4,059 research outputs found
The Classics of the First Lorenzo de' Medici. For a New Critical Reading of Corinth
No full textopenIl presente lavoro si propone di rileggere una delle prime opere di Lorenzo de’ Medici, "Corinto", attraverso temi letterari che lo caratterizzano, tenendo presente i modelli latini, greci e italiani ai quali l’autore attinge e confrontandone altri, pertinenti ai temi analizzati. Dopo una rapida introduzione sul contesto storico in cui il poemetto si inserisce, esso viene presentato per quanto concerne il contenuto e la storia redazionale, approfondita nell’Appendice, dove si presentano inoltre i testi di riferimento. Segue dunque la nuova lettura critica. La riflessione sul concetto di classico e su Lorenzo quale autore e personaggio del poemetto conclude l’analisi.The present work aims to re-read one of Lorenzo de’ Medici’s first works, "Corinto", through the literary themes which characterize it, keeping in mind the Latin, Greek and Italian models on which the author draws and comparing others, pertinent to the themes analyzed. After a quick introduction to the historical context in which the poem fits, it is presented in terms of content and editorial history, detailed in the Appendix, where the reference texts are also presented. Thus follows the new critical reading. The reflection on the concept of classic and on Lorenzo as author and character of the poem concludes the analysis
Nano-engineered brick surfaces for biofouling prevention: experimental results and analytical modelling
No full textLe facciate degli edifici sono inevitabilmente soggette al deterioramento causato dalla colonizzazione di microorganismi quali batteri, alghe, cianobatteri, funghi, licheni, etc.
Oltre ai tradizionali metodi manutentivi, si stanno sviluppando rivestimenti innovativi con caratteristiche sfavorevoli allo sviluppo di macchie biologiche.
In questa direzione, si sta sviluppando l’applicazione di nanotecnologie, in particolare nano-rivestimenti fotocatalitici. Il materiale più diffuso in questo settore è il biossido di titanio (TiO2) grazie alla sua non-tossicità, stabilità foto-chimica e basso costo.
La ricerca ha l’obiettivo di studiare l’efficienza del TiO2 contro la bio-incrostazione algale su superfici in laterizio. La ricerca si concentra sull’abilità del TiO2 di limitare l’adesione delle cellule algali sotto l’azione dei raggi UV e in condizioni di luce visibile. Inoltre, vengono analizzate le relazioni tra il substrato e l’efficienza fotocatalitica, principalmente la rugosità e la porosità.
L’attività sperimentale consiste nel sottoporre campioni di laterizio a cicli di bagnatura/asciugatura con una sospensione algale, in condizioni climatiche controllate. La bio-incostrazione è stata valutata nel tempo attraverso l’analisi digitale dell’immagine e misure colorimetriche.
I risultati hanno evidenziato che il TiO2 ha l’abilità di inibire l’attecchimento delle cellule algali e in alcuni casi è in grado di arrestare del tutto la crescita dei microorganismi. L’efficienza è strettamente legata alla porosità e alla rugosità del substrato. Infine, l’addizione di nano-particelle di Ag e Cu alla soluzione di TiO2 non ha evidenziato miglioramenti significativi.
La ricerca, partendo dai dati sperimentali, ha sviluppato un modello analitico basato sulla legge di Avrami. Il modello ha dimostrato un’ottima accuratezza nel riprodurre i risultati sperimentali e può essere potenzialmente applicato per la predizione del processo di bio-incrostazione su reali facciate in laterizio
Biofouling Prevention of Ancient Brick Surfaces by TiO2-Based Nano-Coatings
No full textBrick constitutes a significant part of the construction materials used in historic buildings around the world. This material was used in Architectural Heritage for structural scope, and even for building envelopes. Thus, components made of clay brick were subjected to weathering for a long time, and this causes their deterioration. One of the most important causes for deterioration is biodeterioration caused by algae and cyanobacteria. It compromises the aesthetical properties, and, at a later stage, the integrity of the elements. In fact, traditional products used for the remediation/prevention of biofouling do not ensure long-term protection, and they need re-application over time. The use of nanotechnology, especially the use of photocatalytic products for the prevention of organic contamination of building façades is increasing. In this study, TiO2-based photocatalytic nano-coatings were applied to ancient brick, and its efficiency towards biofouling was studied. A composed suspension of algae and cyanobacteria was sprinkled on the bricks’ surface for a duration of twelve weeks. Digital Image Analysis and colorimetric measurements were carried out to evaluate algal growth on specimens’ surfaces. Results show that photocatalytic nano-coating was able to inhibit biofouling on bricks’ surfaces. In addition, substrata (their porosity and roughness) clearly influences the adhesion of algal cells
Durability of self-cleaning TiO2 coatings on fired clay brick façades: Effects of UV exposure and wet & dry cycles
No full textEnvironmental pollution is constantly increasing and it causes aesthetical concerns to urban buildings
exposed to the atmosphere. Nanometric titanium dioxide (TiO2) has become a promising photocatalytic
material owing to its ability to accelerate degradation of many organic contaminants. Application of TiO2
is rising and it found application on building industry. However, photocatalytic properties of this
nanotechnology strongly depend on substrate morphology and on its nature. Thus, it is not correct to
extrapolate photocatalytic activity on different types of substrate. Moreover, very few information is
available about effectiveness of TiO2 coatings after aging phenomena when applied on different substrate.
This paper aims to investigate photocatalytic properties of TiO2 applied on clay brick surfaces both
after deposition and after aging process. TiO2 characterization was carried out by assessing nano-film
morphology, wettability and self-cleaning efficiency before durability test. Self-cleaning ability was
also evaluated during aging test in order to evaluate its variation in long term applications. Results show
that photocatalytic efficiency of TiO2 remain stable after aging, thus TiO2 shows a good photocatalytic
efficiency when it is applied to clay brick substrate. In the long run, photocatalytic efficiency of clay brick
specimens treated with TiO2 is seven times higher than untreated specimens
Breve, E Succinto Racconto Del Viaggio, solenne Entrate, & ossequiosi Vasallaggi ... dell'Augustissimo Imperatore Leopoldo ... Principato Nel Mese di Giugno, e finito d'Ottobre L'Anno 1660 ... / Per opera, e studio di Lorenzo De Churelichz Araldo di Sua Maestà Cesarea
No full textThe role of roughness and porosity on the self-cleaning and anti-biofouling efficiency of TiO2-Cu and TiO2-Ag nanocoatings applied on fired bricks
No full textFrom the advent of nanotechnologies in building constructions, many materials were functionalized to create composite material with new properties.
Titania (TiO2) is actually the most promising nanotechnology to create composite materials with self-cleaning and anti-microbial properties. TiO2 was able to limit algae adhesion and their growth, even if, in case of high porous and rough substrata, their inhibitory effect seems to be limited. This way, in this study, silver and copper nano-particulate enhanced an aqueous nano-titania solution were applied on brick specimens and their inhibitory effects were tested during accelerated laboratory tests.
Extent of biofouling on specimens’ surface was assessed by measuring the aesthetical alteration and correlations between algal growth and key parameters of substrata were discussed.
Results confirm the key role of porosity and roughness on the biofouling process on untreated specimens, and their effect on the photocatalytic power of the tested nano-coatings toward algal adhesion.
Results from this study were compared with previous findings in the literature on the same types of specimens only treated with the same aqueous nano-titania solution. No significant improvements were detected by the addition of metal nanoparticles.
Experimental curves were overlapped to analytical model calculated by Avrami’s law, and its validity was confirmed where latency time could be observed. Whereas no latency time was detected, that is a very fast adhesion of algal cells occurred, the experimental curves were modelled by using a four parametric logistic model that was able to describe numerically the biofouling process
Integrated photogrammetric survey and bim modelling for the protection of school heritage, applications on a case study
No full textThe contribution, considering the use of low-cost photogrammetric detection methodologies and the use of asset Historical-BIM, has as its aim the theme of knowledge and the adaptation of safety in school buildings, a topic brought to attention by the many situations of seismic risk that have interested the central Apennines in Italy. The specific investigation is referred to the Abruzzo region, hit by the recent earthquakes of 2016 and 2009 that have highlighted the vulnerability of the building structures involved in a large seismic crater covering large areas of the territory. The need to consider in advance the performance standards of building components, especially concerning the strategic ways of the functions contained in them, starts here. In this sense, the school buildings have emerged among the types on which to pay attention, a study theme to be promptly considered, considering the functions performed within them and the possible criticality of such constructions, often dated, enlarged or readjusted without appropriate seismic adaptation plans. From here derives the purpose of the research that is directed towards a systematic recognition of the scholastic heritage, deriving from objective and rapid surveys at low cost, taking into consideration the as-built and the different formal and structural aspects that define the architectural organisms to analyse and manage through three-dimensional models that can be interrogated using HBIM connected to databases containing information of a structural and functional nature. In summary, through the implementation of information in the BIM model, it will be possible to query and obtain in real time all the necessary information to optimize, in terms of efficiency, costs, and future maintenance operations. © Authors 2018. CC BY 4.0 License
Relationship between fracture toughness and porosity of clay brick panels used in ventilated façades: Initial investigation
No full textTiO2-treated different fired brick surfaces for biofouling prevention: Experimental and modelling results
No full textBiofouling on building façades, caused by the growth of bacteria, algae, cyanobacteria, fungi, lichens and plants leads to aesthetical degradation and to an increase in the maintenance costs consequently. Recently, the use of nanotechnology to prevent this phenomenon has been increased due to their efficiency and affordable cost. Currently, the research focuses on the numerical modelling of biofouling in order to simulate the biofouling processes and to find the correlations between physical properties of substrata and growth of microorganisms. In this paper, biofouling tests were conducted on fired brick substrata with different intrinsic characteristics (porosity and roughness) by means of an accelerated growth test. Biofouling was evaluated through time by digital image analysis of specimens׳ surface and then the Avrami׳s law was applied to modelize the biofouling process. The model was adapted to include the inhibitory effect of TiO2 and a modified equation of Avrami was proposed. Results show a good agreement between simulation and the experimental data. Furthermore, the assumptions taken into account to discretize the real phenomenon were acceptable. The experimental analysis and the numerical modelling showed how the roughness and the porosity influenced the algal attachment
GOLAM: A Framework for Analyzing Genomic Data
No full textThe emerging medical models aim at leveraging on high-throughput genome sequencing technologies to better target drugs to patients' personal profiles so as to increase their effectiveness. However, the huge amount of data made available by these technologies calls for sophisticated and automated analysis techniques. In this direction we present GOLAM, a framework for OLAP analysis and mining of matches between genomic regions extracted from ENCODE, a worldwide-available collection of shared genomic data. The goal of GOLAM is to overcome the current limitations of genome analysis methods, that are normally based on browsing. This is done by partially automating and speeding-up the analysis process on the one hand, by making it more flexible and introducing a multi-resolution view of data on the other. The framework has been partially implemented so far; in this paper we focus on conveying its potential and on describing its functional architecture and the underlying data models
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