4,119 research outputs found
Le «buone letture». 2. Giovanni Casati
No full textIl saggio è costituito da due parti, la prima delle quali, dedicata alla fondazione della Federazione italiana delle biblioteche circolanti cattoliche, è stata pubblicata nel precedente numero dei «Nuovi Annali», XXVII (2013), pp. 137-163. In questa seconda parte viene delineata la figura intellettuale di Giovanni Casati, che diresse la «Rivista di letture» dal 1912 al 1944, trasformando il periodico della Federazione in una rivista impegnata nella divulgazione della cultura cattolica. A questo impegno militante Casati fece corrispondere un intenso programma editoriale, che trovò espressione nella pubblicazione di saggi letterari, di manuali e opere repertoriali.The study consists of two parts; the first is dedicated to the history of the Federazione italiana delle biblioteche circolanti cattoliche since its foundation (1904) up to 1912 and was published in the previous volume of the «Nuovi Annali », XXVII (2013), pp. 137-163. In this second part, the author outlines the intellectual figure of Giovanni Casati, who directed the «Rivista di letture» from 1912 to 1944, transforming the magazine of the Federation in a journal engaged in the spreading of Catholic culture. To this militant engagement Casati matched an intense publishing program, which found its expression in the publication of literary essays, manuals and reference works
Comico e tragico del diritto nella novellistica italiana: il novelliere di Giovanni Sercambi
No full textNelle novelle di età tardomedievale ed umanistica, a causa del loro carattere fortemente realistico, il diritto ha un posto importante, poiché rappresenta un elemento centrale e ineliminabile della vita della comunità. Il novelliere di Giovanni Sercambi da Lucca non fa eccezione, anche se l’autore non ha una cultura giuridica né s’interessa in modo specifico al diritto. Il presente saggio vuole analizzare sotto tale profilo queste novelle per verificare quale concezione del diritto emerge da esse e come la narrazione ne risulti arricchita.In the late medieval and humanistic novellas, owing to their very realistic character, the right is an important central and inevitable element in community life. Giovanni Sercambi’s novelliere is no exception even if the author lacks a legal culture, nor is specifically interested in right. This essay intends to analyze these novellas under this profile to verify what kind of right they consider and how the stories are enriched
Nanostructured lime-based materials for the conservation of calcareous substrates
Get PDFNanolimes, i.e. dispersions of lime (Ca(OH)2)nanoparticles in alcohol, have been extensively investigated over the last two decades as consolidation products for calcareous substrates.
The use of nanolimes for consolidation of mural paintings arises from the lack of effective and compatible consolidants for this type of substrates; the use of nanolimes was later extended also to limestone and lime-based mortars, as an alternative for silica-precursor consolidants (e.g. tetraethoxysilan - TEOS), which had shown to have a limited effectiveness and compatibility with calcareous substrates.
Nanolime dispersions are characterized by a very small size of the lime particles, which should provide a proper penetration within the porous network of most building materials. In fact, a homogeneous and in-depth penetration of the consolidant is a crucial requirement when dealing with decayed stones and plasters/renders.
The effectiveness of nanolime dispersions reported in literature appears controversial. Some authors observed a proper penetration and moderate consolidating action, whereas others report poor penetration, poor consolidation action and sometimes the formation of a white haze on the treated surface. There is no agreement concerning the factors affecting the transport and deposition of the lime nanoparticles within a porous network, and the causes of the observed drawbacks are not well understood.
Therefore, the main research question is:
Is nanolime a suitable alternative to silica-precursor consolidants (e.g. TEOS) for the consolidation of calcareous substrates?
More specifically, the following research questions can be formulated:
– How and up to which extent can the effectiveness and compatibility of nanolime be improved? How can deposition of nanolime in depth be improved and the appearance of a white haze on the surface avoided?
– How can nanolime properties be fine-tuned to improve the effectiveness and compatibility of the treatment?
– What is the effect of different application methods on the effectiveness of nanolime consolidation?
This research investigates and elucidates the behaviour of nanolime products for consolidation of calcareous substrates. Based on the developed knowledge, it proposes and validates a methodology (including solvent modification and application protocol) for improving the consolidation effectiveness of nanolime dispersions, making these a suitable alternative for TEOS products.
Firstly, an experimental campaign was carried out in order to understand the penetration and deposition of commercial nanolimes on coarse porous calcareous substrates (Maastricht limestone). The main cause of the poor nanolime deposition in-depth was identified in the back-transport of the nanoparticles towards the drying surface, as a consequence of the high volatility and low kinetic stability of the dispersions.
The modification of the nanolime properties, through the optimization of the solvent, appears thus a feasible strategy to improve the in-depth deposition of the lime nanoparticles. New nanolimes were synthetized and dispersed in a selection of solvents conferring different stability and drying rate to the obtained nanolime dispersions. A conceptual model, correlating the properties (i.e. drying rate and kinetic stability) of nanolimes dispersed in different solvents, to the moisture transport behaviour of the substrates to be treated, was conceived. The model was experimentally validated on coarse porous (Maastricht) and fine-porous (Migné) limestones.
Experimental results confirmed the predictions of the model that nanolimes dispersed in solvent with lower volatility and stability (e.g. water or butanol) have a good in-depth deposition within coarse porous networks. On the other hand, solvents with higher volatility and guaranteeing higher kinetic stability (e.g. ethanol or isopropanol) to the relative dispersions, should be preferred for substrates with fine porous networks. Fine-tuning the properties of the nanolime dispersion (by modification of the solvent) to the moisture transport behaviour of the substrate, is shown to be a successful strategy for improving in-depth deposition of lime nanoparticles.
On the basis of the obtained results, the solvent mixture was further fine-tuned using ethanol-water mixtures. Results proved that ethanol-based nanolime, mixed with a minor amount of water (5%), can provide better nanoparticles in-depth deposition within coarse porous substrates (e.g. Maastricht limestone), when compared to dispersions in pure ethanol.
The application procedure of nanolime dispersions was also studied and optimized, this step being a crucial aspect for a successful consolidation; nanolimes were applied both by capillary absorption (method commonly used for laboratory tests) or by nebulization (method widely used in situ) on a coarse porous limestone and a mortar.
The research showed that results obtained by application through capillary absorption do not always correspond to those obtained by nebulization.
The effectiveness and compatibility of nanolimes with improved properties and a fine-tuned application protocol were finally verified. Fresh and weathered Maastricht limestone, as well as lime-based mortars, were treated. Results showed that nanolime dispersions can guarantee an in-depth consolidation both in laboratory mortar specimens and weathered limestone, with only a moderate alteration of the total porosity and of the moisture transport properties of the investigated substrates.
Therefore, nanolime dispersions, provided that they are properly formulated and applied, can be a suitable and compatible alternative to TEOS for the consolidation of coarse porous substrates.
This dissertation contributes to define guidelines to support restorers and professionals in the choice and application of nanolime dispersions for consolidation of calcareous substrates
Bird presence vegetation complexity data in Melbourne, Australia. Data created in 2018 by Giovanni Carrabs.
No full textBird presence and vegetation complexity data from Melbourne, Australia. Data created for a university thesis project and publication in 2018. Author: Giovanni Carrabs.</p
Chapter Atto biografo di Giovanni Gualberto
No full textThe paper examines the Vita s. Iohannis Gualberti by Atto, reconstructing its genesis and fortune. Probably the author wrote this hagiography when he was abbot and before becoming bishop of Pistoia. He re-elaborated the Life of the saint by Andrea of Strumi, adapting it to a changed historical and ecclesiastical context. The text was successful among the Vallombrosan Order and it was used by later hagiographers to create epitomes and rewritings of the Life of Giovanni Gualberto
Author of newly released Bicycles, Nikki Giovanni gives tips on writing a love poem
No full textA new book of love poetry has been published by internationally known author Nikki Giovanni, University Distinguished Professor of English at Virginia Tech
Due paliotti ricamati da Giovanni Rassanelli alias Fiorentino per la Cappella del Crocifisso nella Cattedrale di Palermo
No full textGrazie a due documenti pubblicati in questo articolo, l'autore attribuisce due paliotti d'altare conservati nel Tesoro della Cattedrale di Palermo, provenienti dai beni mobili della cappella del Crocifisso, a Giovanni Rassanelli detto "Fiorentino". Uno di essi viene identificato come quello ricamato con corallo, che fa parte dell'attuale esposizione del Tesoro.Thanks to two documents published in this article, the author ascribes two altar clothes stored
in the Treasure of Palermo’s Cathedral, coming from the movables concerning the chapel
of the Crucified, to Giovanni Rassanelli called "Florentine". One of them is identified as the one embroidered
with coral, which is part of the Treasure’s current exhibition
Frankenstein Rather Than Faust? The Decline of Limit-Surpassing Forces
Get PDFGiovanni Bottiroli’s article “Frankenstein Rather Than Faust?” aims to problematize and investigate further the challenge to the notion of «rigid identity» proposed by extant scholarship. In order to do so, Bottiroli dismantles a univocal understanding of «identity», bringing to light the polysemy and porosity intrinsic to this term. In order to do so, the author discusses here different modes of identity, concentrating on two in particular: coincidence and non-coincidence with oneself. Taking this distinction as his point of departure, Bottiroli applies these interpretative frameworks to two of the most significant figures of Western imagination, Frankenstein and Faust
Introducion
No full textThe paper is Introduction to: Music of the twenty-first century disporas: research and problems, edited by the author and Giovanni Giuriati. It contains a contribution to some nodal questions about music and migration studies, applied to the Italian situation. In particular: 1. Who are we talking about; 2. Ethnomusicology and migration studies; Music: from migrants to the new “us”. The themes touched by the articles of the book are particularly considered and presented
Entrevista a Giovanni Pesce
Get PDFL’autor ens presenta l’entrevista a Giovanni Pesce, antic vetear italià que participà a la Guerra d’Espanya amb les Brigades Internacionals.The author shows in this paper the interview with Giovanni Pesce, old italian veteran that fought in the Spanish Civil War as a member of the International Brigades
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