Search results for "scienza"
showing 10 items of 1408 documents
A systematic literature review on less common natural fibres and their biocomposites
2018
Abstract Interest in utilization of renewable resources is increasing because of public's environmental awareness and economic considerations. Lignocellulosic fibres have already attracted growing attention as reinforcement of polymeric matrices instead of synthetic ones (mainly glass) from the academic and industrial fields. In addition to kenaf, hemp, sisal, flax and jute, which are the subject of extensive investigations for composite applications since the 1970s, in the last years several researchers suggested the use of less common natural fibres, due to their low cost and availability. This paper reviews the extraction methods, chemical, morphological, thermal and mechanical propertie…
Durability evaluations on the bridge over the Ruwais lagoon at Jeddah
2008
The bridge over the Ruwais Lagoon at Jeddah, Saudi Arabia, has been built in the first half of 80s within a large-scale program project concerning the "corniche", a seafront boulevard running more than 30 Km from its northern to its southern end.
Special Issue on “Frontier Biomechanical Challenges in Cardiovascular Physiopathology”
2017
This special issue collects a number of original contributions, which were presented and discussed during the thematic Symposium organized by the Italian Chapter of the European Society of Biomechanics (ESB) in collaboration with the Mediterranean Institute for Transplantation and Advanced Specialized Therapies (ISMETT – IRCCS), the Fondazione RiMED and the University of Palermo. The Symposium focused on recent advances in cardiovascular biomechanics, and the promise they hold for clinical therapeutic strategies and future research.
An extension of the fractional model for construction of asphalt binder master curve
2015
Knowledge and prediction of viscoelastic behaviour of asphalt binder is of great interest in order to design asphalt mixtures for civil construction of road and airports with good performances. The capability of a fractional model – requiring a very limited number of parameters – to describe and predict the linear viscoelastic behaviour of asphalt binder subjected to sinusoidal oscillations is investigated. Experimental data of complex modulus, |G*|, and phase angle, δ, are used to validate the proposed constitutive model. Based on the proposed extension of a fractional model, complex modulus isotherms for a range of frequencies can be created simply starting from isochronals at frequency v…
Backcalculation of airport pavement moduli and thickness using the Lévy Ant Colony Optimization Algorithm
2016
Interpretation of NDTdata is crucial in any Airport Pavement Management System (APMS), in order to implement strategies to maintain airport pavementssince they allow to estimate their remaining life and related maintenance needs and activities. In this paper, the AntColony Optimization algorithmwasused for backcalculation of pavement moduli from surface deflection data. The algorithm’s performances are illustrated and improvement in prediction quality is demonstrated both in terms of goodness of fitness and computational effort. Moreover, it is proved that the proposed algorithm is also able to predict layer thicknesses, taking into account their variation too.
End-of-life and waste management of disposable beverage cups.
2021
Different human activities have caused and currently cause catastrophic environmental phenomena, and unfortunately, a significant negative contribution to these catastrophic phenomena can be attributed to uncontrolled plastic production, use and release everywhere. On the other hand, the plastics offer numerous comforts and advantages, and for this reason, the modern life is unthinkable without plastic. Currently, numerous scientific papers and large audience advertisings, related to the production and use of polymers made by natural sources, i.e. bio-based polymers, as a valid alternative to the petroleum-based counterparts, have been published. Therefore, for production of daily disposabl…
Effect of surface finish on the mechanical behaviour of Dacron© 360 woven
2013
Abstract In the present paper some experimental analyses of Dacron© 360 woven with and without surface treatment are presented to evaluate the effect of this treatment on the constitutive behaviour. This woven, widely adopted in sail manufacturing, is obtained by weaving polyethylene terephthalate (PET) yarn and it shows some peculiar features due to the manufacturing process. The experimental tensile tests, clearly show the orthotropy behaviour of the material. The effect of the treatment results in a stiffer behaviour especially along the warp and bias direction and in an increment of ultimate strength in all directions.
Restraining approach for the spurious kinematic modes in hybrid equilibrium element
2013
The present paper proposes a rigorous approach for the elimination of spurious kinematic modes in hybrid equilibrium elements, for three well known mesh patches. The approach is based on the identification of the dependent equations in the set of inter-element and boundary equilibrium equations of the sides involved in the spurious kinematic mode. Then the kinematic variables related to the dependent equations are reciprocally constrained and, by application of master slave elimination method, the set of inter-element equilibrium equations is reduced to full rank. The elastic solutions produced by means of the proposed approach verify the homogeneous, the inter-element and the boundary equi…
Il metodo e la storia
2006
The present volume aims to examine the relationship between some models of articulation of the system of art theory and the methodological reflection on the history of aesthetics in 20th-cen- tury Germany. Starting from Erwin Panofsky, this volume analyz- es various aspects of the debate of the 1920s and 1930s (the de- velopment of neo-Kantian methodology, historical phenomenolo- gy, and the beginning of the “history of ideas”), up to the great crisis caused by the rise of Nazism. The author discusses Panofsky’s theoretical essays from 1915 to 1932 and his renowned book Idea; Baeumler’s works on aesthetic historiography and his revision of Panofsky’s historiographic mo- del; Rothacker’s con…
Omologia e analogia
2016
Il numero mira a comprendere la polarità omologia/analogia, e a esplorarne gli usi nei diversi ambi- ti in cui essa ricorre nel dibattito contemporaneo in filosofia, nelle scienze della vita e nelle arti. La storia di questa coppia concettuale mostra la capacità pervasiva di costruire relazioni tra i diversi oggetti della conoscenza e, cosa ancor più interessante, la possibilità di raggiungere una sintesi concettuale fra approcci metodologici differenti. Il concetto di analogia stabilisce una relazione di somiglianza tra differenti caratteri in base a una considerazione funzionale degli organismi, mentre il concetto di omologia vede piuttosto l’identità sistemica fra i caratteri: l’omologia…