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Search Results: 1 - 10 of 95 matches for " Abera Gemechu Doti "
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Causes and Effects of Land Size Variation on Smallholder’s Farm-Income: The Case of Kombolcha District of East Hararghe, Oromia, Ethiopia  [PDF]
Abera Gemechu Doti
Open Access Library Journal (OALib Journal) , 2017, DOI: 10.4236/oalib.1103312
Abstract:
For farmers, farmland is a basis of their livelihood and the basic agricultural resource and is now becoming a constraint in agricultural production. This study was carried out in Kombolcha district of Oromia National Regional State. The specific objectives of the study were to identify the factors affecting size of landholding and to analyze the effects of land size variation on farm income. To address these objectives a two-stage random sampling procedure was used to select 5 peasant associations and 110 sample respondents from a total of 19 peasant associations found in the district. Multiple linear regression and Cobb-Douglass production functions were used for analyzing the cause of land size variation and effects of land size variation on farm income respectively. Accordingly, age of the household head, agro ecology, family size and land availability in PA were found to be the significant factors in causing variation in size of land holding in the study area. The regression coefficients of the Cobb-Douglass production function indicate that the size of cultivated land, average land productivity, livestock owned and non-farm income were statistically significant factors in explaining variation in farm income among farmers. Therefore, there should be urgency of devising means and ways to improve the farm income through strengthening the production of cash crops. Besides this, productivity of land should be increased through the introduction of high yielding varieties of crops. And there should be strategy to create non-farm income sources for the smallholder farmers.
Star Formation in Magnetized, Turbulent and Rotating Molecular Cloud: The Critical Mass  [PDF]
Gemechu Muleta Kumssa, Solomon Belay Tessema
International Journal of Astronomy and Astrophysics (IJAA) , 2018, DOI: 10.4236/ijaa.2018.84025
Abstract: In this paper, we present the critical mass of magnetized, turbulent and rotating star-forming molecular cloud core (MCc) in the presence of magnetic tension. The critical mass of star-forming magnetized cloud is influenced by the magnetic tension, magnetic pressure and other pressures. Applying the method of theoretical modelling by taking into account the basic equations and assumptions, we formulate the critical mass of magnetized MCc in different cases. Accordingly, the minimum critical masses we find in both cases are different. Energy due to magnetic tension significantly triggers the collapse at relatively larger radius of the core. The model shows that when the initial radius of the parent cloud (Ro) is larger than that of collapsing core radius (Rcore) the magnetic tension also has the larger radius of curvature, so it plays a significant role in supporting gravity to collapse the core. The results indicate gravity without magnetic tension may not overcome magnetic pressure, turbulence pressure and pressure due to rotation. This shows the critical mass of MCc for the collapse depends on the tension force that magnetic field lines apply on the envelope. We conclude that if there is magnetic pressure in star-forming MCc, there is also unavoidable magnetic tension, which triggers the collapse of the core. If there is no magnetic tension, the magnetized MCc needs relatively larger mass and higher density within the small size to collapse.
Coexistence of Superconductivity and Antiferromagnetism in SmAsO1-xFxFe  [PDF]
Abera Mebrahtu, P. Singh
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.53016
Abstract: Superconductivity and magnetism have been interesting topics in condensed mater physics and they have been studied experimentally and theoretically for many years. These two cooperative phenomena are antagonistic until the discovery of some rare earth ternary compounds that show the coexistence of superconductivity and magnetism. In some of the recently discovered iron-based layered superconductors, superconductivity and magnetism coexist. In the present work we examine the possibility of coexistence of antiferromagnetism and superconductivity in samarium arsenide oxide superconductor (SmAsO1-xFxFe). Using a model of the Hamiltonian and retarded double time Greens function formalism, we found expressions AFM order Parameter (η) and AFM transition temperature (Tm). We obtained the phase diagrams (Tc vs η) and(Tm vs η) to obtain the region where orders, i.e., superconductivity and AFM (antiferromagnetism), coexisted. The region under the intersection of the two merged graphs shows that superconductivity and AFM coexist in the system (SmAsO1-xFxFe).
Title Page and Table of Contents
Lynne Pierson Doti (ed.)
Essays in Economic & Business History , 2009,
Abstract: Essays in Economic & Business History 2009
Towers of Gold: How One Jewish Immigrant Named Isaias Hellman Created California. By Frances Dinkelspiel. New York: St. Martin’s Press. 2009. 376 Pages.
Lynne Pierson Doti
Essays in Economic & Business History , 2013,
Abstract:
Covers, Officers, Trustees and Awards
Lynne Pierson Doti (ed.)
Essays in Economic & Business History , 2007,
Abstract: Essays in Economic & Business History 2007
Title Page and Table of Contents
Lynne Pierson Doti (ed.)
Essays in Economic & Business History , 2008,
Abstract: Essays in Economic & Business History
Title Page and Table of Contents
Lynne Pierson Doti (ed.)
Essays in Economic & Business History , 2007,
Abstract: Essays in Economic & Business History 2007
Crowding in a traditional rural housing (Tukul) in Ethiopia
Abera Kumie
Ethiopian Journal of Health Development , 2002,
Abstract: Background: Poor housing condition is one of the major public health concerns in many developing nations due to its association with the health status. Objectives: To determine the size of traditional Tukul by altitudinal zone in rural communities. Methods: During a census enumeration 5113 rural housing units were physically assessed. Axis, radius, and wall height were measured to the nearest centimeter by trained enumerators using a tape meter. Results: The mean (SD) values of axis, radius, and wall height were found to be as 537.92cm (84.88), 329.43cm (64.81), and 236.38cm (22.65), respectively. The mean (SD) space for floor area was 35.43 (13.72)m2 and space by indoor volume was 123.42 (60.26)m3 per habitable Tukul. According to the WHO literatures for a dwelling units, about 85% of the Tukuls in a rural area are crowded and far behind to satisfy the physiological needs of a resident. Nearly 95% of housing units had only one room. Conclusions and Recommendations: The high magnitude of overcrowding in rural housing units indicates the poor living and sanitation conditions. As this predisposes to many adverse health conditions, appropriate interventions need to be done with out delay. [Ethiop.J.Health Dev. 2002;16(3):303-308]
Brief communication: Patterns of chronic complications of diabetic patients in Menelik II Hospital, Ethiopia
Abera Ejigu
Ethiopian Journal of Health Development , 2000,
Abstract: A total of 283 diabetic patients (112 type -1 and the rest Type -2) were followed between September 1996 and July 1997 at the diabetic follow-up clinic of Menelik II Hospital in Addis Ababa, Ethiopia. The subjects were studied for evidence of chronic complications of diabetes mellitus. One hundred and six patients (37.45%) were found to have chronic complications (33% of Type -1 and 16.9% of Type -2) with diabetic nephropathy showing significant difference between Type -1 and Type -2 patients (P<0.002). Retinopathy and peripheral neuropathy were seen in 31.4% and 35.2% of the subjects, respectively. Fifty nine of 106 diabetics with chronic complications were diabetics for more than 10 years. Macrovascular complications occurred in 3.4% of patients of which 1.7% had cerebrovascular accident. Over seventy five percent of patients with chronic complication had poor control of fasting blood sugar (FBS). Improvement of standard of care of diabetic patients is mandatory to have good control of blood sugar to reduce the development of chronic complications of diabetes mellitus. (Ethiopian Journal of Health Development: 2000, 14(1): 113-116)
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