柴油机微粒生成及控制技术

在总结柴油机微粒排放的生成机理的基础上,分析了影响柴油机微粒生成的各种因素。通过对柴油机微粒各种净化方式的比较,总结指出了柴油机微粒处理的发展趋势。     

The contribution of road traffic to particulate matter and metals in air pollution in the vicinity of an urban road

A detailed investigation was conducted to study the sources of particulate matter in the vicinity of an urban road in Žilina. To determine the amount of particulate matter (PM₁₀, PM_2.5 and PM₁) present in the ambient air, a reference gravimetric method was used. The main objective of this contribution was to identify the sources of these particles by means of statistical methods, specifically principal component analysis (PCA), factor analysis (FA), and absolute principal component scores (APCS), as well as using the presence of 17 metals in the particulate matter (Na, Mg, Al, Ca, V, Cr, Fe, Mn, Ni, Cu, Zn, As, Mo, Sb, Cd, Ba, Pb). To identify the metals in the particulate matter samples and to determine their abundances, spectroscopic methods were used, specifically inductively coupled plasma mass spectrometry (ICP-MS). Each of these metals may come from a specific source, such as the burning of fossil fuels in fossil fuel power plants; local heating of households; the burning of liquefied fossil fuels in the combustion engines of vehicles; the burning of coal and wood; non-combustion related emissions resulting from vehicular traffic; resuspension of traffic-related dust; and industry. Diesel vehicles and non-combustion emissions from road traffic have been identified as two key sources of the particulate matter. The results reveal that non-combustion emissions, which are associated with the elements Na, Fe, Mn, Ni, Zn, Mo, Sb, Cd, and Pb, are the major contributors, followed by combustion emissions from diesel vehicles, which are associated with the elements Mg, Ca, and Ba.     

CCS万吨级船舶船体建造中多种新型胎架应用及探讨

阐述了胎架在中小型船舶建造中对于严格控制船体线型的重要作用,以及胎架在制造中必须具有足够的强度及钢度才能满足使用要求,对保证船体分段建造质量和精度控制起到了指导作用.     

D10型凹底平车改造及厂修

介绍了D10型凹底平车的发展概况、车辆结构及性能参数,对1996年以前生产的第3代D10型车的改造原则、改造及厂修内容、关键技术以及试验和验证等做了说明,并介绍了改造运用效果。     

大型起重设备应对突发性强阵风的措施

为防止突发性强阵风对港口安全生产的危害,应结合实际制定和落实有效的防风措施,同时密切关注天气变化,紧急情况下正确应对.安装在流动式起重机上的风级风速报警仪,要根据各地的地貌特征,最好采用实测的办法,找到合适的大风报警设定值.     

车载PM2.5检测标定方法的研究

设计和搭建环境温度标定台架和整车乘客舱模拟台架系统,制定PM2.5总成传感器的标定方法;通过标定台架的模拟试验,从温度性、净化速率影响等方面对其是否能满足性能要求进行验证分析。     

10000kN液压机液压系统故障分析

分析10 000 kN液压机液压系统不能加压的故障原因,利用故障树分析法逐步查找出故障,并加以解决,认为故障树分析法是液压系统故障分析、解决的实用方法。     

ECA-10超薄磨耗层在高速公路预养护中的应用

ECA超薄磨耗层技术是一种新型的路面设计方法,主要应用于高等级路面的预防性养护,也可以作为新建道路的表面磨耗层.笔者结合在界阜蚌高速公路ECA-10的具体应用,论述了原材料技术要求、配合比设计、施工工艺和施工关键技术控制等.     

多相大功率永磁无刷直流电机控制器的研究

本文提出了一种采用晶闸管元件构成的多相大功率永磁无刷直流电动机控制器的新方案.着重分析了这种新型控制器的工作原理和可靠换流过程,介绍了多单元驱动器同步控制方法,提供了基于80C196KC单片机为核心的控制单元的结构图,论文最后给出了样机的试验结果.     

柴油质量对NOx和PM排放的影响及控制措施

控制柴油机排放的关键在于控制NOX和PM的排放,主要依赖于柴油品质的提高和后处理技术的发展。文中重点分析了柴油性质中硫、芳烃、十六烷值和馏程对NOX和PM排放的影响,探讨了当前用于控制NOX和PM的主要后处理技术。