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   306篇
  免费   23篇
  2024年   1篇
  2023年   7篇
  2022年   2篇
  2021年   3篇
  2020年   8篇
  2019年   19篇
  2018年   21篇
  2017年   25篇
  2016年   25篇
  2015年   14篇
  2014年   14篇
  2013年   52篇
  2012年   8篇
  2011年   34篇
  2010年   9篇
  2009年   14篇
  2008年   9篇
  2007年   9篇
  2006年   7篇
  2005年   5篇
  2004年   5篇
  2003年   2篇
  2002年   5篇
  2001年   4篇
  2000年   2篇
  1999年   3篇
  1998年   2篇
  1997年   3篇
  1996年   4篇
  1995年   2篇
  1994年   1篇
  1993年   2篇
  1991年   1篇
  1987年   2篇
  1986年   1篇
  1983年   1篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
排序方式: 共有329条查询结果,搜索用时 15 毫秒
71.
ABSTRACT

We integrate functional weed ecology with crop stable carbon and nitrogen isotope analysis to assess their combined potential for inferring arable land management practices in (semi-)arid regions from archaeobotanical assemblages. Weed and GIS survey of 60 cereal and pulse fields in Morocco are combined with crop sampling for stable isotope analysis to frame assessment of agricultural labour intensity in terms of manuring, irrigation, tillage and hand-weeding. Under low management intensity weed variation primarily reflects geographical differences, whereas under high management intensity fields in disparate regions have similar weed flora. Manured and irrigated oasis barley fields are clearly discriminated from less intensively manured rain-fed barley terraces in southern Morocco; when fields in northern and southern Morocco are considered together, climatic differences are superimposed on the agronomic intensity gradient. Barley δ13C and δ15N values clearly distinguish among the Moroccan regimes. An integrated approach combines crop isotope values with weed ecological discrimination of low- and high-intensity regimes across multiple studies (in southern Morocco and southern Europe). Analysis of archaeobotanical samples from EBA Tell Brak, Syria suggests that this early city was sustained through extensive (low-intensity, large-scale) cereal farming.  相似文献   
72.
ABSTRACT

This paper describes the multivariate statistical model of the structure-related modelling uncertainty, developed with reference to reinforced concrete, masonry, steel, and seismically isolated buildings, within the framework of the RINTC project. The model describes the variability of material properties as well as the uncertainty associated with the adopted response models. Specific aspects of each structural typology are also discussed, with a focus on the statistical dependence of the random variables in the model. Finally, the paper describes also the efficient sampling procedure adopted. Effect of model uncertainty on response for each typology are discussed in the corresponding papers within this special issue dedicated to the RINTC project.  相似文献   
73.
74.
Considering the likely unfavorable behavior under seismic action of adobe construction, this article aims at providing a seismic fragility characterization of two adobe Portuguese traditional buildings, using numerical models calibrated over experimental results. The study of such two case-study buildings in the region of Aveiro contributes to the understanding of the seismic fragility of adobe construction in the region in general. The buildings were numerically modeled to estimate their structural behavior under seismic loading using adobe material properties that were calibrated based on the experimental results of a cyclic in-plane test of a full-scale double-Tshaped adobe wall. The method chosen to characterize adobe masonry and model its nonlinear behavior followed a total strain crack-based macro-modeling (TSCM) approach, whereas pushover analysis was carried out to reproduce the pseudo-static experimental test in order to enable a refined calibration of adobe masonry mechanical properties. Fragility functions were then derived, based on the above-mentioned numerical models, using nonlinear static analysis, bringing further insight on the seismic fragility of traditional Portuguese adobe construction.  相似文献   
75.
The heritage studies of the socialist built legacy of the former Soviet Socialist Republics have mainly concentrated on the buildings and monuments representing the political ideology of the socialist era due to their evidently controversial character, while the more mundane and ordinary legacy has seldom been the focus. The administrative buildings of collective farms represent a particular socialist architecture of the 1960s–1980s in Estonian rural areas and small towns. These prosaic buildings, which used to play important role in the Soviet-time rural life, have become a dissonant heritage today, although their controversial nature lies in the complicated contemporary environment they fell into after the collapse of the socialist regime, rather than in the fact that they were constructed for ideological purposes. This paper examines the dissonant processes and the present contexts that affect the re-use and preservation of the administrative buildings of collective farms, as well as the acceptance of them as a meaningful part of Estonian history that should not be ignored or forgotten.  相似文献   
76.
Book reviews     
The Devil in the New World: The Impact of Diabolism in New Spain. By FERNANDO CERVANTES. New Haven: Yale University Press, 1994. Pp. x, 182.

An Evil Lost to View? An Investigation of Post‐Evangelisation Andean Religion in Mid‐Colonial Peru. By KENNETH MILLS. Liverpool: Institute of Latin American Studies, University of Liverpool, Monograph Series No. 18, 1994. Pp. 147.

The Limits of Racial Domination: Plebeian Society in Colonial Mexico City, 1660–1720. By R. DOUGLAS COPE. Madison: University of Wisconsin Press, 1994. Pp. xiii, 220.

Memory, Myth, and Time in Mexico: From the Aztecs to Independence. By ENRIQUE FLORESCANO. Trans, by Albert G. Bork and Kathryn R. Bork. Austin: University of Texas Press, 1994. Pp. ix, 282.

Fuentes manuscritas para la historia de Iberoamérica. Guía de instrumentos de investigación. Por SYLVIA L. HILTON e IGNACIO GONZALEZ CASASNOVAS. Madrid: Fundación Mapfre América‐Instituto Histórico Tavera, 1995. Pp. 617.

The Town of San Felipe and Colonial Cacao Economies. By EUGENIO PINERO. Philadelphia: Transactions of the American Philosophical Society, vol. 84, 1994. Pp. 189.

Imperial Panama: Commerce and Conflict in Isthmian America 1550–1800. By CHRISTOPHER WARD. Albuquerque: University of New Mexico Press, 1993. Pp. xii, 272.  相似文献   

77.
This article examines the journey to the Mongol court by the Franciscan William of Rubruck and his unsuccessful attempts to negotiate his way through the Mongol hierarchy with gifts of food. Using William of Rubruck’s account of his journey, the Itinerarium, this article analyses the utility of gifts of food across different cultural contexts. Rubruck ultimately gained status among the Mongols through his ‘gift of self’, demonstrating how social standing can be negotiated through finding the appropriate cultural grammar for gift giving. Pervasive western medieval views on gift giving were not uncontested: alternate views of what constituted a gift existed within the broader thirteenth-century world.  相似文献   
78.
In September 1346, Edward III brought his victorious army to the gates of Calais to begin a siege that over 12 months developed into the largest military operation conducted by the English on French soil during the fourteenth century. It is also perhaps the least understood campaign of Edward III’s reign, because of the loss of the army pay records. We know from chronicles that the men of Calais conducted a heroic defence of their town, and we know too that the English created and maintained an enormous logistical operation first to besiege and then to capture the port. What is little understood, however, is the scale, scope and chronology of the siege. The role played by English naval forces has received little attention, yet there is a series of pay records relating to their service which can compensate for the loss of the vadia guerre accounts and which can enrich understanding of the campaign. Using this evidence, this article reappraises the whole expedition, highlights the numbers of ships and mariners involved in the siege, and draws attention to periods of intensive military activity. Edward III’s ultimate objective was to capture, hold and use the town as a safe port of disembarkation for future invasions.  相似文献   
79.
Arthur's refusal to begin feasting before he has seen a marvel or heard a tale of adventure is a recurring motif in medieval romance. Previous comment on this ritual has suggested that the source for such a taboo on eating may be found in earlier narratives in the Celtic languages. This paper argues that, although the ritual almost certainly originates in pre-chivalric society, romance authors adapted and developed it to reflect the courtly-chivalric preoccupations of their own world. Arthur's ritual gesture may be seen as a means of containing and controlling both interior moral threats and exterior physical peril, and is intimately connected to the courtly conception of the feast. This study draws on the evidence of religious writing and courtesy manuals and explores some highly-developed treatments of the motif in romance in order to suggest that literary engagements with Arthur's refusal to eat have much to say about contemporary ideas of ritual and reality as mediated through the symbolically-charged arena of the medieval feast.  相似文献   
80.
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