PET-POY热处理后的动态力学特性

对PET-POY进行热处理后,采用动态力学、密度梯度、双折射等实验方法,研究了其动态力学性能和结构变化,结果表明:随着热处理温度的增加,[E]-T曲线上的凹峰消失,E″-T曲线上的双峰变成一个峰。双折射、结晶度和声速取向因子随处理温度的增加而增加,双折射值与结晶度呈现直线关系。     

一种异地库房管理中远程数据维护方法的研究与应用

介绍了在异地库房管理中，采用C／S结构和远程数据库访问技术等实现的对远程数据维护的一种方法。通过该方法开发的远程数据传输系统，实现了远程客户端对服务器的通信，完成了远程数据在后台服务器的集中管理和服务器对远程数据的格式、类型等的控制，同时保证了远程客户端对服务器操作的并发性，客户端数据和服务器数据的完整性、安全性以及远程客户端数据与后台服务器数据的一致性，有效地维护了远程数据。该系统已成功运用于库房管理之中。     

Dynamic Survivability in WDM Mesh Networks Under Dynamic Traffic

Network survivability is a crucial requirement in WDM mesh networks. In this paper, we systematically consider the problem of dynamic survivability with dynamic single link failure in WDM networks under dynamic traffic demands. Specifically, we investigate various protection schemes, such as dedicated path protection (DPP), shared path protection (SPP), dedicated link protection (DLP), shared link protection (SLP), and two restoration schemes, path restoration (PR) and link restoration (LR). Moreover, two new shared protection methods are proposed, i.e., SRLG-based shared link protection (SRLG-SLP) and SRLG-based shared path protection (SRLG-SPP). The SRLG (shared risk link group) constraint defines the availability of protection resources to a working path, which requires that any two working paths sharing the same risk of failure (or in the same SRLG) cannot share the same protection resources. Furthermore, in our study, we consider a more practical dynamic single-link failure model, in which the link-failure-interarrival time and link-failure-holding time are considered as two independent parameters. Based on this link-failure model, extensive simulations are done to analyze and compare the dynamic survivable performance of various protection and restoration schemes. Resource utilization, protection efficiency, restoration efficiency, and service disruption ratio are employed as survivable performance metrics versus traffic load, link-failure frequency, and link-failure reparation time to evaluate the survivable performance. Many meaningful results are given. In addition, we show that the developed SRLG-SLP and SRLG-SPP protection schemes perform very well in terms of protection efficiency and service disruption ratio, while sacrificing some performance in terms of resource utilization.     

野战手术床的CAD设计

介绍在Solid Works平台上建立野战手术床(以下简称手术床)参数化实体建模的基本方法和关键技术，以及利用动画设计软件IPA进行动态模拟，节省了设计时间，提高了设计质量。     

Electrocatalytic hydrogenation of cyclohexanone: Simple dynamic cell design

The electrocatalytic hydrogenation of cyclohexanone has been investigated with catalytic powder particles made of metal nanoaggregates deposited on a nonconductive material such as activated carbon and alumina. The catalytic powder particles were suspended in the solution under vigorous stirring conditions. The brief contact of the powder particles with a porous carbon cathode was sufficient to form adsorbed hydrogen on the metallic nanoaggregates through water electrolysis and initiate the electrohydrogenation process. It is demonstrated that the key parameters of the electrohydrogenation process are both the nature of the metallic nanoaggregates and the nature of the non-conductive material. The hydrodynamics of the solution under vigorous stirring conditions have also been studied for the particular cell used in the present study.     

基于高速摄像的ESPI全场动态特性测量

采用高速摄像与ESPI技术相结合,将运动中的被测物位移随时间变化的状态以序列图像的形式实时记录,并运用图像处理技术,成功地实现了ESPI动态测量。测量了悬臂梁的自由振动过程,获得了悬臂梁的振动周期、振动频率和阻尼系数等动态特性,实验结果与理论计算值相吻合。     

某热电厂冷却塔地基沉降变形的原因分析

针对某热电厂冷却塔地基沉降变形所出现的问题,该文从勘察资料入手,结合工程设计要求、施工情况以及检测成果找出了造成冷却塔产生不均匀沉降的原因并对此原因进行了对比分析,得出了许多有益的结论。为以后地基的补强加固找出了根据。对类似工程具有借鉴意义。     

基于概念网络的文本信息监控技术

由于网上信息的迅速增长,文本信息监控已经成为网上信息管理中的热点研究课题。本文在模糊集和语义网络的理论基础上,构建了模糊值动态约束性概念网络,介绍了该概念网络的基本构建方法,并提出了基于概念网络的文本分析算法。     

Characterization of resol resins modified by the addition of PVC plastisols

Plastisols, which are a blend of poly(vinyl chloride) resin and a plasticizer (DEHP), were used as a toughening agent of a resol resin in order to improve the mechanical properties. It was not possible to formulate resol blends by adding more than 10 % of plastisol owing to a lack of apparent homogeneity in the systems, which also showed many air bubbles. The relationship between dynamic mechanical, mechanical and thermal properties and the amount of plastisol added was studied. It was determined from the infrared spectroscopy and dynamic mechanical results that the resol–plastisol blends seem to be formed by a reaction between the phenol and PVC giving a higher crosslinked structure. An improvement in the thermal resistance of the blends at lower temperatures was observed with an increase in the percentage of plastisol. Flexural analysis showed the elastic behaviour of the systems. However, it was not possible to observe the effect of the plasticizer (DEHP) owing to the low quantity of plastisol that was added to the resol. Copyright © 2004 Society of Chemical Industry     

水轮发电机转子动平衡的时-频方法

提出了一种基于时域分析和频域分析的动平衡方法，应用于水轮发电机转子的动平衡。在这种时-频动平衡方法中，用时域分析来确定不平衡力的相位，用频域分析来确定不平衡力的大小。该方法具有平衡精度高、起机次数少的优点。用1台300MW水轮发电机转子的现场试验数据验证了该方法的准确性和适用性。