作者单位: | 1.Research Unit of Condensed Matter, Electronic and Signal Processing, Department of Physics, Dschang School of Sciences and Technology, University of Dschang, PO Box:67 Dschang, Cameroon;2.Material Science Research Group, Physics Laboratory, Department of Physics, Post Graduate School, University of Maroua, PO Box:814 Maroua, Cameroon;3.Centre d'Etudes et de Recherches en Agronomie et en Biodiversite, Faculte d'Agronomie et des Sciences Agricoles, Universite de Dschang, Cameroun |