钡酚醛树脂体系化学流变特性研究

在粘度实验和DSC热分析实验的基础上,对用于RTM工艺的钡酚醛树脂体系的化学流变特性进行研究,并根据双阿累尼乌斯方程建立树脂体系的流变模型。模型与实验结果具有良好的一致性。模型可揭示树脂体系在不同工艺条件下的粘度变化规律,定量预报RTM工艺树脂的低粘度平台工艺窗口,为合理制定RTM工艺参数、保证产品质量和实现工艺参数的全局优化提供必要的科学依据。     

防汛应用系统整合与完善的探讨

随着黄委“数字黄河”工程建设的开展以及计算机广域网络的扩大、开发技术运行方式的变化和用户的迅速增长，需要将防汛系统资源进行综合利用，满足业务生产需求。“数字黄河”工程规划完成后．我们根据规划首先选择防汛应用系统为突破口，以防汛会商综合信息支持为目标，将单个的防汛应用系统进行规范、完善，最终建成防汛信息综合平台．在平台的基础上实现现有应用系统和新开发系统的集成。     

常用激光介质膜的斜入射性能

本文给出了多层介质膜反射率与入射角的关系的计算机程序，并列出了部份常用激光膜片反射率-角度曲线。     

Detrended Fluctuation Analysis of the Human EEG during Listening to Emotional Music

A nonlinear method named detrended fluctuation analysis （DFA） was utilized to investigate the scaling behavior of the human electroencephalogram （EEG） in three emotional music conditions （fear, happiness, sadness） and a rest condition （eyes-closed）. The results showed that the EEG exhibited scaling behavior in two regions with two scaling exponents β1 and β2 which represented the complexity of higher and lower frequency activity besides α band respectively. As the emotional intensity decreased the value of β1 increased and the value of β2 decreased. The change of β1 was weakly correlated with the ＇approach-withdrawal＇ model of emotion and both of fear and sad music made certain differences compared with the eyes-closed rest condition. The study shows that music is a powerful elicitor of emotion and that using nonlinear method can potentially contribute to the investigation of emotion.     

Bandwidth‐guaranteed QoS routing of multiple parallel paths in CDMA/TDMA ad hoc wireless networks

This paper investigates the issues of QoS routing in CDMA/TDMA ad hoc networks. Since the available bandwidth is very limited in ad hoc networks, a QoS request between two nodes will be blocked if there does not exist a path that can meet the QoS requirements, even though there is enough free bandwidth in the whole system. In this paper, we propose a new scheme of using multiple paths between two nodes as the route for a QoS call. The aggregate bandwidth of the multiple paths can meet the bandwidth requirement of the call and the delays of these paths are within the required bound of the call. We also propose three strategies by which to choose a set of paths as the route, namely, shortest path first (SPF), largest bandwidth first (LBF), and largest hop‐bandwidth first (LHBF). Extensive simulations have been conducted to evaluate the performance of the three strategies in comparison with a traditional single path routing algorithm. The simulation results show that the proposed multiple paths routing scheme significantly reduces the system blocking rates in various network environments, especially when the network load is heavy. Copyright © 2005 John Wiley & Sons, Ltd.     

提高模具制造水平 为建设制笔强国而奋斗

一、前言 笔作为一种小商品并不起眼,但是,由于其数量庞大,使用广泛而形成了一个大市场;笔的技术含量并不高,然而,要制造一支符合使用要求的笔,将涉及机械、化工、冶金、电子等等各个方面,因此,某种程度上说,一支小小的笔可以反映一个国家的工业化程度。     

中碱值硫化烷基水杨酸钙的制备及性能研究

介绍了一种碱值达170mgKOH／g以上、硫含量大于3．0％、钙含量大于6．0％的硫化烷基水杨酸钙盐润滑油添加剂的制备过程及其性能。实验中重点考察了促进剂及硫磺加入量对产品碱值及硫含量的影响；通过冷冻蚀刻电镜法观察了含碳酸盐的胶体粒子结构及粒度分布情况；应用凸轮挺校、四球试验机等考察了硫化烷基水杨酸钙盐产品的极压抗磨性能。结果表明，硫化烷基水杨酸钙产品不但具有良好的高温洁净性、抗氧化安定性、胶体稳定性，而且具有突出的极压抗磨性及热稳定性。     

深部调剖驱油交联剂的研究

为提高非均质性严重的地层原油采出率 ,合成了用于聚合物驱油的 4种交联剂 ,并对聚合物种类、用量和其与交联剂组成的体系进行了评价。 4 0℃下铝交联剂凝胶粘度低 ,酚醛树脂交联剂低温下不成胶 ,而有机铬交联剂 (J2 )和有机复合胺 (J3)交联效果好。当选用HPAM/有机铬交联剂 /有机酸交联体系时 ,其中HPAM相对分子质量为 2 1× 10 7,可通过改变体系pH值调节成胶速度 ,pH值 6 5时 ,14 0 0mg/LHPAM和 4 0 0mg/LJ2组成的体系在 4 0℃、30d可形成粘度为12 0mPa·s以上的凝胶 ,且热稳定性好 ,成胶时间能满足现场施工需要。 14 0 0mg/LHPAM和10 0 0mg/LJ3交联剂组成的体系 ,成胶时间长 ,有利于油田深部调剖驱油     

粘接技术在油罐堵漏中的应用

介绍了粘接技术的种类、原理及其技术要领，并引用实例说明了该技术的优点。粘接堵漏技术将成为油罐渗漏维修的一种重要方法。