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   175篇
  免费   1篇
  176篇
  2024年   1篇
  2020年   2篇
  2019年   5篇
  2018年   9篇
  2017年   7篇
  2016年   9篇
  2015年   3篇
  2013年   24篇
  2012年   35篇
  2011年   4篇
  2010年   12篇
  2009年   8篇
  2008年   16篇
  2007年   5篇
  2006年   6篇
  2005年   3篇
  2004年   5篇
  2003年   4篇
  2002年   3篇
  2001年   3篇
  1998年   1篇
  1995年   2篇
  1993年   1篇
  1991年   1篇
  1983年   1篇
  1981年   2篇
  1980年   3篇
  1978年   1篇
排序方式: 共有176条查询结果,搜索用时 15 毫秒
1.
2.
The goal of this research is to explore status-based differences in diet of the peasants, monks and elites interred at the medieval Cistercian monastery of Øm Kloster. In order to accomplish this task bone samples were taken from 98 individuals from the monastery for the stable isotopic analysis of carbon and nitrogen found in both bone collagen and apatite. Significant differences were found in the diet of these three groups. Elites demonstrated significantly enriched δ15N and δ13C values and had the smallest δ13Ccoll-ap spacing in comparison to the peasant and monastic population. Although there were no changes in the diet of the elite or peasant population through time, the monastic diet shifted from resembling the diet of the peasant population early in the period to more closely matching that of the elites at the close of the period, although small sample size precluded the significance testing of this shift. This research suggests that social status played a considerable role in the types and quantity of food resources available to a given individual in society and that there were some socially based differences in the medieval Danish diet.  相似文献   
3.
The analysis of environmental archives from across the world has demonstrated that human perturbation of the geochemical cycles of trace metals and the resultant atmospheric metal contamination date back, at least, several millennia. However, an understanding of the local processes and timing of changes in trace metal deposition is also essential for a proper global interpretation. The Iberian Peninsula was a major mining area since prehistoric times and the analysis of environmental archives provides a good opportunity to improve our understanding of the history of mining and metallurgy in Europe. We present the results from three 14C dated peat cores from the Xistral Mountains (NW Iberia). These records are used to reconstruct past atmospheric deposition of Ni, Zn, As, and Cd. The chronology of the changes in concentrations and metal accumulation rates was found to be concordant in the three bogs, and showed great similarity to total Pb, Hg, and Pb isotope ratios as determined in previous investigations. They present a consistent view of changes in atmospheric pollution and the importance of metals in the development of human societies, especially: i) the first evidence of atmospheric metal pollution 3400 years ago, which is simultaneous with the expansion of the Atlantic Bronze Koine; ii) a pollution event between 2350 and 2150 years ago, associated to the development of so-called Celtic culture (local Late Iron Age); iii) a dramatic increase of metal fluxes in Roman times; iv) a severe and rapid increase in the last 250 years corresponding to the beginning of the industrial revolution in Europe, reflecting the emergence of the new dominant sources of pollution, and v) the increase of long range atmospheric transport of pollutants. Our data suggest that all detected ancient (until ca. 1450 cal BP) periods of enhanced Ni, Zn, As, and Cd accumulation may have had an anthropogenic origin, related to the onset and development of mining and metallurgy.  相似文献   
4.
中世纪英格兰运输役起源于庄园领主的物资供应需求,随着12、13世纪市场的激增以及运输条件的改善,市场型运输役逐渐普及。运输役一般由农民上层承担,其运输距离、目的地、运输种类等都受习俗制约。运输役衰落的原因主要有直营领地的衰落、运输的专职化以及私下交易的流行。运输役的兴衰与中世纪英格兰市场培育密切相关,是市场已有一定发育但还不太成熟的产物。  相似文献   
5.
6.
This article accounts for the hitherto unexplained increase in the availability of ivory in mid-thirteenth-century France through an alteration in the medieval trade routes that brought elephant tusks from Africa to northern Europe. A newly-opened passage through the Straits of Gibraltar allowed a small amount of luxury goods to be shipped together with bulk materials necessary to the flourishing textile industries of northern Europe.  相似文献   
7.
    
The reliability of Marco Polo's famous travel account has been challenged time and again. It is all the more important, therefore, to submit the sparse documentary sources offering direct and incontrovertible evidence about him and his close relatives to a thorough examination. Once these documents are inserted within their contemporary context, they enable a partial reconstruction of the economic activities conducted by two generations of the Polo family before, after, and in connection with the journeys of their members in Asia. They also shed new light upon Marco Polo's personality, lifestyle, wealth, and place in Venetian society, and substantially enhance the authenticity of his travel account.  相似文献   
8.
    
  相似文献   
9.
Matthew Paris was one of the most prolific and influential historians of the central middle ages. Matthew's significance rests both on the range of his interests and the scope of his writing. Yet, even basic questions about his outlook on writing, his concept of history, or the relationship with his audience, have hardly been asked. These issues are central themes of this article, and will be used to consider wider questions about Matthew's concept of truth, his handling of information, and his view of the world around him. The article, furthermore, extends coverage beyond the Chronica majora or Matthew's vernacular writings to consider his concept of history as it emerges from the totality of his oeuvre.  相似文献   
10.
Radiocarbon dates on marine shells have not been used as extensively as charcoal or bone dates for the setting up of absolute chronologies because interpreting these dates is complicated by the marine radiocarbon reservoir effect. Nevertheless marine shellfish were used widely at least during the Holocene and their shells are abundant and usually well preserved in archaeological deposits located near shorelines. Consequently prior research concerning the oceanographic conditions and the marine radiocarbon reservoir effect of a particular coastal area is needed in order to set up reliable chronologies for that region. Values of regional marine radiocarbon reservoir effect – ΔR – of coastal waters off Atlantic Iberia, some of its variability along the Holocene and its correlation with the upwelling phenomenon were determined during previous research. More data related to the ΔR values for western Portuguese coastal waters during the Late Neolithic and the Chalcolithic, a time interval badly sampled in previous research, were recently obtained. These values can be compared with ΔR values already determined for the Gulf of Cadiz. Besides the importance of these values for a better knowledge of the palaeoceanography and palaeoclimatology of Atlantic Iberia, from now on archaeologists can set up reliable chronologies for Late Neolithic and Chalcolithic contexts using marine shell samples of that origin for radiocarbon dating.  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