全文获取类型
收费全文 | 1987篇 |
免费 | 88篇 |
专业分类
各国政治 | 140篇 |
工人农民 | 68篇 |
世界政治 | 254篇 |
外交国际关系 | 117篇 |
法律 | 848篇 |
中国政治 | 5篇 |
政治理论 | 628篇 |
综合类 | 15篇 |
出版年
2023年 | 12篇 |
2022年 | 15篇 |
2021年 | 16篇 |
2020年 | 34篇 |
2019年 | 44篇 |
2018年 | 58篇 |
2017年 | 65篇 |
2016年 | 75篇 |
2015年 | 59篇 |
2014年 | 60篇 |
2013年 | 389篇 |
2012年 | 58篇 |
2011年 | 55篇 |
2010年 | 70篇 |
2009年 | 55篇 |
2008年 | 64篇 |
2007年 | 88篇 |
2006年 | 70篇 |
2005年 | 65篇 |
2004年 | 77篇 |
2003年 | 56篇 |
2002年 | 45篇 |
2001年 | 34篇 |
2000年 | 40篇 |
1999年 | 29篇 |
1998年 | 24篇 |
1997年 | 28篇 |
1996年 | 23篇 |
1995年 | 24篇 |
1994年 | 26篇 |
1993年 | 17篇 |
1992年 | 18篇 |
1991年 | 19篇 |
1990年 | 23篇 |
1989年 | 15篇 |
1988年 | 17篇 |
1987年 | 21篇 |
1986年 | 18篇 |
1985年 | 11篇 |
1984年 | 10篇 |
1983年 | 10篇 |
1982年 | 20篇 |
1981年 | 16篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1975年 | 7篇 |
1974年 | 9篇 |
1971年 | 6篇 |
1970年 | 9篇 |
1969年 | 9篇 |
排序方式: 共有2075条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
John K. Mullen Martin Williams Ronald L. Moomaw 《Journal of policy analysis and management》1996,15(1):51-67
This study focuses on the role of public capital stock in contributing to interstate differences in productive efficiency in manufacturing. Our motivation is to assess the role of public capital as a source of persistent regional variations in efficiency, and thus determine if public infrastructure policies might reasonably be expected to alter the competitive environment of a state's manufacturing sector. We use a stochastic frontier production function model, explicitly incorporating infrastructure capital, to examine the relative performance of the aggregate manufacturing sector across states and over time. We calculate an index of productive efficiency and estimate the determinants of statewide variations in it. These results show that variations in per capita infrastructure stocks significantly affect manufacturing efficiency. Considering the behavior of public capital as both a direct and an indirect input furthers our understanding of the role of infrastructure and its implications for regional economic development policies. 相似文献
56.
Accurate age estimates of immature necrophagous insects associated with a human or animal body can provide evidence of how long the body has been dead. These estimates are based on species-specific details of the insects’ aging processes, and therefore require accurate species identification and developmental stage estimation. Many professionals who produce or use identified organisms as forensic evidence have little training in taxonomy or metrology, and appreciate the availability of formalized principles and standards for biological identification. Taxonomic identifications are usually most readily and economically made using categorical and qualitative morphological characters, but it may be necessary to use less convenient and potentially more ambiguous characters that are continuous and quantitative if two candidate species are closely related, or if identifying developmental stages within a species. Characters should be selected by criteria such as taxonomic specificity and metrological repeatability and relative error. We propose such a hierarchical framework, critique various measurements of immature insects, and suggest some standard approaches to determine the reliability of organismal identifications and measurements in estimating postmortem intervals. Relevant criteria for good characters include high repeatability (including low scope for ambiguity or parallax effects), pronounced discreteness, and small relative error in measurements. These same principles apply to individuation of unique objects in general.
Key points
- Metrological rigour can increase in forensic entomology by selecting measurements based on their metrological qualities.
- Selection of high-quality features for morphological identification of organisms should consider these criteria: (1) pronounced discreteness of features (minimising group overlap or maximizing interval); (2) high repeatability of assessment (such as symmetrical width rather than asymmetrical length); (3) small relative error in measurement (selecting the physically largest continuous rigid feature for measurement).
- These metrological principles also apply to individuation of unique objects in general.
57.
Edward Newman 《Global Society》2007,21(3):429-447
If relative cohesion exists in the international structure, if forms of action are better organised, if the international organisation is able to resist the assaults of adverse forces from all quarters, this is due to the discreet and persevering work of the international civil servant. He embodies the institutionalisation of international cooperation. 1 相似文献
58.
Which European Union actors are most powerful in the governance of the euro crisis? The euro crisis has reignited the classic debate between intergovernmentalists, who tend to stress the coercive power of dominant member states in the European Council, and supranationalists, who maintain that through the use of institutional power, the Commission, and the European Central Bank turned out the “winners” of the crisis. This article argues that euro crisis governance is best understood not just in terms of one form of power but instead as evolving through different constellations of coercive, institutional, and ideational power that favored different EU actors over the course of the crisis, from the initial fast‐burning phase (2010–2012), where the coercive and ideational power of Northern European member states in the European Council was strongest, to the slow‐burning phase (2012–2016), when greater influence was afforded supranational actors through the use of ideational and institutional power. 相似文献
59.
60.
Edward Newman 《Global Society》2018,32(2):198-209
This article explores the prospects for the EU’s role as a global leader in a transitional international order, based on the assumption that multilateral principles will remain at the heart of global governance. It focuses in particular upon the EU’s 2016 Global Strategy in the context of three principal trends and challenges for global governance: political and normative challenges, legitimacy challenges, and systemic challenges. It argues that the prospects for the EU’s global role are limited as long as the EU remains committed to traditional forms and norms of global governance, because these are increasingly out of touch with the emerging international order, and the nature of contemporary collective action challenges. 相似文献