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ABSTRACT In this paper, we introduce a new spatially constrained clustering problem called the max‐p ‐regions problem. It involves the clustering of a set of geographic areas into the maximum number of homogeneous regions such that the value of a spatially extensive regional attribute is above a predefined threshold value. We formulate the max‐p ‐regions problem as a mixed integer programming (MIP) problem, and propose a heuristic solution.  相似文献   

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《Acta Archaeologica》2013,84(1):14-14
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A series of Gallo‐Roman clothes and miscellaneous textile fragments from the first and second centuries from the Martres‐de‐Veyre necropolis (Puy‐de‐Dôme, France) was investigated. The objects studied were excavated between 1851 and 1923, during successive rounds of archaeological work. Since that time, they have been conserved in the Barguin Museum at Clermont‐Ferrand. The target of our research was dye identification, as it gives very interesting and useful information regarding the ancient technology. This approach has until now not been considered to be relevant and, unfortunately, is not systematic. The analysis was carried out by high‐performance liquid chromatography with photodiode array detection (HPLC–PDA). The small samples (threads up to 0.6 mg, less than 1 cm long) of coloured textile fibres were submitted to this technique. In one case, X‐ray fluorescence (XRF) analysis was applied. According to the analysis, the dyeing sources proposed are the Rubiaceae family for red, a luteolin ‘base’ for yellow, ellagitannins for brown and indigo for blue colours. Several samples did not seem to contain any dye. We point out possible factors for the partial dye source determination: instrumental limits, sample size, low dyestuff content in analysed samples and the dyes’ decomposition during ageing. Some improvements of dye analysis in archaeological samples by separation techniques based on recent analytical instrumentation and combined approaches are proposed.  相似文献   

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The purpose of this article is to explore the conditions under which the postpositivist interest in rewriting or reinterpreting history could operate legitimately from a historical point of view. The first part of the article outlines and explains some of the key thematic elements of historical postpositivism. The second proceeds to investigate how these elements can be configured and related to each other within Arthur Danto's influential account of the development of contemporary art, and especially the avant‐garde. The intention is to acquire a sense of the working dynamics of postpositivist thought, so as to better understand its possible implications for the writing of history. In the concluding section an argument is proposed to the effect that, although the postpositivist interest in the rewriting of history can in principle be admitted as entirely legitimate, its legitimacy depends on introducing some substantive constraints on content, in addition to the formal considerations that postpositivist discourse generally tends to favor. It is further suggested that this constraint should take the form of a requirement on historical literacy whose meaning is, finally, elucidated by drawing a contrast with historical common sense.  相似文献   

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Melissa W. Wright 《对极》2012,44(3):564-580
Abstract: Since 2006, when Mexico's President declared war against the drug trade, the people of the northern Mexican border city, Ciudad Juárez, have been living through a record‐breaking escalation of violence, the occupation of their city by federal troops and police forces, unprecedented human and civil rights violations, and a pervasive experience of fear in public space. These events have occurred simultaneous to a devastating economic crisis. This paper asks the question, how can a feminist and Marxist geographer contribute to an analysis of what is happening in Ciudad Juárez? To address this question, I create a dialogue among activists in northern Mexico and post‐structuralist feminist and Marxist positions regarding the meaning of public fear in this city for the city's residents, for Mexico's democracy and for the making of public knowledge about the Mexico–US border.  相似文献   

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Time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) has been used, for the first time, for the characterization of opaque ancient glasses. Isotope‐specific chemical imaging with sub‐micron resolution enabled the separate analysis of opacifiying inclusions and the surrounding glass matrix. Phase identification has been demonstrated and quantification of the matrix composition has been investigated by use of Corning Glass Standard B as a model. Trace element detection limits are typically in the range 0.5–5.0 ppm atomic—in favourable cases down to 0.01 ppm. For the analysis of inclusions in particular, this has the potential to provide new information of use in establishing provenance and trade routes by ‘fingerprinting’ as well as the investigation of manufacturing techniques, as demonstrated by comparisons between glasses and with EDX data from the same samples.  相似文献   

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This paper examines the emergence of a distinctly “modern” style of history and some of its uses as applied to Buddhism by Buddhist scholars within the early Meiji period (late nineteenth century) in Japan. After a discussion of the importance of “area studies” in the formation of conceptions germane to history as practiced in Japan, the paper proposes a new category of the “non‐modern” as a means to counter the historiographical dominance of modern categories in the formation of the historical discipline, especially as formulated in Japanese studies. As a case study, the emergence of the discourse dealing with the quest for the historical Buddha is examined. By showing the methods and accomplishments of modernist historians, and the concomitant slippage of non‐modern categories in their work, this paper sketches a method of analysis particularly applicable to the intersection of religion and history.  相似文献   

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Detractors of European integration and many of its protagonists invoke state territoriality where the social and the spatial come together in a “Territorial‐Administrative Complex”. Like the military‐industrial complex claiming once to procure security, protagonists claim to guarantee democratic legitimacy. At the same time, the interests of the territorial constituencies prevail over others. The underlying notion of space is absolute and of territory that of a container. Costs and benefits are calculated in terms pertaining to it. The underlying “meta‐geography” is one of boxes‐in‐boxes, but rather than viewing space as a container, based on academic literature in the matter, planners now pursue soft planning for soft spaces. In the face of the apparently incontestable claim of the Territorial‐Administrative Complex to a monopoly on the production of democratic legitimacy, the article points out, albeit rare examples of constitutional theorists challenge this monopoly. Voting in territorial constituencies, they claim, has never been properly argued for, making it an arbitrary institution.  相似文献   

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The archaeological discovery of the Acqualadrone rostrum (an offensive naval weapon mounted on the prow at the waterline), off the Italian coast near Messina in 2008, has led to the need for scientific research in order to plan the conservation treatment of this artefact. The discovery is exceptional because of the presence of a wooden section from the original ship. This paper describes the physico‐chemical characterization of a metallic and two wooden samples by inductively coupled plasma – optical emission spectroscopy, inductively coupled plasma – mass spectrometry, Fourier transform infrared spectroscopy, 13C {1H} cross‐polarization magic angle spinning NMR spectroscopy, energy‐dispersive X‐ray spectroscopy, gas chromatography – mass spectrometry and X‐ray diffraction. The results reveal the use of leaded bronze (Cu, 70%; Pb, 20%; Sn, 10%) in the manufacturing process of the alloy and the use of lead whose isotopic composition is referable to either Spanish or Cypriot mines. The analysis of the results relating to the wooden samples indicates their different state of preservation and, at least in some places, the spreading of caulking on the wood, probably using a vegetable resin.  相似文献   

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Pompeii is an important temporal reference in the study of Roman ceramics, yet until now the origins of red slip tableware or sigillata found in the city have largely been classified by visual evaluations of the pottery. This investigation employs petrographic and elemental analyses to establish the provenance of sigillata found in two pre–ad 79 contexts of Pompeii. In contrast to previous studies, the results suggest that pottery workshops in the vicinity of Somma‐Vesuvius played a vital role in the supply of sigillata to the city.  相似文献   

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ABSTRACT This analysis examines the costs of everyday residential noise pollution using a series of “happiness regressions.” We control for both the possibility that an unobservable characteristic may cause omitted variable bias, as well as for the possibility of endogeneity bias if “effort” is not adequately taken into account. We find perceived noise pollution to exert a negative and highly significant effect on happiness. We then calculate the required income transfer to compensate for the noise and find the costs of noise pollution to be on the order of €172 per month per household.  相似文献   

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This paper shows the possibilities offered by the combined use of non‐destructive neutron and X‐ray beams in archaeological research on metallic finds. The following five artefacts from Swiss excavations were submitted to investigation, each with dedicated aims: a Roman sword, a Roman dagger, an Iron Age bucket, Iron Age spearheads and a Roman finger ring. The images obtained with both methods—neutrons and X‐rays—are discussed in length in this paper. The investigations took place at the Paul Scherrer Institute and the archaeologists who studied the objects come from the Universities of Lausanne and Zurich.  相似文献   

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J. GOLL 《Archaeometry》2005,47(2):403-423
Since Roman times, the Alpine area has been the scene of all movements in brick construction—certainly only in a few places, but always at a high technical and aesthetic level. This is all the more surprising as in the mountain areas sufficient stone material is available in a suitable quality for building. Obviously, brick materials displayed overwhelming advantages. Via the mediation of the Church and the secular managerial class, the latent capacity of brick technology was able to rapidly gain a foothold as ideas began to flow internationally. Every era has discovered particular advantages in the use of brick and has expressed them in its architecture.  相似文献   

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