热镀锌钢上锌花的研究进展

由大晶粒组成的锌花是热浸锌镀层有别于其它镀层的显著特征,综述了热镀锌钢上锌花的研究现状,包括锌花的外观形貌、形貌与锌晶体学位向的关系、合金添加剂的作用以及锌花对热浸锌镀层腐蚀性能和力学性能的影响.从过冷度、晶体学位向和润湿作用3个方面论述了锌花的形成机制.     

Best tracking and regulation performance under control energy constraint

This paper studies optimal tracking and regulation control problems, in which objective functions of tracking error and regulated response, defined by integral square measures, are to be minimized jointly with the control effort, where the latter is measured by the plant input energy. Our primary objective in this work is to search for fundamental design limitations beyond those known to be imposed by nonminimum phase zeros, unstable poles, and time delays. For this purpose, we solve the problems explicitly by deriving analytical expressions for the best achievable performance. It is found that this performance limit depends not only on the plant nonminimum phase zeros, time delays, and unstable poles-a fact known previously-but also on the plant gain in the entire frequency range. The results thus reveal and quantify another source of fundamental performance limitations beyond those already known, which are nonexistent when only conventional performance objectives such as tracking and regulation are addressed without taking into account the control energy constraint. Among other things, they exhibit how the lightly damped poles, the anti-resonant zeros, as well as the bandwidth of the plant may affect the performance.     

边界点集规划与注塑模具浇口位置的优化

根据平衡流动路径特点，提出了以理想流动模式为目标、基于制件边界几何信息的浇口位置优化选取的原则；并以平板制件单浇口注射成型工艺为例，研究了最佳浇口位置的描述方法并建立了相应的数学模型，给出了优化算法及制件边界特征点集的规划提取方法；根据所建数学模型和所选用优化计算方法，开发了相应的计算软件，经实例验证，算法和模型可靠。     

提高虚拟空间会议系统服务质量QoS的若干技术

虚拟空间会议系统是视频会汉系统发展的最高形式．本文结合作者研究工作，通过分析与视频会议系统服务质量相关的技术，提出了基于VST系统的相关技术策略，这些策略能够有效地提高VST系统的服务质量．     

一种基于CORBA的分布式全文检索系统设计

海量信息的全文检索是人类获取信息的重要手段之一,而网络海量信息的检索使传统的全文检索技术面临新的挑战。如何改善检索系统的结构,提高检索系统的性能和效率,以加快检索速度,成为一个值得研究的课题。公用对象请求代理体系CORBA技术的出现为这一课题提供了一个有效的解决方法。该文在对WEB计算方式和CORBA体系进行详细讨论的基础上,结合实际课题的研究,给出了一种基于CORBA技术的分布式全文检索系统架构设计。     

高强混凝土T形截面双向压弯构件承载力的研究

对9根T形截面高强混凝土双向压弯构件进行试验研究,揭示了这类构件的破坏形态,并进一步分析T形截面正截面承载力的变化规律.     

易染性共聚醚酯热氧化稳定性研究

分析了高聚物的氧化裂解机理及抗氧化剂的作用原理。选择了对提高共聚醚酯的热稳定性较为有效的复合抗氧化剂，用测定该共聚醚酯的特性粘度和端羧基含量改变的方法来表征分子量的变化，证实了抗氧剂的作用机理和复合抗氧化剂之间的协同效应     

CIMS中信息建模原则及一种面向对象的建模方法和实现

该文讨论了ＣＩＭＳ中信息建摹基本原则，结合一个实例阐述了一种面向对象建模的方法，该方法可以完整描述地系统的动、静态特性，实现管理系统和工程系统的信息集成。     

A Unified Theory of Uncalibrated Stereo for Both Perspective and Affine Cameras

This paper addresses the recovery of structure and motion from uncalibrated images of a scene under full perspective or under affine projection. Particular emphasis is placed on the configuration of two views, while the extension to $N$ views is given in Appendix. A unified expression of the fundamental matrix is derived which is valid for any projection model without lens distortion (including full perspective and affine camera). Affine reconstruction is considered as a special projective reconstruction. The theory is elaborated in a way such that everyone having knowledge of linear algebra can understand the discussion without difficulty. A new technique for affine reconstruction is developed, which consists in first estimating the affine epipolar geometry and then performing a triangulation for each point match with respect to an implicit common affine basis.