Search results for "tecnica"
showing 10 items of 2886 documents
A New Theoretical Approach on Teenage Cyclist-Vehicle Crash
2016
Data obtained in teenage cyclist impact against three vehicles (sedan, SUV and Pick Up), tested in previous works, are analyzed to verify the theoretical results by the coupling of momentum conservation principle and energy conservation principle. The speed of vehicle and thorax are compared with theoretical ones, obtaining an excellent agreement. Following the results found in the literature, particular emphasis is done on teenager cyclist thorax and head speeds, indicating that the cyclist speed can be theoretically until 1,41 times the impact speed, while greater values, until 2, are obtained in the simulations. A small slowing of the vehicle is found theoretically and in the simulations…
Passaggi aerei: suggestioni per un progetto
2011
The paper reports some suggestions useful for designing the small footbridge in the Archaeological Park named "Valle dei Templi" in Agrigento. The aim of the collection of different kinds of examples related to the design of bridges, footbridges and "aerial passageways" between buildings is to describe in which way -by using contemporary architectural "languages"- it is possible to solve the problem related to the necessity of climbing over an obstacle like a river, a street, a bunch of railways and so on, without interrupting the continuity of the pedestrians passage. Different kind of structures and materials are shown by underlining their potentialities in order to solve the pro¬b¬lems r…
prefazione
2015
PRESENTAZIONE Giovanni Fatta Mi sono più volte domandato perché il nome delle acque sia spesso dedicato ai santi, sia di quelle che vanno sulla nostra tavola, che delle acque che la natura in varia forma ci offre. Stimolato da alcuni passi del libro di Tiziana Campisi ho approfondito il tema e mi sono reso conto del ruolo, che non esito a definire “mitologico”, che ha avuto l’acqua da tempo immemorabile in Sicilia ed in ogni altra parte. L’acqua sorgiva era reputata di per sé un misterioso prodigio, ancora più se naturalmente calda e quando le venivano riconosciute proprietà terapeutiche. L’acqua di fonte era comunque legata ad una divinità che la concedeva ed a cui si dedicava il sito, sia…
Risorse territoriali e sviluppo locale: potenzialità e limiti del modello distrettuale
2012
Il tema centrale di questo scritto è ragionare sui requisiti di territorialità che possono essere rintracciati nei sistemi ad economia diffusa, con particolare attenzione alle mutazioni intervenute con la transizione ad una fase “postindustriale” che molti sistemi economici maturi stanno affrontando da alcuni anni. Proprio l’avere assunto come riferimento la nozione di sistema locale ci mette a disposizione un apparato concettuale che, a nostro avviso, ben si presta a svelare alcuni degli equivoci terminologici (e, poi, anche operativi) comparsi di recente nella cultura dello sviluppo locale. Si proverà a affrontare la questione facendo ricorso al concetto di “esternalità”, un termine che h…
The thermal performances of historic masonry: In-situ measurements of thermal conductance on calcarenite stone walls in Palermo
2018
Abstract Rich literature explores materials and construction techniques of historic buildings, but limited information is available about the thermal and hygrometric features of their envelope. Nevertheless, accurate hygrothermal data are essential for identifying effective energy upgrade measures, which must be compatible with the conservation of the architectural heritage. In order to fill this gap, it is necessary to refer to local contexts, where the variety of historic buildings is limited and their material and construction features are comparable. This paper focuses on historic masonry walls and discusses the results of twenty in-situ measurements of thermal conductance, performed al…
The Recurrent Characteristics of Historic Buildings as a Support to Improve their Energy Performances: The Case Study of Palermo
2017
Abstract The analysis of the recurrent characteristics of the local historic architecture is useful to develop large-scale energy analyses, regulations and financial strategies, but also to support technical guidelines for an energy improvement balanced with conservation. For this purpose, a multi-scale methodology ranging from envelope components to the urban dimension is necessary. In the research here exposed, this approach is investigated by focusing on the historic architecture of Palermo. For this heritage, the collection of thermal and hygrometric data for envelope components is combined with the examination of representative constructions, based on building stock categorization. Int…
The transformation of a building of the 1970s into a contemporary sustainable building in the Mediterranean Basin
2008
The paper shows the design strategies adopted by a group of graduands of the Faculty of Building Engineering at the University of Palermo involved in a research project aimed to analyse the problems related to the renovation of modern buildings and to solve them by using sustainable approach. In particular, the aim of the research is to investigate these problems in the context of the Mediterranean Basin by adopting, when possible, design criteria inherited by the traditional architecture where sustainable design strategies were used unconsciously. The graduands thesis consists in the transformation of Mazara City Hall into the new "Satiro Danzante Museum" by using natural ventilation syste…
Novel green bio-composite geopolymeric thermo-plasters for innovative building applications: upcycling spent coffee ground
2022
This study proposes the reuse of spent coffee ground and biomass fly ash in the development of green geopolymeric thermo-plastering for innovative building applications. The former waste is the major residue of the brewing process, that is usually used as fertilisers or disposed of in landfill with extreme harmfulness for the natural environment. The latter is an industrial waste generated during the Kraft paper-pulp process, that is usually landfilled. The mortar is produced with a combination of metakaolin (30 wt.%) and biomass fly ash (70 wt.%), and natural siliceous sand filled with spent coffee ground (up to 17.5 wt.%). The high amount of reused waste makes the material an optimum cand…
Evaluation of web reinforcements in prestressed concrete box girders through shear-transverse bending domains
2020
In concrete box girders, the amount and distribution of reinforcements in the webs have to be estimated considering the local effects due to eccentric external loads and cross-sectional distortion and not only the global effect due to the resultant forces of a longitudinal analysis: shear, torsion and bending. This work presents an analytical model that allows designers to take into account the interaction of all these effects, global and local, for the determination of the reinforcements. The model is based on the theory of stress fields and it has been compared to a 3D finite element analysis, in order to validate the interaction domains. The results show how the proposed analytical mode…