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   720篇
  免费   20篇
  2020年   9篇
  2019年   23篇
  2018年   16篇
  2017年   31篇
  2016年   27篇
  2015年   15篇
  2014年   15篇
  2013年   280篇
  2012年   15篇
  2011年   17篇
  2010年   20篇
  2009年   12篇
  2008年   17篇
  2007年   13篇
  2006年   11篇
  2005年   11篇
  2004年   8篇
  2003年   13篇
  2002年   6篇
  2001年   9篇
  1999年   3篇
  1998年   7篇
  1995年   9篇
  1994年   4篇
  1993年   3篇
  1992年   6篇
  1991年   5篇
  1990年   4篇
  1989年   4篇
  1988年   5篇
  1987年   4篇
  1985年   7篇
  1984年   5篇
  1983年   4篇
  1981年   11篇
  1980年   6篇
  1979年   11篇
  1978年   3篇
  1977年   7篇
  1976年   8篇
  1975年   8篇
  1973年   4篇
  1972年   5篇
  1971年   3篇
  1970年   3篇
  1966年   3篇
  1964年   2篇
  1959年   2篇
  1958年   4篇
  1956年   2篇
排序方式: 共有740条查询结果,搜索用时 31 毫秒
101.
The Nene Valley, in eastern central England, was a major pottery production centre in the Roman period. Many kiln sites have been identified in the Lower Nene Valley region and, although comparatively less is known about production in the Upper Nene Valley, substantial amounts of mortaria and other coarse wares have been recovered during excavations at Roman sites in the area, and much of it is thought to be locally made. However mortaria made in the Upper and Lower Nene Valley can be difficult to tell apart, and many also have similar forms and fabrics to mortaria produced in Mancetter–Hartshill, Warwickshire. Therefore ICP analysis was used in an attempt to identify the products of different regions.  相似文献   
102.
X-ray fluorescence analysis of obsidian artifacts from sites located in Chaco Canyon and from three Chaco-era communities in New Mexico permits determination of their geological origin. These source data are used to describe patterning in obsidian procurement in sites located in Chaco Canyon dating from A.D. 500–1150, and in a three non-Canyon communities occupied during the period of Chaco Canyon's regional prominence (ca. A.D. 875–1150). These data demonstrate that the most proximate sources generally dominate the sourced obsidian assemblages from sites of all periods, but also suggest differences in procurement patterning both over time and across space. Within Chaco Canyon, there is a notable shift from Mount Taylor obsidian to use of Jemez Mountains sources over time. These data also suggest that earlier analyses of obsidian from sites in Chaco Canyon misidentified some obsidian artifact sources; these new data indicate the central areas of disagreement and provide a revision of procurement patterning. In the Chaco-era communities located outside Chaco Canyon, procurement patterning diverges. The Blue J community shows an increase in use of the nearby Mount Taylor source over time. Two communities located toward the southern extent of the Chaco great house distribution reveal a markedly distinct procurement pattern, obtaining nearly all of their obsidian from southern sources largely unrepresented at Chaco Canyon. Combined, these data provide new insights into raw material procurement and artifact production at sites in Chaco Canyon, and in communities occupied during the Chaco Phenomenon, the period of the Canyon's greatest regional influence.  相似文献   
103.
Tin, as a constituent of bronze, was central to the technological development of early societies, but cassiterite (SnO2) deposits were scarce and located distantly from the centres of Mediterranean civilizations. As Britain had the largest workable ore deposits in the ancient Western world, this has led to much historical speculation and myth regarding the long-distance trading of tin from the Bronze Age onwards. Here we establish the first detailed chronology for tin, along with lead and copper deposition, into undisturbed ombrotrophic (rain-fed) peat bogs located at Bodmin Moor and Dartmoor in the centre of the British tin ore fields. Sustained elevated tin deposition is demonstrated clearly, with peaks occurring at 100–400 and 700–1000 calendar years AD – contemporaneous with the Roman and Anglo-Saxon periods respectively. While pre-Roman Iron Age tin exploitation undoubtedly took place, it was on a scale that did not result in convincingly enhanced deposition of the metal. The deposition of lead in the peat record provides evidence of a pre-Roman metal-based economy in southwest Britain. Emerging in the 4th century BC, this was centred on copper and lead ore processing that expanded exponentially and then collapsed upon Roman colonization during the 1st century AD.  相似文献   
104.
Magnetometry has been little used on Arctic archaeological sites, but has great potential to help us understand site structure by identifying buried features and providing additional detail about the construction and use of visible surface features. In the Arctic environment, magnetometer surveys have to deal with the effects of permafrost activity on soils and the potential influence of glacial erratics of varying geological composition. Here, we present the results of magnetometer surveys of a non-cultural site with periglacial features and two archaeological sites located in the Canadian low Arctic. Despite considerable “noise” apparently caused by igneous erratics, the surveys successfully identified several frost features and a range of archaeological feature types. They also appear to have located buried archaeological features and identified activity areas within some dwellings. These preliminary results suggest that the technique is worth pursuing on northern sites.  相似文献   
105.
106.
107.
Gordon Morgan Holmes, MD, MRCP was an Irish born neurologist who received his medical education at Trinity College, Dublin, Ireland. He was trained in neuroanatomy and neuropathology at the Senckenberg Institute, Frankfort-Am-Main by Ludwig Edinger. He then returned to serve as a Registrar (House Officer) mentored by Richard Gowers and John Hughlings Jackson at the National Hospital, Queen Square, London. He collaborated with Thomas Granger Stewart in describing the loss of recoil in patients with cerebellar hemispheric tumors in 1904. Volunteering in 1914 for frontline hospital duty, he examined soldiers who had injuries to their occipital area causing hypotonia, dysmetria, staggering gait, and falling to the side ipsilateral to their injured cerebellar hemisphere. Holmes discovered that increasing the pace of the finger-nose manuever and applying slight resistance to a moving limb attenuated the dysmetria. Continuing observation of these patients afforded him to describe the evolution of their injuries to include increasing tremor and decreasing hypotonia. Holmes first attached levers to the limbs of hispatients to record their movements on a moving smoked paper kymograph. In 1939 he published photograh tracings made by low mass minature light bulbs attached to ataxic limbs that showed thehpometira and hypometria of their movements ipsilateral to their damaged cerebellar lobes. Holmes made sigficant contributions to understanding of the physiology of the human cerebellum.  相似文献   
108.
109.
110.
Research article     
The Peace Mission Movement, an American intentional religious community founded by the Revd M. J. Divine, also known as “Father Divine,” expressed through an intentional use of architecture their own quest for a utopian perfection of consciousness in America. What is especially significant about this expression of perfection is that they did not seek it by building environments of their own creation. Instead, the movement and its leader created a unique religious vernacular architecture not by architectural design, but by a spiritualised appropriation of existing spaces. Through purchasing, restoring, re‐using, and preserving many different types of American domestic and commercial structures, Father Divine and his followers developed a theology of material culture and historic preservation that expressed a major theological perspective of their belief system—to spiritualise the material and to materialise the spiritual—all in the service of God and for the transformation of human nature.  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