Topology and Stability of Trivalent Polyhedral Clusters

An algorithm to generate the molecular graphs of the trivalent clusters is presented. All the polyhedral trivalent cages with 4-16 vertices are enumerated, with particular attention being given to their symmetry, spectra and stability. The relative stability of isomers is not decided solely by their symmetry. A new kind of spectral phenomenon is reported. This is the occurrence of graphs having the same HOMO-LUMO gap, the same E and the same even-order moments. We refer to it as 'pseudo-isospectrality'.     

基于CAN总线的汽车测试解决方案

更高功能的汽车设计带动更复杂的汽车电子测试技术的发展。中国的汽车测试界尤其面对着设备的短缺、技术的匮乏等诸多困难。本文针对中国的汽车电子测试业。介绍了一种集成的软硬件同步平台。它基于CAN总线领域中的PXI总线。及国际广泛应用的测试管理TestStand软件。构建成高集成度、可靠性、升级维护方便、开放彻底的测试系统。     

模糊规划在炼油厂生产计划优化中的应用

生产计划的编制是炼油化工企业生产经营管理中的一个关键环节，然而由于市场变化的不确定性，使得企业的长远规划制定受到限制，笔者将模糊数学应用于炼厂生产计划的编制，通过模糊规划对炼油企业生产计划进行优化，使编得的生产计划在一定程度上反映市场的变化并使企业的生产效益最优，为企业管理决策者进行长期规划给予指导，给出了实例来说明该方法的可行性。     

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可燃气体在运输、储存、加工和使用过程中，因可燃气体泄漏而形成的气云爆炸事故，常常会造成巨大的人员伤亡和财产损失。研究气云爆炸的特性和威力，可防范事故，减小损失。中采用有限差分方法编制了求解可燃气云爆炸过程的定解方程的数值模拟程序。方程组中的源项由能量均匀加入法处理，爆炸场中的间断问题通过人工黏性模型处理。经开敞空间乙炔——空气气云爆炸实验结果检验，数值计算结果的偏差在13％以内。计算结果表明，气云半径越大，爆炸最大压力和压力增加速率越大；气云爆热越大，爆炸最大压力和压力增加速率越大。     

Analysis of Resolution of Bistatic SAR

In this paper, the spatial resolutions at different directions of bistatic synthetic aperture radar （BiSAR） have been derived from the ambiguity function. Compared with monostatic signal to noise ratio, BiSAR＇s resolutions of a fixed point target are varying with slow time since BiSAR system is space-variant. Constraints for the assumption of space-invariant bistatic topology are proposed in the paper. Moreover, under the assumption of invariance, the change of resolutions at different point in the image scene is taken into account, and we have specified two key parameters that affect resolutions directly and analyzed the way how they influence on the resolutions.     

电信运营商网络管理系统全新数据展现方案

从1997年中国电信开始97系统建设起，各个运营商相继建立了自己的运营支撑系统（OSS）。运营商的OSS系统一方面作为生产系统，满足日常运雏的工作需要；另一方面作为展现运维水平的窗口，需要在OSS的呈现部分提供更好的界面效果以吸引用户及大客户，为运营商带来更多的价值。微软下一代客户端展示技术——Windows展现架构（WPF）提供了强大的用户界面展现能力，可以为OSS系统提出的新数据展现需求提供良好的解决方案。     

WCDMA软切换的下行发射分集与功率控制策略

分别介绍了传统软切换分集方式、单基站选择分集传输方式（S-SSDT）、多基站选择分集传输方式（M-SSDT）、基站独立分集传输方式（SIDT）等几种发射分集策略，并探讨了相应的下行功率控制方案。     

循环流液相等电聚焦方法及应用研究

利用循环流液相等电聚焦技术，对Ｈｂ、Ｃｙｔ．Ｃ和ＢＳＡ混合物进行分离，对ＲＮａｓｅＡ粗制品进行精制。该方法上样量大，活性回收好。对聚焦过程中扩散、对流和电渗的影响进行了讨论。     

A study on the anodic protection of Titanium evaporators in Al2(SO4)3 solution

The feasibility of the anodic protection of titanium evaporators in Al₂(SO₄)₃ solution was studied by the measurement of polarization curves, weight loss, solubility of passive film and AC impedance. The protection parameters and efficiency were determined. In addition, the practical technology of anodic protection was studied by screening reference electrodes and auxiliary cathodes. Throwing power was also measured. Four rows of tube-type evaporators of titanium have been anodically protected in situ. Field tests lasting more than one year show satisfactory results.     

Influences of artificial pre-stressing on ply stresses and tensile properties of Vinylon fibre-reinforced aluminium laminates (VIRALL)

A simple micromechanical model based primarily upon the rule-of-mixtures is developed which allows prediction of the effects of fibre preload on the ply stresses (i.e., the initial residual stresses of fibre, adhesive and matrix) induced within VIRALL laminates, and the tensile stress-strain curves and mechanical properties of VIRALL laminates. The analysis of the ply stresses of VIRALL laminates indicates that pre-stressing will dramatically influence the ply stresses. The predicted tensile stress-strain curves of VIRALL laminates are in good agreement with the experimental curves and the results show that the stress-strain curves of VIRALL laminates move upwards when the prestress increases. The predicted tensile mechanical properties of VIRALL laminates at room temperature show good agreement with those obtained experimentally; both show that prestress can improve the tensile properties (i.e., elastic limit strength, 0.2% yield strength and failure strength) of VIRALL laminates.