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   8414篇
  免费   1014篇
  国内免费   908篇
电工技术   277篇
技术理论   4篇
综合类   1348篇
化学工业   138篇
金属工艺   202篇
机械仪表   698篇
建筑科学   535篇
矿业工程   101篇
能源动力   46篇
轻工业   127篇
水利工程   92篇
石油天然气   80篇
武器工业   66篇
无线电   465篇
一般工业技术   685篇
冶金工业   546篇
原子能技术   18篇
自动化技术   4908篇
  2024年   85篇
  2023年   199篇
  2022年   329篇
  2021年   302篇
  2020年   244篇
  2019年   202篇
  2018年   174篇
  2017年   154篇
  2016年   221篇
  2015年   219篇
  2014年   339篇
  2013年   483篇
  2012年   431篇
  2011年   472篇
  2010年   447篇
  2009年   495篇
  2008年   532篇
  2007年   623篇
  2006年   593篇
  2005年   524篇
  2004年   509篇
  2003年   459篇
  2002年   378篇
  2001年   345篇
  2000年   297篇
  1999年   264篇
  1998年   154篇
  1997年   100篇
  1996年   109篇
  1995年   126篇
  1994年   96篇
  1993年   82篇
  1992年   66篇
  1991年   56篇
  1990年   41篇
  1989年   53篇
  1988年   37篇
  1987年   16篇
  1986年   15篇
  1985年   13篇
  1984年   3篇
  1980年   3篇
  1979年   5篇
  1968年   3篇
  1966年   3篇
  1965年   3篇
  1963年   4篇
  1962年   3篇
  1960年   3篇
  1958年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
异构空间信息的分级共识模型研究   总被引:2,自引:0,他引:2  
Internet上异构、分布的空间信息因各自独立、相对封闭而无法相互沟通和协作,从而形成了空间信息孤岛。论文利用计算机的知识表示理论和Ontology技术能够明确表达相关领域共识的特点,探索性地提出了异构空间信息的分级共识模型。该模型为解决上述问题提供了一条切实可行的新思路。  相似文献   
52.
面向对象的CAPP系统工艺知识表达   总被引:2,自引:0,他引:2  
知识是人们在长期的生活及社会实践中、科学研究及实验中积累起来的对客观世界的认识与经验。工艺知识表达是CAPP系统的重要部分。本文介绍了工艺知识的种类,同时介绍了对工艺知识进行表示与组织的几种方法。以工艺知识中的制造资源为例,着重介绍了面向对象方法的概念及其描述形式。  相似文献   
53.
The use of multivalued logics for knowledge representation and nonmonotonic reasoning has often been advocated, in particular within the general framework proposed by Ginsberg in his paper "Multivalued logics: a uniform approach to reasoning in artificial intelligence." His system is based on a multivalued logic with an arbitrary number of truth values classified with respect to two partial orders, a truth order and a knowledge order. This classification is very interesting and gives an intuitive appeal to the framework. In this paper the work by Ginsberg is critically reviewed, pointing out some flaws and ways to overcome them. Moreover, we present some ideas on how to modify the original schema in order to obtain a more semantically well-founded framework.
L'utilisation de la Iogique multivalente pour la représentation des connaissances et le raisonnement non monotone a souvent été préconisée, en particulier à l'intérieur du cadre général proposé par Ginsberg dans son article intitulé〘 Multivalued logics: a uniform approach to reasoning in artificial intelligence 〙 Son système est basé sur une logique multivalente comportant un nombre arbitraire de valeurs de vérité classées selon deux ordres partiels: un ordre de vérité et un ordre de connaissances. Cette classification est très intéressante et donne un attrait intuitif au cadre. Dans cet article, l'auteur examine le travail de Ginsberg, y relève des lacunes et propose des moyens de les corriger. De plus, il expose certaines idées en vue de modifier le schéma original et ainsi obtenir un meilleur cadre du point de vue de la sémantique.  相似文献   
54.
The authors report results of a study into the role of components of first-language (L1; Dutch) and second-language (L2; English) reading comprehension. Differences in the contributions of components of L1 and L2 reading comprehension are analyzed, in particular processing speed in L1 and L2. Findings indicate that regression weights of the L1 and L2 components are different. Although correlations between most processing speed components and reading comprehension are substantial, there are no unique contributions to the explanation of either L1 or L2 reading comprehension when linguistic and metacognitive knowledge are accounted for. In addition, L1 reading comprehension is shown to have a large contribution to L2 reading comprehension, supporting theories of L1-L2 transfer of reading skills. Results are discussed from a developmental perspective. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
55.
An application of expert hierarchical control is described in this paper. The control is implemented in a two-level configuration, where the lower layer performs direct regulation control and the upper layer performs supervisory functions. In the regulation layer, a rule-based controller performs the regulation task, where the controller is constructed upon causal relations between subsystems. The control action is inferred from the measurement of both controlled and noncontrolled variables. In the supervisory layer, the main function is a fault diagnosis system which diagnoses faults on-line. The diagnosis is based upon reasoning from the structure of the system and the functions of its components, and efficient diagnosis is achieved by dividing the system into several subsystems. The overall technique has been successfully implemented on a pilot scale mixing process under on-line computer control.  相似文献   
56.
 分析了如何利用中间件技术支持专业知识获取的问题.提出了基于XML,SOAP,UDDI和WSDL的web服务技术的专业知识获取的中间件应用模式,它可以有效解决消息传送、服务功能的抽象描述以及服务在网络上的发布与发现等问题。以固定瓦推力滑动轴承的性能参数计算Web服务为实例,指出web服务是分布式设计知识获取和知识资源集成的有效途径.  相似文献   
57.
Ten areas of health knowledge were investigated in 2 studies, 1 of college students (N=169) and 1 of adults from the community (ages 19-70; N=176). Measures assessed knowledge of aging, orthopedic/ dermatological concerns, common illnesses, childhood/early life, serious illnesses, mental health, nutrition, reproduction, safety, and treatment of illness/disease. Significant gender differences favoring women were found for most areas of health knowledge, especially reproduction and early life. Results showed that cognitive ability accounted for the most variance in health knowledge with nonability (personality and interest traits) and demographic variables accounting for smaller but significant amounts of variance across most knowledge domains. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
58.
The aim of this study was to bring to the surface the strategic use of imitative processes in the context of a 2-route model: (a) direct imitation, used in reproducing new, meaningless actions, and (b) imitation based on stored semantic knowledge of familiar meaningful actions. Three experiments were carried out with healthy participants who reproduced meaningful and meaningless actions within an established time limit. The study investigated 3 factors that could potentially affect the selection of processes used for imitation: (a) the composition of the experimental list (blocked or mixed presentation), (b) the presence-absence of instructions (Experiments 1 and 2), and (c) the relative proportions of the stimuli (Experiment 3). Overall, the results suggest that each of these factors influences the selection of imitative strategies in healthy individuals with temporarily reduced capacities, as happens in the case of brain-damaged patients. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
59.
知识经济对领导方法提出了新的要求,也使传统的领导方法面临严峻挑战,知识经济时代所需要的领导方法具有开拓创新性。  相似文献   
60.
People have knowledge about relationships (i.e., relational schemas) that is based on their experiences. Because most people have experience with complementary behavior (interaction partners behaving similarly in terms of affiliation but oppositely in terms of control), they expect complementary behavior in their relationships. Like other beliefs about relationships, expectations of complementarity affect self-construal. The authors provide evidence for complementary self-construal; people assimilate to relevant relationship partners on the affiliation dimension and contrast on the control dimension. Consistent with the proposed role of relationship knowledge in these effects, complementary self-construal was moderated by the familiarity of the target, whether people focused on their relationship with or the appearance of the target, and whether the context was relevant for the interpersonal dimension. (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