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   484篇
  免费   20篇
  2023年   3篇
  2021年   1篇
  2020年   11篇
  2019年   19篇
  2018年   23篇
  2017年   32篇
  2016年   19篇
  2015年   16篇
  2014年   24篇
  2013年   115篇
  2012年   20篇
  2011年   16篇
  2010年   11篇
  2009年   16篇
  2008年   14篇
  2007年   15篇
  2006年   12篇
  2005年   6篇
  2004年   6篇
  2003年   5篇
  2002年   9篇
  2001年   8篇
  2000年   3篇
  1999年   5篇
  1998年   6篇
  1997年   8篇
  1996年   2篇
  1995年   3篇
  1994年   2篇
  1993年   6篇
  1992年   4篇
  1991年   2篇
  1990年   6篇
  1989年   2篇
  1988年   2篇
  1987年   5篇
  1986年   4篇
  1985年   6篇
  1984年   8篇
  1983年   3篇
  1982年   2篇
  1981年   5篇
  1980年   4篇
  1979年   2篇
  1978年   3篇
  1976年   3篇
  1975年   2篇
  1974年   2篇
  1973年   1篇
  1967年   1篇
排序方式: 共有504条查询结果,搜索用时 15 毫秒
31.
32.
Harvesting different species as foods or raw materials calls for differing skills depending on the species being harvested and the circumstances under which they are being taken. In some situations and for some species, the tactics used are mainly behavioral—that is, people adjust, or adapt, their own actions to fit the behavior and circumstances of the species they are taking. Under other circumstances and for other species, the skills and tactics used may call for greater environmental preparation or manipulation. Therefore, instead of trying to distinguish people today and in the past as either foragers or farmers, it makes sense to define human subsistence behavior as an interactive matrix of species and harvesting tactics, that is, as a provisions spreadsheet.  相似文献   
33.
ABSTRACT We investigate the relationship between income tax rate variation and internal migration for the unique case of Switzerland, whose system of determining tax rates primarily at the community level results in enough variation to permit analysis of their influence on migration. Specifically, using Swiss census data, we analyze migratory responses to tax rate variations for various groups defined by age, education, and nationality/residence permit. The results suggest that young Swiss college graduates are most sensitive to tax rate differences, but the estimated effects are not large enough to offset the revenue‐increasing effect of a rise in tax rate. The migratory responses of foreigners and other age‐education groups are even smaller, and reverse causation seems negligible.  相似文献   
34.
This article advances the existing literature on British imperial aeronautics by explaining how Lord John Montagu’s extensive collaboration with military and government officials during the first decades of powered flight expanded the global distribution of the air forces and anticipated their important later role in facilitating international communication and security. In reconsidering problems of conquest and governance through an aeronautical perspective, Montagu strengthened critical junctures between British civil and military affairs, while his innovative employment of the new technology also complicated divisions between the metropolis and periphery in ways that would intensify the destructiveness of modern warfare across the planet.  相似文献   
35.
36.
Architectural reconstructions of plankhouses are central to the study of household and community organization on the Northwest Coast of North America. However, the sample of substantially excavated houses is constrained by their size, stratigraphic complexity, and typically limited surface expression. We present the results of a magnetic gradiometry survey of the Dionisio Point site (DgRv-003) village, occupied ca. a.d. 500–700 on the coast of British Columbia, Canada. Survey of four house platforms reveals patterning of magnetic anomalies consistent with the structure of shed-roof houses, a design recorded ethnographically and identified archaeologically at the site. These results suggest a consistent pattern of spatial and, potentially, social organization of the households. The similarity of patterns suggests that magnetometry may be useful for guiding plankhouse excavations elsewhere on the Northwest Coast, providing a means for expanding our knowledge of houses without relying solely on traditional excavation methods.  相似文献   
37.
38.
Henry David Thoreau’s Yankee in Canada is easily overlooked. Because it is so selective in its depiction of life in the St. Lawrence River valley, historians of mid-nineteenth-century Canada have shown little interest in Thoreau’s first-hand account. To American readers, it offers little of the characteristic Thoreau found in Walden and Resistance to Civil Government. Yet, it is highly significant as an expression of national self-definition. Thoreau borrowed themes at least as old as the American Revolution when noting the pernicious rule of Catholic and British power in Canada. He set out to expose the promise of republican values by emphasizing the contrast between these and the poor and morally stunted life under Old World institutions. His work must therefore be interpreted as a call to his audience to commit more deeply than ever to the ideals that animated the Great Republic’s founding moment. It must also stand as a civic interpretation of American nationality at a time when this perspective was waning. Before long, Old World peoples would be racialized and the ideological embrace of the republican values advanced by Thoreau would no longer suffice in making American citizens.  相似文献   
39.
40.
This paper addresses the motivations underlying migration decision-making in the case of young university graduates returning to their rural home region in Switzerland. Empirical results show the joint role of social ties, living environment, and job opportunities, although the weight given to each of these factors varies between graduates. Some strategies used by the graduates to cope with a limited labour market are furthermore identified. I argue that internal migrations are far from being the sole consequence of labour market conditions and that a greater appreciation of non-economic issues is needed.  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