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   914篇
  免费   22篇
各国政治   22篇
工人农民   93篇
世界政治   77篇
外交国际关系   28篇
法律   447篇
中国政治   17篇
政治理论   233篇
综合类   19篇
  2022年   8篇
  2021年   3篇
  2020年   15篇
  2019年   15篇
  2018年   20篇
  2017年   18篇
  2016年   27篇
  2015年   20篇
  2014年   20篇
  2013年   127篇
  2012年   35篇
  2011年   28篇
  2010年   26篇
  2009年   12篇
  2008年   34篇
  2007年   38篇
  2006年   37篇
  2005年   44篇
  2004年   37篇
  2003年   33篇
  2002年   37篇
  2001年   19篇
  2000年   21篇
  1999年   13篇
  1998年   15篇
  1997年   6篇
  1996年   6篇
  1995年   10篇
  1994年   14篇
  1993年   10篇
  1992年   13篇
  1991年   15篇
  1990年   14篇
  1989年   9篇
  1988年   21篇
  1987年   13篇
  1986年   13篇
  1985年   11篇
  1984年   5篇
  1983年   7篇
  1982年   8篇
  1981年   6篇
  1980年   8篇
  1979年   7篇
  1978年   6篇
  1977年   4篇
  1976年   7篇
  1975年   8篇
  1974年   3篇
  1973年   2篇
排序方式: 共有936条查询结果,搜索用时 15 毫秒
911.
It remains unclear whether the Abu Sayyaf Group (ASG) is a well-structured terror organization that poses a strategic threat, or a loosely organized collection of bandits that poses limited risk. Efforts to assess the nature of the organization are complicated by flaws in existing datasets on Violent Non-State Actors (VNSAs). ASG's role in kidnappings serves as a test-case to estimate incongruities among four major datasets on VNSAs. Original data collected at the agent level provides an additional point of comparison and also serves to test the efficacy of ASG's knowledge-dissemination structures, which are key in determining VNSAs' strategic capacities.  相似文献   
912.
913.
Operation Condor was a transnational network of organized state-sponsored terrorism that targeted Communist “subversion.” It was operational in the second half of the 1970s. The key member countries were Chile, Argentina, Uruguay, Bolivia, Paraguay, and Brazil (Peru and Equador joined the network later on, with a more marginal role). Based on declassified documents from the United Nations High Commissioner for Refugees in Geneva and on U.S. documents of various origin, this article will assess the development of the Condor network and the U.S. reaction to such manifest acts of state-sponsored terrorism.  相似文献   
914.
Theoretical and empirical work on collaboration has proliferated in the last decade. The authors’ 2006 article on designing and implementing cross‐sector collaborations was a part of, and helped stimulate, this growth. This article reviews the authors’ and others’ important theoretical frameworks from the last decade, along with key empirical results. Research indicates how complicated and challenging collaboration can be, even though it may be needed now more than ever. The article concludes with a summary of areas in which scholarship offers reasonably settled conclusions and an extensive list of recommendations for future research. The authors favor research that takes a dynamic, multilevel systems view and makes use of both quantitative and qualitative methods, especially using longitudinal comparative case studies.  相似文献   
915.
Robyn Eckersley: Environmentalism and Political Theory: Toward an Ecocentric Approach. Albany: State University of New York Press, 1992.

Arne Naess: Ecology, Community and Lifestyle. Translated and revised by David Rothenberg. Cambridge: Cambridge University Press, 1989.

M. Annette Jaimes, ed.: The State of Native America: Genocide, Colonization, and Resistance. Race and Resistance Series, Boston, South End Press, 1992.

Alexander Wilson: The Culture of Nature: North American Landscape from Disney to the Exxon Valdez. Cambridge, MA: Basil Blackwell, 1992.  相似文献   
916.
Abstract

Grigsby and Bourassa claim that the major problems with the housing voucher program are that most families with affordability problems are not served and that housing assistance is not part of the federal safety net. They propose replacing the program with a housing entitlement for most very low‐income renters, with eligibility linked to receipt of safety‐net benefits. Resources to serve additional families would be generated in part by changes like those found in the Department of Housing and Urban Development's recent block grant proposals.

The Grigsby‐Bourassa proposal lacks a clear assessment of likely costs. Also, there is a risk that the means the authors propose will be heard, but that their call for expansion will not. Finally, their proposal does not intersect with other ideas to modify a basically successful program to better achieve its goals, and questions about rental markets and family and landlord behavior also must be answered.  相似文献   
917.
Homeowners associations (HOAs) are private nonprofit corporations that regulate, “tax,” and provide urban services to growing numbers of U.S. residents. As such, HOAs may affect cities' public service delivery. Interviews with department heads in Phoenix, Arizona reveal how enclaves of private services influence the city's planning and provision of public services. The findings suggest that HOAs do not substitute private for public services in Phoenix. Instead, qualitative differences in the services themselves (particularly concerning their purpose and scale) and in the legal powers of their providers create a more nuanced pattern of public-private service delivery.  相似文献   
918.
This paper reports on a Q methodological study of stakeholder perceptions of rural local government management of natural resources. Data analysis of the Q sorts revealed that there are five distinct stakeholder perspectives relating to rural local government and natural resource management. In terms of natural resource management at the local level rural stakeholders perceive local government as an unwilling participant, an inconsequential participant, as a problematic participant, as a potential participant, and, most positively, a participatory partner. The paper describes each of these five stakeholder perspectives in detail before examining the implications of these findings for greater natural resource management at the local level in non-metropolitan Australia.  相似文献   
919.
Indian snakeroot (Rauvolfia serpentina) is a valuable forest product, root extracts of which are used as an antihypertensive drug. Increasing demand led to overharvesting in the wild. Control of international trade is hampered by the inability to identify root samples to the species level. We therefore evaluated the potential of molecular identification by searching for species‐specific DNA polymorphisms. We found two species‐specific indels in the rps16 intron region for R. serpentina. Our DNA barcoding method was tested for its specificity, reproducibility, sensitivity and stability. We included samples of various tissues and ages, which had been treated differently for preservation. DNA extractions were tested in a range of amplification settings and dilutions. Species‐specific rps16 intron sequences were obtained from 79 herbarium accessions and one confiscated root, encompassing 39 different species. Our results demonstrate that molecular analysis provides new perspectives for forensic identification of Indian snakeroot.  相似文献   
920.
Slimming cactus (Hoodia), found only in southwestern Africa, is a well‐known herbal product for losing weight. Consequently, Hoodia extracts are sought‐after worldwide despite a CITES Appendix II status. The failure to eradicate illegal trade is due to problems with detecting and identifying Hoodia using morphological and chemical characters. Our aim was to evaluate the potential of molecular identification of Hoodia based on DNA barcoding. Screening of nrITS1 and psbAtrnH DNA sequences from 26 accessions of Ceropegieae resulted in successful identification, while conventional chemical profiling using DLI‐MS led to inaccurate detection and identification of Hoodia. The presence of Hoodia in herbal products was also successfully established using DNA sequences. A validation procedure of our DNA barcoding protocol demonstrated its robustness to changes in PCR conditions. We conclude that DNA barcoding is an effective tool for Hoodia detection and identification which can contribute to preventing illegal trade.  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