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   3251篇
  免费   58篇
  2024年   1篇
  2023年   22篇
  2022年   29篇
  2021年   54篇
  2020年   96篇
  2019年   34篇
  2018年   43篇
  2017年   53篇
  2016年   42篇
  2015年   90篇
  2014年   65篇
  2013年   167篇
  2012年   194篇
  2011年   285篇
  2010年   260篇
  2009年   318篇
  2008年   247篇
  2007年   243篇
  2006年   251篇
  2005年   246篇
  2004年   53篇
  2003年   115篇
  2002年   98篇
  2001年   69篇
  2000年   72篇
  1999年   45篇
  1998年   20篇
  1997年   15篇
  1996年   22篇
  1995年   15篇
  1994年   8篇
  1993年   16篇
  1992年   7篇
  1991年   7篇
  1990年   3篇
  1989年   2篇
  1980年   1篇
  1979年   1篇
排序方式: 共有3309条查询结果,搜索用时 15 毫秒
51.
The quick and accurate identification of post-earthquake rescue objects can minimize the casualties and property loss caused by earthquakes. With the rapid development of remote sensing technology, rescue objects can be identified through high-resolution remote sensing images. There are two main categories of approaches to identify rescue object through high-resolution images: automatic extraction by a computer and visual judgment by professionals. Although results can be obtained quickly by using automatic extraction, the accuracy of the results is unacceptably low. For visual judgment, the large demands for time and professionals restrict its wide practical application. In this study, we introduce crowdsourcing into the identification of post-earthquake rescue objects. First, we integrate the advantages of the computer and crowdsourcing, which means that the computer takes advantage of the speed of information processing, while crowdsourcing makes full use of human recognition capabilities. Second, we take visual judgment tasks out of the hands of professionals and entrust the tasks to workers in a crowdsourcing platform. Not only are the human resources infinite, but we can also improve the efficiency of identifying rescue objects. Third, we propose a crowdsourcing model that improves the quality of the results and saves human resources. Finally, experimental results demonstrate that our solution is feasible.  相似文献   
52.
53.
尉氏元代壁画墓札记   总被引:1,自引:0,他引:1  
尉氏县张氏镇壁画墓在最近的报道中被断为宋代。本文结合相关考古资料,从墓葬形制、壁画布局、仿木结构、人物服饰、墓门题记等几个方面进行对比分析,将该墓订正为元代。又依据文献记载和图像资料,对该墓壁画中“曾参行孝”和“焦花女哭麦”两组孝子图加以考证。并进一步梳理了考古所见二十四孝图像,发现其组合形式在宋金时期比较稳定,而元明时期则逐渐转向多元。  相似文献   
54.
The provenance of more than 2200-year-old terracotta warriors and horses in the Qin Shihuang Mausoleum is still a mystery, even though some researchers have inferred that the terracotta figures were produced near the mausoleum. The sporomorphs (pollen and spores) extracted from terracotta fragments of a warrior and a horse and compared with those obtained from soil samples from the Qin Dynasty layer in Pit No. 2 of the Qin Shihuang Mausoleum indicate that the pollen spectrum from the terracotta horse is different from that of the warrior, but similar to the local soil samples. Herbaceous pollen was dominant in the warrior sample, while arboreal pollen predominates in the horse and soil samples. Palynological evidence suggests that the terracotta horses were produced at a locality near the mausoleum, while the warrior came from a site which was further afield.  相似文献   
55.
Until the 19th century, most pigments were based on naturally occurring colored minerals and dyes, with three significant exceptions: Egyptian Blue, Chinese Blue/Purple and Maya Blue. The former two are alkaline-earth copper silicates, and because of this similarity it has been proposed that the Chinese pigments were derived from Egyptian Blue. Herein, we analyzed clumps of pigment from the Qin warriors and discovered that in spite of the structural similarity to Egyptian Blue, the micro-structural morphology of Chinese Purple is very different. Therefore, we believe that the synthesis technology for the Chinese pigments was a by-product of high-refractive index glasses (artificial jades) produced by Taoist monks. Further, the disappearance of these pigments from Chinese art and monuments concurrently with the decline of Taoism not only substantiates the link between the two, but also gives a striking example of how cultural changes in the society affected the scientific developments in ancient China.  相似文献   
56.
李建栋 《文献》2007,(2):85-88
日藏弘仁本<文馆词林>存二残文①.罗国威按:"此卷残,只遗两首作者、题不明残简,原件系弘仁抄本,高野山正智院藏.  相似文献   
57.
李定乾 《文献》2007,(1):83-89
王若虚(1174-1243),字从之,号慵夫,藁城(今河北藁城)人,金承安二年(1197)进士,金亡不仕,晚年自号滹南遗老.是金代后期著名文学理论家、经学家和文献学家,在金元之际学术界独步一时,与元好问堪称金代文化领域之双璧.本文拟对王若虚的著述尤其是他的<滹南遗老集>进行考述.  相似文献   
58.
在中国传统法律思想史上,历代的和谐思想由来已久,我国政府2005年年初提出的社会主义和谐社会的构想是有其深远的思想文化基础的,并非是理论上的凭空创造,而是从中华法律文化思想宝库中采撷出的思想精华并加以理论创新而来。因此,我们要加强对我国历史上关于社会建设理论的研究,按照去伪存真、去粗取精的要求,努力做到古为今用。  相似文献   
59.
平底碟是晚期定窑瓷器中的一种非常常见的器型,也是最传统、最保守的一种器型,自北宋晚期以来直至金代,平底碟在各地不同时代的早晚均有发现,体现了一定的演变规律,这也为我们整体上探讨其发展演变提供了可能.对其进行探讨,从中也可以体现同时期整个定窑器物演变上的某些线索.  相似文献   
60.
金为加强东北地区的稳定与发展,对东北地区的官员管理极为重视,依据东北的特点选择官员,严格考课,并将猛安谋克这一女真族的军事组织也纳入封建考课体系内,同时强化监察制度,制定了具有东北特色的官员管理制度.  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