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Search Results: 1 - 10 of 200707 matches for " P. Pedroni "
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Higher order forward spin polarizability
B. Pasquini,P. Pedroni,D. Drechsel
Physics , 2010, DOI: 10.1016/j.physletb.2010.03.007
Abstract: As a guideline for future experiments to extract the four (leading) spin polarizabilities of the nucleon, we have constructed the forward amplitude for polarized Compton scattering by dispersion integrals. These integrals have been saturated by recently measured helicity-dependent photoabsorption cross sections as well as predictions for pion photoproduction multipoles from several phenomenological descriptions and chiral perturbation theory. The comparison of these results corroborates the strategy to extract the spin polarizabilities by fitting them to polarized Compton data and fixing all higher order spin effects by dispersion relations based on pion photoproduction multipoles.
On the Bi-Hamiltonian Theory for the Harry Dym Equation
Marco Pedroni,Vincenzo Sciacca,Jorge P. Zubelli
Mathematics , 2001,
Abstract: We describe how the Harry Dym equation fits into the the bi-Hamiltonian formalism for the Korteweg-de Vries equation and other soliton equations. This is achieved by means of a certain Poisson pencil constructed from two compatible Poisson structures. We obtain an analogue of the Kadomtsev-Petviashivili hierarchy whose reduction leads to the Harry Dym hierarchy. We call such system the HD-KP hierarchy. Then, we construct an infinite system of ordinary differential equations (in infinitely many variables) that is equivalent to the HD-KP hierarchy. Its role is analogous to the one played by the Central System for the Kadomtsev-Petviashivili hierarchy.
Requisitos para adocao de sistemas operacionals embarcados
Maiko R. Moroz,Ricardo P. Jasinski,Volnei A. Pedroni
Visión Electrónica , 2012,
Abstract: Embedded systems are part of numerous applications, most of whichinclude real-time or specialized operating systems. The operating systemmust be chosen taking into account functional and technical characteristicsof the embedded product. This paper presents a survey onthe main requirements to help determine whether an operating systemshould be used in an embedded design, further we show how these requirementsmay be used for assessing the operating system selection.
Bi-Hamiltonian Aspects of a Matrix Harry Dym Hierarchy
Laura Fontanelli,Paolo Lorenzoni,Marco Pedroni,Jorge P. Zubelli
Physics , 2006,
Abstract: We study the Harry Dym hierarchy of nonlinear evolution equations from the bi-Hamiltonian view point. This is done by using the concept of an S-hierarchy. It allows us to define a matrix Harry Dym hierarchy of commuting Hamiltonian flows in two fields that projects onto the scalar Harry Dym hierarchy. We also show that the conserved densities of the matrix Harry Dym equation can be found by means of a Riccati-type equation.
A Bi-Hamiltonian Theory for Stationary KdV Flows and their Separability
Gregorio Falqui,Franco Magri,Marco Pedroni,Jorge P. Zubelli
Physics , 2000,
Abstract: We present a fairly new and comprehensive approach to the study of stationary flows of the Korteweg-de Vries hierarchy. They are obtained by means of a double restriction process from a dynamical system in an infinite number of variables. This process naturally provides us with a Lax representation of the flows, which is used to find their bi-Hamiltonian formulation. Then we prove the separability of these flows making use of their bi-Hamiltonian structure, and we show that the variables of separation are supplied by the Poisson pair.
Structural Panel VARs
Peter Pedroni
Econometrics , 2013, DOI: 10.3390/econometrics1020180
Abstract: The paper proposes a structural approach to VAR analysis in panels, which takes into account responses to both idiosyncratic and common structural shocks, while permitting full cross member heterogeneity of the response dynamics. In the context of this structural approach, estimation of the loading matrices for the decomposition into idiosyncratic versus common shocks is straightforward and transparent. The method appears to do remarkably well at uncovering the properties of the sample distribution of the underlying structural dynamics, even when the panels are relatively short, as illustrated in Monte Carlo simulations. Finally, these simulations also illustrate that the SVAR panel method can be used to improve inference, not only for properties of the sample distribution, but also for dynamics of individual members of the panel that lack adequate data for a conventional time series SVAR analysis. This is accomplished by using fitted cross sectional regressions of the sample of estimated panel responses to correlated static measures, and using these to interpolate the member-specific dynamics.
Bi-Hamiltonian aspects of the separability of the Neumann system
Marco Pedroni
Physics , 2002,
Abstract: The Neumann system on the 2-dimensional sphere is used as a tool to convey some ideas on the bi-Hamiltonian point of view on separation of variables. It is shown that, from this standpoint, its separation coordinates and its integrals of motion can be found in a systematic way.
Método para la evaluación de un microcontrolador de núcleo abierto
Sibilla B. Luz,Christophe F. L. Bricout,Ricardo P. Jasinski,Volnei A. Pedroni
Visión Electrónica , 2011,
Abstract: La etapa de verificación desempe a un papel fundamental en el dise o e implementación de microcontroladores. Con el fin de realizar una verificación acertada del dise o, son utilizadas algunas técnicas de verificación funcional tales como: pruebas definidas por el dise ador para verificar el desempe o ante casos extremos, la simulación a través detestbenches, y la ejecución de aplicaciones extensas. El proyecto propuesto en este trabajo tiene como objetivo desarrollar e implementarun método para la evaluación de un microcontrolador de núcleo abierto,con la realización de pruebas directamente sobre el hardware. Este enfoque presenta como ventajas, un proceso mucho más rápido que otros métodos que emplean simulaciones y menos requerimiento de memoria para las pruebas. Un Ethernet IP Core ha sido integrado al proyecto, con el fin de hacer que el método sea independiente del sistema operativo, de la arquitectura de microprocesador y de la herramientade dise o.
Natural connections for semi-Hamiltonian systems: The case of the $ε$-system
Paolo Lorenzoni,Marco Pedroni
Physics , 2009, DOI: 10.1007/s11005-011-0469-x
Abstract: Given a semi-Hamiltonian system, we construct an $F$-manifold with a connection satisfying a suitable compatibility condition with the product. We exemplify this procedure in the case of the so-called $\epsilon$-system. The corresponding connection turns out to be flat, and the flat coordinates give rise to additional chains of commuting flows
Gel'fand-Zakharevich Systems and Algebraic Integrability: the Volterra Lattice Revisited
Gregorio Falqui,Marco Pedroni
Physics , 2005,
Abstract: In this paper we will discuss some features of the bihamiltonian method for solving the Hamilton-Jacobi (H-J) equations by Separation of Variables, and make contact with the theory of Algebraic Complete Integrability and, specifically, with the Veselov--Novikov notion of algebro-geometric (AG) Poisson brackets. The "bihamiltonian" method for separating the Hamilton-Jacobi equations is based on the notion of pencil of Poisson brackets and on the Gel'fand-Zakharevich (GZ) approach to integrable systems. We will herewith show how, quite naturally, GZ systems may give rise to AG Poisson brackets, together with specific recipes to solve the H-J equations. We will then show how this setting works by framing results by Veselov and Penskoi about the algebraic integrability of the Volterra lattice within the bihamiltonian setting for Separation of Variables.
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