Aerodynamic investigations for the tender design concepts of the Øresund cable-stayed bridge

For the Øresund link project two alternative tender designs were proposed, one single-level box girder solution and a double-level truss girder solution. Aerodynamic investigations, comprising wind tunnel section model tests as well as full-scale predictions, were carried out for the cable-stayed part of the two design alternatives. The section model tests covered static and dynamic tests for various configurations of bridge deck equipment, aiming at the detection of possible instabilities or vortex shedding effects and recording of the buffeting response. Cross-sectional admittance functions and aerodynamic derivatives have been estimated, and employed for full-scale predictions of dynamic displacements at a chosen value of the characteristic mean wind speed.     

ZD3075新型等厚筛机的设计与研究

从等厚筛机理论入手 ,论述了ZD3 0 75新型等厚筛机的优点 ,并对该类型筛机的结构进行了可靠性、合理性分析。从理论和实践两方面论证了新型等厚筛机的结构、生产率、筛分效率等各项指标都领先于普通等厚筛分机械     

高强快干稳定淀粉粘合剂的研制

介绍一种高强快干稳定淀粉粘合剂的制备方法，并对其配方和工艺进行了讨论，通过比较，其经济和技术指均优于同类产品。     

军用包装箱扩大树种环境试验研究

通过对我国森林资源丰富的浙江马尾松、福建马尾松、云南松与东北红松制作的军用包装箱在四川江津、海南万宁、黑龙江漠河试验站的库内、棚下长期贮存试验，对比考核典型气候对其包装防护性能的影响，结果表明：三种马尾松代替红松作为枪械、弹药包装箱用材在技术上可行，拓宽了我国军用包装箱用材的树种。     

不同结构盒栅式电子倍增器模拟计算

利用CST三维电磁仿真软件对不同结构的盒栅式电子倍增器进行建模,采用控制变量的分析思想,模拟计算不同打拿极结构下的电子倍增器内电场分布、电子运动轨迹和倍增增益。数值仿真结果显示,不同结构打拿极电子倍增器内部电场稍有不同,并且导致倍增效益有所不同。在具有相同路径的8级打拿极结构的情况下,增益效果由强到弱的顺序为多边形、方形、弧形、三角形。多边形打拿极在二次电子发射材料镀膜区域不同的情况下,电子倍增器的增益效果具有很大的差异。     

视频点播在网络应用中的问题及对策

通过对视频点播系统概念、原理、组成、功能和应用现状的介绍,分析了视频点播系统在实际应用中的前景及其存在的问题,并提出了解决问题的建议。     

虚拟场景中碰撞检测实用算法研究

碰撞检测是虚拟系统中的一项关键技术,也是提高虚拟系统现实感的一个重要因素。许多算法对碰撞检测的精度进行了研究,但对一个大型的虚拟场景,碰撞检测的范围则是影响仿真速度的主要因素。该文在包围盒检测技术研究的基础上,根据大型虚拟场景的特点,提出了碰撞发生的局部性、主动性、相邻性的观点,由此给出了虚拟游览系统中碰撞检测的DS算法,通过在本单位虚拟战场仿真系统的应用及分析表明,该算法对提高虚拟系统的运算效率是非常有效的。     

基于消息机制的自动化黑盒测试方法研究

如何对人机交互频繁的软件如三维CAD软件进行自动化黑盒测试是一个富有挑战性的研究课题。基于Windows消息机制提出一种针对图形用户界面软件进行自动化黑盒测试的构造模型,该模型通过拦截Windows底层的各种消息,同时依据相应的流程规约和生成算法将消息序列进行重组,从而派生出大量的测试用例,然后以重构后的衍生消息序列驱动被测试系统自动运行,达到自动测试的目的。实验结果表明,基于该思路构建的测试系统具有良好的测试效果。     

Validity of Three Measures of Communication for Predicting Relationship Adjustment and Stability Among a Sample of Young Couples.

The goal of this study was to examine whether data from 3 different measures of communication (i.e., self-report, quasi-observational, and observational) can predict relationship adjustment and stability 1 year later when used conjointly in a sample of 62 young couples. The 3 measures of communication were the Communication Skills Test-Revised (CST-R), the Communication Box (CB), and the Demand/Withdraw Pattern Questionnaire (DWPQ). Through hierarchical multiple regression analyses, results revealed that the CST-R and the DWPQ predict both genders' relationship adjustment 1 year later when used conjointly. Logistic regression analyses revealed that none of the measures of communication significantly predicted relationship stability. In conclusion, the combination of the CST-R and the DWPQ appears to be useful for longitudinally predicting relationship adjustment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)