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   2151篇
  免费   8篇
  2159篇
  2025年   1篇
  2024年   3篇
  2023年   20篇
  2022年   23篇
  2021年   43篇
  2020年   83篇
  2019年   26篇
  2018年   24篇
  2017年   32篇
  2016年   25篇
  2015年   58篇
  2014年   51篇
  2013年   110篇
  2012年   113篇
  2011年   179篇
  2010年   157篇
  2009年   206篇
  2008年   160篇
  2007年   157篇
  2006年   165篇
  2005年   161篇
  2004年   36篇
  2003年   70篇
  2002年   65篇
  2001年   43篇
  2000年   41篇
  1999年   29篇
  1998年   14篇
  1997年   9篇
  1996年   12篇
  1995年   12篇
  1994年   6篇
  1993年   12篇
  1992年   3篇
  1991年   5篇
  1990年   2篇
  1989年   1篇
  1980年   1篇
  1979年   1篇
排序方式: 共有2159条查询结果,搜索用时 15 毫秒
131.
    
The application of superelastic Shape Memory Alloy (SMA) reinforcement in plastic hinge regions of bridge piers has been proven to reduce the residual displacement after a strong shaking owing to its unique shape recovery characteristics; however, the maximum deformation of the piers could increase due to the relatively lower modulus of elasticity of SMA bars and lower hysteretic energy dissipation capacity. In this context, this article applies a recently formulated probabilistic performance-based seismic assessment methodology that considers both the maximum and the residual deformation simultaneously to evaluate the performance of SMA reinforced bridge piers.  相似文献   
132.
台湾学者邢义田对古代罗马史素有研究,编译过资料选集,写作过专题论文和有关书评,翻译过重要文献,发表过考古调查报告,现场拍摄过文物照片。这些成果中有的内容为大陆史学界少见,因此颇具参考价值。  相似文献   
133.
冷战结束后,论者多认为雅尔塔体系已经\"崩溃\"。但是从国际体系的视角来看,这种提法并不正确。它混淆了国际体系、国际格局和国际秩序这三个概念,与当代国际关系发展的实践也不相符合①。国际体系、国际格局和国际秩序并不是一回事,国际格局的崩溃,并不就等于国际体系的崩溃;冷战的结束,只是美苏两极格局的寿终正寝,而不是雅尔塔体系的崩溃。雅尔塔体系是在吸取了人类数百年来建立国际体系的经验教训、特别是吸收了凡尔赛——华盛顿体系的经验教训基础上,建立的一个机制较为完善、国际秩序相对稳定的国际体系。冷战结束后,这个体系不仅没有崩溃,而且还有发展,有力地维护着第二次世界大战后世界的均势与和平②。  相似文献   
134.
《真定十方临济慧照玄公大宗师道行碑铭》浅谈   总被引:1,自引:1,他引:0  
《真定十方临济慧照玄公大宗师道行碑铭》是与正定临济寺有关的现有碑文资料中时代最早者,也是唯一一通专门为临济宗创始人义玄大宗师所立之碑。原碑早年已佚,日本佛教临济宗访华团于20世纪80年代赠送给正定有关部门的相关碑文资料对佛教临济宗及正定临济寺的研究具有重要的史料价值。  相似文献   
135.
    
Two spinicaudatan species, Triglypta eedemtensis Li sp. nov. and Dundgobiestheria mandalgobiensis Li gen. et sp. nov., are described on the basis of scanning electron microscopy (SEM) imaging of newly collected specimens from paper-thin laminated black shale of the Eedemt Formation exposed at the Eedemt locality in the Khootiin Khotgor coal mine region of Dundgobi Province in southeast Mongolia. Triglypta eedemtensis is ornamented mainly with puncta and a punctate fine reticulum; radial lirae occur only on two or three growth bands near the venter. The small spinicaudatan Triglypta is a common component of the Middle Jurassic Euestheria ziliujingensis fauna and Sinokontikia fauna, and is a typical taxon in the Middle Jurassic lacustrine sequences of northern Hebei and the Junggar and Turpan basins of the Xinjiang Autonomous District of China; however, it does not occur in stratigraphically higher units elsewhere. Therefore, the age of the Eedemt Formation should be considered Middle Jurassic rather than Early Cretaceous. The Eedemt Formation is much older than the Early Cretaceous Shinekhudag Formation in the Shine Khudag area of southeast Mongolia.  相似文献   
136.
This article will explore the multicultural challenges resulting from increasing numbers of migrant workers and foreign (non‐Chinese) brides in Taiwan, and discuss how such outside cultural influences create new forms of cultural expression, identity and citizenship. It will further describe experiences and present theories specific to Taiwan’s experience. Research on “transnational communities” is fairly advanced in Taiwan. “Transnational communities” in Taiwan are expected to “assimilate” quickly into mainstream Taiwanese society, and personal cultural needs and influences are largely ignored. These communities continue to remain isolated from mainstream Taiwanese society, thus making them “invisible” to society as a whole. Therefore, this research hopes to encourage research into “transnational communities” within the field of cultural policy studies and provide a basic picture of the cultural influence and development of these communities in Taiwan.  相似文献   
137.
关于武则天金简的几个问题   总被引:2,自引:0,他引:2  
董理 《华夏考古》2001,(2):79-85
1982年5月,河南省登封县唐庄乡农民屈西怀在嵩山峻极峰北侧牧羊,于大石缝中捡得一件金器。器呈片状长方形,类笏板,长36.3厘米,宽8.2厘米,厚约0.1厘米,纯金质,重247克。正面镌刻铭文,自右至左坚三行63字,每字直径约1厘米,双钩楷体,文日:“上言:‘大周 主武■,好乐真道,长生神仙,谨诣中岳嵩高山门,投金简一通,乞三官九府,除武■罪名。’太岁庚子七■甲申朔七■甲寅,小使■胡超稽首再拜谨奏。”此物一经发现,即引起轰动。后经专家鉴定,确属唐代武则天遗物,并命名为武则天金简,被定为国家一级珍…  相似文献   
138.
敦煌遗书中的装帧形式与书史研究中的装帧形制   总被引:2,自引:1,他引:1  
李致忠 《文献》2004,(2):75-97
敦煌遗书的文献资料价值与实物资料价值都是很丰富的,所以才形成今天世界性的显学--敦煌学.本文不想涉足内容方面的大学问,只想就敦煌遗书所反映出来的书籍的各种装帧形式,及与书史研究中书籍装帧形制之间的关系谈一些看法.不当之处欢迎批评指正.  相似文献   
139.
蒙古族的狩猎工具——布鲁及源流   总被引:1,自引:0,他引:1  
在漫长的历史岁月中,蒙古民族过着“逐水草而居”以畜牧经济为主的游牧生活,但狩猎经济在他们的生活中也占据着十分重要的地位。它曾是蒙古先民维持生存必要的经济形式之一。后来,牧养的牲畜成为他们生活的主要依靠后,狩猎作为衣食来源的一种补充和必要的护牧措施始终不曾被放弃。蒙古人的狩猎工具除马匹、猎犬、弓箭、猎刀、扎枪,套索、猎夹,以及后来使用的火枪外,还有一处传统的工具———布鲁。此为蒙古游牧民族特有的锤击和抛击猎物的击器。一、布鲁的形制及功用布鲁柄一般为榆木或山榆木等硬质木制作,形制呈前端弯曲的镰刀柄状,全长约…  相似文献   
140.
  总被引:1,自引:0,他引:1  
Recent zooarchaeological studies on water buffalo (Bubalus sp.) remains from China and south Asia question the traditional view that water buffalo were first domesticated in Neolithic China over 7000 years ago. The results from several recent population genetic studies of modern domesticated buffalo (Bubalus bubalis) are not consistent with each other, placing the original center of buffalo's domestication in south Asia, southeast Asia, or China. This paper reports a study using an ancient DNA approach to analyze water buffalo remains from Neolithic sites in north China to investigate their affinities with modern domesticated water buffalo, and to shed light on the origin of modern domesticated water buffalo in China.A 169 bp fragment of D-loop mitochondrial DNA was successfully amplified and verified for 13 of 24 bone samples obtained from seven archaeological sites along the Wei River valley in Shaanxi Province, China. The bone samples which yielded positive DNA can be dated to 8000–3600 cal. BP. The phylogenetic analysis of the obtained DNA sequences along with modern water buffalo sequences indicated that the ancient water buffalos were not the direct ancestor of modern domesticated water buffalo. However, the phylogenetic analysis, along with BLAST searches of these ancient DNA sequences, did demonstrate their relatedness to water buffalo more so than to any other bovid species, confirming the existence of indigenous wild (but now extinct) water buffalo species (B. mephistopheles) in ancient China.The DNA analysis of these ancient remains failed to establish direct links between modern domesticated water buffalo (B. bubalis) and indigenous water buffalo (B. mephistopheles) from ancient China. If further DNA studies of more ancient remains from other regions of China confirm the observation of solely indigenous water buffalo species in ancient China, it would suggest modern water buffalo might not have been first domesticated in China.  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