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   8561篇
  免费   286篇
  2020年   101篇
  2019年   143篇
  2018年   431篇
  2017年   384篇
  2016年   451篇
  2015年   166篇
  2014年   155篇
  2013年   2097篇
  2012年   236篇
  2011年   375篇
  2010年   408篇
  2009年   255篇
  2008年   267篇
  2007年   302篇
  2006年   192篇
  2005年   130篇
  2004年   101篇
  2003年   93篇
  2002年   98篇
  2001年   110篇
  2000年   79篇
  1999年   95篇
  1998年   63篇
  1997年   56篇
  1996年   70篇
  1995年   73篇
  1994年   72篇
  1993年   80篇
  1992年   71篇
  1991年   59篇
  1990年   52篇
  1989年   66篇
  1988年   57篇
  1987年   65篇
  1986年   64篇
  1985年   76篇
  1984年   65篇
  1983年   95篇
  1982年   70篇
  1981年   72篇
  1980年   68篇
  1979年   67篇
  1978年   71篇
  1977年   63篇
  1976年   72篇
  1975年   66篇
  1974年   53篇
  1973年   54篇
  1972年   55篇
  1970年   44篇
排序方式: 共有8847条查询结果,搜索用时 15 毫秒
121.
122.
123.
124.
"This paper questions the plausibility of the assumption of interregional equilibrium in recent research into migration and the valuation of amenities in the United States. It is shown that it is difficult to develop a satisfactory explanation for continuing net migration which is compatible with the equilibrium assumption, and that recent relevant research generally fails to support the idea that the U.S. economy is in equilibrium. The association of higher rent levels with in-migration is explained as a short-run phenomenon. If the spatial economy is in disequilibrium, then the valuations of amenities assuming equilibrium will be biased, being probably too low in areas of net in-migration and too high in areas of net out-migration."  相似文献   
125.
126.
The chemical and mineralogical characterization of seven ceramic fragments produced within Tiwanaku state (c.500–1000 ce ) is reported. The instrumental techniques used included X‐ray elemental and mineralogical chemical analysis, Raman spectroscopy, and scanning and light microscopy. The results indicate there are several clay types, although they show similarities, such as the use of a plant‐based temper. The red colour of the decoration is hematite, and manganese oxides such as jacobsite are present in the black. The white colour is a mixture of gypsum and clay, and the orange is a mixture of hematite and clay. The use of colours, the quality of the clays and the temperatures reached during pottery firing point to expertise in ceramic production and to complex decision‐making processes. The multi‐elemental archaeometric approach documented here could become an important tool to shed a light on ancient ceramic technology and the internal variance of Tiwanaku pottery.  相似文献   
127.
In recent decades, there has been a noticeable increase in the use of quantitative techniques in the study of ethnicity and nationalism, without, however, a sufficient amount of reflection on how these techniques have contributed to our understanding of ethnic and national identities. As such, in this exchange three sets of authors answer questions about the degree to which it is possible to use quantitative data to measure ethnic and national identities, which types of methods are most suitable in measuring these identities and what the major research findings of this quantitative research are that were not possible using qualitative approaches.  相似文献   
128.
Tel Megiddo is a major type-site for the Middle Bronze in the Levant. During this period a new burial custom appeared in which the dead were interred beneath occupied houses. This tradition is well attested in Area K at the site. Area H, near the palatial complex, revealed a monumental masonry-constructed chamber tomb. This article presents the results of residue analysis conducted on ceramic vessels placed in these tombs as burial offerings. Hundreds of intramural Middle Bronze tombs with ceramic offerings were excavated in the Levant, but this is the first time the content of the vessels is revealed.  相似文献   
129.
This study aims to provide a comprehensive examination of the evolution of regional science, a scholarly domain in the social sciences that applies analytical and quantitative approaches and methods to understand and address urban, rural, or regional problems. We conducted a bibliometric analysis of 8509 articles published in six regional science flagship journals (including the Journal of Regional Science, Annals of Regional Science, Regional Science and Urban Economics, Papers in Regional Science, Regional Science Policy and Practice, and International Regional Science Review) from 1958 to 2021. The analysis presents an objective data-driven and unprecedented visualization of the field's intellectual, social, and conceptual structure and trends from the beginning to the present. It also provides a rich portrayal of the epistemology of regional science and illuminates matters related to regional science education and training. We find that regional science has moved well beyond its origins, shifting away from a heavy focus on theory and abstraction to modeling/simulation, empirical analysis, and policy research. We also find that there has been increasing attention to “people” in regions and the spatial characteristics of social problems, and some important shifts in the regional science community itself, particularly in terms of patterns of collaboration and the geography of scholarship. The findings of this paper provide implications for future directions of research and education for regional science.  相似文献   
130.
What might anthropology offer to our understanding of mutualistic relations? In making sense of these interspecies interactions, which, despite some costs, are ultimately beneficial to each partner species, zoological approaches operate at the level of populations on an adaptive scale. Anthropologists bring focus on individual actors and their subjective experiences within far more condensed temporospatial ethnographic timescales. This guest editorial brings a multispecies anthropological approach into dialogue with zoological understandings of mutualism. It examines the practical and theoretical potential of mutuality to make sense of relations of domestication. Materialistic profit and market-oriented forms of engagement in the domestic sphere are often detrimental to more-than-human communities. The persistence of different kinds of mutual co-existences, as shown in different forms of care of orphaned animals in Mongolia, Pakistan and Australia, offers an alternative and perhaps more hopeful model of more-than-human engagement in the Anthropocene.  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