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   663篇
  免费   27篇
  690篇
  2023年   2篇
  2020年   9篇
  2019年   27篇
  2018年   21篇
  2017年   34篇
  2016年   26篇
  2015年   16篇
  2014年   17篇
  2013年   265篇
  2012年   17篇
  2011年   16篇
  2010年   18篇
  2009年   7篇
  2008年   17篇
  2007年   16篇
  2006年   8篇
  2005年   10篇
  2004年   8篇
  2003年   13篇
  2002年   3篇
  2001年   10篇
  2000年   4篇
  1998年   7篇
  1996年   3篇
  1995年   4篇
  1993年   3篇
  1992年   2篇
  1991年   5篇
  1990年   4篇
  1989年   5篇
  1987年   3篇
  1986年   2篇
  1985年   8篇
  1984年   2篇
  1983年   2篇
  1982年   2篇
  1981年   8篇
  1980年   7篇
  1979年   10篇
  1978年   3篇
  1977年   5篇
  1976年   5篇
  1975年   7篇
  1973年   2篇
  1972年   5篇
  1971年   2篇
  1970年   2篇
  1968年   2篇
  1966年   2篇
  1948年   2篇
排序方式: 共有690条查询结果,搜索用时 15 毫秒
101.
102.
This paper considers the ideals and activism of the fin de siècle feminist organisation, the Women's Emancipation Union (WEU). Active between 1891 and 1899, the WEU held a prophetic vision of the future and an appraisal of women's subjection more comprehensive than any contemporary feminist group. Members were the first to link the possession by women of their bodily autonomy directly to the acquisition of the parliamentary vote, and thus redefined the terms upon which citizenship was constructed. One member raised the matter of armed insurrection in support of the women's franchise, an issue which would have serious implications for the future of suffragist campaigns. The political roots of WEU members lay chiefly within the utopian‐socialist and Radical‐liberal traditions, but it was an organisation which resisted party‐political allegiance to become anchored in the Progressive movement. Adopting what has been defined as the ‘muckraking’ tradition associated with Progressive authorship, the WEU suffragists constructed a rhetoric of resistance to women's subjection from social, sexual, economic and political standpoints. Many points they raised, including for a woman's right to consent to maternity to be enshrined in law, were to become the bedrock of the philosophy of the militant suffragette movement.  相似文献   
103.
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   
104.
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   
105.
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   
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.
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