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   2438篇
  免费   47篇
  2023年   19篇
  2022年   28篇
  2021年   47篇
  2020年   74篇
  2019年   26篇
  2018年   31篇
  2017年   37篇
  2016年   31篇
  2015年   65篇
  2014年   54篇
  2013年   122篇
  2012年   136篇
  2011年   211篇
  2010年   181篇
  2009年   242篇
  2008年   185篇
  2007年   184篇
  2006年   194篇
  2005年   184篇
  2004年   49篇
  2003年   83篇
  2002年   76篇
  2001年   52篇
  2000年   53篇
  1999年   34篇
  1998年   15篇
  1997年   12篇
  1996年   12篇
  1995年   14篇
  1994年   7篇
  1993年   13篇
  1992年   3篇
  1991年   6篇
  1990年   2篇
  1989年   1篇
  1980年   1篇
  1979年   1篇
排序方式: 共有2485条查询结果,搜索用时 140 毫秒
1.
水资源短缺一直制约着京津唐地区经济和社会的发展。20世纪70年代,因缺水引发的经济、社会问题逐渐凸显,促使中央和地方政府开始考虑实施跨流域调水工程。引滦工程作为北方最大的跨流域调水工程,其决策经历了曲折的过程。1958年,北京和唐山曾分别提出引滦河水的设想,唐山还实施了引滦入还和引还入陡工程。1972年,海河流域大旱促使中央做出加快实施引滦工程的决定,但由于地质情况复杂等原因,引滦工程设计方案被反复修改。1981年,天津提出了单独引滦济津路线并得到了中央的支持。引滦工程对缓解京津唐用水紧张发挥了重要作用,天津是引滦工程受益最大的地区。  相似文献   
2.
兵团文化研究综述   总被引:1,自引:0,他引:1  
郭换平 《丝绸之路》2010,(10):34-37
兵团文化是兵团人在屯垦戍边的过程中所创造的独具特色的文化,具有巨大的感召力和凝聚力,对于传播中华文化、吸收各民族的优秀文化、维稳固边、促进兵团和谐社会的构建都发挥了重大的作用。目前,学术界对于兵团文化研究的成果颇丰,本文从兵团文化的内涵、内容、特征、作用以及如何发展兵团文化着手,对以往的研究成果进行梳理。  相似文献   
3.
贵州贡院建于明嘉靖十六年首开乡闱时,其发展历程正是贵州科举史的缩影。其结构及功能与他省贡院相似,规模居于全国中下等,号舍最少时不足千间,最多时超过四千间。其明末毁于战火,清代重建后亦频繁维修,经费则以公款为主,辅以民间捐助。  相似文献   
4.
Non‐invasive materials characterisation of reconstructed statues of Emperor Qin Shihuang's Terracotta Army has revealed distinct micro‐geochemical patterning within the clay paste used in their manufacture. The significance of this is explored in terms of the production sequence, logistics and supply‐chain management involved in the construction of this enormous funerary assemblage. Of particular interest is a compositional distinction between figures marked with the names ‘Gong’ (宫) and ‘Xianyang’ (咸阳). These seem to represent the products of two workshops involved in the supply of ceramic objects for this ambitious, large‐scale building project undertaken by the Qin Empire during the third century bce .  相似文献   
5.
Journal of World Prehistory - From northern China, millet agriculture spread to Korea and the Maritime Russian Far East by 3500–2700 BC. While the expansion of agricultural societies across...  相似文献   
6.
李家桥 《文献》2021,(2):152-166
1908至1910年,王国维曾先后抄录、批校过三种版本的《录鬼簿》,所涉底本有明抄本、清尤贞起钞本和清《楝亭十二种》刻本。而自上世纪四十年代以后,由于前两种抄本在大陆已不可获见,故关于王国维抄校《录鬼簿》及《录鬼簿》版本相关的研究均未能细论其详。本文结合前人对王国维校勘《楝亭十二种》本《录鬼簿》的研究成果,另将台湾傅斯年图书馆所藏的明抄本、尤抄本及国家图书馆藏影抄尤本、日本东洋文库藏王国维据明抄本所作的过录本四种纳入综合考察,在对王国维抄校《录鬼簿》的始末进行细致梳理过程中,发现王氏起初措意于抄校的目的乃是为其正在编纂的戏曲著作《曲录》作参考。但王氏在得到影抄尤本后虽收齐了三种版本《录鬼簿》,却最终放弃当初的刊刻打算,乃是因为刘世珩主持的《暖红室汇刻传奇》计划中早已纳入《录鬼簿》。藉此不仅可明晰王国维早年戏曲研究脉路,而且对《录鬼簿》的版本研究亦可提供新的参考。  相似文献   
7.
8.
In archaeology, strontium isotope analysis is developing into an efficient scientific technique for tracing the movement of prehistoric humans and animals. Determining the local bioavailable 87Sr/86Sr ratio range is the key to distinguishing whether the human or animal is indigenous to the local area. It has been shown that the 87Sr/86Sr ratio in the enamel of pigs can be an excellent sample to determine the range of local strontium isotope ratio at the site. However, pigs may not be all local at the site, and there is no special study on whether pigs’ different ages and tooth types impact the local strontium isotope characteristics. In this paper, the tooth enamel of 19 pigs from the Zaoshugounao site for strontium isotope ratio (87Sr/86Sr) by multicollector–inductively coupled plasma mass spectrometry. There were no significant differences in 87Sr/86Sr ratios of local pigs at different months and different molar types, which did not affect the determination of the local strontium isotope standard. Based on the local strontium isotope ratio range (0.711056–0.711476), we found that five pigs were non-local. The Jing and Wei river basins (in Guanzhong basin) and northern Shaanxi are likely sources of non-pigs.  相似文献   
9.
Geographical distance constitutes friction in searching for research collaborators. Taking advantage of a quasinatural experiment featured by High-Speed Railway (HSR) lines in China, this paper employs the difference-in-differences model to identify the causal impact of a substantial improvement in the intercity transportation infrastructure on collaborative innovation across cities. The data pertain to a universe of patent applications filed by Chinese universities and their citations. We find that HSR contributes to a substantial increase in the innovation quantity and quality of collaborative patenting innovation between universities and corporates. It contributes to industry collaboration by utilizing university academic disciplines in the related technology fields. Lastly, HSR facilitates universities to search for new research partners with better quality beyond the geographical boundary.  相似文献   
10.
This paper examines interprovincial migration in the People's Republic of China (PRC) during 1982–87 when China was going through economic restructuring. Chinese migration patterns bear some resemblances as well as dissimilarities with those generally observed in Western societies. In China, the age-specific migration rate does not vary much until the preretirement stage. Return to places of origin is obviously the most plausible explanation of Chinese migration patterns. In addition, a clear-cut gender gap exists, higher than that imagined in Western societies. Chinese women appear far behind Chinese men in their propensity to migrate, and the determinants of migration are quite different for Chinese women and Chinese men.  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