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   776篇
  免费   48篇
  2024年   4篇
  2023年   6篇
  2022年   4篇
  2021年   10篇
  2020年   17篇
  2019年   29篇
  2018年   50篇
  2017年   53篇
  2016年   42篇
  2015年   37篇
  2014年   28篇
  2013年   154篇
  2012年   27篇
  2011年   35篇
  2010年   28篇
  2009年   25篇
  2008年   24篇
  2007年   17篇
  2006年   10篇
  2005年   6篇
  2004年   11篇
  2003年   13篇
  2002年   6篇
  2001年   10篇
  2000年   13篇
  1999年   8篇
  1997年   9篇
  1996年   8篇
  1995年   10篇
  1993年   9篇
  1992年   5篇
  1991年   5篇
  1990年   6篇
  1986年   4篇
  1980年   4篇
  1977年   9篇
  1976年   5篇
  1975年   5篇
  1972年   5篇
  1971年   4篇
  1969年   5篇
  1968年   3篇
  1967年   4篇
  1966年   4篇
  1965年   3篇
  1964年   3篇
  1961年   3篇
  1960年   3篇
  1959年   4篇
  1950年   3篇
排序方式: 共有824条查询结果,搜索用时 15 毫秒
821.
The soil formation in a number of pits on a neolithic excavation was compared with that in adjacent loess soils (Hapludalfs) under forest and arable and in Bavaria, Southern Germany. The differences between the soils under consideration were mainly characterized by micromorphological quantification of the illuviated fine clay. In the archaeological pits the amount of illuviated fine clay proved to be nearly twice as much as that in the undisturbed soils. The amount of illuviated coarser matrix components (fine and coarse clay and fine silt) in the neolithic pits did not differ significantly from that in the natural soils. The large amount of illuviated fine clay in the pits was ascribed to the presence of potash during the period of their formation. The formation of coarse grained illuviation cutans was related to deforestation, after which illuviation of the fine clay decreased in intensity and came to a stop.  相似文献   
822.
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   
823.
824.
The predicted increase in unconventional gas production is set to change global energy and concomitant geopolitical relations. The scale and required infrastructure of unconventional gas extraction result in profound changes in the landscape where extraction and processing take place. Widespread public concerns about the impacts of this industry have emerged, particularly with regard to fracking, surface and subterranean water contamination, air pollution and a host of other environmental issues, as well as social impacts and health risks. This article sets out some of the emerging anthropological engagements with unconventional gas and fracking, including analyses of materiality, politics, discourses, rights, risk and knowledge.  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