Novel nitrogen‐containing epoxy resin. II. Cure kinetics by differential scanning calorimetry

The isothermal and nonisothermal cure behaviors of a novel nitrogen‐containing epoxy resin (XT resin) were studied by differential scanning calorimetry (DSC). Various kinetic parameters and details of cure process were obtained based on the Avrami theory. The results indicated that Avrami method is suitable for calculating the kinetic parameters up to the gel point at least. The apparent activation energy (E_a) for isothermal cure process was in agreement with that for nonisothermal cure process. E_a value in the early stage (78.5–81.0 KJ mol^?1) was about three times than that in the later stage (23.3–26.5 KJ mol^?1). The kinetic results from Avrami theory may present a combined effect of all factors, and which is helpful to understand the cure technique for XT–DDS system. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3483–3489, 2006     

水性双组分聚氨酯的分散混合和成膜

叙述了水性双组分聚氨酯体系的多元醇组分和多异氰酸酯 ,论述了水性双组分体系的分散混合和成膜。     

Charge/discharge characteristics of sulfur composite cathode materials in rechargeable lithium batteries

The charge and discharge characteristics of lithium batteries with sulfur composite cathodes have been investigated. The sulfur composites showed novel electrochemical characteristics. The analysis of the differential capacity indicated that the discharge process showed two voltage plateaus of 2.10 V and 1.88 V, and the charge process also presented two voltage plateaus of 2.22 V and 2.36 V. The overcharge test showed that the composite cannot be charged over 4.0 V, the voltage always stopped at about 3.9 V during charging, indicating that the composite presented the intrinsic safety for the overcharge of lithium batteries. The overcharge can cause serious safety problem for the conventional Li-ion batteries. The overcharge test also showed that the batteries with sulfur composite were destroyed when the upper cut-off voltage was over 3.6 V. However, the composite presented good reversible capacity after it was deep discharged even to 0 V. It showed stable cycleability and high cycling capacity of 1000 mAh g⁻¹ when cycling between 0.1 V and 3.0 V, indicative of the different characteristic from the conventional oxide cathode materials. The prototype polymer battery with the composite cathode material presented the energy density of 246 Wh kg⁻¹ and 401 Wh L⁻¹.     

基于灰色聚类分析法的武器装备试验保密管理工作评估

为保障国家安全与利益,避免发生武器装备试验泄密事件,须开展各项武器装备试验保密管理工作。通过构建试验保密管理工作评估指标体系,利用层次分析法（analytic hierarchy process,AHP）给出各指标的权重,基于灰色聚类分析法对武器装备试验单位的保密管理工作进行对比评估,为提高武器装备试验保密管理工作水平和效能提供参考。     

激光推进用于飞行器姿轨控制的分析与仿真

激光推进成本低、可靠性高,可用作飞行器的空间推进和姿态调整。建立了考虑反馈控制和激光推进的飞行器动力学模型,模型中的操纵控制项模拟了飞行器操纵系统和激光推进产生的力、力矩。详细研究了确定操纵项的方法,使用自适应飞行控制律,给出一种通过求解线性方程组确定操纵控制项的方法。以圆形盘旋轨迹为例,进行了数值模拟,计算结果显示,激光推进下的飞行器能很好按照目标轨迹飞行,并对计算结果进行了分析。     

探索新形势下军民融合式装备保障发展之路

从分析军民融合式装备保障的动因和存在的问题入手,阐述了构建完善军民融合式装备保障体系,必须要在思想观念、法规制度、体制机制、两用标准、军地人才、军用技术和民用技术等6个方面实现融合,为理解、贯彻装备保障走好军民融合式发展之路提供了一些思路和设想。     

基于软件工程的CAI课件设计方法探讨

对教学多媒体CAI课件的制作,结合软件工程理论和教学设计的相关原理进行了探讨。以《CAD/CAE集成技术及应用》课程为例介绍了课件的开发过程和开发思想,最后指出了多媒体课件开发技术的发展方向。     

社会性别视角下的我国女性参政

女性参政是女性的社会地位和在社会事务中所发挥作用的重要标志,也是社会进步程度的重要尺度之一。基于社会性别视角,分析了我国女性政治参与的现状和制约因素,解读了权力话语体系下的性别缺失,探讨了影响女性政治参与的深层原因。     

自驾车旅游视角下旅游产品的深度开发

自驾车游作为一种新兴的专项旅游在我国正迅速蔓延,但自驾车旅游产品的缓慢发展阻碍了自驾车游发展的良好势头.在了解自驾游特点的基础上,提出了自驾游旅游产品开发的原则、步骤及开发的项目.     

论江淹在赋体文学上的继承与创新

南北朝时代的辞赋大家江淹是处于元嘉文学向永明文学过渡时期的一位重要作家。他善于学习和借鉴前代赋家的创作经验。转益多师使他的辞赋创作在继承的基础上有了创新,成为六朝赋体文坛上一流的大家。