信息物理融合系统数据中心能量消耗模型研究

从信息物理融合系统的角度考察数据中心,对包含信息技术系统和冷却系统的数据中心的能量消耗进行建模。给出信息技术系统中的服务延时约束模型、工作负载约束模型、服务质量约束模型及最终的能量消耗约束模型和冷却系统中的能量消耗模型。模型的建立为研究如何在保证服务质量的同时最大程度地降低能量消耗提供了依据。     

基于OpenStack的计算机实验室自助服务平台的设计与实现

随着越来越多的实验课程在计算机实验室开展,共享与个性化的矛盾受到人们的关注。为满足教学个性化的需求,设计一个基于开源云计算技术的自助服务平台,可以给每个学生的每门课程分配一个独立的实验环境。实验证明,本方案具有可行性,能够降低管理工作的强度,改善实践教学的条件。     

物联网—概念与关键点

物联网是一个新兴产业,也是研究热点,对它的研究认识目前还处于起步阶段。文中通过对相关文献的深入研究,在对目前关于物联网概念的主要观点进行归纳总结的基础上分析阐述了物联网的概念和正确认识物联网所涉及的有关重要问题,归纳总结了物联网的特征及其与互联网的关系,并在此基础上研究阐述了边缘网设计、物体的规范化标示识别、中间件技术、优化高效的跨媒介协议设计、行业技术的标准化等对物联网技术发展应用有决定性意义的技术关键点。     

基于改进蚁群算法的WSN路径优化

针对无线传感器网络(WSN)路径优化问题,提出一种改进蚁群算法的WSN路径优化方法,结合遗传算法和蚁群算法的优点,在蚁群算法中引入遗传算法选择、交叉和变异算子,提高算法收敛和全局寻优能力。仿真对比实验结果表明,改进蚁群算法提高了WSN路径优化效率和成功率,有效延长了WSN的生命周期,改善了网络整体性能。     

A numerical Green's function and dual reciprocity BEM method to solve elastodynamic crack problems

A computational model based on the numerical Green's function (NGF) and the dual reciprocity boundary element method (DR-BEM) is presented for the study of elastodynamic fracture mechanics problems. The numerical Green's function, corresponding to an embedded crack within the infinite medium, is introduced into a boundary element formulation, as the fundamental solution, to calculate the unknown external boundary displacements and tractions and in post-processing determine the crack opening displacements (COD). The domain inertial integral present in the elastodynamic equation is transformed into a boundary integral one by the use of the dual reciprocity technique. The dynamic stress intensity factors (SIF), computed through crack opening displacement values, are obtained for several numerical examples, indicating a good agreement with existing solutions.     

铝硅合金一次熔炼技术的应用

以高压开关用ZL101A铸件的熔炼工艺为例，介绍了铝硅合金一次熔炼工艺的应用和具体的工艺措施。采用该工艺后，可减少一次铝硅合金的熔炼过程。在降低烧损、节省能源的同时。降低了铝硅合金熔炼的总体成本。     

组播技术在流媒体系统构建中的应用

组播技术是一个日益发展的计算机网络新应用领域。本文在比较当前各种流媒体播放技术的优缺点的基础上,提出并具体实现了一个基于组播技术的流媒体播放系统。     

Ballistic impact: The status of analytical and numerical modeling

Simulation of ballistic impact generally falls into one of two categories: analytical models which assume certain dominant physical phenomena and numerical simulations, where the general continuum conservation equations are integrated in time at all points in a spatial mesh to obtain the spatial time history of stresses, strains, velocities, etc., in the projectile and target. Analytical formulations model the mechanical processes over the full field of influence which leads to approximate conservation equations for the entire region in an impact event. These for mulations have met with considerable success so long as the assumptions inherent in the model are applicable. Numerical simulations (hydrocodes) compute the wave (shock) interactions important at early times. Mechanical effects, e.g. plugging, erosion, etc., require realistic constitutive modeling which includes failure criteria and failure propagation. This paper gives a broad overview of both analytical and hydrocode modeling and examines the technical issues, uncertainties and potential diffuculties for advancement in predictive capability.     

聚苯乙烯接枝聚丙烯酸丁酯乳液改性水泥砂浆的性能及微观结构分析

合成了聚苯乙烯(PS)接枝聚丙烯酸丁酯(PBA)乳液(PS-g-PBA),并将其用于改性水泥砂浆,考察了PS-g-PBA乳液含量及PS与PBA的质量比对改性水泥砂浆的减水率、流动度、力学性能以及毛细孔吸水率的影响.结果表明,3种水泥改性剂的减水效果优异,减水率的极大值为56.7％,改性水泥砂浆的毛细孔吸水率下降明显,其...     

硅橡胶模具制作及浇注工艺的探讨

阐述了硅橡胶模具的制造方法和步骤,并对制作硅橡胶模具时,母样在模具中的放置、浇注系统设计、排气孔设计及制件浇注工艺进行了探讨总结,对保证制件成品率具有一定应用价值。