全文获取类型
收费全文 | 7628篇 |
免费 | 410篇 |
国内免费 | 14篇 |
专业分类
电工技术 | 83篇 |
综合类 | 2篇 |
化学工业 | 1873篇 |
金属工艺 | 177篇 |
机械仪表 | 145篇 |
建筑科学 | 283篇 |
矿业工程 | 15篇 |
能源动力 | 246篇 |
轻工业 | 705篇 |
水利工程 | 76篇 |
石油天然气 | 28篇 |
武器工业 | 6篇 |
无线电 | 558篇 |
一般工业技术 | 1601篇 |
冶金工业 | 838篇 |
原子能技术 | 43篇 |
自动化技术 | 1373篇 |
出版年
2023年 | 56篇 |
2022年 | 119篇 |
2021年 | 168篇 |
2020年 | 160篇 |
2019年 | 134篇 |
2018年 | 179篇 |
2017年 | 197篇 |
2016年 | 253篇 |
2015年 | 170篇 |
2014年 | 271篇 |
2013年 | 604篇 |
2012年 | 451篇 |
2011年 | 545篇 |
2010年 | 369篇 |
2009年 | 373篇 |
2008年 | 505篇 |
2007年 | 430篇 |
2006年 | 371篇 |
2005年 | 305篇 |
2004年 | 281篇 |
2003年 | 241篇 |
2002年 | 202篇 |
2001年 | 123篇 |
2000年 | 103篇 |
1999年 | 114篇 |
1998年 | 118篇 |
1997年 | 103篇 |
1996年 | 102篇 |
1995年 | 93篇 |
1994年 | 109篇 |
1993年 | 78篇 |
1992年 | 63篇 |
1991年 | 52篇 |
1990年 | 46篇 |
1989年 | 64篇 |
1988年 | 47篇 |
1987年 | 25篇 |
1986年 | 31篇 |
1985年 | 40篇 |
1984年 | 40篇 |
1983年 | 26篇 |
1982年 | 26篇 |
1981年 | 42篇 |
1980年 | 24篇 |
1979年 | 22篇 |
1978年 | 25篇 |
1977年 | 15篇 |
1976年 | 12篇 |
1974年 | 22篇 |
1973年 | 14篇 |
排序方式: 共有8052条查询结果,搜索用时 0 毫秒
81.
Ortega-Cabezas Pedro Miguel Colmenar-Santos Antonio Borge-Diez David Blanes-Peiró Jorge Juan Higuera-Pérez Jorge Alcaide Eric 《Software Quality Journal》2022,30(3):687-728
Software Quality Journal - The number of electronic control units (ECU) installed in vehicles is increasingly high. Manufacturers must improve the software quality and reduce cost by proposing... 相似文献
82.
Optimized Photoinitiator for Fast Two‐Photon Absorption Polymerization of Polyester‐Macromers for Tissue Engineering 下载免费PDF全文
83.
Manipulating Electrical and Fluidic Access in Integrated Nanopore‐Microfluidic Arrays Using Microvalves 下载免费PDF全文
84.
85.
86.
87.
88.
89.
In recent work, Kalai, Klivans, Mansour, and Servedio (2005) studied a variant of the “Low-Degree (Fourier) Algorithm” for learning under the uniform probability distribution on {0,1} n . They showed that the L 1 polynomial regression algorithm yields agnostic (tolerant to arbitrary noise) learning algorithms with respect to the class of threshold functions—under certain restricted instance distributions, including uniform on {0,1} n and Gaussian on ? n . In this work we show how all learning results based on the Low-Degree Algorithm can be generalized to give almost identical agnostic guarantees under arbitrary product distributions on instance spaces X 1×???×X n . We also extend these results to learning under mixtures of product distributions. The main technical innovation is the use of (Hoeffding) orthogonal decomposition and the extension of the “noise sensitivity method” to arbitrary product spaces. In particular, we give a very simple proof that threshold functions over arbitrary product spaces have δ-noise sensitivity $O(\sqrt{\delta})$ , resolving an open problem suggested by Peres (2004). 相似文献
90.
As a foundation for action selection and task-sequencing intelligence, the reactive and deliberative subsystems of a hybrid agent can be unified by a single, shared representation of intention. In this paper, we summarize a framework for hybrid dynamical cognitive agents (HDCAs) that incorporates a representation of dynamical intention into both reactive and deliberative structures of a hybrid dynamical system model, and we present methods for learning in these intention-guided agents. The HDCA framework is based on ideas from spreading activation models and belief–desire–intention (BDI) models. Intentions and other cognitive elements are represented as interconnected, continuously varying quantities, employed by both reactive and deliberative processes. HDCA learning methods—such as Hebbian strengthening of links between co-active elements, and belief–intention learning of task-specific relationships—modify interconnections among cognitive elements, extending the benefits of reactive intelligence by enhancing high-level task sequencing without additional reliance on or modification of deliberation. We also present demonstrations of simulated robots that learned geographic and domain-specific task relationships in an office environment. 相似文献