全文获取类型
收费全文 | 791篇 |
免费 | 5篇 |
专业分类
公路运输 | 317篇 |
综合类 | 91篇 |
水路运输 | 40篇 |
铁路运输 | 160篇 |
综合运输 | 188篇 |
出版年
2022年 | 15篇 |
2021年 | 32篇 |
2020年 | 60篇 |
2019年 | 14篇 |
2018年 | 42篇 |
2017年 | 26篇 |
2016年 | 39篇 |
2015年 | 45篇 |
2014年 | 53篇 |
2013年 | 21篇 |
2012年 | 46篇 |
2011年 | 55篇 |
2010年 | 33篇 |
2009年 | 33篇 |
2008年 | 25篇 |
2007年 | 44篇 |
2006年 | 43篇 |
2005年 | 39篇 |
2004年 | 29篇 |
2003年 | 31篇 |
2002年 | 10篇 |
2001年 | 11篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 9篇 |
1992年 | 1篇 |
1991年 | 9篇 |
1990年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有796条查询结果,搜索用时 46 毫秒
91.
电力机车用110V大功率高频开关电源电磁兼容性 总被引:3,自引:0,他引:3
针对新开发的全桥型电力机车用110V高频开关控制电源,建立IGBT的模型,用以模拟开关过程中所用IGBT反向恢复过程。通过建立各无源元件的高频模型,提取出其寄生参数。在Saber仿真环境中建立传导噪声仿真模型,解决电磁干扰问题。通过在Candence软件中重新提取连接导线的寄生参数进行仿真,得到修改布线后的传导噪声水平。分析认为在较低频段时,差模传导噪声占主导地位;利用滤波、屏蔽等方法和手段能够达到抑制电磁干扰的目的。 相似文献
92.
本文提出了对车辆联挂系统的振动分析方法,说明了生成振动系统的广义质量阵和广义刚度阵的过程,以及振动微分方程的求解方法.在此基础上编制了振动分析程序,可计算出多自由度振动系统的各阶自振频率及对应的振型. 相似文献
93.
94.
通过对我国电力牵引达22年区段的27.5kV工频电场强度为1.75-3.46kV/m,磁感应强度为0.60-1.75mT,人体感应电流为10.08-58.40μA环境下作业的1359名工人和无电磁场接触史的375名工人的视-运动反应时值进行的测验和分析。结果表明两组无明显差异。引起视-运动反应时值的延长。结果表明两组无明显差异,引起视-运动反应时值的延长,机体协调功能减退的主要原因是年龄因素的增长 相似文献
95.
为了提高使用岸电的场桥(ERTG)的工作效率,研制了ERTG的能量回收系统和全电动转场系统。论述了能量回收节能及全电动转过场系统的原理、工况及操作规程。该系统取消了柴油发电机组,转过场时实现无间断电源及全电动操作,同时该系统能够吸收部分势能,起到节能作用,实现了ERTG全电动作业及真正的零排放。 相似文献
96.
本文详细阐述了鉴定二手汽车的步骤及方法,并说明如何鉴别事故车辆。列明了在评估二手车时影响车辆评估价格的各种因素,针对市场中各类车辆分别采用的不同评估方法。 相似文献
97.
98.
99.
Maarten Messagie Nele Sergeant Surendraprabu Rangaraju Javier San Felix Forner Luis Oliveira Thierry Coosemans 《运输规划与技术》2015,38(3):335-346
The European Clean Vehicle Directive was introduced in 2009 to create an obligation on public authorities to take into account the impact of energy consumption, carbon dioxide (CO2) emissions and pollutant emissions into their purchasing decisions for road transport vehicles. This should stimulate the market for clean and energy-efficient vehicles and improve transport's impact on environment, climate change and energy use. Therefore the so-called ‘Operational Lifetime Cost’ of a vehicle is calculated, divided into the cost for energy consumption, CO2 and pollutant (nitrous oxide, particulate matter, non-methane hydrocarbons) emissions. In Belgium, a different methodology has been developed to calculate the environmental impact of a vehicle, called ‘Ecoscore’, based on a well-to-wheel approach. More pollutants are included compared to the Clean Vehicle methodology, but also indirect emissions are taken into account. In this paper, both methodologies are compared and used to analyze the environmental performance of passenger cars with different fuel types and from different vehicle segments. Similar rankings between both methodologies are obtained; however, the large impact of energy use (and CO2 emissions) in the Clean Vehicle methodology disadvantages compressed natural gas cars, as well as diesel cars equipped with particulate filters, compared to the Ecoscore methodology. 相似文献
100.
The majority of previous studies examining life cycle greenhouse gas (LCGHG) emissions of battery electric vehicles (BEVs) have focused on efficiency-oriented vehicle designs with limited battery capacities. However, two dominant trends in the US BEV market make these studies increasingly obsolete: sales show significant increases in battery capacity and attendant range and are increasingly dominated by large luxury or high-performance vehicles. In addition, an era of new use and ownership models may mean significant changes to vehicle utilization, and the carbon intensity of electricity is expected to decrease. Thus, the question is whether these trends significantly alter our expectations of future BEV LCGHG emissions.To answer this question, three archetypal vehicle designs for the year 2025 along with scenarios for increased range and different use models are simulated in an LCGHG model: an efficiency-oriented compact vehicle; a high performance luxury sedan; and a luxury sport utility vehicle. While production emissions are less than 10% of LCGHG emissions for today’s gasoline vehicles, they account for about 40% for a BEV, and as much as two-thirds of a future BEV operated on a primarily renewable grid. Larger battery systems and low utilization do not outweigh expected reductions in emissions from electricity used for vehicle charging. These trends could be exacerbated by increasing BEV market shares for larger vehicles. However, larger battery systems could reduce per-mile emissions of BEVs in high mileage applications, like on-demand ride sharing or shared vehicle fleets, meaning that trends in use patterns may countervail those in BEV design. 相似文献