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   3660篇
  免费   113篇
  2020年   46篇
  2019年   55篇
  2018年   340篇
  2017年   247篇
  2016年   325篇
  2015年   71篇
  2014年   68篇
  2013年   624篇
  2012年   107篇
  2011年   225篇
  2010年   241篇
  2009年   103篇
  2008年   125篇
  2007年   122篇
  2006年   51篇
  2005年   65篇
  2004年   32篇
  2003年   27篇
  2002年   36篇
  2001年   38篇
  2000年   29篇
  1999年   30篇
  1998年   21篇
  1997年   28篇
  1996年   30篇
  1995年   28篇
  1994年   21篇
  1993年   29篇
  1992年   26篇
  1991年   24篇
  1990年   12篇
  1989年   20篇
  1988年   17篇
  1987年   23篇
  1986年   23篇
  1985年   29篇
  1984年   34篇
  1983年   25篇
  1982年   30篇
  1981年   20篇
  1980年   33篇
  1979年   26篇
  1978年   21篇
  1977年   18篇
  1976年   18篇
  1975年   13篇
  1973年   16篇
  1972年   18篇
  1971年   17篇
  1967年   17篇
排序方式: 共有3773条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
Analyses of archaeological faunal assemblages often require the use of varied quantitative techniques for reconstructing aspects of the harvested populations. This is particularly important with the increasing use of zooarchaeological data outside of the realm of traditional archaeological inquiry. Detailed size estimations of archaeological faunal specimens can be used to distinguish between the remains of individual animals, aiding in the reconstruction of minimum number calculations. Statistical regression provides a particularly useful technique for generating size estimations which may then be used to calculate such modified MNI values. This paper outlines a methodology for utilising regression estimated sizes in MNI calculations, and tests the methodology in the context of a case study involving fish remains from Aleutian Islands archaeological sites. The use of this methodology to generate modified MNI values results in consistent increases over values calculated using traditional MNI approaches. Such an approach, while more costly in terms of required effort, is felt to be preferable to traditional approaches in contexts where detailed size estimations are usefully calculated to answer other research questions. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   
995.
996.
Using findings from a federally mandated statewide study of homelessness in the state of Iowa, this paper presents methodologies developed to address various aspects of homeless research, including enumeration of the population, screening for reporting duplications, estimating the annual number of incidents of homelessness, and exploring county-level estimates of homelessness. After implementing an algorithm to eliminate duplicate reporting, and using the baseline unduplicated reported number of homeless persons, a statewide estimate of the number of homeless individuals was derived. Following further adjustments for differences in agency reporting practices and after extrapolating for nonreported time periods, we estimated the number of Unique incidents of homelessness experienced in the state during the year of the study (1997). The policy implications of these findings are discussed.  相似文献   
997.
This work synthesizes and critically evaluates the results of field surveys conducted over the last 20 years in southern (lower) and northern (upper) Mesopotamia, with emphasis placed on the increasing contribution of off-site and intensive surveys to regional analysis. During the Ubaid period the density of settlement was probably higher in the rain-fed north than the irrigated south, and even during the phase of 3rd millennium B.C. urbanization, settlement densities in the north were probably equivalent to or even exceeded those in the south. Although trends in settlement were often synchronous between north and south, there was also a marked spatial variability in settlement, with declines in one area being compensated by rises elsewhere. Particularly clear was the existence of a major structural transformation from nucleated centers during the Bronze Age towards dispersed patterns of rural settlement and more extensive lower towns in the Iron Age.  相似文献   
998.
This paper examines the chronological implications for the prolonged use of matchlock muskets by the Bedouin during the Ottoman Period (1453–1918). Although the technology behind the matchlock ignition system is from the fifteenth century, this weapon was used by many Bedouin until the beginning of the twentieth century. As a result, the presence of gun parts from matchlock muskets poses a potential problem for identifying Bedouin occupations from the eighteenth and nineteenth centuries in the southern Levant and in northern Arabia. This issue is heightened by the paucity of diagnostic artifacts found at archaeological sites associated with the Bedouin during the Ottoman Period.  相似文献   
999.
1000.
This paper provides an account of the imagery portrayed on the banknotes that have been issued in central and eastern Europe during the 1990s. In doing so, it highlights the methodological complexity of undertaking such research, and emphasises the need for the development of a rigorously compiled database that can then be used to draw comparisons between the imagery of different states. Banknotes are more than simply economic phenomena, and they provide an important expression of the cultural and political identities that have helped to shape the nations in the past. Four main conclusions are drawn: first, it is these past identities that continue to dominate the construction of national identity today; second, the imagery associated with such national identity is mainly representative of masculine identities; third, it is mainly portraits of key historic personalities that dominate the imagery; and fourth, a wide range of differing mechanisms have been used to generate these images.  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