纳米材料的产业化

纳米材料有着广泛的用途和巨大的市场，人们一直在力图寻求一种批量低价生产这种材料的方法，纳米相技术公司（Nanophase Technolgies Corp.）花费数年时间开发出一种工艺，即物理气相合成法（PVS）生产纳米材料。之后，公司大大改进了该工艺，使产品产量以及产品纯度大为提高，随后，公司又开发出了离散粒子封装法（DPE），用这种方法可以在纳米粒子的表面产生聚合物膜，使得产品的表面性质能迎合不同用户的需求，最后，介绍了几种采用该公司的新技术生产的产品。     

The Positive Magnetic Susceptibility for Rb3C60 Superconductor and the Differential Paramagnetic Effect

AC magnetic susceptibility of Rb₃C₆₀ superconductor as a function of temperature was measured in an applied static magnetic field perpendicular to the AC magnetic field. The peaks in real part of AC susceptibility curves located in the transitional temperature indicate that there may exist the differential paramagnetic effect (T) = dM/dH > 0 in the specimen. The amplitude of the peak and the temperature of diamagnetic onset are proportional to intensity of the applied field, and upon cooling the peaks occur before the transition temperature of zero field. Through discussing and comparing our experimental result with those reported previously, we have put forward a new opinion on producing condition of the differential paramagnetic effect (DPE).     

Synthesis of well-defined star-branched polymers by stepwise iterative methodology using living anionic polymerization

This article reviews the synthesis of regular and asymmetric star-branched polymers with well-defined structures by methodologies using living anionic polymerization, especially focusing on the synthetic approaches accessible for precisely controlled architectures of star-branched polymers concerning molecular weight, molecular weight distribution, arm number, and composition. The reason for selecting living anionic polymerization from many living/controlled polymerization systems so far developed is that this living polymerization system is still the best to meet the strict requirements for the precise structures of star-branched polymers. Furthermore, we herein mainly introduce a novel and quite versatile stepwise iterative methodology recently developed by our group for the successive synthesis of many-armed and multi-compositional asymmetric star-branched polymers. The methodology basically involves only two sets of the reaction conditions for the entire iterative synthetic sequence. The reaction sequence can be, in principle, limitlessly iterated to introduce a definite number of the same or different polymer segments at each stage of the iteration. As a result, a wide variety of many-armed and multi-compositional asymmetric star-branched polymers can be synthesized.     

一种用于森林防火的无线传感器网络定位算法

利用无线传感器网络进行森林火灾预警和火灾现场定位可以有效预防火灾发生或在其发生后尽早得知其位置.提出了一种基于分簇的DPE定位算法,该算法根据DPE算法的递增思想进行分簇,并同步进行节点定位,从而提高系统定位的准确度和网络的可扩展性以及实时性.仿真结果表明:在允许定位误差小于5 m时,节点定位的准确率可达97%.     

TMN向TINA的迁移

TMN在其发展过程中遇到了一些困难,而新的电信信息组网体系结构能够很好地解决这些问题。文章阐述了TMN向TINA迁移时所必须解决的技术难点,介绍了5种迁移方案,并详细阐述了紧密耦合和松散耦合技术。     

对接机构非线性物理参数辨识方法

采用直接参数识别方法(DPE)由系统的输入、输出数据识别空间对接机构的物理参数:惯量矩阵、阻尼矩阵和刚度系数矩阵。首先建立了对接机构简化非线性动力学方程,然后利用系统已知的对称性和非满阵信息将机构的非线性物理方程变形为参数线性的辨识模型,分别采用同时需要位移、速度和加速度数据的DPE方法和只需要位移数据的四阶差分DPE方法识别机构的物理参数。六自由度对接机构仿真算例验证了两种方法的可行性。     

智能网技术及其发展

本文首先从承担国家“863”计划智能网项目研究的角度,介绍目前智能网的实现技术,然后展望智能网技术的未来发展方向。     

基于DPM/DPE的虚拟施工研究

在建设项目日益复杂的情况下,针对某些复杂工序的方案验证仅通过简单的虚拟施工浏览无法进行有效的论证,通过Delmia的DPM/DPE模块,可以将前端三维表现和后台施工工艺数据库相结合,根据施工模拟方案生成各种分析报告以供施工方案决策分析.     

基于DELMIA的三维数字化制造模式探索与实践

为探索型号产品三维数字化制造模式,基于达索公司DELMIADPE/DPM系统,提出了一种三维数字化制造应用框架。以某零件三维模型为数据源,实现了基于该框架的三维工艺规划、工艺设计仿真验证及生产现场发布。应用表明,该模式对构建三维到工艺、三维到现场的数字化制造体系具有较大的参考价值。