Search results for "CLOSURE"

The Kuratowski convergence and connected components

2012

International audience; We investigate the Kuratowski convergence of the connected components of the sections of a definable set applying the result obtained to semialgebraic approximation of subanalytic sets. We are led to some considerations concerning the connectedness of the limit set in general. We discuss also the behaviour of the dimension of converging sections and prove some general facts about the Kuratowski convergence in tame geometry.

High Precision Astrometry Over Large Angular Scales with Closure Constraints: The Triplet 1803+784/1928+738/2007+777

1996

The technique of differential astrometry using the phase-delay VLBI observable promises fractional precisions of ~2 × 10−9 in the determination of the separation of sources 5° or 6° apart on the sky (Guirado et al. 1995a; Lara et al. 1996). In our present research we seek further improvement in this technique through using triplets of radio sources, which provide a closure constraint in the determination of relative angular positions. This constraint not only eases the resolution of the phase-cycle ambiguities (a major problem in the least-squares approach to astrometry with phase delays), but it also strongly constrains the space of allowable parameter values.

Risk Disclosure in the European Banking Industry: Qualitative and Quantitative Content Analysis Methodologies

2022

This book aims to shed light on the advantages and disadvantages of both qualitative and quantitative content analysis methodologies by examining risk disclosure practices in the European banking industry. Content analysis methodologies allow to assess the level of transparency of financial and non-financial reports by focusing on the information disclosed to the public with reference to their risk exposure and management. There is an ongoing debate in the literature to understand whether qualitative or quantitative content analysis methodologies are more effective and useful to analyse disclosure practices. Some authors contend that qualitative methodologies may be more appropriate because…

I diritti dei consumatori dopo la Direttiva 2011/83/UE

2013

Il saggio offre una disamina critica dei contenuti della Direttiva 2011/83/UE, anche in rapporto agli obiettivi annunciati nella Proposta ( e poi abbandonati), soffermandosi particolarmente sulle regole in tema di obblighi di informazione al consumatore.Alla luce di queste regole, la nuova Direttiva si rivela quale ulteriore significativa conferma della scelta che affida l'obiettivo della trasparenza contrattuale a rigide prescrizioni di forma e contenuto dell'informazione, lungo un processo che qui viene definito di "standardizzazione" delle condotte del professionista. L'obiettivo di disclosure viene affidato non a tecniche di controllo e verifica del concreto livello di informazione offe…

Monotonicity and enclosure methods for the p-Laplace equation

2018

We show that the convex hull of a monotone perturbation of a homogeneous background conductivity in the $p$-conductivity equation is determined by knowledge of the nonlinear Dirichlet-Neumann operator. We give two independent proofs, one of which is based on the monotonicity method and the other on the enclosure method. Our results are constructive and require no jump or smoothness properties on the conductivity perturbation or its support.

Enclosure method for the p-Laplace equation

2014

We study the enclosure method for the p-Calder\'on problem, which is a nonlinear generalization of the inverse conductivity problem due to Calder\'on that involves the p-Laplace equation. The method allows one to reconstruct the convex hull of an inclusion in the nonlinear model by using exponentially growing solutions introduced by Wolff. We justify this method for the penetrable obstacle case, where the inclusion is modelled as a jump in the conductivity. The result is based on a monotonicity inequality and the properties of the Wolff solutions.

La ficción de educar a distancia

2020

La suspensión de las clases provocada por el COVID-19 y la decisión de continuar con el curso a distancia han implicado que el sistema educativo haya pasado a funcionar sin la presencia de alumnado y profesorado en la escuela. Este artículo sostiene que, en esas circunstancias, el sistema no puede garantizar el derecho a la educación de todo el alumnado. Su objetivo es analizar qué ideas fundamentan la ficción de que sí puede hacerlo, por qué motivos se ha construido y aceptado esta ficción, y qué efectos negativos puede tener. Por último, se ofrecen propuestas de política pública para mitigar estos efectos.

Importance of social and sustainability reporting in ensuring transparency and disclosure

2014

Fatigue Crack Growth for Different Ratios of Bending to Torsion in AlCu4Mg1

2008

The paper contains the fatigue crack growth test results obtained under proportional bending with torsion in AlCu4Mg1 aluminium alloy [1]. Specimens with rectangular cross sections and dimensions: length l = 90 mm, height w = 10 mm and thickness g = 8 mm were tested [2]. Each specimen had an external unilateral notch with depth 2 mm and radius ρ = 0.2 mm. The tests were performed under the stress ratio R = −1. The notches in the specimens were cut with a milling cutter and their surfaces were polished after grinding. The tests were realized on a fatigue test stand MZGS-100 where the ratio of torsion moment to bending moment was \( M_T (t)/M_B (t) = tg\alpha = \sqrt 3 /3,1{\text{ }}and\sqrt …

Fatigue crack growth through particulate clusters in polycarbonate material

2011

The interaction of a crack with a perfectly bonded inclusion or a cluster of inclusions in polycarbonate matrix was investigated through both numerical simulations and fatigue tests. Stress intensity factors (K(I)) were evaluated by boundary element method for several particle sizes, position and finally for inclusion cluster as a precursor study for the experiments. The numerical simulation has shown the crack tendency to circumvent the inclusions with consequential reduction of the growth rate. Fatigue crack growth tests were carried out on several particle-filled specimens at constant value of the applied stress intensity factor range (Delta K(Iapp)) highlighting the crack delay due to t…