丙烯酸树脂/钛酸钡纳米复合材料的研究

采用原位聚合的方法制备了丙烯酸树脂/BaTiO_3纳米复合材料,用SEM分析其表面形貌。研究了该复合材料与聚对苯二甲酸乙二醇酯(PET)基膜复合的电性能,并探讨了PET基膜和涂层对复合薄膜整体电性能的影响。初步制备出了具备高介电常数、高击穿、低损耗的复合薄膜。为工业化低成本生产高储能密度电容器提供了新的思路。     

数字电路中的电磁兼容设计

该文对数字电路中由信号和时钟电路产生电磁干扰的机理进行了详细的分析和讨论,提出了对信号辐射干扰和时钟电路干扰的有效解决方法,并为电路的设计提供了抑制干扰的一些准则.     

几种实用的抑制电磁干扰的方法

电磁干扰问题不仅影响到电子仪器工作的质量,有时更是破坏整个系统正常运行的祸害。本文介绍了出现电磁干扰的三个必要环节。针对经常出现的电磁干扰问题的各种情况,提出了相应的用于抑制电磁干扰的方法,并对这些方法的原理及应用环境进行了分析。     

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。     

聚酰胺对聚甲醛的稳定化作用

采用220℃等温热失重、等速升温热重分析(TGA)分别研究了以聚酰胺为稳定剂的聚甲醛体系POM／COPA、POM／SAN／PA在氮气和空气气氛中的热稳定性,同时用Coats-Redkrnd法计算了各体系在空气中的降解动力学参数。结果表明,加入稳定剂COPA、PA的聚甲醛体系在220℃等温热降解1h的失重率远小于空白POM;TG分析数据也显示改性后的聚甲醛体系在氮气中的Tonset明显高于空白POM.空气中空白POM的活化能及分解温度均低于改性聚甲醛。     

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.     

Vacuum System for HL-2A Tokamak

The vacuum system for HL-2A was built in 2003. The test results indicated that this system is feasible. It consists of three main parts: a pumping system, a pumping divertor and a glow discharge cleaning (GDC) system. For the pumping system, there are three main functions: (1) evacuating the vacuum vessel thus to produce an ultra high vacuum, (2) removal of impurities released during baking and (3) pumping during GDC. The pumping divertor controls the particles at the plasma edge and the GDC system provides a clean wall conditioning. During the first campaign of physical trial experiment on HL-2A, the ultimate pressure reached 4.6 × 10-6 Pa, and the total leakage and outgassing rate in 12 hours was 1.8 × 10-5 Pa·m3/s, which is close to that of ASDEX.     

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.     

虚拟制造环境中制造资源的分配和共享研究

基于制造资源社会化的思想，将制造资源从本地扩展到区域和整个社会领域，提炼相关的信息，将资源定义广义化、分配柔性化，并在分析虚拟制造资源体系结构的基础上，提出了资源信息的约束描述和基于XML抽象表达机制，探讨了资源内部的约束机理和二次规划，并对资源的分配和共享模式进行研究，建立了在．net构架上基于ASP结构、XML数据交换的网络实现模式。     

工程车辆换挡瞬态的动力学仿真模型

用动力学分析模型和计算机仿真技术来模拟工程车辆中由离合器操纵的齿轮换挡所激励的动力传动瞬态响应，提出了分析具有多个离合器和互连行星排的变速箱动力学特性的方法。所建立的仿真模型可用于优化系统设计参数、评价传动系统的零件寿命和车辆换挡的平顺性。