全文获取类型
收费全文 | 14163篇 |
免费 | 595篇 |
专业分类
公路运输 | 4492篇 |
综合类 | 3967篇 |
水路运输 | 2996篇 |
铁路运输 | 2813篇 |
综合运输 | 490篇 |
出版年
2024年 | 37篇 |
2023年 | 86篇 |
2022年 | 233篇 |
2021年 | 374篇 |
2020年 | 365篇 |
2019年 | 225篇 |
2018年 | 195篇 |
2017年 | 257篇 |
2016年 | 249篇 |
2015年 | 395篇 |
2014年 | 972篇 |
2013年 | 710篇 |
2012年 | 1270篇 |
2011年 | 1268篇 |
2010年 | 1010篇 |
2009年 | 1000篇 |
2008年 | 975篇 |
2007年 | 1271篇 |
2006年 | 1175篇 |
2005年 | 790篇 |
2004年 | 456篇 |
2003年 | 348篇 |
2002年 | 239篇 |
2001年 | 223篇 |
2000年 | 140篇 |
1999年 | 102篇 |
1998年 | 76篇 |
1997年 | 65篇 |
1996年 | 40篇 |
1995年 | 30篇 |
1994年 | 37篇 |
1993年 | 43篇 |
1992年 | 23篇 |
1991年 | 17篇 |
1990年 | 21篇 |
1989年 | 25篇 |
1988年 | 13篇 |
1985年 | 1篇 |
1984年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
高速公路造价上涨的原因包括客观和主观两个方面,客观原因有高速公路建设标准及政策性取费标准的提高、原材料价格的上涨,主观原因有前期设计控制不严格、造价管理上存在不足。建议从强化设计管理、建立有效的审查模式、加强招投标管理、明确各有关部门的职责并强化职责落实四个方面进行高速公路造价控制。 相似文献
992.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):321-337
In this article, a new drivetrain configuration of a parallel hybrid electric vehicle is considered and a novel model-based control design strategy is given. In particular, the control design covers the speed synchronisation task during a restart of the internal combustion engine. The proposed multivariable synchronisation strategy is based on feedforward and decoupled feedback controllers. The performance and the robustness properties of the closed-loop system are illustrated by nonlinear simulation results. 相似文献
993.
994.
工业锅炉汽包水位的控制是一个大滞后非线性的控制问题,比较复杂。宜采用模糊控制。然
而,模糊矩阵的计算和解模糊都十分烦琐。本文使用面向工程和科学计算的交互式计算机软件MAT-
LAB的模糊推理系统工具箱,设计锅炉汽包水位控制系统,用SIMULINK模块对系统进行仿真,实现系
统的优化设计,有效地解决了模糊控制中的难题,大大提高了设计人员的工作效率。 相似文献
995.
This paper reports upon a survey of traffic noise annoyance in three residential districts of Trinidad, West Indies. Householder perceptions were solicited by means of a questionnaire survey and direct measurements of traffic noise levels were taken. The results were compared with surveys elsewhere. It was concluded that household status had little effect on annoyance perception, that at L10 levels greater than 70 dB(A) at a dwelling facade the noise level is unacceptable. L10 levels less than 65 dB(A) at the building facade are not perceived as annoying in the environment considered. 相似文献
996.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):429-448
This paper studies multi-objective control of a full-vehicle suspension excited by random road disturbances. The control problem is first formulated as a mixed ?2/?∞ synthesis problem and an output-feedback solution is obtained by using linear-matrix-inequalities. Next, the multi-objective control problem is re-formulated as a non-convex and non-smooth optimisation problem with controller order restricted to be less than the vehicle model order. For a range of orders, controllers are synthesised by using the HIFOO toolbox. The efficacy of the presented procedures are demonstrated by several design examples. 相似文献
997.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(2):243-264
The IMMa optimisation algorithm (IOA) consists of a heuristic method based on a differential evolution algorithm for choosing the Magic Formula (MF) tyre model parameters. In a previous paper, we demonstrated that the IOA improved the searching procedure of optimum MF parameters with respect to the starting value optimisation (SVO) methods. But we had to introduce some control input parameters that were fixed during the running process. Now, the new version does not require control input variables to be chosen by the user. That is, we use an algorithm with self-adapting control parameters and it continues being easy to use, robust and fast. Hence, users do not need any kind of knowledge to use the IOA. 相似文献
998.
介绍RFID技术及工作原理,并将其在列控系统中的应用方式进行描述,最后举例介绍了以RFID构成的点式列控系统. 相似文献
999.
该文以上海对口支援都江堰市西区自来水厂为对象,结合EPC合同模式特点,分析和总结了造价控制措施,为援建项目和水厂造价控制积累经验,达到有效地控制造价的目的。 相似文献
1000.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):587-601
Dynamic instability, that is, resonance, may occur on an electromagnetic suspension-type Maglev that runs over the elevated guideway, particularly at very low speeds, due to the flexibility of the guideway. An analysis of the dynamic interaction between the vehicle and guideway is required at the design stage to investigate such instability, setting slender guideway in design direction for reducing construction costs. In addition, it is essential to design an effective control algorithm to solve the problem of instability. In this article, a more detailed model for the dynamic interaction of vehicle/guideway is proposed. The proposed model incorporates a 3D full vehicle model based on virtual prototyping, flexible guideway by a modal superposition method and levitation electromagnets including feedback controller into an integrated model. By applying the proposed model to an urban Maglev vehicle newly developed for commercial application, an analysis of the instability phenomenon and an investigation of air gap control performance are carried out through a simulation. 相似文献