Search results for " SCIENZA"

Effectiveness of Preservative Treatments on Coloured Ruditic Building Stones

2009

:  The dark grey Breccia di Billiemi and the Ammonitico Rosso of Piana degli Albanesi, two coloured stones widely used in monuments both outdoor and indoor in Sicily, undergo significant decay as effect of weathering: colour change and development of surface microcracks which affect not only the chromatic aspect but also the state of aggregation. In a previous study (Fracture and Failure of Natural Building Stones, 2006, Springer, Dordrecht, The Netherlands: 329), such effects were successfully reproduced on laboratory samples by means of artificial accelerated weathering and the different response of veins and grains to the ageing agents was related to the microstructure of stones. In this…

Linear ViscoElastic (LVE) Behaviour of Pure Bitumen via Fractional Model

2012

AbstractBy fitting experimental data from static creep/recovery carried out on pure bitumen, it is shown that the fractional model proposed enables the description of both creep and recovery behaviour with fewer parameters than those needed by other models in the literature. In particular, the model is fitted to experimental data of complex modulus |G*| and phase angle δ° obtained from Dynamic Mechanical Analysis. Lastly, it is demonstrated that when the fractional model is used, complex modulus isotherms for a range of frequencies can be created simply starting from isochronals at f = 1Hz.

Stability of foreign aid agreement: a general equilibrium experimental analysis

2011

The FE-Meshless multiscale approach applied to masonry structures

2015

Heterogeneous structures have an overall response that is strongly dependent on the inelastic events developing at the local level. In these structures, the most relevant kinematical and mechanical phenomena take place at a scale which is small if compared to the dimensions of the entire structure. In literature, a mesoscopic and a macroscopic scales of interest are distinguished, directly linked to as many theoretical approaches. The mesoscopic approach [1] considers materials and their interfaces individually, but many difficulties arise in the mesh creation and a fine discretization of the structure is needed, which leads to prohibitive computational costs. The macroscopic approach consi…

Introduzione. Sicurezza e cambiamento

2012

Lower bound limit analysis by bem: Convex optimization problem and incremental approach

2013

Abstract The lower bound limit approach of the classical plasticity theory is rephrased using the Multidomain Symmetric Galerkin Boundary Element Method, under conditions of plane and initial strains, ideal plasticity and associated flow rule. The new formulation couples a multidomain procedure with nonlinear programming techniques and defines the self-equilibrium stress field by an equation involving all the substructures (bem-elements) of the discretized system. The analysis is performed in a canonical form as a convex optimization problem with quadratic constraints, in terms of discrete variables, and implemented using the Karnak.sGbem code coupled with the optimization toolbox by MatLab…

MACRO-ZONES SGBEM APPROACH FOR STATIC SHAKEDOWN ANALYSIS AS CONVEX OPTIMIZATION

2013

A new strategy utilizing the Multidomain SGBEM for rapidly performing shakedown analysis as a convex optimization problem has been shown in this paper. The present multidomain approach, called displacement method, makes it possible to consider step-wise physically and geometrically nonhomogeneous materials and to obtain a self-equilibrium stress equation regarding all the bem-elements of the structure. Since this equation includes influence coefficients, which characterize the input of the quadratic constraints, it provides a nonlinear optimization problem solved as a convex optimization problem. Furthermore, the strategy makes it possible to introduce a domain discretization exclusively of…

A Derrota da Esquerda como a Direita Gosta

2001

Itália. Abril de 1996. Facto histórico. O antigo maior partido comunista do Ocidente, aliado à pequenas agregações centristas, vence as eleições nacionais, depois de passar 50 anos à margem da gestão do Estado, devido ao veto ianque, da Igreja e do capital, apesar de contar com cerca de 30% do eleitorado. O Partido da Refundação Comunista, que nascera em 1991, quando o PCI mudara de nome para Partido dos Democratas de Esquerda [PDS], assumindo-se social-democrata, apoiara, de fora, a coligação. O PRC formara-se com operários, Estalinistas, maoistas, sindicalistas, trotskistas, etc. que se haviam negado a terminar a luta anti-capitalista. Nem mesmo no horizonte político, a coligação do Ulivo…

Crisi e ordine globale. Verso il declino dell'ordine multilaterale occidentale?

2014

Agostino Scilla (1629-1700) e la cultura visuale della historia, fra antiquaria e storia naturale

Il presente lavoro affronta la questione del rapporto fra cultura visuale e pratiche di conoscenza storica e scientifica nel secondo Seicento, attraverso l’esame della vicenda intellettuale di Agostino Scilla (Messina 1629- Roma 1700) pittore, antiquario e filosofo naturale di scuola galileiana. L’ipotesi che si intende dimostrare è che la molteplicità prismatica della vicenda intellettuale di Scilla, finora poco conosciuta e affrontata attraverso gli approcci mutuamente esclusivi della storia dell’arte e della storia della scienza, possa essere ricondotta a coerenza attraverso un approccio ravvicinato alla questione della cultura visuale, espressa tanto nell’attività pittorica quanto nella…