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   659篇
  免费   3篇
  662篇
  2023年   6篇
  2022年   6篇
  2021年   4篇
  2020年   27篇
  2019年   27篇
  2018年   17篇
  2017年   29篇
  2016年   25篇
  2015年   22篇
  2014年   10篇
  2013年   78篇
  2012年   27篇
  2011年   37篇
  2010年   30篇
  2009年   33篇
  2008年   33篇
  2007年   35篇
  2006年   36篇
  2005年   33篇
  2004年   23篇
  2003年   36篇
  2002年   18篇
  2001年   13篇
  2000年   11篇
  1999年   7篇
  1998年   1篇
  1997年   3篇
  1996年   2篇
  1995年   2篇
  1994年   6篇
  1993年   4篇
  1992年   2篇
  1988年   1篇
  1986年   1篇
  1985年   4篇
  1984年   1篇
  1983年   3篇
  1982年   1篇
  1981年   2篇
  1980年   3篇
  1979年   2篇
  1978年   1篇
排序方式: 共有662条查询结果,搜索用时 0 毫秒
21.
The concentrations of two major elements and thirteen trace elements in 73 selected sherds of fine grey ware from the Iron Age and Roman period, excavated at Conimbriga, Santa Olaia and Tavarede, Portugal, were determined by instrumental neutron activation analysis. These concentrations were used to calculate distance matrices which were then subjected to cluster analysis employing SAHN and k-means methods, as well as to principal components analysis, to group the sherds according to the overall similarity of their compositional characteristics. The results showed that equivalent groupings appeared regardless of the taxonomic method used. Two major clusters were recognized corresponding to two different sites, namely Conimbriga and Santa Olaia, suggesting that the ceramics from these sites were made locally. No significant differences in compositional patterns were observed between iron age and roman sherds from Conimbriga.  相似文献   
22.
    
This study reports on the use of a proportional measure to estimate the age‐at‐death distribution of an assemblage and, when combined with a seriation method, additionally estimate the age‐at‐death of individuals. Traditional methods of estimating age‐at‐death suffer from a number of issues, including decreasing accuracy with increasing age, age mimicry of the reference population, and difficulty balancing accuracy with precision. A new method is proposed for estimating the age‐at‐death distribution of middle and older adults. As the age‐at‐death distribution is significantly impacted by the fertility rate, it was hypothesised that the D0‐14/D ratio (the number of individuals who died aged 0–14 years divided by the total population; an indicator of fertility) may be able to estimate the proportion of individuals that might be expected to die in each five‐year age group over 35 years. The method permits the estimation of individual age when used in conjunction with seriation methods and the age‐at‐death distribution of a population. The method is tested on two samples of known age, the Spitalfields crypt and St Thomas' Church cemetery collections and found to provide greater accuracy over previously applied methods.  相似文献   
23.
24.
    
Attempts to extend methods for dating archaeological bones beyond that of radiocarbon dating, such as amino acid racemization, have met with limited success owing to the dependence on multiple environmental factors and controls. Despite facing similar challenges, deamidation of glutamine has recently been investigated as a potential indicator of ‘thermal age' in archaeological bones, as well as a measure of their preservation quality. In this study, we undertook a series of simulated diagenetic experiments to understand the various factors affecting deamidation. Further, we analysed bones from different Middle Palaeolithic layers from Grotte Mandrin (France), with the results suggesting potential use of deamidation for relative dating, but only in case of extremely well‐preserved layers. The results also suggested the possible use of attenuated total reflectance‐Fourier transform infrared (ATR‐FTIR) spectroscopy as a screening test for soluble collagen before proteomic analysis.  相似文献   
25.
26.
This article is concerned with early modern interpretations of Hanno the Navigator's Periplus, an ancient travel account of a Carthaginian voyage down the coasts of Africa. The early modern period saw a rise in interest in geographical knowledge, and the ways in which different authors used Hanno's voyage reflects their understanding of the role of geography in conceptualising the world. In these discussions, writers had to negotiate between the confusing portrayals of the voyage in the received classical tradition and new reports brought by voyages of exploration. Here, I will discuss how these syntheses between humanist methods and contemporary travellers' accounts were shaped by the economic and political concerns tied to the first wave of European overseas expansion. Amid this climate, ancient geographical knowledge found pragmatic applications in contemporary issues of navigation, commerce and claims of territorial possession, as well as shaping European perceptions of ‘self’ and ‘the other’. This paper thus seeks to situate humanist practices and classical knowledge within the wider context of overseas voyages and early modern political and economic developments.  相似文献   
27.
This article analyses a collection of 26 watercolour drawings which portray ethnographic types from the Americas, Asia, and Africa. These drawings, presently kept at the British Library, were made for John Locke by his servant Sylvester Brounower during Locke’s exile in the Netherlands in the 1680s.  相似文献   
28.
    
The idea of cartography as an example of Western imposition or process of cultural transfer is one that has long fascinated scholars interested in the margins of empires. This article analyses the maps in the possession of Manuel Agote, a Spanish factor in Canton at the end of the eighteenth century. The focus is on the use made by Agote of a Chinese map of Hainan, together with the European maps available already in China for commercial interests, and the way this reflects the cultural dialogue that was operating among local and foreign cartographers engaged in similar European mapping activities in the region.  相似文献   
29.
ABSTRACT

In this article I introduce how the 2008 financial crisis appears in the Spanish recent drama. Although the impact of the crisis has been studied in other genres and artistic expressions such as narrative, poetry, or comics, this issue needs more attention in Spanish contemporary drama. The article proposes a critical analysis of Nada que perder (Bazo, Romero, and Yagüe, 2016). In this play, we can observe a new perspective of the crisis that not only holds the ruling class responsible for the situation, but also charges the ordinary people with irresponsibility and lack of public conscience.  相似文献   
30.
    
We present experimental data examining the energetics and identification of axial bipolar reduction in contexts of lithic miniaturization on milky quartz. These experiments answer two specific questions. First, does bipolar reduction provide any benefits over freehand reduction? Second, can axial bipolar reduction be distinguished from freehand reduction? Our data show that bipolar reduction requires significantly less time to reduce a percentage unit of core mass and to produce a millimeter of cutting edge on milky quartz than freehand reduction. Milky quartz bipolar reduction surpasses even the cutting edge production efficiency of obsidian pressure blades. We outline a series of quantitative criteria for identifying bipolar cores and flakes. Our results show that bipolar cores and flakes can be distinguished from those produced using freehand reduction by quantifying platform crushing, distal flake rebound scars, bulb shearing, as well as axial, bipolar, and splintered flake terminations. Our results challenge the widely held perceptions about the wastefulness of bipolar reduction and provide clear guidelines for identifying this reduction strategy in archaeological milky quartz assemblages.  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