Encontrados 6 documentos, a visualizar página 1 de 1
Vibrational energy transfer in N(2D)+N2 collisions: a quasiclassical trajectory...
Galvão, B. R. L.; Varandas, A. J. C.; Braga, J. P.; Belchior, J. C.Rate coefficients for the N(2D)+N2 collisions were calculated employing quasiclassical trajectories and the first available set of potential energy surfaces for such excited nitrogen interactions. The details of the vibrational energy transfer are discussed, such as the contributions from reactive and non-reactive trajectories as well as the contribution of each electronic symmetry. The calculated state-to-stat...
A general algorithm to solve linear and nonlinear inverse problems
Lemes,N. H. T.; Borges,E.; Braga,J. P.A general algorithm to solve linear and nonlinear inverse problems, based on recursive neural networks, is discussed in this work. The procedure will be applied to physical chemical problems modeled by integral, differential and eigenvalue equations. Representative applications discussed are in positron lifetime spectroscopy, chemical kinetics and vibrational spectroscopy. The method is robust with respect to e...
Probability density function from experimental positron annihilation lifetime s...
Viterbo,V.C.; Sebastião,R.C.O.; Monteiro,R.P.G.; Magalhães,W.F.; Braga,J.P.Inversion of experimental positron annihilation lifetime spectra was carried out to obtain the probability density function. Apparatus resolution together with experimental noise was taken into consideration while solving this ill posed problem. The singular value decomposition approach, moving the boundary between the subspaces was the theoretical formulation to calculate the probability density function. For ...
A formulação ab-initio da segunda lei da termodinâmica
Braga,J. P.This paper deals with Carathédory's formulation of the second law of thermodynamics. The material is presented in a didatical way, which allows a second year undergraduate student to follow the formalism. An application is made to an ideal gas with two independent variables. A criticism to Carnot formulation of the second law and an investigation of the historical origins of the Carathéodory formalism are also ...
Aplicação do modelo geométrico no estudo dos efeitos glory e rainbow em colisõe...
Lemes,N. H. T.; Belchior,J. C.; Braga,J. P.A simple analysis of glory and rainbow effects, together with the description of their trajectories is given by the geometric model. The energy dependence of glory and rainbow impact parameters and the energy dependence of the rainbow angle are determined analytically within the model. An universal function for glory and rainbow trajectories can be easily determined.
Quantum Charge Transfer Study of Triply Charged Ions in the Adiabatic Represent...
López-Castillo,A.; Belchior,J.C.; Braga,J.P.Full quantum charge transfer study of the process B3+ + He -> B2+ + He+ has been investigated in the collision energy range 1-102 eV using an ab-initio interaction potential. A new method to solve the Schrödinger equation in an adiabatic basis was used, where the radial and rotational coupling were taken into account, and the importance of the coupling between states of different symmetry was discussed. Moreove...
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