首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8072篇
  免费   1115篇
  国内免费   720篇
电工技术   276篇
综合类   807篇
化学工业   186篇
金属工艺   138篇
机械仪表   439篇
建筑科学   492篇
矿业工程   101篇
能源动力   32篇
轻工业   231篇
水利工程   50篇
石油天然气   75篇
武器工业   68篇
无线电   873篇
一般工业技术   974篇
冶金工业   1813篇
原子能技术   22篇
自动化技术   3330篇
  2024年   36篇
  2023年   205篇
  2022年   282篇
  2021年   373篇
  2020年   351篇
  2019年   299篇
  2018年   283篇
  2017年   242篇
  2016年   332篇
  2015年   297篇
  2014年   429篇
  2013年   469篇
  2012年   514篇
  2011年   626篇
  2010年   569篇
  2009年   581篇
  2008年   568篇
  2007年   581篇
  2006年   511篇
  2005年   435篇
  2004年   365篇
  2003年   299篇
  2002年   265篇
  2001年   225篇
  2000年   138篇
  1999年   98篇
  1998年   58篇
  1997年   50篇
  1996年   56篇
  1995年   30篇
  1994年   40篇
  1993年   21篇
  1992年   20篇
  1991年   18篇
  1990年   16篇
  1989年   16篇
  1988年   12篇
  1985年   20篇
  1984年   14篇
  1979年   7篇
  1966年   9篇
  1965年   8篇
  1964年   17篇
  1963年   7篇
  1961年   7篇
  1958年   12篇
  1957年   7篇
  1956年   9篇
  1955年   16篇
  1954年   8篇
排序方式: 共有9907条查询结果,搜索用时 15 毫秒
51.
数据处理是编程的主要内容,字符数据作为一种重要的数据形式,在程序中应用非常广泛,而程序处理则比较复杂。本文以字符数据为例,着重分析与研究VC程序中字符串数据处理的几个主要方面,包括字符串的表示、处理和传递。  相似文献   
52.
介绍液晶显示屏的基本结构以及液晶电视的显像原理 ,并讨论液晶电视技术在视角、反应速度、亮度、对比度、开口率、残像消除等方面的一些新发展 ,对比液晶电视、等离子电视、传统显像管电视的特点。  相似文献   
53.
文中叙述了以实验的方法所进行的人工智能视觉领域的基础性某些图形识别的研究工作。在实验中将一些字母和图形按拓扑结构和几何性质分组。试图寻找人类视觉在图形识别过程中的一些规律,运用了模糊数学中的综合评定法。  相似文献   
54.
Presents the citation for Anthony D. Wagner, who received the Award for Distinguished Scientific Early Career Contributions to Psychology (cognition and human learning) "for outstanding and innovative research on the neural basis of memory and executive control." A brief profile and a selected bibliography accompany the citation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
55.
Multiple forms of a symbol-digit substitution task were used to provide a componential analysis of age differences in coding task performance. The results demonstrated age differences in feature encoding, memory, and visual search. A 2nd experiment was conducted with young adults to investigate a sensory deficit as a locus of age differences. The spatial contrast sensitivity deficit of older adults was simulated on forms by applying a digital filter. Persons in the age-simulated contrast condition performed worse than those in the normal contrast condition. The stimulus degradation effect was linked to visual search speed. The study illustrates the utility of componential analysis and offers direct support for the hypothesis that sensory deficits affect performance on tasks used to assess intelligence (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
56.
Object substitution masking (OSM) is said to occur when a perceptual object is hypothesized that is mismatched by subsequent sensory evidence, leading to a new hypothesized object being substituted for the first. For example, when a brief target is accompanied by a longer lasting display of nonoverlapping mask elements, reporting of target features may be impaired. J. T. Enns and V. Di Lollo (2000) considered it an outstanding question whether OSM masks some or all aspects of a target. The authors report three experiments demonstrating that OSM can selectively affect target features. Participants may be able to detect a target while being unable to report other aspects of it or to report the color but not the orientation of a target (or vice versa). We discuss these findings in relation to two other visual phenomena. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
57.
Parental power assertion is traditionally studied in the behavioral domain--discipline triggered by the child's immediate misbehavior--but rarely in the cognitive domain--parent-child discussions of the child's past misbehavior. Maternal power assertion was observed in "do" and "don't" discipline contexts from 14 to 45 months and in the context of mother-child discourse about a recent misbehavior at 56 months. Mothers' use of power cohered across the "do," "don't," and discourse contexts, but its implications were domain specific. Power assertion in the "don't" discipline context predicted behavioral outcomes (more moral conduct at 56 and 73 months, less antisocial conduct at 73 months) but not cognitive outcomes (moral cognition at 56 and 73 months). Power assertion in the discourse context predicted less mature moral cognition but not moral or antisocial conduct. Mothers' high Neuroticism predicted more power assertion in all three contexts. Child effects were examined. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
58.
This article reviews the evidence and theory pertaining to a form of perspective-taking failure--a difficulty in setting aside the privileged information that one knows to be unavailable to another party. The authors argue that this bias (epistemic egocentrism, or EE) is a general feature of human cognition and has been tapped by 2 independent and largely uncommunicating research traditions: the theory-of-mind tradition in developmental psychology and, with more sensitive probes, the "heuristics and biases" tradition in the psychology of human judgment. This article sets the stage for facilitating communication between these traditions as well as for the recognition of EE's breadth and potential interdisciplinary significance. The authors propose a life-span account and a tentative taxonomy of EE; and they highlight the interdisciplinary significance of EE by discussing its implications for normative ethics. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
59.
During social interactions, people's eyes convey a wealth of information about their direction of attention and their emotional and mental states. This review aims to provide a comprehensive overview of past and current research into the perception of gaze behavior and its effect on the observer. This encompasses the perception of gaze direction and its influence on perception of the other person, as well as gaze-following behavior such as joint attention, in infant, adult, and clinical populations. Particular focus is given to the gaze-cueing paradigm that has been used to investigate the mechanisms of joint attention. The contribution of this paradigm has been significant and will likely continue to advance knowledge across diverse fields within psychology and neuroscience. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
60.
Stimulus control of ring swimming was studied with male Siamese fighting fish (Betta splendens) using 2-component multiple schedules in which the components were correlated with the presence or absence of air bubbles in the water. In Experiment 1, either response-independent mirror presentations or extinction was juxtaposed with immediate response-dependent mirror presentations. Rates of ring swimming generally were higher with immediate reinforcement than with either response-independent mirror presentations or extinction. In Experiment 2, different durations of response-dependent mirror presentations were juxtaposed. Generally, higher rates of ring swimming occurred with 15-s than with 0-, 1-, or 3-s durations. Results demonstrate that stimulus control of responding can be established with these fish under several conditions of differential reinforcement. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号