Search results for "11"

Mappings of Lp-integrable distortion: regularity of the inverse

2016

Let be an open set in ℝn and suppose that is a Sobolev homeomorphism. We study the regularity of f–1 under the Lp-integrability assumption on the distortion function Kf. First, if is the unit ball and p > n – 1, then the optimal local modulus of continuity of f–1 is attained by a radially symmetric mapping. We show that this is not the case when p ⩽ n – 1 and n ⩾ 3, and answer a question raised by S. Hencl and P. Koskela. Second, we obtain the optimal integrability results for ∣Df–1∣ in terms of the Lp-integrability assumptions of Kf.

Acoustic wave guides as infinite-dimensional dynamical systems

2015

We prove the unique solvability, passivity/conservativity and some regularity results of two mathematical models for acoustic wave propagation in curved, variable diameter tubular structures of finite length. The first of the models is the generalised Webster's model that includes dissipation and curvature of the 1D waveguide. The second model is the scattering passive, boundary controlled wave equation on 3D waveguides. The two models are treated in an unified fashion so that the results on the wave equation reduce to the corresponding results of approximating Webster's model at the limit of vanishing waveguide intersection.

Increasing the flexural capacity of RC beams using steel angles and pre-tensioned stainless steel ribbons

2016

This article presents an experimental programme on reinforced concrete beams retrofitted with steel angles and pre-stressed stainless steel ribbons to increase their flexural strength and ductility. Two different configurations of the steel ribbon were designed, and two companion specimens for each type considered were subjected to a four-point bending test to facilitate a direct comparison in the analysis of the effectiveness of the retrofitting technique. The influence of longitudinal steel angles and transverse stainless steel ribbons is analysed, and the concrete confinement due to stainless steel ribbons examined. The strengthened beams show remarkable increments in flexural strength a…

Do allopatric male Calopteryx virgo damselflies learn species recognition?

2012

There is a growing amount of empirical evidence that premating reproductive isolation of two closely related species can be reinforced by natural selection arising from avoidance of maladaptive hybridization. However, as an alternative for this popular reinforcement theory, it has been suggested that learning to prefer conspecifics or to discriminate heterospecifics could cause a similar pattern of reinforced premating isolation, but this possibility is much less studied. Here, we report results of a field experiment in which we examined (i) whether allopatric Calopteryx virgo damselfly males that have not encountered heterospecific females of the congener C. splendens initially show discri…

Preliminary genetic characterisation of Southern Smooth Snake Coronella girondica (Serpentes, Colubridae) populations in Italy, with some considerati…

2022

The Southern smooth snake, Coronella girondica, is a small-sized colubrid found in Northwest Africa and Southwest Europe. Mitochondrial DNA-based studies showed that the species can be split into five clades: two from Northwest Africa (one Moroccan and one Tunisian-Algerian) and three from Europe (one in the south-west of the Iberian Peninsula, one in the south-east of Spain and one in the rest of the European range). With regards to Italy, to date, only two samples have been analysed both from the Province of Pisa, Tuscany, pointing at that fact that genetic characterisation of Italian populations is still lacking. Accordingly, we have increased the sampling coverage with 19 new samples fr…

Mariano Benlliure Gil, artífice de la recuperación del patrimonio escultórico para la Cofradía California de Cartagena

2020

After the patrimonial destruction that took place during the Civil War of 1936-1939 in the city of Cartagena, religious art and especially sacred sculpture, is greatly affected. The artistic expressions that the Passionist entities took to the streets on the days of Holy Week, disappear almost in their entirety, having to start a tremendously costly reconstruction process in order to alleviate the losses suffered. The Cofradía California commissioned the renovation of its sculptural patrimony heritage, which came to replace the wealth of the works of Salzillo, to the Valencian artist Mariano Benlliure Gil. All this process is the one studied in this article, keeping in mind the different bi…

Monitoraggio e valutazione del danno degli insetti defogliatori su diverse specie di Quercus in Sicilia

Most of the insects feeding on oaks are usually ‘in balance’ with their host trees, causing occasional damage. When severe defoliations regularly occur, oak trees vulnerability to the complex of factors causing the overall decline syndrome can increase. Assessing canopy damage due to defoliating insects through the usually adopted visual methods is quite difficult, requiring highly experienced operators and a long time spent to collect field data. The present research has been carried out to investigate the different susceptibility of Sicilian oak species to defoliating insect attacks, in particular the oak moth Tortrix viridana (L.) (Lepidoptera Tortricidae), with the aim to assess the rel…

I Fondi strutturali e lo sviluppo del Mezzogiorno: il ciclo di programmazione 2000-2006. Una storia di successo?

2009

Inaugurata nel 1989 la politica regionale ha ormai raggiunto i vent’anni di attuazione. Nel 2013, anno in cui è prevista la conclusione dell’attuale ciclo di programmazione dei fondi strutturali (e probabilmente l’uscita del nostro Mezzogiorno dalle aree dell’Obiettivo 1), gli anni saranno quasi 25. Appare un tempo più che sufficiente per trarre alcuni bilanci. Per il Mezzogiorno d’Italia la politica di coesione comunitaria è stata una politica di successo? Anche se può apparire provocatoria la domanda appare legittima se si sposta la lente d’analisi dalla quantità della spesa effettuata all’interno dei vari cicli (quattro) di programmazione alla qualità e alla stabilità dei risultati otten…

Experimental Characterization and Acoustic Correction of a Multipurpose Performance Hall: The Italian Theatre “Cavallino Bianco”

2022

This study presents the retrofit acoustic dq1esign of the Italian theatre “Cavallino Bianco”. In its historical configuration, the hall had a curved roof with a pressed-plant fiber ceiling, which was demolished and replaced with a wooden roof without a false ceiling, leading to an increase in volume and a worsening of the reverberation time. This study proposed the realization of a wave ceiling and the application of sound-absorbing and reflecting panels on the walls, which have already been implemented. These modifications have affected the acoustic characterization of the theatre, as shown both through on-site measurements during the main construction phases and through numerical simulati…

Ar(t)chitectes et management : histoires d’introduction d’outils de management chez les architectes

2015

International audience; Cet article aborde la question de la (ré)conciliation entre « l’essence artistique » et la pérennité économique et sociale des agences d’architecture. Ces dernières vivent une crise identitaire et une crise de positionnement managérial liées à des contraintes économiques, sociales, environnementales et normatives, auxquelles elles n’avaient pas été préparées. L’objectif est de mieux comprendre ce phénomène à partir d’une analyse de la situation socio-organisationnelle, managériale et économique initiale d’un groupe de six agences, et leur situation après plusieurs mois de recherche-intervention. Nous proposons une analyse des modalités de l’articulation entre les act…