煤气压力作用下干式贮气柜壁板的近似解析解

将曼型干式贮气柜的壁板处理为与之等效的构造正交各向异性板，并从边界条件、静力平衡条件和变形协调条件获得了壁板在煤气压力作用下的弯曲变形和中面变形的近似解析解     

具有边梁加固的板的弯曲

建立了具有边梁加固的板弯曲的数学模型，并给出平衡微分方程和边界约束条件的完整形式，同时分析了解的存在性、唯一性。     

Threshold creep behaviour of discontinuous aluminium and aluminium alloy matrix composites: An overview

Several sets of creep data for aluminium and aluminium alloy matrix composites reinforced by silicon carbide particulates, silicon carbide whiskers or alumina short fibres are analysed. It is shown that for this class of discontinuous composites the threshold creep behaviour is inherent. Applying the concept of threshold stress, the true stress exponent of minimum creep strain rate of approximately 5 follows from the analysis even when the matrix solid solution alloy exhibits Alloy Class creep behaviour, for which the value of 3 for the true stress exponent is typical. The creep strain rate in the discontinuous aluminium and aluminium alloy matrix composites is shown to be matrix lattice diffusion controlled. The usually observed high values of the apparent stress exponent of creep strain rate and the high values of the apparent activation energy of creep are then rationalized in terms of the threshold creep behaviour. However, the origin of the threshold stress decreasing with increasing temperature but not proportional to the shear modulus in creep of discontinuous aluminium and aluminium alloy matrix composites is still awaiting identification. The creep-strengthening effect of silicon carbide particulates, silicon carbide whiskers and alumina short fibres is shown to be significant, although the particulates, whiskers and short fibres do not represent effective obstacles to dislocation motion.     

Effect of process parameter changes on the composition of magnetron sputtered and evaporated TiN and AlN films measured by UHV in-situ techniques

TiN and AlN films are deposited on HSS steel substrates in an ultrahigh vacuum magnetron system equipped with in-situ Auger electron spectroscopy (AES) and mass spectrometric sensors for plasma diagnostics. The composition of TiN_x coatings is measured by AES as a function of the N₂ pressure, the bias voltage, and the d.c. power. The flux of ionic particles impinging on the substrate surface and their energies are determined by a quadruple mass analyzer mounted behind a hole in the substrate. In addition, the reactivity of neutral nitrogen molecules in a reactive evaporation process is measured by a quartz crystal microbalance.     

干涉着色阳极氧化铝

本文主要介绍了利用光干涉效应原理的工艺着色阳极氧化铝,并对干涉色涂层的微观结构进行了初步分析。将经过常规硫酸阳极氧化后的铝试样,在磷酸溶液中作短时间的阳极氧化扩孔处理,再置于普通电解着色液中进行电解着色,即可获得性能优异的干涉色涂层。阳极氧化铝中的干涉着色效应,来源于沉积金属层表面和阳极膜/铝基体界面的两束散射光的相互作用。     

Symmetric Galerkin BEM for shear deformable plates

A symmetric Galerkin boundary element formulation is developed for shear deformable plates. A mixed strategy is used for the integration process, i.e. partial regularization using simple solutions followed by a singularity subtraction technique. For the shear equation, full regularization is achieved using new kernel relationships found through a constant shear mode of deformation. Some of the strong singular integrals are avoided altogether by using a modified traction obtained through a very simple variable change; appropriate boundary conditions are defined. Details of the implementation are given and several example problems solved to verify the accuracy of the proposed formulation. Copyright © 2003 John Wiley & Sons, Ltd.     

Zn/55Al coating microstructure and corrosion mechanism

In the present work Zn/55Al coatings from different suppliers were studied. The results revealed the presence of at least two different phases in the interdendritic and in the dendritic areas that compose the coating. Analyses done in the cross section of test panels exposed for five years in six different atmospheres showed that the corrosion process begins in the aluminium-rich phase present in the interdendritic area.     

The Application of Physicochemical Treatment to an Overloaded Sewage Works

The application of physicochemical treatment (PCT) to an overloaded sewage-treatment works is described. Two methods were evaluated: (i) the 'Clariflow'system marketed by Energy and Waste Systems Ltd, and (ii) an 'in-house'system of dosing chemicals into existing tanks. Both methods increased the efficiency of primary sedimentation, thereby reducing the organic load applied to biological filters and improving final effluent quality. Some indication of the cost-benefit relationships was obtained.     

我国独具特色的稀土电工铝和铝稀土合金

中国稀土铝导体和铝稀土合金研究，开发和应用过程概况，稀土导电铝和稀土铝合金的特性；铝稀土合金应用领域逐步扩大，稀土消费量迅速增加；制取铝稀土合金系列的新思想和新工艺过程；稀土添加剂在铝和铝合金中的作用；某些值得注意的问题。     

柔印技术发展前景

通过对柔印技术的发展历程回顾,与其他三大印刷术(胶印、凹印和丝印)比较、剖析,阐述了 国内外柔印的各种优点及其潜在实惠,认为柔印技术在将来一定时期内会逐渐占领印刷业市场更大份额,虽不 可能一统市场,但柔印业具有广阔的发展前景。