European Telecommunications Standards Institute
ORCID: 0000-0002-3669-0248Publishes on Electrohydrodynamics and Fluid Dynamics, Combustion and flame dynamics, Fluid Dynamics and Turbulent Flows. 188 papers and 5.2k citations.
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An efficient strategy is developed for building suitable collision operators, to be used in a simplified version of the lattice gas Boltzmann equation. The resulting numerical scheme is shown to be linearly stable. The method is applied to the computation of the flow in a channel containing a periodic array of obstacles.
An alternative simulation procedure is proposed for lattice hydrodynamics, based on the lattice Boltzmann equation instead of on the microdynamical evolution. The averaging step, used by the latter method to derive macroscopic quantities, is suppressed, as well as the associated fluctuations. The collision operator is expressed in terms of its linearized part, and condensed into a few parameters, which can be selected, independently of a particular collision rule, to decrease viscosity as much as desired.
It is shown that the lattice Boltzmann equation (LBE) for a lattice gas provides a viable numerical method for the study of three-dimensional flows in complex geometries. Numerical results for low Reynolds number flows in a three-dimensional random medium are reported. The Darcy's law is recovered and a preliminary estimation of the permeability presented.
INTRODUCTION: The K-SADS-PL diagnostic interview is useful for the cross-sectional and longitudinal evaluation of psychopathology in children and adolescents. The objective of this article was to describe the interrater reliability of the Spanish version of the Schedule for Affective Disorders and Schizophrenia for School-Age Children--Present and Lifetime version (K-SADS-PL). METHOD: The interview was translated, back-translated and adapted to Spanish. Forty psychiatric outpatients (aged 6 to 17 years) were evaluated. The interviews were videotaped and scored by three independent raters. All of them included both the child's and parent's interview. Interrater reliability was obtained for affective, anxiety and conduct disorders using the Cohen's kappa coefficient. RESULTS: Kappa coefficients were between the good and excellent range for present and lifetime disorders (major depressive disorder kappa = 0.76, any anxiety disorder kappa = 0.84, attention deficit hyperactivity disorder kappa = 0.91 and conduct disorder, kappa = 1). CONCLUSION: The Spanish version of the K-SADS-PL is a reliable instrument for the assessment of psychopathology in children and adolescents.