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   4612篇
  免费   204篇
  2020年   70篇
  2019年   87篇
  2018年   116篇
  2017年   121篇
  2016年   145篇
  2015年   94篇
  2014年   102篇
  2013年   1396篇
  2012年   114篇
  2011年   149篇
  2010年   129篇
  2009年   122篇
  2008年   114篇
  2007年   97篇
  2006年   102篇
  2005年   54篇
  2004年   75篇
  2003年   62篇
  2002年   57篇
  2001年   72篇
  2000年   42篇
  1999年   49篇
  1998年   37篇
  1997年   41篇
  1996年   33篇
  1995年   44篇
  1994年   45篇
  1993年   47篇
  1992年   43篇
  1991年   31篇
  1990年   36篇
  1989年   31篇
  1988年   43篇
  1987年   41篇
  1986年   43篇
  1985年   43篇
  1984年   64篇
  1983年   51篇
  1982年   44篇
  1981年   50篇
  1980年   49篇
  1979年   47篇
  1978年   48篇
  1977年   45篇
  1976年   45篇
  1975年   30篇
  1974年   30篇
  1973年   38篇
  1972年   35篇
  1969年   28篇
排序方式: 共有4816条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
77.
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   
78.
A major theme of current archaeological research in the Middle Atlantic region of Eastern North America is the recognition of cultural variability across space and through time. The most significant culture change experienced during the entire time frame of regional prehistory occurred ca. 5000 B.P., when there were major changes in regional environments. Before 5000 B.P., adaptations were characterized by small groups of mobile hunters and gatherers. After 5000 B.P., there were continued growth in regional populations and increases in sedentism, intensive use of a limited range of food resources, social group size, and social complexity.  相似文献   
79.
80.
Discriminant analyses of distances and angles obtained from 25 coins struck by P. Crepusius in 82 BC permitted the correct chronology for five groups of closely-related dies to be obtained by the method of Carter and Frurip. Twenty distances and 15 angles were measured on 10 x projections of the coins which represented five groups of dies separated in time from each other. The use of all or many variables gave poorer results than the use of five to ten variables having a high ‘figure of merit’, defined as the maximum range of mean values for a given variable in the five groups of dies divided by the mean standard deviation of the variable in the five groups. It is recommended that chronologies of ancient coins be determined from Mahalanobis distances by using only variables of relatively high figure of merit.  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