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   1590篇
  免费   19篇
  1609篇
  2024年   1篇
  2023年   2篇
  2021年   1篇
  2020年   7篇
  2019年   13篇
  2018年   302篇
  2017年   205篇
  2016年   244篇
  2015年   18篇
  2014年   14篇
  2013年   38篇
  2012年   33篇
  2011年   171篇
  2010年   184篇
  2009年   47篇
  2008年   78篇
  2007年   140篇
  2006年   3篇
  2005年   34篇
  2004年   9篇
  2003年   6篇
  2002年   5篇
  2001年   1篇
  2000年   2篇
  1999年   6篇
  1998年   4篇
  1997年   2篇
  1996年   2篇
  1995年   2篇
  1993年   1篇
  1992年   1篇
  1991年   3篇
  1989年   1篇
  1987年   1篇
  1986年   2篇
  1985年   3篇
  1984年   2篇
  1983年   3篇
  1981年   1篇
  1980年   2篇
  1979年   1篇
  1978年   2篇
  1977年   2篇
  1976年   4篇
  1975年   1篇
  1974年   1篇
  1970年   2篇
  1966年   1篇
  1965年   1篇
排序方式: 共有1609条查询结果,搜索用时 0 毫秒
991.
This paper is an attempt at defining the social functions of the unchambered megalithic long barrows found in the ?upowa group of the Funnel Beaker Culture (TRB). The authors assume that their aim can be achieved by employing a cultural ecological approach, which leads to a determination of the following variables: exploitation efficiency of the local population, local territory, and size of that population. The values determined for these variables imply that only a small, limited number of the deceased members of the group were buried in the long barrows discussed. Thus, it is possible that burial functions were not the only and most important ones. The authors try to define the remaining functions of the long barrows.  相似文献   
992.
993.
Extraterrestrial events and the extraterrestrial origin of both material and impact forms were recognized in the Morasko, Kaali and Przełazy shallow geological profiles by means of luminescence and radiocarbon dating as well as the frequency of magnetic spherules. The obtained results provide a promising tool for proving theat extraterrestrial events affected characteristic lithological and morphological environmental features.  相似文献   
994.
995.
Studies of the feeding ecology of the European wildcat (Felis silvestris silvestris) demonstrate that leporids, mostly European rabbit (Oryctolagus cuniculus), dominate their diet in regions where they are present. The remains of wildcats have been found at Pleistocene and Holocene archaeological sites, raising the possibility that they actively accumulated leporid bones in caves and shelters shared with other terrestrial carnivores, raptors and humans. We present the first taphonomic study of rabbit remains consumed by this terrestrial carnivore, with the ultimate aim of understanding their role in bone accumulations at archaeological sites. An experimental study was carried out with a wildcat female, who was fed with nine complete rabbit carcasses. Non-ingested remains and scats were recovered for the analysis of anatomical representation, breakage and bone surface modification. This revealed that non-ingested remains and scats of the European wildcat can be discriminated from most other agents of accumulation. The referential framework provided will permit the discrimination of hominids and wildcats as agents of fossil accumulations of rabbits.  相似文献   
996.
Research into the processing of marine resources along the Mediterranean coasts in antiquity reveals an uneven picture. The archaeological evidence for the systematic processing of fish and seafood in the western part is abundant and varied. Here, the production of salted fish and fish sauces seems to have been an important factor contributing to economic growth in many locations. In the eastern part of the Mediterranean, however, archaeological evidence for the processing of marine resources is much less common and is often indirect. Large-scale processing plants are virtually absent from the archaeological record and there are few studies of the remains of fish and shellfish or of other material evidence relating to fish preservation and commerce. Yet written evidence on the subject abounds, but places heavy emphasis on consumption and commerce rather than production. This paper describes the evidence and explores possible reasons for this imbalanced representation in an attempt to assess the actual importance of the processing of marine resources across the whole Mediterranean region. Issues discussed are the shifting emphasis on fish processing across space and through time, archaeological research agendas and methodologies, resource availability and abundance and, finally, issues of scale and visibility.  相似文献   
997.
The Gumugou Cemetery is located in the Lop Nor region of the Tarim Basin in Xinjiang, northwest China. Radiocarbon dating found the site to be 3800 years BP. Due to the exceptionally arid conditions, most of the plant remains are well-preserved. Morphological and anatomical studies suggest that the plant remains consist of: Triticum cf. aestivum, Phragmites australis, Populus euphratica, Ephedra sp., as well as Typha sp. These ancient plants imply that the indigenous people lived in oases surrounded by extensive desert. Caryopses of T. cf. aestivum might have been used as funeral objects of the mummies as well as a subsidiary food source of the inhabitants, while the wild plants were used in other aspects of daily life.  相似文献   
998.
At the end of the Neolithic Era, during the third millennium BCE, there were fewer humid periods, and the sub-Saharan and Sahelian zones from the Atlantic to Lake Chad assumed their current geographical form. Since then, the climate has continued undergoing major variations. The succession of climatic episodes, humid or dry, is pointed out along with the episodes’ complex interactions. These variations are placed in parallel to cultural phases of evolution in archaeology and history. Climate-related events have always had heavy consequences on the peopling of this vast region, often subject to extreme natural conditions. The relative synchronism between the principal cultural trends from west to east across the Sahel seems to have often been subject to swings in the climate and the resulting environmental changes.  相似文献   
999.
1000.
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