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Tipo: doctoralThesis
Título: Eigenvalue methods for time-dependent neuton diffusion
Autor(es): Oliveira, Roberto Gomes de
Primeiro Orientador: Não, localizado
Resumo: The analysis of pulsed neutron experiments in multiplying and in nonmultiplying domains is considered. The analysis is based on the one-dimensional diffusion theory modelo In one-group models, a scalar version of problems similar to those of Sturm Liouville systems is generated; while in multigroup models, a vector version is required. An algorithm is suggested which allows the complete solution of the general scalar problem in all separable geometries of interest, for homogeneous boundary conditions. The results are the time igenvalues and the spatial eigen functions. The algorithm is suitable for direct computer implementation. Examples of application are given. The multigroup problem can be solved by adequate extensions of the one-group algorithm. Since the associated operators are nonselfadjoint, the eigenvalues form in general a spectrum that has a discrete plus a continuous part. All of the discrete spectrum can be obtained using the suggested method. An example with two groups of neutrons in a three-region domain is given. Extensions to inhomogeneous equations and boundary conditions are considered. Application of the methods to other problems rather than the pulsed neutron problem are studied. The method is shown to be useful in the solution of nonlinear boundary-value problems. Pulsed neutron experiments can be analyzed as problems similar to Sturm-Liouville systems. The scalar problems are completely solved here. The vector problems are partially solved. Some progress in the mathematical theory of nonselfadjoint operators is required for the complete solution of the vector problem.
Palavras-chave: Neutron diffusion
Idioma: eng
País: Estados unidos
Editor: Instituto de Engenharia Nuclear
Sigla da Instituição: IEN
???metadata.dc.publisher.department???: Stanford University
???metadata.dc.publisher.program???: Eletrical Engineering
Tipo de Acesso: openAccess
Data do documento: Mai-1969
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