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   297篇
  免费   18篇
  2020年   2篇
  2019年   2篇
  2018年   14篇
  2017年   20篇
  2016年   17篇
  2015年   10篇
  2014年   4篇
  2013年   92篇
  2012年   9篇
  2011年   10篇
  2010年   9篇
  2009年   7篇
  2008年   10篇
  2007年   7篇
  2006年   5篇
  2005年   2篇
  2004年   6篇
  2003年   6篇
  2002年   7篇
  2001年   5篇
  2000年   7篇
  1999年   2篇
  1998年   7篇
  1997年   1篇
  1996年   3篇
  1995年   4篇
  1994年   3篇
  1993年   3篇
  1992年   3篇
  1991年   3篇
  1990年   3篇
  1989年   1篇
  1988年   1篇
  1987年   2篇
  1985年   3篇
  1984年   2篇
  1983年   1篇
  1982年   1篇
  1981年   2篇
  1980年   1篇
  1979年   3篇
  1977年   1篇
  1976年   3篇
  1975年   2篇
  1973年   1篇
  1971年   1篇
  1969年   1篇
  1956年   1篇
  1952年   1篇
  1950年   1篇
排序方式: 共有315条查询结果,搜索用时 0 毫秒
81.
Many of the sediments analysed from Tel Dor (Israel) show structural alterations indicating that they were exposed to high temperatures. This observation is consistent with the abundant evidence for use of pyrotechnology from the earliest exposed Middle Bronze Age strata through the Roman period. Such structurally altered sediments may well represent one of the more widespread and durable records of pyrotechnology, and as such could be invaluable for reconstructing past human activities. The specific aims of this research are therefore to develop the means for identifying local sediments that were altered by different pyrotechnological activities and to elucidate the varying circumstances whereby sediments were exposed to high temperatures in a Late Bronze and Iron Age 1 section.  相似文献   
82.
Students at Stevens Institute of Technology (Hoboken, NJ, USA) investigated the reasons for an elongated projection at the bow of Mediterranean galleys. Using a 1:20 base model adapted from the Trireme Trust's Olympias fitted with: 1) an elongated projection; and 2) a control bow similar to excavated merchant ships, tow‐tank tests were carried out at various speeds. Hydrodynamic resistance and power were calculated for each bow type. Above speeds corresponding to 6 knots, the cutwater bow significantly attenuated the model's bow waves when compared to the control bow. These results were then compared to those of the ship with a ram‐type bow from experiments conducted in 1985 at the National Technical University of Athens, which showed similar wave‐attenuating characteristics.  相似文献   
83.
84.
Airing from 1951 until 1971, ‘The Big Picture’ was the United States Army’s primary means of marketing itself to the U.S. public, particularly between the Korean and Vietnam Wars. Drawing for the first time on archival records concerning the show’s production, this paper documents how information officers sought to escape the stock-footage straightjacket embedded in the show’s origins and showcase an Atomic Age Army standing sentry at the Cold War’s ramparts. Ultimately, they fought dual losing battles against parsimonious budgets and public indifference, while their insistence on content control hampered potential exposure in more appealing prime-time entertainment programmes.  相似文献   
85.
In 1984 Eliezer Oren identified a series of structures found at 13th and 12th centuries BCE sites of southern Canaan, calling them Egyptian Governors’ Residencies. He identified Bliss’s City IV as a defining site. In 2000 Blakely identified Petrie’s Pilaster Building as a second example from Tell el-Hesi. It is now clear that Bliss’s City IV dates to the 13th century and that some of its architectural elements were salvaged after its destruction to build Petrie’s Pilaster Building in the 12th century. All of the southern examples are found in an agricultural zone of uncertainty where there is no clear likelihood of a harvestable crop in any given normal year. As it happens, the 13th and especially the 12th centuries BCE were far from normal, being a period of drought and extreme drought. Thus no crops could have been expected. This suggests the structures could not have been centres for the collection of a grain harvest tax, the accepted view. Rather, one wonders if the sites did not monitor a large pasturage.  相似文献   
86.
87.
88.
IN 1959 Mr. Dudley Waterman published the first modern summary of Anglo-Danish artifacts found in York1 and it says much for his work that very little needs adding or modifying. This paper examines some aspects of Danish York which were not discussed by Waterman and records information which throws more light on the nature of everyday life in the Anglo-Danish city. This has been made possible by the considerable advance in knowledge on a national scale of 10th- and 11th-century pottery, and by recent developments in York. Intensive study of the history, architecture and archaeology of York by investigators of the Royal Commission on Historical Monuments has developed the first tentative ideas of the nature of the city defences, and of the street plan, and has thus led to greater knowledge of its economic life.2  相似文献   
89.
90.
This study explores the interrelationship between the genus Canis and hunter–gatherers through a case study of prehistoric Native Americans in the San Francisco Bay-Sacramento Delta area. A distinctive aspect of the region's prehistoric record is the interment of canids, variously classified as coyotes, dogs, and wolves. Since these species are difficult to distinguish based solely on morphology, ancient DNA analysis was employed to distinguish species. The DNA study results, the first on canids from archaeological sites in California, are entirely represented by domesticated dogs (including both interments and disarticulated samples from midden deposits). These results, buttressed by stable isotope analyses, provide new insight into the complex interrelationship between humans and canids in both ritual and prosaic contexts, and reveal a more prominent role for dogs than previously envisioned.  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