全文获取类型
收费全文 | 20688篇 |
免费 | 1253篇 |
国内免费 | 156篇 |
专业分类
电工技术 | 408篇 |
综合类 | 78篇 |
化学工业 | 5020篇 |
金属工艺 | 496篇 |
机械仪表 | 662篇 |
建筑科学 | 745篇 |
矿业工程 | 28篇 |
能源动力 | 1420篇 |
轻工业 | 1969篇 |
水利工程 | 266篇 |
石油天然气 | 367篇 |
武器工业 | 8篇 |
无线电 | 2270篇 |
一般工业技术 | 3767篇 |
冶金工业 | 936篇 |
原子能技术 | 169篇 |
自动化技术 | 3488篇 |
出版年
2024年 | 85篇 |
2023年 | 430篇 |
2022年 | 948篇 |
2021年 | 1340篇 |
2020年 | 1086篇 |
2019年 | 1136篇 |
2018年 | 1352篇 |
2017年 | 1131篇 |
2016年 | 1152篇 |
2015年 | 694篇 |
2014年 | 1090篇 |
2013年 | 1919篇 |
2012年 | 1266篇 |
2011年 | 1368篇 |
2010年 | 931篇 |
2009年 | 825篇 |
2008年 | 637篇 |
2007年 | 557篇 |
2006年 | 467篇 |
2005年 | 338篇 |
2004年 | 293篇 |
2003年 | 248篇 |
2002年 | 233篇 |
2001年 | 151篇 |
2000年 | 155篇 |
1999年 | 156篇 |
1998年 | 256篇 |
1997年 | 220篇 |
1996年 | 166篇 |
1995年 | 144篇 |
1994年 | 99篇 |
1993年 | 107篇 |
1992年 | 84篇 |
1991年 | 61篇 |
1990年 | 68篇 |
1989年 | 73篇 |
1988年 | 68篇 |
1987年 | 50篇 |
1986年 | 58篇 |
1985年 | 67篇 |
1984年 | 75篇 |
1983年 | 65篇 |
1982年 | 46篇 |
1981年 | 40篇 |
1980年 | 47篇 |
1979年 | 39篇 |
1978年 | 36篇 |
1977年 | 39篇 |
1976年 | 53篇 |
1975年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Water Resources Management - This work presents an analytical solution for the linearized Boussinesq equation describing the nature of well hydraulics in equilateral triangular-shaped unconfined... 相似文献
3.
Output feedback controller for polytopic systems exploiting the direct searching of the design space
This paper deals with the problem of designing a robust static output feedback controller for polytopic systems. The current research that tackled this problem is mainly based on LMI method, which is conservative by nature. In this paper, a novel approach is proposed, which considers the design space of the controller parameters and iteratively partitions the space to small simplexes. Then, by assessing the stability in each simplex, the solution space for design parameters is directly determined. It has been theoretically proved that, if there exists a feasible solution in the design space, the algorithm can find it. To validate the result of the proposed approach, comparative simulation examples are given to illustrate the performance of the design methodology as compared to those of previous approaches. 相似文献
4.
5.
6.
7.
8.
9.
This paper considers the state‐dependent interference relay channel (SIRC) in which one of the two users may operate as a secondary user and the relay has a noncausal access to the signals from both users. For discrete memoryless SIRC, we first establish the achievable rate region by carefully merging Han‐Kobayashi rate splitting encoding technique, superposition encoding, and Gelfand‐Pinsker encoding technique. Then, based on the achievable rate region that we derive, the capacity of the SIRC is established in many different scenarios including (a) the weak interference regime, (b) the strong interference regime, and (c) the very strong interference regime. This means that our capacity results contain all available known results in the literature. Next, the achievable rate region and the associated capacity results are also evaluated in the case of additive Gaussian noise. Additionally, many numerical examples are investigated to show the value of our theoretical derivations. 相似文献
10.
Correction to: Cloud-based vehicular networks: a taxonomy,survey, and conceptual hybrid architecture
Jabbarpour Mohammad Reza Marefat Alireza Jalooli Ali Zarrabi Houman 《Wireless Networks》2019,25(2):913-913
Wireless Networks - The original version of this article unfortunately contained a mistake in the title. The correct title has been published with this erratum. 相似文献