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   8689篇
  免费   436篇
  2023年   44篇
  2020年   128篇
  2019年   195篇
  2018年   268篇
  2017年   245篇
  2016年   317篇
  2015年   208篇
  2014年   191篇
  2013年   2398篇
  2012年   271篇
  2011年   295篇
  2010年   275篇
  2009年   271篇
  2008年   224篇
  2007年   247篇
  2006年   205篇
  2005年   130篇
  2004年   110篇
  2003年   113篇
  2002年   123篇
  2001年   161篇
  2000年   117篇
  1999年   135篇
  1998年   96篇
  1997年   91篇
  1996年   97篇
  1995年   81篇
  1994年   68篇
  1993年   86篇
  1992年   83篇
  1991年   78篇
  1990年   66篇
  1989年   63篇
  1988年   65篇
  1987年   76篇
  1986年   79篇
  1985年   83篇
  1984年   91篇
  1983年   101篇
  1982年   88篇
  1981年   83篇
  1980年   78篇
  1979年   75篇
  1978年   80篇
  1977年   80篇
  1976年   75篇
  1975年   85篇
  1974年   47篇
  1973年   49篇
  1972年   48篇
排序方式: 共有9125条查询结果,搜索用时 15 毫秒
21.
22.
In 1985 a Neanderthal skeleton was found in the cave of Kebara in southern Mt. Carmel. Electron spin resonance (ESR) dates have been obtained on tooth enamel of gazelles found in layer X, just overlying the layer in which the skeleton was found. Assuming early uptake of uranium by the teeth, they yield an age of 60 ± 6 ka; assuming gradual, linear uptake of uranium yields an age of 64 ± 6 ka. Both age estimates are consistent with a previous estimate for the skeleton, based on TL dating of burnt flint, of 60 ± 4 ka.  相似文献   
23.
The interrelationships between macro and micro factors in the analysis of interstate migration in the United States are explored. A synthesis between these factors is attempted "by combining objectively calibrated characteristics of states with their subjectively measured counterparts....First, the relationships between the objective variables and their subjective counterparts are analyzed. Second, both sets of variables are used to explain residential preferences and migration. Third, a series of path models are constructed to indicate how the subjective variables act as intervening variables between their objective counterparts and migration."  相似文献   
24.
25.
26.
27.
28.
In this paper Aboriginal land rights are analysed from the perspective of a disadvantaged group seeking access to a scarce resource controlled by external agents. The Aboriginal participants in land rights politics are found to be actively seeking ways in which their interest in the land can most effectively be communicated to external groups which have constructed well-formed, but often distorted images of what constitutes a genuine Aboriginal interest in the land These externally constructed notions of Aboriginality and what constitutes a valid land claim are influencing the concepts used by Aboriginal groups in the public political arena to demonstrate their unique interest in the land In this paper three examples of this process are explored- the emphasis of a specific gender model, the emphasis on spatially discrete sacred sites and the emphasis on the bounded tribal territory.  相似文献   
29.
30.
Results of a combined archaeological and analytical project of Late Neolithic/Early Bronze Age copper, bronze and lead artefacts from four distinct areas of mainland Greece are presented. The aim of the study is to understand better the stages of technological development of each region, their possible ore sources and also to assess any external contribution to or internal evolution of their metallurgy. Interesting results which could challenge the established view of Late Neolithic/Early Bronze Age metallurgy in the Greek mainland are presented.  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