人绒毛膜ABO(H)血型物质检测的研究

本文以人绒毛膜为检材,提出玻片粘附解离法检测ABO(H)血型物质。同时对绒毛膜的取材条件及保存方法进行了初步的探索。结果表明:本实验方法与目前国内报道的人绒毛膜ABO(H)血型物质试管检测的方法相比较,取材用量少(2～4 mg),操作简便,对孕早期进行亲子鉴定有实用意义。检材在冷藏保存情况下,检测时限可达三个月。     

Alternative Modeling Approaches Used for Examining Automobile Ownership: A Comprehensive Review

Abstract

Household vehicle ownership, and the associated dimensions including fleet size, vehicle type and usage, has been one of the most researched transport topics. This paper endeavors to provide a critical overview of the wide-ranging methodological approaches employed in vehicle ownership modeling depending on the ownership representation over the past two decades. The studies in the existing literature based on the vehicle ownership representation are classified as: exogenous static, exogenous dynamic, endogenous static and endogenous dynamic models. The methodological approaches applied range from simple linear regressions to complex econometrics formulations taking into account a rich set of covariates. In spite of the steady advancement and impressive evolution in terms of methodological approaches to examine the decision process, we identify complex issues that pose a formidable challenge to address the evolution of vehicle ownership in the coming years. Specifically, we discuss challenges with data availability and methodological framework selection. In light of these discussions, we provide a decision matrix for aiding researchers/practitioners in determining appropriate model frameworks for conducting vehicle ownership analysis.     

重庆轨道交通3号线检修通道研制

高架跨座式单轨交通的结构特点使得其运营中的检查维修工作难以展开、紧急事故应对能力差，研究设计专门的检修通道迫在眉睫。文章简要介绍重庆轨道交通3号线检修通道的功能、构成、总体设计要求、重点制作工艺，为今后跨座式单轨检修通道的制作提供依据和参考。     

A substitute model of two-dimensional dry friction exposed to dither generated by rolling contact of wheel and rail

Dither generated by rolling contact of wheel and rail smoothes dry friction damping provided by the primary suspension dampers of freight wagons and it should be taken into account in numerical simulations. But numerically the problem is non-smooth and this leads to long execution time during simulation, especially when the vehicle with friction dampers is modelled in the environment of an multi-body system simulation program, whose solver has to cope with many strong non-linearities. The other difficulty is the necessity of handling within the code a number of big volume files of recorded dither sampled with high frequency. To avoid these difficulties, a substitute model of two-dimensional dry friction exposed to dither is proposed that does not need application of dither during simulation, but it behaves as if dither were applied. Due to this property of the model, the excitation of the vehicle model by track irregularities may be supplied as low-frequency input, which allows fast execution and, the necessity of handling high-volume files of recorded dither is avoided. The substitute model is numerically effective. To identify parameters of the substitute model, a pre-processing employing a sample of the realistic dither is carried-out on a simple two-degrees-of-freedom system. The substitute model is anisotropic, describing anisotropic properties of the two-dimensional friction arising in the presence of one-dimensional dither. The model may be applied in other branches of engineering, for example, in mechatronics and robotics, where application of dither may improve the accuracy of positioning devices.     

高速铁路双块式无砟轨道路基地段结构设计与施工技术研究

为了提高双块式无砟轨道的设计和施工质量,首先对路基地段双块式无砟轨道道床板和支承层的功能定位进行分析,提出连续道床板和分块道床板两种结构设计方案的主要特点和设计要点,并对两种设计方案进行结构受力和配筋计算。然后从抗压强度、结构耐久性、疲劳强度、裂缝控制等要求研究道床板混凝土的强度等级,提出道床板混凝土强度采用C40是足够的,且强度不宜太高。最后结合目前双块式无砟轨道施工和运营经验,提出道床板和支承层在施工过程中应注意的一些问题。     

适应大型船舶靠离码头的全回转拖轮的研制

为使大型集装箱船舶安全快速地靠离码头,本课题开发研制了3676kW(5000马力)新型全回转拖轮.通过对总体布置和线型的优化设计,合理地选配设备和新工艺的应用,使新型拖轮能安全地进入大型集装箱船舶的艏部和艉部区域,有效地实施顶推作业,提高了作业效率和安全系数,具有显著的经济效益和社会效益.实船已投入使用。     

展线型立交形式初探

展线型立交是山区道路中的特种立交。研究展线型立交的基本特征，探讨其4种基本形式，供同行参考。     

西安市南北中轴线改造工程设计思考

该文通过西安市南北中轴线改造过程中对横断面型式的确定、旧路材料的再生利用、公交停靠站的设计等技术问题的探索和尝试,提出了解决的方法和见解,同时介绍了旧路改造设计中得到的启示。     

大型耙吸挖泥船“新海虎”号的轮机设计

文章描述了“新海虎”耙吸挖泥船轮机系统的设计，包括采用复合驱动的动力系统、功率管理系统、热源系统、冷却系统和泥泵封水系统的设计。     

刚架系杆拱桥钢-混凝土接头传力行为研究

对于钢—混凝土组合结构而言,其两者的有效结合和共同受力是关键。以某座刚架系杆拱桥钢—混凝土接头为对象进行了研究,作为整个桥梁的关键构造,其计算理论是否符合实际及合理显得尤为重要。文章采用解析的方法,考虑了基于三角形反力分布和矩形反力分布两种埋入式接头模式,并在矩形反力分布模式中考虑了钢—混凝土粘结力的影响。将两种计算模式的结果及是否考虑钢—混凝土粘结力计算的结果进行了比较。结果表明：具有类似工程背景的混合拱桥钢—混凝土接头可以采用设结合段的埋入式接头理论进行设计与分析,是否考虑钢—混凝土粘结力对计算结果有较大的影响。