17 research outputs found
Excited states in <sup>75</sup>As
No full text The gamma-ray spectrum of 75Se has been studied with a variety of Ge(Li) detectors. The energies and intensities of 15 lines have been accurately measured. Of these a 24.4 and 468.6 keV transition were substantiated for the first time in the gamma-ray spectrum. Ge(Li)–Ge(Li) coincidence measurements established the newly observed 24.4 keV transition. These experiments also substantiated the 80.8 keV transition (observed for the first time) deduced from electron conversion spectra. The accurate intensity values obtained in this work have been combined with proper literature data and conversion coefficients for various transitions have been determined. These data and recent half-life measurements of some excited states by other workers permitted us to calculate the transition rates in 75As. The data obtained indicate that the 198.6, 279.5, and 400.5 keV levels in 75As exhibit strong collective character, in contrast to the 264.6 keV level, which shows little influence of collective effects. </jats:p
Social memory and ethnic identity: ancient Greek drama performances as commemorative ceremonies
No full textThis thesis is an ethnographic account of ancient Greek drama performances that take place in contemporary Greece. It illuminates an aspect of them that has not been taken into account until today: it treats them as commemorative ceremonies that produce, reproduce, and transmit social memory. The interrelation and interdependence between social memory and ethnic identity construction processes are analysed and it is shown that ancient drama performances, due to specific characteristics, constitute something more than mere theatrical events (as they are defined within the Western tradition). These performances, convey, sustain, and transmit from one generation to the next, perceptions of a glorious culture of the past, and become, for its creators and spectators, occasions for celebrating and remembering their ethnic past
"Multiple historicities" on the island of Crete: the significance of Minoan archaeological heritage in everyday life.
No full textThis thesis seeks to investigate the manifold ways people, as members of different groups, understand, narrate and relate to the prehistoric past of the island of Crete, i.e., what is usually referred to as "Minoan heritage". It explores the various contexts in which Knossos, the best-known and most popular Minoan site in Crete, is "historicised" through experience and perception both inside and outside the boundaries of the site. The research focuses on the ways academic knowledge concerning the archaeological heritage is embedded in social practices. Its aim is to understand ancient Cretan monuments and museum exhibits as active producers of meanings affecting and being affected by current social relations. For this purpose, social anthropology and material culture studies in particular lent me the theoretical and methodological tools to bring archaeology, museums and people into the same field of inquiry. The making of a contested monumental landscape around the archaeological site of Knossos, the appropriation and conceptualisation of Minoan Crete through its official representations, the quest for authenticity during the tourist experience, the performance of local identity in relation to the archaeological heritage, the socially made distinctions between the local, the national and the global, and the diverse associations of Knossos with concepts of tradition and modernity are important themes in this research, all related to a heavily idealised conception of Minoan Crete, produced by the major excavator of Knossos, Sir Arthur Evans, at the beginning of the twentieth century. The thesis is completed with a discussion on Archanes, a Cretan village ten kilometres south of Knossos, where significant Minoan finds and buildings have been unearthed in the last decades. By connecting them to a recently completed conservation programme of local architecture and the "rediscovery of tradition" now occurring in the village, I have attempted to trace the diverse inscriptions of this "emergent" ancient past onto social memory and related identity discourses
Importance of in-situ EDXRF Measurements in the Preservation and Conservation of Material Culture
No full text
Determination of parameters for channeling of protons in SiC polytype crystals in the backscattering geometry
No full textEnergy spectra of protons channeling along the (0001) axis of several SiC polytype crystals (namely 4H, 6H, 15R, 21R) in the energy region E-p = 1.7-2.5 MeV, in the backscattering geometry, were taken and analyzed. Computer simulations based on the assumption that the dechanneling of protons follows an exponential law are in very good agreement with the measured spectra. The obtained results for the two crucial channeling parameters, gimel, the mean channeling distance, and, alpha, the ratio of the stopping powers in the aligned and random mode are compared for the different structures and an attempt is made to explain the occurring similarities as well as the differences, in order to evaluate the use of SiC polytypes as substrates in implantations and thin film depositions. An attempt is also made to correlate the results from the present work to the ones obtained in the past for simpler crystallographic structures, namely Si(100) and Si(111), as well as more complex ones, such as SiO2 (c-axis). (C) 2001 Elsevier Science B.V. All rights reserved
Cross section measurements of the Y89(p,γ)Zr90 reaction at energies relevant to p-process nucleosynthesis
No full textIn beam angle-integrated cross section measurements of the 89Y(p, γ)90Zr reaction were carried out at E p = 1.7-4.8 MeV by using a 4π NaI(Tl) summing detector. The resulting cross sections were used to derive astrophysical 5 factors as well as reaction rates. Cross sections, S factors and reaction rates have also been calculated by means of the statistical model code MOST. A good agreement between theoretical predictions and experimental data was found.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Cross-section measurment of 93Nb(p,gamma) 94Mo in the range 1.4-4 MeV
No full textinfo:eu-repo/semantics/publishe
