Search results for " POSS"

showing 10 items of 148 documents

On the role of multi-functional polyhedral oligomeric silsesquioxane in polystyrene-zinc oxide nanocomposites

2014

Abstract Multi-functional trisilanol phenyl (TSPH) and trisilanol isobutyl (TSIB) polyhedral oligomeric silsesquioxane (POSS) have been used in the formulation of advanced polystyrene (PS)-zinc oxide (ZnO) nanocomposites. The neat matrix and PS/ZnO-based nanocomposites have been characterized through rheological, morphological, mechanical, and dynamic thermo-mechanical analysis. Both TSPH and TSIB are able to improve the dispersion of ZnO into the polystyrene matrix; furthermore, adding TSIB leads to better results because it facilitates better solubility into the PS matrix and interaction/reaction with the ZnO nanopowder. Finally, the optical properties and photo-oxidative resistance of th…

NanocompositeMaterials sciencePolymers and PlasticsnanocompositeGeneral Chemical Engineeringdispersant agentMetals and Alloyschemistry.chemical_elementZincSilsesquioxanechemistry.chemical_compounddispersant agent; nanocomposites; photo-oxidative resistance; POSS; UV shielding; Chemical Engineering (all); Polymers and Plastics; Materials Chemistry; 2506; Metals and AlloysUV shieldingchemistryphoto-oxidative resistancePolymer chemistrynanocompositesMaterials ChemistryChemical Engineering (all)Polystyrene2506POSS
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Nanocompositi a base polimerica e molecole POSS: comportamento reologico e proprietà fisiche

2012

Nanocomposites based on PS, PE, or ethylene-acrylic acid (ESCOR 5001) and POSS (Polyhedral oligomeric SilseSquioxanes) molecules were prepared by melt mixing. The nanocomposites’s structure-property relationships were analyzed mainly by rheological investigations and the variations with respect to the matrices were highlighted. The results of the rheological analysis show that the POSS molecules affect the properties in the molten state and act as plasticizer that is contrasted by the hydrogen bonds. The inorganic cage’s structure and the organic nature of the vertex groups of the molecules POSS play an important role in modulating the dispersion and in determining the final properties of t…

Nanocomposites POSS molecules rheological behavior plasticizer antiplasticizer.
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Viaggi nell’immaginario: il turismo virtuale nel sito UNESCO di Tarragona

2023

Le nuove tecnologie hanno trasformato in modo radicale non solo la geografia come disciplina, ma anche le geografie del mondo. Il digitale ha assunto, infatti, un ruolo di mediazione sempre più pervasivo nella produzione dello spazio, come delle conoscenze e degli immaginari geografici. Le possibilità offerte dal virtuale, in particolare, offrono oggi un contributo decisivo nella comunicazione dei significati attribuiti ai luoghi e rispondono in modo sempre più efficace ai bisogni emergenti del settore turistico. Le esperienze di visita mediate dal digitale mirano a coinvolgere i sensi e risultano efficaci quando promuovono immersioni rigorosamente realistiche. Nel quadro di queste riflessi…

New technologies have radically transformed not only geography as a discipline but also the geographies of the world. Indeed the digital has assumed an increasingly pervasive mediating role in the production of space as of geographic knowledge and imaginaries. The possibilities offered by the virtual in particular now offer a decisive contribution in communicating the meanings attributed to places and respond increasingly effectively to the emerging needs of the tourism sector. Digitally mediated visitor experiences aim to engage the senses and are effective when they promote rigorously realistic immersions. Within the framework of these reflections the paper highlights the renewed relevance of authenticity both of the tourism experience and of cultural heritage in relation to its potential for attraction and proposes a contextualization of the theme in light of the unprecedented opportunities granted by technologies for the creation of virtual and augmented spaces. The proposed discussion is therefore also a journey aimed at exploring authenticity as a tool through which new technologies can effectively mediate a sense of place and foster brand communication of a destination. The case study is the UNESCO site of Tarragona whose most relevant image for urban policies is presented. This shared figuration spatially defined and rooted in a precise historical moment is reconstructed on the one hand through the analysis of functional documentation for the candidacy and on the other by means of a review of mobile applications developed for the promotion of the city's cultural heritage. The proposed journey and exploration of the place return in light of the research data and in conclusion the central role played by digital technologies in mediating the UNESCO imaginary. The forms of virtual tourism in Tarragona confirm that to travel is to experience a text enveloped in time and inscribed in space.Settore M-GGR/01 - Geografia
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Cultural institutions as agents of urban and community regeneration in the (post-)pandemic city. The case of the «Laboratorio Zen Insieme» in Palermo

2022

Although all cities in the world have been affected by the COVID-19 pandemic, its impacts on the territories, yet to be understood, are unevenly distributed, revealing extremely varied imbalances depending on the places. However, it is clear that the virus and its variants have aggravated pre-existing socio-spatial inequalities, creating new ones and bringing attention back to those implications between space, planning, public health and citizenship that are at the origins of contemporary urbanism. In a reference framework in which the crisis is globalized but unequal and in the absence of a welfare system capable of responding to the urgencies of the most marginalized social contexts and g…

Olsen 2018Settore ICAR/21 - UrbanisticaSettore M-GGR/01 - GeografiaSacco and Blessi 2009). In the current (post-) pandemic context and through the lens of a southern European perspective the purpose of this article is to critically reflect about the role of culture as possible vehicle of urban and community regeneration. In particular we will focus on the activities of the no profit organization «Laboratorio Zen Insieme» in ZEN2 one of the last large popular and peripheral neighborhoods built in Palermo at the end of 80s in order to explore and understand how cultural practices work as agent of urban and social transformation capable of addressing emerging issues especially in the pandemic scenario we are experiencing. Thecasestudy has been conducted through analysis of documents participative observations (Honer and Hitzler 2015) and qualitative in-depth interviews with key actors involved in the conception organization and management of the activities carried out by Laboratorio Zen Insieme with representatives of local institutions and non-formal conversations with participants of the workshops heldin the neighborhood. The experience we narrate finds that cultural practices have re-conceptualized their design and functions as strategies of urban and community regeneration and at the same time have contributed to answer to emergent issues in developing proximity and local based strategies facing up to problems inherent civil rights educationalpoverty socio-spatial justice and have changed the image and identity of urban places they inhabit.In this sense the research provides a framework for development of strategies and legitimization for cultural practices and a point of discussionabouttheirrolein urban development.Although all cities in the world have been affected by the COVID-19 pandemic its impacts on the territories yet to be understood are unevenly distributed revealing extremely varied imbalances depending on the places. However it is clear that the virus and its variants have aggravated pre-existing socio-spatial inequalities creating new ones and bringing attention back to those implications between space planning public health and citizenship that are at the origins of contemporary urbanism. In a reference framework in which the crisis is globalized but unequal and in the absence of a welfare system capable of responding to the urgencies of the most marginalized social contexts and groups a response to the new social and individual needs has been offered by cultural institutions that play a role of territorial agency often independently or in the absence of political institutions. Far from the idea of entertainment and divertissement it is in fact increasingly clear how the practices of cultural innovation experimenting with various forms of action and participation can in some cases play a fundamental role in the processes of social cohesion and community building representing an antidote to the worsening of the phenomena of marginalization and socio-spatial inequalities within cities and territories (Colantonio and Dixon 2011
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Incompiute città di Palermo

2019

Con l’ultimo numero 23-24, interamente dedicato alla città di Palermo, la rivista “Architettura Civile” pone al centro dell’attenzione la questione della città contemporanea e delle sue molteplici declinazioni architettoniche, con un atteggiamento che, non senza disincanto, riconsidera lo studio e la riflessione sulla città e sulle sue condizioni attuali come fondamento del progetto di architettura. In questo caso Palermo, “città mitica e mitizzata” e al contempo “stereotipo di processi di incontrollata urbanizzazione” rappresenta un caso esemplare; nel tema delle Incompiute idee di città possibili si rende infatti riconoscibile il paradigma connotativo dello stesso divenire di Palermo, lun…

Palermo città incompiute progetto architettura ontogenesi e filogenesi della cittàSettore ICAR/15 - Architettura Del PaesaggioSettore ICAR/14 - Composizione Architettonica E UrbanaPalermo unfinished ideas of possible cities architecture ontogenesis and phylogenesis of the city
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Ficta versus possibilia

1994

PhilosophyAnalytic philosophyPhilosophyfictional objectspossible objectsEpistemologyfictional objects; possible objects
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UNESCO’s cinematic multiverse and the best of all possible worlds

2020

PhilosophyBest of all possible worldsitämaatkulttuurisuhteetkulttuuripolitiikkakansainväliset suhteetlänsimaatdiplomatiaelokuvatpolitics of differenceEpistemologyglobal governanceintertextualitykansainväliset järjestötMultiverse (religion)cinemarauhanaatecultural diplomacyLektiotUnescoeast and west
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Se l’enunciatore non parla. Note sulla nozione ducrotiana di punto di vista.

2018

«Voice» and «Point of view» have been two of the most debated topics in some fields of linguistics and semiotics. Generally, DUCROT (1984) is considered like one of the first essays which introduced these concepts in the theoretical framework of the analysis of enunciation. As for the first one, the Author limits himself to suggest that it is connected with the notion of «discourse». In fact, by examining some topics of SPERBER & WILSON (1978), he seems to assimilate «voice» to «discourse». Indeed, you can read «j’ai substitué l’expression “faire entendre une voix” à leur expression “mentionner un discours”». As for the second concept, He seems to assimilate «point of view» to intuitive not…

Point of view Enunciator propositional content virtual discourse possible representation
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Presa de possessió del Consell de Direcció Universitària

2006

Presa de possessió del Consell de Direcció Universitària.

Pressa Possessió Consell de direcció Universitària Jardí Botànic
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Le due vie della prova ontologica. Dal possibile all'esistente e dall'esistente al possibile

2015

Ontological proof can still claim a meaning for itself as a privileged locus of religious experience that thought has to the extent that it makes itself able to open up to something that, for its part, cannot be contained in the scope of the simply thinkable. This article will discuss, also in a dialogue with the positions of some authors, the possibility of this religious experience that spans thought and which thought itself is able to account for, no longer with the means of a purely demonstrative procedure, but going right to the bottom of those conflicts and internal lacerations that make it, so to speak, permeable to faith. This makes it possible, at one and the same time, to find in …

Prova Ontologica Esistente PossibileSettore M-FIL/01 - Filosofia Teoretica
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