Corrosion inhibition of benzyl triethanol ammonium chloride and its ethoxylate on steel in sulphuric acid solution

The inhibitive effect of benzyl triethanol ammonium chloride (BTAC) and ethoxylated benzyl triethanol ammonium chloride (EBTAC) on the corrosion of carbon steel in sulphuric acid solution is measured by the weight loss method. The adsorption of these compounds (surfactants) leads to the formation of a monolayer on the metal surface. The relationships between the concentrations of these inhibitors and their surface properties, thermodynamic properties, surface coverage (θ) and inhibiting efficiency have been investigated. The results indicate that EBTAC is superior to BTAC.     

电冶钢结硬质合金热处理的研究

研制一种新型的钢结硬质合金--电冶熔铸钢结硬质合金,对其进行热处理试验.结果表明,该合金具有良好的热处理性能,而且热处理可以有效地改善合金原始态中不良的组织结构,经淬火与回火处理后,合金的力学性能有较大幅度的提高.     

The collapse of steel model columns with unequal flanges. II. Imperfect

The collapse behaviour of pin-ended steel columns with unequal flanges is investigated using a modified version of the Shanley model. Particular attention is given to the effect of the geometrical imperfection size on the behaviour of columns having a range of flange area ratios and slenderness values. Columns which are initially straight are dealt with in a companion paper (The collapse of steel model columns with unequal flanges. I. Perfect. International Journal of Mechanical Sciences, in press, doi:10.1016/j.ijmecsci.2004.09.005). Compressive yield of the smaller flange is confirmed as an important source of failure for the column. However, tensile yield of this flange can also cause failure, particularly at relatively high slenderness and/or imperfection size. Failure caused by yielding of the smaller flange, whether compressive or tensile, is often characterised by violent load-shedding, and high imperfection-sensitivity, and this is most noticeable at intermediate slenderness. A graphical method is suggested for predicting the maximum load, and for showing the degree of imperfection sensitivity.     

水工钢闸门的粘涂防腐

水环境的恶化、使水工钢闸门腐蚀加重，不饱和聚酯玻璃钢复合防腐工艺用于各种水环境中的水工钢闸门防腐，效果良好，结合农场工程施工经验，提出了水工钢闸门聚酯玻璃钢复合防腐层结构设计，施工工艺及质量标准，为该工艺的推广应用提供了一定的参考依据。     

等离子显示器动态图像处理技术

在说明彩色等离子体显示原理的基础上，阐述彩色PDP产生图像动态假轮廓现象的原因，并初步探讨了抑制这一现象的几种基本方法。     

中美两国输水钢管的差距及展望

通过调研美国输水钢管的发展历程,分析中美两国输水钢管的生产制作、检测等硬件以及设计技术和防腐等软性要素方面的现状可知,在以设备为主要支持的硬件方面,两国差距不是很大;主要差距是在输水钢管的设计理念、标准规范执行等以人的要素为主要支持的软性问题方面,包括壁厚设计、接口技术、防腐措施等多个重大方面都存在着较大差距。指出国内输水钢管线生产成本高,品质低。我国输水钢管生产企业应增强竞争能力,关注行业发展动向,吸收美国的发展成果经验,开创输水钢管发展新局面。     

Strength and ductility evaluation of steel bridge piers with linearly tapered plates

Important issues on the application of linearly tapered steel plates to highway bridge piers are discussed in this paper based on extensive experimental work. The factors that affect the seismic resisting performance of tapered plate steel columns were examined. The main factors considered are: (1) types of tapering mold line (outer, central, and inside tapering); (2) tapering ratio (or the slope of thickness change); (3) stiffeners’ rigidity; and (4) tapered stiffeners. To this end, four groups of specimens were tested under cyclic lateral loads and constant axial load. The columns with the outside taper plates were found to have the best strength and ductility characteristics among the three types of mold lines. In the case of different tapering ratios, the largest ductility was observed in the specimens with the tapering ratio slightly less than or equal to unity. The stiffeners’ rigidity ratio of around 3.0 was found to give the best ductility performance in columns with both constant thickness and varying thickness stiffeners. The test results were compared with a recently proposed design equation for limit strain of box columns with tapered plates. Finally, finite element analyses were performed and comparisons between the test and the analyses’ results of several test specimens are presented.     

宝钢三期工程新技术概述

宝钢三期工程项目初步设计工作已全面完成并通过审查，现已进入施工图设计与现场施工准备工作阶段。本文介绍了三期工程的建设规模与产品方案，简介了三期工程的建设水平与特点，三期工程主体项目中新技术应用状况与其建设进度，提供了宝钢三期工程项目的概貌。     

住宅室内的色彩环境设计

本文通过对室内空间背景色彩效果的论述，阐述了不同的色彩在不同的空间背景上的效果，同时定性地分析了在色采运用过程中须注意的各项事宜，并对住宅室内色彩环境设计做了理论上的探讨。     

新型高淬透性轴承钢GCr18Mo

研制的ＧＣｒ１８Ｍｏ新型轴承钢的淬透性为ＧＣｒ１５ＳｉＭｎ轴承钢的２．０￣２．５倍，新钢种轴承的使用寿命为ＧＣｒ１５ＳｉＭｎ钢的１．８￣５．４倍。