Browsing by Author "Awel, Mohammed"

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    Barriers to Institutional Delivery Among Pregnant Women Attending Antenatal Care in Robe Hospital and Baha Biftu Health Center, Bale Zone,Oromia Region, South East Ethiopia
    (Addis Ababa University, 2014-06) Awel, Mohammed; Araya, Tekebash (PhD)
    Background: Institutional delivery, a childbirth conducted by skilled attendant in health facility built, equipped and managed to provide safe delivery services. Concern for good pregnancy and delivery outcome make women the largest segment of population seeking care. However many efforts have been undertaking to improve utilization of delivery services in primary health services unit of Ethiopia, still utilization is low due to huge diversity of determinants. Objective:-The aim of this study was to assess Barriers to Institutional Delivery among pregnant mothers attaining Antenatal Care in Robe Hospital and Baha biftu Health Center, Bale zone, Oromia region. Method: A quantitative cross-sectional institution based study using structured interview questionnaires was conducted on 195 pregnant women attending Robe Hospital and Baha biftu health centers from April 7 to May 1. Systematic random sampling technique was used to get subjects for interview. Results: - The magnitude of health facility delivery was 41(42.3%) and home delivery was about 56 (57.7%). The main reason mentioned for home delivery of their last pregnancy was not to be attended by male midwife, which were 36(57.1%). Multiple logistic regressions were identified: numbers of gravid, arrangement for place of birth and health education during each ANC visit as significantly associated with place of delivery of last pregnancy. Conclusion: This study found that High magnitudes of home delivery among ANC attendants and number of gravid, arrangement on place of birth, health education during ANC visit and plan for place of delivery were significantly associated with health institutional delivery. Recommendation: The Bale zone and Robe town health office should still work on increasing health institution delivery through female midwife
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    Structural Analysis and Dynamic Simulation of Heavy Haul Train Coupler With Draft Gear for Rotational Effect
    (Addis Ababa University, 2015-03) Awel, Mohammed; Tolessa, Deberie (Mr.)
    Coupler and draft gear package is the most important parts of heavy haul train .In my thesis basic consideration is the structural analysis and rotational behaviour effects of heavy haul train coupler and draft gear .The structural analysis of the coupler and draft gear was analyzed by ANSYS software and the 3D modeling by CATIA .The important of structural analysis is used to determine the strength of the coupler material, the maximum deformation and stress that acted on the coupler simply determined .Those helps us to determine the critical part needs more maintenance , and also used to determine which part is wear easily. Finally the structural analysis of coupler with draft gear is important in order to increasing the performance of the heavy haul train, decreasing of the train derailment due to coupler effects. When a locomotive coupler rotates at an angle, the lateral component of the coupler force has an adverse effect on the locomotive’s safety, particularly in heavy haul trains. In this paper, a model of four locomotives and three couplers, a 100-ton heavy haul train is developed to analyse the rotation behaviour of the locomotive’s coupler system and its effect on the dynamic behaviour of such a train’s when operating on straight and curved tracks. The train model includes detailed coupler and draft gear with which to consider the hysteretic characteristics of the rubber draft gear model, the friction characteristics of the coupler knuckles, and the alignment-control characteristics of the coupler shoulder. The results indicate that the coupler’s rotation behaviour differs between the lateral force, longitudinal force and vertical forces, significantly affecting the locomotive’s running performance under the braking condition. A larger coupler rotation angle generates a larger lateral component, which increases the wheel set’s lateral force and the derailment coefficient. Decreasing the maximum coupler free angle can improve the locomotive’s operational performance and safety. Based on these results, the recommended maximum coupler free angle is 5◦.the dynamic simulation of individual coupler rotational angle due to parameter variation of forces. This parameter variation helps as to understand the coupler maximum rotational angles due to the lateral forces.