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   409篇
  免费   23篇
各国政治   14篇
工人农民   28篇
世界政治   69篇
外交国际关系   22篇
法律   137篇
中国政治   3篇
政治理论   159篇
  2023年   9篇
  2022年   3篇
  2021年   7篇
  2020年   16篇
  2019年   10篇
  2018年   18篇
  2017年   28篇
  2016年   16篇
  2015年   4篇
  2014年   12篇
  2013年   54篇
  2012年   11篇
  2011年   9篇
  2010年   12篇
  2009年   11篇
  2008年   18篇
  2007年   20篇
  2006年   11篇
  2005年   17篇
  2004年   16篇
  2003年   10篇
  2002年   8篇
  2001年   12篇
  2000年   10篇
  1999年   3篇
  1998年   6篇
  1997年   4篇
  1996年   3篇
  1995年   4篇
  1994年   3篇
  1993年   4篇
  1992年   3篇
  1990年   4篇
  1988年   7篇
  1987年   4篇
  1986年   3篇
  1985年   5篇
  1984年   3篇
  1983年   5篇
  1982年   4篇
  1981年   4篇
  1979年   2篇
  1977年   3篇
  1975年   1篇
  1974年   1篇
  1973年   3篇
  1970年   2篇
  1969年   1篇
  1968年   2篇
  1967年   2篇
排序方式: 共有432条查询结果,搜索用时 31 毫秒
51.
52.
53.
54.
55.
Several recent studies show European university scientists contributing far more frequently to company-owned patented inventions than they do to patents owned by universities or by the academic scientists themselves. Recognising the significance of this channel for direct commercialisation of European academic research makes it important to understand its response to current Bayh-Dole inspired reforms of university patenting rights. This paper studies the contribution from university scientists to inventions patented by dedicated biotech firms (DBFs) specialised in drug discovery in Denmark and Sweden, which in this respect share a number of structural and historic characteristics. It examines effects of the Danish Law on University Patenting (LUP) effective January 2000, which transferred to the employer university rights to patents on inventions made by Danish university scientists alone or as participants in collaborative research with industry. Sweden so far has left property rights with academic scientists, as they also were in Denmark prior to the reform. Consequently, comparison of Danish and Swedish research collaboration before and after LUP offers a quasi-controlled experiment, bringing out effects on joint research of university IPR reform. In original data on all 3,640 inventor contributions behind the 1,087 patents filed by Danish and Swedish DBFs 1990–2004, Difference-in-Difference regressions uncover notable LUP-induced effects in the form of significant reductions in contributions from Danish domestic academic inventors, combined with a simultaneous substitutive increase of non-Danish academic inventors. A moderate increase in academic inventions channelled into university owned-patents does appear after LUP. But the larger part of the inventive potential of academia, previously mobilised into company-owned patents, seems to have been rendered inactive as a result of the reform. As a likely explanation of these effects the paper suggests that exploratory research, the typical target of joint university-DBF projects in drug discovery, fits poorly into LUP’s requirement for ex ante allocation of IPR. The Pre-LUP convention of IPR allocated to the industrial partner in return for research funding and publication rights to the academic partner may have offered more effective contracting for this type of research. There are indications that LUP, outside the exploratory agenda of drug discovery, offers a more productive framework for inventions requiring less complicated and uncertain post-discovery R&D.
Finn ValentinEmail:
  相似文献   
56.
Abstract: Very little genetic data exist on Haitians, an estimated 1.2 million of whom, not including illegal immigrants, reside in the United States. The absence of genetic data on a population of this size reduces the discriminatory power of criminal and missing‐person DNA databases in the United States and Caribbean. We present a forensic population study that provides the first genetic data set for Haiti. This study uses hypervariable segment one (HVS‐1) mitochondrial DNA (mtDNA) nucleotide sequences from 291 subjects primarily from rural areas of northern and southern Haiti, where admixture would be minimal. Our results showed that the African maternal genetic component of Haitians had slightly higher West‐Central African admixture than African‐Americans and Dominicans, but considerably less than Afro‐Brazilians. These results lay the foundation for further forensic genetics studies in the Haitian population and serve as a model for forensic mtDNA identification of individuals in other isolated or rural communities.  相似文献   
57.
The purpose of this paper is to use criminological theories to explain chronic drunk driving. There is little criminological research explaining recidivist drunk driving with criminological theories. Instead, most researchers posit that repeat drunk driving is explained as a byproduct of substance abuse. Although substance abuse is likely correlated to chronic drunk driving, theoretical explanations need to go further to understand a broader set of social and psychological predictors. Factor analysis and linear regression techniques are used to estimate the relationship between items from two assessment instruments with a number of drunken driving offenses. The sample consists of nearly 3,500 individuals on probation and parole in a Southwestern state. The findings support our contention that criminological frameworks are helpful to understand chronic DUI. We found significant results for volatility, antisocial friends, teenage deviance, and negative views of the law, while controlling for age, gender, marital status, and race. DUIs are a serious problem for the criminal justice system and understanding the individual level correlates of repetitive DUI is crucial for policy development. Further, chronic DUI offers criminologists an opportunity to determine the ability of criminological theories to explain this type of behavior.  相似文献   
58.
59.
Abstract

Literature on organizational turnaround has frequently suggested, but rarely investigated, the possibility that turnaround strategies for failing organizations must be matched to the specific needs of the organization. Building on work related to causes of decline in private sector literature, this study offers a framework for matching strategic interventions to the current state of an organization’s functioning in terms of resources (material and human), coordination (horizontal and vertical), and the environment. Using a panel dataset of New York City schools, we find that two understandings of turnaround that often appear mutually exclusive—that an organization can improve performance by shoring up weaknesses and that an organization should play to its current strengths—can complement each other and may both appropriately describe different types of organizational challenges.  相似文献   
60.
Abstract

Building on studies on the political business cycle, the literature on welfare state retrenchment has argued that governments which cut the welfare state try to avoid blame by implementing painful measures in the beginning of the mandate and expanding benefits as elections approach. In contrast to this linear relationship, this article argues that governments often feel pressured to fulfil (mostly expansionary) campaign promises during the first months in office. Consequently, cutting right away is not what should be expected. Instead, a more nuanced, U-shaped timing trajectory is probable with a period in the beginning characterised by both cuts and fulfilment of expansionary pledges, followed by a period of cutbacks, and finally an expansive phase towards the end of a mandate. This argument is tested on our new original dataset of legislative changes in five European countries – Britain, Denmark, Finland, France and Germany – during the last four decades.  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