Search results for "tecnica"
showing 10 items of 2886 documents
Ricerca sul risparmio energetico in alcuni pastifici siciliani e studio delle possibilità di realizzazione di impianti di trigenerazione alimentati c…
2005
A procedure to evaluate the indoor global quality by a sub objective-objective procedure
2013
This paper proposes two complementary procedures for assessing the indoor global comfort: the first one, prevalently objective, is based on the acquisition of microclimate measured data and computed subjective values; the second one, that is purely subjective, uses a questionnaire drawn from the ISO/DP 10551 Recommendation. An application to some lecture-halls is here showed
Variabilità dell’olio essenziale di finocchio (Foeniculum vulgare Mill.) per effetto di trattamenti agronomici
2009
Il Finocchio da seme (Foeniculum vulgare Mill.), è una specie erbacea annuale o biennale della famiglia delle Apiaceae (ex Ombrellifere), spontanea e largamente diffusa all’interno del bacino del mediterraneo, di cui si utilizzano i frutti (comunemente detti “semi”) come aromatizzanti in numerosi preparati tradizionali e come base per la preparazione di diversi composti di interesse farmaceutico ed alimentare. Il presente lavoro illustra i risultati ottenuti a seguito di un’indagine sulla composizione dell’olio essenziale di finocchio, eseguita utilizzando materiale proveniente da un triennio (2004-2006) di prove agronomiche di controllo delle infestanti svolte in ambiente mediterraneo (Cam…
Managing Municipal Solid Waste: Energetic and Environmetal Comparison among different options
2001
Goal. This research aims to assess the environmental effects of integrated strategies in a municipal waste management system. In particular, analysis is focused on a waste stream in Palermo, where landfill involves the prompt disposal of the most waste after collection. The current local management system is compared with two integrated waste management alternatives. Both the options comply with Italian regulations, but each one predicts adopting the available technologies in different ways. Methods and objectives. Energetic and environmental balances are carried out in each management system referring to local waste composition in order to quantify energy consumption, the recovery of mater…
Come ascoltare i figli e come farsi ascolatre
2010
In questo breve saggio, sono delineate alcune caratteristiche che la comunicazione reale tra genitori e figli dovrebbe possedere, secondo il personale punto di vista pedagogico dell’autore. A ben vedere, per realizzare questo compito, bisogna prima interpellare i genitori su quello che già sanno sul tema a motivo della loro quotidiana esperienza educativa vissuta a contatto con i loro figli preadolescenti (11-14 anni) e adolescenti (15-19 anni). Per questo, innanzitutto si riferiscono alcune idee sul tema in questione espresse nel contesto dei focus group dai genitori che hanno partecipato agli incontri pedagogici fatti in alcune scuole secondarie di primo e di secondo grado della nostra re…
Development of Neural Network Prediction Models for the Energy Producibility of a Parabolic Dish: A Comparison with the Analytical Approach
2022
Solar energy is one of the most widely exploited renewable/sustainable resources for electricity generation, with photovoltaic and concentrating solar power technologies at the forefront of research. This study focuses on the development of a neural network prediction model aimed at assessing the energy producibility of dish–Stirling systems, testing the methodology and offering a useful tool to support the design and sizing phases of the system at different installation sites. Employing the open-source platform TensorFlow, two different classes of feedforward neural networks were developed and validated (multilayer perceptron and radial basis function). The absolute novelty of this approac…
Energy and Environmental Assessment of a Hybrid Dish-Stirling Concentrating Solar Power Plant
2022
Although the 2019 global pandemic slowed the growing trend of CO2 concentrations in the atmosphere, it has since resumed its rise, prompting world leaders to accelerate the generation of electricity from renewable sources. The study presented in this paper is focused on the evaluation of the energy and environmental benefits corresponding to the hypothesis of hybridizing a dish-Stirling plant installed on the university campus of Palermo (Italy). These analyses were carried out by means of dynamic simulations based on an accurate energy model validated with the experimental data collected during the measurement campaign that occurred during the period of operation of the reference plant. As…
SHEAR RESISTANCE OF R/C BEAMS PROVIDED WITH DIFFERENTLY-INCLINED TRANSVERSE REINFORCEMENT
2012
The model for the evaluation of shear resistance of reinforced concrete member provided with transverse web reinforcement, derived by Nielsen (1999) on the basis of the variable inclination stress field approach, is generalized here to predict the shear strength of r.c. beams equipped with two sets of differently-inclined transversal web reinforcement and longitudinal skin reinforcement. Numerical analyses emphasize the efficiency of double inclined web transverse reinforcement in providing shear strength to beams.
Aggregati artificiali dal riciclaggio di imballaggi PET
2016
In questo contributo si espongono le caratteristiche fisiche, le prestazioni meccaniche e il processo produttivo di aggregati leggeri di polietilentereftalto denominati alPET, ricavati principalmente dal riciclaggio di imballaggi per bevande. Attraverso l'analisi delle loro proprietà, si evidenzia la possibilità d'impiegare questi aggregati per la produzione di conglomerati bituminosi e cementizi destinati a componenti strutturali portanti dei viadotti stradali.
Construction stages of cable-stayed bridges with composite deck
2012
A cable-stayed bridge is built by following a construction sequence of different subsequent stages that imply changes of the geometric configuration, restraints and consequently stress and strain patterns. A study is presented about stay stressing sequences in cable-stayed bridges with composite deck for the case of construction made by the cantilever method. Initial cable forces are found through partial elastic schemes of construction stages. Different stay stressing procedures are implemented and a comparison between them is proposed in order to evaluate the differences in terms of deformed shape and internal force distribution of the deck and the pylon. Results can be useful to give pra…