1,721,260 research outputs found
Impresa, territorio e responsabilità sociale. Il caso dell’industria chimica
No full textL’attività di impresa ha effetti positivi e negativi sull’ambiente e sul territorio. In questo contesto un
ruolo chiave è giocato dalla responsabilità sociale delle imprese poiché già nella fase di creazione del
valore è possibile generare esternalità positive per la società. Il presente articolo si propone di spiegare
perché oggi i temi dell’impresa, territorio e responsabilità sociale siano così attuali e perché la teoria
degli stakeholders offra una prospettiva interessante, in relazione sia ai principi che propone sia al
processo attraverso cui viene applicata. Attenzione è rivolta al caso del settore della chimica per il quale
la responsabilità sociale è strettamente legata alla dimensione ambientale dello sviluppo sostenibile. Per
raggiungere tale obiettivo, viene brevemente descritto il rapporto tra impresa e territorio e alcuni
elementi di teoria e di prassi legati al fenomeno della responsabilità sociale dell’impresa. L’analisi del
settore della chimica è svolta da Paolo Lamberti, Presidente di Federchimica e Presidente e
Amministratore Delegato della sua società chimica Lamberti SPA
Remarks on Sobolev-Morrey-Campanato spaces defined on C0,γ domains
Full text linkWe discuss a few old results concerning embedding theorems for Campanato and Sobolev-Morrey spaces adapting the formulations to the case of domains of class C0,γ, and we present more recent results concerning the extension of functions from Sobolev-Morrey spaces defined on those domains. As a corollary of the extension theorem we obtain an embedding theorem for Sobolev-Morrey spaces on arbitrary C0,γ domains
Shape sensitivity analysis for electromagnetic cavities
Full text linkWe study the dependence of the eigenvalues of time-harmonic Maxwell's equations in a cavity upon variation of its shape. The analysis concerns all eigenvalues both simple and multiple. We provide analyticity results for the dependence of the elementary symmetric functions of the eigenvalues splitting a multiple eigenvalue, as well as a Rellich-Nagy-type result describing the corresponding bifurcation phenomenon. We also address an isoperimetric problem and characterize the critical cavities for the symmetric functions of the eigenvalues subject to isovolumetric or isoperimetric domain perturbations and prove that balls are critical. We include known formulas for the eigenpairs in a ball and calculate the first one
On the explicit representation of the trace space H32 and of the solutions to biharmonic dirichlet problems on lipschitz domains via multi-parameter Steklov problems
Full text linkWe consider the problem of describing the traces of functions in H2(Ω) on the boundary of a Lipschitz domain Ω of RN, N≥ 2. We provide a definition of those spaces, in particular of H32(∂Ω), by means of Fourier series associated with the eigenfunctions of new multi-parameter biharmonic Steklov problems which we introduce with this specific purpose. These definitions coincide with the classical ones when the domain is smooth. Our spaces allow to represent in series the solutions to the biharmonic Dirichlet problem. Moreover, a few spectral properties of the multi-parameter biharmonic Steklov problems are considered, as well as explicit examples. Our approach is similar to that developed by G. Auchmuty for the space H1(Ω) , based on the classical second order Steklov problem
L-Dopa Related Hyperhomocysteinemia: A Possible Mediator of Toxicity?.
No full textL-dopa is the most effective drug in the symptomatic management of PD and extends the life span of PD patients.The question whether L-dopa is neurotoxic remains however unresolved. In recent years, increased Homocysteine (Hcy) levels have been observed in L-dopa treated Parkinson's disease (PD) patients, resulting from L-dopa O-methylation by the enzyme catechol-O-methyltransferase. This review summarizes current evidences supporting the possible role of Hcy as mediator of L-dopa toxicity mainly on dopaminergic neurons
On a Babuška Paradox for Polyharmonic Operators: Spectral Stability and Boundary Homogenization for Intermediate Problems
Full text linkWe analyse the spectral convergence of high order elliptic differential operators subject to singular domain perturbations and homogeneous boundary conditions of intermediate type. We identify sharp assumptions on the domain perturbations improving, in the case of polyharmonic operators of higher order, conditions known to be sharp in the case of fourth order operators. The optimality is proved by analysing in detail a boundary homogenization problem, which provides a smooth version of a polyharmonic Babuska paradox
On Stein's extension operator preserving Sobolev–Morrey spaces
Full text linkWe prove that Stein's extension operator preserves Sobolev–Morrey spaces, that is spaces of functions with weak derivatives in Morrey spaces. The analysis concerns classical and generalized Morrey spaces on bounded and unbounded domains with Lipschitz boundaries in the n-dimensional Euclidean space
Design of electrical characterization method for electroporation-treated biological tissues
Full text linkThe design of a method to evaluate the efficacy of electroporation-treated (with several pulses) tissues is proposed. This method is based on the application of both the standard and a non-standard electrical characterization of biological tissues, on a platform, containing the samples under test, adopted to have minimal invasive contact measurements. Standard direct current electrical characterization was performed for comparison. For the electroporated tissues (using eight pulses), the electrical behavior of the tissue in working condition, governed by high intensity and short duration square wave stimuli, typically used in electrochemotherapy treatments, is utilized. Both electroporation stimuli application and direct current testing were performed using the same electrodes in parallel plate configuration on the parallelepiped shaped samples. The electrodes were not removed during the designed procedure to reduce the interaction with the tissue under test and the effect of different contact resistances. A finite element analysis-based numerical evaluation of the test cell used in the procedure was also performed, both with a constant and an electric field-dependent electrical conductivity, showing its robustness. The method is tested on potato samples, as an example of a biomaterial, whose electrical conductivity is electric field-dependent. The samples were subjected to a high intensity square wave pulse voltage of 100μs long, in order to evaluate the effect of multiple pulses, as a single protocol parameter. Results indicate the dependency of the electrical conductivity on the electric field strength applied using multiple pulses, and the method is easily scalable and usable as a starting point for evaluating the effect of other protocol parameters
An analyticity result for the dependence of multiple eigenvalues and eigenspaces of the laplace operator upon perturbation of the domain
No full textIn this paper, we consider the dependence of the Dirichlet eigenvalues and eigenspaces of the Laplace operator upon perturbation of the domain of definition. We prove that the dependence of a certain eigenvalue and of the corresponding eigenspace is analytic on the set of perturbations that leave the multiplicity constant
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