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排序方式: 共有497条查询结果,搜索用时 31 毫秒
61.
Steve Boreham Chantal Conneller Nicky Milner Barry Taylor Andrew Needham Julie Boreham Christopher J. Rolfe 《Journal of archaeological science》2011
This paper presents the results of a project aimed at investigating the deterioration of organic remains at the Mesolithic site of Star Carr. Analyses of pH, Electrical Conductivity and Redox Potential are reported from borehole transects across the unexcavated part of the site. A comparison of field and laboratory measurements is made, leading to the characterisation of different preservation zones and identification of ‘vulnerable’ sediments at the site. These data are augmented by geochemical analyses of contemporary borehole sequences and adjacent historic monoliths. Analysis of surface water and groundwater has also been undertaken to assist in the interpretation of the site hydrology and geochemistry. The relationship between ‘natural’ geology and preservation potential, and the evidence for a ‘halo’ preservation effect in virgin sediments adjacent to previous archaeology trenches is investigated. 相似文献
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考古与遗址公园——国家考古遗址公园建设中的两个定位 总被引:2,自引:0,他引:2
国家考古遗址公园是近年来我国大遗址保护的一种创新模武.在建设过程中,我们既要正确理解国家考古遗址公园的定位,处理好"考古遗址"与"公园"之间的关系,确保考古遗址公园的特质属性和发展走向,也要全面准确把握国家考古遗址公园中考古工作的定位.这种正确的定位有利于考古遗址的科学保护、深入研究及有效展示,同时也有助于推动中国现代... 相似文献
64.
大遗址保护与考古遗址公园建设初探——以大明宫遗址保护为例 总被引:2,自引:0,他引:2
考古遗址公园建设是中国特色的文化遗产保护模式,是大遗址保护实践和国内外文化遗产保护理论结合的有益探索,也是目前最具现实意义和操作性的一种大型遗址保护途径。大明宫遗址公园是我国首批国家考古遗址公园之一,其建设以科学规划为基础,以考古发掘资料为支撑,对大明宫范围内的多处遗址进行了较科学、完整的保护展示,并因地制宜制定了绿化方案。目前大明宫遗址的保护已逐步走向成熟,其组织规划及运营管理等方面的经验为考古遗址公园建设提供了有益的借鉴。 相似文献
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P. Suhadolc L. Moratto G. Costa P. Triantafyllidis 《Journal of Earthquake Engineering》2013,17(4):560-581
In Turkey, with the occurrence of almost every strong and even moderate earthquake, damage to masonry minarets is observed. In the present work, efficiency of vertical post-tensioning application to reinforce masonry minarets against earthquakes has been investigated. Considering a representative minaret and its post-tensioned counterpart, and performing spectral and time-history analyses, the effects of post-tensioning on the axial stresses, top lateral displacements and overturning safety have been determined. Obtained results have shown that vertical post-tensioning application is a very efficient method to reduce axial tensile stresses and lateral displacements, and to assure the overturning safety of masonry minarets against earthquakes. 相似文献
67.
Alessandro Pagliaroli Giuseppe Lanzo Beniamino D'Elia 《Journal of Earthquake Engineering》2013,17(3):404-432
Numerical site response analyses were carried out on the Nicastro ridge in Southern Italy in order to investigate topographic effects. First, the analyses were carried out on a simplified model by employing simple artificial signals, in order to get preliminary physical insights into the two-dimensional phenomena involved. Then, numerical analyses were carried out on a more realistic heterogeneous subsoil model developed on the basis of geotechnical and geophysical investigations. Real accelerograms were selected for these analyses. Particular attention was devoted to separating topographic from stratigraphic amplification. Finally, the topographic amplification factors were compared with literature data and Eurocode 8 recommendations. 相似文献
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Mario Wiesendanger 《Journal of the history of the neurosciences》2013,22(1):42-57
This article addresses early work on partial recovery that followed small motor cortical lesions. Leyton and Sherrington (1917) studied the motor cortex in apes, hoping to learn more about the contralateral muscle representations. Then they placed small lesions within the precentral cortex, followed by a loss of the contralateral muscle twitches. The sudden loss remained for about one week, but recovery was observed and continued for weeks, up to a standstill. Sherrington and Graham Brown (1913) observed the same results in a serial, chronic experiment on a chimpanzee. The brain was sent to Monakow's Brain-Institute in Zurich for investigating the lesions and the degeneration pattern. Constantin von Monakow (1853–1930) had been a pioneer on recovery after acute lesions, coining the term “diaschisis.” During WWI, Graham Brown and Stewart (1916) studied a soldier in a British army hospital who suffered from a cerebral gunshot wound, localized in the sensorimotor cortex. Early and prolonged rehabilitation was successful. In 1950, Glees (1909–1999) and Cole (Oxford) placed a small motor-cortical lesion in macaque monkeys; for a few days, the monkeys had difficulties and were slow for the task. Daily training was resumed and recovery was accelerated by alimentary reward. Finally, Lashley (1890–1958) understood that handicapped patients “achieved their goal with variable means.” This demonstrated the value of active and prolonged rehabilitation, in addition to the (passive) recovery of function. 相似文献