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Journal of the Operations Research Society of China 2022年第4期10卷 749-762页

作者： Diriba Kajela Geleta Mukhdeep Singh Manshahia Department of Mathematics Punjabi UniversityPatialaPunjab147002India Department of Mathematics Madda Walabu UniversityBale Robe4540OromiaEthiopia

In this paper,a hybrid of grey wolf optimization(GWO)and genetic algorithm(GA)has been implemented to minimize the annual cost of hybrid of wind and solar renewable energy *** was named as hybrid of grey wolf optimization and genetic algorithm(HGWOGA).HGWOGA was applied to this hybrid problem through three ***,the balance between the exploration and the exploitation process was done by grey wolf optimizer ***,we divided the population into subpopulation and used the arithmetical crossover operator to utilize the dimension reduction and the population partitioning *** last,mutation operator was applied in the whole population in order to refrain from the premature convergence and trapping in local *** code was designed to implement the proposed *** result of this algorithm is compared with the results of iteration method,GWO,GA,artificial bee colony(ABC)and particle swarm optimization(PSO)*** results obtained by this algorithm are better when compared with those mentioned in the text.

关键词： Hybrid renewable energy Optimization Nature-inspired algorithm Grey wolf optimization Genetic algorithm

Computational method for singularly perturbed delay differential equations of the reaction-diffusion type with negative shift

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Journal of Ocean Engineering and Science 2021年第3期6卷 285-291页

作者： Gashu Gadisa Kiltu Gemechis File Duressa Tesfaye Aga Bullo Department of Mathematics Madda Walabu UniversityP.O.Box 247Bale RobeEthiopia Department of Mathematics Jimma UniversityP.O.Box 378JimmaEthiopia

A numerical method for solving singularly perturbed delay differential equations with a layer or oscillatory behavior for which a small shift is introduced in the reaction term is *** stability and convergence of the method have been *** demonstrate the efficiency of the method,two model examples have been *** results obtained by the present scheme described that the finding of the present method is accurate than the findings of the previous studies.

关键词： Singularly perturbed Delay differential equations Convergence El Niño model

Assessment of the Trend, Cause and Effect of Deforestation Using GIS and Remote Sensing in Goba District, Bale Zone, South Eastern Ethiopia

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Agricultural Sciences 2019年第4期10卷 546-566页

作者： Getachew Legesse Hussein Hayicho Mersha Alemu Department of Environmental Science Madda Walabu University Robe Ethiopia Department of Geography and Environmental Studies Madda Walabu University Robe Ethiopia

The conversion of forested areas to non-forest land was a series problem in study area of Goba district. The objectives of this study were to assess the trends, causes and effects of deforestation in Goba district, Bale zone, Ethiopia. Descriptive research method was employed to achieve these stated objectives. Satellite image of the three times and socio-economic survey were the main data sources for this study. ERDAS imagine 9.2 and ArcGIS 10 tools were applied for land use and land cover type classification, and analysis and mapping. These land use land and over change data were obtained from USGS. Socio-economic data collected through questionnaires, focus group discussions and interviews on the causes and impacts of land use and land cover change were analyzed quantitatively using SPSS software and content analysis for qualitative data. These analyzed data were expressed in percent and in words. The result shows that there was variation in the extent of land use and land cover change among different categories/classes at different study periods. Open area and Bush land showed decreasing change during first period of comparison and increasing change in the second period of comparison. In contrast, agricultural area, Bale temperate vegetation and built up area showed increasing. Built up area, agricultural area and Bale temperate vegetation increased by 80.05, 15.84, and 7.40 percent respectively, however, open area, grassland, forest land and bush land decreased by 1.58, 1.21, 0.97, and 0.28 percent per year for the last 29 years respectively. In general, in study district forest cover was 50.87% of the total area in 1986 and decreased to 36.57% in 2015 whereas agricultural area was increased from 3.45% to 19.28% respectively. This implies an increasing agricultural area at the expense of other land use cover categories, particularly natural forest. The study indicated that increasing population, forest fire and fuel wood consumption, overgrazing, and agricultur

关键词： Deforestation Remote Sensing GIS Land Use and Land Cover Goba District

Assessment of Land-Use and Land Cover Change Effect on Melka Wakena Hydropower Dam in Melka Wakena Catchment of Sub-Upper Wabe-Shebelle Watershed, South Eastern Ethiopia

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Agricultural Sciences 2019年第6期10卷 819-840页

作者： Hussein Hayicho Mersha Alemu Haji Kedir Department of Geography and Environmental Studies Madda Walabu University Bale Robe Ethiopia

Land degradation and sedimentation has been increasingly a crucial problem in upper Wabe-Shebele catchment, south eastern Ethiopia over the last two decades. Nevertheless, so far no detail research has been conducted to assess such problem. Therefore, the present study was conducted at Melka Wakena Catchment of Upper Wabe Shebelle Watershed to identify the trends of land use and land cover change and its effects on hydrology and land degradation. To achieve the objectives of the study different data sources such as satellite images, climate and rivers gage data;soil sample data were collected and analyzed using relevant corresponding up to dated software. Based on pre-defined criterion, available satellite images for the years 1986, 2011, and 2015 were analyzed using ERDAS, ENVI and ArcGIS softwares. The study catchment stream flow and soil erosion information were computed using SWAT model. MUSLE was employed to assess the amount of sediment yields and rate of soil loss existed in the study area. The study showed that significant land use and land cover changes were recorded during the past nearly three decades. This change has been directly affecting the hydrology and sedimentation of the catchment. The annual surface runoff varied between 45.65 mm and 332.29 mm. The amount of surface runoff was generally increased from 1990 to 2010, whereas decreased until 2013 before beginning the increasing trend. The result of the sediment yield analysis showed that there was a general increasing trend from 1992 to 2010 and then declined up to 2013 before it started the rising trend. From the simulated results, it was observed that the long-term mean soil loss was 20.22 t/ha. Sustainable integrated watershed management practices should be practically implemented throughout the landscape of the catchment from upper to down streams. Above all, dam buffer area needs to be demarcated and protected from the current settlement: cultivation and over grazing.

关键词： Land Use/Land Cover Soil Erosion Sedimentation Melka Wakena Ethiopia

Assessing the Effects of Land-Use and Land Cover Change and Topography on Soil Fertility in Melka Wakena Catchment of Sub-Upper Wabe-Shebelle Watershed, South Eastern Ethiopia

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Journal of Environmental Protection 2019年第5期10卷 672-693页

作者： Hussein Hayicho Mersha Alemu Haji Kedir Department of Geography and Environmental Studies Madda Walabu University Bale Robe Ethiopia

This study was conducted in Melka Wakena catchment;south eastern Ethiopia to assess land use/cover change (LULCC) and topographic elevation effect on selected soil quality/fertility parameters. 144 soil samples collected from 0 - 30 cm depth under three land cover types across three elevation gradients were analysed for selected soil quality/fertility parameters. Data were statistically analyzed using analysis of variance (ANOVA) and mean comparisons were made using Least Significant Difference (LSD). The soil properties examined generally showed significant variations with respect to land-use/land cover changes and elevation. Soil particles, soil organic carbon, total N, pH, available phosphorus, potassium and calcium content significantly decreased as forestland is converted into cropland/grassland. Heaviest soil deterioration was recorded in soils under cropland and followed by grassland soils. The conversion of natural forest to different land uses without proper soil conservation and management practices resulted in the overall decline of soil fertility quality. Thus, integrated land resource management approach is indispensable for sustaining agricultural productivity and the environmental health of the Melka Waken a catchment.

关键词： Land Use/Cover Resource Management Soil Quality Spatial Variation Topographic Elevation Soil Quality Parameters

Effect of Maize/Haricot Bean Intercropping on Soil Fertility Improvement under Different Tied Ridges and Planting Methods, Southeast Ethiopia

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Journal of Geoscience and Environment Protection 2017年第8期5卷 63-70页

作者： Siraj Beshir Jemal Abdulkerim Department of Natural Resource Management College of Agriculture and Natural Resources Madda Walabu University Bale Robe Ethiopia Plant Science College of Agriculture and Natural Resources Madda Walabu University Bale Robe Ethiopia

Mono cropping is the dominant factor influencing plant nutrient uptake and loss of soil quality in Ethiopia whereas intercropping of cereal/legume has positive environmental qualities. Likewise drought and moisture stress condition is widely expanding from all direction to the center of the country. Therefore, the objective of this research was to evaluate influence of planting methods, tied ridge and cropping system on different soil chemical properties in case of madda walabu district, Southeast Ethiopia. It was undertaken at Bidire from March 2016 to January, 2017. In this experiment, one maize variety (Melkassa 2) and one haricot bean variety (Nasir) were used. Treatments include open end and closed end tied ridge;sole cropping and intercropping;and in furrow, on ridge and flat bed planting. Each treatment has been triplicate and the experiment plots were laid out in randomized complete block design. Intercropping of maize-haricot bean with tied ridge and planting methods were highly influenced soil pH, exchangeable potassium, available phosphorous, soil organic matter and total soil nitrogen. Generally, the use of intercropping and closed end tied ridge in combination with in furrow planting significantly increased (p0.05) soil fertility in the system, which could be promising for sustainable improvement of crop production and productivity for semi arid areas of Bale zone.

关键词： Tied Ridge Intercropping Planting Methods

Land Use Land Cover Change Detection and Deforestation Modeling: In Delomena District of Bale Zone, Ethiopia

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Journal of Environmental Protection 2019年第4期10卷 532-561页

作者： Girma Ayele Hussein Hayicho Mersha Alemu Farm Africa Addis Ababa Ethiopia Department of Geography and Environmental Studies Madda Walabu University Bale Robe Ethiopia

Previous studies in Delo-Mena district failed to provide conceptual framework about causes and impacts of deforestation including prediction of spatial location of future deforestation. The study was aimed at investigating spatiotemporal dynamics and prediction of future trends of deforestation in this area. Three periods Landsat images were downloaded and preprocessed using ENVI 4.3. Supervised classification technique was employed for image classification. Land Change Modular used to predict deforestation based on transition between 2000 and 2015 along three driving variables (road distance, settlement and soil). Six land-use land-cover classes were classified for three periods. The result indicated that the forest areas were 91,339, 73,274 and 70,481 hectors in year 2000, 2010 and 2015, respectively. This forest area was reduced by 20% between 2000 and 2010 at annual rate of 2%. Between 2010 and 2015, a forest area was lost by 4% with annual rate of 1%. This deforestation rate was greater than global rates and was lower than rates of south eastern African countries. Farmland expansion was a major cause of deforestation contributed to the annual forest loss by 4.9% and 36% over different periods. In 2030, about 33,243 hectors of a forest area would be expected to disappear that implied emission of about 17 million ton of carbon dioxide. Fuelwoods shortage and loss of biodiversity were perceived as impacts of deforestation. Farm-land and settlement were found increasing at expense of vegetation. Forest plantation, supply of fuel efficient technology and community mobilization were recommended that would be emphasized by the forestry sector based at the district office.

关键词： Deforestation LULC Modeling Transitions Land Change Modular

Review on Estimation of Crop Water Requirement, Irrigation Frequency and Water Use Efficiency of Cabbage Production

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Journal of Geoscience and Environment Protection 2017年第7期5卷 59-69页

作者： Siraj Beshir Department of Natural Resource Management College of Agriculture and Natural Resources Madda Walabu Univeraity Bale Robe Ethiopia

Water is the major limiting factor for crop production. A lot of water resources have been exploited for irrigation purpose. Therefore, the objective of this review paper was to collect information on cabbage water requirement, irrigation scheduling and water use efficiency by triangulating different literatures on the topic. Nowadays on worldwide there is a water-shortage, accordingly it is necessary to adopt water saving agriculture as a counter measure as well as efficient use of irrigation water is becoming increasingly important. In growing crop, irrigation scheduling is a critical management input to ensure optimum soil moisture status for proper plant growth and development as well as for optimum yield, water use efficiency and economic benefits. Thus according reviewed literatures on average twice a week irrigation scheduling and 2.57 - 5.81 mm/day of crop water requirement is more visible for cabbage production. In addition, climate models were reviewed in detail in this paper CROPWAT 8.0 and DSSAT reproduce acceptably the unimodal and bimodal shapes of the annual variation of rainfall and temperature respectively;there is a time shift between the observed and simulated peaks. Therefore it is essential to develop irrigation scheduling strategies under local climatic conditions to utilize scarce water resources efficiently and effectively for crop production.

关键词： Water Use Efficiency Scheduling Water Requirement Climate Model

Sero Status Disclosure to Sexual Partner and Associated Factors among Adult HIV Positive Patients in Bale Zone Hospitals, Oromia Region, Ethiopia: Institution Based Cross-Sectional Study

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Open Journal of Epidemiology 2018年第2期8卷 43-53页

作者： Tsige Defere Geremew Rameto Aman Nuri Jeylan Kassim Esmael Bale Zone Goba Town Health Office Bale Goba Ethiopia Department of Public Health Goba Referral Hospital Madda Walabu University Bale Goba Ethiopia

Background: Disclosure of HIV sero status is among varies HIV prevention strategy to prevent the spread of HIV. It is the base for accessing care and treatment programs, attains psycho-social support and reduces stigma, adheres to treatment and promotes safer health behavior particularly for couples. Objective: To assess HIV sero status disclosure to sexual partner and associated factors among HIV positive adult patient in Bale Zone hospitals. Method: A cross-sectional study design was conducted among 411 adult HIV positive clients who were selected by using systematic random sampling methods from Bale Zone Hospitals. Data were collected by using pre-tested questionnaire after verbal consent obtained from participants by trained nurse. Multiple logistic regression analysis was done by using SPSS version 20 and P-value of less than 0.05 was taken to declare statistical significance. Result: HIV sero status disclosure to sexual partners was 52.6%. Residence (AOR = 1.62;95% CI, 1.0, 2.60), receiving pre-test counselling related disclosure (AOR = 6.25;95% CI, 3.45, 11.33) and knowledge of partner’s HIV sero status (P-Value = 0.001) were significantly associated with HIV sero status disclosure. Fear of stigma and violence by sexual partner were the main reasons suggested for not disclosing HIV sero-status. Conclusion: The level of HIV sero-status disclosure to sexual partner was low. Disclosure of HIV sero status to sexual partner was significantly associated with clients’ place of residence, receiving pre-test counselling about disclosure and Knowledge of partners HIV sero status.

关键词： HIV Sero Status Disclosure Sexual Partner Adult Clients

Assessment of Diarrheal Disease Management Practice in Under-Five-Year Children According to WHO Guideline in Health Facilities of Hawassa City, SNNPR, Ethiopia

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Health 2020年第10期12卷 1345-1359页

作者： Usman Abdurehman Huluka Ahmed Hasan Dessiso College of Medicine Hawassa University Hawassa Ethiopia Faya General Hospital Shashamane Ethiopia Departments of Statistics College of Natural and Computational Science Madda Walabu University Bale Robe Ethiopia

Objective: To explore the practice of management of diarrhea in under-5-year children at health facilities found in Hawassa town, and associated factors with malpractice in comparison. Methodology: Cross Sectional study was conducted in 2 hospitals, 2 health centers and 2 private clinics that are found in Hawassa city which is found in Southern Nations, Nationalities and peoples (SNNP), 275 KM to south from Addis Ababa, capital city of Ethiopia from august 2017-October 2017. Structured checklist was used to retrieve the required information from the patients on arrival and stay in pediatrics OPDs and wards. The data analysis carried out using SPSS version 20.0. Logistic regression was carried out to analyze the association between the independent and dependent variables. Statistically significant associations were declared at p-values of less than or equal to 0.05. Results: Out of 420, about 397 (94.5%) children with diarrheal disease between the ages of 3 - 59 months were studied. The study subjects were from governmental hospitals (35.5%), health centers (34.5%) and private clinics (30%) that are found in Hawassa City. Sign of dehydration was 66 (17%) of which majority 59 (83%) of them were rehydrated. As to Zink supplementation, only 180 (45%) received it;antibiotics were the commonly (59.1%) prescribed drugs. Only 43.3% of children were appropriately managed. Hospitals had higher odds of inappropriate management of diarrhea with AOR = 1.61 (95% CI: 1.04 - 2.5) and children one year or younger were more inappropriately managed for diarrhea at the health facilities with AOR of 2.3 (95% CI: 1.57 - 4.41). Conclusions: In the current study the management of diarrhea at the health facilities is unsatisfactory as only less than half of children with diarrhea were properly managed. Treatment of diarrhea at hospital level and the patient’s age being less than 1 year were found to significantly a

关键词： Antimicrobial Diarrhea Management Malpractice ORS Under-Five Children Zink Supplementation