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European mixed-alkali glasses are compared with Sayre and Smith's categorisation for ancient glass and with the chemical compositions of other prehistoric and later European glasses. The new categories reported here indicate that a wide range of alkali raw materials was used in the production of glasses found in prehistoric European contexts. At least five major chemical categories of glass are now known to have been used in prehistoric and early Roman Europe. A plant species of the genus Sulicorniu is suggested as a possible alkali source in ancient European glasses.  相似文献   

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Organic residue analysis has been performed on 62 reconstructed vessels from a single archaeological site (Rounds, Northamptonshire, U.K.). In order to establish regions of lipid accumulation within a vessel, sherds were sampled from different parts of a vessel, for example base, body and rim, and submitted to lipid extraction procedures. The techniques of high-temperature gas chromatography (GC) and GC/mass spectrometry (GC/MS) were then used to analyse the sherd lipid extracts. The quantitative results obtained show differential accumulation and preservation of lipid in various parts of the same vessel. This latter observation has serious implications for the sampling of potsherds for organic residue analysis. Furthermore, the amount of absorbed lipid varies quite considerably between vessel types. On this basis, a new method is proposed for classifying vessel use by comparing the concentration of lipid present in different parts of individual vessels.  相似文献   

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The use of surveys by cities for planning or evaluation requires attention to several problems identified by users. An assessment of the impact of these issues was made using three surveys by the city of Dallas. It was determined that surveys may be particularly valuable in evaluating service delivery patterns for services which offer delivery agents a high level of discretion. For these services, non-whites reported higher levels of dissatisfaction than whites, a pattern not evident when low discretion services are evaluated. The study also allowed development of specific suggestions regarding the structure of survey questions and the evaluation of services by non-users.  相似文献   

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A multi‐method approach, based on petrography, stable isotope data and electron spin resonance spectroscopy for assigning the provenance of white marbles, is presented. A total of 11 experimental variables has been used, including the quantitative measurement of the sample colour and its homogeneity. On this basis we attempt to distinguish the three main quarrying basins of the Carrara district, that is, Torano, Miseglia and Colonnata. Such discrimination, extremely uncertain on the basis of the single techniques, may be performed with acceptable confidence’ using a properly selected subset of six petrographic, isotopic and spectroscopic variables. The final resubstitution and jackknifed re‐assignment rates are, respectively, 85% and 81%. Inclusion of the remaining five variables into the classification rule does not improve the results, but simply increases data overinterpretation. The practical possibility of using such an approach for more general provenancing problems is considered.  相似文献   

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A focus on roots, localizations, usurpations, and obliterations together with commemoration and different fields of scholarly research, along with a thematic focus on Homer's Nykia, permit Hans Ruin to revisit the foundations of history in Being with the Dead. Ruin draws on cultural sociology, including the work of Alfred Schütz, as well as Heideggerian historicity and the dead of the distant past, including archaeology and ethnography, paleography and physical anthropology. Ruin also engages Michel de Certeau's Writing of History and its focus on the other in a necropolitical account tracked through interdisciplinary fields. In my reading I supplement Ruin's critical focus on Homer scholarship beyond the twentieth century with a return to Nietzsche's nineteenth-century emphasis on the “blood” needed to bring the voices of the past to speak in his own reading of Homer. To do this, I note the dead-silenced (“zombie”) scholarship haunting Nietzsche's voice in his field of classical philology in addition to Nietzsche's source scholarship and his hermeneutic methodology of historiographical research for the sake of ethnography, archaeology, and Nietzsche's lectures on pre-Platonic philosophy.  相似文献   

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中国钱币学会第五次会员代表大会是一次承上启下,继往开来的会议,以往四届理事会期间,做了大量工作,取得了很好的成绩,作为新的一届理事会,责无旁贷,要更加努力,做好钱币学会的工作,把我国的钱  相似文献   

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Integrated land-use—transportation models are characterized as models in which the redistributive effects of one subsystem upon the other are explicitly defined and incorporated into the model's structure. At the core of integrated models is a linking procedure whose function is to transform the outputs of one model component into inputs for the other. Despite major efforts made in the past to build operational large scale integrated models, the structural properties of such models remain largely unexplored. This paper describes a general framework for an integrated model consisting of prototype model components. These are an iterative activity allocation model of the Garin-Lowry type, an equilibrium-assignment transportation network model, and a linking procedure. Given the level of analysis, this framework is shown useful for exploring the analytics of integrated models and, in particular, their equilibrium properties. By means of many simulation experiments based on an hypothetical numerical example, the operation of the model is demonstrated with an emphasis on the locational interpretation of the integration procedure. On the basis of the empirical results and considering the model's intrinsic assumptions, the following major findings can be cited. First, the effects of nontravel factors (such as basic employment and zonal attractions) upon activity distribution are stronger than effects caused by changes in the transportation system. The latter effects were found to yield nonlinear and, spatially, nonuniform changes in activity location which also tended to be larger in peripheral regions. Second, implicit in the specification of the integration procedure are behavioral assumptions regarding time-lags in locational adjustments made by activities in reaction to rising cost of travel. The present formulation implies that once located, activities do not revise their locational decisions despite substantial increases in travel costs. At the other extreme, all activities are permitted to readjust their locational preferences after the final interzonal travel costs are derived. The effect upon activity distribution of the latter specification is, of course, larger than that of the former, although less than the effect yielded by changes in nontravel factors. Regarding the equilibrium properties of the integrated system, both the theoretical and empirical analyses show that the entire model will converge into an equilibrium solution and that the corresponding trip patterns are also at equilibrium. These results will hold as long as the operation of the integrated models is completely controlled by the generation functions of the land-use model and the transportation model component only affects the spatial distribution of activities. Finally, the results from the simulation experiments indicate that the computed mean travel cost parameter tends to stabilize around a certain value as the level of demand for travel, within the system, rises. There is evidence that compensating changes in the location and composition of this demand are the main causes of this phenomenon. In light of these findings, it is possible to point to three key problems whose resolution could largely improve the predictive power of integrated models. First, it would be useful to define activity models in which the generation of activities is, among other things, a function of travel conditions. Second, currently formulated integrated models do not contain trip demand functions and, thus, demand for travel by an activity unit is regarded as completely inelastic. Third, different locating activities respond differently—over time and space—to changíng travel conditions, and models should, therefore, reflect explicitly such differences in activity behavior. A recent paper by Los [14], is an important contribution to the analysis of this issue.  相似文献   

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SummerinShannanfea-tUresemeraldmountains,Icrystalclearwater,greentrCesandaDleasantlivinRenvironment.Inducedbyallofthis,Irecentlypaidavisittotheprefecture.onceIwasthere,IfoundIwasveryattractedbytheSamyeMonasterytheNo.lancientmonastCryinTibet.COLLECTlONOFTHREETREA-SURES.TheSamyeMonasteryislocated38kInawayfromZetangTown(thesiteoftheShannanAdmin-istrativePrefecture),inChanangCounty.ItliesatthesouthernfootoftheHaburiMountainonthenorthernbankoftheYarungZangboRiver.Thelocationis…  相似文献   

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