Giolj Guidi - Academia.edu (original) (raw)

Papers by Giolj Guidi

Atti della Accademia Nazionale dei Lincei. Rendiconti Lincei. Scienze fisiche e naturali, Sep 1, 1990

I diaspri manganesiferi metamorfosati in facies di zeoliti della miniera di Molinello presso Chia... more I diaspri manganesiferi metamorfosati in facies di zeoliti della miniera di Molinello presso Chiavari (Genova) contengono un minerale del gruppo della ganofillite in cui Ca ľ Na ≪ K. Esso forma lamelle verdi chiare a contorno esagonale entro vene in cui e concresciuto con quarzo, parsettensite nambulite, rame nativo e serandite (?). La sua composizione chimica si inquadra in quella generale del gruppo, pur nella prevalenza del Ca e nella sostituzione di Cu per Mn. La sua simmetria e pero ortorombica: cio comporta il dimezzamento dei parametrib ec della cella elementare rispetto ai termini noti.

Atti della Accademia Nazionale dei Lincei. Rendiconti Lincei. Scienze fisiche e naturali, Sep 1, 1990

... FS Stoppani, also a well-known amateur mineralogist. ... Prof. PF Zanazzi (Perugia) is determ... more ... FS Stoppani, also a well-known amateur mineralogist. ... Prof. PF Zanazzi (Perugia) is determining the crystal structure of our mineral and kindly informed us on some of his results.Fabio Melchiorri greatly helped in the mineral separation. Page 5. ...

Archaeometry, 2007

Painted terracotta slabs, which are characteristic of Etruscan art, are much less known than the ... more Painted terracotta slabs, which are characteristic of Etruscan art, are much less known than the funerary frescoes of the Etruscan necropolis, and have never been studied by advanced diagnostic techniques. To get information on the manufacturing methodology of these important works of art, detailed micro-Raman and X-ray diffraction measurements were performed on a polychrome terracotta slab representing a warrior, found in the ancient Etruscan town of Ceri. We have found that the terracotta slab, which was made using a calcium-poor clay, was fired at a temperature in excess of 800 ° C. For the polychrome, we have identified red ochre, azurite, yellow ochre, burnt umber and carbon black pigments, and we propose the use of kaolin as a white pigment, thus providing a reliable, although not definitive, description of the colour palette. On the basis of the obtained results, which do not reveal the presence of organic binders, we propose that a second firing procedure was carried out on the work of art at between 250 ° C and 300 ° C, in order to fix the pigmented layers.

Museu de Astronomia e Ciencias Afins, Jul 1, 2005

Frequently one finds black spots on pottery, glass, and bones from archaeological sites. These bl... more Frequently one finds black spots on pottery, glass, and bones from archaeological sites. These black stains of dendritic shape, anchored to porous surfaces, can hamper interpretation of artistic artifacts. The removal of these stains, until now, has been a serious problem. Using x-ray diffraction, scanning electron microscopy (SEM), and EPMA, the black spots were identified as manganese dendrites. The authors present the first results of a new chemical compound with reducing action and neutral pH, BDG 86, that quickly removes these black spots. To verify the efficacy of this chemical compound, the cleaning solution was analyzed after treatment by a continuous flux Autoanalyzer and AAS. The analyses confirmed that BDG 86 is an efficacious, quick acting, and harmless treatment for artifacts.

This paper deals with the application of scanning electron microscopy (SEM), x-ray fluorescence (... more This paper deals with the application of scanning electron microscopy (SEM), x-ray fluorescence (XRF), INA, and proton-induced x-ray emission (PIXE) analytical techniques to paper showing foxing marks. The reasons for the appearance of foxing are not yet fully understood nor is it known how its damage could be prevented. Recent research, including that by F. Gallo and G. Pasquariello, indicates a possible biological cause. Other researchers have proposed that the presence of iron and other heavy metals might be among factors favoring the development of foxing. Analysis of several paper samples was performed at different locations on the samples to determine the relationship between the visual appearance of the paper and its chemical composition. Foxing marks can be reproduced for experimental use by storing under specific conditions, suitable unmarked papers which have been contaminated with metals. Non-destructive analysis would aid in selection of samples for storage. Restoration ...

Rendiconti Lincei, 1990

by Eugenio Cerilli, Giovanni Carboni, Elena Carletti, Cecilia Conati Barbaro, Massimo Cultraro, Antonio Curci, Alessandra Facciolo, Agnese Livia Fischetti, Chiara La Marca, Nadia Marconi, Vittorio Mironti, Rachele Modesto, Stefania di Giannatonio, Giolj Guidi, Cristiano Iaia, and Marco Mulargia

Roma Prima del Mito - Abitati e necropoli dal Neolitico alla prima età dei metalli nel territorio di Roma (VI-III millennio a.C.), a cura di Anna Paola Anzidei e Giovanni Carboni, 2020

The area corresponding to the modern city of Rome is usually known for the magnificent remains of... more The area corresponding to the modern city of Rome is usually known for the magnificent remains of the Roman civilization and the myths of its foundation in 753 BC. Less known is evidence of the prehistoric occupation occurring until the Bronze Age along the territory corresponding to the city of Rome and the surrounding area, called "Campagna Romana". Indeed, until a few years ago, the archaeological evidence relating to the phases of recent prehistory, from the Neolithic to the beginning of the Bronze Age, were completely, or almost completely, unknown. Recent excavations, mainly related to preventive archaeology, led to the identification of settlements and necropolises associated with a complex cultural scenario and shed light on the social and cultural aspects of daily life of the human groups who occupied this territory before the Latium civilization.

Della città di Roma, ben nota per le maestose vestigia riguardanti la civiltà romana e per i miti che precedono la sua fondazione avvenuta nel 753 a.C., sono poco conosciute le fasi antecedenti l’età del Bronzo finale , sia nell’area urbana, che nel territorio al di fuori delle mura, definito come “Campagna Romana” che va dal Neolitico antico fino agli inizi dell'età del Bronzo. Scavi recenti, legati principalmente all’archeologia preventiva, hanno portato all’individuazione di insediamenti e necropoli riferibili ad un complesso ed articolato panorama culturale, gettando luce su aspetti della vita quotidiana, sociale e culturale di gruppi umani che hanno occupato questo territorio prima della formazione della civiltà laziale.

Atti della Accademia Nazionale dei Lincei. Rendiconti Lincei. Scienze fisiche e naturali, Sep 1, 1990

Archaeometry, 2007

Museu de Astronomia e Ciencias Afins, Jul 1, 2005

Rendiconti Lincei, 1990

Roma Prima del Mito - Abitati e necropoli dal Neolitico alla prima età dei metalli nel territorio di Roma (VI-III millennio a.C.), a cura di Anna Paola Anzidei e Giovanni Carboni, 2020