大功率柴油机连杆三维精细分析

连杆作为柴油机的关键零部件，其刚度和强度对于柴油机的性能和功率的提高起到至关重要的作用。采用MSC／MARC程序及三维多体接触的方法，对G32柴油机连杆的应力场和位移场进行了数值模拟。进而为降低机械负荷、改善应力分布和进一步强化奠定基础。     

Behaviour of ±45° glass/epoxy filament wound composite tubes under quasi-static equal biaxial tension–compression loading: experimental results

The primary aim of this paper is to present results describing in detail the behaviour of ±45° E-glass/MY750 (GRP) tubes, of various wall thicknesses, subjected to equal biaxial tension–compression loading, generated under combined internal pressure and axial compression. The role played by the non-linear lamina shear has also been assessed by comparing various shear stress–strain curves for embedded laminae (extracted from tests on ±45° tubes subjected to circumferential: axial stress ratios SR=1:0, 1:−1 and 2.3:−1) with that of an ‘isolated’ lamina (measured from torsion of 90° tubes). Extracted shear failure strains, for embedded laminae, were more than four fold larger than those measured at ultimate failure for an ‘isolated’ lamina. Soft characteristics were observed in the embedded lamina and these were believed to be due to interaction between early matrix damage initiation (and propagation) and shear. Factors affecting the behaviour of the tubes, such as bulging, scissoring, thermal stresses and stress variation through the thickness are discussed.     

Two Isomers of C60F48: Computed Inter-isomeric Equilibrium

C₆₀F₄₈ has been known to exist in two isomeric forms of D₃ and S₆ symmetries. However, the quantum-chemical calculations have not agreed on their stability order though a near-isoenergetic picture is otherwise always encountered. In order to clarify the situation, the entropy effects are evaluated for synthetic temperatures of about 500K. The entropy evaluations suggest that the D₃ isomer should be more stable in the potential energy by 2.05-2.55 kcal/mol (to which term the ab initio data are closer than the semiempirical ones).     

基于B/S和C/S的高中校园一卡通系统

结合广东潮州高级中学的实际情况,介绍了高中校园一卡通系统的设计和应用.     

数据的VV&C研究

数据的可信性是建模与仿真领域中一个重要的问题。该文首先介绍了数据校核、验证与证明 (VV&C)的基本概念。然后确定了数据VV&C评估的主要策略 :过程模型以及支持数据质量的元数据模板等几方面内容。接着对数据的VV&C和建模与仿真的VV&A的关系作了简要比较。最后举出了一个综合环境评估和检查工具的例子。     

基于PCI总线和DSP技术的生物芯片测控与采集系统

本文在介绍激光共聚焦生物芯片扫描仪结构原理基础上，论述了基于DSP的PC测控采集技术、基于PCI总线的PC与DSP通信技术等关键技术。     

AT91SAM7S64芯片I2C(TWI)接口应用开发

较为详细地介绍AT91SAM7S64芯片的I2C接口控制器中外围数据控制器(PDC)的使用方式,并将其与AT24C04之间的通信作为实例给出完整的应用开发流程和软硬件详细描述。该方法的可行性已经为工程实践和实际产品所证实。该操作也可推广到其他AT91SAM7S系列ARM处理器与其他I2C接口器件间的通信。并对其他拥有外围数据控制器的接口开发有一定的借鉴意义。     

高清晰度电视样机控制子系统的实现

本文提出了基于微处理器AT89C55的国家高清晰度电视样机控制子系统的总体设计方案和软硬件实现方法。目前，该控制系统己顺利完成，并参与北京、上海两地的功能样机测试。     

利用C++Builder 5.0开发原理框图绘图软件

介绍了原理框图各种图形的数据存储方法，利用C^ Builder5.0开发了原理框图的绘图软件，实现了原理框图绘制的基本功能。     

C51嵌套汇编子程序在阻抗测试仪研制中的应用

C51嵌套汇编子程序，充分发挥了两种语言自的优势，介绍了C51调用汇编子程序的接品规则，并通过阻抗测试仪程序开发的例子予以详细说明。