型腔体组件装配尺寸检测技术分析与运用

为解决型腔体组件装配尺寸的检测问题,以某枪型的型腔体组件为例,分析该型腔体组件的结构特点,设计组合型检测装置,实现准确检测目的.归纳总结了型腔体组件装配尺寸检测技术运用过程中检测装置的设计要领,采用设计与被测型腔体组件相匹配的组合型检测装置,有效解决了型腔体组件装配尺寸检测过程中的定位困难、操作繁琐、检测准确性差等问题.该检测技术对确保型腔体组件装配尺寸的检测稳定性、检测可操作性、检测准确性等方面具有现实的指导意义.     

烧劣质低挥发分燃料700t/d预分解窑的综合优化改造

七里岗水泥厂700t／d预分解窑使用劣质低挥发分煤时，熟料产量仅619t/d。对窑系统热工检测和诊断后，对预热预分解系统进行了个性化技改，72h达标考核期间熟料平均产最达到918t／d。     

基于GIS技术的农村非点源污染分析——以渠县境内巴河州河汇流断面上游区域为例

为了有效地分析巴河州河汇合口(渠县境内)以上流域非点源污染问题,应用GIS技术进行水文分析(水系提取、流域划分)以及污染源的空间分异分析。基于评估区的水环境污染现状,选取城镇居民生活污水、农村居民生活污水、城镇地表径流、集中式畜禽养殖、化肥污染五大污染源,采用源强系数法和输出系数法进行COD、TN、TP 3种污染物的流失量计算,并分析其污染负荷,。结果表明:(1)评估区的91.93%的负荷来源于为农村居民生活污水、化肥污染、和城镇居民生活污水,最主要的污染源为农村居民生活污水。(2)评估区重点治理乡镇为三汇镇。研究成果较为清晰地分析出研究区非点源污染的分布情况,指出了需要重点治理的地域和污染源。     

树脂固体酸催化剂用于合成尿囊素研究

对三阳离子交换树脂在乙醛酸与尿素缩合反应中的催化活性进行了研究。实验得到其最佳反应条件为：尿素与乙醛酸摩尔比4：1，反应温度70℃，反应时问8h。在此条件下，尿囊素产率达到69．6％。实验结果还表明，阳离子交换树脂催化剂优于HZSM-5分子筛催化性能。     

丙烯酸酯聚氨酯/SiO2纳米复合涂层结构与形态对其耐刮伤性影响研究

以四乙氧基硅烷(TEOS)作为主要前驱体,通过改变溶胶-凝胶工艺参数制得了结构和形态各异的丙烯酸酯聚氨酯/SiO2纳米复合涂层,利用TEM、SAXS等手段表征涂层的结构与形态,由洗刷前后涂层的失光率来表征耐刮伤性,详细探讨了纳米复合涂层耐刮伤性与SiO2相特征、有机无机相作用力及SiO2质量分数之间的关系。研究表明:丙烯酸酯聚氨酯涂层中引入纳米SiO2相后,耐刮伤性明显提高。有机相与SiO2相之间的作用力是影响涂层耐刮伤性的最重要因素,作用力越强,耐刮伤性越好。网络状纳米SiO2与颗粒状纳米SiO2相比,更有利于耐刮伤性的提高,且网络状纳米SiO2质量分数越大,耐刮伤性越佳,但SiO2相的致密度和尺寸对耐刮伤性影响较小。对于颗粒状胶体SiO2,在15~160 nm范围内,粒径对耐刮伤性没有明显影响;随着胶体SiO2粒子的质量分数增加,耐刮伤性先增大后减小。     

Synthesis and surface characterization of poly(methyl methacrylate)‐block‐polydimethylsiloxane copolymers from macroazoinitiator

Poly(methyl methyacrylate)‐block‐polydimethylsiloxane (PMMA‐b‐PDMS) copolymers with various compositions were synthesized with PDMS‐containing macroazoinitiator (MAI), which was first prepared by a facile one‐step method in our lab. Results from the characterizations of X‐ray photoelectron spectroscopy (XPS), contact angle measurements, and atomic force microscopy (AFM) showed that the copolymer films took on a gradient of composition and more PDMS segments enriched at the film surfaces, which then resulted in the low surface free energy and little microphase separation at the film surfaces. By contrast, transmission electron microscopy (TEM) analysis demonstrated that distinct microphase separation occurred in bulk. Slight crosslinking of the block copolymers led to much steady morphology and more distinct microphase separation, in particularly for copolymers with low content of PDMS. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Low-temperature catalytic combustion of methane over MnO x –CeO2 mixed oxide catalysts: Effect of preparation method

The effect of preparation method on MnO _x –CeO₂ mixed oxide catalysts for methane combustion at low temperature was investigated by means of BET, XRD, XPS, H₂-TPR techniques and methane oxidation reaction. The catalysts were prepared by the conventional coprecipitation, plasma and modified coprecipitation methods, respectively. It was found that the catalyst prepared by modified coprecipitation was the most active, over which methane conversion reached 90% at a temperature as low as 390 °C. The XRD results showed the preparation methods had no effect on the solid solution structure of MnO _x –CeO₂ catalysts. More Mn⁴⁺ and richer lattice oxygen were found on the surface of the modified coprecipitation prepared catalyst with the help of XPS analysis, and its reduction and BET surface area were remarkably promoted. These factors could be responsible for its higher activity for methane combustion at low temperature.     

军事训练能力要素研究

军事训练能力是作战能力生成发展的重要基础和可靠保证。系统地研究了军事训练能力的概念和构成要素,提出了训练本领集成和训练力量体现的军事训练能力新概念,分析了军事训练能力的3个要素和各要素之间的相互作用及运行过程。     

一种适合底水油藏的调驱剂体系研究

考察温度、盐度等因素对优选NPLS凝胶颗粒体系的影响,评价聚合物复合NPLS凝胶颗粒体系的调驱效果。实验表明：随着温度的增加,NPLS凝胶颗粒体系的膨胀倍数增加;随着盐度的增加,体系的膨胀倍数减小;在长填砂管物模调驱实验中,聚合物复合NPLS凝胶颗粒体系具有良好的注入性。