Browsing by Author "Abebe, Ayele"

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    Hindered Rotation of Diatomic Molecules in Inert Gas Matrices
    (Addis Ababa University, 1992-06) Abebe, Ayele
    The hindered rotation of the diatomic molecuel Co in solid Ar matrix is discussed by propesing the distortion of the octahedral symmetry of the crystal field of the matrix in the vicinity of the impurity molecule to a lower symmetry, in particular tetrahedral symmetry. The solutions of the Schrodinger equation are obtained in general form using group theory analogous to the well known Devonshire model. Numerical calculations of the energy levels and heat capacity for Co molecules in Ar are made for different strength of the crystal field. Qualitative agreement with experimental data in the temperature range 0.5 - 10K is achieved. Parameters characterizing the hindered rotation of Co molecule in Ar are predicted
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    Land Use and Land Cover Change Detection Analysis using Remote Sensing Techniques : The Case of Hawassa Town, Southern Ethiopia
    (Addis Ababa University, 2017-06) Abebe, Ayele; Wana, Desalegn
    This project examines the use of GIS and RS in mapping land use land cover change in Hawassa town between 1995 and 2016 so as to detect and analyze the change that has taken in the town between these periods. in order to achieve these the Satellite of land sat TM for 1995, Landsat ETM for 2002, ASTER image for 2009 and Land sat 8 for 2016 have been obtained and preprocessing using EARDAS IMAGINE . The maximum likelhood algorism of supervised Image classification has been used to generate land use land cover maps.Land use land classification, change map, accuracy assessment and confusion matrix by using Arc GIS. For the accuracy of the classified LULCC maps the confusion matrix was used to drive. The overall accuracy and kappa coefficient results were above the minimum and acceptable threshold level. Aggregate rate of changes of Land use and land cover of Hawassa town resulted that considerable change has occurred within twenty one (21) years from 1995 to 2016. Though the period of 1995 from 2016 there dramatic change in several LULC categories including that is , only bare land has decreased in (-40.6%), while the rest classes namely Settlement in +460.1%, wetland +66.6%, Agricultural land 14.4% and Vegetation coverage also increased by 6.4 %. . Accordingly more land brought under Settlement and Vegetation. The project output stated that increase in settlement and vegetation coverage of the town resulted population pressure on land and there is awareness of society for reforestation programme the town