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Filipe Castro 《International Journal of Nautical Archaeology》2007,36(1):148-154
Methods of designing the bottom of ship's hulls were only a small part of the process of building a frame-based ship in Portugal in the 16th and early 17th centuries, but they deserve a careful look. Using a number of geometric algorithms that were already well-known to Italian shipwrights of the 15th century, Portuguese shipwrights obtained the co-ordinates of the turn of the bilge points of the central, pre-designed, frames without the need for making drawings.
© 2006 The Author 相似文献
© 2006 The Author 相似文献
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Palaeohistology as a valuable diagnostic instrument is dependent on the production of high‐quality thin‐ground sections from dry bone. The objective of this study was to consider technical differences and assess the qualitative outcomes of five techniques for preparing thin‐ground sections from dry archaeological bone. Established techniques with long follow‐up times and excellently documented results were compared with simpler and cheaper time‐saving techniques. Evaluations were made of the quality of thin sections obtained by one classical machine‐based embedding technique, two revised versions of the same technique, one manual moulding technique based on Frost's rapid technique and one manual hybrid technique. Five osteological specimens of differing quality were prepared following the manuals for these five techniques and examined microscopically with respect to a list of standardised histological and diagenetic parameters. Alterations in the specimens attributable to preparation effects were recorded, and observations were scored with reference to three criteria: section quality, technical quality and staining. The results show that embedding techniques are to prefer. Superglue should not be used as a mounting or embedding medium. Manual grinding comes with several limitations, and machine cutting and grinding are preferred. Haematoxylin staining can be successfully applied to embedded specimens, giving more information on microscopic diagenetic processes. A stepwise manual for a revision of the classical embedding technique is presented. The time required for producing sections using classical embedding techniques is shortened from 6 weeks to 3.7 days by refining the preparation/polymerization processes involved with no loss of osteological data. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Moulds,Graminhos and Ribbands: a pilot study of the construction of saveiros in Valença and the Baía de Todos os Santos area,Brazil
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The survival of late medieval Mediterranean techniques to conceive and build ships and boats in Brazil was noted by John Patrick Sarsfield in the 1980s, but his study of the Valença shipwrights was interrupted by his untimely death in 1990. This paper summarizes Sarsfield's account of these shipbuilding techniques, examines that published by Lev Smarcevski (1996), and provides some preliminary results of the pilot stage of a project to further research traditional shipbuilding in Valença and the Baía de Todos os Santos region. 相似文献
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江苏日伪县知事县长群体分析 总被引:1,自引:0,他引:1
沦陷时期江苏苏中、苏南地区的伪县知事、县长在清乡(1942年)前后有较大的变化。清乡前大多由地方上的耆老、商会会长等头面人物担任,清乡后则主要是由日伪政权机关任命的较为年轻者组成,且相当一部分人出身行伍。清乡前日伪中央政权及省政府并不能有效控制县级政权,之后其控制范围也仅囿于苏南各县;而日本占领者对县级政权的人员任免和控制程度正好与伪中央政权相反。 相似文献
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本文就《楚辞》名篇《国殇》中的名句“首身离兮心不惩”阐述了“身首分离”的内容和这一恒语产生的基础以及它在《国殇》中的意义。 相似文献