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   8128篇
  免费   368篇
  2023年   53篇
  2020年   145篇
  2019年   158篇
  2018年   299篇
  2017年   304篇
  2016年   356篇
  2015年   218篇
  2014年   223篇
  2013年   2146篇
  2012年   239篇
  2011年   286篇
  2010年   231篇
  2009年   206篇
  2008年   194篇
  2007年   153篇
  2006年   155篇
  2005年   113篇
  2004年   103篇
  2003年   86篇
  2002年   80篇
  2001年   135篇
  2000年   103篇
  1999年   117篇
  1998年   95篇
  1997年   89篇
  1996年   77篇
  1995年   64篇
  1994年   62篇
  1993年   95篇
  1992年   81篇
  1991年   62篇
  1990年   63篇
  1989年   71篇
  1988年   61篇
  1987年   84篇
  1986年   62篇
  1985年   82篇
  1984年   60篇
  1983年   110篇
  1982年   82篇
  1981年   82篇
  1980年   85篇
  1979年   63篇
  1978年   72篇
  1977年   89篇
  1976年   71篇
  1975年   73篇
  1974年   57篇
  1973年   51篇
  1971年   56篇
排序方式: 共有8496条查询结果,搜索用时 15 毫秒
51.
ABSTRACT. This paper examines the impacts of JRS articles in the areas of theory, methods and empirical analysis, as represented by subsequent citations reported in the Social Sciences Citation Index. A model relating the mix of theoretical, methodological and empirical research published in the JRS to subsequent citations is estimated. The time distribution of theoretical and empirical citations also indicates that the knowledge diffusion process in these two areas may be segmented.  相似文献   
52.
Summary At the end of the second chapter of the Buddhist Klacakra-Tantra (dated c. 10th century) we find a group of verses in which several doctrines are characterized and criticized: Brahmanism, Vaisnavism, aivism, materialism, Islam and Jainism. Moreover the text refers to Buddhism itself as well as the so-called heterodox Buddhist schools. It is the only old Sanskrit text known until now in which the Islam is mentioned and recognized as a doctrine.  相似文献   
53.
54.
55.
This paper is concerned with the products of a number of Neolithic quarries in highland Britain. It investigates the claim that the scale of axe distribution was partly the result of social factors which resulted in these artefacts gaining an added value in areas remote from their sources. One case study considers the sequence of production in Cumbria, in relation to the tensile strength of the rock quarried in different parts of the region. It shows that these considerations had only a limited influence over the choice of stone source and the scale on which it was worked. A second study compares the tensile strength of the main raw materials used for making non-flint axes with the extent to which these sources were actually exploited. Again there is only a limited relationship between the two, suggesting that social factors may indeed have been important.  相似文献   
56.
A simulation model of a multiregional labor migration process is developed. Information about employment conditions in alternative regions is transmitted in a combination of three channels. The adopted emission policies directly control the amount of information available to potential migrants which, in turn, determines the potential migrant's perception of the level of welfare in the other regions. The effect of several different advertising policies on migration streams is examined. Employers can pursue a number of policies designed to maximize their return. Other agencies adopt policies that facilitate the matching process between unemployed workers and vacant jobs. Results are presented for a number of simulation experiments.  相似文献   
57.
58.
59.
60.
ABSTRACT. This paper presents a statistical procedure for empirically establishing linkages between regional economies. Using Granger's definition of causality and the final prediction error technique for lag-length specification suggested by Hsiao, a linked, multiregional employment model is developed. The forecast performance of the linked model is compared to models which do not include interregional linkages. It is shown that forecast error is reduced by taking into account employment interrelationships between regions.  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