全文获取类型
收费全文 | 564篇 |
免费 | 0篇 |
专业分类
公路运输 | 145篇 |
综合类 | 341篇 |
铁路运输 | 4篇 |
综合运输 | 74篇 |
出版年
2022年 | 1篇 |
2020年 | 4篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 27篇 |
2013年 | 28篇 |
2012年 | 48篇 |
2011年 | 35篇 |
2010年 | 19篇 |
2009年 | 49篇 |
2008年 | 81篇 |
2007年 | 82篇 |
2006年 | 81篇 |
2005年 | 24篇 |
2004年 | 12篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 14篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1989年 | 1篇 |
排序方式: 共有564条查询结果,搜索用时 0 毫秒
351.
352.
通过探讨影响路面抗滑性能的各项因素,分析路面摩擦系数随着各项因素的改变所发生的变化,研究了现有的抗滑性能测试方法,并对路面抗滑性能随影响因素的变化规律进行了分析。 相似文献
353.
应用有限元分析方法分析超载、水平荷载和路面坡度三个因素对下坡路段沥青路面层间剪应力的影响。分析结果显示三个因素对沥青路面结构层层底的剪应力都有不同程度的影响,其中车辆超载影响最为明显,水平力次之。当超载、水平力和坡度三个因素联合作用时,会使得破坏极为严重。因此为了有效地控制下坡路段沥青路面的滑移破坏,应当严格限制车辆的超载、纵坡的坡度和减少紧急制动。 相似文献
354.
影响沥青混凝土路面平整度的因素很多,结合现场的实际环境和条件,对施工各环节易出现的关键问题进行剖析,提出防范措施,规范施工行为,为路面平整度的质量控制提供参考。 相似文献
355.
This paper proposes a sensor location model to identify a sensor configuration that minimizes overall freeway performance monitoring errors while considering the consequences of probabilistic sensor failures. To date, existing sensor location models for freeway monitoring inherently assume that either deployed sensors never fail or the consequences of sensor failure are trivial matters. However, history has revealed that neither assumption is realistic, suggesting that ignoring failures in sensor allocation models may actually produce a significantly suboptimal configuration in the real world. Our work addresses this dilemma by developing a probabilistic optimization model that will minimize the error expectation by examining all possible failure scenarios, each with an occurrence probability. To ensure the scenario completeness and uniqueness, a sensor failure scenario is represented by using a binary string with 1 indicating an operational sensor at a given site and 0 for sensor failure or no sensor deployed. When applied to a case study network, it is shown that an optimal configuration that considers sensor failure is significantly different from an optimal configuration that ignores sensor failure, revealing that sensor failures pose non-trivial consequences on performance monitoring accuracy. 相似文献
356.
Mohamed Rehan Karim Nik Ibtishamiah Ibrahim Ahmad Abdullah Saifizul Hideo Yamanaka 《国际交通安全学会研究报告》2014
Vehicle overloading has been identified as one of the major contributors to road pavement damage in Malaysia. In this study, the weigh-in-motion (WIM) system has been used to function as a vehicle weight sorting tool to complement the exsiting static weigh bridge enforcement station. Data collected from the developed system is used to explore the effectiveness of using WIM system in terms of generating more accurate data for enforcement purposes and at the same time improving safety and reducing the number of vehicle weight violations on the roads. This study specifically focus on the effect of vehicle by-pass and static weigh station enforcement capability on the overall effectiveness of vehicle weight enforcement system in a developing country. Results from this study suggest that the WIM system will significantly enhance the effectiveness and efficiency of the current vehicle weight enforcement, thus generating substantial revenue that would greatly off-set the current road maintenance budget that comes from tax payers money. If there is substantial reduction in overloaded vehicles, the public will still gain through reduction in road maintenance budget, less accident risks involving heavy trucks, and lesser greenhouse gases (GHGs) emissions. 相似文献
357.
针对我国重型货车急剧上升的特点,公路建设中的高性能混凝土路面日益得到重视和应用.其中硅粉对提高HBSPC混凝土路面强度和耐久性具有优异的作用.为了比较不同硅粉对HBSPC性能的影响,选取了两种硅粉进行对比,就硅粉HBSPC的几项主要性能作了分析,以促进其广泛应用. 相似文献
358.
359.
360.