输油管道的冷冻封堵技术

原油的管道输送大大降低了输送损失,提高了输油效率。近30年来,世界各国先后研制成功了包括机械和低温方法在内的几种封堵技术.冷冻封堵技术采用液氮作为制冷剂,也是目前最有效的封堵技术.在第一部分比较了几种封堵技术的优缺点.第二部分简要通报了新研制成功的阶裂补偿加强结构.这种结构可以用来防止16Mn 钢制输油管道的低温冷脆现象.用1:1模拟工程的多次试验证明,这种结构安全可靠、施工简单迅速、价格低廉、有推广使用的价值.     

Si衬底上横向外延GaN材料的微结构和光学性质的研究

用氢化物气相外延 (HVPE)方法在Si(III)衬底上成功横向外延生长出晶体质量较好的GaN薄膜材料。透射电子显微镜 (TEM )的研究结果表明 ,横向外延区域GaN的位错密度明显减小。由于SiO2 掩膜腐蚀角的不同 (分别为 90°和 6 6°) ,导致了横向外延GaN材料一些独特的微观形貌。微区拉曼光谱由数百条拉曼散射曲线组成 ,每一条曲线有三个振动模 ,分别对应Si振动模式 (5 2 0cm- 1) ,E2 模式 (5 6 6cm- 1)和E1(LO)模式(732cm- 1)。在垂直条纹方向 ,峰位和峰宽没有明显的变化 ,而峰强约 5 μm会发生周期性变化     

安哥拉吉拉索原油评价

对安哥拉吉拉索原油及其宽馏分的性质进行了分析评价，分析结果表明，该原油属低硫中间基中质原油，并针对各馏分提出了合适的加工方案。     

石墨化钢等温淬火后的力学性能和减振特性

与球墨铸铁比较，在石墨化钢中，由于含碳量较低，因而低强度和低塑性的石墨含量较少，这就有可能采用热塑性变形和随后热处理的方法来获得较好的强度和塑性的组合。本文对石墨化钢和球墨铸铁不同热处理后性能进行了对照分析。     

Relationship Between Coal Powder and Its Combustibility

Coal‘s volatile component ,ash and fixed carbon content have different function in different stages of a combustion process,but the traditional coal classification can precisely show its combustion property.In this experiment coal‘s evaluation indeves(ignition index Di),(burn off index Df) were used to qualitatively show the ignition property and combustion ending property of coal samples.Meanwhile,considering actual heating circumstances in calciner(in cement plants),this thesis established the relationship among the ignition index,burn off index and coal‘s industrial analysis value,which makes it possible for the user to predict the quality of coal before using it and is very valuable in practice.     

Effect of Thickness on the Structure and Tribological Properties of MoSx Coating

MoSx coatings were prepared by bipolar-pulse DC unbalanced magnetron-sputtering system with the variation of coating thickness at different Ar pressures.The composition and surface morphology were determined by using energy dispersive X-ray and scanning electron microscopy;the structural characterization was analyzed by X-ray diffraction.The friction and wear properties were investigated by fretting tests in air with less than 10% and 50% relative humidity.At 0.40 Pa pressure,(002) basal plane orientation was formed throughout the coatings.At 0.88 Pa and 1.60 Pa pressures,(002) basal plane orientation was only noticed in the first stage of coating growth(around 0.20 μm in thickness), and then edge orientations with their basal planes perpendicular to the surface would be evolved in the coatings.Humidity has a minor influence on the coatings that have(002) basal plane orientation,whereas the tribological properties of MoSx coatings with edge orientations are greatly affected by humidity.The mechanisms of coating growth and friction and wear processes are discussed.