全文获取类型
收费全文 | 1808篇 |
免费 | 101篇 |
国内免费 | 70篇 |
专业分类
电工技术 | 47篇 |
综合类 | 280篇 |
化学工业 | 91篇 |
金属工艺 | 26篇 |
机械仪表 | 57篇 |
建筑科学 | 96篇 |
矿业工程 | 34篇 |
能源动力 | 9篇 |
轻工业 | 51篇 |
水利工程 | 11篇 |
石油天然气 | 4篇 |
武器工业 | 15篇 |
无线电 | 221篇 |
一般工业技术 | 197篇 |
冶金工业 | 253篇 |
原子能技术 | 4篇 |
自动化技术 | 583篇 |
出版年
2024年 | 8篇 |
2023年 | 9篇 |
2022年 | 23篇 |
2021年 | 20篇 |
2020年 | 40篇 |
2019年 | 21篇 |
2018年 | 25篇 |
2017年 | 31篇 |
2016年 | 23篇 |
2015年 | 34篇 |
2014年 | 58篇 |
2013年 | 73篇 |
2012年 | 89篇 |
2011年 | 111篇 |
2010年 | 97篇 |
2009年 | 113篇 |
2008年 | 107篇 |
2007年 | 145篇 |
2006年 | 130篇 |
2005年 | 119篇 |
2004年 | 100篇 |
2003年 | 95篇 |
2002年 | 73篇 |
2001年 | 69篇 |
2000年 | 44篇 |
1999年 | 34篇 |
1998年 | 42篇 |
1997年 | 29篇 |
1996年 | 31篇 |
1995年 | 23篇 |
1994年 | 16篇 |
1993年 | 17篇 |
1992年 | 15篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1977年 | 3篇 |
1965年 | 2篇 |
1963年 | 2篇 |
1961年 | 4篇 |
1958年 | 2篇 |
1955年 | 8篇 |
1954年 | 4篇 |
排序方式: 共有1979条查询结果,搜索用时 31 毫秒
11.
When describing scenes, speakers gaze at objects while preparing their names (Z. M. Griffin & K. Bock, 2000). In this study, the authors investigated whether gazes to referents occurred in the absence of a correspondence between visual features and word meaning. Speakers gazed significantly longer at objects before intentionally labeling them inaccurately with the names of similar things (e.g., calling a horse a dog) than when labeling them accurately. This held for grammatical subjects and objects as well as agents and patients. Moreover, the time spent gazing at a referent before labeling it with a novel word or accurate name was similar and decreased as speakers gained experience using the novel word. These results suggest that visual attention in speaking may be directed toward referents in the absence of any association between their visual forms and the words used to talk about them. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
12.
13.
动态聚焦技术是为了满足大屏幕高分辨率彩色显像管及高分辨率彩色显示管的发展需求而产生的一项新技术。在本文中,作者首先提出了一种动态聚焦电子枪结构,进行了数值计算与分析,制作了动态聚焦电子枪并装管实验。通过对实验样管的测试与分析。证实该枪性能良好,动态聚集效果明显。 相似文献
14.
15.
Costa Albert; Kovacic Damir; Fedorenko Evelina; Caramazza Alfonso 《Canadian Metallurgical Quarterly》2003,29(6):1270
The authors report 3 picture-word interference experiments in which they explore some properties of the agreement process in speech production. In Experiment 1, Croatian speakers were asked to produce utterances in which the noun's gender value had an impact on the selection of gender-marked freestanding morphemes (pronouns) while ignoring the presentation of same- or different-gender distractor words. In Experiments 2 and 3, Croatian speakers were asked to name the same pictures using noun phrases in which the noun's gender value surfaced as an inflectional suffix. Different-gender distractors interfered more than same-gender distractors (the gender congruency effect) in Experiment 1, but not in Experiments 2 and 3. These contrasting results show that the cause of the gender congruency effect is not at the level where lexical-grammatical information is selected but at the level of selection of freestanding morphemes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
16.
Stewart Abigail J.; Antonucci Toni C.; Veroff Joanne B. 《Canadian Metallurgical Quarterly》2003,58(5):405
Presents an obituary for Elizabeth Douvan (1926-2002). Douvan was a pioneer in the study of changing gender, work, and family roles; personal values; and well-being in the second half of the 20th century. Through her research, she contributed to the interdisciplinary fields of social psychology and women's studies while building and strengthening institutions that remain committed to the same mission. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
17.
Pictures were shown with superimposed word distractors of high and low frequency. Low-frequency distractors produced greater interference on picture naming than did high-frequency distractors. This distractor frequency effect was not affected by manipulations that facilitated or hindered distractor recognition. Interference was reduced for distractors that were read aloud several times prior to being shown in the picture-naming task. Together these findings suggest that the distractor frequency effect has its locus at some stage of lexical access for production. Other findings further constrain hypotheses about which level of speech production is involved in the effect. The distractor frequency effect has implications for models of lexical processing in speaking as well as for accounts of picture-word interference and the frequency effect. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
18.
19.
Motion picture films are susceptible to local degradations such as dust spots. Other deteriorations are global such as intensity
and spatial jitter. It is obvious that motion needs to be compensated for before the detection/correction of such local and
dynamic defects. Therefore, we propose a hierarchical motion estimation method ideally suited for high resolution film sequences.
This recursive block-based motion estimator relies on an adaptive search strategy and Radon projections to improve processing
speed. The localization of dust particles then becomes straightforward. Thus, it is achieved by simple inter-frame differences
between the current image and motion compensated successive and preceding frames. However, the detection of spatial and intensity
jitter requires a specific process taking advantage of the high temporal correlation in the image sequence. In this paper,
we present our motion compensation-based algorithms for removing dust spots, spatial and intensity jitter in degraded motion
pictures. Experimental results are presented showing the usefulness of our motion estimator for film restoration at reasonable
computational costs.
Received: 9 July 2000 / Accepted: 13 January 2002
Correspondence to:S. Boukir 相似文献
20.