喷油泵卡滞的原因及处理

喷油泵卡滞的原因对于旧喷油泵,其卡滞原因多为柴油不干净,柱塞与柱塞套之间有机械杂质．柱塞与柱塞套表面被拉伤,或柱塞顶棱角处被磕碰产生毛刺所致;对于新喷油泵．其卡滞原因有以下2点：①喷油泵生产厂家及维修单位在调试喷油泵时。不注意选用优质柴油．致使调试所用柴油中实际胶质含量较大,酸度较高。     

The use of hydrogen as a fuel for inland waterway units

Escalating apprehension about the harmful effects of widespread use of conventional fossil fuels in the marine field and in internal combustion engines in general, has led to a vast amount of efforts and the directing of large capital investment towards research and development of sustainable alternative energy sources. One of the most promising and abundant of these sources is hydrogen. Firstly, the use of current fossil fuels is. discussed focusing on the emissions and economic sides to emphasize the need for a new, cleaner and renewable fuel with particular reference to hydrogen as a suitable possible alternative. Hydrogen properties, production and storage methods are then reviewed along with its suitability from the economical point of view. Finally, a cost analysis for the use of hydrogen in internal combustion engines is carried out to illustrate the benefits of its use as a replacement for diesel. The outcome of this cost analysis shows that 98% of the capital expenditure is consumed by the equipment, and 68.3% of the total cost of the equipment is spent on the solar photovoltaic cells. The hydrogen plant is classified as a large investment project because of its high initial cost which is about 1 billion US$; but this is justified because hydrogen is produced in a totally green way. When hydrogen is used as a fuel, no harmful emissions are obtained.     

杭州地铁1号线过江隧道特殊地质施工方法

介绍杭州地铁1号线穿越钱塘江隧道采用的土压平衡盾构法.由于地质情况复杂,盾构施工要同时克服卵石层、高承压水、有害气体(主要为甲烷)三大难题.论述在这些特殊地质条件下采取的掘进施工工艺,有效地克服了以上难题,保证工程安全顺利进行.     

为什么要给轮胎充氮气

首先，轮胎充氮气就是利用了氮气受热后，不容易与别的物质发生化学反应，体积随温度变化不大这些特性（即：将空气当中更为活跃的氧气、水分和其它杂质去除）。利用氮气的隋性，降低轮胎内部因高温产生烯类气体自然爆胎的机率。同时，避免轮辋老化腐蚀，有效的延长轮胎的使用寿命。另外，氮气和一般空气相比，氮气的体积不会随着温度升高或降低发生较大变化，     

热脱附-气相色谱/质谱法测定船用涂料释放气体

船舶舱室中使用大量涂料,这些涂料在使用过程中不断地向舱室内释放有害气体,从而使船舶环境舱舱室空气受到污染。本文建立了热脱附-气相色谱/质谱法测定船舶用涂料释放有害气体的检测方法。将船用涂料刷于铝板上并晾干30d后,置于不锈钢密闭容器中进行密封,在25℃、50℃温度下进行加热并保持72h。以填装TenaxTA吸附剂的采样管对密闭容器中释放的有害气体进行富集,以热脱附系统对浓缩采样管进行脱附,气相色谱/质谱仪(GC/MS)进行分析,共定性检测到烃类、醛类、酮类等挥发性有机物。     

柳铁地区接触有害作业因素人员体检结果分析

目的：了解接触有害作业因素对人体健康的影响。方法：用SPSS软件对接触有害作业因素的497人的体检结果进行统计分析。结果：阳性观察对象7例，各种职业禁忌症者32例。结论：阳性观察对象应定期检查，职业禁忌症者应调换工种，并做进一步治疗。     

改进的TCD在分析腐蚀性气体中杂质的应用

通常会遇到利用热导检测器(TCD)来分析腐蚀性样品。当较多量腐蚀性的样品通过检测器时,通常会损坏热丝。本文采用安捷伦单丝TCD来分析腐蚀性气体。通过分析三氟化氮(NF3)的实例,来将改进的TCD与标准双热丝或四热丝TCD进行对比。     

欧洲SCR选择性催化还原技术的发展状况

目前，几乎所有的欧洲载货汽车制造商，比如达夫、依维柯、梅赛德斯-奔驰、雷诺以及沃尔沃公司，为了减少载货汽车尾气中有害成分的排放，均采用了SCR选择性催化还原技术（Selective Catalitic Reduction)。     

8K机车直流侧故障分析

针对8K机车电流传感器引起的直流侧故障进行了分析，指出产生故障的原因，提出了判断其故障的方法和解决措施，取得了良好的效果。