真空浸渍对熔融石英水口增密效果的影响

采用真空浸渍处理工艺，向熔融石英水口试样孔隙内浸入水玻璃溶液，并经过脱钠处理，其材料增密效果十分显著。试验结果表明：浸后试样其体积密度均有不同程度的提高，气孔率下降，其中最为显著者，气孔率下降了4．02％，体积密度达到2．0以上，体积密度的均方差从0．0317减小到0．0074。同时，常温抗压强度亦有所提高。     

Design and Performance Evaluation of Low‐Volume PM2.5 Inlet for Analyzing Chemical Composition

A new PM_2.5 inlet, based on the particle cup impactor configuration, was designed for sampling fine particles smaller than 2.5 μm in aerodynamic diameter and for operating at a flow rate of 5 l/min, as the devices, which are used to analyze the chemical composition of the particles, have good efficiency only at low‐volume flow rates. The performance of the inlet was evaluated in a test chamber, and the optimum dimensions of the particle cup impactor were determined by varying the nozzle‐to‐cup distance. Additional experiments covering flow rates between 3 and 10 l/min with particle sizes between 0.8 and 5.0 μm were carried out in the test chamber. The performance indicated that a nozzle‐to‐cup distance of 1.1 mm would yield a sharp size cutoff. The results from the tests showed that the inlet had a cutoff size of 2.55 μm in aerodynamic diameter at a flow rate of 5 l/min.     

提高Nd:YAG固体激光加工系统焊接质量

在使用现有Nd：YAG固体激光加工系统进行激光焊接时，易产生某些加工缺陷．针对这些缺陷的产生机理进行了分析，并提出了相应的改进措施来避免或减少这些缺陷的产生．实验表明，通过改变激光束的入射角度、增加侧喷嘴喷气保护等改进措施，可以有效地提高焊接质量并延长系统中光学元器件的使用寿命．     

水喷雾灭火系统设计的探讨

简述了水喷雾灭火系统的灭火机理 ,设计参数的选择 ,系统的控制方法 ,以及在设计中的问题和注意事项 ,结合工程实例进行探讨     

精细饰纹件等离子熔射快速制造技术研究

提出了精细饰纹件等离子熔射快速制造技术．在大量实验基础上，着重研究精细饰纹熔射成形及后处理过程中的关键技术问题，详细分析和评价了基模特性、射流特性、粉末特性、熔射枪结构、熔射工艺参数等重要因素对熔射成形件质量的影响，给出了射流图像采集方法、粉末飞行速度和温度的数值模拟模型及测量技术方案，最后进行了典型精细饰纹件的熔射成形实验．研究结果表明：等离子熔射成形技术可以快速制造精细饰纹件，实现成形与加工一体化，且工艺简单、成本低，是极具发展潜力的制造方法．     

用扫描电镜研究喷雾干燥过程中筛颗粒的形成过程

首次用扫瞄电镜研究了喷雾干燥合成中孔分子筛的过程中颗粒的形成过程 ,发现了颗粒自外向内的逐层生长机制 ;用扫描电镜还研究了获得有序结构需要的表面活性剂量和喷雾温度 ;通过透射电镜和X射线观察 ,分子筛中存在有序结构 ,证实了扫描电镜观察的正确性 .     

浅谈光爆锚喷在大型硐室中的应用

阐明了在大型硐室中应用光爆锚喷技术参数的确定，依据实践观测对其技术经济效益进行了评价。指出光爆锚喷技术具有成本低，施工速度快的特点，可大大降低工人的劳动强度，安全可靠并能获得较好的经济效益。     

RP-HPLC法测定甘辛喷雾剂中甘草酸的含量

应用反向高效液相色谱法测定了甘辛喷雾剂中甘草酸含量，流动相为甲醇：0．2mol／L醋酸铵：冰醋酸(67：33：1)，紫外检测波长为250nm。结果表明：甘草酸在0．04～0．5μg／mL范围内线性关系良好，r=0．9999，平均加样回收率为100．67％。此法简便稳定、快速准确，空白无干扰，适用于该制剂质量控制中测定甘草酸的方法。     

Numerical investigation of the spray-mesh-turbulence interactions for high-pressure, evaporating sprays at engine conditions

This work presents a numerical methodology to simulate evaporating, high pressure Diesel sprays using the Eulerian-Lagrangian approach. Specific sub-models were developed to describe the liquid spray injection and breakup, and the influence of the liquid jet on the turbulence viscosity in the vicinity of the nozzle. To reduce the computational time and easily solve the problem of the grid dependency, the possibility to dynamically refine the grid where the fuel-air mixing process takes place was also included.The validity of the proposed approach was firstly verified simulating an evaporating spray in a constant-volume vessel at non-reacting conditions. The availability of a large quantity of experimental data allowed us to investigate in detail the effects of grid size, ambient diffusivity and used spray sub-models. In this way, different guidelines were derived for a successful simulation of the fuel-air mixture formation process. Finally, fuel injection and evaporation were simulated in an optical engine geometry and computed mixture fraction distributions were compared with experimental data.