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Search Results: 1 - 10 of 1197 matches for " Metallic artefacts "
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Artefacts in cone beam CT  [PDF]
Prashant P. Jaju, Mayuri Jain, Ajita Singh, Akanksha Gupta
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.35049
Abstract:

Cone beam computed tomography (CBCT) is the modern third dimension applied in the field of oral maxillofacial region. With lower radiation dose compared to conventional CT, its applications in dentistry has increased tremendously. Artefacts can seriously degrade the quality of computed tomographic (CBCT) images, sometimes to the point of making them diagnostically unusable. To optimize image quality, it is necessary to understand why artifacts occur and how they can be prevented or suppressed. CT artifacts originate from a range of sources; physical based, scanner based and patient based. This article highlights the causes of artefacts on CBCT images and methods to avoid them.

Film-Screen Radiographic Artefacts: A Paradigm Shift in Classification  [PDF]
T. Adejoh, S. W. I. Onwuzu, F. B. Nkubli, N. C. Ikegwuonu
Open Journal of Medical Imaging (OJMI) , 2014, DOI: 10.4236/ojmi.2014.43015
Abstract:
Objective: To propose a new method of classifying film-screen radiographic artefacts. Methodology: A prospective study was carried out at the Radiology Department of a University Teaching Hospital in Nigeria between June, 2011 and June 2013. Radiographs were assessed with the aid of a viewing box for artefacts which were arranged according to prior classifications by other researchers. They were subsequently grouped according to pre-arranged format into the new classification. Result: The following groups were observed: packaging (dark), procedure (greyscale), patient (greyscale), pre-processor (dark), processor (greyscale) and post-processor (greyscale). Conclusion: Classification of artefacts based on appearance and stage of introduction into film is easier to understand and remember.
Archaeological parks: what are they?
Paulette M. McManus
Archaeology International , 1999, DOI: 10.5334/ai.3017
Abstract: Most in-situ conservation and presentation of archaeological sites focuses more on the monuments and other artefacts themselves than on them and the landscapes of which they are a part. The concept of an archaeological park can overcome this limitation. In this personal view of what constitutes an archaeological park, the intellectual roots and contemporary meaning of this relatively new concept are explored.
Conserving Roman artefacts from a settlement in Essex
Amanda Sutherland
Archaeology International , 1998, DOI: 10.5334/ai.0208
Abstract: Recent rescue excavation on land scheduled for housing produced an exceptionally large and diverse assemblage of Roman artefacts, including over 3,000 coins and other metal objects. Here one of the Institute's conservators, who is contracted to work for projects funded by English Heritage, describes her approach to conserving the coins, as well as several well preserved pewter and copper-alloy items of Roman tableware.
Cambio de rumbo. Interacción comercial entre el Bronce Final atlántico ibérico y micénico en el Mediterráneo Central (1425-1050 a.C.)
Mederos Martín, Alfredo
Trabajos de Prehistoria , 1997,
Abstract: The aim of this work is to present a new interpretation on the commercial exchanges during the Late Bronze Age IC-IIC, c. 1425-I050 BC, between the Western and Central Mediterranean, starting from a review of two types of metallic artefact, axes and swords, originating from the Iberian Peninsula, and present in Sardinia, Sicily and Lazio in the Italian Peninsula. We start from three premises: the calibrated chronology of the Late Bronze Age in the Iberian Peninsula, Sardinia and Sicily-Eolian. Secondly, a more accurate chronology of the Iberian artefacts present in Italian settlements and deposits. And finally, the analysis of the confluence between the Atlantic and Mycenaean trade in the Central Mediterranean, particularly during the Late Bronze Age IC-IIA/Late Helladic IIIA-IIIB, c. 1425-1225 BC, to reveal that the mycenaean pottery presence in Andalusia can not be tried as an isolated phenomenon, but is integrated within the commercial interrelationship that existed between the Western and Eastern Mediterranean around the islands of Sardinia and Sicily in the Central Mediterranean. El objetivo de este trabajo es ofrecer una nueva interpretación sobre los intercambios comerciales durante el Bronce Final IC-IIC, ca. 1425-1050 AC, entre el Mediterráneo Occidental y Central, a partir de una revisión de dos tipos de artefactos metálicos, hachas y espadas, procedentes de la Península Ibérica, y presentes en Cerde a, Sicilia y el Lazio en la Península Italiana. Se parte de tres premisas; la primera, la cronología calibrada del Bronce Final en la Península Ibérica, Cerde a y Sicilia-Eolias. En segundo lugar, un encuadre temporal más preciso de los artefactos ibéricos presentes en los yacimientos y depósitos italianos. Y finalmente, el análisis de la confluencia del comercio atlántico y micénico en el Mediterráneo Central, particularmente durante el Bronce Final IC-IIA/ Heládico Final IIIA-IIIB, ca. 1425-1225 AC, para poner en evidencia que la presencia de cerámicas micénicas en Andalucía no puede tratarse de un fenómeno aislado, sino que se integra dentro de la interrelación comercial que existió entre el Mediterráneo Occidental y Oriental alrededor de las islas de Cerde a y Sicilia del Mediterráneo Central.
Mecanismo de corros?o em numismas de época romana provenientes da Senhora do Castelo
Martins,C. M. B.; Martins,J. I.;
Corros?o e Protec??o de Materiais , 2009,
Abstract: the corrosion products on bronze roman coins of cu-base alloys from senhora do castelo, dated of 4th century, have been characterized by means of optical microscopy (om), scanning electron microscopy combined with energy dispersive spectrometry (sem-eds), energy dispersive x-ray fluorescence (edxrf), and x-ray diffraction (xrd). chemical composition of the coins was also examined. the eds and xrd data show that lead has a high rate of corrosion, which in interaction with the environment is later precipitated as a complex chlorine-phosphate of lead with a yellow-greenish hue (pyromorphite).
Análise dos Produtos de Corros?o de uma Moeda Medieval Procedente do Monte da Senhora do Castelo
Martins,C. M. B.; Martins,J. I.; Ferreira,J. A.;
Corros?o e Protec??o de Materiais , 2010,
Abstract: the medieval time in the hill of senhora do castelo is well studied in the detected archaeological vestiges: a church and necropolis of middles of the 12th century. in this context, various materials have been exhumed in the same chronological age that witnessed this sacred space, but also stage of the political instability prevailing at the time. one such material is a coin of d. afonso ix de le?o. the corrosion products developed on the coin during the archaeological burial was studied by means of optical microscopy (om), scanning electron microscopy combined with energy dispersive spectrometry (sem-eds), energy dispersive x-ray fluorescence (edxrf), and x-ray diffraction (xrd). the results show the presence of cuprite, atacamite, chalcocite, silver oxide, silver sulphide and native silver, which allows deducing the importance of the environment in the deterioration of metallic artefact.
Olhares que fazem a "diferen?a": o índio em livros didáticos e outros artefatos culturais
Oliveira, Teresinha Silva de;
Revista Brasileira de Educa??o , 2003, DOI: 10.1590/S1413-24782003000100004
Abstract: the text discusses how "indians" are presented as distinct based on ways of looking as materialised in textbooks, stamps and postcards, etc. marking the pedagogical function of apparently banal artefacts. the article is divided into three thematic segments: the first is related to the diverse ways in which the 'other' is seen, the second, to the transposition of meanings attributed to objects and the third discusses the representation of indians by means of postcards, phonecards and national coins, as 'authentic' brazilians and patrimony of the nation. the framework that supports this approach is related to the field of cultural studies in a post-modern perspective. in this sense, the concepts articulated in these productions were analysed as a set of established discursive practices based on 'relations of power'.
Comparison of free breathing versus breath-hold in perfusion imaging using dynamic volume CT
Sonja Kandel,Henning Meyer,Patrik Hein,Alexander Lembcke,Jens-C. Rueckert,Patrik Rogalla
Insights into Imaging , 2012, DOI: 10.1007/s13244-012-0169-9
Abstract: Image registration is crucial for CT perfusion imaging.
La fantasía en los artefactos culturales
Stella Maris Poggian,Ricardo M. Haye
Contemporanea : Revista de Comunica??o e Cultura , 2010,
Abstract: At Universidad Nacional del Comahue (Argentina), a research team in the Social Communication Department analyses the traces of fantasy in a text with different formats. This article deals with conceptualizations on the fantastic, it postulates that it is an attractive platform to look upon reality from a different perspective, and redeems it in terms of its contribution to knowledge, imaginative development and the combat against dogmas. The contribution of fantasy reveals itself when we delve into our own humanityand confront the uncertainty of our existence through a variety of artifacts offered to us by technological development applied to information and communication, to coordinate interaction between human beings and the physical world.
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