基于模块化结构的N位加法器的测试生成

针对单个ｓｔｕｃｋ－ａｔ故障，研究了Ｎ位加法器的测试矢量生成问题，对于行波进位加法器，只需８个测试矢量就可得到１００％的故障覆盖率；对于Ｎ位先行进位加法器，只需Ｎ＾２＋２Ｎ＋３个测试矢量即可得到１００％的故障覆盖率。     

Novel polycrystalline silicon thin film transistors prepared by deposition from Si2H6 and subsequent annealing by NH3 plasma

This work investigated the channel layer of polycrystalline silicon (poly-Si) thin film transistors (TFTs) prepared by amorphous silicon (a-Si) films deposited using Si₂H₆ gas. The recrystallization of channel layers, source/drain, gate electrodes and post implant anneal were performed at the same time. Due to the larger grain size, the device has higher field effect mobility than SiH₄ deposited devices. These devices were also subsequently passivated by NH₃ plasma. The NH₃ plasma significantly improves the n-channel devices; however, the improvement of p-channel devices is limited. Especially, the threshold voltage of n-channel devices is significantly shifted toward the negative gate voltage than the shift magnitude of p-channel devices. To investigate the band gap width and Fermi level by determining the leakage activation energy, it is found that the channel film is changed slightly from p-type to n-type. These results may be attributed to the donor effect by NH₃ plasma passivation.     

发动机润滑系统典型组成部件工作性能的试验研究

在各自专用试验台上，参照相应标准规范要求，分别对发动机润滑系统典型组成部件机油泵、机油滤清器和机油冷却器的工作性能进行了试验研究。试验重点考察了机油温度、机油泵转速以及出油压力等因素对机油泵供油特性的影响，分析了在各种温度下机油流经滤清器和冷却器时机油流量与其所产生的压降之间的关系。研究结果可以为发动机润滑系统设计和分析提供参考。     

一种国外火电厂烟气脱硫系统成本估算模型介绍

近些年来,随着能源与电力行业的快速发展,导致了大量SO2污染物的排放,因此必须推广烟气脱硫技术以减小SO2的排放。介绍国外的一种根据初投资和运行维护费用对新建电厂和原有电厂增加脱硫系统的成本估算模型。此模型可以初步评价机组FGD(FlueGasDesulfurization)建设的经济性,估算初投资、运行和维护成本,从而为电厂脱硫的预可行性研究提供参考。     

Sol-gel processed silica/titania/ÿ-Glycidoxypropyltrimethoxysilane composite materials for photonic applications

Silica/titania/?-Glycidoxypropyltrimethoxysilane composite materials processed by the sol-gel technique were studied for photonic applications. Waveguide thin films with thickness more than 1.7 μm were prepared by the sol-gel spin coating technique and low temperature heat treatment from this high titanium content composite materials. The films were analyzed by atomic force microscopy (AFM), ellipsometry, differential thermal analysis (DTA), thermal gravimetric analysis (TGA), UV-visible spectroscopy (UV-VIS), and Fourier transform infrared (FT-IR) spectroscopy. It was observed that the film becomes thinner as the titanium contents increase. A change of the refractive index through the range 1.52–1.61 at the optical wavelength of 633 nm was achieved by varying the molar ratio between silica and titanium. A dense, low absorption, and high transparency in the visible range waveguide films could be obtained at a low temperature. It was also noted that organic compounds in the film would decompose in the temperature range from 200°C to 480°C. Accordingly, purely inorganic silica-titania films with a thickness of about 0.7 μm could also be obtained by a single-coating process, when the film was baked at a temperature of 500°C or higher. The waveguides properties and photonic applications of the composite material solgel films were also investigated.     

Impedance characteristics of planar bow-tie-like monopole antennas

The impedance characteristics of planar bow-tie-like monopole antennas have been studied experimentally. The planar bow-tie-like monopole antenna achieves a broad bandwidth, typically of >75%. A modified formula is suggested to accurately evaluate the frequency corresponding to the lower edge of the impedance bandwidth     

基于分类树的雷达软件测试用例设计

现代雷达软件测试由于软件规模越来越大,利用常规的组合覆盖方法测试各功能单元工程上越来越不现实。文章针对分类树方法设计测试用例产生大量冗余测试用例的缺陷,提出了在分类树方法生成的用例集基础上,利用正交试验设计法对其进行精简优化,以提高测试效率。实验结果表明,基于正交试验设计法的测试用例优化,可以有效减少冗余测试用例,节省测试资源和成本,具有一定的工程应用价值。     

基于J2EE的综合营业系统的设计

文中主要介绍了综合营业系统的设计过程，系统设计采用了J2EE技术，运用MVC的设计思想，通过Struts实现系统架构，简化了软件的开发，提高了软件的灵活性、可扩展性和重用性。     

WCDMA与GPRS技术浅析

主要介绍了WCDMA技术与GPRS技术的基本概念,并对二者进行了比较,指出在向第三代移动通信系统(3rdGeneration,简称为3G)过渡的时代,这两种技术各有所长,必将有一番大的较量。     

基于环境变迁的构件组合模型

Internet为分布构件的重用提供了平台，准确、高效的构件组合是新型软件生产的重要环节．针对新一代的软件模型．网构软件，本文首先建立了构件的环境本体，并提出将变迁图作为刻画环境本体的模型；其次提出了基于环境及其状态变迁的构件描述框架；然后针对网构软件的特征，提出了基于环境变迁的构件组合算法，最后用具体的案例展示了算法的可行性．