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25.02.14: Presentazione del WP4

Al fine di presentare le attivitą previste da questi assegni e da altri progetti "seed" riguardanti il WP4,

25/02/2014 alle ore 14.30 in aula M2.5 (ex aula X), edificio Matematica,

si terrą un incontro all'interno del quale sono previsite le seguenti comunicazioni:

2:30pm - 2:50pm Carlos Perez Espigares - Fluctuations out of equilibrium in diffusive systems

2:50pm - 3:10pm Guido Goldoni - Electronic properties of axially symmetric semiconductor systems

3:10pm - 3:30pm Mario Li Vigni - The Multivariate Analysis approach: extract information from relevant experiments

3:30pm - 3:50pm Alice Ruini - Theoretical investigation of metal-oxide-based nanostructures for solar-light harvesting applications

3:50pm - 4:10pm Anastasia Cornelio - Numerical convex optimization in imaging

Abstract.

1. Carlos Perez Espigares, Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universitą di Modena e Reggio Emilia

Fluctuations out of equilibrium in diffusive systems

Understanding the physics of nonequilibrium systems remains as one of the major challenges of modern theoretical physics. We believe nowadays that this problem can be cracked in part by investigating the macroscopic fluctuations of the currents characterizing nonequilibrium behavior, their statistics, associated structures and microscopic origin. This fundamental line of research has been severely hampered by the overwhelming complexity of this problem. However, during the last years two new powerful and general methods have appeared to investigate fluctuating behavior that are changing radically our understanding of nonequilibrium physics: a powerful macroscopic fluctuation theory (MFT) and a set of advanced computational techniques to measure rare events. In this meeting, I will talk about the statistics of current fluctuations in nonequilibrium diffusive systems, using macroscopic fluctuation theory as theoretical framework, and advanced Monte Carlo simulations of several stochastic lattice gases as a laboratory to test the emerging picture. We will see how the discovery of novel isometric fluctuation relations opens an unexplored route toward a deeper understanding of nonequilibrium physics by bringing symmetry principles to the realm of fluctuations.

2. Guido Goldoni Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universitą di Modena e Reggio Emilia

Electronic properties of axially symmetric semiconductor systems

In semiconductor quantum nanostructures, electrons may be effectively confined in quasi-2D, quasi-1D or quasi-0D systems, with dimensionality-dependent properties. Recently, a new class of semiconductor system is emerging, where electrons are confined in a narrow layer which is bent around an axis. In these quantum systems, carrier may form both quasi-1D and quasi-2D channels. The coexisting dimensionalities and the discrete axial symmetry lead to peculiar properties of single-particle and collective states of the electron gas.

3. Mario Li Vigni, Dipartimento di Scienze Chimiche e Geologiche, Universitą di Modena e Reggio Emilia

The Multivariate Analysis approach: extract information from relevant experiments.

A brief description of the main Multivariate Analysis methods will be provided, both focusing on their potentialities in terms of planning of experiments (Design of Experiments) and extraction of the relevant information (Projection to Latent Variables methods, Wavelet-assisted decomposition and feature extraction) in the context of instrumental signal processing and image analysis. The framework to approach problems of relevance as far as Work Package 4 themes are concerned will be presented, with a preliminary attention to the elaboration of Transmission Electron Microscopy (TEM) images of nanostructure glasses in order to provide information about particle dimensions and structure.

4. Alice Ruini, Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universitą di Modena e Reggio Emilia

Theoretical investigation of metal-oxide-based nanostructures for solar-light harvesting applications

The activity will involve doped metal-oxide nanostructures, such as Al:ZnO (AZO) and TiO2 (e.g. with Nb-, Ta-, N-, C-doping), that can be exploited as transparent conductive oxides (TCO). First-principles approaches will be employed (such as density-functional theory and many-body perturbation theory schemes) to determine ground-state structural and electronic properties as well as vibrational and optical spectra. The project implies a tight interaction with experimental groups, in particular with Andrea Li Bassi (Politecnico di Milano) and Valentina De Renzi (UniMoRe).

5. Anastasia Cornelio, Dipartimento di Scienze e Metodi dell'Ingegneria, Universitą di Modena e Reggio Emilia

Numerical convex optimization in imaging

In the imaging framework, the adoption of statistical approaches, flowing from maximum likelihood to maximum a posteriori, leads to the minimization of convex functionals. We present an overview on the formulation of image deblurring and blind deconvolution and on appropriate numerical methods to solve them.