全文获取类型
收费全文 | 18469篇 |
免费 | 2192篇 |
国内免费 | 13篇 |
专业分类
电工技术 | 689篇 |
综合类 | 681篇 |
化学工业 | 8995篇 |
金属工艺 | 337篇 |
机械仪表 | 225篇 |
建筑科学 | 933篇 |
矿业工程 | 55篇 |
能源动力 | 304篇 |
轻工业 | 1228篇 |
水利工程 | 106篇 |
石油天然气 | 47篇 |
武器工业 | 2篇 |
无线电 | 712篇 |
一般工业技术 | 3057篇 |
冶金工业 | 592篇 |
原子能技术 | 64篇 |
自动化技术 | 2647篇 |
出版年
2023年 | 615篇 |
2022年 | 473篇 |
2021年 | 876篇 |
2020年 | 755篇 |
2019年 | 652篇 |
2018年 | 708篇 |
2017年 | 536篇 |
2016年 | 776篇 |
2015年 | 787篇 |
2014年 | 919篇 |
2013年 | 1376篇 |
2012年 | 843篇 |
2011年 | 866篇 |
2010年 | 1006篇 |
2009年 | 1151篇 |
2008年 | 688篇 |
2007年 | 607篇 |
2006年 | 456篇 |
2005年 | 428篇 |
2004年 | 459篇 |
2003年 | 402篇 |
2002年 | 368篇 |
2001年 | 217篇 |
2000年 | 159篇 |
1999年 | 175篇 |
1998年 | 195篇 |
1997年 | 173篇 |
1996年 | 164篇 |
1995年 | 169篇 |
1994年 | 145篇 |
1993年 | 213篇 |
1992年 | 143篇 |
1991年 | 133篇 |
1990年 | 149篇 |
1989年 | 159篇 |
1988年 | 120篇 |
1987年 | 139篇 |
1986年 | 153篇 |
1985年 | 138篇 |
1984年 | 144篇 |
1983年 | 150篇 |
1982年 | 113篇 |
1981年 | 142篇 |
1980年 | 122篇 |
1979年 | 98篇 |
1977年 | 97篇 |
1976年 | 89篇 |
1975年 | 104篇 |
1974年 | 98篇 |
1973年 | 168篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
Jan Eichelberger 《Datenschutz und Datensicherheit - DuD》2006,30(8):490-496
Zusammenfassung Aus der Sicht eines informationstechnischen Laien scheinen Denial of Service-Angriffe mit Online-Demonstrationen in keinem
Zusammenhang zu stehen. Das Gegenteil ist der Fall, wenn durch derartige Angriffe der Anbieter einer Webseite buchst?blich
lahm gelegt wird. Ob die an sich lautere Intention einer kritischen Meinungs?u?erung derartige Angriffe rechtfertigen kann,
ist fraglich und besch?ftigt die Justiz. Der Verfasser dieses Beitrages bewertet den Sachverhalt eines Denial-of-Service-Angriffes
strafrechtlich.
Dr. jur. Jan Eichelberger, LL.M.oec.
Rechtsreferendar am Kammergericht Interessenschwerpunkte im Gewerblichen Rechtsschutz, im Kapitalmarktrecht und im Recht der
neuen Medien 相似文献
35.
The digital multistep method generates uniform pseudorandom numbers by transforming sequences of integers obtained by multistep recursions. The statistical independence properties of these pseudorandom numbers depend on the characteristic polynomial of the recursion. We describe a method of calculating characteristic polynomials that are optimal with respect to statistical independence of pairs of successive pseudorandom numbers. Tables of such optimal characteristic polynomials for degrees ≤64 are included. 相似文献
36.
Filip Sroubek Gabriel Cristóbal Jan Flusser 《IEEE transactions on image processing》2007,16(9):2322-2332
This paper presents a new approach to the blind deconvolution and superresolution problem of multiple degraded low-resolution frames of the original scene. We do not assume any prior information about the shape of degradation blurs. The proposed approach consists of building a regularized energy function and minimizing it with respect to the original image and blurs, where regularization is carried out in both the image and blur domains. The image regularization based on variational principles maintains stable performance under severe noise corruption. The blur regularization guarantees consistency of the solution by exploiting differences among the acquired low-resolution images. Several experiments on synthetic and real data illustrate the robustness and utilization of the proposed technique in real applications. 相似文献
37.
38.
39.
The authors used visual search tasks in which components of the classic flanker task (B. A. Eriksen & C. W. Eriksen, 1974) were introduced. In several experiments the authors obtained evidence of parallel search for a target among distractor elements. Therefore, 2-stage models of visual search predict no effect of the identity of those distractors. However, clear compatibility effects of the distractors were obtained: Responses were faster when the distractors were compatible with the response than when they were incompatible. These results show that even in parallel search tasks identity information is extracted from the distractors. In addition, alternative interpretations of the results in terms of the occasional identification of a distractor before or after the target was identified could be ruled out. The results showed that flat search slopes obtained in visual search experiments provide no benchmark for preattentive processing. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
40.
Jan Buijs 《Creativity & Innovation Management》2007,16(2):203-210
Innovating is a multi‐faceted process. In this paper, four different, yet intertwined aspects of this process are distinguished. The first aspect concerns the content of the innovation; a new product, a new technology or a new market. The second aspect concerns the group dynamics of the innovation team. The third aspect concerns seeing the innovation process as a creative process. And the fourth aspect has to do with leadership. Since these four aspects are simultaneously working together during the innovation process, the leaders of this process are working in a very difficult situation, as all four aspects need to be dealt with in different ways. Nearly all of them are, in one way or another, in conflict with one another. They may conflict in real actions, in time horizons (past, present or future) or in effect (positive reactions during market introduction do not garantee ultimate market success). This means that innovation leaders need to show a special kind of leadership. This leadership must be balanced, people‐focused and must include a high tolerance for ambiguity and paradoxes. They have to be nice and nasty at the same time. In short: innovation leaders should be some kind of controlled schizophrenics. 相似文献