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   529篇
  免费   17篇
  2024年   1篇
  2023年   5篇
  2020年   13篇
  2019年   12篇
  2018年   18篇
  2017年   26篇
  2016年   15篇
  2015年   10篇
  2014年   19篇
  2013年   118篇
  2012年   16篇
  2011年   16篇
  2010年   19篇
  2009年   15篇
  2008年   10篇
  2007年   11篇
  2006年   9篇
  2005年   6篇
  2004年   4篇
  2003年   10篇
  2002年   13篇
  2001年   9篇
  2000年   11篇
  1999年   39篇
  1998年   29篇
  1997年   10篇
  1996年   3篇
  1995年   6篇
  1994年   5篇
  1993年   3篇
  1992年   4篇
  1991年   3篇
  1990年   3篇
  1989年   5篇
  1988年   4篇
  1987年   4篇
  1986年   3篇
  1985年   1篇
  1984年   2篇
  1983年   4篇
  1982年   4篇
  1981年   4篇
  1980年   6篇
  1979年   2篇
  1978年   4篇
  1977年   7篇
  1976年   1篇
  1975年   3篇
  1966年   1篇
排序方式: 共有546条查询结果,搜索用时 0 毫秒
541.
Roads designed by civil or military engineers for animal-drawn vehicles before the arrival of the railways constituted an essential factor for the movement of goods and people and for the economy and trade in different countries. The improvement in road construction techniques over the 18th and 19th centuries, following the creation of the first civil engineering colleges and institutions, allowed greater transportation at diminishing cost. Despite its significance, this heritage has received comparatively little attention from industrial archaeologists. As such, the object of the present article is to provide an overview of the development in road planning and construction in Spain over the 18th and 19th centuries, in order to demonstrate the historical and technological value of these roads. The article also presents two sections of Spanish roads corresponding to the start and end of the study period, and identifies some of the main archaeological elements dating to their time of construction that prove the evolution in road technology. This process has made it possible to create an inventory which incorporates the main elements that characterise this type of infrastructure.  相似文献   
542.
543.
544.
The authors describe the discovery of the remains of two unidentified skeletonised individuals in a small town located in southern Italy. The bodies were discovered while workers were preparing to lay an oil pipeline. The two individuals were found at a depth of 2 meters, and in very close proximity to one other. The recovery process of the skeletonised remains and their related findings, carried out by a team of forensic anthropologists and archaeologists, is described here.Archaeological examination determined that the remains date back to the 4th millennium B.C. Forensic anthropological and odontological examinations were performed to determine the biological profile of the skeletal remains by estimation of age and height, as well as the determination of sex. Age determination was performed by the Kerley and Ubelaker (1978, Revision in the microscopic method of estimating age at death in human cortical bone. Am. J. Phys. Anthropol., 49, 545–546) histological method using a 1 mm thick piece of bone tissue taken from the diaphyses of femur in both individuals. Dental age was estimated by examining root transparency. In order to determine the height of the individuals, various research methods based on the dimensional values of particular skeletal structures were applied. DNA analysis showed genotype differences of all the systems as compared to the haplotypes of present day subjects. This provided confirmation that the skeletal remains were from individuals of an ancient population (4th millennium B.C.). In addition, radiocarbon dating provided useful information as to the approximate period of death of the individuals. Interpretation was further enhanced by analysis of various bone fragments from each of the skeletons by high resolution mass spectrometry. 3D computerized imaging was used to analyse the patterns of skull fractures present, which resulted in supporting the hypothesis that the fractures were caused by stoning.  相似文献   
545.
546.
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