表面活性剂和硝酸铵作用机理的研究

叙述了采用光电子能谱,X射线衍射等技术,对胺类表面活性剂在硝酸铵晶粒表面作用机理的系统研究。分析了含有胺类表面活性剂的硝酸铵具有良好抗结块性的原理,为表面活性剂在硝酸铵和硝酸铵炸药中的应用提供了理论依据。     

基于DIS的视景仿真交互行为研究

分布式交互仿真是分布式仿真与图形特性的有机结合。针对分布式视景仿真的交互行为特性,文章作了相应的研究,分析了分布式交互仿真DIS节点间交互操作的信息传递机制和通信格式,并结合图形特性论述。在分布式视景仿真中结合对象建模对仿真节点间的实体交互行为做出理论分析,并在此基础上提出了用于实时态势仿真的软件平台和实现方法。     

BetweenIT: An Interactive Tool for Tight Inbetweening

The generation of inbetween frames that interpolate a given set of key frames is a major component in the production of a 2D feature animation. Our objective is to considerably reduce the cost of the inbetweening phase by offering an intuitive and effective interactive environment that automates inbetweening when possible while allowing the artist to guide, complement, or override the results. Tight inbetweens, which interpolate similar key frames, are particularly time‐consuming and tedious to draw. Therefore, we focus on automating these high‐precision and expensive portions of the process. We have designed a set of user‐guided semi‐automatic techniques that fit well with current practice and minimize the number of required artist‐gestures. We present a novel technique for stroke interpolation from only two keys which combines a stroke motion constructed from logarithmic spiral vertex trajectories with a stroke deformation based on curvature averaging and twisting warps. We discuss our system in the context of a feature animation production environment and evaluate our approach with real production data.     

基于PLAXIS3D的地基基础-上部结构共同作用分析

以某多层框架结构为工程背景,通过PLAXIS 3D有限元程序构建包含上部结构与地基基础的三维数值模型,借助程序内嵌的弹塑性分析功能;首先,采用SAP2000建立结构有限元模型,在PLAXIS 3D中采用与其相同的底部约束条件,对比仅考虑自重作用时两模型中结构内力的差异,验证PLAXIS 3D进行框架结构内力分析的计算精度;然后,分别考虑小震与大震两种工况,采用拟静力方法,对结构施加水平地震力,研究土-结构共同作用下结构内力与不考虑共同作用时结构内力的差异性;最后,除PLAXIS3D整体模型之外,考虑将上部结构简化为均布荷载,分析两种情况下基础沉降的差异性。结果表明,建立土体与结构的整体三维模型可以直接考虑地基基础与上部结构的刚度协调,从而获得更加符合实际的结构内力和基础变形。     

从最新绿建标准看BIM的应用与发展

本文从最新的《绿色建筑评价标准》入手,对BIM在绿色建筑的应用点进行了细致的对比分析,然后选取了四个重点应用进行全面立体的阐述,最后结合最新的国家政策,对绿色建筑的发展方向进行了合理的展望,提出了以绿色建筑为核心的建筑工业化建造模型,具有很强的可操作性和指导意义。     

基于人机交互的语言训练中微信小程序开发设计研究

以微信小程序开发过程为个案,研究一种基于人机交互的涉及到交际语言训练功能的微信小程序开发设计过程.对微信小程序开发工具包和开发平台进行分析,实现在交际语言训练过程和人机交互功能的加强开发.该开发过程在推送精度和用户满意度方面均获得较强的数据表现.认为该开发模式适用于该个案的开发需求.     

电力系统稳定器配置的一种新方法

在应用正则形理论的基础上,提出了计及二阶模式非线性相关作用的电力系统稳定器的配置方法。从识别强非线性下系统主导低频振荡模式出发,寻找与主导低频振荡模式相关的模式,利用非线性相关性来确定与这些模式联系最紧密的状态变量和相关发电机,以此为据来确定电力系统稳定器的配置。八机系统的算例结果都验证了在这些新观点指导下进行电力系统稳定器配置方法的有效性。     

Rheological investigation of alginate chain interactions induced by concentrating calcium cations

Chain interactions of sodium alginate during its gelation were investigated by a new gelation method which was based on a Ca²⁺-concentrating gelling process (CCGP) produced by water evaporation of an alginate solution containing CaCl₂. For two commercially available sodium alginate samples (low viscosity (LA) and medium viscosity (MA)) having different molecular weight distributions but the same G/M blocks, the critical Ca²⁺ concentrations for their gelation were found to be 4.6 (for LA) and 4.5 (for MA) μmol/mL after evaporating water from 1% of alginate solutions containing 4 μmol/mL of CaCl₂. The CCGP gelation method for alginate under the above conditions were confirmed by rheological measurements and the observed highly ordered and uniform mesh structure of the CCGP-formed alginate gels shown in cryo-SEM images. Combinations of LA and MA at different ratios (0:4, 1:3, 2:2, 3:1, 4:0 on weight basis) were studied using the CCGP gelation method to further the understanding of the alginate chain interactions during gelation. Different LA/MA mixtures exhibited different rheological properties in either non-gelled or gelled systems, indicating that the molecular weight distributions of the sodium alginates influence the alginate chain interactions mediated by Ca²⁺. Thus, an appropriate combination of LA and MA is required for a strong alginate interchain interaction during CCGP, and alginate products with desirable characteristics can be produced by manipulating the mixing ratios of sodium alginates having different molecular weight distributions even at the same total composition and distribution of G/M blocks.     

合理运用多媒体技术优化组合教学设计

多媒体技术及网络教育的发展给创新教育注入了活力。但要达到预期目的 ,在运用多媒体技术优化组合教学设计时 ,应注意界面设计合理 ;把握最佳作用点 ,启发讨论 ;突出交互作用 ;注重与传统方式教育的协调。     

Interaction of magnetic spheres in magnetic fields from the view of magnetic energy density: A 3D finite element analysis(FEA)OA

Magnetic interaction between magnetic particles is of great significance in the fields of magnetic separation and functional materials. A good understanding of interaction mechanism of magnetic particles would further boost its promising industrial applications. We hereby present our work which visualizes the movement behavior of magnetic spheres in magnetic fields employing high-speed imaging and simulates the dynamic behavior of spheres using an Arbitrary Lagrangian-Eulerian(ALE) based on fini...