Search results for "Bronze"
showing 10 items of 339 documents
La utilización de marfil de cachalote en el Calcolítico de Portugal
2013
Scientific analysis were undertaken within a research project concerning ivory objects from the Chalcolithic to Early Bronze Age of the Iberian Peninsula. In several of the analyses of objects from Portuguese Estremadura, especially V-perforated buttons, we could detect for the first time the presence of sperm whale ivory. This highlights the advantage and necessity of scientific analysis of ivory. It also clearly demonstrates that not all ivory used was ivory from African or Asian elephants, but we also did find ivory from the extinct Elephas antiquus, the hippopotamus and in this case sperm-whale. Thus, already in the Chalcolithic the raw material provenience was highly diverse, which in …
Mo-W-containing tetragonal tungsten bronzes through isomorphic substitution of molybdenum by tungsten
2010
Mixed metal oxides based in Mo(W)–Nb–V–Te with tetragonal tungsten bronze (TTB) structure have been synthesized by a hydrothermal method from aqueous solutions of the corresponding Keggin-type heteropolyacids and further heat-treatment in N2 at 700 ◦ C. The materials have been characterized by several physico-chemical techniques, i.e. XRD, Raman, FTIR, SEM-EDS, and TEM. This procedure allows controlling the chemical species to be distributed in the different interstices of the TTB skeleton, which is a key factor to regulate the catalytic properties of the final solid. In this sense, the isomorphic replacement of Mo by W results in lattice parameter and crystal morphology variation, although…
Recristallisation Dynamique au Cours de la Déformation à Chaud de Quatre Nuances de Bronze à 9% d'Etain
1995
Pour cerner les techniques metallurgiques des artisans protohistoriques, il est necessaire de connaitre les evolutions microstructurales obtenues selon les deformations imposees. La compression a chaud de deux bronzes industriels (contenant soit 0,026% soit 0,26% de zinc) et deux bronzes «archeologiques» (contenant soit 0,5% de soufre soit 0,5% de soufre et 0,5% de plomb) permet les observations suivantes : - Les comportements des bronzes «archeologiques» sont tres similaires : jusqu'a 600°C pour e = 0,1 on n'observe pas de recristallisation ; pour e = 1,2 on observe une recristallisation en collier le long des joints de grains. A 750°C la recristallisation semble homogene dans tout le mate…
Hermé (Seine-et-Marne), Carrière SPM-Synéos d'Hermé : Tranche 6 des diagnostics archéologiques : rapport de diagnostic
2022
L’opération archéologique menée à Hermé, carrière Synéos (SPM) - tranche 6 des diagnostics archéologiques a permis de mettre au jour des occupations diachroniques néolithique et protohistorique.Ce diagnostic s’est déroulé sur deux parcelles distinctes pour une surface globale de 102 922 m2, une première au lieudit le Château Duduit et la seconde au lieudit La Patûre aux Bœufs.Sur l’emprise du Château Duduit nous avons mis au jour un petit amas de vingt-cinq pièces lithiques daté du Néolithique. Le diagnostic de 2022 a permis de mettre au jour une seule chaîne opératoire (débitage d’éclats par percussion dure) réalisée à partir de matériaux locaux pour la fabrication d’outils tels que les ra…
Tell Shiyukh Tahtani, Syria Report of the 2006-09 Seasons
2012
The Italian excavations at Shiyukh Tahtani have recently resumed, revealing a long occupation sequence on the mound’s eastern slope (Area CD). In Trench D23, on the summit, an Iron Age level II building contained a rich array of pottery, sheep knuckle bones, clay ‘bobbins’ and an unstratified Egyptian scarab of Menkheperre. An earlier massive building (LBA ?) was also excavated below the Iron Age II occupation. Halfway down the slope the lower level of a large burnt complex of Middle Bronze I date contained rich finds and various burials characterized by peculiar rituals. Finally, in a deep trench down below the slope, EB I-II remains included niched mud-brick architecture of fine Mesopo…
Early Syrian Bottles
2014
Near Eastern archaeologists are accustomed today to labelling as “Syrian bottles” various kinds of oil/perfume fasks that enjoyed a wide popularity in Syria during the 3rd millennium. Owing to the volatile nature of their contents and the lack of archeometric analysis it has not been possible so far to ascertain whether these vessels were scent or unguent vases. Whatever the case, since they have been found far afeld from the core region of production it is clear that they were a luxury item of long-distance trade and are thus today – if possible misattributions are discarded – a valuable indicator of exchange networks and for establishing synchronisms among distant areas of the ancient Nea…
Tell Shiyukh Tahtani. New light on the Bronze Age sequence
2014
This report briefly describes the latest results of the Italian rescue excavations at Shiyukh Tahtani on the Upper Syrian Euphrates. Fieldwork continued on the eastern slope of the mound, aiming to further investigate the Bronze Age levels. A main operation, halfway down the slope, focused upon the earliest MB I layers, where a group of burials was unearthed, mostly consisting of adult interments in oval pits and child pot burials. A most striking finding was the ‘Spinstress tomb’. At the foot of the slope, the exploration of a mud-brick compound, dating back to the early third millennium BC, continued. Here further remarkable evidence of massive domestic architecture in a fine Mesopotamian…
Plain and luxury wares of the third millennium BC in the Carchemish region: two case-studies from Tell Shiyukh Tahtani
2007
In the last decades the large number of salvage excavations undertaken in north Syria and southeastern Anatolia has generated much interest regarding the role that the culture of the Big Bend of the Euphrates River played during the 3rd millennium BC. the aim of the present paper is to examine some particular pottery assemblages of the second half of the 3rd millennium which can be relevant for a discussion about a putative Carchemish region in the Early Bronze Age.
The excavations at tell el-‘Abd
2019
This volume (marru 5/2) is dedicated to the small finds from Tell el-ʻAbd and to the results of environmental studies (archaeobotany, archaeozoology and anthracology); it continues the final publication of the excavation, which began in 2014 with the presentation of the 3rd-millennium ceramics (AVO 16/2). In that volume, the author, Paola Sconzo, introduced the tell as well as the history and the methodology of its excavation. At present, that is, before the final review of the architecture and the stratigraphy, her statements are still fully valid, and have therefore in the main been inserted under 1.1 The excavations at Tell el-ʻAbd.
Tungsten-titanium mixed oxide bronzes: Synthesis, characterization and catalytic behavior in methanol transformation
2019
[EN] Tungsten oxide bronze-based materials show extremely adaptive structural and compositional features that make them suitable for functional properties modulation. Herein we report the preparation of a series of Ti-containing tungsten oxide catalysts presenting a hexagonal tungsten bronze-type structure. The insertion of Ti4+ within the structure (likely in the octahedral framework of the hexagonal tungsten bronze) leads to an increase in the number of strong acid sites, and the disappearance of W5+ surface species found in the undoped tungsten oxide. With the aim of studying the acid-redox properties of the titled catalysts, the catalytic transformation of methanol has been carried out …