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   863篇
  免费   62篇
  2023年   14篇
  2022年   9篇
  2021年   20篇
  2020年   29篇
  2019年   35篇
  2018年   39篇
  2017年   47篇
  2016年   44篇
  2015年   39篇
  2014年   33篇
  2013年   101篇
  2012年   50篇
  2011年   46篇
  2010年   27篇
  2009年   36篇
  2008年   31篇
  2007年   27篇
  2006年   34篇
  2005年   28篇
  2004年   26篇
  2003年   20篇
  2002年   29篇
  2001年   12篇
  2000年   9篇
  1999年   12篇
  1998年   6篇
  1997年   5篇
  1996年   5篇
  1995年   3篇
  1994年   4篇
  1993年   5篇
  1992年   5篇
  1991年   6篇
  1989年   6篇
  1988年   3篇
  1987年   6篇
  1986年   3篇
  1985年   6篇
  1984年   7篇
  1983年   6篇
  1982年   7篇
  1981年   6篇
  1980年   5篇
  1978年   4篇
  1977年   6篇
  1976年   3篇
  1974年   5篇
  1973年   2篇
  1972年   2篇
  1971年   2篇
排序方式: 共有925条查询结果,搜索用时 15 毫秒
861.
862.
863.
ABSTRACT

Emerging flexibilities are apparent in gatekeeping regimes applicable to regenerative medicine products, raising issues about the extent to which and forms in which such flexibilities might promote emerging products as a sector warranting special treatment, in the context of recent policy developments in the UK and wider European Union. Concepts of ‘gatekeeping’, ‘gatekeeping regimes’ and ‘gateways’ can point to the ways in which regulatory institutions, health technology assessment organisations, and national planners and purchasers of health services together define and control entry to the medical product marketplace and the adoption of products into the public health-care system. Flexibilities in existing regimes and new gateways are a way of maintaining ‘connection’ between gatekeeping regimes and technoscientific innovation in order to steer innovation pathways. The gateways concept has affinity with that of Callon’s ‘obligatory passage points’. A wide set of recent policy documents show that the measures promoted exhibit a range of alternative gateways that are being constructed around central, legal, restrictive gatekeeping regimes. However, it would be easy to overestimate the significance of these developments as relaxations that would favour innovative producers and their products on a large scale with wide public health impacts. The concepts of gatekeeping regimes and gateways enable understanding of hybrid developments of exceptions and exemptions to dominant regimes which bridge across the arenas of market regulation, health technology assessment and health-care system planning. These arenas are being drawn closer together as a means of politically managing stakeholders’ aims in the UK, EU and other innovating biomedical health systems globally.  相似文献   
864.
865.
ABSTRACT: This paper reexamines the “Scandinavian Suicide Phenomenon,” the observation that reported suicides are typically high in Denmark and Sweden and typically low in Norway even though these three countries seem otherwise similar. It has been suggested that in Norway more suicides are reported as accidental death or as death due to unknown causes. This paper explores this possibility by means of a detailed examination of causes of death. Nine other countries are included in the comparisons to facilitate interpretation of the findings. It was found that there were significantly higher rates of accidental and unclassified deaths in Norway than in Denmark or Sweden; if it is assumed that many of these are suicide, this could account for the reported differences in suicide rates.  相似文献   
866.
867.
868.
The self‐reference effect (SRE) is the reliable memory advantage for information encoded about self over material encoded about other people. The developmental pathway of the SRE has proved difficult to chart, because the standard SRE task is unsuitable for young children. The current inquiry was designed to address this issue using an ownership paradigm, as encoding objects in the context of self‐ownership have been shown to elicit self‐referential memory advantages in adults. Pairs of 4‐ to 6‐year‐old children (= 64) sorted toy pictures into self‐ and other‐owned sets. A surprise recognition memory test revealed a significant advantage for toys owned by self, which decreased with age. Neither verbal ability nor theory of mind attainment predicted the size of the memory advantage for self‐owned items. This finding suggests that contrary to some previous reports, memory in early childhood can be shaped by the same self‐referential biases that pervade adult cognition.  相似文献   
869.
870.
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