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Abstract

Ceramic effigies of marine shell cups have long been known from Mississippian sites in Illinois and elsewhere in the Southeast, and have been included in studies of other ceramic effigies, such as animal figures and head pots (Holmes 1886). This paper focuses on 31 known Illinois specimens. I will show that, in Illinois, the geographic range of these effigies is primarily restricted to the American Bottom around Cahokia, and their occurrence is largely limited to Late Mississippian Moorehead and Sand Prairie phases (A.D. 1200 to 1400). I also explore possible meanings of shell cups and, by extension, ceramic effigies of shell cups. Ethnohistoric as well as archaeological evidence show that lightning whelk cups and, by analogy, shell cup effigies functioned in contexts of uncertainty and conflict, consistent with their context in Illinois.  相似文献   

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西方集群和集群政策的研究及其对中国的借鉴意义   总被引:2,自引:0,他引:2  
自上个世纪90年代末以来,国内学者和政策决策者对集群的集群政策表现出日益浓厚的兴趣。由于现行的集群理论源自西方工业化国家,作为发展中的中国能否和如何吸收运用这些西方理论和研究经验成为讨论的焦点之一。本文的目的是通过探讨西方集群研究和集群政策的理论基础,以期能带给中国的相关研究一些有益的启示。本文首先对波特和经合组织两学派的集群概念的起源、发展和着重点进行了回顾。然后分析了集群起源和发展的条件、生命周期、发展机制、空间维度、类型等西方集群研究的要素,阐述了西方工业国家的集群政策概念及相关评判。相对于发达国家丰富的关于技术创新区域的研究而言,针对发展中国家创新系统和集群的理论性及经验性研究则要少得多。所以发展中国家的集群研究及集群政策需要更合适自身实际情况的理论。最后笔者以集群理论和中国实际情况为例,通过问题的分析、理论的分析和理论的调整三步骤说明新理论发展的可能途径。  相似文献   

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The increasing importance of the Soviet Arctic for navigation in connection with a northward shift of resource development and the strengthening of the Soviet icebreaker fleet with nuclear-powered icebreakers and modern conventional icebreakers has focused attention on the issue of freedom of navigation in the Soviet sector of the Arctic. The Soviet sector, defined in a 1926 decree as extending from the mainland to the North Pole, comprises the Northern Sea Route, which the Soviet Union regards as an internal shipping route, and seas of the Arctic Ocean that it views as historic waters. Because of differences in the interpretation of international law, there is ambiguity regarding the right of innocent passage through the Soviet Arctic by vessels of other nations. The growing significance of Arctic shipping operations raises the timeliness of the issue.  相似文献   

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Summary. Fragments of ceramic sieves constitute a widespread, but littleknown element in the ceramic inventories of Linear Pottery sites in temperate Europe. These sieves appear to have functioned as strainers for separating curds from whey in cheese production, on the basis of parallels with later archaeological cultures and ethnographic examples. Archaeozoological data support the hypothesis that dairy production has a greater antiquity than has been hitherto accepted. The sieves played an important role in early dairy production, for the manufacture of cheese was an essential step in the exploitation of milk by populations who possibly had a high level of lactose intolerance.  相似文献   

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An obsidian source can exhibit considerable variations in chemical composition. One such flow at Borax Lake in Lake County, California has been carefully investigated by neutron activation analysis of specimens from a number of different loci. It was found that the variable elements were completely coherent, and thus judgements concerning provenience could be just as definitive as with extremely homogeneous materials.  相似文献   

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The psychiatric impact of involuntary job loss is evaluated in this paper in light of the attitude among some policy makers that contemporary unemployment is associated with minimal personal costs. Research bearing directly and indirectly on the mental health consequences of job loss is reviewed. Preliminary findings from an ongoing study of family and personal impacts of job loss in which this writer is engaged are also presented. The collective evidence of at least selective psychiatric effects of unemployment is then examined for its implications for human service policy especially in relation to the primary, secondary and tertiary prevention of mental illness.  相似文献   

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ABSTRACT We develop a regional model where, in the city, unemployment prevails because of too high (efficiency) wages, while, in the rural area, workers are paid at their marginal productivity. We characterize the steady‐state equilibrium and show that it is unique. We then consider two policies: decreasing urban unemployment benefits and subsidizing urban employment. We find that decreasing the unemployment benefit in the city creates urban jobs and reduces rural–urban migration since new migrants have to spend some time unemployed before they can find a job in the city. On the other hand, raising employment subsidies increases urban employment but may also increase urban unemployment because it triggers more rural–urban migration. In this respect, the employment subsidy policy can backfire by raising rather than reducing urban unemployment.  相似文献   

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会展经济是市场经济的产物,大力发展会展经济,对推动社会经济起着巨大的作用.会展与现代经济的密切关联决定了会展人才的培养要适应会展市场对人才的需求.因此,培养会展市场需要的高素质人才是高等院校教育工作者亟待解决的问题.课程结构体系是实现人才培养目标、提高人才培养质量的核心所在.而国内高等院校会展课程设置缺乏体系,造成泛而杂、全而乱等问题,影响了人才培养目标的实现.本文对美国乔治·华盛顿大学会展管理专业和英国利兹城市大学会展专业的课程体系进行了细致的分析,旨在为新办会展经济与管理专业院校的课程体系及人才培养提供可借鉴的发展思路.  相似文献   

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Recognizing the contingent entanglement between historiography's social and political roles and the conception of the discipline as purely factual, this essay provides a detailed analysis of “revision” and its connection to “revisionism.” This analysis uses a philosophical approach that begins with the commonplaces of our understanding as expressed in dictionaries, which are compared and contrasted to display relevant confusions. The essay then turns to examining the questions posed by History and Theory's Call for Papers announcing its Theme Issue on Revision in History, and, where philosophically relevant, answers them. The issue of paradigm change proved to be quite significant and required particular attention. A “paradigm” is analyzed in terms of Quine's “web of belief,” and that web is itself explained as an ongoing process of revision, in analogy with Rawls's concept of pure procedural justice. Adopting this approach helps clarify the entanglement between politics and historiographical revision.  相似文献   

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Canonical correlation has seen growing acceptance in geographical research as a tool for analysing the interrelationships between two sets of variables.1 It provides a natural extension to the multivariate case of simple correlation analysis introduced into the discipline in the fifties for measuring the degree of areal association between two individual variables.2 It has also proved valuable for forging a link between traditional geographic variables measuring the attributes of places and those indicating interactions among them.3 Recently, major developments in canonical theory have occurred which provide two major benefits for geographical research.4 First, asymmetrical regression relationships in addition to symmetrical correlation relationships between two variable sets can be determined. Researchers can use canonical regression to examine the degree to which one variable set is capable of predicting the other, in addition to canonical correlation which examines the symmetrical interrelationships between the two.5 Secondly, much improved methods are available for measuring the number, strength, and nature of the interrelationships between the two variable sets, and for assessing the adequacy of the canonical model in general.8 The purpose of this paper is to provide an overview of these developments and, more particularly, to explore their implications for the validity of empirical results obtained in earlier applications of canonical analysis. This is not intended as a criticism of these studies but rather as an attempt to further our understanding of spatial structure and process through re-examination of existing data in the light of refined techniques.  相似文献   

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Analysis has been conducted on 19 blue glasses from Amarna in Middle Egypt dated to around 1350 BC. The results suggest that these glasses fall into two distinct types: cobalt coloured glasses with a natron based alkali made from local Egyptian materials, and copper coloured glasses with a plant ash alkali, which follow a Mesopotamian tradition of glass making. It is suggested that at least some of this copper/plant ash glass is imported into Egypt during the Amarna period despite extensive local production of cobalt/natron glass. Existing analyses (Lilyquist and Brill 1995) of the earliest glass from the reign of Tuthmosis III (c. 1450 BC) suggest that during this period the same two types of glass are present. Local Egyptian cobalt and natron in these early glasses implies that, despite the lack of archaeological evidence for production sites, glass was produced from its raw materials in Egypt as early as the reign of Tuthmosis III.  相似文献   

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This paper argues for cross-validation to reduce bias in estimating Mahalanobis distances of individuals to groups, a particular problem with small sample sizes. Formulae for the efficient computation of cross-validated distances, which avoid excessive matrix inversion, are given. The use of Mahalanobis distances as measures of consistency, or as indications of outlying values, is described. The little-known technique of gamma plotting is outlined and discussed as an aid to interpreting distances in these terms. Both cross-validation and gamma plotting are illustrated in an example on marble composition.  相似文献   

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ABSTRACT This paper surveys recent evidence on the determinants of (national and/or foreign) industrial location. We find that the basic analytical framework has remained essentially unaltered since the early contributions of the early 1980s while, in contrast, there have been advances in the quality of the data (more firm and plant level information, geographical disaggregation, panel structure, etc.) and, to a lesser extent, the econometric modeling. We also identify certain determinants (neoclassical and institutional factors) that tend to provide largely consistent results across the reviewed studies. In light of this evidence, we finally suggest future lines of research.  相似文献   

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ABSTRACT We investigate how cross‐country differences in firms' fixed set‐up costs affect the trade‐off between global efficiency and spatial equity. Our analysis reveals that the standard assumption of symmetry in set‐up costs masks the existence of an interesting effect: the range of available varieties depends on the spatial distribution of firms. In such a setting, where the market outcome leads to excessive agglomeration in the symmetric case, a planner may opt for asymmetric set‐up costs and even more agglomeration. We show that the planner will always favor lower set‐up costs in the large country with more agglomeration when the consumer's marginal preference for variety is high, or with less agglomeration when the consumer's marginal preference for variety is low.  相似文献   

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