全文获取类型
收费全文 | 3782篇 |
免费 | 121篇 |
出版年
2020年 | 42篇 |
2019年 | 49篇 |
2018年 | 80篇 |
2017年 | 80篇 |
2016年 | 106篇 |
2015年 | 74篇 |
2014年 | 67篇 |
2013年 | 1068篇 |
2012年 | 97篇 |
2011年 | 127篇 |
2010年 | 108篇 |
2009年 | 88篇 |
2008年 | 94篇 |
2007年 | 64篇 |
2006年 | 63篇 |
2005年 | 62篇 |
2004年 | 55篇 |
2003年 | 30篇 |
2002年 | 38篇 |
2001年 | 60篇 |
2000年 | 49篇 |
1999年 | 56篇 |
1998年 | 38篇 |
1997年 | 43篇 |
1996年 | 38篇 |
1995年 | 30篇 |
1994年 | 37篇 |
1993年 | 42篇 |
1992年 | 44篇 |
1991年 | 35篇 |
1990年 | 29篇 |
1989年 | 36篇 |
1988年 | 34篇 |
1987年 | 45篇 |
1986年 | 30篇 |
1985年 | 48篇 |
1984年 | 37篇 |
1983年 | 65篇 |
1982年 | 48篇 |
1981年 | 55篇 |
1980年 | 54篇 |
1979年 | 38篇 |
1978年 | 40篇 |
1977年 | 58篇 |
1976年 | 42篇 |
1975年 | 44篇 |
1974年 | 31篇 |
1973年 | 29篇 |
1972年 | 26篇 |
1971年 | 33篇 |
排序方式: 共有3903条查询结果,搜索用时 15 毫秒
21.
James G. Strathman 《Journal of regional science》1992,32(4):501-509
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
22.
Günter Grönbold 《Indo-Iranian Journal》1992,35(4):273-297
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
23.
24.
Carl G. Amrhein 《Geographical analysis》1986,18(1):1-18
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
25.
26.
27.
28.
29.
30.
The neutron activation analysis results from 30 glass samples were subjected to cluster analysis. The reliable localization of part of the medieval glass finds from Preslav enabled the evaluation of the variety of the production of a medieval glass workshop (ninth-tenth century), allowing conclusions to be made about the technological level of glass-making in Bulgaria during the Middle Ages. The work proved that NAA followed by cluster analysis is a successful approach to finding the local and chronological features of the investigated glasses. 相似文献