全文获取类型
收费全文 | 1799篇 |
免费 | 58篇 |
专业分类
1857篇 |
出版年
2020年 | 23篇 |
2019年 | 39篇 |
2018年 | 52篇 |
2017年 | 64篇 |
2016年 | 66篇 |
2015年 | 36篇 |
2014年 | 44篇 |
2013年 | 492篇 |
2012年 | 47篇 |
2011年 | 56篇 |
2010年 | 49篇 |
2009年 | 54篇 |
2008年 | 53篇 |
2007年 | 26篇 |
2006年 | 39篇 |
2005年 | 41篇 |
2004年 | 38篇 |
2003年 | 37篇 |
2002年 | 33篇 |
2001年 | 29篇 |
2000年 | 30篇 |
1999年 | 15篇 |
1998年 | 32篇 |
1997年 | 26篇 |
1996年 | 19篇 |
1995年 | 17篇 |
1994年 | 23篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 13篇 |
1990年 | 14篇 |
1989年 | 8篇 |
1988年 | 14篇 |
1987年 | 18篇 |
1986年 | 19篇 |
1985年 | 16篇 |
1984年 | 28篇 |
1983年 | 20篇 |
1982年 | 23篇 |
1981年 | 12篇 |
1980年 | 16篇 |
1979年 | 18篇 |
1978年 | 9篇 |
1977年 | 18篇 |
1976年 | 14篇 |
1975年 | 12篇 |
1974年 | 11篇 |
1972年 | 9篇 |
1970年 | 7篇 |
1968年 | 7篇 |
排序方式: 共有1857条查询结果,搜索用时 15 毫秒
131.
Peter Rostankowski 《Eurasian Geography and Economics》2013,54(7):409-419
The Soviet program to proceed from further expansion of the grain area in the semi-arid steppe zone to intensification of graingrowing in the humid Nonchernozem Zone after decades of neglect is considered a landmark decision in the history of Soviet agriculture. If successfully carried out, the Nonchernozem program might yield by the late 1980s a grain increment equivalent to the amount now being imported by the Soviet Union for its own needs and for re-export to its allies. The implementation of the Non-chernozem program would also have consequences for regional grain-production patterns in the Soviet Union. The Nonchernozem Zone would be in a position to make a more significant contribution to the demand for grain in the industrial centers of European Russia, thus easing the pressure on the virgin lands of northern Kazakhstan and reducing the need for the present long grain hauls. Finally, a greater shift of grain production into the humid Nonchernozem would be in keeping with a program of water economies since grain output in the humid zone requires less than half of the water needed for grain production in the arid zone. The success of the Nonchernozem program is conditioned on greater attention to the development of rural infrastructure, particularly roads, which the author considers a key element in upgrading the agriculture of the region. 相似文献
132.
133.
Niels Peter Lemche 《SJOT: Scandinavian Journal of the Old Testament》2013,27(1):103-121
ABSTRACT This article traces the ideology that allowed Christian civilization to conquer the world. It opens with a view of biblical “national” foundation myths, the Exodus and the Babylonian Exile, and shows how this ideology also allowed for ethnic cleansing, if not genocide, and how those played a dominant role in the mind of western Christians who simply adopted the biblical attitude to foreign nations as their own. A changing perspective including a not so historically dominated reading of the Bible may put an end to the western idea of a God given right to oppress all the nations of the world. 相似文献
134.
Cultural Landscapes of Britain 总被引:1,自引:0,他引:1
Peter Fowler 《International Journal of Heritage Studies》2013,19(3):201-212
'Britain' and 'cultural landscape' as used here are defined. The World Heritage categorisation provides the basis for a brief review of the range of such landscapes in Britain, with specific examples being named and briefly characterised. Relict landscapes are particularly noted. 'Threats to cultural landscapes are identified as of both development and decrepitude. A short discussion of the purpose and viability of cultural landscapes in Britain, for national and global purposes, concludes by noting a number of British cultural landscapes recognisable in World Heritage terms and potentially relevant to the European Landscape Convention 2000. 相似文献
135.
136.
137.
138.
139.
140.
A General Misspecification Test for Spatial Regression Models: Dependence, Heterogeneity, and Nonlinearity 总被引:3,自引:0,他引:3
Thomas de Graaff Raymond J.C.M. Florax Peter Nijkamp & Aura Reggiani 《Journal of regional science》2001,41(2):255-276
There is an increasing awareness of the potentials of nonlinear modeling in regional science. This can be explained partly by the recognition of the limitations of conventional equilibrium models in complex situations, and also by the easy availability and accessibility of sophisticated computational techniques. Among the class of nonlinear models, dynamic variants based on, for example, chaos theory stand out as an interesting approach. However, the operational significance of such approaches is still rather limited and a rigorous statistical-econometric treatment of nonlinear dynamic modeling experiments is lacking. Against this background this paper is concerned with a methodological and empirical analysis of a general misspecification test for spatial regression models that is expected to have power against nonlinearity, spatial dependence, and heteroskedasticity. The paper seeks to break new research ground by linking the classical diagnostic tools developed in spatial econometrics to a misspecification test derived directly from chaos theory—the BDS test, developed by Brock, Dechert, and Scheinkman (1987). A spatial variant of the BDS test is introduced and applied in the context of two examples of spatial process models, one of which is concerned with the spatial distribution of regional investments in The Netherlands, the other with spatial crime patterns in Columbus, Ohio. 相似文献