光电跟踪设备载车副车架设计和有限元分析及实验

首先介绍了单车承载光电跟踪设备的必要性,然后根据设计要求,确定副车架的材料(12Mn)和副车架梁的截面形状(槽钢),再根据以往的经验和减振性能的要求,设计出副车架。建立有限元模型,在三维仿真软件(MSC.PAT-RAN)中对模型进行应力及振动分析,检验副车架的力学性能及减振性能。最后通过实验检验副车架的力学性能及减振性能。     

Macro-architectured cellular materials: Properties,characteristic modes,and prediction methods

Macro-architectured cellular (MAC) material is defined as a class of engineered materials having configurable cells of relatively large (i.e., visible) size that can be architecturally designed to achieve various desired material properties. Two types of novel MAC materials, negative Poisson’s ratio material and biomimetic tendon reinforced material, were introduced in this study. To estimate the effective material properties for structural analyses and to optimally design such materials, a set of suitable homogenization methods was developed that provided an effective means for the multiscale modeling of MAC materials. First, a strain-based homogenization method was developed using an approach that separated the strain field into a homogenized strain field and a strain variation field in the local cellular domain superposed on the homogenized strain field. The principle of virtual displacements for the relationship between the strain variation field and the homogenized strain field was then used to condense the strain variation field onto the homogenized strain field. The new method was then extended to a stress-based homogenization process based on the principle of virtual forces and further applied to address the discrete systems represented by the beam or frame structures of the aforementioned MAC materials. The characteristic modes and the stress recovery process used to predict the stress distribution inside the cellular domain and thus determine the material strengths and failures at the local level are also discussed.     

激光选区烧结成型材料的研究和应用现状

介绍激光快速成型的原理及SLS对材料性能的要求,概括激光选取烧结成形技术中各种材料的研究和应用现状,分析SLS技术产业化存在的问题及可能解决的途径。     

Durability of a polymer composite material and service life of packing elements of contact movable sealing devices

The serviceability and durability of a new polymeric composite material based on polytetrafluoroethylene are studied. The material preserves its mechanical and tribological parameters under prolonged exposure to conditions of elevated temperature and uniform compression. The material is shown to be useful in raising the reliability and service time of reciprocating sealing devices.     

有机热载体炉产品制造监检浅谈

随着锅炉参数的不断提高,安全保障工作显得越来越重要,制造质量是安全保障的首要环节,通过产品监检,是提高产品的制造质量的一种有效途径。有机热载体炉监检过程中,虽然只有少部分制造要求与蒸汽锅炉有所区别,监检员在明白两者之间的区别后,能更好的保证有机热载体炉的监检品质,达到保障设备的安全使用的目的。     

Topography and performance of gas-sensing devices: An AFM study

The topography of resistive Ga₂O₃ metal oxide sensing devices was examined and characterized with an atomic force microscope (AFM). The sensing devices do not have to be destroyed for characterization and stay fully functional. Deposition of nobel metal dispersions, for example, palladium (Pd), onto the sensor surface improves its properties by adding catalytic activity. The distribution of the Pd clusters was investigated.     

电致发射蓝光和蓝绿光的有机薄膜的研究进展

概述了电致发射蓝光和蓝绿光的电致发光薄膜器件的结构、材料、发光机理、目前研究的状况、出现的问题以及研究的发展趋势。     

有机热载体炉循环泵工艺参数的确定

指出了有机热载体锅炉循环泵工艺参数的影响因数及确定工艺参数的意义，并分析了导热油种类和泵的安装方式对循环泵工艺参数的影响，给出了工艺参数的确定方法。     

轴承专用测量仪调整与使用的误差分析

对轴承测量误差的产生原因进行了全面的分析,并总结了各种误差的解决办法及正确的仪器调整方法,对提高测量精度、减少测量误差、提高产品质量具有重要意义。     

有机碱对铜CMP材料去除率作用的实验研究

分别使用几种有机碱作为络合剂、SiO2水溶胶为磨料、H2O2为氧化剂,复配后分别进行相同工艺参数的抛光试验。试验结果表明:乙二胺强络合作用明显,对铜的去除率最大可以达到850.8 nm/min,表面粗糙度Ra=13.540°A;二羟基乙基乙二胺和二乙醇胺去除率较低,本试验中最大分别为71.8 nm/min和25.1 nm/min。乙二胺适合用于碱性环境下的ULSI铜抛光液,材料去除率较高的原因是有效的强络合作用与抛光参数相匹配以及化学作用和机械作用动态平衡的结果。