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The magnetic properties of obsidians are examined for their potential in sourcing obsidian artifacts. The three simplest to determine magnetic parameters—initial intensity of magnetization, saturation magnetization and low field susceptibility—are found to be effective discriminants of many Mediterranean, Central European and near Eastern sources. Although the between-source precision is not as good as geochemical analyses of minor and rare-earth elements, the technique demonstrated the existence of new sources that were subsequently confirmed by minor element analyses. Unfortunately some key sources do not appear to be readily distinguishable on these three simple magnetic parameters alone, although more sophisticated magnetic analyses may prove diagnostic. Despite this, it would appear that effective discrimination can be made in many cases, occasionally with more precision than minor element analyses. This technique therefore offers, as a minimum, a preliminary sourcing tool for use in many areas of the world, thus reducing the number of expensive geochemical analyses. Furthermore, its very low cost, non-destructive nature and speed open the possibility of quantitative evaluation of trade routes based on obsidian distributions, particularly as versions of the equipment are now suitable for use in the field. 相似文献
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Kay Barbara Warren 《Reviews in Anthropology》2013,42(2):47-51
Barbara Tedlock. Time and the Highland Maya. Albuquerque: University of New Mexico Press; 1982. 304pp. $27.50. 相似文献
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Esmaeel Rahmanishamsi Siavash Soroushian E. “Manos” Maragakis 《Journal of Earthquake Engineering》2013,17(6):931-953
A series of component-level experiments have been conducted aiming to evaluate the force and displacement capacities of typical stud-track screw connections (STCs) in steel-framed partition walls. The variables considered in these experiments included screw-edge distances, loading protocols (monotonic or cyclic), and stud and track thicknesses. The experimental data was then utilized to develop different capacity fragility curves for STCs in terms of displacements. A series of analytical STC hinge models were also proposed and validated using this data. The hinge models can be adopted in future studies to develop a comprehensive analytical model for a typical partition wall assembly. 相似文献
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C.Warren Hollister 《Journal of Medieval History》1975,1(1):19-41
On 1 January 1127 Henry 1 made his magnates and prelates swear to accept his daughter Maud as heiress to England and Normandy. In the months prior to the oathtaking, certain identifiable curiales ~ Robert earl of Gloucester, Brian fitz Count, and David king of Scots - seem to have been supporting Maud's candidacy. Others, including Roger bishop of Salisbury and his kinsmen, appear to have opposed her and perhaps to have supported Henry's nephew, William Clito, as heir.The factions resurfaced at Henry's death in December 1135. William Clito having died in the meantime, Roger of Salisbury became one of Stephen of Blois' earliest and strongest supporters. Maud's former friends, Robert of Gloucester and Brian fitz Count, were temporarily immobilized by a violent break between Henry and Maud in the closing months of Henry's reign, but they, along with King David, subsequently became Maud's most active and consistent champions.The two factions differed neither in socioeconomic background nor in ideology. It was not a question of old baronial families on one side and newly-risen curiales on the other, but simply of differing personal allegiances originating in the divisions among Henry's courtiers in 1126. 相似文献