滑油污染度对车用柴油机台架磨合过程影响研究

利用油液检测技术中光谱分析、颗粒度分析和铁谱分析方法，研究了滑油污染度对CA6110Z-07Y型柴油机磨合过程的影响，光谱分析和颗粒粒度分析结果表明：1号机和3号机磨损性元素Fe，Cu，Al和Pb的含量在25～30min有一个明显下降量，说明柴油机润滑油完全经过滑油滤器的循环周期约为25min．由于3台机使用的是国产CD40润滑油，所有磨损性元素Fe，Cu，Al和Pb的含量在45min的磨合过程中均呈上升趋势，表明45min后仍未达到良好的磨合结果．同时，铁谱分析也证实了光谱分析和颗粒计数的结果．     

孕源断链在土地沙漠化防御技术中的实践剖析

基于灾害的链式理论对现今土地沙漠化问题进行了分析,指出土地沙漠化无论在成因上还是在危害性的表现结果上都呈现出复杂的链式效应,并依据灾害链式效应指出不合理耕作、开采地下水、砍伐树木、过度放牧及日益恶化的生态环境是形成土地沙漠化灾害链的源头因素.根据孕源断链的治灾思路,提出治理沙漠化应从其孕育初期的源头上控制灾害蔓延,切断灾害传播链,并从工程实践入手对其成效进行剖析。     

城市轨道车辆噪声控制的研究

本文在城市轨道车辆噪声、振动测量及数据分析的基础上,针对其噪声源和噪声传递途径,分析研究了各种减噪措施,为轻轨车辆设计和有轨电车改造提供了依据。     

基于GIS平台的农业非点源污染研究

开发了一种运算法自动生成AGNPS模型所需要的大部分资料，并把模拟结果转换成GIS文件格式，利用遥感软件和开发的程序，从3个来源生成AGNPS模型需要的数据，包括来自于地形地貌图的数字化文件，土壤调查图集的数字化土壤分类图和地球资源卫星TM图像的植被覆盖分类图件；一旦生成了需要的GIS文件，格式转换软件能把GIS文件转换为AGNPS要求的表格文件格式；最后把AGNPS所有输出结果转换成GIS文件格式，以便用于进一步工作分析。     

基于GPS精密单点定位的低轨卫星几何法定轨

为了提高几何法定轨的精度,系统分析了考虑低轨卫星受力情况的几何法定轨原理及数学模型,将动力学平滑结果作为几何法定轨的先验轨道,提出了一种改进的众数投票法,并将其成功地应用于低轨卫星几何法定轨,提高了基于非差观测值的数据预处理质量,避免了低轨卫星轨道出现较多的间隔,从而提高了定轨精度.     

汽车齿轮减速箱的故障诊断

用丹麦B&K2033A信号分析仪与IBM—PC微型计算机联接组成的强功能实时信号分析系统,对沈阳汽车齿轮厂生产的SQC6020A型金杯牌面包车齿轮减速箱进行了噪声、振动测试及信号分析,以查找出其噪声源,进行故障诊断,并在此基础上提出了减振降噪措施。     

一种前方车辆后轮接地点检测算法

现有车辆定位算法通常通过检测车辆底部阴影来定位车辆,该算法受阴影形状大小变化的影响较大,定位精度较低。该文提出了一种通过检测前方车辆后轮接地点来精确定位车辆的方法。首先通过垂直边缘和对称性测度实现路面车辆的初定位;然后利用车辆垂直边缘和后部水平边缘显著性的特点获得后车轮可能存在的感兴趣区(ROI);最后在该ROI中通过Tamura纹理特征的粗糙度对车轮和地面进行区分,精确地得到车轮接地点位置。     

制造企业物流外包决策的临界效应

分析了在制造企业的物流外包过程中存在的临界点和临界效应．在临界点前后，制造企业的经济效益急剧增加或减少，出现物流外包的临界效应．用系统论中的“白箱”模型描述物流外包决策的临界效应．投入要素包括物流外包总成本、制造企业所能提供的物流服务水平以及内部的物流管理能力．外包总成本按外包比例确定，服务水平分解为供应比率、按时配送能力和灵活性指数，内部物流管理能力用德尔菲法确定。产出要素指企业的整体经济效益．用系统分析的方法确定投入产出要素之间的相互作用，用邹氏检验法确定并验证临界点．     

Numerical research on wave-making resistance of trimaran

A 3D rankine panel method was developed for calculating the linear wave-making resistance of a tri-maran with Wigiey hulls. In order to calculate the normal vector and derivative of the body surface accurately,non-uniform rational B-spline (NURBS) was adopted to represent body surface and rankine source density.The radiation condition is satisfied using the numerical technology of staggered grids. Numerical results showthat the linear wave-making resistance of the trimaran can be calculated effectively using this method.     

The cumulative effect of nuisances from road transportation in residential sectors on the Island of Montreal – Identification of the most exposed groups and areas

Air pollution and road traffic noise are considered to be the two most important nuisances that could negatively affect the quality of life. A prolonged exposure to high concentrations of these pollutants could conduct to various health problems. Studies in environmental equity have often considered these nuisances individually whenever it comes from the same source. The main objective of this paper is to determine if the 15 years of age, those aged 65 and over, visible minorities and low income individuals located in a portion of the Island of Montreal are overrepresented in city blocks characterized by having among the highest levels of transportation-related air pollutants (i.e., ambient concentrations of NO₂ and road traffic noise in decibels (dB(A)). The results show that low-income individuals and, to a lesser extent, visible minorities, are significantly overrepresented in city blocks characterized by the higher levels of NO₂ and road traffic noise in dB(A). Multinomial logistic regression analysis confirms these results, and also shows that young people under 15 years are under-represented in the most polluted areas. However, contrary to the previous bivariate results, people aged 65 and over are negatively and significantly associated with the likelihood of their living in a city block located in an advantaged area after controlling for the independent effects of the other explanatory variables. Moreover, visible minorities are significantly overrepresented in advantaged areas. Considering the observed results, some solutions are identified to reduce road traffic noise and air pollution in the city blocks localized near major traffic arteries.