1,173 research outputs found
A New Method for Characterization of Natural Zeolites and Organic Nanostructure using Atomic Force Microscopy
No full textIn order to study and develop an economic solution to environmental pollution in water, a wide variety of materials were investigated. Natural zeolites emerge from that research as the best in class of this category. Zeolites are natural materials relatively abundant and non biodegradable, economic and good to perform processes of environmental remediation. This paper contains a full description of a new method to characterize superficial properties of natural zeolites of exotic provenience (Caribbean Islets) with atomic force microscopy (AFM). AFM works with the optical microscope simplicity and the high resolution typical of a transmission electron microscope (TEM). Structural information of mesoporous material is obtained using scanning and transmission electron microscopy (SEM and TEM), only if the sample is conductive, otherwise the sample has to be processed through the grafitation technique, but this procedure induces errors of topography. Therefore, the existing AFM method, to observe zeolite powders, is made in a liquid cell-head scanner, but this work puts in evidence and confirms that it is possible to use an ambient air-head scanner to obtain a new kind of microtopography. Once optimized, this new method allows investigating of organic micelles, very soft nanostructure, of cetyltriammonium bromide (CTAB) upon an inorganic surface such as natural zeolites. It is shown some correlation between SEM microphotographies and AFM 3D images
Il culto del fuoco nello Zoroastrismo
No full textIl presente contributo offre uno sguardo critico sulla concezione mazdaica del fuoco a partire dalla letteratura avestica più antica, per poi seguirne lo sviluppo attraverso sia la tradizione avestico-recente sia quella preservata dalle fonti medio-persiane, sempre alla luce della documentazione classica quanto di quella in altre lingue di essenziale importanza per l'area iranica
Fast and ultrafast spectroscopic investigation of tetracycline derivatives in organic and aqueous media
No full textMicroscopia a forza atomica per lo studio di zeoliti
No full textIn un tempo in cui si parla molto di nanotecnologie, o studio di materiali me soporosi come le zeoliti permette di riscoprire vecchie teorie ed osservare nuovi fenomeni.Materiali naturali non degradabili e facilmente rigenerabili, come le zeoliti, possono essere impiegati, per la loro efficienza e sostenibilità, in processi di bonifica ambientale, in particolare per quanto concerne il
risanamento delle falde acquifere inquinate da composti altamente tossici come idrocarburi e organoclorurati. Tali materiali sono già ampiamente utilizzati, quali eccellenti scambiatori ionici, per la rimozione dell’ammonio dalle acque reflue. In questo lavoro vengono studiate le modifiche strutturali prodotte dalla perfusione di tensioattivo in una zeolite naturale di provenienza esotica (Cuba) mediante l’utilizzo della microscopia a forza atomica (AFM). Tale tecnica coniuga la semplicità e la versatilità della microscopia ottica, con le prestazioni tipiche di un microscopio elettronico a trasmissione (TEM) potendo raggiungere una risoluzione spaziale pari a una decina di nanometri.
Il presente lavoro è articolato su due problematiche: la messa a punto di un metodo di osservazione delle zeoliti con con l’APM Nanoscopo III della Digital Instruments e lo studio delle modifiche indotte sulle zeoliti da soluzioni di tensioattivo. In futuro è prevista la messa a punto di un metodo statistico di correlazione dei dati per l’interpretazione delle immagini grazie alle figure caratteristiche delle strutture che si presentano a scale nanometriche
The pictorial wit of Domenico Tiepolo
No full textThis thesis takes a new approach to Domenico Tiepolo’s (1727-1804), Divertimento Per li Regazzi (c.1795-1804), it is arguably the artists most enigmatic graphic work, which features the commedia dell’arte character Pulcinella. The drawings have hitherto been subject to rigorous connoisseurial analysis. Indeed, in his introduction to ten of the drawings in a catalogue of Italian Eighteenth-Century Drawings in The Robert Lehman Collection at the Metropolitan Museum of Art, New York, James Byam Shaw states that this particular series of drawings has now become so famous ‘that it is hardly necessary to add to the literature of the series.’1 In my opinion it would be a great pity if future generations of scholars were discouraged by this remark, for I believe the drawings still have much to ‘tell’ the contemporary art historian and would further benefit from increasingly interpretative readings. Previously, scholars have regarded Domenico Tiepolo as an imitator of his father, Giambattista Tiepolo (1696-1770), and interpreted the re-appropriation of motifs in the Divertimento as signs of old age and fatigue. I suggest, on the contrary, that in this series of drawings in particular, Domenico was an innovator.
This project carves out new territories within the study of the series in that it focuses on the playful nature of the drawings, and how the suite can be understood in relation to contemporary theory concerning games and play, and ludic musical/improvisatory forms. Additionally, the drawings are discussed as a case history in a now popular emerging dialectic on the late works of aged artists: here I consider how these drawings, often funny, poignant, sensitive and delicate reveal how the elderly painter reconciles himself not only to the passing of his own life and the extinction of his family line but to an entire political, cultural and visual tradition
Transcending Giambologna: Domenico Pieratti and his experiments
No full textThe author maps out the career of Domenico Pieratti (Florence, 1600 - Rome, 1656), sheding light on this remarkable brilliant and highly original sculptor at the service of the Medici and Barberini
Domenico Venier's Poetics and Petrarchism in Sixteenth-Century Veneto
No full textreservedIl presente elaborato si propone di indagare il fenomeno del petrarchismo cinquecentesco in area veneta, concentrandosi in particolare sulla figura di Domenico Venier, tra i più rappresentativi interpreti della lirica petrarchesca nel contesto veneziano del XVI secolo. Attraverso un’analisi delle principali istanze tematiche e stilistiche rintracciabili nella sua produzione poetica, la tesi intende delineare un profilo letterario dell’autore che tenga conto non solo della tradizione petrarchesca, ma anche delle caratteristiche culturali e sociali del contesto lagunare. Particolare attenzione è riservata al cenacolo venieriano, luogo privilegiato di scambio intellettuale e di sperimentazione poetica, che svolse un ruolo significativo nella diffusione e nella rielaborazione del canone lirico stabilito da Pietro Bembo nella prima metà del Cinquecento. La tesi prende inoltre in esame la ricezione critica della poesia di Venier, con l’obiettivo di ricostruire le diverse prospettive interpretative che hanno contribuito a delineare l’immagine letteraria del poeta nel corso dei secoli.This thesis aims to investigate the phenomenon of sixteenth-century Petrarchism in the Veneto region of Northern Italy, with a particular focus on the figure of Domenico Venier, one of the most prominent exponents of Petrarchan lyric poetry of the time. Through an analysis of the main thematic and stylistic features that characterize his poetic production, the study seeks to outline a literary profile of the author, considering not only the Petrarchan tradition but also the cultural and social characteristics of the Venetian context. Special attention is given to Venier’s social circle, a privileged space for intellectual exchange and poetic experimentation, which played a significant role in the dissemination and reworking of the lyric canon established by Pietro Bembo in the first half of the sixteenth century. The thesis also examines the critical reception of Venier’s poetry, aiming to reconstruct the various interpretative perspectives that have contributed to shaping the poet’s literary image throughout the centuries
Domenico Gerosolimitano a Venezia
No full textIn this article, the author provides the Hebrew name of Domenico Gerosolimitano, a famous ecclesiastical censor of Hebrew books who lived in Italy from the end of the sixteenth through the second decade of the seventeenth centuries. Based on the discovery of his baptismal act, recorded in Venice, Domenico Gerosolimitano's Hebrew name was Rabbi Samuel Vivas, of Jerusalem. The aforementioned act determines the exact date of his conversion to Catholicism, as 6 August, 1593. The author presents new information concerning Domenico´s life in Venice as well as his activities as censor of Hebrew books.El artículo se ocupa de la identificación hebrea de Domenico Gerosolimitano, célebre censor de libros hebreos que trabajó en Italia entre fines del siglo XVI y los primeros veinte años del XVII. Gracias a haber descubierto en Venecia el acta de bautismo, el autor ha logrado identificar a Domenico Gerosolimitano con el rabino Samuel Vivas de Jerusalén y precisar la fecha exacta de su conversión al catolicismo (6 de agosto de 1593). El estudio arroja además nueva luz sobre la estancia en Venecia de Domenico y sobre sus inicios como censor de libros hebreos
Sciascia ultimo (e postumo): "Fuoco all’anima"
No full textThis essay – presented at the XI Leonardo Sciascia Colloquium «Sciascia primo, ultimo e postumo» which took place online on the 19th and 20th of
November 2020 – reconstructs the genesis of a project to create a collection of dialogues, conceptualised by Domenico Porzio in collaboration with
Leonardo Sciascia. The resulting volume, Fuoco all’anima, appeared in 1992 and was doubly posthumous and doubly unfinished. This essay seeks to
reconstruct the hypothetical profile of a book which remained only virtual, drawing on unpublished documentation from the journalist’s archive,
currently housed at the Fondazione Arnoldo e Alberto Mondadori in Milan, and on some of his articles which make direct reference to the project
L'atto complesso di Umberto Borsi e il coordinamento procedimentale: ovvero il nome e la cosa
No full textNascita della teoria dell'atto complesso come prima messa a fuoco del procedimento amministrativ
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