On an air quality and odor modeling system for CMPC Celulose Riograndense

The present work is part of the research project that aims to create an automated system for the evaluation of air pollution and odour for CMPC CELULOSE RIOGRANDENSE. Initially, three different ways of initializing the CALPUFF model (one of the models under evaluation to compose the system) were evaluated. The results when compared with observational data on air quality suggest the need for a validation of the boundary conditions and turbulent scale parameters in the hourly time representation when CALPUFF is the model being used. The choice was not random, but based on three quantities that impose physical affinity to micrometeorological data. The surface roughness, the albedo and the Bowen ratio. Changes in these quantities were imposed during pre-processing of AERMET, which established the quantities of interest in a simulation of dispersion of pollutants. After this alternative the results become more representative for the atmospheric dispersion process. The monthly and annual representation of the CALPUFF model is satisfactory without validation procedure

Um Perfil Dinâmico de Plumas Através da Análise Perturbativa da Equação da Dispersão de Poluentes em Coordenadas Cilíndricas

O presente trabalho usa métodos de perturbação e coordenadas cilíndricas para simplificar a equação advectivo-difusiva da dispersão de poluentes. Os resultados corroboram os de PELLEGRINI et al. (2013), obtidos em coordenadas cartesianas, e exibem interessantes simplificações resultantes da simetria axial inerente ao problema

Self-reciprocal fermion mass ratios from massless QED with curved momentum space

The present investigation is an attempt to understand the fermion mass ratios in the framework of QED of charged fermions without a bare mass. Since QED of massless charged fermions is invariant under the dilatation transformation, this symmetry has to be spontaneously broken to obtain massive fermions. In the proposed model we combine a mass-scale normalisation with the renormalisation procedure, assuming the fermion momentum space being a four-dimensional one-shell hyperboloid embedded in a five-dimensional space. The hyperboloid constrains the allowed fermion field solutions. We construct the theory in the conventional way using equal time anti-commutator and the Lagrangian formalism. Starting from the Dyson–Schwinger equation for fermion propagator in the Landau gauge, we derive the fermion mass function and self-reciprocal solutions for the mass ratios, which are independent of any constant

Stochastic Wind Profiles Determination for Radioactive Substances Released from Nuclear Power Plants

In this review we discuss a stochastic turbulent wind proï¬le based on the three-dimensional stochastic Langevin equation for Gram-Chalier probability density function and a known mean wind velocity. Its solution permits to simulate radioactive substances dispersion in a turbulent regime, which is of interest for nuclear reactor accident scenarios and their related emergency actions. We discuss the stochastic Langevin equation together with an analytical method for solving the three-dimensional and time dependent equation which is then applied to radioactive substance dispersion for a stochastic turbulence model. The solution is obtained using the Adomian Decomposition Method, which provides a direct scheme for solving the problem without the need for linearisation and any transformation. The results of the model are compared to case studies with measured data and further compared to procedures and predictions from other approaches

On a model for pollutant dispersion in the atmosphere with partially reflective boundary conditions and data simulation using CALPUFF

The present work is an attempt to simulate the dispersion of pollutants in the surroundings of the thermoelectric plant located in Linhares from a new mathematical model based on partially reflective boundaries in the deterministic advection-diffusion equation. In addition to the advection-diffusion equation with partially reflective boundaries, it was used data simulated with the CALPUFF model. The exposed model was validated previously with the Hanford and Copenhagen experiments and the results indicate that effects on the boundaries are essential to model dispersion phenomenona in the atmospheric boundary layer