Structure and composition of artificially synthesized rusts of Zn-Fe and Zn-Ti alloys

The artificial rusts of Zn-Fe and Zn-Ti alloys were synthesized from aqueous solutions of mixed metal chloride, sulphate, and nitrate such as ZnCl₂-FeCl₂, ZnSO₄-Ti(SO₄)₂, Zn(NO₃)₂-Fe(NO₃)₃, and so forth, and were characterized by a variety of techniques. Rust particles with different compositions and morphology were formed, strongly depending on the types of anions and metal ions. Sheet particles of basic zinc chloride (simonkolleite) were generated in the ZnCl₂-FeCl₂ system and the plate particles of basic zinc sulphate were formed in sulphate systems. These sheet or plate particles and the nanoparticles produced in Zn-Ti systems are expected to form compact rust layers by preferred orientation and dense packing, respectively, and contribute to a high corrosion resistance of Zn alloys.     

反求工程测量方法综述

详细介绍了目前国内外在反求工程中所采用的各种测量方法，并对它们的特点及适用场合进行了详细的比较。     

Short‐Time Tuning of the Biological Activity of Functionalized Polyelectrolyte Multilayers

This article demonstrates the tuning of the biological activity of a surface functionalized by a polyelectrolyte multilayer. The interaction of protein A with macrophages is used as the model system. The film consists of two polypeptides, poly(lysine) and poly(glutamic acid); each “build‐up” solution is a mixture of the respective D ‐ and L ‐enantiomers (d and l enantiomers). Cells are deposited on top of the film, and they produce tumor necrosis factor alpha (TNF‐α) as they come into contact with the protein. Depending upon the d/l‐enantiomer ratio of the polyelectrolyte solutions used for the film build‐up, and the embedding depth of the protein, the production of TNF‐α commences after a varying induction time and displays a transition from no‐production to full‐production, which takes place over a period of time that depends on the film's composition and embedding depth. Thus, it is shown that by changing these two parameters the timing of the protein's activity can be accurately tuned.     

以太网知识讲座⑴—以太网的基本概念

系统地介绍了以太网的基本概念、介质接入控制和物理层标准规范、以太网信号的帧结构、网络硬件设备、网络组成及主要的性能，以及以太网信号在PDH、SDH/SONET中的传输等等。     

MIS电容器的平带电容的计算

研究半导体表面态常用Ｃ－Ｖ法，关键是要确定ＭＩＳ电容器的平带电容的值。     

Structure of titanium-doped goethite rust

To investigate the influence of titanium addition on the formation and structure of goethite (α-FeOOH) rust which is one of main corrosion products of weathering steel, the artificially synthesized α-FeOOH rusts were prepared by hydrolysis of aqueous solutions of Fe(III) containing Ti(IV) at different atomic ratios (Ti/Fe) in the range 0-0.1. The obtained rusts particles were observed by TEM. Characterization by XRD, N₂ absorption, Mössbauer spectroscopy was also done. TEM observation revealed that the α-FeOOH rust particle size increased with the increase of Ti/Fe, and that Ti-enriched poorly crystalline particles were formed around the rust particles. XRD confirmed that the crystallite size increased with the increase of Ti/Fe, while the XRD peaks decreased in intensity. Specific surface area obtained by N₂ absorption increased with the increase of Ti/Fe. It is deduced from the obtained results that the addition of Ti(IV) increases the crystallite size of α-FeOOH, and produces double domain particles consisting of the particle core and a porous poorly crystalline shell. It is thought that such unique rust structure produced by titanium addition contributes to the protective properties of rust layer of the weathering steel.     

量子阱激光器超晶格缓冲层的研究

在量子阱半导体激光器结构中采用优化超晶格缓冲层来掩埋衬底缺陷，获得了性能优良的激光器。对超晶格缓冲层所具有的“量子阱陷阱效应”进行了理论分析。     

Technology of Laser Protection and Defrosting Film^①

A compound coating of electrically conductive and visible transparent film and laser protective film has been developed,this coating has light densities of no less than 4 against 0.53μm and no less than 3 against 1.06μm in the range of ±30°angular field.The average transmittance value as high as 60% from 0.4μm to 0.7μm has been achieved.The structures of the laser protective filters are compared.The refractive index of a compound material used in the matching layer has been given.Measured results of the laser protective film coating are compared with that of the compound coating.     

吸收系数在WJ构造储层横向预测中的应用

在进行储层描述或油气预测时，吸收系数是一个很重要的以参数，它反映岩性的变化具有较高的灵敏度。利用吸收系数并配合速度，振幅和频率等其它地震或非地震信息，进行油藏描述和油气预测有其独特作用和效果，可大大提高储层横向预测解释的精度。     

温度传感功能薄膜技术

随着科学技术的不断进步,人们对温度信息获取的手段提出了新的要求,对温度传感器超小型化的要求越来越迫切,薄膜传感器的出现满足这一要求。薄膜温度传感器由于其优异的性能,在工业生产中越来越得到广泛应用。本文介绍了薄膜温度传感器的特点、种类、应用、测温机理、膜系及其主要制备工艺等,并探讨了薄膜热敏电阻、薄膜热电偶的标定方法,最后论述了温度传感功能薄膜的国内外发展现状及其目前需要解决的关键技术。