Browsing by Author "Yasin, Ahmed"

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    Characterization and Treatment of Beseka Lake Water Quality Using Microbes to reduce Total Dissolved Solid (TDS) and Alkalinity
    (Addis Ababa University, 2018-07) Yasin, Ahmed; Solomon, Kiros (PhD)
    Water is one of the natural resource that used for irrigation, industrial, sanitation and other purpose that facilitate human activity. Lake Beseka is volcanically dammed, endorheic lake, which is located to the East direction, situated around 200 km from Addis Ababa, the capital city of Ethiopia. The Lake water is saline and alkaline with high concentration of fluoride so that the water could not be used for drinking and irrigation purpose. Different infrastructures such as a health center, high school, youth center, offices and others were affected by the lake flooding. So, this lake needs to be treatment. In present study, biological neutralization of saline- alkaline beseka lake water in the presence of glucose (carbohydrate) as carbon source was studied. To do so, determination of physiochemical characteristics of the lake water, which was pH, EC, TDS, HCO3 - , total alkalinity, chloride and fluoride were measured and also isolation of bacteria were carried out. In this study Bacillus alkalophilus bacteria was also used to compare its treatment performance with isolate (T1). Treatments of lake water sample at different pH, incubation time and inoculum size were monitored. Maximum removal of total alkalinity and TDS (Total Dissolved Solid) were observed at pH, incubation time and inoculum size of 9,72hr and 32ml respectively. Which is resulted in removal of total alkalinity; 774.669mg/l and TDS;1939.92mg/l for isolated (T1) and total alkalinity;779.631mg/l and TDS;1944.97mg/l for Bacillus alkalophilus from original value. Based on these findings, isolated (T1) bacteria were shown to be have good performance for biological treatment of beseka lake.
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    Practices and Challenges of School Leaders in Implementing Teachers Continuous Professional Development in the Secondary Schools of Kamash Zone, Benishangul Gumuz Regional State
    (Addis Ababa University, 2019-09) Yasin, Ahmed; Zergaw, Demis (PhD)
    The purpose of the study was to assess the practices and challenges of school leaders in the implementation of continuous professional development in the secondary schools of the Kamashi Zone of the Benishangul Gumuz National Regional State. To that effect, a descriptive research design which employs both quantitative for the questioners and qualitative for the interview and document analyses approach was used to conduct the study. Samples were drawn from teachers, principals, vice principals, supervisors and Woreda Education Bureau TDP coordinators. The sampling techniques used included purposive and availability sampling. The data gathering tools employed were questionnaire, interview as well as document analysis. Quantitative data were analyzed using frequency, percentage, standard deviation, and mean score while qualitative data were analyzed thematically. Results of the study revealed that school principals were not able to create favorable situations for teachers to get diverse training, undertake educational research, get professional support and participate in joint planning of CPD programs. The major challenges encountered by school principals in the implementation of CPD were lack of budget, professional support from Woreda Education Office, knowledge and skills in CPD program, and trained CPD facilitators. Based on the results, it was concluded that CPD was not effectively implemented. And, based on the conclusion, it was recommended that school principals should initiate teachers to undertake educational research, facilitate conditions for teachers to get different training, involve teachers in joint planning of CPD.