DK——2A型单体液压支柱低压密封质量检测仪

单体液压支柱低压密封质量,直接影响到工作面安全生产。为使密封质量检测过程自动化、定量化,研制了DK—2A型单体液压支柱低压密封质量检测仪。该检测仪采用单片机控制,以PC—1500计算机进行数据处理,一次可检测15根支柱,提高检测效率四至八倍。本文论述检测仪的工作原理、硬件及软件设计,并给出程序流程图。此外,对单片机测周期误差进行了分析。     

通过界面的调制电流对LiNbO3晶体分凝的影响

应用生长界面标记技术,标记不同调制电流密度通过固—液界面生长的区域,用离子探针测量各区域中溶质Y的相对浓度,得到在±7mAcm~(-2)的调制电流密度范围內,Y的相对浓度与调制电流密度成正比。并研究了二个不同周期的交变的调制电流或一个给定周期的调制电流和一个溫度波动同时引入生界面对溶质Y分凝影响,观察到二种不同周期的波动在生长界面耦合形成的复杂调制结构的生长层。     

Adhesion of PBO Fiber in Epoxy Composites

The high mechanical and thermal performance of poly p-phenylene- 2, 6-benzobisoxazole ( PBO ) fiber provides great potential applications as reinforcement fibers for composites. A composite of PBO fiber and epoxy resin has excellent electrical insulation properties, therefore, it is considered to be the best choice for the reinforcement in high magnetic field coils for pulsed magnetic fields up to 100 T.However, poor adhesion between PBO fiber and matrix is found because of the chemically inactive and/or relatively smooth surface of the reinforcement fiber preventing efficient chemical bonding in the interface, which is a challenging issue to improve mechanical properties. Here, we report the surface modification of PBO fibers by ultraviolet (UV)irradiation, O2 and NH3 plasma, as well as acidic treatments. The interfacial adhesion strength values of all the treatments show the similar level as determined for aramid fibers by pull-out tests, a significant impact on fibermatrix-adhesion was not achieved. The surface free energy and roughness are increased for both sized and extracted fibers after plasma treatments together with maleic anhydride grafting. The sized fiber shows marginal improvement in adhesion strength and no change in fiber tensile strength because of the barrier effect of the finish.For the extracted fiber, different surface treatments either show no apparent effect or cause reduction in adhesion strength. Atomic force microscopy (AFM) topography analysis of the fracture surfaces proved adhesive failure at the fiber surface. The fiber surface roughness is increased and more surface flaws are induced, which could result in coarse interface structures when the treated fiber surface has no adequate wetting and functional groups. The adhesion failure is further confirmed by similar adhesion strength and compression shear strength values when the fiber was embedded in various epoxy resins with different temperature behavior. The tensile strength of fiber is sensitive to surface treatment conditions as revealed by a bimodal Weibull statistical distribution analysis. Considerable strength reduction occurred, particularly for cases of acidic and plasma treatments, while UV irradiation shows the better ability to retain fiber strength.     

微型计算机控制的缆道测验装置的研制

本文介绍了一个微型计算机控制的水文缆道测验系统,详细论述了该系统的设计思想、原理、方框图、接口电路以及程序设计和提高可靠性的方法。     

交际英语教学法的优势和具体应用

本文通过对现实英语教学现状和环境的分析 ,论述了交际英语教学的长处及贯彻这一教学思想的方法和原则 ,希望对交际英语中忽视的重要环节 ,如互动、界面等引起重视 ,降低和减少与交际英语教学冲突的观念和实际 ,从而使学生的英语语言素质得到较大的提高和改善     

Development of a Support Tool for Rapid Application Integration of CIMS

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通过GPIB接口实现数字存储示波器与微机之间通讯

利用ＧＰＩＢ接口总线实现微机与数字存储示波器ＰＭ３３５０数据传输。讨论了联机过程中有关问题，给出了控制程序的流程图。     

微机二级控制印染联合机同步传动系统研究

主要论述了微机两级控制系统在各种联合机同步传动中的应用.上位机为PC总线586工业控制计算机,下位机由单片机、西门子变频器等组成.     

金融信息网络系统的模型化方法

提出了金融信息网络系统的模型化方法。它包括功能模型、信息模型、界面模型和组态模型，并考虑了系统的集成方法，同时运用这套方法开发了ＮＫ－ＺＪＦＸ证券交易仿真系统，取得了很好的效果。     

设计多媒体风格的屏幕保护程序

本文讨论了在VB环境下设计多媒体风格的屏幕保护程序的基本步骤、设计过程中涉及到的关键问题及其实现方法