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   714篇
  免费   62篇
  国内免费   37篇
电工技术   13篇
综合类   51篇
化学工业   8篇
金属工艺   1篇
机械仪表   9篇
建筑科学   48篇
矿业工程   1篇
能源动力   7篇
轻工业   14篇
水利工程   5篇
石油天然气   1篇
无线电   26篇
一般工业技术   63篇
冶金工业   280篇
自动化技术   286篇
  2024年   8篇
  2023年   9篇
  2022年   33篇
  2021年   30篇
  2020年   23篇
  2019年   33篇
  2018年   21篇
  2017年   15篇
  2016年   26篇
  2015年   18篇
  2014年   30篇
  2013年   56篇
  2012年   26篇
  2011年   42篇
  2010年   31篇
  2009年   37篇
  2008年   35篇
  2007年   39篇
  2006年   26篇
  2005年   44篇
  2004年   50篇
  2003年   43篇
  2002年   39篇
  2001年   15篇
  2000年   7篇
  1999年   13篇
  1998年   5篇
  1997年   3篇
  1996年   4篇
  1995年   4篇
  1994年   2篇
  1993年   5篇
  1992年   3篇
  1988年   2篇
  1987年   2篇
  1986年   2篇
  1984年   2篇
  1983年   3篇
  1982年   2篇
  1981年   3篇
  1980年   2篇
  1976年   2篇
  1975年   2篇
  1974年   2篇
  1964年   3篇
  1960年   3篇
  1959年   1篇
  1958年   1篇
  1957年   1篇
  1954年   1篇
排序方式: 共有813条查询结果,搜索用时 22 毫秒
41.
The present study examined the relationship between a set of individual and contextual variables and high-risk alcohol use among young offenders placed on community orders in New South Wales, Australia. Participants (n = 777) were compared on a set of factors known to be strong predictors of high-risk alcohol use among adolescents. The authors assessed the strength of the relationship between gender, age, ethnicity, geographical region of residence, school attendance, father absence, history of childhood trauma, and the presence of severe conduct disorder on weekly levels of alcohol use. Living in rural locations, not currently attending school, being female, and not having been raised with a biological father present were associated with significantly increased odds of alcohol abuse. Father absence was a more important risk factor for rural young offenders, but school dropout was associated with more hazardous drinking among young offenders in urban areas. Accordingly, the authors suggest family-focused intervention programs for young offenders living in rural areas and school-based programs for vulnerable young people living in urban areas, although programs should consider including both factors for both groups if feasible and warranted. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
42.
The authors report results from 2 studies assessing the extent to which narcissism is related to self- and other ratings of leadership, workplace deviance, and task and contextual performance. Study 1 results revealed that narcissism was related to enhanced self-ratings of leadership, even when controlling for the Big Five traits. Study 2 results also revealed that narcissism was related to enhanced leadership self-perceptions; indeed, whereas narcissism was significantly positively correlated with self-ratings of leadership, it was significantly negatively related to other ratings of leadership. Study 2 also revealed that narcissism was related to more favorable self-ratings of workplace deviance and contextual performance compared to other (supervisor) ratings. Finally, as hypothesized, narcissism was more strongly negatively related to contextual performance than to task performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
43.
The solution of Markov Decision Processes (MDPs) often relies on special properties of the processes. For two-level MDPs, the difference in the rates of state changes of the upper and lower levels has led to limiting or approximate solutions of such problems. In this paper, we solve a two-level MDP without making any assumption on the rates of state changes of the two levels. We first show that such a two-level MDP is a non-standard one where the optimal actions of different states can be related to each other. Then we give assumptions (conditions) under which such a specially constrained MDP can be solved by policy iteration. We further show that the computational effort can be reduced by decomposing the MDP. A two-level MDP with M upper-level states can be decomposed into one MDP for the upper level and M to M(M-1) MDPs for the lower level, depending on the structure of the two-level MDP. The upper-level MDP is solved by time aggregation, a technique introduced in a recent paper [Cao, X.-R., Ren, Z. Y., Bhatnagar, S., Fu, M., & Marcus, S. (2002). A time aggregation approach to Markov decision processes. Automatica, 38(6), 929-943.], and the lower-level MDPs are solved by embedded Markov chains.  相似文献   
44.
一种基于字词结合的汉字识别上下文处理新方法   总被引:6,自引:0,他引:6  
根据字、词信息之间的互补性,提出一种字、词结合的上下文处理方法.在单字识别的基础上,首先利用前向一后向搜索算法在较大的候选集上进行基于字bigram模型的上下文处理,在提高文本识别率的同时可提高候选集的效率;然后在较小的候选集上进行基于词bigram模型的上下文处理.该方法在兼顾处理速度的同时,可有效地提高文本识别率.脱机手写体汉字文本(约6.6万字)识别中的实验表明:经字bigram模型处理,文本识别率由处理前的81.58%提高至94.50%,文本前10选累计正确率由94.33%提高到98.25%;再经词bigram模型处理,文本识别率进一步提高至95.75%。  相似文献   
45.
46.
The authors discussed to what degree testimony from social science and mental health experts (psychologists, psychiatrists, social workers, therapists, others) meets admissibility requirements expressed by the U.S. Supreme Court in Daubert (1993), Joiner ( General Electric Co. v. Joiner , 1997) and the recent Kumho (1999) decision. They reviewed data on Daubert/Kumho indicia of reliability using 2 exemplar areas of mental health testimony: psychodiagnostic assessment by means of the Rorschach and other "projective" assessment techniques and the diagnoses of posttraumatic stress disorder and multiple personality disorder (dissociative identity disorder). They concluded that some testimony offered by mental health professionals relating to these concepts should not survive scrutiny under the framework of Daubert , Joiner , and Kumho . (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
47.
Differences in performance with various stimulus-response mappings are among the most prevalent findings for binary choice reaction tasks. The authors show that perceptual or conceptual similarity is not necessary to obtain mapping effects; a type of structural similarity is sufficient. Specifically, stimulus and response alternatives are coded as positive and negative polarity along several dimensions, and polarity correspondence is sufficient to produce mapping effects. The authors make the case for this polarity correspondence principle using the literature on word-picture verification and then provide evidence that polarity correspondence is a determinant of mapping effects in orthogonal stimulus-response compatibility, numerical judgment, and implicit association tasks. The authors conclude by discussing implications of this principle for interpretation of results from binary choice tasks and future model development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
48.
The use of automatic theorem proving is considered as a methodological basis of fuzzy situational search for decisions.  相似文献   
49.
Nine experiments examined the means by which visual memory for individual objects is structured into a larger representation of a scene. Participants viewed images of natural scenes or object arrays in a change detection task requiring memory for the visual form of a single target object. In the test image, 2 properties of the stimulus were independently manipulated: the position of the target object and the spatial properties of the larger scene or array context. Memory performance was higher when the target object position remained the same from study to test. This same-position advantage was reduced or eliminated following contextual changes that disrupted the relative spatial relationships among contextual objects (context deletion, scrambling, and binding change) but was preserved following contextual change that did not disrupt relative spatial relationships (translation). Thus, episodic scene representations are formed through the binding of objects to scene locations, and object position is defined relative to a larger spatial representation coding the relative locations of contextual objects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
50.
Interlocutory injunctions in construction litigation cases are not uncommon, in particular, in construction nuisance cases. Despite its importance, there are only a few written materials dealing with this topic. With the public increasingly aware of their legal rights, it is anticipated that the number of interlocutory injunction applications will remain high in the foreseeable future. It is now timely and a worthwhile exercise to revisit those principles governing the courts’ discretion in granting and rejecting interlocutory injunctions. This paper discusses those factors that are relevant in exercising that discretion and how they should be assessed. It also examines the principles established by Lord Diplock in the landmark case “American Cyanamid,” i.e., how this case influenced judgments in recent Hong Kong construction cases. The paper concludes by summarizing the overriding principles in interlocutory injunction applications.  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