聚硅烷的电子特性及非线性光学材料

综述了聚硅烷的电子结构、光吸收特性。重点介绍了聚硅烷在非线性光学材料中的研究与应用。     

Computational analysis of thin coating layer failure using a cohesive model and gradient plasticity

Thermal barrier coatings (TBC) are widely used to prevent transient high temperature attack and allow components high durability. Due to strong inhomogeneous material properties the TBC failure often initiates near the interface between the brittle oxide layer and the ductile substrate. A reliable prediction of the TBC failure requires detailed information about the crack tip field and the consequent fracture criteria. In the present paper both cohesive model and gradient plasticity are used to simulate the failure process and to study interdependence of the interface stress distribution with the specific fracture energies. Computations confirm that combination of the two models is able to simulate different failure mechanisms in the TBC system. The computational model has the potential to give a realistic prediction of the crack propagation process.     

化学复合镀层激光处理研究

研究了激光处理对Ni-P -SiC化学复合镀层的影响。借助于扫描电镜、能谱仪、X射线衍射、显微硬度计等设备对激光处理后复合镀层的表面形貌、组织结构及性能进行了综合分析。结果表明 ,对复合镀层进行激光处理可以获得与炉内加热同样的镀层硬度 ,且当激光功率 4 0 0W ,扫描速度 1.5m /min时 ,镀层硬度高于炉内加热的硬度     

堆石料与基岩面直剪试验

介绍了堆石料与基岩面的现场直剪试验方法，6个组次的直剪试验结果表明，堆石料与基岩面的抗剪强度指标随基岩面坚硬度的增大而增加，并随基岩面粗糙度的加大而加大。     

胶性材料在混凝土坝裂缝处理中的应用

介绍了观音阁坝被埋水下6年越冬停浇面水平裂缝采用“粘贴T1密封胶及表面粘三元乙丙后锚固”的处理方案。结果表明,利用胶性材料处理运行中的重力坝迎水面裂缝,技术可靠,方法简单,经济合理。     

高密度互连印制板

本文阐述了RCC材料与化学蚀刻法制作高密度互连印制板的工序和详细方法,意在探寻最为经济、简单而又行 之有效的工艺。     

晶须取向对SiCw/6061Al复合材料热压缩变形行为的影响

采用SEM 和 Magiscan-2A 图像分析系统研究了晶须取向对SiCw/6061Al复合材料在300℃压缩变形行为的影响.结果表明:晶须取向影响着晶须折断程度和转动角度; 随着晶须取向角的增加,晶须转动和折断行为所导致的软化效果下降.同时晶须取向也影响复合材料的热压缩应力-应变曲线的形状.在热压缩变形过程中,晶须取向角为0°和30°的复合材料表现出明显应变软化现象, 晶须取向角为45°的复合材料无明显软化现象.晶须取向角为90℃的复合材料表现出应变硬化现象.     

新型微光探测器激光防护材料的研究

系统分析了微光夜视器的结构及其原理，并结合当前器件存在的激光致盲威胁，提出了增强系统安全的新措施。同时，系统地介绍了防激光滤光材料一些重要的性能参数以及滤光材料的组成、制备加工工艺。研究结果表明，新型的防激光材料能够有效地防护800nm，900nm以及10613nm等三个波长的激光，并且可见光透过率大于85％。     

Non-equilibrium particle motion in the vicinity of a single blade

The motion of sand particles close to a single moving blade was investigated using Positron Emission Particle Tracking (PEPT) during the period in which the free bed surface profile was evolving to an equilibrium shape. The area affected by the blade was divided into active and inactive regions and these were analysed separately. The characteristic heart-shape of the active region in the plan view was determined. An approximately 10-particle-diameter wide velocity transition zone is found between the two regions. While the tracer particle is in the inactive region moving away from the blade, the time dependence of the axial displacement is well described by a logarithmic relationship. The probability of particle movement towards the centre of the blade was quantified using a “central tendency” index. The calculated central tendency shows maxima at each side of the blade. The separation of the two maxima, which indicates the width of the active region, increases with fill level but is independent of rotational speed.     

光学材料的激光微加工研究进展与应用前景

综述了国内外在光学材料激光微加工方面的研究成果和应用状况，并展望了其发展前景。