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   3869篇
  免费   159篇
  2020年   60篇
  2019年   76篇
  2018年   103篇
  2017年   111篇
  2016年   147篇
  2015年   89篇
  2014年   98篇
  2013年   1039篇
  2012年   115篇
  2011年   121篇
  2010年   114篇
  2009年   111篇
  2008年   99篇
  2007年   71篇
  2006年   83篇
  2005年   71篇
  2004年   56篇
  2003年   56篇
  2002年   65篇
  2001年   64篇
  2000年   53篇
  1999年   44篇
  1998年   51篇
  1997年   51篇
  1996年   44篇
  1995年   43篇
  1994年   44篇
  1993年   46篇
  1992年   37篇
  1991年   35篇
  1990年   25篇
  1989年   26篇
  1988年   28篇
  1987年   38篇
  1986年   38篇
  1985年   39篇
  1984年   56篇
  1983年   44篇
  1982年   49篇
  1981年   31篇
  1980年   44篇
  1979年   42篇
  1978年   28篇
  1977年   35篇
  1976年   30篇
  1975年   23篇
  1974年   21篇
  1973年   23篇
  1972年   26篇
  1971年   21篇
排序方式: 共有4028条查询结果,搜索用时 31 毫秒
91.
92.
Abstract. In postcommunist politics many of the ‘new national right’ political formations in Eastern Europe and the former Soviet Union have joined forces with the communist successor parties. Such a combination is, on the surface, a baffling mixture; how is it possible that two fundamentally different ideological approaches (nationalism and internationalist socialism) can coexist and actively cooperate to form such a potent political force? What are the conditions under which such political cooperation emerges? This article attempts to answer the above questions by, first, empirically testing the effects of several factors which might explain postcommunist–nationalist political cooperation. Second, the quantitative analysis is buttressed with a comparison of the Hungarian and Russian cases. The analysis indicates that the most important variable associated with the emergence of postcommunist–nationalist political cooperation is the effect of previous regime type.  相似文献   
93.
94.
95.
96.
Excavation of Testar del Molí, the only workshop found in the Manises-Paterna area, revealed the existence of a fourteenth-century ceramic workshop covering the remains of the thirteenth-century workshop. This study is concerned with the fourteenth-century production, and forthcoming papers will connect both epochs following the findings of current excavations. The chemical and mineralogical characterization of the ceramic production of this workshop shows the presence of three groups of ceramic pastes which could also be distinguished by, and, thus, related to, their daily use. The raw materials found in the excavation have also been mineralogically and chemically characterized, and a model of possible mixtures of raw materials has also been developed in order to determine their possible use in the manufacture of the pottery previously characterized.  相似文献   
97.
The disappearance of man‐made borders and the need for increased international cooperation seem to prelude a removal of unnecessary obstacles between actors in different countries. This article is concerned with the relationship between political borders, economic development of border regions and networking of companies located there. It presents a ‘state of the art’ of research on border region development and trans‐border networking by companies. Based upon this research, the article concludes with a discussion on conditions that influence the emergence of new corporate networking in border regions, including effective policy action.  相似文献   
98.
Lead-glazed pottery from the medieval workshop of Les Olleries Majors (Paterna, Spain) has been studied by Mössbauer spectroscopy, X-ray diffraction, X-ray fluorescence and optical spectroscopy. Yellow, brown and honey-coloured glazes occur on pots glazed on only one surface. They have virtually identical compositions and transmittance spectra, their apparent differences in colour are due to the colours of the underlying pastes. Yellow glazes occur on cream-coloured calcareous bodies, honey-coloured glazes occur on less calcareous bodies with some development of hematite, while brown glazes occur on red siliceous cooking-pots. Green glazes are found on pots glazed on both surfaces; the glazes trapped CO2 evolved by decomposing carbonates, resulting in an internal reducing environment. This caused the reduction of iron to the ferrous state which coloured the glaze green by diffusion.  相似文献   
99.
100.
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