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Ethiopian J. of Sciences and Sustainable Development     Open Access  
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Ethiopian Journal of Sciences and Sustainable Development
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1998-0531 - ISSN (Online) 2663-3205
Published by Adama Science and Technology University Homepage  [1 journal]
  • Application of Quality Function Development in Customer Oriented Footwear
           Development Process

    • Authors: Hailu Beyecha Deti, Habtamu Beri, Biftu Hailu, Kemal Temam
      Pages: 29 - 38
      Abstract: The main purpose of this study was to develop the house of quality in footwear development process. The study was conducted using quantitative research method. Both primary and secondary data sources were used. The primary data sources were sampled using purposive sampling method. The tools used for collecting the data were informant interview and questionnaire. The secondary data were collected from previous research outputs that are related to the application of quality function deployment in footwear development process. The collected data were analyzed using Microsoft Excel 2016 and QFD Capture Professional Edition 4.2.20. The analysis revealed that the footwear produced by Ethiopian companies fared below par in comparison to the footwear produced by Chinese and European companies in terms of customer and technical perspectives. Therefore, Ethiopian footwear manufacturing companies shall use the prioritized customer and technical requirements in order to develop customer oriented footwear.
      PubDate: 2022-01-05
      DOI: 10.20372/ejssdastu:v9.i1.2022.381
      Issue No: Vol. 9, No. 1 (2022)
       
  • Engineering Geological Investigation of Jimma Town for Engineering
           Practice

    • Authors: Mekdes Habtamu Tadele, Tola Garo Shaka, Yadeta Chemdesa Chemeda
      Pages: 39 - 53
      Abstract: Jimma is one of the major and densely populated towns in Ethiopia. It is located 348.5 km southwest of Addis Ababa. As in many towns of Ethiopia, very little is known about the soil and rock engineering properties and subsurface conditions of the town. Therefore, the present research work aimed to evaluate the geological and engineering geological condition of the town. Detailed field survey, in-situ strength test, sampling, geological mapping, and laboratory testing of samples were conducted. A total of 12 disturbed soil samples were collected from 12 test pits, which were dug manually up to 3 m depth. Geological and engineering geological maps were prepared at a scale of 1:25,000. Laboratory results revealed that the natural moisture content, liquid limit, plastic limit, plasticity index, specific gravity, and free swell of the soils range from 41.97–62.45%, 66–101%, 31–62%, 19–59%, 2.36–2.75, and 33–130% respectively. The area is dominantly covered by high plastic silt and clay soil type. Basalt, ignimbrite and tuff are the lithological rock units identified in the study area, which are classified into three major engineering geological subunits: very high Strength, high strength, and very low strength (soft) rock units. Flooding and the high swelling potential of the soils are the main geological hazards that require due consideration in the study area.
      PubDate: 2022-01-24
      DOI: 10.20372/ejssdastu:v9.i1.2022.400
      Issue No: Vol. 9, No. 1 (2022)
       
  • Evaluation and Registration of the Newly Introduced Supersonic Alfalfa
           (Medicago sativa L.) Variety in Ethiopia

    • Authors: Gezahagn Kebede, Dr. Fekede Feyissa, Dr. Solomon Mengistu, Mulisa Faji, Kedir Mohammed, Dr. Mesfin Dejene, Gezahegn Mengistu, Dr. Diriba Geleti, Dr. Getnet Assefa, Dr. Aklilu Mekasha, Mezgeb Workiye, Dr. Tekleyohannes Berhanu, Berhanu Megersa, Aman Getiso, Edao Shanku, Fromsa Ijara, Diribi Mijena, Esubalew Shitaneh, Habtie Arega
      Pages: 54 - 64
      Abstract: Alfalfa (Medicago sativa L.) is one of the most important perennial forage legume recommended for livestock feed due to its better yield and nutritional quality. So the introduced supersonic alfalfa variety was evaluated with the standard check variety (alfalfa-1086) at Holetta, Debre-Zeit, Kulumsa, Wondo-Genet, Werer, and Pawe locations aimed to assess forage biomass yield, chemical composition, and tolerance to major pests and diseases during the main cropping season of 2018 under supplementary irrigation. The result indicated that the introduced supersonic alfalfa variety gave a higher (P<0.05) plant height and dry matter yield than the standard check variety at each location and combined across locations. Moreover, the plant height and dry matter yield of alfalfa varieties varied significantly (P<0.05) across locations. The introduced supersonic alfalfa variety was consistently superior in dry matter yield than the standard check variety which implied better stability under diverse environmental conditions. However, the dry matter yield varied across locations due to the differential response of the varieties for the test locations. The introduced supersonic alfalfa variety had 12.9, 11.6, and 7.7% dry matter yield, digestible yield, and crude protein yield advantages over the standard check variety, respectively. The nutritive values of supersonic alfalfa were slightly lower in ash, crude protein, digestibility and relative feed value and higher in fiber contents than the standard check variety. Based on the overall performances, the introduced variety was verified with the same standard check variety during the main cropping season of 2020 under supplementary irrigation. Due to its better yield performance, and pest and disease reaction, the National Variety Releasing Committee approved supersonic alfalfa variety in 2021 to be cultivated in low to high altitude areas ranging from 750 to 2400 meters above sea level, which have an annual rainfall ranging from 800 to 1200 mm.
      PubDate: 2022-03-28
      DOI: 10.20372/ejssdastu:v9.i1.2022.407
      Issue No: Vol. 9, No. 1 (2022)
       
  • Yield dynamics and nutrient composition of Napier grass (Pennisetum
           purpureum) varieties under consecutive harvests

    • Authors: Tessema Tesfaye Atumo, Getachew Gudero Mengesha, Milkias Fanta Heliso, Getinet Kebede Kalsa
      Pages: 1 - 9
      Abstract: Negative feed balance in terms of dry matter and forage quality has been affecting animal production in Ethiopian livestock system. Yield dynamics and forage quality assessment of ten Napier grass (Pennisetum purpureum Schumach.) genotypes to assess the yield and nutritional quality of the grass was conducted in the field of Chano Mille Research substation from September 2018 to November 2019. The experiment was laid out in randomized complete block design with three replications. All growth parameters showed significant (P<0.01) variation among genotypes that were contributing either to yield or quality. Depending on the weather condition of growing months, dry matter yield was varied among genotypes and harvesting months significantly (P<0.01). Dry matter yield varied from 4.87 to 17.35 t/ha for weather variation in growing months and from 9.57 to 18.4 t/ha for genotype variation. Leaf to stem ratio was not varied significantly among genotypes. Stem and leaf quality variation among genotypes for calcium, phosphorus and crude protein was significant while not for neutral and acid detergent fibers.  Zehone_02 and ILRI_16835 genotypes could be of optimum dry matter yield and quality to be used as a feed option in a study area and similar agro-ecological zones. Assessing silage and hay quality and animal preference warranted with the production of the crop under irrigated condition
      PubDate: 2021-10-13
      DOI: 10.20372/ejssdastu:v9.i1.2022.379
      Issue No: Vol. 9, No. 1 (2021)
       
  • Indigenous Knowledge vis-à-vis Development: The Potential of Gadaa System
           in Industrial Leadership Development

    • Authors: Hailu Beyecha Deti, Kassaye Gutema Jebessa
      Pages: 10 - 18
      Abstract: The main purpose of this study was to scrutinize techniques in Gadaa system that helped to sustain leadership development of the Oromo Society and its implication for industrial leadership development. The study was conducted using qualitative research method and exploratory research design. Accordingly, data of leadership development practices in the Gadaa system were gathered from key informants through focus group discussion, key informant interviews and non-participant observation. The data were analyzed thematically. The study revealed that there were different strategies within the Gadaa system that helped to nurture the leaders perpetually so that they can manage the society and their resources properly. Gadaa system has got different leadership development techniques such as traditional education, training, experience sharing, observation, practicing and creating a sense of competition among individuals. The Gadaa system encompasses different institutions such as centers, parties, grades and structures of Gadaa system that enabled the society to deal with various challenges, ensure good governance and enhance efficiency in management. Moreover, the study revealed that the Gadaa system has got check and balance system that is undertaken in both the forward and backward directions. Thus, the researchers would like to suggest that the proposed technique of Gadaa system could have a bearing on the improvement of work environment and thus it could potentially be used in tandem with modern day industrial leadership development techniques. Therefore, the government and concerned stakeholders should customize the important technique of Gadaa system with regard to industrial leadership development for ensuring good governance and shaping the behavior of workforce in carrying out their roles and responsibilities properly.
      PubDate: 2021-12-08
      DOI: 10.20372/ejssdastu:v9.i1.2022.384
      Issue No: Vol. 9, No. 1 (2021)
       
  • Modelling and Simulation of Hydraulic System to Measure Soil Compaction
           for Agricultural Field

    • Authors: Yared Seifu Woldeyohannis, Someshakher S. Hiremath, Simie Tola, Amana Wako
      Pages: 19 - 28
      Abstract: Soil compaction is one of the negative factors associated in the top layer of the soil by heavy agricultural machinery in the agricultural field that limits ploughing tool movement, plant growth and crop yield. Soil compaction has been conventionally measured by using a manual operated cone penetrometer which has certain ergonomically restriction tackled by the operator, it takes more time and difficult to obtain compaction data. The study aimed to design and develop a hydraulic system to measure soil compaction for agricultural field, to simulate soil compaction measuring system using MATLAB Simulink 2018 and to analyze the simulation output. The modelling and simulation include the hydraulic system used for actuate the compaction measuring cone penetrometer by considering the vertical force coming from double acting hydraulic cylinder as variable mass and the soil as a stiffness and damping property. From the simulation output, the hydraulic performance based on soil compaction measurement with the parameters such as hydraulic pressure as cone index, depth of operation, hydraulic torque, and power were analyzed. The time required for the cylinder extension to insert the cone penetrometer to the soil was 3.3 seconds with the maximum speed of cylinder extension of 0.3 mm/s. The maximum downward penetration resistance was 0.3 N. The pressure varies from 24 Pa to 38 Pa during extension of the cylinder and 0 to 15 Pa during retraction with the maximum flow rate of 3.8  10-6 m3/s. The relationship between hydraulic power and flow rate is directly proportional. Hydraulic torque and flow rate have inversely proportional relationship.
      PubDate: 2021-12-27
      DOI: 10.20372/ejssdastu:v9.i1.2022.391
      Issue No: Vol. 9, No. 1 (2021)
       
 
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