Microstructure and Mechanical Properties of Heat-treated GeSb_2Te_4 Thin Films

The effect of annealing on microstructure,adhesive and frictional properties of GeSb 2 Te 4 films were experimentally studied.The GeSb 2 Te 4 films were prepared by radio frequency(RF)magnetron sputtering,and annealed at 200℃and 340℃under vacuum circumstance,respectively.The adhesion and friction experiments were mainly conducted with a lateral force microscope(LFM)for the GeSb 2 Te 4 thin films before and after annealing.Their morphology and phase structure were analyzed by using atomic force microscopy(AFM)and X-ray Diffraction(XRD)techniques,and the nanoindention was employed to evaluate their hardness values.Moreover,an electric force microscope(EFM)was used to measure the surface potential. It is found that the deposited GeSb 2 Te 4 thin film undergoes an amorphous-to-fcc and fcc-to-hex structure transition;the adhesion has a weaker dependence on the surface roughness,but a certain correlation with the surface potential of GeSb 2 Te 4 thin films.And the friction behavior of GeSb 2 Te 4 thin films follows their adhesion behavior under a lower applied load.However,such a relation is replaced by the mechanical behavior when the load is relatively higher.Moreover,the GeSb 2 Te 4 thin film annealed at 340℃presents a lubricative property.     

硅丙乳液及其建筑涂料的制备和性能研究

先将乙烯基有机硅单体及环状有机硅单体在碱催化下,合成有机硅预聚体,再与丙烯酸酯进行共聚制得硅丙乳液及其建筑涂料。研究了有机硅加入形式、有机硅中间体分子量、有机硅加入量等因素对硅丙乳液及其涂料性能的影响,并与相应的纯丙体系进行比较。结果表明,采用分子量较小的有机硅中间体,有机硅用量为10%左右时所制得的乳液及涂料性能优异,对丙烯酸酯的改性效果明显。     

云南某水电站泄洪消能设计研究

云南某水电站具有洪峰流量大、下游水位高、多泥沙等特点,通过方案比选和水工模型试验研究,推荐采用五表孔泄洪、宽尾墩与跌坎底流联合消能的布置方案。本工程首次提出了宽尾墩与跌坎底流联合运用的消能方式,该消能方式很好的利用宽尾墩良好的消能效果,又克服宽尾墩挑射水流对底板的冲击问题。     

雷达目标特征提取的一种方法

将小波变换和马氏距离相结合，提出了一种基于ISAR成像的雷达目标特征提取方法。对ISAR成像数据进行正交二进Symlet小波分解和门限处理，对数据进行压缩，然后计算压缩后坐标点的马氏（Mahalanobis)距离，得到目标稳定的特征向量。由实验结果看出，此向量具有在一定范围内的不变性，能够用于雷达目标识别。     

汽车空调冷凝器腐蚀试验的表征与评价

介绍了汽车空调冷凝器的腐蚀试验程度及方法，对试验后的冷凝器进行了密封性检查，并用光学显微镜和扫描电镜检测和分析了材料的显微结构，焊接质量，腐蚀性质及其腐蚀深度等。通过对冷凝器的宏微观检查与表征，评价了冷凝器质量的优劣，提出了改进措施与建议。     

束流测量中的工频陷波器

提出了一种应用于电子束曝光机束流测量中的自动跟踪工频陷波器，给出电路结构，基于对其工作原理的分析，介绍了提高陷波器跟踪精度的设计要点及调试方法。     

新型纺织纤维及其染整特性

文章概述了新型纤维纺织品的特点，介绍了目前市场上流行的几种新型纤维（大豆蛋白纤维、竹纤维、PBT和PTT）的基本性能及其染整特性，并指出了它们各自存在的问题。     

A TVD Scheme for Incompressible Flow Coupled With Different Turbulence Modles on A Ground-Mounted Square-RIB Flow

A finite-difference Total Variation Diminishing (TVD) numerical simulation model for coupling the Reynolds Averaged Navier-Stokes (RANS) equations, pressure-relative continuity equation and various k-ε turbulence models was developed to solve the incompressible flow based on the pseudo-compressibility method. The hyperbolicity of all these equations was studied and the discretization of the fully coupling equations with all the primal variables and source terms were made in this article. Numerical simulation for modeling the flow around a ground-mounted square rib was implemented and validated by comparing with the published wind tunnel experimental data. It is shown that such a numerical simulation method with a proper turbulence model has a very good accuracy to simulate the flow around a surface-mounted rib. It is concluded that the Renormalization Group (RNG) and Chen-Kim k-ε turbulence models have much better ability to predict the characteristics of the vortex structure and flow separation than the standard k-ε model.     

石化装置检修的安全管理

针对石化装置的检修特点,阐述装置检修的安全管理和技术工作,对检修时的高风险作业提出明确的要求和注意事项.     

基于Sigmund理论的溅射产额计算及分析

溅射产额是表征溅射效应的重要参数。Sigmund的线性级联碰撞理论在溅射产额计算中获得了广泛的应用和发展。本文对Sigmund理论进行简单介绍，并对基于Sigmund理论的各种经验公式进行分析。在此基础上，对不同条件下的溅射产额进行了计算，通过计算结果，对各种公式的使用范围进行了讨论。