MECHANICAL PROPERTIES OF STONE ARTEFACT MATERIALS AND THE EFFECT OF HEAT TREATMENT*

Mechanical testing of lithologies used for stone tool manufacture has shown that fracture toughness is the most objective measure of the quality of raw materials shaped by either flaking or pecking/grinding. Materials amenable to pressure flaking and blade manufacture have low values of fracture toughness, whereas those shaped by pecking/grinding have high values. The fracture toughness test is also the most definitive for quantifying the improvement in flaking properties of materials subjected to intentional heat treatment. Cryptocrystalline and macrocrystalline siliceous lithologies demonstrate a well-defined, gradual reduction in fracture toughness with increased temperature. When heated to optimum temperatures, their fracture toughness approaches that of obsidian, the lithology generally regarded as having the best flaking properties.     

A NOVEL APPROACH TO STUDIES OF PREHISTORIC EXPLOITATION OF STONE TOOL MATERIALS USING MATERIAL COMPOSITION,SURFACE MORPHOLOGY,MICROSTRUCTURE AND MECHANICAL PROPERTIES*

For a comprehensive understanding of material exploitation in prehistory, we applied advanced analytical methods to Japanese prehistoric stone tool materials. Compositions, surface morphologies, microstructures and mechanical properties of the primary lithic materials were analysed. As a result of the tests on actual Palaeolithic artefacts, preferential material selection was observed based on composition, structure and other physical properties of the materials. Homogeneous materials composed of a single type of mineral—α‐quartz—were intentionally selected for Palaeolithic tools regardless of the type of rock. These materials unexceptionally present higher hardness and strength. Moreover, materials composed of extremely fine crystal grains of ~0.1 µm in size with highest hardness and strength were selectively used for sharp‐edged blades. These results lead us to the conclusion that quantitative and objective analyses will give us precise information on prehistoric materials, which will enable us to make an analytical approach to the comprehension of prehistoric exploitation of stone materials. This could eventually complement the traditional interpretation of material exploitation based on conventional petrological classifications.     

AN INVESTIGATION INTO THE RELATIONSHIP BETWEEN THE RAW MATERIALS USED IN THE PRODUCTION OF CHINESE PORCELAIN AND STONEWARE BODIES AND THE RESULTING MICROSTRUCTURES*

The microstructures of porcelain and stoneware bodies from north and south China, spanning the period from the Tang to the Ming dynasty (7th–17th centuries ad ), were examined in polished sections in a scanning electron microscope (SEM) after etching the sections with hydrofluoric acid (HF). Mullite, present as fine, mainly elongated crystals, is the dominant crystalline phase observed. The bulk chemical compositions of the bodies are determined by energy‐dispersive spectrometry in the SEM, and the relative amounts of mullite and quartz present in the different ceramics are estimated from X‐ray diffraction measurements. Mullite formed from areas of kaolinitic clay, mica particles and feldspar particles is distinguished through a combination of the arrangement of the mullite crystals, and the associated SiO₂/Al₂O₃ wt% concentration ratios. It is shown that very different microstructures are observed in ceramic bodies produced using kaolinitic clay from north China (Ding porcelain and Jun stoneware), porcelain stone from south China (qingbai and underglaze blue porcelain and Longquan stoneware), and stoneware clays from south China (Yue and Guan stonewares). Therefore, SEM examination of HF‐etched, polished sections of the bodies of high‐refractory ceramics has considerable potential for investigating the raw materials used in their production.     

MECHANICAL PERFORMANCE OF QUARTZ-TEMPERED CERAMICS: PART I,STRENGTH AND TOUGHNESS*

The effect of quartz temper on the physical and mechanical properties of clay ceramics and the elucidation of the underlying mechanisms that are responsible for these effects are presented here. Characteristics studied included bulk density, open and closed porosity, density of impervious portion and fracture morphology. Mechanical behaviour was studied by measuring energy dissipation during fracture, Young's modulus, initial fracture toughness and strength in flexure. The significant increase in toughness with quartz volume fraction is explained by the development of a model that accounts for the crack distribution around the grains. The archaeological implications of the work are discussed on the basis of all the parameters that might affect the potter's choices of raw materials.     

THE RELATIONSHIP BETWEEN METALWORK, COPPER SOURCES AND THE EVIDENCE FOR SETTLEMENT IN THE GREEK LATE NEOLITHIC AND EARLY BRONZE AGE

Summary. This paper discusses the evidence for copper- and bronze-working in later Neolithic and Early Bronze Age Greece and seeks to define the relationship between these industries and the copper ore sources which were potentially available. It compares the distribution of metalwork with that of contemporary settlement, and lists the occurrence of copper sources in each region. A contrast is also drawn between the later Neolithic industries, which resemble those of the Balkans, and those of EB II and III, which have essentially a Near Eastern Background. Although the same ore sources may have been used in both periods, the scope and organisation of the industries was markedly different. It is concluded that even though there were enough local and widespread copper sources to meet demand, there is no evidence that any one copper source was systematically exploited in EBA. The extent to which the Laurion copper source influenced the organisation of copper acquisition in MBA is discussed.     

MECHANICAL PERFORMANCE OF QUARTZ-TEMPERED CERAMICS: PART II,HERTZIAN STRENGTH,WEAR RESISTANCE AND APPLICATIONS TO ANCIENT CERAMICS*

Mechanical performance of ceramics can be measured by various techniques. Conventional testing usually requires multiple samples of large size and specific geometries and for this reason cannot be usually applied directly to ancient pottery. However, Hertzian strength and wear resistance can be measured on the same specimen, of small size, and it is shown that these tests can describe, to a good approximation, the basic ceramic mechanical propertics (strength and toughness). Therefore, these tests are proposed for use on archaeological specimens. An application on Punic amphorae found in Corinth is presented.     

RELATIONSHIP BETWEEN THE COLORATION AND THE FIRING TECHNOLOGY USED TO PRODUCE SUSA GLAZED CERAMICS OF THE END OF THE NEOLITHIC PERIOD*

Ancient decorated potteries from Susa (Mesopotamia) dating from 4200 to 3700 bc , were studied in order to determine the origin and the nature of the raw materials used, and to identify the technological processes applied to make the ceramic bodies and their decorations. Bulk compositions were determined by particle induced X‐ray emission (PIXE), while the microstructure and the mineralogical phases were studied using scanning electron microscopy (SEM), energy dispersive X‐ray analyses (EDX) and X‐ray powder diffraction (XRD). The results showed that the raw materials used to elaborate these potteries were similar for all the ceramic bodies (carbonates and iron and magnesium‐rich clays containing sand), and for all the decorations (iron oxides, silica, potassic and alumina sources). The variations of coloration of the ceramics and of their decorations were due to different firing temperatures. The ranges of firing temperatures used by potters were evaluated on the basis of mineral stability domains.     

TIME,NARRATIVE, AND FICTION: THE UNEASY RELATIONSHIP BETWEEN RICOEUR AND A HETEROGENEOUS TEMPORALITY

In Time and Narrative, Paul Ricoeur confirms the relationship between time experience and how it is epitomized in a narrative by investigating historiography and fiction. Regarding fiction, he explores temporality in three “novels of time” [Zeitromane]: Mrs. Dalloway by Virginia Woolf, The Magic Mountain by Thomas Mann, and À la recherche du temps perdu by Marcel Proust. Ricoeur perceives the temporalities as homogeneous; however, in my view, the novels contain at least three different temporalities. Mann seeks a new temporality by ironizing a romantic time of rise and fall and Woolf configures a time we can call the simultaneity of the dissimultaneous. In his analysis of Proust's À la recherche du temps perdu, Ricoeur explicitly dismisses a Bergsonian approach to temporality. In my opinion, Bergson defends a heterogeneous time that is apparent in Proust's novel.     

ROCK PHYSICS AND THE NEOLITHIC AXE TRADE IN GREAT BRITAIN*

This paper is concerned with the products of a number of Neolithic quarries in highland Britain. It investigates the claim that the scale of axe distribution was partly the result of social factors which resulted in these artefacts gaining an added value in areas remote from their sources. One case study considers the sequence of production in Cumbria, in relation to the tensile strength of the rock quarried in different parts of the region. It shows that these considerations had only a limited influence over the choice of stone source and the scale on which it was worked. A second study compares the tensile strength of the main raw materials used for making non-flint axes with the extent to which these sources were actually exploited. Again there is only a limited relationship between the two, suggesting that social factors may indeed have been important.     

中国古代人与自然环境关系思想透视

在人类正面临生存环境的严重挑战的今天,中国古代人地关系思想的科学价值与现实意义受到中西方学者的高度重视。中国古代人与自然环境关系思想的突出特色在于,承认自然环境限制作用,强调在此前提下主动地适应自然环境,从以人为本的基点出发去保护自然环境、追求人与自然环境的和谐。这种人与自然环境相协调的人地观是中华民族在长期与开发利用自然环境的生产和生活实践过程中形成的,是中华民族悠久的文化传统的重要组成部分,也是中华文明得以延续的一个重要因素,它对现今社会的发展仍具有现实意义。     

THE JUDICIOUS SELECTION AND PRESERVATION OF TUFF AND TRAVERTINE BUILDING STONE IN ANCIENT ROME*

The Republican and early Imperial monuments of Rome are, for the most part, built of tuffs quarried from at least seven pyroclastic deposits erupted from nearby Monti Sabatini and Alban Hills volcanoes. Remarks by Vitruvius (2.7.1–5), field observations of the monuments, and petrographic and rock testing studies of samples from Roman quarries demonstrate that Roman builders developed a good knowledge of the diverse material properties of the tuffs over centuries of use and exposure. Measurements of compressive strength, specific gravity, water absorption and adsorption of water vapour confirm that the petrographic characteristics of each tuff lithology strongly influence its strength and durability. Early construction utilized weakly durable, soft or vitric tuffs such as Tufo del Palatino or Tufo Giallo della Via Tiberina that are susceptible to decay, as at Temple C (290 bc ) of the Largo Argentina Sacred Area. Late Republican structures, such as the Temple of Portunus (80–90 bc ), employed somewhat durable, vitric–lithic Tufo Lionato reinforced with travertine, a durable limestone quarried near Tivoli. Roman builders selected the material properties of the tuffs to advantage for specific structural elements within large public monuments of the first century bc and the first century ad , as at the tabernae of the Forum of Caesar (46 bc ), where an upper storey of lightweight Tufo Lionato is supported by robust, lithic–crystal Lapis Gabinus pillars and flat arches reinforced with travertine. The tuffs are not very durable building stones; Romans preserved them with protective stucco, and travertine and marble cladding. Their high water intake, coupled with direct exposure to rain, daily fluctuations in relative humidity and urban weathering at present makes them especially vulnerable to decay.     

试论人-地关系研究中的对称性问题

针对地理学在人地关系理论研究上日益被其他学科挤向边缘的现实危险,本文剖析后认为,根本的症结在于地理学对这一问题始终缺乏一个最能切合地理学学理特征的基本抽象范式。本文将人-地关系对置双方置于地理系统等级序列的框架内,从"分形论"、"界壳论"和"耗散结构论"的理论高度进行深入的讨论和审视,从而得出人-地关系的对称抽象原理。     

THE NUMBER‐AVERAGE SIZE RULE: A NEW EMPIRICAL RELATIONSHIP BETWEEN INDUSTRIAL LOCATION AND CITY SIZE*

ABSTRACT The spatial intensities of both industries and population are highly uneven across space. Moreover, these intensities differ not only across industries, but also change through time. Nevertheless, we show using Japanese data for metropolitan areas in two time periods that the location intensities of both industries and population are linked by surprisingly simple and persistent patterns. In particular, we identify a strong negative log‐linear relation between the number and the average (population) size of metro areas in which a given industry is found. This relation, which we designate as the Number‐Average Size (NAS) Rule, is also shown to be intimately connected to both the Rank‐Size Rule and Christaller's (1966) Hierarchy Principle applied to metropolitan areas. In particular, we show mathematically that in the presence of the Hierarchy Principle (which holds quite well in Japan) this NAS Rule is essentially equivalent to the Rank Size Rule.     

乡村旅游发展与西部城镇化的互动关系初探

西部大开发,旅游业是重点,城镇化建设也是重点。乡村旅游是旅游业的新分支,也是西部旅游开发的重要方面。本文界定了乡村旅游的内涵,并在分析西部乡村旅游资源和西部城镇化进程的基础上,对乡村旅游发展与城镇化的关系进行了研究,认为乡村旅游的开展促进了西部城镇化的进程,而西部城镇化的进程又为发展乡村旅游开拓了空间,二者之间是作用与反作用的互动关系。为了保持性村旅游于西部城镇化良性关系的协调发展,作者提出了促进二者良性互动的建议。     

PRE-COLUMBIAN METALLURGY: TECHNOLOGY,MANUFACTURE, AND MICROPROBE ANALYSES OF COPPER BELLS FROM THE GREATER SOUTHWEST*

Twenty-four cast copper crotals (commonly called bells), one 'spilled bell’, one tinkler bell and a number of minerals from locations throughout the Greater Southwest were analysed for their elemental composition by a PIXE nuclear microprobe at Los Alamos National Laboratory, New Mexico, USA. Sixteen bells contained minor and trace amounts of silver, antimony, arsenic, lead, and in some cases tin, strontium, and selenium. Nine bells contained little or no detectable amounts of these elements. This suggests that several workshops throughout the Greater Southwest and Mexico might have manufactured these bells.     

火车站及其周边地区空间结构国内外研究进展

工业化背景下,世界铁路运输发展迅速,各种大型火车站在城市迅速崛起,以火车站为中心的城市次中心区域逐渐形成,对火车站的区域影响研究日益引起国内外城市和交通学界的重视。文章首先总结了当前火车站与周边环境关系研究的主要方向和动向,并对国外学者关于火车站地区的土地利用和空间结构、火车站与地区经济发展以及火车站对周边地区的社会影响等研究的主要观点作了较详细的介绍和综述。接着概括和分析了国内学者在火车站与周边环境关系研究的主要方面和内容。最后,针对我国的火车站地区建设和发展提出一些思考和建议。