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François-Xavier Le Bourdonnec Jean-Michel Bontempi Nathalie Marini Sylvain Mazet Pierre François Neuville Gérard Poupeau Jean Sicurani 《Journal of archaeological science》2010
During the Neolithic, obsidians of the Monte Arci (Sardinia) volcanic complex were by far more used in the northern Tyrrhenian area than those of the three other source-islands (Lipari, Palmarola, Pantelleria) in the western Mediterranean. It is shown that merely determinations of content for six major elements with a scanning electron microscope by energy dispersion spectrometry (SEM-EDS) are sufficient to distinguish the four types of Monte Arci obsidians. Because of the compositional similarities between these obsidian types, a multivariate analysis is recommended in provenance studies. Although SEM-EDS, electron microprobe-wavelength dispersion spectrometry (EMP-WDS) and particle induced X-ray emission (PIXE) give essentially concordant results in the determination of these six element contents, subtle technique-related biases prevent the combination of SEM-EDS, EMP-WDS and PIXE data on source samples for provenance purposes. An SEM-EDS test-study reveals the first occurrence of obsidians of Lipari for the A Fuata Middle to Late Neolithic site of NW Corsica (north of Sardinia), in addition to the usual Monte Arci obsidians. Similar to EMP-WDS, the SEM-EDS technique requires only millimeter-sized fragments. 相似文献
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Zone pricing consists in determining simultaneously several delivered prices together with the zones where these prices apply. A model and algorithm are proposed to determine optimal facility locations, prices, tariff-zones, and market areas in order to maximize the firm's profit under zone pricing. The resulting nonlinear mixed-integer program is tackled by projecting the objective function on the price space, solving repeatedly uncapacitated facility location problems for fixed values of the prices. The implicit profit function so defined is optimized by branch-and-bound. Computational results are reported. 相似文献
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Pierre Messmer 《Modern & Contemporary France》2013,21(3):383-387
This article reviews three recent books on the history of the late nineteenth-century French anarchist movement—one by the French historian Vivien Bouhey and the other two by American scholars, Alexander McKinley and John Merriman. It replaces these works in the context of a renewed interest in the study of the anarchist movement, as an early example of transnational terrorist organisation, and as a relevant field of application for the historiographic concepts of network and transnationalism. In conclusion, it highlights the differences between French and US approaches to the study of anarchism, and evidences the limits of the ‘transnational turn’ in this particular historical field. 相似文献