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   236篇
  免费   7篇
教育   184篇
科学研究   11篇
各国文化   2篇
体育   31篇
文化理论   1篇
信息传播   14篇
  2024年   1篇
  2023年   2篇
  2022年   1篇
  2021年   9篇
  2020年   8篇
  2019年   14篇
  2018年   19篇
  2017年   12篇
  2016年   22篇
  2015年   11篇
  2014年   7篇
  2013年   31篇
  2012年   6篇
  2011年   4篇
  2010年   5篇
  2009年   5篇
  2008年   3篇
  2006年   10篇
  2004年   3篇
  2003年   3篇
  2002年   5篇
  2001年   1篇
  2000年   3篇
  1999年   3篇
  1998年   7篇
  1997年   6篇
  1995年   11篇
  1994年   7篇
  1992年   5篇
  1991年   1篇
  1990年   1篇
  1989年   1篇
  1988年   3篇
  1987年   1篇
  1985年   1篇
  1983年   2篇
  1981年   2篇
  1980年   5篇
  1979年   2篇
排序方式: 共有243条查询结果,搜索用时 0 毫秒
21.
Modern patent systems are slow, inefficient, expensive, and may result in outcomes that actively harm technological progress. This paper proposes a substantive re-think of these systems and lays a foundation upon which practical solutions can be built. Many solutions proposed in the past, such as prior-art bounties, outsourced examination, and dynamic fee setting, have gone unheeded due to the cost of administering them and the rigidity of the patent system. We explore how distributed ledger technologies (DLTs) enable these major changes by altering the way stakeholders are able to interact with the patent records system. We find that transitioning to a DLT-based patent records system can enable many previously suggested improvements to current patent systems in a flexible, scalable, and transparent manner. The case for such a transition is strengthened when jointly considering the complex but common roots of problems facing modern patent systems, rather than a balkanised set of technical solutions to address each issue independently. Noting that a DLT-based system is not a panacea, we also provide comment on the political, legal, and organisational challenges that must be overcome for such changes to be implemented at scale.  相似文献   
22.
Joint presentations of a conditioned stimulus (CS) and an unconditioned stimulus (US) strengthen the contingency between them, whereas presentations of one stimulus without the other degrade this contingency. For example, the CS can be presented without the US either before conditioning (CS–no US and then CS–US; latent inhibition) or after conditioning (CS–US and then CS–no US; extinction). In vertebrate subjects and several invertebrate species, a time lapse usually results in a return of the conditioned response, or spontaneous recovery. However, in land mollusks, spontaneous recovery from extinction has only recently been reported, and response recovery after latent inhibition has not been reported. In two experiments, using conditioned aversion to a food odor as a measure of learning and memory retention, we observed contingency degradation via latent inhibition (Experiment 1) and extinction (Experiment 2) in the common garden slug, Lehmannia valentiana. In both situations, the contingency degradation procedure successfully attenuated conditioned responding, and delaying testing by several days resulted in recovery of the conditioned response. This suggests that the CS–US association survived the degradation manipulation and was retained over an interval of several days.  相似文献   
23.
24.
The present study examined frames and second-level agenda-setting attributes used by national and local newspapers to cover the 2012 Aurora, Colorado shootings. Unlike research examining coverage of school shootings, this study examined a mass shooting that did not occur at a school. Both newspaper types published a similar number of articles—though national articles tended to be longer—and virtually stopped coverage after 18 days. While previous coverage tended to focus on shootings’ societal implications, Aurora coverage focused more on individuals involved in the time immediately surrounding the shootings. National papers focused on the gunman, while the local press tended to focus on victims. Mass shootings in general tend to be salient news items, but the present study further shows news outlets may now focus on incidents’ specifics instead of common characteristics they might share, perhaps because audiences have an existing understanding of them. The shootings were framed in terms of gun control; national newspapers used this frame more often than did local newspapers. Both newspaper types tended to discuss gun control as directly related to the Aurora shootings, rather than as a societal or continuing need. Results offer further evidence that second-level agenda-setting and framing are distinct concepts.  相似文献   
25.
Japanese and South American immigrant mothers' parenting cognitions (attributions and self-perceptions) were compared with mothers from their country of origin (Japan and Argentina, respectively) and European American mothers in the United States. Participants were 231 mothers of 20-month-old children. Generally, South American immigrant mothers' parenting cognitions more closely resembled those of mothers in the United States, whereas Japanese immigrant mothers' cognitions tended to be similar to those of Japanese mothers or intermediate between Japanese and U.S. mothers. This study provides insight into the nature of parenting cognitions generally and those of immigrant mothers specifically and therefore the parenting climate in which immigrant children are reared.  相似文献   
26.
27.
28.
29.
This study investigated the effect of depth of processing on second-language reading comprehension. It was hypothesized that questions which entailed shallow cognitive processing would be easier to answer than questions which entailed deeper cognitive processing. Three of the four research hypotheses were confirmed. Previous training (or lack of it) may account for why one of the predictions was not confirmed. This paper concludes with a cautionary note about the types of reading performance teachers can expect, and the recognition of open-ended testing techniques in secondlanguage reading assessment.  相似文献   
30.
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