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Search Results: 1 - 10 of 461633 matches for " A. Rossani "
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Relaxation of Energy and Momentum in an Carrier-Phonon System  [PDF]
A. Rossani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.38103
Abstract: If electrons (e) and holes (h) in metals or semiconductors are heated to the temperatures Te and Th greater than the lattice temperature Tp, the electron-phonon interaction causes energy relaxation. In the non-uniform case a momentum relaxation occurs as well. In view of such an application, a new model, based on an asymptotic procedure for solving the generalized kinetic equations of carriers and phonons is proposed, which gives naturally the displaced Maxwellian at the leading order. After that, balance equations for the electron number, hole number, energy densities, and momentum densities are constructed, which constitute now a system of five equations for the electron chemical potential, the temperatures and the drift velocities. In the drift-diffusion approximation the constitutive laws are derived and the Onsager relations recovered.
Polysoliton solutions for plane discrete velocity models of a gas with chemical reactions
A. Rossani
Le Matematiche , 1991,
Abstract: Exact polysoliton solutions are given for plane discrete velocity models of a gas with chemical reactions. A technique due to Osland and Wu is systematically applied [3].
Generalized Kinetic Theory of Electrons and Phonons
A. Rossani
Mathematics , 2002, DOI: 10.1016/S0378-4371(01)00682-3
Abstract: A Generalized Kinetic Theory was proposed in order to have the possibility to treat particles which obey a very general statistics. By adopting the same approach, we generalize here the Kinetic Theory of electrons and phonons. Equilibrium solutions and their stability are investigated.
Dissociative attachment of an electron to a molecule: kinetic theory
A. Rossani,A. M. Scarfone
Physics , 2005, DOI: 10.1140/epjb/e2006-00111-4
Abstract: Test particles interact with a medium by means of a bimolecular reversible chemical reaction. Two species are assumed to be much more numerous so that they are distributed according fixed distributions: Maxwellians and Dirac's deltas. Equilibrium and its stability are investigated in the first case. For the second case, a system is constructed, in view of an approximate solution.
Travelling waves in a mixture of gases with bimolecular reversible reactions
A. Rossani,A. M. Scarfone
Physics , 2003, DOI: 10.1016/j.physb.2003.11.090
Abstract: Starting from the kinetic approach for a mixture of reacting gases whose particles interact through elastic scattering and a bimolecular reversible chemical reaction, the equations that govern the dynamics of the system are obtained by means of the relevant Boltzmann-like equation. Conservation laws are considered. Fluid dynamic approximations are used at the Euler level to obtain a close set of PDEs for six unknown macroscopic fields. The dispersion relation of the mixture of reacting gases is explicitly derived in the homogeneous equilibrium state. A set of ODE that governs the propagation of a plane travelling wave is obtained using the Galilei invariance. After numerical integration some solutions, including the well-known Maxwellian and the hard spheres cases, are found for various meaningful interaction laws. The main macroscopic observables for the gas mixture such as the drift velocity, temperature, total density, pressure and its chemical composition are shown.
Generalized Kinetic Theory of Electrons and Phonons: Models, Equilibrium, Stability
A. Rossani,A. M. Scarfone
Physics , 2003, DOI: 10.1016/S0921-4526(03)00079-6
Abstract: In the present paper our aim is to introduce some models for the generalization of the kinetic theory of electrons and phonons (KTEP), as well as to study equilibrium solutions and their stability for the generalized KTEP (GKTEP) equations. We consider a couple of models, relevant to non standard quantum statistics, which give rise to inverse power law decays of the distribution function with respect to energy. In the case of electrons in a phonon background, equilibrium and stability are investigated by means of Lyapounov theory. Connections with thermodynamics are pointed out.
Generalized Pearson distributions for charged particles interacting with an electric and/or a magnetic field
A. Rossani,A. M. Scarfone
Physics , 2009, DOI: 10.1016/j.physa.2009.03.001
Abstract: The linear Boltzmann equation for elastic and/or inelastic scattering is applied to derive the distribution function of a spatially homogeneous system of charged particles spreading in a host medium of two-level atoms and subjected to external electric and/or magnetic fields. We construct a Fokker-Planck approximation to the kinetic equations and derive the most general class of distributions for the given problem by discussing in detail some physically meaningful cases. The equivalence with the transport theory of electrons in a phonon background is also discussed.
Generalized Kinetic Equations for a System of Interacting Atoms and Photons: Theory and Simulations
A. Rossani,A. M. Scarfone
Mathematics , 2004, DOI: 10.1088/0305-4470/37/18/004
Abstract: In the present paper we introduce generalized kinetic equations describing the dynamics of a system of interacting gas and photons obeying to a very general statistics. In the space homogeneous case we study the equilibrium state of the system and investigate its stability by means of Lyapounov's theory. Two physically relevant situations are discussed in details: photons in a background gas and atoms in a background radiation. After having dropped the statistics generalization for atoms but keeping the statistics generalization for photons, in the zero order Chapmann-Enskog approximation, we present two numerical simulations where the system, initially at equilibrium, is perturbed by an external isotropic Dirac's delta and by a constant source of photons.
Nursing diagnoses identified in homeless women.
Luciana Rossani Tiradentes,Rosa Aurea Quintella Fernandes
Online Brazilian Journal of Nursing , 2008,
Abstract: An exploratory descriptive study with a quantitative approach whose objective were: to identify the nurses’ diagnoses in homeless women, using the domains and classes of the NANDA Taxonomy II as its basic structure. The sample was composed of forty homeless women, who attend philanthropic institutions in the downtown area of the city of S o Paulo. The data were collected between January thirty first and July thirty first of 2006. As for the diagnoses, forty-two classified by the NANDA Taxonomy II were identified. The ten most frequent diagnoses were: inefficient health maintenance (80%); damaged dentition (78%); constipation (35%).We identified thirty other diagnoses, which we decided to call probable, since the defining characteristics and related factors did not match the NANDA Taxonomy. Moreover, other very particular situations were identified in this population; most of them were of a social character, which had neither been included in the identified diagnoses nor in the probable ones, due to the lack of elements to classify them.
The Spread of Infectious Disease on Network Using Neutrosophic Algebraic Structure  [PDF]
A. Zubairu, A. A. Ibrahim
Open Journal of Discrete Mathematics (OJDM) , 2017, DOI: 10.4236/ojdm.2017.72009
Abstract: Network theory and its associated techniques has tremendous impact in various discipline and research, from computer, engineering, architecture, humanities, social science to system biology. However in recent years epidemiology can be said to utilizes these potentials of network theory more than any other discipline. Graph which has been considered as the processor in network theory has a close relationship with epidemiology that dated as far back as early 1900 [1]. This is because the earliest models of infectious disease transfer were in a form of compartment which defines a graph even though adequate knowledge of mathematical computation and mechanistic behavior is scarce. This paper introduces a new type of disease propagation on network utilizing the potentials of neutrosophic algebraic group structures and graph theory.
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