图形液晶显示器在移频测试仪中的应用

介绍了点阵式图形液晶显示器在铁路移频测试仪中的应用,给出了铁路移频测试仪的整个硬件框图;阐述液晶显示控制器SEED1335的性能特点和指令系统;详细介绍了DSP2812与点阵式图形液晶显示器的硬件接口电路、时序匹配和初始化程序的编写。     

GaAs/AlGaAs多量子阱FET-SEED灵巧象元

将GaAs／AlGaAs多量子阱光探测器、光调制器与GaAs场效应晶体管（FET）混合集成,构成FET-SEED灵巧象元。光探测器和光调制器均为反射型自电光效应器件（SEED）,光源为骨子阱半导体激光器。测出的光输出Pout／光输入Pin特性表明,光输入信号对光输出信号有明显的调制作用,光输入信号较小的变化可以导致光输出信号较大的变化。     

二维光纤列阵接口器件及其在光互连网络模块中的应用

提出了一种适用于光电子集成ＣＭＯＳ－ＳＥＥＤ灵巧像素光互连网络的二维光纤束列阵结构和制作方法, 采用精密加工的光纤列阵定位槽和光学监控系统, 成功地研制出３２×２ 的单模和多模光纤列阵Ｉ／Ｏ接口器件, 光纤列阵层内及层间位移误差均小于２μｍ , 角向差小于０．０２°。实验中, 已将二维光纤列阵Ｉ／Ｏ接口器件用于１６×１６ ＣＭＯＳ－ＳＥＥＤ灵巧像素光电子集成Ｃｒｏｓｓｂａｒ光互连模块中, 实验结果表明, 该光纤束列阵Ｉ／Ｏ接口器件完全满足光互连系统的高精度要求。     

CMOS／SEED光电子集成Crossbar互连网络的实现及控制

本文报道了光电子集成 Crossbar互连网络的光学实现及电控制方法。采用带光窗口的 CMOS/SEED灵巧像元列阵作为逻辑控制交换开关节点 ,输出光强的高低态对比度约为 1.4。由波长为 85 0 nm的半导体激光器发出的光束经过位相计算全息光栅分束器分束 ,形成 8× 2的光束阵列 ,为 CMOS/SEED光调制器窗口列阵提供泵浦光源 ,采用精密加工的高精度二维光纤阵列作为信号输入、输出接口器件。采用计算机并口产生电控制信号实现网络的交叉连接功能 ,编制了相应的控制软件。实验上完成了 16× 16 Crossbar光互连网络的交换功能     

Effect of Si, Cu and Fe on mechanical properties of cast semi-solid 206 alloys

The development of a modified 206 alloy whose composition was optimized to minimize hot tearing during semi-solid forming was reported. The effect of varying silicon, copper and iron contents was investigated using a design of experiment (DOE) approach. Semi-solid slurries were prepared using the SEED process and injected into a high pressure die casting press. The hot tearing sensitivity results were reported for different alloy variants. The microstructure evolution during the semi-solid preparation was presented along with actual die cast components. The effects of silicon, copper and iron on mechanical properties in the T7 condition were also analyzed. Beyond the benefit of reducing hot tearing, it is shown that the tensile and fatigue properties remain compatible with the automotive industry requirements.     

Combined grain refining and modification of conventional and rheo-cast A356 Al–Si alloy

This paper describes a comprehensive study on the combined addition of Ti–B grain refiner and Sr modifier elements to A356 Al–Si alloy. Using different qualitative and quantitative techniques in conventional and semi-solid metal castings, it is shown that, while the refiner and modifier elements affect respectively the nucleation and eutectic reactions, the combined addition not only replicates both individual element effects but also gives the added bonus of better globularity in the semi-solid metal process. A new innovative concept is introduced for fluidity measurement by using the magnitude of remaining liquid in the form of drainage, which is increased by combined treatment.     

InGaAs／GaAs多量子阱SEED设计和特性研究

本文分析了计算了InGaAs/GaAs多量子阱（SEED）的激子吸收行为,对器件的多量子阱及谐振腔结构进行了设计和理论分析,用MOCVD系统生长了多量子阱外延材料,并且对器件的反射谱和光电流谱特性进行了测试。     

有线网等效加密算法及其实现

介绍了无线局域网的安全措施——有线网等效加密(WEP)算法,对其进行了安全性理论分析,详细描述了无线局域网媒体接入控制(MAC)器中WEP子模块的设计。用VerilogHDL完成了WEP模块的设计工作,并用Verilog-XL软件进行了验证通过。     

A feature extraction method for galvanized steel sheet powdering rates classification

Abstract

This paper describes a feature extraction method for classifying galvanized steel sheet powdering rates. By combining machine vision with statistics, and using the standard deviation's difference between powdered and normal regions, the range of powdered areas is recognized. The method exhibits a number of interesting features: it uses mathematical statistics for image feature analysis, and develops an effective method for analyzing particle size which cannot be measured by manual detection. The experiment result shows that the correction rate of this method to acquire galvanized steel sheet powdered regions is up to 99%, which satisfies the requirements of the application.