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   1948篇
  免费   74篇
  2023年   14篇
  2020年   28篇
  2019年   50篇
  2018年   56篇
  2017年   84篇
  2016年   72篇
  2015年   40篇
  2014年   39篇
  2013年   720篇
  2012年   44篇
  2011年   52篇
  2010年   45篇
  2009年   47篇
  2008年   40篇
  2007年   32篇
  2006年   27篇
  2005年   16篇
  2004年   35篇
  2003年   30篇
  2002年   34篇
  2001年   26篇
  2000年   17篇
  1999年   21篇
  1998年   17篇
  1997年   15篇
  1996年   11篇
  1995年   11篇
  1994年   11篇
  1993年   24篇
  1992年   11篇
  1991年   17篇
  1990年   14篇
  1989年   13篇
  1988年   13篇
  1987年   14篇
  1986年   14篇
  1985年   15篇
  1984年   21篇
  1983年   12篇
  1982年   13篇
  1981年   18篇
  1980年   22篇
  1979年   13篇
  1978年   18篇
  1977年   22篇
  1976年   32篇
  1975年   13篇
  1973年   11篇
  1971年   9篇
  1970年   8篇
排序方式: 共有2022条查询结果,搜索用时 15 毫秒
101.
Ancient human migrations provide the critical genetic background to historical and contemporary human demographic patterns. However, our ability to infer past human migration events, especially those that occurred over rapid timescales, is often limited. A key example is the peopling of Polynesia, where the timing is relatively well defined, but the exact routes taken during the final stages and the source populations are not. Here, we discuss the technical limitations of current methods for inferring rapid human migration events, using the final stages of Polynesian migration as an example. We also introduce a promising new proxy method to infer human migrations—patterns of bacterial evolution within ancient dental calculus (calcified plaque). While we focus on Polynesia, this method should be applicable to other past migrations, enhancing our understanding of human prehistory and revealing the crucial events that shaped it.  相似文献   
102.
This article shows that, in the study of immigrant integration policy in the U.S. states, it is critical to report data and coding decisions for individual laws. This analysis uses an updated and public database of law‐level decisions, which includes 2,703 legislative actions recorded by the National Conference of State Legislatures from 2005 to 2016. These data are used to estimate models of aggregate state policy activity in a variety of ways: as a single continuum of policy balance versus separate models of welcoming and hostile, lumping all policy subareas together versus analyzing a specific subarea, and lumping all years together in one cross section versus panel analysis. The results in these models differ enough to indicate that reporting codes for individual‐level laws is absolutely essential so that each researcher easily can construct the measure that fits his or her theoretical framework best.  相似文献   
103.
The jurist A. V. Dicey’s study of the Law of the Constitution (1885) has been since its publication the dominant analysis of the British constitution and the source of orthodoxy on such subjects as parliamentary sovereignty and the rule of law. This canonical status has obscured the originality of Dicey’s ideas in the history of legal and political thought. Dicey reworked the traditional idea of sovereignty into two separate concepts – legal and political sovereignty – in order to square the common law notion of the sovereignty of parliament with the democratic idea of the sovereignty of the people. He forged a new concept – ‘the rule of law’ – to explain the legal basis of liberty in common law countries in a manner that was both Benthamite and constitutionalist. Finally, he provided a democratic and anti-federalist rationale for maintaining the Union of Great Britain and Ireland. This majoritarian, centralist and utilitarian constitutionalism has been one of the most enduring products of Victorian scholarship. This article seeks to recover it in its original context and, in so doing, to show the value of reintegrating legal thought into the mainstream of modern British history and the history of political thought.  相似文献   
104.
Marine resources were an integral and consistent component of subsistence strategies employed in south‐eastern Arabia throughout late prehistory. Of particular interest is the movement of these resources from the coast to interior sites and the implications of this movement for transhumance and trade in the region during this period. Marine species were frequently identified in the faunal assemblage from the inland site of Saruq al‐Hadid, dating from the Bronze Age to Early Iron Age (c.2000–c.800 BCE). This included marine fish species, along with two cormorant species (Phalacrocorax sp.) and several fragments of dugong (Dugong dugon). Twenty‐seven families of marine shell were also identified in the remains recovered from the site. The presence of these remains at this inland site demonstrates that resources were frequently moved from the coast to the interior throughout Saruq al‐Hadid’s occupation, indicative of their enduring significance in subsistence strategies employed at the site. This paper presents the results of zooarchaeological analysis of these remains and discusses the significance of their presence at Saruq al‐Hadid, with reference to subsistence, craft production and intra‐regional exchange during the Bronze and Iron Ages.  相似文献   
105.
106.
107.
Welfare policy is multidimensional because of the political compromises, competing goals, and federalist structure underpinning it. This complexity has hindered measurement and, therefore, the comparability of research on race and welfare policy. This paper describes a measurement strategy that is transparent, replicable, and attuned to matching the assumptions of statistical models to the policy process. We demonstrate that this strategy leads to more nuanced conclusions regarding the relationship between minority caseloads and the flexibility of state welfare policies. The strategy and recommendations are adaptable to research agendas that scholars bring to the comparative study of welfare in the U.S. states, countries, or other units—and to other complex policies enacted in federal systems.  相似文献   
108.
109.
110.
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