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   4559篇
  免费   57篇
  国内免费   10篇
教育   3414篇
科学研究   241篇
各国文化   43篇
体育   405篇
综合类   3篇
文化理论   62篇
信息传播   458篇
  2022年   26篇
  2021年   44篇
  2020年   59篇
  2019年   112篇
  2018年   141篇
  2017年   151篇
  2016年   146篇
  2015年   99篇
  2014年   118篇
  2013年   936篇
  2012年   131篇
  2011年   128篇
  2010年   150篇
  2009年   135篇
  2008年   146篇
  2007年   144篇
  2006年   108篇
  2005年   95篇
  2004年   99篇
  2003年   81篇
  2002年   96篇
  2001年   66篇
  2000年   107篇
  1999年   74篇
  1998年   74篇
  1997年   63篇
  1996年   73篇
  1995年   57篇
  1994年   67篇
  1993年   63篇
  1992年   49篇
  1991年   70篇
  1990年   51篇
  1989年   47篇
  1988年   37篇
  1987年   45篇
  1986年   45篇
  1985年   43篇
  1984年   47篇
  1983年   39篇
  1982年   31篇
  1981年   35篇
  1980年   30篇
  1979年   24篇
  1978年   32篇
  1977年   38篇
  1976年   27篇
  1975年   22篇
  1974年   23篇
  1972年   14篇
排序方式: 共有4626条查询结果,搜索用时 15 毫秒
941.
COUNTER was formally launched in March 2002. Within a year Release 1 of the COUNTER Code of Practice had been published, and a number of leading publishers were working towards making their usage reports COUNTER‐compliant. This article describes the background to COUNTER, the main features of the Code of Practice, the current status of its implementation and the next steps for the project. It also stresses the particular benefits to publishers of COUNTER compliance and of COUNTER membership.  相似文献   
942.
Audiences can and do form parasocial relationships with media personalities. Media personalities, programs, and stations can use social media to enhance this relationship. More and more stations and programs are using social media to cultivate parasocial relations, but the consequences of this cultivation are largely understudied in terms of parasocial responses. This paper examines the fallout on social media of the loss of a parasocial relationship (called “parasocial breakup”) with a large market radio DJ who is removed from the air. The results confirm the presence of a parasocial relationship, feelings of parasocial breakup, and the consequences of these parasocial disruptions on station brand identity.  相似文献   
943.
Understanding the quality of science systems requires international comparative studies, which are difficult because of the lack of comparable data especially about inputs in research. In this study, we deploy an approach based on change instead of on levels of inputs and outputs: an approach that to a large extent eliminates the problem of measurement differences between countries. We firstly show that there are large differences in efficiency between national science systems, defined as the increase in output (highly cited papers) per percentage increase in input (funding). We then discuss our findings using popular explanations of performance differences: differences in funding systems (performance related or not), differences in the level of competition, differences in the level of university autonomy, and differences in the level of academic freedom. Interestingly, the available data do not support these common explanations. What the data suggest is that efficient systems are characterized by a well-developed ex post evaluation system combined with considerably high institutional funding and relatively low university autonomy (meaning a high autonomy of professionals). On the other hand, the less efficient systems have a strong ex ante control, either through a high level of so-called competitive project funding, or through strong power of the university management. Another conclusion is that more and better data are needed.  相似文献   
944.
945.
946.
Lifelong education is getting more and more into the centre of general interest. Small wonder that lifelong education for teachers is a widely discussed subject in circles of teacher education, like the ATEE. By taking up this issue from a somewhat more global point of view Peter Sachsenmeier gives a valuable contribution to those discussions, which seem to form the means by which we–teacher educators–realise our own lifelong education.  相似文献   
947.
Institution-wide planning, to be effective, must have the support of key administrators. Presidents, vice-presidents, deans, and directors must feel that sufficient consensus can be reached on explicit goals to make comprehensive planning possible and worthwhile. While much has been written about the importance of CEO leadership in gaining broad support for planning, little has been said about the role of the chief planning officer in this regard. This paper, based on a national survey of administrators' views of planning, studies the relationship between having a chief planning officer and administrators' perceptions of campus planning. Its intended audience includes all those interested in institutional planning.Presented at the Thirty-first Annual Forum of the Association for Institutional Research, San Francisco, May 26–29, 1991.  相似文献   
948.
Denmark, Sweden, Norway, Finland and Iceland: these are the Nordic countries, the Five Swans. This article covers main Nordic guidance issues with characteristic examples from the various countries under the headings of Professionalisation, Guidance Policies, Activities, Staff and professional background, Linkages, and Materials and ICT. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
949.
Ducklings (Anas Platyrhynchos domesticus) older than the so-called critical period (Days 1 and 2 posthatch) were exposed to an imprinting stimulus after various experimental histories. The first study found that in previously isolated 10-day-old subjects the stimulus exhibited the same capacity to reinforce an operant response and to generate a burst-like pattern of responding as in ducklings imprinted to it on Day 1. In Experiment 2, an imprinting stimulas exhibited reinforcing capacities in 5 to 10-day-old ducklings that had previously been imprinted to a different stimulus. Most of these ducklings came to prefer the second imprinting stimulus over the first. Experiment 3 revealed that in 5-day-old ducklings with a prior history of imprinting to a different stimulus, the otherwise neutral features of a new imprinting stimulus acquired the same kind of persistent control over distress vocalization that they acquire in younger, naive subjects. In all these studies, the only difference between imprinting in older vs. younger subjects was that in older subjects a novel imprinting stimulus initially evoked fear reactions rather than filial behavior. These findings contradict the traditional view of imprinting as an irreversible process that occurs only during a brief critical period, but are entirely consistent with a reinforcement model of imprinting.  相似文献   
950.
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