UHMWPE/CNTs导电复合体系的电性能

制备了低逾渗值的超高分子量聚乙烯(UHMWPE)/多壁碳纳米管(CNTs)导电复合材料,CNTs分布于UHMWPE粒子的表面和界面处。研究了UHMWPE/CNTs复合材料的温度电阻行为,发现在基体熔点附近,电阻急剧增加,并达到一最大值,然后电阻开始下降,体现负温度电阻效应(NTC)。分析了复合材料电阻松弛时间的升温速率的依赖性,结果表明,升温速率越快,电阻的松弛时间越短。     

EXPERIMENTAL STUDY ON ABSORPTION OF OIL BY SEDIMENT IN WATER

The absorption behaviour of emulsified oil by sediment (include loess) is studied by experiment. The absorption equation and the relations of absorption capacity with sediment concentration, grain size, salt concentration and temperature are analyzed. The absorbing reaction kinetics process is also studied. The absorption of emulsified oil by sediment in rivers is agreed with the Langmuir-Freundlich absorption equation. Experimental data shows that the larger the equilibrium oil concentration and the salt concentration , the more the absorption capacity. The absorption capacity increases immensely with grain size and temperature reduction.     

聚合物熔体振动挤出成型技术的研究进展

介绍了各种聚合物熔体振动挤出成型技术,包括机械振动、电磁振动和超声振动,对实现振动的装置或口模进行了简要介绍,利用这些振动设备对聚合物熔体振动挤出技术进行研究,发现振动挤出可使聚合物熔体加工流变性能和力学性能都得到一定程度的改善,凝聚态结构也发生了一些变化。     

含锆高铝耐火纤维毡的导热性能研究

测定了含锆高铝耐火纤维毡在不同条件下的高温热导率 ,并分析了温度 容重 方向对热导率的影响。结果表明 :容重一定时 ,热导率随温度升高而升高 ;高温热导率随容重升高而减小 ;材料热导率的各向异性比较显著     

Observer Based Projective Synchronization Method for a Class of Chaotic System—Part I: Linear Synchronization Subsystem

In this three-part paper, an observer based projective synchronization method for a class of chaotic system is proposed. At the transmitter, a general observer is used to create the scalar signal for synchronizing. In this part, the structure of the projective synchronization method is presented. And the condition of projection synchronization is theoretically analyzed when the synchronization subsystem is linear.     

基于远程用电实时监测的电力用户需求侧管理支持系统

介绍基于远程用电监测的电力用户需求侧管理支持系统设计。该系统以远程配变实时监测控制系列、实时抄收系列、故障诊断系列、无线数据通信系列现场终端以及集成上述所有功能的一体化终端为基础构建数据采集与负荷控制硬件平台，基于无线虚拟专用企业网技术构建通信平台，基于数据规划、数据库健壮设计及数据库中间件访问技术构建用电实时数据平台，可实现用电数据分析与负荷预测，与调度自动化系统整合，可实时优化供用电负荷控制。应用实践表明，系统非常成功。     

水力空化对大豆分离蛋白谷氨酰胺转氨酶促凝胶行为的影响

利用基于涡流的水力空化处理大豆分离蛋白,通过比较处理前后大豆分离蛋白在谷氨酰胺转氨酶的催化作用下形成凝胶的质构特性、持水性、流变学性质、分子间作用力、微观结构和二级结构的变化,来研究大豆分离蛋白经水力空化处理后其酶促凝胶行为的变化规律及机制。结果表明,与未经水力空化处理的大豆分离蛋白相比,大豆分离蛋白经水力空化处理30 min后形成的酶促凝胶强度（P＜0.05）、持水性（P＜0.05）和储能模量增加;凝胶形成的分子间作用力发生变化,离子键、氢键及疏水相互作用相对含量显著降低（P＜0.05）,而二硫键和非二硫共价键相对含量显著增加（P＜0.05）;扫描电子显微镜观察到经水力空化处理后的大豆分离蛋白形成的酶促凝胶孔洞较小,微观结构更加致密和均匀;红外光谱分析结果表明凝胶的二级结构也发生了改变,β-折叠、β-转角相对含量显著增加（P＜0.05）,而α-螺旋、无规卷曲相对含量显著降低（P＜0.05）。可见,水力空化处理在一定条件下可以改善大豆分离蛋白谷氨酰胺转氨酶促凝胶的性能,可作为一种有效的方法应用于食品工业。     

最小生成树的算法

本文提出了一个利用集合运算生成最小生成树的算法。研究了实现集合运算的数据结构及施加在这个结构上的算法。该算法利用公式分组排序。利用路径压缩的方法进行查找，并运算。该算法将有Ｎ个顶点Ｅ条边的无向连通网络生成最小生成树的期望时间是Ｏ。     

ANALYSIS AND ESTIMATION OF HYDRAULIC STABILITY OF FRANCIS HYDRO TURBINE

With the development of large-capacity hydro turbines, the hydraulic instability of hydro turbines has become one of the most important problems that affect the stable operation of the hydro-electric units. The hydraulic vibration and unstable operation of Francis hydro turbines are primarily caused by the unsteady pressure pulsations inside draft tubes. The forced rotating vortex core at the runner exit and the channel vortices inside Francis turbine runners are origins of the unsteady pressure pulsations when operating at partial load. This paper briefly analyzes the hydraulic instability of operation caused by the vortex core and channel vortices at partial load, then, presents a way to estimate the hydraulic stability by calculation of the flow behavior at the runner exit. The validity of estimation is examined by comparison with experimental data. This will be helpful to evaluate the alternative design and predict the hydraulic stability for both the prototype and model hydro turbines.     

Response of Sample Temperature during Straight-Line Ion Implantation

A theoretical model for calculation of the sample temperature during straight-line nitrogen ion implantation was established based on the results of experiment in this paper. Taking the pure aluminum as the samples, and from the transformation of electric energy into thermal energy, the calculated values of the temperature were in good agreement with the measured values in the experiment. According to the simulation, this technology can be applied to the control of specimens temperature during the implantation.