气相色谱法测定火药中异丙醇、乙酸乙酯和苯的含量

用气相色谱法对火药中异丙醇、乙酸乙酯和苯的含量进行测定。样品用甲醇提取,采用氢火焰检测器检测,检测器温度200℃,柱箱温度145℃,气化室温度190℃,载气为氮气,流速50 m L/min,外标法定量。该方法对异丙醇、乙酸乙酯和苯的最低检测浓度为0.5,0.3,0.6μg/m L;在5~100μg/m L浓度范围内均呈良好的线性关系,线性系数r0.990;方法回收率在94.8%~96.5%之间,相对标准偏差(n=6)在2.5%~3.6%之间。符合火药质量检测的要求,方法可用于火药中异丙醇、乙酸乙酯和苯含量的检测。     

Transformation of ZnO polycrystalline sheets into hexagon-like mesocrystalline ZnO rods (tubes) under ultrasonic vibration

The mesoscale assembly process is sensitive to additives that can modify the interactions of the crystal nucleus and the developing crystals with solid surfaces and soluble molecules. However, the presence of additives is not a prerequisite for the mesoscale transformation process. In this study, ZnO sheet networks were synthesized on Al foils by a hydrothermal process. Scanning electron microscopy and transmission electron microscopy images confirmed that under ultrasonic vibration, monolithic polycrystalline ZnO sheets transformed into hexagon-like mesocrystalline tubes or rods. The formation mechanism was discussed.     

催化水解法低温脱除煤气中羰基硫的研究

采用等体积浸渍法制备了负载钼酸铵、碳酸钾、氢氧化钠3种活性组分的氧化铝基水解催化剂,考察了氧含量、温度、湿度对羰基硫水解转化率的影响。实验结果表明,随着氧含量的增加,催化剂反应活性降低;随着温度的升高,催化剂反应活性提高。水蒸气在低含量时可促进水解反应进行,但含量过高则会造成催化剂反应活性的下降。该催化剂在80~100℃,湿度25%条件下具有优异的水解活性和稳定性。     

一种航空相机机载任务处理系统设计

航空相机安装在航空飞行器上,用于获取高质量的航拍图像。航空相机在机载环境下工作时,需要为像移补偿组件提供姿态和飞行参数使其工作,同时需要发出工作指令并监控航空相机返回的信息。为此提出了一套机载任务处理系统系统,采用高端工业计算机和多通道串行总线接口卡为硬件平台,设计了系统的人机交互软件,实现对机上惯导系统的飞行参数接收并接收人工输入的工作指令,使相机正常工作。对系统组成、模块的功能、总线数据收发信息的处理机制进行了描述。使用该系统控制某航空相机空中工作,所获取的图像清晰满足指标要求,这表明该系统工作正常,性能稳定。     

地下矿业遗迹保护与开发——湖南宝山矿山公园

矿业遗迹是矿山公园的核心景观,也是人类重要的物质与文化遗产。矿业遗迹的保护、利用是矿山公园设计成败的关键。由于地下矿业遗迹的保护与开发在当今矿山公园建设中尚面临困难,本文结合湖南宝山矿山公园规划实践,通过深入挖掘宝山矿业开发史及矿业遗迹,结合具体景点设计,总结了地下遗迹保护开发的设计理念,初步提出四种设计型式,为我国矿山公园地下遗迹保护开发提供借鉴。     

一种分散稳定剂的合成及应用

文章合成了一种阴离子型分散聚合稳定剂;特性粘数2～4dL/g,浓度20%,表观粘度200～300mPa·s该稳定剂兼有高分子和表面活性剂的特点,具有优异的分散稳定作用;使用该稳定剂合成的聚丙烯酸分散液,分散粒子总比表面积0.28m2/g,表面积平均粒径19.33μm,体积平均粒径为228.82μm。稳定期大于半年。     

炭黑分散度对混炼胶物理机械性能的影响

分散度是胶料的重要性能标准,本文通过对全钢胎面胶配方实验数据的整理,进一步分析了炭黑分散度对胶料物理机械性能的影响,总结出隐藏在外部因素干扰下的影响规律:分散度越好全钢胎面胶的物理机械性能就越好。     

直接二甲醚燃料电池的研究进展

综述了近几年来关于最具商业前景的直接二甲醚燃料电池的研究成果,文中主要探讨了新型阳极催化剂的开发,膜电极结构对电池性能的优化以及操作条件对电池性能的影响。建议在深入对催化剂、电池结构和操作条件的研究基础上,采用碱性电解质饱和二甲醚为燃料和双氧水替代氧气为氧化剂等方法进一步提高电池性能。     

Effect of additives introduced by ball milling on sintering behavior and mechanical properties of hot-pressed B4C ceramics

The ball-milling process is a usual route employed to break up agglomerates in the powder or mix the powder with additives when preparing ceramics. Although it is well known that a powder can be “contaminated” by the wear particles from the milling balls, the study dealing with how the preparation and properties of a hard material would be affected by additives just introduced by scrape of milling balls has been scarce. In the present work, sintering behavior and mechanical properties of hot-pressed B₄C with additives derived from milling balls were investigated. Polyoxymethylene, ZrO₂, Al₂O₃ and Si₃N₄ were selected as different ball materials. The results show that the sinterability of B₄C could be significantly enhanced because of the incorporation of one of these additives, i.e. ZrO₂, Al₂O₃ and Si₃N₄ (approximately 3–6 vol%). As a result of improvement in density, excellent mechanical properties of B₄C ceramics were obtained. Among them a flexural strength of B₄C added by ZrO₂ reached 630 MPa.     

铋掺杂铝硅酸盐玻璃的超宽带近红外发光性质

采用高温熔融法制备了组分为50SiO_2-xAl_2O_3-(50-x)MgO-Bi_2O_3(x=5,10,15,20,摩尔比)的铋掺杂铝硅酸盐玻璃。研究了铋掺杂铝硅酸盐玻璃超宽带近红外发光性质,探讨了玻璃基质的光学碱度对铋离子宽带发光特性的影响。结果表明:在690nm和808nm的激发下,铋掺杂铝硅酸盐玻璃的红外荧光中心分别位于1106nm和1294nm;随光学碱度的增强,铋离子的红外发光强度减弱。并对铋离子超宽带发光的机理进行了探讨,认为其红外发光源于低价的Bi~+和Bi~(2+)。