Browsing by Author "Tadele, Tamrat"

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    Analysis of Fillers for Production of Alternative Building Materials Using Magnesia Cement
    (Addis Ababa University, 2008-01) Tadele, Tamrat; Assefa, Berhanu (PhD)
    Fillers, which are available in the country, are essential for the production of magnesia cement boards. These include pumice and lignocellulostic fillers such as bagasse, sawdust and coffee husk. While applying these fillers to produce the boards, their nature and performance should be studied. Magnesia cement was used as binding materials; varying boards were produced for different proportion fillers with fixed ratio of magnesium oxide and magnesium chloride. For the board produced, density, water absorption, and setting time as well as mechanical properties such as the compressive strength and the bending strength determined. In addition, the effects of different fillers on the properties of the board and production cost were examined. When the saw dust and coffee husk filler substituted the current used bagasse filler, the water absorption and setting time of the boards reduced. While the density, bending strength and compressive strength of the board increased. The mix ratio of fillers and pumice powder had also influence on the physical and mechanical property of the boards. The test results showed as the proportion of the pumice increased, the mechanical strength of the boards increased and the setting time of the cement paste reduced. The cost analysis showed that the saw dust board production cost was lower than coffee husk and bagasse board cost. While the production cost of the coffee husk board was slightly higher than others. viii In aim of production of filler boards as alternative building materials are, the cost comparison showed in the possibility of producing relatively low price than the hollow concrete blocks included finishing work cost.
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    Christian Radio Broadcasting in Ethiopian Changing Political Context: Case Study of Yemisirach Dimts Radio
    (Addis Ababa University, 2008-11) Tadele, Tamrat; Bosch, Tanja (PhD)
    This thesis presents a historical overview of one of the religious radio programs to Ethiopia, Yemisirach Dimts (YD) Radio. It also examines a history of a major religious station, Radio Voice of the Gospel (RVOG), a station which had provided YD with technical and transmission facilities. The development that led to the founding of RVOG station and YD Radio program is overviewed. After placing the YD Radio and RVOG operations in the historical setting of Ethiopian media history, political aspects of the Ethiopian three regimes included. The study seeks to illuminate the activities and challenges of the YD Radio in changing political context. In this thesis problems of operating the radio program for last 45 years is overviewed. Governments’ policies and their bearing on programming is examined. It also explores the present situation and challenges of the YD Radio. In particular, the thesis shows the present Broadcasting Proclamation as one of the major challenges for the operation of the YD Radio. The research is purely the historical approach of the qualitative method; it depends on analyzing facts put forth by the historical documents, interviews and personal observation. Thus data for the study was acquired from documents and personal interviews with former and present employee of the YD Radio. In addition my own observation as a full time YD Radio program producer for more than six years (2001-2007) is one benefit of studying it from a historical perspective.