1,721,009 research outputs found
Two archeometric methods for cellulosic textile finds using enzymatic tests. Science and technology in archeology and conservation.
No full textin Proceeding of "SCIENCE AND TECHNOLOGY IN ARCHEOLOGY AND CONSERVATION", Amman-Petra, Acta. Fundacion el Leg. Andalusi (Ed.), Spain, 12-18/08/2002, Proceeding
Analytical interpretation on different clay materials from the site of Ighrama Aousser (Morocco)
No full textThe data collected on the furnace material lead to hypothesize that the local artisans were familiar with the local materials and their technological characteristics. The analysis performed on the pottery fragments distinguished two classes of pottery with different refinement of the mixture: the one less refined for common use in the preparation and storage of food, and the one more refined for the upper- class use. All these data, connected with the particular assessment of the Citadel, reinforce the hypothesis of this Site as an important economic centre for metal extraction and processing
Hardness determination in submicron films of refractory carbides on titanium.
No full textEvaluation of the actual hardness of thin films was performed. The method is based on measurements of the hardness value in the composite system film/substrate and following isolation of the film hardness using the rule of mixts. over the surface and with allowance for size effect of indentation. Expts. were performed using thin (200-530 nm) carbide films of V, Zr, Hf, and Ta formed on Ti substrate using electron beam deposition. Correct ranging of indenter loads provides the results close to the hardness values obtained for corresponding compact ceramic materials
Interpretazioni analitiche su varie tipologie di materiali ttili dal sito di Ighram Aousser (Marocco)
No full textThe data collected from different instrumental investigations demonstrated the validity of the analytical procedure designed to contribute to the identi cation of metallurgical activity inside and outside the walls of the Fortress of Ighram Aousser, in the past. Some data con rm the archaeological hypothesis, while others indicate original paths for the determination of the metalwork in the mine area. In particular, the results obtained on the ceramic fragments led to the identi cation of a large class of commonly used items. A re ned little dough due to daily function for food preparing characterizes the large group of pottery fragments, instead the group characterized by more re ned body is connected with to a higher-class use. These results, connected with the particular arrangement of the fortress that presents a residential and administrative area, enforce the archaeological hypothesis about the economic importance of this site
Two archaeometric methods for cellulosic textile finds usiong enzymatic test
No full textin Science and Technology in Archaeology and conservation, T.S. Akasheh (ed.), Spai
Calcium phosphate and fluorinated calcium phosphate coatings on titanium deposited by Nd : YAG laser at a high fluence
No full textCalcium phosphate coatings are known to enhance long-term fixation, reliability and promote osteointegration of cementless titanium-based implant devices. This study was aimed at the pulsed laser deposition of calcium phosphate coatings onto titanium using hydroxyapatite and hydroxyapatite-fluorapatite targets. The deposition was carried out at the high laser beam fluence conditions, about 12 J/cm2. The coatings were characterized with respect to their morphol., phase compn. and hardness. X-ray energy dispersive anal. revealed the coatings retain their elemental compn., and fluoride content within the film is the same as in the initial target. However, unlike sintered targets, the deposited films contain no apatite-like phases. The hardness of the films, about 18 GPa, is surprisingly high compared to that of hydroxyapatite and hydroxyapatite-fluorapatite ceramic targets. The deposited coatings of 2.7-2.9 μm thickness have uniform and dense microstructure, contg. the solidified droplets of the expulsed from the target phase. The uncommon structure and hardness of the films can be attributed to the melting and phase decompn. of the initial material in the laser plasma
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