电路原理图纸识别系统研究与实现

本文讨论了纸质电路原理图的自动输入和识别,主要理解图纸字符、分立元件和相互间的拓扑关系。首先对扫描得到的光栅图像进行了字符的模式分离,采用8x8网格抽取63种字符的特征,并采用BP神经网络进行识别。提出探索试探法快速跟踪直线/曲线;用特征匹配方法混合识别导线和部分元器件;提出了X/Y坐标正交投影的方法识别元器件,提高了识别速度;而右手边缘跟踪的识别方法抗噪声的性能较强。最终将字符、导线和元器件符号三元素有机结合,得到规范化的图纸输出。     

基于单片机控制的同步呼吸机设计

介绍了一种同步呼吸机的设计。该呼吸机采用C8051F020单片机为控制核心,具备多种呼吸模式。文中介绍了呼吸机的系统组成和电路组成,并对单片机系统硬件结构及软件设计作了具体说明。     

除尘系统双流量喷嘴的性能试验研究

通过试验研究了除尘系统双流量喷嘴，在喷嘴不同结构参数下气压和水流量变化的特性，分析了喷嘴结构参数、气压、水流量对水压、气耗率、雾化角、颗粒度以及水滴喷出速度的影响规律，优化后的喷嘴有效地改善了烟气冷却不充分的状况。为喷嘴雾化冷却性能的分析研究和优化设计提供了技术途径。     

金属板材无模成形加工轨迹生成的研究

介绍了一种采用快速原型制造原理的金属板材无模成形技术．根据快速成形技术中分层制造的思想，从板材无模成形的技术特点出发，采用基于STL文件的金属板材无模成形的加工轨迹生成方法，通过构造STL文件的等距模型并对其进行切片，得到加工轨迹。     

基于面向对象和STEP技术的注塑模产品模型研究

本文分析了数据交换技术的发展，指出STEP技术可以满足集成化系统开发的需要，而面向对象技术则很好地解决了模型间的数据交换，并据此提出了一基于面向对象和STEP的注塑模产品模型，该模型分为总体信息模型、主特征模型、结构信息模型及辅助装置模型，并用EXPRESS-G对其作了进一步阐述。     

基于CPLD的高速数据采集系统研究开发

本文针对高速数据采集时,无法由单片机控制整个采集过程的问题,阐述了通过对CPLD编程实现采集数据DMA直接传输,从而实现高速数据采集.重点分析了控制器的设计原理,设计过程所应注意的问题,以及VHDL程序编写.     

新型倾角传感器在伺服系统中的应用

本文介绍了一种新型的两轴倾角传感器在伺服系统中的应用,详述了其工作原理和工作方式,通过一个应用实例,简介使用该传感器后的伺服系统的组成,给出系统的应用电路图,包括一种数字输出和摸拟输出的接口电路及程序框图,对于在伺服系统中需要惯性空间位置信息的情况,本文提供了一个较为实用的设计方案.     

Study on Improving Solidification Structure of Rare Earth Al-Si Alloys with Electropulse Acting on Liquid Alloy

Electropulse modification (EPM) process, a new physical field method for improving the solidification structure of metals was introduced.Different from other research, EPM is only acting pulse current on melt under liquid state.The solidification structure of Al-Si alloys, A1-Cu alloys,cast iron and steel can be modified obviously with this method: the solidification structure of ZL101 alloy presented the Na and Sr modification and the mechanical properties were enhanced; a large number of primary silicon appeared in the microstructure of ZL109 alloy; the equiaxed grain zone was expanded and the grains were fined in Al-5.0wt% Cu alloy; the graphitization took place in solidification process of molten cast iron; the grain sizes of solidification structure of T8 steel were reduced significantly and the shape of steel pearlites also changed; the equiaxed grain zone increased to 88% from original untreated 19%, the equiaxed grains were fined and the intercrystalline crack was avoided in concasting billet by continuously treating liquid electrical sheet steel in tundish.Effects of rare earths on casting Al-Si alloys were also summarized.The method of modifying the solidification structure of rare earth Al-Si alloys with EPM in producing the alloys was proposed.     

Seismic Retrofit of Hollow Rectangular Bridge Columns

The seismic performance of rectangular hollow bridge columns is a significant issue of the high-speed rail project in Taiwan. The flexural ductility and shear capacity of such columns with the configuration of lateral reinforcement used in Taiwan have been studied recently. This paper reports that hollow rectangular bridge columns retrofitted with fiber-reinforced polymer (FRP) sheets were tested under a constant axial load and a cyclically reversed horizontal load to investigate their seismic behavior, including flexural ductility, dissipated energy, and shear capacity. An analytical model was also developed to predict the moment-curvature curve of sections and the load-displacement relationship of columns. Based on the test results, the seismic behavior of such columns will be presented. The test results were also compared to the proposed analytical model. It was found that the ductility factors of the tested piers are in the range from 3.4 to 6.3, and the proposed analytical model can predict the load-displacement relationship of such columns with acceptable accuracy. All in all, FRP sheets can effectively improve both the ductility factor and shear capacity of hollow rectangular bridge columns.     

Formation cross sections of nuclei with (n,2n) reactions

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