全文获取类型
收费全文 | 1023篇 |
免费 | 9篇 |
专业分类
公路运输 | 597篇 |
综合类 | 129篇 |
水路运输 | 87篇 |
铁路运输 | 168篇 |
综合运输 | 51篇 |
出版年
2022年 | 22篇 |
2021年 | 52篇 |
2020年 | 49篇 |
2019年 | 8篇 |
2018年 | 6篇 |
2017年 | 11篇 |
2016年 | 10篇 |
2015年 | 12篇 |
2014年 | 51篇 |
2013年 | 29篇 |
2012年 | 63篇 |
2011年 | 83篇 |
2010年 | 64篇 |
2009年 | 56篇 |
2008年 | 34篇 |
2007年 | 67篇 |
2006年 | 79篇 |
2005年 | 42篇 |
2004年 | 29篇 |
2003年 | 22篇 |
2002年 | 29篇 |
2001年 | 17篇 |
2000年 | 23篇 |
1999年 | 23篇 |
1998年 | 11篇 |
1997年 | 27篇 |
1996年 | 25篇 |
1995年 | 17篇 |
1994年 | 25篇 |
1993年 | 22篇 |
1992年 | 12篇 |
1991年 | 9篇 |
1990年 | 1篇 |
1988年 | 2篇 |
排序方式: 共有1032条查询结果,搜索用时 125 毫秒
41.
Understanding the patterns of automobile travel demand can help formulate policies to alleviate congestion and pollution. This study focuses on the influence of land use and household properties on automobile travel demand. Car license plate recognition (CLPR) data, point-of-interest (POI) data, and housing information data were utilized to obtain automobile travel demand along with the land use and household properties. A geographically and temporally weighted regression (GTWR) model was adopted to deal with both the spatial and temporal heterogeneity of travel demand. The spatial-temporal patterns of GTWR coefficients were analyzed. Also, comparative analyses were carried out between automobile and total person travel demand, and among travel demand of taxis, heavily-used private cars, and total automobiles. The results show that: (I) The GTWR model has significantly higher accuracy compared with the Ordinary Least Square (OLS) model and the Geographically Weighted Regression (GWR) model, which means the GTWR model can measure both the spatial and temporal heterogeneity with high precision; (II) The influence of built environment and household properties on automobile travel demand varies with space and time. In particular, the temporal distribution of regression coefficients shows significant peak phenomenon; and (III) Comparative analyses indicate that residents’ preference for automobiles over other travel modes varies with their travel purpose and destination. The above findings indicate that the proposed method can not only model spatial-temporal heterogeneous travel demand, but also provide a way to analyze the patterns of automobile travel demand. 相似文献
42.
Hossam Samir Ibrahim 《Coastal management》2015,43(5):539-554
Since 1990 there has been a considerable increase in the number of developing countries undertaking Integrated Coastal Zone Management (ICZM) schemes at both the local and national levels. Unfortunately many of these ICZM schemes have failed to be implementated due to difficulties such as information and communication gaps and restricted technical and financial capacity. Common problems experienced across all developing countries. As a case in point, it is argued that developing countries suffer from capabilities at the local institutional level. Similarly, it is advocated that Mediterranean developing countries have not fully implemented ICZM as a result of lack of stakeholder capacity. Egypt provides a case study of this argument. Since the mid-1990s several attempts have been made to promote ICZM in Egypt, however none have achieved their goal of having an ICZM plan become operational. This paper reviews ICZM processes in Egypt focussing on the capacity of all instituions and key stakeholders to plan and implement ICZM based on interviews with key ICZM key stakeholders as well as documentary analysis and participant observation in ICZM meetings. It seeks through a critical evaluation to provide practical recommendations that serve to enhance the implementation of ICZM in Egypt and other developing countries. 相似文献
43.
44.
高永强 《广东交通职业技术学院学报》2007,6(4):90-92
文中探讨和讲述了根据高职教育的教学特点和市场需求,以就业为导向开发汽车运用技术专业的专业课程。 相似文献
45.
伴随着生活水平的提升,人们对包括安全及舒适程度在内的汽车质量和性能等方面的要求得越来越高.激光焊接技术在汽车制造中的应用,能够有效提升焊接的精度以及质量,对汽车质量的提升有着重要的促进作用.本文首先对激光焊接技术的原理和优缺点进行简单介绍,然后介绍了几种激光焊接技术在汽车制造中的应用,旨在进一步促进对激光焊接技术的了解... 相似文献
46.
文章主要介绍基于UG二次开发的DTS名义值测量,本系统基于西门子的先进CAD设计平台NX之上开发的系统。以NX11和Visual Studio 2010作为运行和开发平台的,C、C++为开发语言,使用Block UI Styler为界面设计工具,NXOpen则提供了开发所需的应用程序包(API)。系统可以通过获取整车FVML(Finish Vehicle Measurement Location)文件包含的信息,通过用户选择文档中对应的零件特征,实现自动测量数模名义值及对应截面,并与FVML定义的数值进行对比。 相似文献
47.
48.
2020年,在新冠疫情全球持续蔓延的背景下,面对汽车销量近年的持续下滑,汽车厂家和经销商都积极地在互联网与新媒体上进行各种汽车营销活动。为了使职业院校汽车营销专业的课程内容与企业需求更为贴合,文章以抖音短视频平台中的汽车营销模式为例,探索汽车营销的课程改革,为职业院校汽车营销专业的师生提供借鉴。 相似文献
49.
50.