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   8653篇
  免费   316篇
  8969篇
  2020年   116篇
  2019年   163篇
  2018年   176篇
  2017年   221篇
  2016年   293篇
  2015年   188篇
  2014年   172篇
  2013年   2192篇
  2012年   215篇
  2011年   268篇
  2010年   238篇
  2009年   213篇
  2008年   200篇
  2007年   170篇
  2006年   161篇
  2005年   111篇
  2004年   114篇
  2003年   104篇
  2002年   114篇
  2001年   126篇
  2000年   136篇
  1999年   172篇
  1998年   114篇
  1997年   75篇
  1996年   87篇
  1995年   94篇
  1994年   91篇
  1993年   93篇
  1992年   96篇
  1991年   75篇
  1990年   75篇
  1989年   78篇
  1988年   85篇
  1987年   92篇
  1986年   86篇
  1985年   122篇
  1984年   121篇
  1983年   129篇
  1982年   99篇
  1981年   104篇
  1980年   107篇
  1979年   102篇
  1978年   94篇
  1977年   108篇
  1976年   86篇
  1975年   95篇
  1974年   83篇
  1973年   79篇
  1972年   62篇
  1971年   65篇
排序方式: 共有8969条查询结果,搜索用时 0 毫秒
131.
"A classic case where out-migration interacted with many other geographical phenomena is provided by rural Ireland in the nineteenth century. The apparent turning point was the Great Famine of the 1840s, but the areas with the greatest suffering from starvation did not necessarily show the greatest population decline, suggesting that other forces were active. Considerable economic and social changes were already taking place before the Famine: fertility was being reduced, later marriage was becoming established and considerable emigration was already taking place. Immediately after the Famine those areas which had been hardest hit often reverted to pre-Famine conditions and did not show strong population decline until the 1870s. The Famine was a most serious event, but the modernization of Irish rural life, which linked emigration with changes in family structure, agriculture and population numbers, was more important in bringing about geographical change."  相似文献   
132.
133.
134.
135.
136.
The chemical and mineralogical characterization of seven ceramic fragments produced within Tiwanaku state (c.500–1000 ce ) is reported. The instrumental techniques used included X‐ray elemental and mineralogical chemical analysis, Raman spectroscopy, and scanning and light microscopy. The results indicate there are several clay types, although they show similarities, such as the use of a plant‐based temper. The red colour of the decoration is hematite, and manganese oxides such as jacobsite are present in the black. The white colour is a mixture of gypsum and clay, and the orange is a mixture of hematite and clay. The use of colours, the quality of the clays and the temperatures reached during pottery firing point to expertise in ceramic production and to complex decision‐making processes. The multi‐elemental archaeometric approach documented here could become an important tool to shed a light on ancient ceramic technology and the internal variance of Tiwanaku pottery.  相似文献   
137.
The reasons why the Western Mediterranean, especially Carthage and Rome, resisted monetization relative to the Eastern Mediterranean are still unclear. We address this question by combining lead (Pb) and silver (Ag) isotope abundances in silver coinage from the Aegean, Magna Graecia, Carthage and Roman Republic. The clear relationships observed between 109Ag/107Ag and 208Pb/206Pb reflect the mixing of silver ores or silver objects with Pb metal used for cupellation. The combined analysis of Ag and Pb isotopes reveals important information about the technology of smelting. The Greek world extracted Ag and Pb from associated ores, whereas, on the Iberian Peninsula, Carthaginians and Republican‐era Romans applied Phoenician cupellation techniques and added exotic Pb to Pb‐poor Ag ores. Massive Ag recupellation is observed in Rome during the Second Punic War. After defeating the Carthaginians and the Macedonians in the late second century bce , the Romans brought together the efficient, millennium‐old techniques of silver extraction of the Phoenicians, who considered this metal a simple commodity, with the monetization of the economy introduced by the Greeks.  相似文献   
138.
African Archaeological Review - A set of beads made of glass, gastropod mollusk shell, and fishbone from a Swahili occupation level on Ibo Island (northern Mozambique) is dated to the eleventh and...  相似文献   
139.
During fieldwork on cancer in Kisumu, western Kenya, the author slowly began, like those around her, to ask questions about its location and its temporalities, its beginnings and endings, its boundaries and entanglements with toxicants. In this article, the author describes the landscapes of exposure that people in western Kenya associate with an increasingly visible cancer epidemic, including concerns based on partial and tentative knowledge about the toxicity of foods. Starting from conversations about cancer, home, food and toxicity, she moves towards livelihoods, economies and ecologies, and the food and agricultural systems in which these exposures and uncertainties are embedded.  相似文献   
140.
Journal of World Prehistory - From northern China, millet agriculture spread to Korea and the Maritime Russian Far East by 3500–2700 BC. While the expansion of agricultural societies across...  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