基于网格技术的下一代电信网络架构与运作模式

首先详细介绍了基于网格技术的下一代电信网络架构及其应用．然后探讨了在此基础上的新运营模式．并讨论了引入网格技术对电信运营模式的影响。     

金属Be真空出气性能的测试

利用四极质谱计测试了国产金属铍材在 10 0℃～ 6 0 0℃不同温度下的真空出气成分及相对含量 ,实验得出铍的大量出气主要在温度 4 0 0℃～ 5 0 0℃之间 ,其放出气体的主要成分按放气量大小依次为H2 O ,CO2 ,N2 ,CO ,Ar和H2 ,利用限流小孔半定量的计算了铍材的出气量。     

宏蜂窝模型的传播模型校正研究

详细介绍了 宏蜂窝传播模 型校正的基本操作流程 结果分析及注意事项 对工程 ,人员了解和开展模型校正工作有一定的指导作用 。     

铍铜电极在接触类焊机上的应用研究

接触焊用电极材料是接触类焊机的核心部件，要求具有优良的导电率，强度和高的耐高温性能（软化温度）等综合性能，本项目采用含铍多元铜合金，利用含铍铜合金具有较高的硬度，耐高温性能，强度和导电率的综合性能，研制出一种达到进口电极性能要求的长寿命新型电极材料，通过在进口及国产设备使用完全满足要求，解决了国产焊接电极长期存在的焊接质量差，寿命短的问题。     

步进电机在红外系统扫描机构中的应用

介绍了在红外系统中，采用步进电机作为扫描机构驱动元件，以Ｄ／Ａ数模转换器作细分方式的定频脉宽调制驱动方式，实现微机控制下的扫描机的构步距均匀稳定，满足红外系统分辨率的要求。     

Development of a heterogeneous microstructurally based finite element model for the prediction of forming limit diagram for sheet material

A heterogeneous finite element model with randomly distributed inhomogeneities has been developed for the determination of the forming limit diagram (FLD) for thin aluminum sheet material based on the prediction of localized necking. The strength difference between the inhomogeneities and the matrix is ascertained either from the fluctuation of the experimental stress-strain curve or from a micromechanical analysis that uses a representative particle field. By changing the specimen geometry and friction conditions, different stress states (or strain paths) are achieved. A plot of the critical Oyane fracture parameter is used to identify the limit strain state. Also, a plot of equivalent plastic strain rate is used to distinguish the boundary of intense shear bands and hence to identify where to take the measurement point. Both a plane stress model and a three-dimensional (3-D) model are adopted to predict the shear banding phenomenon and hence the FLD. The predicted FLD agrees well with the measurements from a recent round robin experimental FLD involving several independent research laboratories. The Taguchi method is applied to assess how the various parameters involved in the heterogeneous model affect the calculated forming limit strain.     

Phase Transition VO2 Thin Films for Optical Switches

This paper presents a method to make vanadium dioxide (VO₂) crystallites on silicon substrates by reactive ion beam sputtering. The thickness of the thin film is about 100nm. The phase transition temperature of VO₂ is 65°C. The transmittance of the semiconducting phase VO₂ is about 50% and it is reduced to as low as 3% in metal phase at the infrared wavelenghth spectrum. The extinction ratio of the optical switches is 12dB. and the insertion loss is of 1-2dB. The switching time is about 1ms.     

圆柱体平板镦粗应力场的有限元分析

应用刚粘塑性有限元法对圆柱体在两平板间镦粗时的应力场进行了分析 ,给出了毛坯在不同初始高径比时的心部应力随压下量的变化曲线。由此得出 :在变形过程中 ,圆柱体心部存在两向拉应力 ;并且在墩粗过程中 ,当瞬时高径比约为 1 .0时 ,心部σθ、σr 由拉应力转变为压应力。     

基于LSTM的电力暂态稳定在线评估及预测研究

电网规模的扩大使得电力系统运行状态变得更加复杂,对电网安全稳定运行提出了更高要求。提出了基于深度学习中长短时记忆（long-and-short term memory,LSTM）的电力暂态稳定在线评估模型。该模型通过获取全网各节点电压、电流、功率等电气量,实时计算得到电网失稳可能性评分,并在新英格兰10机39线系统上对该模型进行测试与优化。实验结果表明,该模型能通过实时运算得到电网稳定性的评估及预警,具有准确性高、预警能力强、支持在线监测的特点。     

批评要讲究方法

约翰·卡尔文·柯立芝于1923年当选为美国总统.这位总统以少言寡语而出名,常被人们称作"沉默的卡尔文",可是,他处理起问题来却是相当圆滑. 柯立芝有一位非常漂亮的女秘书,但她工作经常出现差错.一天早晨,他看见女秘书走进办公室,便对她说:"今天你穿的这身衣服真漂亮,正适合你这样年轻漂亮的小姐."女秘书受宠若惊,柯立芝接着说:"但你不要骄傲,我相信你处理的公文也能和你一样漂亮."果然从那天起,女秘书处理公文时很少出错.