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排序方式: 共有307条查询结果,搜索用时 31 毫秒
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The Environmental History of Tigray (Northern Ethiopia) in the Middle and Late Holocene: A Preliminary Outline 总被引:1,自引:0,他引:1
Kathryn A. Bard Mauro Coltorti Michael C. DiBlasi Francesco Dramis Rodolfo Fattovich 《African Archaeological Review》2000,17(2):65-86
This paper outlines the environmental history of the Tigrean Plateau (northern Ethiopia) during the Holocene, based on the available geomorphological, palynological, archaeological, and historical evidence. At present, it seems that (1) the plateau experienced a more humid climate with a denser vegetation cover during the Early Holocene; (2) Soil erosion due to clearing vegetation began in the Middle Holocene; (3) agricultural activity was intensified in the Late Holocene, as a consequence of the rise of a state; (4) demographic pressure increased from the early first millennium BC to the mid–first millennium AD, causing soil erosion; (5) environmental degradation and demographic decline occurred in the late first millennium AD; (6) the vegetation cover was regenerated in the early second millennium AD; and (7) progressive vegetation clearance started again in the second half of the second millennium AD.Cet article trace l'histoire ambiante du Plateau Tigréen dans l'Holocène en utilisant les données géomorphologiques, palynologiques, archéologiques et historiques. Il semble que (1) dans l'Holocène ancien le plateau était caractérisé par une phase humide avec une dense végétation; (2) l'érosion causée par l'abbattage de la végétation commen¸a dans l'Holocène moyen; (3) l'activité agricole s'inténsifia à la fin de l'Holocène, par conséquence de l'essor d'un état; (4) la pression démographique augmenta de plus en plus du début du premier millénaire av. J.-Ch. à la moitié du premier millénaire ap. J.-Ch.; (5) la dégradation ambiante et la diminution démographique se vérifièrent à la fin du premier millénaire ap. J.-Ch.; (6) une régéneration de la vegetation se vérifia au début du seconde millénaire ap. J.-Ch.; et (7) l'abbatage de la végétation recommen¸a dans la seconde moitié du seconde millénaire ap. J.-Ch. 相似文献
64.
A simple variational formulation for contact dynamics is adopted to investigate the dynamic behavior of planar masonry block structures subjected to seismic events. The numerical model is a two-dimensional assemblage of rigid blocks interacting at potential contact points located at the vertices of the interfaces. A no-tension and associative frictional behavior with infinite compressive strength is considered for joints. The dynamic contact problem is formulated as a quadratic programming problem (QP) and an iterative procedure is implemented for time integration. Applications to analytical and numerical case studies are presented for validation. Comparisons with the experimental results of a masonry wall under free rocking motion and of a small scale panel with opening subjected to in-plane loads are also carried out to evaluate the accuracy and the computational efficiency of the formulation adopted. 相似文献
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Anna Fedrigo Markus Strobl Alan R. Williams Kim Lefmann Poul Erik Lindelof Lars Jørgensen Peter Pentz Dominik Bausenwein Burkard Schillinger Anton Kovyakh Francesco Grazzi 《Archaeological and Anthropological Sciences》2018,10(6):1249-1263
We present novel imaging results from a non-invasive examination of three ‘pattern-welded’ swords from the Viking Age belonging to the National Museum of Denmark, using white beam and energy resolved tomographies with neutrons. Pattern-welded blades are made by forge welding together thin strips of iron and steel that were twisted and joined in various ways, producing a decorative pattern on the surface. The study shed light on the inner structure of the composite material and manufacturing techniques of these admired examples of past technology, revealing some otherwise invisible details of their assembly methods, phase distribution and extent of the corrosion. 相似文献
66.
Marcella Di Bella Francesco Italiano Maria Clara Martinelli Paolo Mazzoleni Simona Quartieri Gabriella Tigano Alessandro Tripodo Giuseppe Sabatino 《Archaeological and Anthropological Sciences》2018,10(7):1571-1583
The results of a petrographic and geochemical study carried out on archeological grindstones allow to provide new constraints on protohistoric commercial exchanges over the Mediterranean area. Eleven grindstones, discovered in an archeological site located in Milazzo (Messina, Sicily) and dated from the Early Bronze Age, have been investigated by geochemical and petrographic techniques. The raw materials are mainly volcanic rocks characterized by calc-alkaline and K-alkaline affinities with volcanic arc geochemical signature. Only one sample, made of basalt belonging to the Na-alkaline series, shows an intraplate signature. The comparison with the available literature data for similar rocks allowed constraining the volcanic origin of the exploited lavas. While the intraplate-type raw material came from Mt. Etna Volcano (Sicily), the arc-type volcanic rocks are mostly trachyandesites, basaltic andesites, and one rhyolite. Although most of them come from the Aeolian Arc, a provenance of some samples from the Aegean Arc cannot be excluded. This last region could represent the most probable provenance area for the rhyolite sample. 相似文献
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Stephanie R. Simms Francesco Berna George J. Bey 《Journal of archaeological science》2013,40(2):1144-1157
Excavations of a kitchen at Escalera al Cielo in the Puuc Maya region of Yucatán, Mexico uncovered a concentration of fired clay balls (ca. 3–5 cm in diameter), in addition to other de facto domestic refuse. The kitchen pertains to an intensively excavated elite residential group that was rapidly abandoned sometime near the end of the Terminal Classic period (A.D. 800–950), resulting in floor assemblages that provide an opportunity to explore the types and distribution of daily household activities. The results of experimental replications and a suite of analyses comprising modal analysis, ceramic petrography, Fourier transform infrared spectroscopy (FTIR), and microbotanical residue analysis reveal aspects of clay preparation, firing temperatures, repeated use of the balls, firing conditions, and specific plant food or fuel residues adhering to them. We show that the fired clay balls were manufactured with local, clay-rich soil and employed by the inhabitants of Escalera al Cielo as heating elements; relatively high concentrations of microbotanical residues from edible plants adhering to them support the hypothesis that they were involved in kitchen activities related to food processing. 相似文献
69.
The Eneolithic Cucuteni–Trypillia mega-sites were undoubtedly the largest residential agglomerates in southeastern Europe from c. 4100 to 3400 cal BC. Their sheer size and estimated population have triggered animated discussion of whether or not they should be regarded as ‘proto-cities’. Considering trajectories of change in, for instance, density of dwellings and settlement size, this paper discusses a series of issues that will help the reader decide in which category these large sites should be placed, while at the same time examining the arguments for and against Trypillia low-density settlement patterns, recently problematized by Chapman and Gaydarska (2016). 相似文献
70.
Contextualizing marriage: conjugality and Christian life in Jonas of Orléans' De institutione laicali
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Francesco Veronese 《Early Medieval Europe》2015,23(4):436-456
The De institutione laicali by Jonas of Orléans has frequently been examined as a source for conjugal life in the Carolingian period, but rarely analysed in its entirety. In this article I propose an overall reading of the text, based on the version addressed to Count Matfrid before 828, in order to place the chapters about marriage in their context. I will formulate new interpretations of its purposes – arguing that Book II was configured as a speculum comitale – and of Jonas's view of marriage. The De institutione laicali will therefore be shown to have served the needs of Carolingian representations of society and public power. 相似文献