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   4406篇
  免费   156篇
  国内免费   70篇
电工技术   38篇
综合类   497篇
化学工业   53篇
金属工艺   19篇
机械仪表   38篇
建筑科学   684篇
矿业工程   40篇
能源动力   101篇
轻工业   83篇
水利工程   23篇
石油天然气   13篇
武器工业   2篇
无线电   353篇
一般工业技术   275篇
冶金工业   471篇
原子能技术   1篇
自动化技术   1941篇
  2023年   53篇
  2022年   58篇
  2021年   169篇
  2020年   166篇
  2019年   94篇
  2018年   144篇
  2017年   245篇
  2016年   384篇
  2015年   219篇
  2014年   353篇
  2013年   349篇
  2012年   270篇
  2011年   257篇
  2010年   231篇
  2009年   212篇
  2008年   224篇
  2007年   214篇
  2006年   196篇
  2005年   138篇
  2004年   117篇
  2003年   125篇
  2002年   97篇
  2001年   80篇
  2000年   29篇
  1999年   38篇
  1998年   18篇
  1997年   11篇
  1996年   11篇
  1995年   12篇
  1994年   6篇
  1993年   3篇
  1992年   12篇
  1991年   4篇
  1989年   5篇
  1987年   4篇
  1986年   3篇
  1985年   3篇
  1984年   5篇
  1983年   4篇
  1968年   3篇
  1966年   4篇
  1965年   3篇
  1964年   6篇
  1963年   3篇
  1962年   4篇
  1961年   10篇
  1958年   3篇
  1956年   2篇
  1955年   3篇
  1954年   3篇
排序方式: 共有4632条查询结果,搜索用时 15 毫秒
991.
建筑业企业核心竞争力的识别与评价   总被引:1,自引:0,他引:1  
本文在分析建筑业企业核心竞争力概念的基础上,结合当前建筑市场环境和建筑行业的发展趋势,给出了建筑业企业核心竞争力的识别框架和评价指标,建立了基于模糊聚类的建筑业企业核心竞争力的评价方法。为了说明该评价体系的适应性和有效性,文章给出了一个仿真算例。  相似文献   
992.
Reports an error in "Perceived social support among college students: Three studies of the psychometric characteristics and counseling uses of the Social Support Inventory" by Steven D. Brown, Theresa Brady, Robert W. Lent, Jenny Wolfert and Sheila Hall (Journal of Counseling Psychology, 1987[Jul], Vol 34[3], 337-354). In Table 5, the reliable change (RC) values for Clients 1-7 on the UCLA Loneliness Scale and the College Student Satisfaction Scale were incorrect. The corrected values are presented in the erratum. In addition, a note should be added to Table 5 that reads: "Posttreatment scores used in the calculation of RC are means obtained from the sum of posttreatment and follow-up scores." (The following abstract of the original article appeared in record 1987-32914-001.) Perceived social support has been shown to relate to psychological distress and well-being. However, measurement of the construct has been limited by a failure to embed perceived support in a body of psychological theory that would suggest how perceived support is produced and modified. In three studies we assessed the psychometric characteristics and counseling uses of a theory-derived measure of perceived social support, the Social Support Inventory (SSI). Results of the first study indicated that the SSI possessed excellent internal consistency reliability and concurrent validity, and it performed in theoretically predicted ways in a series of construct validity analyses. Results of the second study suggested that the SSI may not be influenced by mood state or demand characteristics. The third study concerned a counseling intervention developed from the SSI's theoretical base. Reported outcomes are from the first 7 consecutive college student clients exposed to the intervention for difficulties in their social transition to college. We also describe the person-environment fit theory from which the SSI was derived and discuss future conceptual and research needs on the theory, instrument, and intervention. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
993.
Shrinking resources and the increasing complexity of clinical decisions are stimulating research in knowledge-intensive computer applications for the delivery of social services. The expected benefits of knowledge-intensive applications such as expert systems include improvement in both the quality and the consistency of service delivery, augmentation of institutional memory, and reduced labour costs through greater reliance on paraprofessionals. This paper analyses the likely impacts of knowledge-intensive systems on social service organisations, drawing on trends in related service-delivery fields, and on known impacts of computer applications in organisations. A structural change may be anticipated: decision making and planning functions will shift increasingly from social service professionals to administrators.  相似文献   
994.
This review of the Social Security Administration's information processing efforts by the GAO offers an interesting update to some of the earlier articles that appeared in SOS about Social Security. It appears from the report that progress is being made. However, there have been some changes in a plan that was to result in major improvements in systems at SSA.In particular, the GAO has found the SS Administration does not plan to document existing systems before proceeding with the design of new applications. The investigators are concerned that it will be difficult to develop good specifications if present designs are not documented. On the side of the Administration is the fact that tremendous resources are needed to document existing systems that may be mostly abandoned when new ones are implemented.This discussion of software engineering and design philosophy mirrors what is happening in other organizations faced with the need to make major redesigns of existing applications.  相似文献   
995.
Reviews the book, Assessing and treating culturally diverse clients: A practical guide by Freddy A. Panaigua (see record 1996-97152-000). This book is a timely and provocative delineation of highly relevant considerations to be made by counselors, psychotherapists, and other mental health professionals in the delivery of services to multicultural groups. The book deals with four ethnic populations in the United States—African American, Hispanic, Asian, and American Indian. Panaigua's contribution is part of a series on Multicultural Aspects of Counseling by Sage Publications. The purpose of the series is to increase the mental health practitioner's knowledge and sensitivity to cultural differences and to assist in alleviating bias in the therapeutic process. This purpose is accomplished with precision and insight by Panaigua. Unlike some other books dealing with cultural diversity, Panaigua's work offers specific treatment methods which have been demonstrated to be successful in treating members of the targeted groups. Problem solving and social skills training are recommended in some cases. In other instances, assertiveness training, music therapy, or direct advice are the modalities of choice. In other cases, education, medication, or behavioral approaches are preferred. Assessing and Treating Culturally Diverse Clients can serve the educational needs of graduate students in the fields of psychology, counseling, family therapy, and social work. It is an excellent guide for use in either the training or practice of these helping professions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
996.
21世纪的都市社会学   总被引:1,自引:0,他引:1  
1968年,作者发表了他的第一篇学术文章“真的有都市社会学吗?”。32年后,现在回过头来看这段对于城市社会研究的亲身参与经历,答案是:曾经有;不过现在没有了。不过假如幸运的话,都市社会学会在21世纪复活,发展出一些新的概念、新的研究方法以及新的主题,因为它对于我们理解生活比过去任何时候都显得更加必要。  相似文献   
997.
Editorial.     
In the 6 years since the Journal of Personality and Social Psychology was divided into three sections, Interpersonal Relations and Group Processes (IRGP) has come to be the impoverished sibling in the family. This weakness seems curious in a discipline that concentrates on human interrelatedness as its central theme. Indeed, Gordon Allport's definition in the Handbook of Social Psychology (1968) acknowledged the social core of social psychology: "an attempt to understand and explain how the thoughts, feelings and behaviors of individuals are influenced by the actual, imagined or implied presence of others." Perhaps the short rations to which many readers have become accustomed reflected a reluctance of researchers to engage these phenomena in the individualistic Zeitgeist of the 1970s and early 1980s. Nevertheless, 1986 brings a renewed interest in the scientific study of human social bonds. It is to the dissemination of the very best of this work that this editorship is dedicated. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
998.
This article conceptualizes the construct of the intelligent personality as an indicator of intellectual competence in an attempt to expand the traditional concept of intelligence and account for both ability and nonability determinants of academic performance. Theoretical implications are discussed with regard to recent attempts to (a) explain correlations between personality and intelligence measures, (b) conceptualize novel constructs that may bridge the gap between intelligence and personality, and (c) develop a conceptual model for understanding the relationship among individual differences underlying human performance in real-world settings. Practical implications are also considered, in particular with regard to the validity of the intelligent personality as a predictor of future achievement. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
999.
实践性课程的设置与英语专业高年级听说课程的整合   总被引:2,自引:2,他引:0  
综合实践活动是由学生自主实践和探索,将所这语言知识进行综合运用的全新课程。在教学中突出学生的主体作用和教师的指导作用。在语言教学中体现在学生能够将所学的语言知识和技能运用到文化交际,社会交际和社会实践中。介绍了综合实践性课程在英语专业听说教学中的设计、实施、评价和效果。  相似文献   
1000.
创新是企业发展的动力--西门子发电部考察报告   总被引:3,自引:3,他引:0  
张素心  黄瓯 《热力透平》2003,32(3):160-167,171
通过参观和考察,介绍了西门子公司目前总的状况,尤其对该公司发电部的汽轮机和燃气轮机产品的现状作了重点论述,并从技术特征、核心能力、产品系列以及先进的生产管理等数个方面进行了比较详细的分析,从中得出结论,西门子始终把创新看作企业成功的关键,这对上海汽轮机有限公司的发展有着十分重要的借鉴作用。  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