全文获取类型
收费全文 | 24695篇 |
免费 | 958篇 |
国内免费 | 33篇 |
专业分类
电工技术 | 329篇 |
综合类 | 38篇 |
化学工业 | 5655篇 |
金属工艺 | 380篇 |
机械仪表 | 476篇 |
建筑科学 | 1307篇 |
矿业工程 | 100篇 |
能源动力 | 621篇 |
轻工业 | 1888篇 |
水利工程 | 233篇 |
石油天然气 | 71篇 |
无线电 | 1818篇 |
一般工业技术 | 4503篇 |
冶金工业 | 4531篇 |
原子能技术 | 196篇 |
自动化技术 | 3540篇 |
出版年
2023年 | 214篇 |
2022年 | 359篇 |
2021年 | 567篇 |
2020年 | 338篇 |
2019年 | 431篇 |
2018年 | 535篇 |
2017年 | 463篇 |
2016年 | 632篇 |
2015年 | 558篇 |
2014年 | 749篇 |
2013年 | 1419篇 |
2012年 | 1161篇 |
2011年 | 1510篇 |
2010年 | 1075篇 |
2009年 | 1014篇 |
2008年 | 1147篇 |
2007年 | 1085篇 |
2006年 | 944篇 |
2005年 | 761篇 |
2004年 | 745篇 |
2003年 | 659篇 |
2002年 | 563篇 |
2001年 | 428篇 |
2000年 | 362篇 |
1999年 | 402篇 |
1998年 | 752篇 |
1997年 | 553篇 |
1996年 | 442篇 |
1995年 | 411篇 |
1994年 | 377篇 |
1993年 | 362篇 |
1992年 | 270篇 |
1991年 | 195篇 |
1990年 | 268篇 |
1989年 | 260篇 |
1988年 | 215篇 |
1987年 | 224篇 |
1986年 | 226篇 |
1985年 | 265篇 |
1984年 | 224篇 |
1983年 | 223篇 |
1982年 | 207篇 |
1981年 | 194篇 |
1980年 | 168篇 |
1979年 | 193篇 |
1978年 | 164篇 |
1977年 | 185篇 |
1976年 | 231篇 |
1975年 | 160篇 |
1974年 | 123篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
Kleinke Chris L.; Peterson Thomas R.; Rutledge Thomas R. 《Canadian Metallurgical Quarterly》1998,74(1):272
Two experiments were conducted in which participants looked at photographs (Experiment 1, n?=?129) or slides (Experiment 2, n?=?90) of people engaging in positive or negative facial expressions. Participants attempted to communicate these facial expressions as accurately as they could to a video camera while viewing themselves in a mirror or without viewing themselves in a mirror. Participants in a control group maintained neutral facial expressions. Participants experienced increased positive moods when they engaged in positive facial expressions and decreased positive moods when they engaged in negative facial expressions. These effects were enhanced when participants viewed themselves in a mirror. The effects of facial expressions on positive affect were stronger for participants with high private self-consciousness. Results were integrated with research identifying individuals who are responsive to self-produced versus situational cues and with theory and research on self-awareness. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
202.
Based on a rearrangement inequality by Hardy, Littlewood, and Polya, we define two-operator algebras for independent random variables. These algebras are called Huffman algebras since the Huffman algorithm on these algebras produces an optimal binary tree that minimizes the weighted lengths of leaves. Many examples of such algebras are given. For the case with random weights of the leaves, we prove the optimality of the tree constructed by the power-of-2 rule, i.e., the Huffman algorithm assuming identical weights, when the weights of the leaves are independent and identically distributed. 相似文献
203.
204.
205.
Thomas Emery 《Journal of population ageing》2012,5(1):7-22
The anticipated, dramatic shift in the demographics of European societies over the next half a century begs many questions about the state of relations between generations. Papers and speculations portraying a world in which the elderly rule through parliamentary majorities, preventing reductions in pensions and ??enslaving?? the working population are surprisingly common. Existing literature on these hypotheses focus on the policy preference differences between the young and the old with evidence mixed as to the accuracy of these predictions. This paper aims to build on this debate by looking at the effects that the dependency ratio has on intergenerational relations. By using a multilevel methodology and data from the 2008 European Social Survey, the effect of demographic structure can be observed on the individual level. Yet whilst evidence is found of decreasing legitimacy of welfare for the elderly, this paper argues that this does not point to increasing intergenerational conflict in Europe. 相似文献
206.
K. Srikrishna G. Thomas R. Martinez M. P. Corral S. De Aza J. S. Moya 《Journal of Materials Science》1990,25(1):607-612
The kaolinite-mullite reaction series in single crystal kaolinite has been characterized by transmission electron microscopy. The exotherm observed at 980° C is attributed to the formation of a spinel phase. Mullite crystallites have also been observed with the spinel phase and both phases have a composition near that of 32 mullite. Subsequent heat treatment leads to the growth of mullite crystallites on the original kaolinite plates with the c-axis perpendicular to the plate. 相似文献
207.
208.
Kalinnik Natalia Kiesel Robert Rauber Thomas Richter Marcel Rünger Gudula 《The Journal of supercomputing》2021,77(4):3484-3515
The Journal of Supercomputing - Scientific application codes are often long-running time- and energy-consuming parallel codes, and the tuning of these methods towards the characteristics of a... 相似文献
209.
Requirements Engineering - To reduce program risks, engineering methods capitalizing on modeling and machine assistance have been extensively investigated within systems engineering (and more... 相似文献
210.
Juan Pablo Hourcade Natasha E. Bullock-Rest Thomas E. Hansen 《Personal and Ubiquitous Computing》2012,16(2):157-168
In spite of great improvements in early diagnosis and interventions, most children diagnosed with autism spectrum disorders
(ASD) are unlikely to live independently when they reach adulthood. We have been conducting research on novel computer-based
interventions with the goal of promoting social skills. Working with 26 children with ASD, their teachers, and other stakeholders,
we have iteratively developed a set of activities based on applications that run on multitouch tablets. Our observations suggest
these activities increased pro-social behaviors such as collaboration and coordination, augmented appreciation for social
activities, and provided children with novel forms of expression. 相似文献