全文获取类型
收费全文 | 244254篇 |
免费 | 2801篇 |
国内免费 | 442篇 |
专业分类
电工技术 | 4324篇 |
综合类 | 267篇 |
化学工业 | 40350篇 |
金属工艺 | 9432篇 |
机械仪表 | 7453篇 |
建筑科学 | 5501篇 |
矿业工程 | 1402篇 |
能源动力 | 5297篇 |
轻工业 | 24959篇 |
水利工程 | 2492篇 |
石油天然气 | 5104篇 |
武器工业 | 33篇 |
无线电 | 25326篇 |
一般工业技术 | 45527篇 |
冶金工业 | 45472篇 |
原子能技术 | 5998篇 |
自动化技术 | 18560篇 |
出版年
2021年 | 2263篇 |
2019年 | 2091篇 |
2018年 | 3582篇 |
2017年 | 3519篇 |
2016年 | 3803篇 |
2015年 | 2326篇 |
2014年 | 4061篇 |
2013年 | 10429篇 |
2012年 | 6323篇 |
2011年 | 8522篇 |
2010年 | 6704篇 |
2009年 | 7378篇 |
2008年 | 7751篇 |
2007年 | 7838篇 |
2006年 | 6982篇 |
2005年 | 6139篇 |
2004年 | 5898篇 |
2003年 | 5682篇 |
2002年 | 5769篇 |
2001年 | 5617篇 |
2000年 | 5428篇 |
1999年 | 5342篇 |
1998年 | 12595篇 |
1997年 | 8926篇 |
1996年 | 6884篇 |
1995年 | 5352篇 |
1994年 | 4758篇 |
1993年 | 4642篇 |
1992年 | 3689篇 |
1991年 | 3396篇 |
1990年 | 3613篇 |
1989年 | 3482篇 |
1988年 | 3307篇 |
1987年 | 2904篇 |
1986年 | 2937篇 |
1985年 | 3380篇 |
1984年 | 3233篇 |
1983年 | 2900篇 |
1982年 | 2744篇 |
1981年 | 2827篇 |
1980年 | 2723篇 |
1979年 | 2628篇 |
1978年 | 2688篇 |
1977年 | 2950篇 |
1976年 | 3809篇 |
1975年 | 2371篇 |
1974年 | 2245篇 |
1973年 | 2379篇 |
1972年 | 1974篇 |
1971年 | 1862篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
We consider the design problem for a class of discrete-time and continuous-time neural networks. We obtain a characterization of all connection weights that store a given set of vectors into the network, that is, each given vector becomes an equilibrium point of the network. We also give sufficient conditions that guarantee the asymptotic stability of these equilibrium points. 相似文献
92.
Nonlinear adaptive filters based on a variety of neural network models have been used successfully for system identification and noise-cancellation in a wide class of applications. An important problem in data communications is that of channel equalization, i.e., the removal of interferences introduced by linear or nonlinear message corrupting mechanisms, so that the originally transmitted symbols can be recovered correctly at the receiver. In this paper we introduce an adaptive recurrent neural network (RNN) based equalizer whose small size and high performance makes it suitable for high-speed channel equalization. We propose RNN based structures for both trained adaptation and blind equalization, and we evaluate their performance via extensive simulations for a variety of signal modulations and communication channel models. It is shown that the RNN equalizers have comparable performance with traditional linear filter based equalizers when the channel interferences are relatively mild, and that they outperform them by several orders of magnitude when either the channel's transfer function has spectral nulls or severe nonlinear distortion is present. In addition, the small-size RNN equalizers, being essentially generalized IIR filters, are shown to outperform multilayer perceptron equalizers of larger computational complexity in linear and nonlinear channel equalization cases. 相似文献
93.
94.
Effective systems development techniques attract a lot of attention, but little has been done to effectively address systems maintenance. This article describes an effective, proven approach to resurrecting existing systems and Increasing their useful life, using a system that employs both software tools and a rigorous methodology. 相似文献
95.
96.
97.
This research was supported under project No. 6.02.02/128-93 as part of the state scientific-technical program on future information
technologies and systems by the Ukrainian State Committee, of Science and Technology. 相似文献
98.
99.
100.
In the editorial by J.C. Bezdek (ibid., p.1), an example is presented to demonstrate differences between fuzzy membership and probability. The authors argue that probability can be used in a way much more closely analogous to this use of fuzzy membership, weakening the argument for the latter 相似文献