Search results for "XRF"
showing 10 items of 106 documents
Volcanic products of Lipari (Aeolian islands, Italy): Multivariate analysis of petrographic and radiometric data
2010
Abstract A petrographic and radiometric study, along with statistical multivariate analysis of volcanic products of the island of Lipari (Aeolian islands, Italy) was carried out. The volcanological history of Lipari was reconstructed defining two stages (pre- and post-erosive stages) further on subdivided in four volcanic phases, each of which characterized by products with a particular chemical composition and separated by stratigraphic unconformities. The correlations between petrographic features, determined by X-ray fluorescence, and volcanological history of the island highlight a gradual differentiation with younger rocks showing a more acid chemical composition than the older ones. R…
XRF and LIBS integrated analysis to identify the chemical composition and the conservation state of photographic and paper materials
2015
Ori e cromie dei marmi rinascimentali di Palazzo Abatellis: indagine non invasiva tramite spettrometria XRF.
2009
Nuevos desarrollos de la espectroscopia para el análisis mineral de alimentos
2017
El trabajo recopilado en la siguiente Tesis Doctoral está basado en el desarrollo de nuevas metodologías para la determinación de elementos minerales en distintos alimentos y dietas, siguiendo los principios de la “Química Verde”: rapidez, bajo coste, simplicidad y respeto por el medio ambiente. Esta Tesis se ha realizado acogiéndose a la modalidad “compendio de publicaciones”, contemplada en el Reglamento de la Universidad de Valencia de 28/16/2016 (ACGUV 172/2016) y se ha dividido en dos secciones: la sección I, que incluye un resumen global de la temática, resumen de los principales resultados obtenidos, así como las conclusiones finales. A continuación, en la sección II se incluyen los …
X-ray Fluorescence Spectroscopy applied to the study of three sicilian painted artworks
2009
This paper reports on three X-Ray Fluorescence (XRF) studies of ancient Sicilian painted materials: a 13th century canvas from Cerami (Enna, Italy), the Muqarnas wood ceiling of the 12th century Palatine Chapel (Palermo, Italy) and a delicate early 20th century viola d’amore, the property of the Conservatorio di Musica “Vincenzo Bellini” in Palermo. Information about the pigments and preparation layer mixtures used as well as inferences regarding various past painting techniques emerged from the interpretation of spectra and data analyses.
Luonnontieteellisin analyysimenetelmin tunnistettu Akseli Gallen-Kallelan väripaletti
2020
Artikkeli on kokonaisuudessaan ensimmäinen laatuaan Suomessa ja se esittelee tutkimuksen tuloksia koskien Akseli Gallen-Kallelan käyttämiä väriaineita. Tutkimusaineisto on läpileikkaus taiteilijan taiteellisesta tuotannosta vuosilta 1880–1929. Se koostuu 265:stä maalauksesta ja 83:sta öljy- ja temperavärituubista. Tutkimuksessa käytetyt analyysimentelmät ovat ainetta tuhoamattomia luonnontieteellisiä analyysimenetelmiä: energiadispersiivinen röntgenfluoresenssi spektroskopia (EDXRF) ja polarisaatiomikroskopia (PLM).
 
 Avainsanat: Akseli Gallen-Kallela, taiteilijatarvike, väriaine, pigmentti, taiteen materiaalitutkimus, EDXRF, polarisaatiomikroskopia.
Composición, estructura interna y transporte electrónico de nanohilos individuales de In1-xGaxN e InN
2014
La posibilidad de sintonizar la banda prohibida de las aleaciones de In1-xGaxN desde el UV al IR variando x desde 0 a 1 es la base para potenciales aplicaciones de esta aleación como diodos emisores de luz (LEDs), del inglés “light emitting diodes”, diodos láser (LDs), del inglés “laser diodes” o células solares. Sin embargo, las inhomogeneidades en la composición y la segregación de fases, debido no sólo a la fata de sustratos con coeficientes de expansión térmica que se ajusten a los del InN y el GaN, sino también a la baja temperatura de disociación del InN comparada con la del GaN, dificulta el crecimiento de capas de alta calidad en todo el rango de composiciones. Con el objetivo de su…
Assessment of genetically modified oilseed rape MS8, RF3 and MS8×RF3 for renewal of authorisation under regulation (EC) No 1829/2003 (application EFS…
2017
Efsa Panel On Genetically Modified Organisms (gmo)Opinion scientificRequestor: European CommissionQuestion number: EFSA-Q-2016-00569; Following the submission of application EFSA-GMO-RX-004 under Regulation (EC) No 1829/2003 from Bayer CropScience, the Panel on Genetically Modified Organisms of the European Food Safety Authority (GMO Panel) was asked to deliver a scientific risk assessment on the data submitted in the context of the renewal of authorisation application of the genetically modified (GM) herbicide-tolerant oilseed rape MS8, RF3 and MS89RF3. The data received in the context of this renewal application contain post-market environmental monitoring reports, systematic searches and…
The panel painting represinting Madonna con bambino e San Giovanni of Museo Diocesano of Palermo: Scientific studies for the restoration
2017
The present research focuses on a painting on wood representing the Madonna con Bambino e San Giovanni, attributed to an unknown artist belonging to the Cretan-Venetian school, dated to the end of 16th century. The aim of the study is to provide a complete knowledge of the characteristics of the artefact in order to plane and perform a procedure according to conservative restoration. Historical and artistic evaluations and technical investigations were carried out for identifying the context, the constitutive materials and the executive techniques. The study was supported by the application of non-invasive (multispectral investigations and X-ray Fluorescence Spectroscopy) and analytical tec…
Tecniche spettroscopiche integrate per lo studio di pigmenti storici
2011
Tra le tecniche spettroscopiche per lo studio dei pigmenti storici, la fluorescenza a raggi X (XRF) e la spettroscopia mediante ablazione laser (LIBS) risultano complementari per le informazioni fornite in termini composizionali e di spessori indagati. A differenza dell'analisi XRF, la LIBS permette l'identificazione degli elementi chimici a basso Z e, attraverso impulsi laser consecutivi, consente di ricostruire la stratigrafia caratteristica del campione. Sono state condotte analisi spettroscopiche su frammenti di pitture murali provenienti da diversi siti e su pigmenti in polvere. I risultati hanno permesso di valutare le potenzialità, in campo archeometrico, della tecnica LIBS rispetto …