Search results for "Materiali"

INDAGINI DIAGNOSTICHE PROPEDEUTICHE AL RESTAURO DELLA SALA DEI VENTI DI PALAZZO DEI NORMANNI A PALERMO

2019

La Sala dei Venti è uno dei più suggestivi luoghi del Palazzo dei Normanni a Palermo, si tratta di una struttura sita all’interno della Gioaria, una torre medievale dell’originale nucleo arabo-normanno, antistante la Sala di Ruggero, coperta da un soffitto ligneo dipinto, risalente al XVIII secolo, al centro del quale campeggia una rosa dei Venti che dà il nome all’ambiente. Le porzioni superiori delle pareti e la copertura, soggette nel tempo a numerosi restauri e rifacimenti, presentano una ricca decorazione dipinta suddivisa in tre livelli: quello superiore costituito dal soffitto dipinto (parzialmente incamottato); quello intermedio costituito dai dipinti murali con decorazioni a finto …

Stabilizzazione

2010

Control of biofilm formation by poly-ethylene-co-vinyl acetate films incorporating nisin.

2010

The aim of this study was to evaluate the effect of poly-ethylene-co-vinyl acetate (EVA) films incorporating different concentrations (0.1%, 0.5% and 1%) of nisin on the biofilm-forming ability of Listeria monocytogenes ATCC 7644, Staphylococcus aureus 815 and Staphylococ-cus epidermidis ATCC 35984. Nisin was incorporated into two grades of EVA (EVA14 and EVA28) in the melt during a common film-blowing operation. The efficacy of EVA/nisin films was evaluated by biofilm biomass measurements and Live/Dead staining in combination with fluorescence microscopy. In order to evaluate whether the nisin incorporation could modify the film surface properties, contact angle measurements and scanning e…

A sustainable replacement for TiO2 in photocatalyst construction materials: Hydroxyapatite-based photocatalytic additives, made from the valorisation…

2018

The use of waste materials and by-products in building materials is of increasing importance to improve sustainability in construction, as is the incorporation of photocatalytic materials to both combat atmospheric pollution and protect the structures and façades. This work reports the innovative use of photocatalytic hydroxyapatite (HAp) based powders, derived from Atlantic codfish bone wastes, as an additive to natural hydraulic lime mortars. HAp is the main component of bone, and hence is non-toxic and biocompatible. This is the first time that such a calcium phosphate-based photocatalyst, or indeed any fish/marine derived wastes, have been added to building materials. A key factor is th…

Torre tecnologica e percorsi dell’acqua: un possibile sistema di fruizione

2020

L'articolo presenta i risultati di un esercizio laboratoriale condotto con gli studenti del Corso di Laurea magistrale LM4 in Ingegneria edile - Architettura. L’idea parte dalla reinterpretazione delle torri piezometriche, utilizzate per mettere in pressione l’acqua proveniente dai canali sotterranei che irrorano la Conca d'Oro di Palermo e la Fossa della Garofala. L’originaria torre tronco piramidale a base quadrata è stata opportunamente modificata nella forma e nella funzione, svuotata all’interno in modo da consentirvi l'accesso. Chi entra potrà sostare, godere dell’ombreggiamento e della frescura prodotta da un sistema di raffrescamento evaporativo collocato nella parte sommitale della…

Human Soul, Body and Life Horizons

2013

Phenomenology of life develops an essential transformation of the positioning of life, human being, soul and life horizons. Human soul reflects the passions of the earth and of the skies. There are two directions characteristic for the soul – upward and downward. Life horizons are closely connected with life forms, styles of living. It has been described in rather different cultures including post-modern culture. This paper deals with A.-T. Tymieniecka’s ideas about the New Enlightenment and critique of too narrow an explanation of human subjectivity and body and discusses the need for balance between soul’s directions and decreasing of materialistic, consumerism life form, orientations to …

FORMULATION OF LIME MORTARS BASED ON NATURAL FIBERS AND WASTE MATERIALS FOR MORE SUSTAINABLE BUILDINGS

2019

Nowadays sustainability is one of the main concept in building construction, both considering energy saving buildings and life cycle assessment of building materials. According to these considerations, in this work the use of recycled and waste materials to produce a binder and the use of a natural fiber as reinforcement are investigated to obtain a sustainable mortar. Particularly, lime is obtained by kilning waste marble slurry from marbles quarries in western Sicily; pozzolanic aggregate is obtained by grinding glass powder from urban waste collection; natural fibers come from a widespread grass: Ampelodesmos Mauritanicus also known as diss. Scanning electron microscopy and helium picnom…

What Was Synthetic Biology?

2014

The desire to make life is not new. Mythology and history provide numerous examples of this Promethean longing. Materialist and evolutionist scientists over a century ago were convinced of the possibility and even the need to synthesize living beings to advance the knowledge on the nature and origin of life. The premature synthetic biology attempts by Stephane Leduc and Alfonso L. Herrera reflected the mechanistic ideal in biology of Jacques Loeb. The book “La biologie synthetique” by Leduc (1912) clearly defines the efforts of these pioneers: “Why is it less acceptable to seek how to make a cell than how to make a molecule?” Journalists have presented many advances in biology in the past c…

Film blowing of silane-modified polyethylene

2009

The grafting of vinyltriethoxysilane (VTES) onto polyethylene (PE) with the help of small amounts of peroxides was investigated to film-blow these modified materials. The degree of crosslinking was kept very low to achieve good melt processability and improved mechanical properties. The possibility of obtaining modified PE films with improved properties and regularly distributed crosslinking with a single processing step demonstrates the uniqueness of this study. The additive concentration was established through preliminary studies; with a batch mixer, it was possible to process the modified PE in the film-blowing operation. Water treatment of the modified films after film blowing allowed …

Slow Pyrolysis as a Method for Biochar Production from Carob Waste: Process Investigation and Products’ Characterization

2021

The zero-waste city challenge of the modern society is inevitably addressed to the development of model’s waste-to-energy. In this work, carob waste, largely used in the agro-industrial sector for sugar extraction or locust beangum (LBG) production, is considered as feedstock for the slow pyrolysis process. According to the Food and Agriculture Organization of the United Nations (FAO), in 2012, the world production of carobs was ca. 160,000 tons, mainly concentrated in the Mediterranean area (Spain, Italy, Morocco, Portugal, and Greece). To evaluate the biomass composition, at first, the carob waste was subjected to thermo-gravimetric analysis. The high content of fixed carbon suggest…