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   6431篇
  免费   300篇
  2020年   93篇
  2019年   117篇
  2018年   176篇
  2017年   197篇
  2016年   215篇
  2015年   160篇
  2014年   154篇
  2013年   1853篇
  2012年   158篇
  2011年   213篇
  2010年   169篇
  2009年   168篇
  2008年   140篇
  2007年   141篇
  2006年   126篇
  2005年   70篇
  2004年   83篇
  2003年   72篇
  2002年   74篇
  2001年   84篇
  2000年   104篇
  1999年   85篇
  1998年   62篇
  1997年   74篇
  1996年   56篇
  1995年   68篇
  1994年   50篇
  1993年   60篇
  1992年   47篇
  1991年   68篇
  1990年   48篇
  1989年   63篇
  1988年   45篇
  1987年   63篇
  1986年   58篇
  1985年   83篇
  1984年   74篇
  1983年   71篇
  1982年   58篇
  1981年   67篇
  1980年   73篇
  1979年   65篇
  1978年   73篇
  1977年   64篇
  1976年   79篇
  1975年   54篇
  1974年   49篇
  1973年   52篇
  1972年   38篇
  1969年   35篇
排序方式: 共有6731条查询结果,搜索用时 46 毫秒
1.
2.
Palace lanterns were important and highly visible decorations in the imperial palace in Beijing, China, during the Qing dynasty (1636–1912). Most lanterns had colourful tassels made of fibres. The study performed a comprehensive investigation of the materials and dyes used for palace lantern tassels preserved in The Palace Museum, Beijing. Eight samples with different colours, including yellow, green and red, from five palace lanterns were analysed. By using ultra-performance liquid chromatography combined with time-of-flight mass spectrometry, the compositions of the dyes were identified quickly, and thus the dyes' origins were explored. A X-ray fluorescence spectrometer assisted in the detection of whether a mordant was used during the dyeing process. As a result, the tassels were all made of silk, discovered through the use of microscopic observation and micro-Fourier transform infrared spectrometry analysis. Different dyeing techniques were found in these tassels: yellow tassels were dyed by cork tree or turmeric by a direct dyeing method; greens were dyed by pagoda bud with an iron mordant, or by the combination of cork tree and indigo using multi-dyeing method; and red tassels were coloured with different acid red industrial dyes. These results provide valuable data for the conservation of ancient textile tassels and contribute to the investigation of other hanging tags.  相似文献   
3.
Geographic research on neoliberalism has explored the restructuring of educational landscapes wrought through marketisation of preschool, school and higher-education provision and considered the responsibilisation of parents and children for educational outcomes. This study develops understanding of the contingent emergence of neoliberal educational reform, and its progressive and regressive impacts, through an examination of the burgeoning private tuition market in England and Wales. The paper outlines the contours of the previously hidden supplementary education industry, demonstrating that it reinforces regional and classed inequalities, while opening possibilities for ethnic minority advancement. Conceptually, the paper advances debate about socio-spatial specificity in neoliberal change, showing that the intersection of policy, free markets and consumer behaviour reshapes the educational landscape in ways that extend beyond state intention and control. Through these processes, contingent market forms are produced that offer social mobility for some, but ensure the social reproduction of enduring regimes of power.  相似文献   
4.
5.
6.
Summary. Recent archaeological work has thrown fresh light on the region of Moravia and SW Slovakia (ČSSR) at the time of the Roman Empire. It is now apparent that, as on other frontiers, Roman influence extended far beyond the Danubian Limes . This paper describes six sites with Roman-style masonry buildings; one of the sites, Mušov, has produced evidence of Roman military occupation and is associated with the Marcomannic Wars of Marcus Aurelius; the other five, however, are of civilian character with an interesting admixture of Roman and German structures and artefacts. These sites provide us with an insight into the relationship of the client kingdom of the Quadi with Rome.  相似文献   
7.
8.
The Late Neolithic of southeast Hungary is known almost exclusively from excavations of large settlement mounds, or tells. Geochemical analyses of sediments collected from boreholes at small, flat Late Neolithic and Early Copper Age settlements in Hungary's Körös River basin provide data necessary to interpret the spatial organization of small settlements for the first time in this region. Principal Components Analysis of multi-element data produced a workable number of variables. Spatial analyses of these components via interpolation in ArcGIS 9 identified specific task areas, and when combined with sediment characterizations, phosphate ‘spot-tests’ and pH, suggest long-term cultural traditions in the location of activity zones within small farmsteads. The results demonstrate the usefulness of multi-element geochemistry as an intra-site prospection method.  相似文献   
9.
10.
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