气门二次调整法在多缸V型发动机中的应用

正确的气门间隙对发动机正常运转、保持良好的性能是非常重要的。由于发动机的各气缸分布不同,做功的间隔角不同,使其气门间隙的调整各有差异。为此,结合多缸V型发动机曲轴配角、做功间隔角以及发火顺序等基本工况和原理,通过实例分析,探讨了二次调整法在多缸V型发动机气门间隙调整中的应用。     

不同降解阶段填埋垃圾体的气体渗透特性研究

通过对不同降解阶段填埋垃圾体渗透系数的测定，研究了在不同压实密度、不同含水率条件下垃圾体渗透特性的变化情况，实验表明：1.对不同降解阶段的填埋垃圾体，新鲜垃圾及混和垃圾的渗透系数接近，腐熟垃圾明显高于前两者；随压实密度增加，其气体渗透系数均呈指数规律递减；2.随着垃圾体含水率的增加，腐熟与新鲜垃圾的渗透系数均呈线性规律递减，含水率对渗透系数的影响要远小于压实密度的影响；3.新垃圾、混合垃圾、腐熟垃圾均具有较显著的各向异性特征，在典型压实密度下，水平方向的气体渗透系数Kh为垂直方向渗透系数Kv的3.5-27.3倍。     

高效产氢发酵细菌在不同气相条件下产氢

气相条件是影响高效产氢细菌产氢能力的重要生态因子之。间歇实验结果表明，空气中的氧分子是抑制高效产氢细菌－B49生长发酵的直接原因，二氧化碳也对B49的发酵产氢产生很大的抑制作用，而以氮气和氩气为气相能使B49发挥较高的产氢能力，氮气很可能对B49的发酵产氢有一定的促进作用。     

Quality and maximum profit of industrial tomato as affected by distribution uniformity of drip irrigation system

The tomato industry reformed its system of payment by weight of tomato, introducing a corrective system based on percent level of fruit dry matter produced. Such a decision implies significant changes in the management of irrigation systems, with a need to emphasize the technological quality of the marketable product. Three levels of distribution uniformity of the irrigation system are analysed, and related production functions of crop yield and percent of dry matter are presented as well as their use on the optimisation of dry matter, expected revenues and seasonal applied water. Results are critically influenced by the distribution uniformity. They demonstrate the inter-relationship between crop production, percent fruit dry matter and irrigation management, and the importance of considering non-uniformity in the economic analysis of industrial tomato production. Decreases in uniformity lead to a reduction in dry matter production per unit land. Decreases in dry matter are also observed with increasing levels of seasonally applied water, with the optimal level always lower than the required for maximum yield. Such interaction suggests a continuous and inverse relationship between profit and water applied. However, due to the corrective system of payment, by levels of percent of dry matter produced, for some uniformity, the expected revenue follows the yield-water production function instead of the dry matter function. This fact introduces disturbances in the optimal water applied inducing higher than expected levels of water applied for profit maximisation. The simulated data also show that incentives to switch to new systems or management practices able to raise the distribution uniformity result more from profit losses than increases in water price.     

基于高压电技术的烟气脱硫研究与应用进展

分析与评述了国内外基于高压静电技术的烟气脱硫研究与应用进展,介绍了几种以高压电技术为基础的烟气脱硫新技术--电子束烟气脱硫、脉冲电晕等离子法脱硫、荷电干法烟气脱硫和荷电喷雾烟气脱硫技术;并且分析了这几种烟气处理技术的作用原理、特点和发展现状,展望了其应用前景.     

干旱缺水灌区节水灌溉评价标准及其分析

在分析节水灌溉定义内涵的基础上，提出了评价干旱缺水灌区农田节水灌溉的目标标准和技术标准，并对这些评价标准的运用进行了讨论。     

锅炉循环水泵机械密封设计探讨

通过IR型热水循环泵轴封结构的更新设计实践，阐述了在水温150℃下机械密封的正确设计方法和组合式密封结构专利技术的优点。实践表明，该组合式密封结构作为锅炉热水循环泵的轴封使用是可行的，可以推广应用。     

水稻旱作覆膜节水增产试验研究

通过水稻旱作全程覆膜与半程覆膜、旱作不覆膜及水栽对比试验，研究其耗水规律，计算其节水量与增产量，并进行经济效益分析，提出了适合本地区的栽培模式。     

外加剂和掺和料对砂浆性能影响的

当前，在水工棍凝土工程中，抹而砂浆的强度和抗渗性能越来越受到人们的重视通过对比试验，研究了减水剂、引气剂单掺、复掺及与硅粉、粉煤灰复掺，对砂浆强度和抗渗性能的影响，并从机理方面分析它们改善砂浆性能的原因结论是:减水剂、引气剂与硅粉、粉煤灰适当配比复掺，对砂浆的强度和抗渗性能的改善显著     

便携式气体分析仪在柴油机排放测试中的应用

利用便携式气体分析仪在内燃机测试台架上对柴油机按照工况试验循环进行了废气排放分析测试,并对测试结果的有效性进行了分析与评判。