Condutividade e movimento de carga espacial em amostras desordenadas / Conductivity and charge displacement in disordered samples
AUTOR(ES)
Sandra Cristina Costa
DATA DE PUBLICAÇÃO
2000
RESUMO
Dispersive conductive process are characterized by non-exponential residence times of the hopping carrier. As a consequence, hereditary effects appear and the problem must be conducted in the Laplace space. A bunch of known dielectric distributions functions and others were used as possible functions describing the disordered medium. A careful study of their frequency spectrum was carried out. The truncate Widder inversion was developed in order to allow returning from the Lapace to the real time space. Two kind of practical problems were studied: dispersive conduction in which the electric field of the mobile charge may be neglected and the space charge ones when that approximation cannot be made. Two configurations of interest were selected: the corona discharge potential decay and the constant current potentinal build-up.
ASSUNTO(S)
inverse laplace transform dielectric response dispersive media substituição funcional transformadas inversas de laplace respostas dielétricas método de widder meios dispersivos widder method
