Search results for "CRAC"

Autoritarismo global

2003

Latinoamérica y Vargas Llosa / 1

2006

Mirando desde atrás con ira

1978

Harnessing ICT to develop community and identity: a model for academic departments

2006

Universities have been early adopters of Information and Communication Technologies (ICT). However, does availability imply use? How is ICT being used by academic departments? This article addresses these questions, and discusses the use of ICT to support research, instruction and service, but more specifically, the use of ICT to enhance a sense of identity and community across all members of a department. The authors' observations of university departments across the Atlantic reveal very limited uses of ICT. A democratic web-based academic departmental community model is proposed to assist in the strengthening of departmental identity and community as well as advancing its mission. Concept…

Performance improvements of asphalt mixtures by dry addition of polymeric additives

2017

This paper shows the results of an experimental study concerning the development and optimization of asphalt mixtures for binder and base courses, improved with specifically engineered additives. The focus was on the mechanical improvements of the mixtures as achievable via dry modification with polymeric additives by making use of aggregate and bitumen of average quality, as locally available, in order to limit the consumption of virgin materials. The results allowed interesting conclusions to be drawn about the use of polymeric additives for these mixtures. In particular, the modified mixtures proved to have better performance in terms of both permanent deformation resistance and stiffnes…

A model for SFRC beams without shear reinforcement

2008

In this paper a physical model, for the prediction of ultimate shear strength of Steel Fibers Reinforced Concrete (SFRC) beams is developed from the plastic Crack Sliding Model (CSM) introduced by Zhang (1997), based on the hypothesis that cracks can be transformed into yield lines. In this work the effectiveness factors are recalculated for SFRC beams and some further developments are introduced in the CSM, taking into account the fundamental post cracking tensile strength contribute of SFRC. The proposed model is validate by a large set of tests collected in literature and some numerical analyses were carried out to show the influence of fibers on the failure beams mode.

Temporary Strengthening Technique of Marble Columns with Steel Wires and Wood Spars

2014

Granite, marble and heavy stone columns have been used in the architects from all the ages to answer to both aesthetical and structural requirements in ancient churches and historical buildings. Such materials offer great visual impact and have mechanical properties that allow their use in construction and to obtain bright and slender structures. Marble is a very high strength but brittle material. It often occur that marble or granite columns of historical building are cracked along their height due to external actions and the risk of buckling occurs. Because this kind of failure is sudden and very brittle in stone and rocks, an immediate strengthening of the columns is needed. Among e tem…

Disinformazione nelle città

2023

Nell‘ambito della Smart Specialisation Strategy (RIS3), strategie di innovazione nazionali o regionali per la crescita intelligente, sostenibile e inclusiva nell’Unione Europea per il prossimo decennio, finanziata dall’Unione Europea, la Regione Siciliana ha promosso il progetto Fake News in accordo con la finalità di sviluppare strumenti di scambio informativo e confronto in rete. L’obiettivo è di concentrare le risorse europee in settori tecnologici emergenti che realmente possono svilupparsi nella stessa regione puntando sulla costruzione di saperi locali, piuttosto che sul trasferimento di risorse tecnologiche esterne. Si sperimenta un’applicazione di tecnologie ICT al fenomeno della di…

Dual Boundary Element Method for fatigue crack growth: implementation of the Richard’s criterion

2013

A new criterion for fatigue crack growth, whose accuracy was previously tested in the literature with the Finite Element Method, is here adopted with a Dual Boundary Element formulation. The fatigue crack growth of an elliptical inclined crack, embedded in a three dimensional cylindrical bar, is analyzed. In this way in addition to the propagation angle estimated by the Sih’s criterion, it is possible to take into account a twist propagation angle. The two propagation criteria are compared in terms of shape of the propagated crack and in terms of SIFs along the crack front. The efficiency of the Dual Boundary Element Method in this study is highlighted.

Experimental evaluation of through-the-thickness stress distribution in transverse crack tension test samples

2015

Transverse Crack Tension (TCT) samples represent an alternative to End Notched Flexure configurations for the characterization of pure mode II fracture toughness of Fibre Reinforced Polymer composites. TCT is supposed to reproduce a pure Mode II failure mechanism while avoiding the frictional energy dissipation between the flanks of a starter crack. The TCT geometry is that of a unidirectional tensile sample where a number of embedded plies, centered on the middle plane, are cut in the transverse fibres direction. The tensile loading should then activate four symmetric fronts of mode II delamination from the transverse cut tips. The present work describes the implementation of two full fiel…