Search results for "IRI"
showing 10 items of 12514 documents
On the existence and multiplicity of solutions for Dirichlet's problem for fractional differential equations
2016
In this paper, by using variational methods and critical point theorems, we prove the existence and multiplicity of solutions for boundary value problem for fractional order differential equations where Riemann-Liouville fractional derivatives and Caputo fractional derivatives are used. Our results extend the second order boundary value problem to the non integer case. Moreover, some conditions to determinate nonnegative solutions are presented and examples are given to illustrate our results.
Multiplicity of solutions for two-point boundary value problems with asymptotically asymmetric nonlinearities
1996
ANALYSIS OF A SPHERICAL HARMONICS EXPANSION MODEL OF PLASMA PHYSICS
2004
A spherical harmonics expansion model arising in plasma and semiconductor physics is analyzed. The model describes the distribution of particles in the position-energy space subject to a (given) electric potential and consists of a parabolic degenerate equation. The existence and uniqueness of global-in-time solutions is shown by semigroup theory if the particles are moving in a one-dimensional interval with Dirichlet boundary conditions. The degeneracy allows to show that there is no transport of particles across the boundary corresponding to zero energy. Furthermore, under certain conditions on the potential, it is proved that the solution converges in the long-time limit exponentially f…
The Nitsche phenomenon for weighted Dirichlet energy
2018
Abstract The present paper arose from recent studies of energy-minimal deformations of planar domains. We are concerned with the Dirichlet energy. In general the minimal mappings need not be homeomorphisms. In fact, a part of the domain near its boundary may collapse into the boundary of the target domain. In mathematical models of nonlinear elasticity this is interpreted as interpenetration of matter. We call such occurrence the Nitsche phenomenon, after Nitsche’s remarkable conjecture (now a theorem) about existence of harmonic homeomorphisms between annuli. Indeed the round annuli proved to be perfect choices to grasp the nuances of the problem. Several papers are devoted to a study of d…
A matter of style? testing the moderating effect of driving styles on the relationship between job strain and work-related crashes of professional dr…
2020
Abstract Different empirical studies suggest that both job strain and driving styles are significant contributors to the work-related traffic crashes suffered by professional drivers. Nevertheless, the current evidence falls considerably short when explaining why driving styles may modify (or not) the relationship between occupational stressors and professional drivers’ safety outcomes. The aim of this study was to examine whether driving styles moderate the effect of job strain on professional drivers’ Work Traffic Crashes (WTCs). This research was performed using the data collected from a sample of 753 professional drivers, responding to a self-report questionnaire on job strain (work str…
Interaction of methyltin(IV) compounds with carboxylate ligands. Part 2: Formation thermodynamic parameters, predictive relationships and sequesterin…
2008
Thermodynamic data of mono-, di- and tri-methyltin(IV)-carboxylate complexes (acetate, malonate, succinate, oxydiacetate, diethylenetrioxydiacetate, malate, citrate, 1,2,3-tricarballylate, 1,2,3,4-butanetetracarboxylate, 1,2,3,4,5,6-benzenehexacarboxylate) in aqueous solution are reported at t = 25 °C and I = 0 mol l−1. Thermodynamic parameters obtained were analysed to formulate empirical predictive relationships as a function of different parameters, such as the number of carboxylate groups of the ligand and the charge of the alkyltin(IV) cation. Sequestration diagrams of citrate and 1,2,3-tricarballylate towards alkyltin(IV) cations at different pH values are also reported and discussed.…
Sulla natura del giudizio del Tribunale Nazionale di Arbitrato per lo Sport. Nota a lodo arbitrale Ascoli calcio s.p.a. v. Federazione Italiana Giuoc…
2010
An approach to the high mountain settlements in the Pyrenees from Archaeology and Ethnography
2021
En este artículo se presentan los resultados de un trabajo de investigación destinado a verificar la existencia de diversos modelos de poblamiento en las zonas de alta montaña de los Pirineos a lo largo de la historia. Para ello se ha contrastado la documentación etnográfica sobre los pastores trashumantes recogida a principios del s. XX con el registro arqueológico obtenido durante diversas campañas de prospección llevadas a cabo en el Parque Nacional de Aigüestortes i Estany de Sant Maurici (Lérida). Los resultados de la investigación permiten verificar la existencia de cómo mínimo tres modelos de poblamiento basados en prácticas ganaderas distintas a la ganadería trashumante tradicional …
Art. 124. Consultabilità a scopi storici degli archivi correnti
2019
The essay examines forms of access to public administration archives for historical purposes.