical Engineering Department at Columbia University.

关键词： visiting Peking graduate

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

Striking stripes

Science China(Physics,Mechanics & Astronomy) 2017年第8期60卷 80-81页

作者： hui Zhai Institute for Advanced Study Tsinghua University

Spin-orbit coupling is a relativistic effect for the charge par- ticles such as electrons. It has been found that the spin-orbit coupling plays an important role in many branches of physics, for instance, in condensed matter physics, the spin-orbit cou- pling is the key ingredient responsible for the spintronics [ 1 ] and the topological insulator [2]. Nevertheless, in the past, the effect of spin-orbit coupling has only been investigated in many-body systems of fermions. What happens if the spin-orbit coupling is introduced to an interacting boson sys- tem？ Previously, such a system barely exists, while the recent progress of cold atom physics makes it possible. In fact, this is one of a few examples that the recent developments of cold atom physics introduce new physics to us.

关键词：自旋-轨道耦合自旋轨道耦合原子物理学自旋电子学条纹多体系统相对论效应凝聚态物理