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In technological approaches to prehistoric industries, there is currently a renewed interest in the transformation of osseous materials. This approach requires the construction of a technical reference base of manufacturing stigmata, as well as of the procedures and methods used to produce tool blanks.One of the better known processes for the production of blanks in the Upper Palaeolithic is extraction by a double longitudinal groove, observed only in the Gravettian. Aurignacian artefacts indicate that during this period blanks were obtained through a procedure of longitudinal fracturing (splitting) or diffuse percussion fracturing. The manner of implementing these procedures is, however, still poorly known.In order to better characterise this stage in the manufacturing of blanks for antler points, we conducted an experimental study. Based on a thorough analysis of the Spanish archaeological materials, we tested the procedure of fracturing by indirect percussion on deer antler. The results provide new criteria for the identification of blanks and their manufacturing processes. They also emphasize the possibility of predetermining the size of the blank and, consequently, the size of future projectile point.  相似文献   
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The late medieval illustrated Jerusalem travelogue by the Franciscan friar Paul Walther von Guglingen has heretofore received scant scholarly attention, perhaps owing to the unusual nature of some of its images. Guglingen charts decidedly Islamic spaces with his maps and plan, instead of the conventional sacred shrines of Christianity; these topographical features are interlaced with personal travelling experiences. Illustrations of flora and fauna encountered along the way are the result of careful observation, and meticulous recording. The author experiments with forms to visually represent his own lived experience. In all cases, text and image are closely intertwined and testify that non-religious aspects form a legitimate aspect of this pilgrimage account. Consideration of the illustrations in Guglingen’s Itinerarium, alongside, for example, those in the travelogue of his famous travel companion Bernhard von Breydenbach, allows us to illuminate more facets of the late medieval pilgrimage experience.  相似文献   
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Abstract: By unravelling the adoption and adaptation of the North American Business Improvement District (BID) model in South African cities, this paper considers the way neoliberal principles are making their way in the post‐apartheid context. Drawing on a comparative approach of BIDs in Johannesburg and Cape Town, we analyse the tensions and conflicts surrounding their implementation and unpack the resilience of this model. As unexpected as this resilience might be in such a context, that is, far away from the heartland of neoliberalism, we argue that this resilience is linked to the permeability of the local contexts and to the plasticity of the model itself at the city and neighbourhood levels, reflecting a capacity to adapt to inherited regulatory frameworks, patterns of territorial development and embedded socio‐political alliances of the local terrains, as well as an ability to accommodate post‐apartheid issues through the crafting of what we refer to as “local Third Ways”.  相似文献   
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This article contains an account of the career of John Eccles that can be divided into two parts. The first extends from 1925, when he won a Rhodes scholarship to Magdalen College Oxford, to 1975, when he took voluntary retirement from the State University of New York at Buffalo. During this period, he set up six different laboratories in which he carried out research on synaptic mechanisms that provide the basis of neuroscience. The second period is the 20 years between his retirement and death in Switzerland, which he spent on the problem of the relationship between mind and brain.  相似文献   
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Since 1870 a group of planners tried to ground urban planning scientifically in economy, engineering and hygiene. It is argued that hygiene as a newly developed natural science provided planners with a lot of good arguments to legitimize a change in the traditional urban planning regulations. These had not been able to prevent the chaotic growth of big cities that resulted in a housing misery, in large block of flats, and in noisy and smelling factories neighboring better class housing. Hygienic reasoning concerned with sunlight (because of its germ killing capacity), air, and ventilation (to drive away miasma) was transformed into urban planning and, than, stood for lesser hight of buildings, more space between large blocks of flats, and different parts of town for industry and housing. Planning regulations with these ends were often opposed by owners who did not accept the devaluation of their property. Therefore it was not before 1918 that these hygienically motivated planning regulations could be set into practice by a new ruling class.  相似文献   
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We offer a general-equilibrium economic approach to Zipf's Law or, more generally, the rank-size distribution—the striking empirical regularity concerning the size distribution of cities. We provide some further understanding of Zipf's Law by incorporating negative feedbacks (congestion) in a popular model of economic geography and international trade. This model allows the powers of agglomeration and spreading to be in long-run equilibrium, which enhances our understanding of the existence of a rank-size distribution of cities.  相似文献   
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Pope Damasus (366–384) was the impresario of the late antique cult of the martyrs at Rome. Damasus celebrated the martyrs with epigrams written in Virgilian hexameters which he had engraved in exquisite lettering on their tombs. This article investigates the specifically Roman context of these activities as a means of shedding new light on Damasus' purposes. The enhancement of the cult of the Roman martyrs was more than a stage in the process of christianisation, creating Christian but still distinctively Roman holy patrons for the urbs. It was also directed against rival Christian traditions, including Nicene splinter groups such as the Ursinians and Luciferians who contested Damasus' election. The epi grams allowed Damasus to inscribe very specific and carefully shaped meanings on strategic and often contested sites within the Christian topography of Rome. By placing the Damasan epigrams in the context of a bloody ecclesiastical factionalism in Rome, this paper argues that these very public celebrations of the martyrs were used to promote concord and consensus within the Catholic community in Rome.  相似文献   
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