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   21238篇
  免费   603篇
  国内免费   491篇
电工技术   149篇
技术理论   5篇
综合类   6696篇
化学工业   1122篇
金属工艺   596篇
机械仪表   601篇
建筑科学   2332篇
矿业工程   98篇
能源动力   42篇
轻工业   554篇
水利工程   127篇
石油天然气   67篇
武器工业   7篇
无线电   895篇
一般工业技术   857篇
冶金工业   4588篇
原子能技术   36篇
自动化技术   3560篇
  2024年   60篇
  2023年   186篇
  2022年   346篇
  2021年   511篇
  2020年   381篇
  2019年   323篇
  2018年   239篇
  2017年   248篇
  2016年   315篇
  2015年   441篇
  2014年   1120篇
  2013年   894篇
  2012年   1105篇
  2011年   1464篇
  2010年   1551篇
  2009年   1544篇
  2008年   1362篇
  2007年   1272篇
  2006年   1268篇
  2005年   1160篇
  2004年   1012篇
  2003年   1017篇
  2002年   940篇
  2001年   516篇
  2000年   441篇
  1999年   296篇
  1998年   136篇
  1997年   99篇
  1996年   72篇
  1995年   71篇
  1994年   57篇
  1993年   55篇
  1992年   66篇
  1990年   71篇
  1989年   77篇
  1988年   100篇
  1987年   74篇
  1986年   75篇
  1984年   50篇
  1982年   59篇
  1979年   51篇
  1966年   50篇
  1964年   54篇
  1963年   54篇
  1959年   63篇
  1958年   51篇
  1957年   77篇
  1956年   50篇
  1955年   99篇
  1954年   64篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
Psychologists within a positive psychology framework have proposed the existence of a set of psychological strengths that buffer against the development of psychopathology. To date, most research efforts in positive psychology have focused on adults. This longitudinal study tested the prediction that adolescents' judgments of life satisfaction moderate the influence of stressful life events on the subsequent development of psychopathological behavior. Using a sample of 816 middle and high school students, the study demonstrated support for the moderational model for externalizing behavior outcomes, but not internalizing behavior problems. Specifically, adolescents with positive life satisfaction (vs. those who were dissatisfied with their lives) were less likely to develop later externalizing behaviors in the face of stressful life events. The study also revealed that adolescent life satisfaction reports show moderate stability across a one-year time frame and independently predict subsequent externalizing behavior even while controlling for prior levels of externalizing behavior... (PsycINFO Database Record (c) 2011 APA, all rights reserved)  相似文献   
22.
Introduces the current issue of the American Psychologist, which examines the ramifications of the Brown vs. Board of Education decision and its sequelae over the last 50 years, with a special focus on the mixed role of psychological research and practice. Despite the great strides toward a more just society since May 17, 1954, inequities remain in schooling, in social relations, and in economic opportunity. How will history judge American psychology 50 years from now vis-a-vis the possibilities it helped create via Brown? The articles in this special issue suggest several important directions of research and action our field will need to take if the verdict of history is to be a positive one. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
23.
Yasmine Motarjemi   《Food Control》2006,17(12):1018-1022
The Industry Council for Development (ICD) is an Industry Non Governmental Organisation established in 1990; it aims to contribute to improving public health through partnership projects on food safety and nutrition. This paper presents ICD’s activities in the past years and explains the reasons why the food industry should have a vested interest in supporting training and education of health professionals in food safety.  相似文献   
24.
25.
Abstract This article presents a study of a large scale incorporation of one data acquisitionsystem into physics teaching in Israel. By 1994 about 30% of the schools throughout the country used the V-scope, a 3-D multibody motion tracing system, in their lab programme. The views and reactions of post-training teachers, experienced teachers and students on various aspects of using the system are described, analysed and compared.  相似文献   
26.
电工电子系列课程的改革实践与整合优化   总被引:14,自引:7,他引:7  
介绍了东南大学电工电子系列课程的整体结构,阐述了下一步课程整合的方案并指出了课程改革中应注意的一些问题。  相似文献   
27.
Presents the 2003 APA Award for Distinguished Scientific Applications of Psychology. A list of the members of the APA committee who selected the recipients for this year and a list of the previous recipients of this award from 1973 through 2003 are provided. The award recipients for 2003 are Stephen J. Ceci and Elizabeth F. Loftus. The award citation, biography, selected bibliography and the award addresses for both award recipients are included. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
28.
Presents an obituary for Nicholas Hobbs. Just at the end of his stellar career of public service through psychology, Nick Hobbs received very appropriate honors showing that psychologists and many others knew what a precious national resource his life had been. Only days before his death from cancer on January 23, 1983, he participated in the dedication of the Nicholas Hobbs Laboratory of Human Development of the Peabody College for Teachers of Vanderbilt University, part of the Kennedy Center for Research on Education and Human Development that he founded and directed at its beginning. Two years earlier, he had received two parallel American Psychological Association (APA) awards--one for Distinguished Contributions to Psychology in the Public Interest and another for Distinguished Professional Contributions "utilizing psychological knowledge in the public interest and social policy." As the citations and testimonials on these occasions variously noted, Nick gave creative, responsible, and effective service to the institutions that he helped administer, to the Southern region from which he sprang, to the APA, and to the profession of psychology, but above all to the nation's children and youth, especially those who grew up with disadvantage and difficulty. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
29.
目的观察迪银片治疗银屑病的临床疗效。方法30例银屑病患者,口服迪银片8周,采用PASI评分法评价治疗前后效果,并观察有无不良反应发生。结果患者痊愈率56.7%,显效率36.7%,总有效率93.3%,无明显的不良反应。结论迪银片是临床治疗银屑病的有效药物之一。  相似文献   
30.
How can psychologists and graduate students become more affirmative of lesbian, gay, bisexual, and transgender (LGBT) issues? Safe Zone is a diversity-training program to increase sensitivity toward, knowledge of, and advocacy for LGBT populations and issues that affect them. In this exploratory study, the implementation of Safe Zone is described within a school of professional psychology; its effectiveness was assessed by self-reported behavioral and attitudinal changes and from participant evaluations. Results were encouraging with regard to the goals of Safe Zone and its adaptation to institutions interested in improving relations with the LGBT community, but additional empirical studies are needed. (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