汽车点火综合性能测试台的共振分析及预防措施

汽车点火综合性能测试台是由机械部分和电器部分组成。机械部分的主体是转台，以转台的主轴模拟汽车和摩托车发动机的工作状况，通过机械动力学、两轴从而 三圆盘等效系统图的分析、精心的机械风言风语才加工装配措施，成功地解决了高速工作条件下可移动式机械转台的共振问题。     

机车瞬间故障检测诊断记录系统的设计与运用

故障诊断是保障列车安全可靠运行的技术基础之一。本文就采用机车瞬间故障检测记录系统对机车的瞬间故障定位和故障诊断的理论与实践进行了讨论，介绍了该系统的技术原理和软硬件设计中的几个典型问题，以及该系统在机车故障检测与定位中的作用及实际的运用情况。     

片麻岩区隧道施工炮后碴堆燃烧现象初析

合武铁路金寨隧道至长岭关隧道之间大部分为片岩及片麻岩区域,多座隧道在施工放炮后掌子面碴堆出现燃烧现象,严重威胁隧道施工安全。简述了燃烧掌子面的基本地质情况并提出了部分隧道炮后碴块吸附气体及拱顶气体采样分析结果,对片麻岩区隧道施工中炮后碴堆发生燃烧现象进行了初步分析。     

余姚东旱门过江隧道线路设计

具备机非混行通过能力的过江隧道,其平面、纵断面线型的设计合理性,直接影响该工程在建设阶段的造价,与使用阶段的社会效益。结合工程实际,介绍了过江隧道路线设计的有关经验,可供相关专业人员参考。     

Assessing the cost of transfer inconvenience in public transport systems: A case study of the London Underground

Few studies have adequately assessed the cost of transfers² in public transport systems, or provided useful guidance on transfer improvements, such as where to invest (which facility), how to invest (which aspect), and how much to invest (quantitative justification of the investment). This paper proposes a new method based on path choice,³ taking into account both the operator’s service supply and the customers’ subjective perceptions to assess transfer cost and to identify ways to reduce it. This method evaluates different transfer components (e.g., transfer walking, waiting, and penalty) with distinct policy solutions and differentiates between transfer stations and movements.The method is applied to one of the largest and most complex public transport systems in the world, the London Underground (LUL), with a focus on 17 major transfer stations and 303 transfer movements. This study confirms that transfers pose a significant cost to LUL, and that cost is distributed unevenly across stations and across platforms at a station. Transfer stations are perceived very differently by passengers in terms of their overall cost and composition. The case study suggests that a better understanding of transfer behavior and improvements to the transfer experience could significantly benefit public transport systems.     

探讨模拟数学在学术论文搞质量综合评价中的应用

首先提出,目前仍采用三审制,以语言设计院评价学术文稿质量,其结果模糊,缺乏量化、缺乏稿件之间的可比性,还受到评价人人为因素的影响,有失公正性,探讨应用模糊数学方法评价论文稿质量的可行性,介绍同属模糊数学范畴的方法一和方法二的运用过程,并将运用两方法的结果作比较,提出：方法二的基本内容是主因素决定型的数学模型M（∧,∨）,其运用结果仍显模糊,缺乏准确性;方法一简单,实用,结果直观,因为其运用过程中采用了以百分数表达的单因素评价矩阵与几项权重向量的合成运算,运用方法一,可促进编辑部审稿工作的程式化,标准化、自动化。     

兔心房室束及其束支的形态学和组织化学研究

用光镜和组化法研究了兔心房室束及其束支的形态学(20例)和胆碱酯酶活性(10例)。房室束长3.60mm,其中穿通部0.58mm,穿通前部3.02mm;多为三角形,扁圆形等。房室束的起始部由过渡细胞和起搏细胞组成,前部及其束支的细胞为长形,大小有异。右束支为条索状;左束支起始部较短,分支成片状。房室束的穿通部有很大差异,5例较典型,2例位于右侧心内膜和中心纤维体之间,其余不典型。房室束及其束支胆碱酯酶为强阳性,心肌为弱阳性。     

膨胀岩土地层盾构隧道结构力学行为研究

文章在提出膨胀接触压力概念的基础上,采用接触单元对膨胀接触压力和膨胀力的关系进行了研究,得出了膨胀接触压力与膨胀岩土分布、厚度、结构及地层刚度等的关系;同时对膨胀岩土地层中盾构隧道"荷载-结构"模式外荷载及"梁-弹簧"模型的特点进行了分析;并将其分析结果直接应用到成都地铁2号线膨胀岩土地层盾构隧道的结构分析中,得出了盾构隧道在不同膨胀岩土层、膨胀力、埋深和拼装方式条件下的结构内力值,对隧道结构设计起到了指导作用。     

排水沥青混合料比表面积的分形研究

对集料的粒径分布、级配、集料总体积、空隙率、表面积等做出相关分析,给定了集料各特征值的具体求法,建立体积分维DV和表面积分维DS之间的关系,并根据级配曲线的走向,按不同分段方式进行比表面积计算对比。结果表明:不同的分段方式对于排水沥青混合料的比表面积确定有很大的影响,在进行比表面积计算时,应按各筛级进行逐级分段计算。     

Dynamic demand estimation and microscopic traffic simulation of a university campus transportation network

Abstract

This article documents the authors' experience with the modeling, simulation, and analysis of a university transportation system, using the TRansportation ANalysis and SIMulation System (TRANSIMS). The processes of data preparation and network coding are described, followed by the algorithm developed to estimate the dynamic 24-hour demand, which includes a procedure for estimating the ‘desirability’ of the different parking lots from readily available data. The dynamic demand estimation algorithm is validated by comparing estimated and observed parking lot occupancies, where it is shown that the algorithm is capable of replicating observed results. Finally, an example is included to demonstrate how the developed model can be used in campus transportation planning. Besides serving as a first case study for using TRANSIMS to model a university campus, the study's contributions include the development of a procedure for parking lot desirability ranking and a practical procedure for estimating dynamic demand on university campuses.