1,721,065 research outputs found
Science for Cultural Heritage. Technological Innovation and Case Studies in Marine and Land Archaeology in the Adriatic Region and Inland - August 28-31, 2007 - Veli Losinj, Croatia
No full textMicroCT imaging of Red Fox talus: a non-destructive approach to age at death estimation
No full textX-ray microCT imaging offers the possibility to study age-related changes of bone microstructure. In the present paper we analyse the talus of 15 modern red foxes of different ages, from 2 months old to adulthood, to investigate the possibility of identifying their different ages at death. Surface and volumetric variables describing bone properties are measured or evaluated from the microCT images following three approaches: (i) the bone volume to total volume ratio, quantified for the whole bones; (ii) two homologous subvolumes of trabecular tissue, virtually extracted and analysed to evaluate trabecular bone structure; and (iii) the development of the cortical region, deduced through the analysis of bone cross-sections. All approaches yielded interesting information on bone development, and preliminary results show that the third approach clearly allows us to discriminate among different age groups. This is important both from a zooarchaeological and a palaeontological perspective, suggesting that microCT imaging can be considered a new non-invasive tool to estimate the age at death of animal remains, or to discriminate taxa characterized by a close morphology but different adult body size
Energy-dispersive X-ray fluorescence and diffraction portable system for cultural heritage applications
No full textA portable X-ray diffraction (XRD) and X-ray fluorescence (XRF) system, based on energy dispersive detection in reflection geometry, has been developed for the non-invasive study of cultural heritage materials. This analytical system is an open-work platform based on a low-power miniaturized X-ray tube (Ag anode), a single Si-drift detector, and a set of collimators that have been mounted on a compact and versatile manual or motorized stage, which allows independent and precise angular positioning of both source and detector and the study of complex geometry objects. The design of two instruments and experimental setups, and their advantages are discussed. The XRF and XRD analytical performance has been tested through the analysis of standard reference materials and some applications, including provenance study of obsidian and 'green stone' artifacts, identification of pigments in a model of fresco painting, and chemical element analysis of bones. The main advantages of portable energy dispersive X-ray diffraction systems compared with commonly used angle dispersive X-ray diffraction (ADXRD) instruments are shorter measurement times and compactness. Moreover, optimum XRF spectra can be collected because a polychromatic beam is used instead of a (quasi) monochromatic beam as in an angle dispersive X-ray diffraction-X-ray fluorescence portable system. Results demonstrate that it is possible to identify the main crystalline phases in a measurement time of 100s-600s and the system is sensible enough for answering common questions, as the ones presented, in the cultural heritage field
A SYNCHROTRON RADIATION MICROPROBE FOR X-RAY-FLUORESCENCE AND MICROTOMOGRAPHY AT ELETTRA
No full textMicroCT analysis of archaeozoological remains: a non-destructive approach to the age estimation
No full textNuove metodiche strumentali nell’indagine dell’origine e dell’evoluzione del linguaggio umano: correlazione fra micromorfologia, microstruttura ed impegno biomeccanico dell’osso ioide nei Primati non umani, in uomini fossili e attuali.
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Microct Imaging of Red fox Talus: A Non-Invasive Approach to Evaluate Age at Death
No full textX-ray microCT imaging offers the possibility to study age-related changes of bone microstructure. In the present paper we analyse the talus of 15 modern red foxes of different ages, from 2 months old to adulthood, to investigate the possibility of identifying their different ages at death. Surface and volumetric variables describing bone properties are measured or evaluated from the microCT images following three approaches: (i) the bone volume to total volume ratio, quantified for the whole bones; (ii) two homologous subvolumes of trabecular tissue, virtually extracted and analysed to evaluate trabecular bone structure; and (iii) the development of the cortical region, deduced through the analysis of bone cross-sections. All approaches yielded interesting information on bone development, and preliminary results show that the third approach clearly allows us to discriminate among different age groups. This is important both from a zooarchaeological and a palaeontological perspective, suggesting that microCT imaging can be considered a new non-invasive tool to estimate the age at death of animal remains, or to discriminate taxa characterized by a close morphology but different adult body size
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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