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   845篇
  免费   42篇
各国政治   64篇
工人农民   59篇
世界政治   101篇
外交国际关系   41篇
法律   495篇
中国政治   2篇
政治理论   125篇
  2023年   12篇
  2022年   9篇
  2021年   21篇
  2020年   29篇
  2019年   29篇
  2018年   45篇
  2017年   60篇
  2016年   52篇
  2015年   29篇
  2014年   41篇
  2013年   113篇
  2012年   39篇
  2011年   21篇
  2010年   18篇
  2009年   20篇
  2008年   27篇
  2007年   41篇
  2006年   31篇
  2005年   31篇
  2004年   35篇
  2003年   25篇
  2002年   29篇
  2001年   24篇
  2000年   9篇
  1999年   10篇
  1998年   2篇
  1997年   3篇
  1996年   5篇
  1993年   2篇
  1992年   5篇
  1991年   6篇
  1990年   6篇
  1989年   7篇
  1988年   4篇
  1987年   4篇
  1985年   1篇
  1984年   4篇
  1983年   4篇
  1981年   1篇
  1979年   3篇
  1978年   1篇
  1977年   1篇
  1975年   1篇
  1974年   1篇
  1973年   7篇
  1972年   5篇
  1971年   9篇
  1970年   1篇
  1966年   1篇
  1965年   1篇
排序方式: 共有887条查询结果,搜索用时 15 毫秒
881.
The variation in the epidermal ridge's width between the sexes, during various growth stages, and among different populations has been previously assessed. However, the changes that occur with aging are barely known.The goal of this study was to analyse the degree of variation in epidermal ridge width due to aging. So that, fingerprint ridge density was estimated to establish their relationship with body and hand size changes that typically occur in adulthood.In this study, a sample of 213 adults of both sexes from a Spanish native population of different age ranges—18–30?years old (“junior” group) and 50–66?years old (“senior” group)—was used. Ridge density was assessed in three counting areas of the distal phalanx of each finger (radial, ulnar, and proximal). Height, weight, and a set of anthropometric measurements for both hands were also taken.Our results show that ridge density is higher in females than males throughout adulthood and decreases with aging in the radial and ulnar areas (as the hands widen) but not in the proximal region. Thus, a relationship between hand dimensions and ridge density was found.The data indicate that aging changes may conceal the recognized sex differences in ridge density, and so a better understanding of the topological variations in the epidermal ridge width throughout the life cycle and the factors involved would facilitate the interpretation of the differences between the sexes and different age groups.  相似文献   
882.
We explore the strategies implemented by Research Groups' Leaders while coping with unstable contexts, characterized by incoherence and lack of coordination among different policy discourses and instruments, and scarce resources. We focus on a country where these conditions are present: Colombia. In doing so, we study two cases, one in nanotechnology and another one in biomedical engineering. Interviews, focus groups and workshops allowed us to identify and validate strategies grouped in four popular sayings, proper to local idiosyncrasy, highlighting the role of home institutions and principal investigators in facing such situations with resilience and resourcefulness, and even taking advantage of them. We find that Research Groups' Leaders use strategies such as: adapting, balancing agendas and funding sources, networking, and taking advantage of the support programs available at their home institution to continue functioning. These are setting the ground for a further survey which could pretend some generalization. However, policymakers could consider these findings when defining policy instruments or for assessing their effectiveness or impacts.  相似文献   
883.
The mass protests of December 2001 were a turning point in Argentine politics. However, their effects in the mid- to long term have been less clear. This article argues that the 2001 crisis had two distinct consequences. The first, which was expected and immediate, was the stimulus given to left-wing grassroots organisations. The other, unexpected and deferred, was the revitalisation of right-wing collectives in subsequent years. The article uses a multiple technique approach.  相似文献   
884.
Research on the fulfilment of electoral promises has been particularly fruitful over the past decades. Most of it focused on examining pledge fulfilment at the cabinet level, and little emphasis was placed on the reasons underlying the level of compliance. As a consequence, core factors in explaining pledge fulfilment have not yet been explored. One such factor might be instability in a government's internal functioning. We argue that ministerial instability is relevant for explaining a government's broken promises, and that its importance increases at the junior minister level and among the most salient ministries. Relying on data on the fulfilment of electoral promises and ministerial instability in Portugal between 1995 and 2019, backed by interviews with former ministers and junior ministers, we provide evidence that the fulfilment of electoral promises is significantly influenced by portfolio volatility, particularly at the junior ministerial level and in the most important ministries.  相似文献   
885.
In the last three decades, legal delegation of monetary policy to independent central banks (CBI) has achieved the status of a global norm of good governance. The recent backlash against this independence is an important but understudied trend. Our article analyzes the potential for delegation reversals with a focus on Latin America where CBI was effective in maintaining price stability, but placed important policy constraints on governments. We theorize that, in the shadow of the global norm for CBI, the increasing distance in preferences between the government and the central bank, and the procedural hurdles to change the status quo, explain the intensity of challenges to the delegation contract or the delegated agent. An analysis of the frequency of irregular central bank leadership replacements, and instances of politicization and de-delegation show the plausibility of our argument. We also show that, in Latin America, reforms de-delegating monetary policy have been small, balancing the needs that justified delegation in the first place, but rolling back the most stringent constraints placed on financing the government.  相似文献   
886.
887.
Interior immigration enforcement in the U.S. has rapidly increased over the past two decades, including increased Immigration and Customs Enforcement (ICE) activity and the revival of workplace raids under the Trump administration. We contribute to the body of research that aims to better understand the consequences of immigration enforcement for children in targeted communities, including on their education, health, and socioemotional well-being. We employ a mixed methods research design to investigate the effects of the sweeping April 2018 Morristown, Tennessee immigration raid on children's health and education outcomes. We utilize linked, longitudinal health and education data on children and a quasi-experimental design to analyze the effects of the raid on those residing in close proximity to the raid. Interview data from community members and organizations in the affected area aid in better understanding how the raid unfolded and the mechanisms through which a community trauma such as this might affect children both directly and indirectly. Our results indicate negative effects across multiple education and behavioral health outcomes for children of immigrants living in the area targeted by the raid, including a substantial spike in absences from school in the month of the raid and significant increases in exclusionary disciplinary actions and in diagnoses of substance use disorder, depression, self-harm, suicide attempts or ideation, and sexual abuse in the year following the raid.  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