二次受力CFRP布加固混凝土矩形柱抗压强度计算方法研究

在一次受力下CFRP布加固混凝土矩形柱抗压强度理论公式的基础上,按照叠加原理和强度代换原理推导了二次受力下CFRP布加固混凝土矩形柱抗压强度理论公式,并采用ANSYS软件对CFRP布加固混凝土柱的二次受力性能进行了数值模拟,将试验值与理论值及ANSYS值进行对比,结果基本吻合,证明了理论推导的科学性,为加固工程提供了一定的理论参考．     

基于改进Petri网技术的智能操作票系统的应用

在Petri网模型构建的操作票知识库的基础上,利用Petri网的动态行为设计相应推理机制,使推理过程形式化,实现推理过程与规则表示的完全分离,提高了电网调度操作票专家系统的通用性和灵活性;同时,改进后的推理方法通过改变Petri网的运行规则和引入抑制弧,并利用Petri网技术对操作任务进行分解,对子任务建立基本Petri网,简化了推理过程,提高了推理效率,解决了"状态组合爆炸"问题。实例表明,改进Petri网的推理机制可有效提高操作票专家系统的适应性。     

螺母与钢,镀锌和镀铝薄板凸焊的研究

本文根据机械标准件行业新开发的焊接螺母技术要求,先后对DIN928方形螺母、DIN929六角形螺母与厚度0.5～4mm钢板,0.5～2mm镀锌和镀铝薄板进行了凸焊性能试验研究。试验结果表明,凸焊工艺稳定,凸焊接头质量良好。接头的抗扭强度达到和超过了DIN928,DTN929标准。从系列试验中获得了最佳凸焊工艺规范和技术措施。     

日本开发冲片加工性和磁性优良的高速高效马达用电工钢板

介绍了日本开发的冲片性能、机械性能和磁性能优良的高速高效电机用电工钢板。为了获得这种电工钢板,需要添加Cr、Sb和Sn。将杂质元素C、N的总量控制在0．01％以下,且两者分别降低到0．005％以下时。可使所制造的电机效率达80％以上。     

The effect of rippled graphene sheet roughness on the adhesive characteristics of a collagen–graphene system

A great amount of effort has been made in order to reach a more precise understanding of the adhesion phenomenon that happens as a vital component of several biological systems. Therefore, a firm understanding of the important factors that influence this phenomenon is of special importance in triggering the adhesive characteristics of different biological, bio-inspired and synthetic materials in fields such as tissue engineering.In this study the adhesive characteristics of a multi-material system consisting of the frequently used synthetic material, graphene, in the form of armchair-configuration sheets, and an important biological filament which is type 1 Collagen consisting of 3 alpha helices, has been studied in detail. The main emphasis of this study is placed on understanding the effects of the roughness characteristics of the inorganic elements which are the graphene sheets on the overall adhesive features of the system which are quantified within the framework of two main criteria: adhesion energy and peeling force. At first, the methodology used in order to obtain graphene sheets with various roughness values is described in detail. The abovementioned criteria are then evaluated through Molecular Dynamics (MD) modeling of the system in the NAMD simulation software environment and various simulation scenarios are studied.     

定向拉伸对有机玻璃性能的影响

介绍了定向拉伸的原理,从工艺角度阐述了定向拉伸对有机玻璃性能的影响。     

Mg2+-doped Na3V2(PO4)3/C decorated with graphene sheets: An ultrafast Na-storage cathode for advanced energy storage

NASICON-type Na₃V₂(PO₄)₃ is one of the most promising cathode materials for sodium-ion batteries, delivering about two Na⁺-ions extraction/insertion from/into the unit structure. However, the low electronic conductivity which leads to bad rate capability and poor cycle performance, limits its practical application for sodium-ion batteries. To overcome the kinetic problem, we attempt to prepare the carbon-coated Na₃V₂(PO₄)₃ nanocrystals further decorated by graphene sheets and doped with Mg²⁺ ion via the two steps of sol-gel process and solid-state treatment for the first time. Such architecture synergistically combines the advantages of two-dimensional graphene sheets and 0-dimensional Mg²⁺-doped Na₃V₂(PO₄)₃/C nanoparticles. It greatly increases the electron/Na⁺-ion transport kinetics and assures the electrode structure integrity, leading to attractive electrochemical performance. When used as sodium-ion batteries cathode, the hybrid composite delivers an initial discharge capacity of 115.2 mAh g⁻¹ at 0.2 C rate, and retains stable discharge capacities of 113.1, 109.0, 102.4, 94.0 and 85.2 mAh g⁻¹ at high current rates of 1, 2, 5, 10 and 20 C rate, respectively. Thus, this nanostructure design provides a promising pathway for developing high-performance Na₃V₂(PO₄)₃ material for sodium-ion batteries.     

Calculation of film stress from pitch measurements in LCD panel manufacturing

A method based on inverting a finite element model is presented for determining film stress from pitch changes before and after a film deposition step in liquid‐crystal display panel manufacturing. It differs from the conventional methods by making use of in‐plane deformation rather than out‐of‐plane measurements to calculate film stress. The resulting film stress is confounded with glass structural relaxation. Measurements of out‐of‐plane deformation at the edge of the sheet can be used with the pitch measurements to separate the effects of glass structural relaxation and film stress.     

基于Drupal 7的HTML5布局模板的二次开发

以目前在国外广泛应用的Drupal 7为应用开发框架,结合HTML5、样式表、动态脚本和第三方插件技术,通过在WAMP平台上对Drupal进行二次开发,设计了一套具有友好界面、易添加与删除容器,并动态加载数据的布局模板.该模板采取分层设计,从根容器到目标内容容器构建页面框架;采用HTML5自适应布局设计方法,针对不同的业务需求完成个性化定制界面UI.同时介绍了利用主流浏览器调试工具对界面代码进行分析与调试.     

高强度钢板在汽车车身上的应用及问题对策

主要介绍高强度钢板使用量增加背景、已开发或正在开发的种类、高强度钢板在汽车车身上的应用以及高强度钢板使用中存在的主要问题及其对策等。