稳定粉土路面基层材料的力学特性研究

笔者在文中通过室内试验对水泥稳定粉土、石灰稳定粉土及固化剂稳定粉土的抗压强度、劈裂强度、弯拉强度、抗压回弹模量及弯拉回弹模量进行系统研究,得出强度和刚度增长规律,并在此基础上给出了各指标之间的线性回归方程,证明各指标之间存在良好的线性相关关系.     

一种系统特征参数虚拟测试方法

通过虚拟电子试验平台EWB,对一、二阶线性系统特征参数进行了虚拟测试,整个测试过程形象直观,具有可操作性和实时性.测试结果准确、可靠,达到了预期的效果.     

3项抓斗专利简介

分别介绍获得国家专利的异步启闭多颚板抓斗、扭矩撑推式抓斗和恒力剪式抓斗的结构、工作原理 和主要技术特点,并进行比较分析。     

空气弹簧及其在轨道车辆上的应用

空气弹簧以其特有的优势在轨道车辆中得到广泛的应用。文章介绍了空气弹簧的基本结构及其主要结构型式,对空气弹簧的特点和负荷特性进行了简要分析,并对空气弹簧在轨道车辆应用和发展情况作了详细介绍。     

粘液表皮样癌Ag-NORs计数与肥大细胞计数的关系

用Ag—NORs测定肿瘤的增生活性,用甲苯胺蓝染肿瘤间质MC,结果表明,粘液表皮样癌Ag—NORs计数值和MC计数值均高于正常涎腺组,且具统计学意义。在高、中、低不同分化程度的粘液表皮样癌中,随着肿瘤分化程度下降Ag—NORs计数值升高,MC计数值减少,而且高与低分化组之间有显著差异。这一结果提示Ag—NORs计数值可以做为粘液表皮样癌的诊断和生物学行为预报的客观指标之一,并说明在肿瘤发生发展过程中,做为肿瘤间质成份的MC与肿瘤细胞的增生活性之间存在着某种复杂的关系。     

Urban activity spaces: Illustrations and application of a conceptual model for integrating the time and space dimensions

This work extends the conceptual argument for the use of ellipses to portray activity spaces and offers one example of how the ellipse construct can be used to analyze urban travel characteristics, based on observed trip making behavior and socio-economic variables. A problem in characterizing activity spaces has been in integrating the time and space dimensions into the same analytical framework while maintaining an understandable graphical representation of the space-time geographies envisioned by Hagerstrand and others. The ellipse allows this, as well as providing several quantifiable measures to be used for analyzing and characterizing activity spaces and urban travel behavior. In the current application, analysis of variance is used to analyze the resulting elliptic variables of 653 travelers. The results indicate that home location and household size are important factors in determining activity space characteristics and that the ellipse variables provide a different and useful approach for understanding urban travel behavior.     

无缝线路流变问题初探

本文通过对无缝线路（简称ＣＷＲ）力学特性的介绍，引入了流变力学理论。系统地介绍了该理论同其它经典力学理论间的不同。详细论述了ＣＷＲ中存在着的流变现象，从而提出了ＣＷＲ理论研究必须将流变因素考虑进去的问题。     

路面铺装材料环道疲劳实验的动态实时测试与数据分析

在公路路面铺装材料环道疲劳实验上构筑了基于压电传感阵列的动态实时自动检测系统，获得了路面铺装材料在70万次连续碾压疲劳试验全过程的动态数据，探索了通过小波分析等数据分析方法，发现路面铺装材料疲劳，开裂，破坏等渐变过程的方法，其结果与人工肉眼判别的裂纹和损害情况基本吻合。     

A computerized household activity scheduling survey

Household activity scheduling is widely regarded as the underlying mechanism through which people respond to emerging travel demand management policies. Despite this, very little fundamental research has been conducted into the underlying scheduling process to improve our understanding and ability forecast travel. The experimental survey approach presented in this paper attempts to fill this gap. At the core of the survey is a Computerized Household Activity Scheduling (CHASE) software program. The program is unique in that it runs for a week long period during which time all adult household members login daily to record their scheduling decisions as they occur over time. An up-front interview is used to define a household's activity agenda and mode availability. A sample of 41 households (66 adults and 14 children) was used to assess the performance of the survey. Analysis focuses on times to completion, daily scheduling steps, activity-travel patterns, and scheduling time horizons. Overall, the results show that the computer-based survey design was successful in gathering an array of information on the underlying process, while minimizing the burden on respondents. The survey was also capable of tracing traditionally observed activity-travel outcomes over a multi-day period with minimal fatigue effects. The paper concludes with a detailed discussion on future survey design, including issues of instrument bias, use of the Internet, and improved tracing of spatial behaviour. Future use of the survey methodology to enhance activity-travel diary surveys and stated responses experiments is also discussed. This revised version was published online in June 2006 with corrections to the Cover Date.     

久效磷致死性效应的毒理学研究

本文采用放射性核素示综枝术研究了久效磷在小鼠体内含量分布与致死性效应的关系,相应观察了不同致死剂量久效磷对小鼠血和脑胆碱脂酶活性抑制程度的差异。实验表明:久效磷急性中毒致死与脑内毒物的含量有较密切的关系。同时发现LD_(50)剂量中毒存活的小鼠,血和脑内胆碱脂酶活性受抑制程度与同剂量及超致死剂量中毒死亡小鼠之间无显著性差异。本文对久效磷致死的毒理机制造行了初步探讨。