失重飞机搭载气／液两相流实验研究

利用俄罗期ＩＬ－７６ＭＤＫ失重飞机对失重条件下方形截面（１２ｍｍ×１２ｍｍ）管道内气／液两相流动进行了实验研究，观测到失重条件下气／液两相泡状流、弹状流和环状流等三种主要流型，同时得到了气、液两相介质的流量、温度和实验段内压力等结果，分析了失重条件下方形截面管道内气／液两相流型转换的条件。

微米／纳米尺度的材料力学性能测试

针对如何定量测定纳米、微米尺度及低维材料的力性能，叙述了采用当今先进观测手段，结合设备特点和力学分析技术来评价材料的硬度、弹性模量、屈服应力、抗蠕变及抗疲劳性等力学性能的测试方法。

Stiffness behaviour of injection moulded short glass fibre/impact modifier/polypropylene hybrid composites

The stiffness behaviour of injection moulded short glass fibre/impact modifier/polypropylene hybrid composites has been investigated in this work by theoretical predictions and experiments. Predictions from the self-consistent method were found to be in good agreement with test results for the impact modifier/polypropylene blends. By taking into account of the fibre orientation distributions in the skin and core layers, the values of Young's modulus for the skin and core layers were predicted by employing Eshelby's equivalent inclusion method and the average induced strain approach. The prediction of the values of Young's modulus for the whole sample was obtained by applying the simple mixture theory of laminated composites to the predicted results for the skin and core layers. Good correlation between predicted and experimental Young's modulus values were found.

Surface amorphous and crystalline microstructure by alloying zirconium using Nd : YAG pulsed laser

A novel composite coating was synthesized by laser alloying of zirconium nanoparticles on an austenite stainless steel surface using a pulsed Nd:YAG laser. The coating contained duplex microstructures comprising an amorphous phase and an austenitic matrix. A discontinuous zirconium-containing region formed at a depth of 16 mum below the surface. The amorphous phase was present in the zirconium-rich region, with the composition of zirconium ranging from 7.8 to 14.5 at. pet. The formation of the amorphous phase was attributed to the zirconium addition. The hardness, corrosion, and wear-corrosion resistance of the irradiated coating were evidently enhanced compared to those of the stainless steel.

光学蛋白质芯片技术及其应用

本文介绍一种新型光学蛋白质芯片技术和在生物医学领域的应用。通过固体基底表面的微格式化、表 面改性和生物配基固定等技术,制备多元生物活性感应表面;利用生物分子操作、蛋白质的特异结合性和高分辨率的 生物光学椭偏显微成像技术,达到识别、检测和纯化蛋白质的目的。它是一种非标记的多元蛋白质定量分析方法,并 且能够对蛋白质之间的相互作用过程进行实时测量,获得反应速率及反应条件等生物分子反应的动力学参数。

Electro-Osmotic Flow and Mixing in Heterogeneous Microchannels

Analytical and numerical studies of secondary electro-osmotic flow EOF and its mixing in microchannels with heterogeneous zeta potentials are carried out in the present work. The secondary EOFs are analyzed by solving the Stokes equation with heterogeneous slip velocity boundary conditions. The analytical results obtained are compared with the direct numerical simulation of the Navier-Stokes equations. The secondary EOFs could transport scalar in larger areas and increase the scalar gradients, which significantly improve the mixing rate of scalars. It is shown that the heterogeneous zeta potentials could generate complex flow patterns and be used to enhance scalar mixing.

罐体油泥自动清理系统研究

油田罐体内易沉积泥砂，这些合油泥砂的自动清理及无污排放难题长期无法解决。本文通过介绍一个工程应用，给出了一套解决此问题的工艺流程。

乳化油的性质及其制备方法研究

乳化油不仅广泛应用于内燃机和重油锅炉等设备，而且在材料制备工艺等其它领域亦在应用，本文介绍了乳化油微爆机理，物理性质，制备方法等问题。

基体激光淬火对镀铬层界面剪切强度的影响

针对激光淬火基体后再镀铬复合工艺提高镀铬身管寿命的实际工程问题,采用多裂纹拉伸技术证明该复合镀铬工艺可以提高界面剪切强度,并从材料学角度给予解释.离子冲击技术对界面强度的定性分析表明:激光淬火基体在消除铬层和基体之间过渡层的同时也提高了界面附近材料的强度.化学腐蚀去基体法研究表明,铬层界面材料强度的提高是晶粒细化的结果.因此得出激光淬火基体提高镀铬层界面剪切强度的原因是激光淬火消除了铬层和基体之间的过渡层和增强了界面附近材料的硬度和强度.

Size-dependent inelastic behavior of particle-reinforced metal-matrix composites

The strengthening behavior of particle-reinforced metal-matrix composites (MMCp) is primarily attributed to the dislocation strengthening effect and the load-transfer effect. To account for these two effects in a unified way, a new hybrid approach is developed in this paper by incorporating the geometrically necessary dislocation strengthening effect into the incremental micromechanical scheme. By making use of this hybrid approach, the particle-size-dependent inelastic deformation behavior of MMCp is given. Some comparisons with the available experimental results demonstrate that the present approach is satisfactory.

Effects of Microstructural Heterogeneity on the Spallation Behavior of Materials

It is of utmost importance to understand the spallation behaviour of heterogeneous materials. In this paper, a driven nonlinear threshold model with stress fluctuation is presented to study the effects of microstructural heterogeneity on continuum damage evolution. The spallation behavior of heterogeneity material is analyzed with this model. The heterogeniety of mesoscopic units is characterized in terms of Weibull modulus m of strength distibution and stress fluctuation parameter k. At high stress, the maximum damage increases with m; while at low stress, the maximum damage decreases. In addition, for low stress, severe stress fluctuation causes higher damage; while for high stress, causes lower damage.

Fracture mechanics of piezoelectric materials

This paper presents an analysis of crack problems in homogeneous piezoelectrics or on the interfaces between two dissimilar piezoelectric materials based on the continuity of normal electric displacement and electric potential across the crack faces. The explicit analytic solutions are obtained for a single crack in an infinite piezoelectric or on the interface of piezoelectric bimaterials. For homogeneous materials it is found that the normal electric displacement D-2, induced by the crack, is constant along the crack faces which depends only on the remote applied stress fields. Within the crack slit, the perturbed electric fields induced by the crack are also constant and not affected by the applied electric displacement fields. For bimaterials, generally speaking, an interface crack exhibits oscillatory behavior and the normal electric displacement D-2 is a complex function along the crack faces. However, for bimaterials, having certain symmetry, in which an interface crack displays no oscillatory behavior, it is observed that the normal electric displacement D-2 is also constant along the crack faces and the electric field E-2 has the singularity ahead of the crack tip and has a jump across the interface. Energy release rates are established for homogeneous materials and bimaterials having certain symmetry. Both the crack front parallel to the poling axis and perpendicular to the poling axis are discussed. It is revealed that the energy release rates are always positive for stable materials and the applied electric displacements have no contribution to the energy release rates.