数理统计法评标的报价策略

针对某地区采用的数理统计法评标的方式，分析总结出一套切实可行的报价策略。     

采用组合承力索线夹的支柱装配计算数学模型的优化设计

铁路电气化工程接触网专业上部安装作业能否一次到位,关键在于其数学模型建立得是否完善科学,特别是新的装配结构的出现,我们没有成熟的技术经验可以借鉴。本文以秦沈客运专线电气化工程为背景,详细介绍了采用组合承力索线夹的支柱装配计算数学模型的建立过程。     

提高自动化驼峰系统运用可靠性的探讨

近年来，自动化驼峰系统的控制功能和可靠性达到了较高的水平，科学合理地维护更成为提高系统运用可靠性的重要保证。现根据自动化驼峰设备的特点，总结出跟踪测试的几点有效做法。     

电子设备的电磁兼容性设计

EMC 是英文Electromagnetic Com-patibility (电磁兼容性)的缩写,指一个产品和其他产品共存于特定的电磁环境中,而不会引起其他产品性能下降或损坏的能力.电磁兼容主要包括2个方面的内容:一是发射性;二是抗扰性,即电磁骚扰性和电磁敏感性.     

海洋开发应上升为国家战略

南海,我们的南海 记者:资料显示,在南沙群岛中,中国控制着少数几个岛礁,而被越南、菲律宾、马来西亚、印度尼西亚和文莱所占的却达四十多个.据悉,2007年越南政府更是公开在南沙招标开采能源:文莱则靠南沙群岛的资源跻身于世界富国之列.     

贡噶雅鲁藏布江大桥简支转连续梁的设计与施工

连续梁体系荷载横向分布系数按等刚度原则变换为跨径相同的等截面简支梁，根据连续T梁的施工工序进行纵向受力分析、配置预应力钢束，利用简支梁的施工工艺，达到建造连续梁的目的，解决了简支T梁桥面连续构件容易损坏的弊端。     

Meeting an 80% reduction in greenhouse gas emissions from transportation by 2050: A case study in California

This paper investigates how California may reduce transportation greenhouse gas emissions 80% below 1990 levels by 2050 (i.e., 80in50). A Kaya framework that decomposes greenhouse gas emissions into the product of population, transport intensity, energy intensity, and carbon intensity is used to analyze emissions and mitigation options. Each transportation subsector, including light-duty, heavy-duty, aviation, rail, marine, agriculture, and off-road vehicles, is analyzed to identify specific mitigation options and understand its potential for reducing greenhouse gas emissions. Scenario analysis shows that, while California’s 2050 target is ambitious, it can be achieved in transport if a concerted effort is made to change travel behavior and the vehicles and fuels that provide mobility. While no individual ‘‘Silver Bullet” strategy exists that can achieve the goals, a portfolio approach that combines strategies could yield success. The 80in50 scenarios show the impacts of advanced vehicle and fuels technologies as well as the role of travel demand reduction, which can significantly reduce energy and resource requirements and the level of technology development needed to meet the target.     

Feasibility study for the application of air inflated membrane structure in China National Stadium

China National Stadium, also known as “Bird’s Nest”, is the main stadium of the 29th Olympic Games in Beijing in 2008, which has successfully held not only the Opening and the Closing ceremonies but also the track and field events. A new problem of rain preventing is brought out to improve the utilization of the Bird’s Nest after the Olympic Games. The scheme of installing an air inflated membrane at the opening of the steel structure is proposed in this paper to solve the rainproof problem of the Bird’s Nest. The form-finding and mechanical analyses of the air inflated membrane are carried out. Comparison between the mechanical performance and dynamical character before and after installing the air inflated membrane structure is given. To verify the analysis results, based on the practical structure of the Bird’s Nest, a test of a 1:20 model membrane is worked out.     

双块式轨枕长轨排调整支撑架设计及应用

就满足刚性支撑双块式轨枕无碴轨道长轨排且其铺设调整精度高的要求,设计双块式轨枕长轨排铺设专用施工机具即轨排调整支撑架。理论分析和工程试验说明,此调整支撑架能满足长轨排刚性支撑且铺设调整精度高的需要,可以作为铺设双块式或Rehda2000型轨枕长轨排的专用施工机具,具有造价低廉、结构简单、操作方便等优点。     

基于小滤变换和神经网络的汽车安全部件故障识别

汽车安全部件的工作状态直接影响汽四的安全行驶，运用小滤变换理论对汽四在不同部件参数作用下的运动参量进行小波分解。提取相关低频信号和车辆动万言书评批标作为汽四运动的牲值，结合神经网络技术进行了部分安全部件的故障状态识别。