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   394篇
  免费   12篇
各国政治   23篇
工人农民   9篇
世界政治   28篇
外交国际关系   29篇
法律   210篇
中国政治   1篇
政治理论   104篇
综合类   2篇
  2023年   3篇
  2022年   1篇
  2021年   2篇
  2020年   5篇
  2019年   7篇
  2018年   20篇
  2017年   14篇
  2016年   12篇
  2015年   10篇
  2014年   14篇
  2013年   53篇
  2012年   16篇
  2011年   15篇
  2010年   16篇
  2009年   16篇
  2008年   18篇
  2007年   15篇
  2006年   16篇
  2005年   17篇
  2004年   17篇
  2003年   17篇
  2002年   9篇
  2001年   8篇
  2000年   18篇
  1999年   4篇
  1998年   4篇
  1997年   5篇
  1996年   8篇
  1995年   3篇
  1994年   3篇
  1993年   4篇
  1992年   2篇
  1991年   2篇
  1990年   4篇
  1989年   4篇
  1987年   2篇
  1986年   1篇
  1985年   3篇
  1984年   3篇
  1981年   2篇
  1980年   3篇
  1979年   3篇
  1977年   1篇
  1974年   2篇
  1973年   1篇
  1970年   2篇
  1963年   1篇
排序方式: 共有406条查询结果,搜索用时 0 毫秒
151.
Abstract

A basic trade-off in military cooperation exists: States must respond to the dominant ally’s demands and act as a reliable partner while simultaneously making a decision that is acceptable to domestic audiences. We argue that compensatory burden-sharing strategies are imperfect but dependable solutions to manage foreign policy decisions at the domestic and alliance levels. Our theoretical expectations are tested using the US-Japan and US-Republic of Korea alliances and, in particular, the contribution of each country to the war in Afghanistan. We find that foreign aid commitments to third parties are made as a form of compensation when alliance expectations are substantial, but the secondary ally's ability to contribute militarily is highly constrained. Foreign aid has therefore served as an alliance management tool.  相似文献   
152.
153.
Recent work on coalition governance claims that government parties use the chairs of parliamentary committees to ‘shadow’ ministers and thus to monitor coalition partners. This argument rests on the assumption that committee chairs enjoy special powers to extract information from ministries and to affect policy-making in committee. To test this assumption, the paper develops the first comparative measure of committee chair powers in fifteen Western European democracies. The analysis shows that most committee chairs have very limited formal powers and that the share of shadowing chairs does not increase when committee chairs are more powerful. Both findings cast doubt on the interpretation of shadow chairs as a monitoring device. We sketch an alternative explanation according to which coalition parties employ the shadowing strategy in order to increase public visibility and to counteract issue ownership by the minister’s party.  相似文献   
154.
The 4977-bp deletion in human mitochondrial DNA (mtDNA) is known to accumulate in various tissues with age. Since this deletion in mtDNA correlates closest with age in muscle tissue, iliopsoas muscle tissue was taken at autopsy from 50 persons aged 24-97 years to determine whether age at death can be estimated based on the amount of the 4977-bp deletion in skeletal muscle. Total DNA (nuclear and mtDNA) was extracted from 100 mg tissue and the 4977-bp deletion quantified using a kinetic polymerase chain reaction (PCR) followed by visualization of the products on silver stained polyacrylamide gels. The amount of the 4977-bp deletion of mtDNA ranged from 0.00049% to 0.14% depending on age, with a correlation coefficient of r = 0.83 (P = 0.0001). In forensic practice this method can aid in the estimation of age at death with a relatively wide confidence interval, thus enabling a discrimination between young and elderly persons in the identification of human remains based solely on skeletal muscle.  相似文献   
155.
Die Zerschneidung und Verinselung der Landschaft durch Infrastrukturanlagen wie Stra?en und Bahnlinien ist neben der direkten Zerst?rung und mechanischen Sch?digung des Lebensraumes eine der Hauptursachen für den Arten- und Lebensraumschwund. Die Bundesregierung hat sich deshalb in ihrer Biodiversit?tsstrategie zum Ziel gesetzt, bis zum Jahr 2020 die ?kologische Durchl?ssigkeit von zerschnittenen R?umen und bestehender Infrastruktur zu erreichen. Sie erarbeitet dafür derzeit ein Bundesprogramm zur Wiedervernetzung. Der vorliegende Beitrag untersucht die M?glichkeiten zur Berücksichtigung der Landschaftszerschneidung in der Bundesverkehrswegeplanung sowie die Konzipierung von Wiedervernetzungsma?nahmen aus rechtlicher und planerischer Sicht.  相似文献   
156.
Pressure is mounting for states to become better at integrating its environmental policies into sector policy, a challenge often referred to as environmental policy integration (EPI). Policy research on EPI has grown to become a distinct and substantial field of study at the national and EU levels, where political commitment and interest in the topic have been large. In the study of international regimes, EPI analytical concepts have so far not been applied although the EPI quest is at least as important and critical at this level. This special issue addresses this gap, by combining these two sets of literature and examining various aspects of EPI in international regimes, its manifestations and its challenges. This introductory paper introduces key conceptual discussions underlying the development of this special issue, distils and discusses some of the key findings and messages from the four ensuing research articles and presents directions for future research. It finds that many EPI challenges and institutional barriers are strongly accentuated at international levels of governance, but also that similarities with the national level suggest that closer interactions between the two fields of study are warranted. At both levels, the EPI “game” is full of inherent tensions and goal conflicts, institutional constraints abound, and cognitive interactions and learning processes appear as key mechanisms to advance EPI. Suggestions for how to enhance EPI in international regimes are still tentative, and analysis beyond international relations and regime theory is needed to capture potential institutional innovations for advancing EPI.  相似文献   
157.
Soil DNA profiling has potential as a forensic tool to establish a link between soil collected at a crime scene and soil recovered from a suspect. However, a quantitative measure is needed to investigate the spatial/temporal variability across multiple scales prior to their application in forensic science. In this study, soil DNA profiles across Miami‐Dade, FL, were generated using length heterogeneity PCR to target four taxa. The objectives of this study were to (i) assess the biogeographical patterns of soils to determine whether soil biota is spatially correlated with geographic location and (ii) evaluate five machine learning algorithms for their predictive ability to recognize biotic patterns which could accurately classify soils at different spatial scales regardless of seasonal collection. Results demonstrate that soil communities have unique patterns and are spatially autocorrelated. Bioinformatic algorithms could accurately classify soils across all scales with Random Forest significantly outperforming all other algorithms regardless of spatial level.  相似文献   
158.
Efforts to set standards for artificial intelligence (AI) reveal striking patterns: technical experts hailing from geopolitical rivals, such as the United States and China, readily collaborate on technical AI standards within transnational standard-setting organizations, whereas governments are much less willing to collaborate on global ethical AI standards within international organizations. Whether competition or cooperation prevails can be explained by three variables: the actors that make up the membership of the standard-setting organization, the issues on which the organization's standard-setting efforts focus, and the “games” actors play when trying to set standards within a particular type of organization. A preliminary empirical analysis provides support for the contention that actors, issues, and games affect the prospects for cooperation on global AI standards. It matters because shared standards are vital for achieving truly global frameworks for the governance of AI. Such global frameworks, in turn, lower transaction costs and the probability that the world will witness the emergence of AI systems that threaten human rights and fundamental freedoms.  相似文献   
159.
Since their introduction in 1932, Likert and other continuous, independent rating scales have become the de facto toolset for survey research. Scholars have raised significant reliability and validity problems with these types of scales, and alternative methods for capturing perceptions and preferences have gained traction within specific domains. In this paper, we evaluate a new, broadly applicable approach to opinion measurement based on quadratic voting (QV), a method in which respondents express preferences by ‘buying’ votes for options using a fixed budget from which they pay quadratic prices for votes. Comparable QV-based and Likert-based survey instruments designed by Collective Decision Engines LLC were evaluated experimentally by assigning potential respondents randomly to one or the other method. Using a host of metrics, including respondent engagement and process-based metrics, we provide some initial evidence that the QV-based instrument provides a clearer measure of the preferences of the most intensely motivated respondents than the Likert-based instrument does. We consider the implications for survey satisficing, a key threat to the continued value of survey research, and discuss the mechanisms by which QV differentiates itself from Likert-based scales, thus establishing QV as a promising alternative survey tool for political and commercial research. We also explore key design issues within QV-based surveys to extend these promising results.  相似文献   
160.
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