全文获取类型
收费全文 | 4612篇 |
免费 | 204篇 |
出版年
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.
F. Albarde J. Blichert‐Toft F. de Callataÿ G. Davis P. Debernardi L. Gentelli H. Gitler F. Kemmers S. Klein C. Malod‐Dognin J. Milot P. Tlouk M. Vaxevanopoulos K. Westner 《Archaeometry》2021,63(1):142-155
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.
Jay F. Custer 《Journal of Archaeological Research》1994,2(4):329-360
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