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。     

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.     

课件中的多媒体人机界面和互动设计

多媒体课件是信息技术与教学的有效结合。以《快速理解ERP思想》课件的制作为例,从教学目标、学生特征、教与学策略等方面,分析了学习情景的创设,介绍了多重交互设计模式及信息资源的提供。     

煤矿井下矿压监测系统

本文针对我国矿井顶板事故多发的情况,设计一套矿压综合检测系统,能快速准确反馈各种矿压信息,以采取措施加强顶板管理,保证煤矿的安全生产和运输。     

CAD与Oracle数据库的集成

介绍了一种实现Ｉ－ＤＥＡＳ中Ｄｒａｆｔｉｎｇ 与Ｏｒａｃｌｅ 数据库集成的方法， 解决了Ｄｒａｆｔｉｎｇ 中明细表输入困难的问题， 同时实现了ＳＧＩ工作站上汉字的输入输出．     

W-Ni-Fe重合金相界偏析的研究

使用俄歇能谱仪对合金断口表面进行了细致分析，研究了W-Ni-Fe重合金的相界偏析。指出杂质元素在相界的偏析将导致粘结相与钨晶粒的结合强度降低，从而恶化合金的力学性能。     

干燥窑温度模糊控制系统的研制

以沈阳市北方机械厂开发的新型木材干燥设备为例，对干燥窑温度的模糊控制方法进行了研究，并提出了智能化模糊控制方案。该系统解决了木材干燥过程中监测管理、热力自动调整等问题。     

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。     

光盘刻录机性能研究

研究了光盘刻录机的性能,从光盘刻录机的使用入手,给出高性能刻录机应具备的性能参数.