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Determination of Potential Landfill Site in Tarkwa Area Using Multi-Criteria GIS, Geophysical and Geotechnical Evaluation  [PDF]
Asare Asante-Annor, Samuel Asare Konadu, Ebenezer Ansah
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.610001
Abstract: A 24-acre land at Aboso serves as the site where municipal solid waste from Tarkwa and its environs are openly dumped. Evaluation of the suitability of this existing landfill site for the construction of an engineered landfill was determined. Reconnaissance survey, structural mapping, determination of depth to groundwater, geotechnical site investigation as well as socio-economic indicators showed that the existing landfill site is not suitable for an engineered landfill construction. A multi-criteria GIS model was used to select an alternative suitable area for the construction of an engineered landfill. The multicriteria GIS modelling identified fourteen (14) suitable areas for the siting of landfill in the Tarkwa area. A site located in Domeabra was chosen due to its proximity to the neighbouring communities of Tarkwa, Nsuta and Aboso. The suitability of the proposed site in Domeabra was assessed using geotechnical and geophysical methods. The geotechnical methods included the testing of soil properties such as moisture content, particle size distribution, Atterberg limit, bulk density, specific gravity, and compactibility. The soils at Domeabra site are predominantly gravel and sand, well graded with gradual increase in clay content with depth and good moisture content (less than 30%). The gravel and sandy soils have good to excellent shear strength and work ability. The soils in Domeabra have suitable dry density (1.3 - 2.1 Mg/m3), bulk density (1.7 - 2.5 Mg/m3) and specific gravity (2.2 - 2.9) for landfill construction. The geophysical method involved the use of seismic refraction tomography. The geophysical survey showed that the site is made up of four layers namely the top soil (0.5 - 2 m), weathered material (5 - 15 m), saturated material (10 - 15 m) and fresh rock. The water table occurs at a depth of 12 to 15 m. The proposed area in Domeabra based on the geophysical and geotechnical investigations is suitable for the construction of engineered landfill.
Hydrogeological and Hydrochemical Assessment of Basin Granitoids in Assin and Breman Districts of Ghana  [PDF]
Asare Asante- Annor, Joseph Acquah, Ebenezer Ansah
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.69004
Abstract: Hydrogeological and hydrochemical assessments were carried out in Assin and Breman districts of Ghana. A multi-criteria approach was used in the assessment of the basin granitoids including; electrical resistivity survey, pumping test and water quality analysis. A total of twenty-five (25) representative boreholes were drilled, developed and pumped; obtaining data for aquifer hydraulic parameters estimation. Correlation analysis was used to determine relationships that exist between aquifer hydraulic parameters. Schoeller, Piper, Stiff plot and Gibbs diagrams were used to determine the hydrogeochemical facies, water types and the mechanism that control groundwater quality. The statistical analysis determined that aquifer hydraulic parameters discharge rate (Q), hydraulic conductivity (K) and Transmissivity (T) showed a strong positive correlation with specific capacity (Q/Sw) with R value 0.8462, 0.8738 and 0.8332 respectively. The K and T were respectively between 0.02 - 0.90 m/day and 0.36 - 13.47 m2/day with mean of 0.24 m/day and 3.03 m2/day respectively. The K values indicate a hydrogeological condition of aquiclude with relatively low permeability and medium water bearing capacity. The aquifer T magnitude is very low to low, groundwater potential is adequate for local water supply with limited and private consumption. All physicochemical parameters were within the permissible limits of Ghana Standards Authority (GSA) and World Health Organisation (WHO) except for apparent colour, pH, Fe and Mn. Distribution of major ions in groundwater samples was calculated and the general trend among cations and anions was found to be Ca2+ > Na+ > Mg2+ and Cl > HCO3 > SO42 respectively. The study area shows five main water types namely; Ca-HCO3, Na-Mg-HCO3-SO4, Ca-SO4, Na-Cl and Mg-Na-Cl. Weathering of rock-forming minerals as the mechanism controlling the groundwater chemistry. Microbiological parameters were above the permissible limits. Groundwater is suitable for drinking after treatment with chlorination, aeration and slow sand filtration methods.
Changes in the chemistry of the Weija Dam Reservoir in Ghana, twenty years after impoundment
OD Ansa-Asare, KA Asante
West African Journal of Applied Ecology , 2005,
Abstract: The studies of the changes in Weija lake waters after 20 years of impoundment, were aimed at examining the status in the chemical characteristics of the Weija lake, by analysing available data collected over a 5-year period (1993–1997), and comparing them with the first 5 years of impoundment between 1977 and 1982. The study showed supersaturated dissolved oxygen concentrations, indicating the lake waters had recovered from the initial low oxygen saturation during the first few years of impoundment. The lake waters had high oxygen demand from the high phytoplankton levels and organic matter in the dry season. Chlorophyll ‘a’, which is an indication of algal biomass content, correlated with total inorganic carbon (alkalinity), giving a correlation coefficient of 0.61 at 95% confidence limit, reflecting the fact that both parameters decreased in the rainy season, and were higher in the dry season. The initial high concentration of nutrients also decreased after 20 years with the exception of nitrate, which concentration increased at the rate of 1.07 mg l-1 year –1 over the last 5 years, a condition that could mainly be attributed to nitrogen input from domestic and agricultural origin. The high seasonal trend of nitrate in the months of March and May was due to the fact that the period is the main farming season in the Weija catchment area when most fertilizers are applied. With respect to the major ions, slight increases in their concentrations occurred. Ionic concentration patterns were found to be Na > Ca > Mg > K and HCO3 > Cl > SO4. The cationic pattern was in contrast to the previously reported pattern of Na > Mg > Ca > K, showing complete mixing of the lake waters with moderate rock weathering rate but a strong influence of maritime-derived salts.
The water quality of Birim river in South-East Ghana
O D Ansah-Asare, K A Asante
West African Journal of Applied Ecology , 2000,
Evaluation of urinary arsenic as an indicator of exposure to residents of Tarkwa, Ghana
KA Asante, T Agusa, R Kubota, A Subramanian, OD Ansa-Asare, CA Biney, S Tanabe
West African Journal of Applied Ecology , 2008,
Abstract: In Ghana, mining plays a significant role in the economic recovery programme. However, the gains are achieved at the cost of environmental and human health. For many years, the extraction of gold involved roasting which released airborne particles and large quantities of arsenic (As). Sampling for this study was conducted in March 2004 to assess the contamination status of trace elements, especially As, in water and mine workers in Tarkwa, which has nearly a century of gold mining history. Water and human urine samples were collected from Tarkwa, in addition to control samples taken from Accra, the capital of Ghana. Arsenic excretion was assessed in the first morning void urine. Concentrations of As and Mn in some water samples from Tarkwa were above the WHO drinking water guidelines. A potential health risk of As and Mn is a concern for the people consuming the contaminated water in this area. Levels of trace elements in water from control site were low compared to levels from Tarkwa. The mean urinary As concentration of 260 ìgl-1 from the study area was comparable to those in Asendemic areas of the world. This indicates relatively high degree of human exposure to As in Tarkwa, Ghana. Relatively low levels of As in water and no significant difference of As concentrations in urine between Tarkwa and Accra may suggest the presence of other sources of As contamination in Ghana, possibly food. This is the first study reporting 23 trace elements in human urine samples from a mining town in Ghana.
Emotional Intelligence as an Essential Factor for the Successful Management and Financial Administration of Projects and Programs  [PDF]
Joseph Asare
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.64038
Abstract: The ability of administrative leaders to manage their emotions, including the influence they have on the people they work with in projects and programs, influences the way the activities involved are organized, conducted, and implemented and the level of project goals that are usually achieved. The success of projects is determined by a number of factors as indicated in the International Project Management Association (IPMA) Competence Baseline [1]. When analyzed and broken into details, those factors are connected to the management and the financial administration processes throughout the project’s life cycle. Several attempts have been made by scholars to write on some of the factors that can contribute to project success. Emotional intelligence as an essential factor for the successful management and financial administration of projects and programs would be shown through the use of the emotional intelligence pyramid. Emotional intelligence would also be connected to the Projects and Programs Success Roulette Wheel where this study would develop based on the IPMA Competence Eye. Studies have shown that managers must have high emotional intelligence to enable them to achieve success in projects and programs.
Reflective Collaborative Practices: What Is the Teachers’ Thinking? A Ghana Case  [PDF]
Amoah Samuel Asare
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.34069
Abstract: With advances in using the teachers’ classroom as the foreground for teacher improvement, reflective and collaborative activities provide teachers with a positive attitude towards questioning their teaching in a variety of professional development contexts. This study therefore explores how teachers within one school develop their thinking about their practices, if given an opportunity to engage in a planned series of critical dialogues relating to their own classroom teachings. Using a case study approach, four mathematics teachers purposely and through theoretical sampling techniques were selected in a school in Ghana for the study. The field research included interviews and reflective dialogue. Key issues identified include the opportunities to systematically and rigorously diagnose their practices leading to the development of different reflective scales when reflecting. The process was found to be a tool for supporting teachers to critically think which is underpinned by social, political and cultural issues as a process to analyze competing claims and viewpoints. Recommendations for policy and potential areas for further research were also made.
Evaluation of Food Hygiene Knowledge Attitudes and Practices of Food Handlers in Food Businesses in Accra, Ghana  [PDF]
George Amponsah Annor, Ekua Anamoaba Baiden
Food and Nutrition Sciences (FNS) , 2011, DOI: 10.4236/fns.2011.28114
Abstract: Food handlers have a prime role to play in food businesses, and that is to guarantee that meals served are hygienic for consumption. Conscious or inadvertent contamination of such food places consumers at risk of suffering from food- borne illnesses. For this reason the study was carried out to document the food hygiene knowledge, attitudes and practices of some food handlers, in food businesses in Accra, Ghana and also to determine the microbiological load of the foods sold by the food businesses. The study targeted food handlers in the hotel industry. The study involved a field survey, followed by a laboratory assessment of microbiological status of food samples obtained from the sampled hotels. Cross tabulations and chi – squared tests (5% significance level) as well as frequency distributions were used to analyze the data obtained from the field survey. Data obtained from the laboratory assessment were also compared to standard values of microbiological counts. Majority of respondents were between the ages of 30 - 40 years (42.9%) with tertiary or post secondary education. Food hygiene knowledge and attitudes were satisfactory, however its practice was challenging. Gender, age and educational level of respondents did not influence their food hygiene practices. Microbial counts of all food samples was generally high ranging from 1.2 × 105 CFU/g to 1.1 × 108 CFU /g. The total coliform counts of foods ranged from 1.0 × 104 CFU/g to 5.0 × 106 CFU/g, and these were obtained from three out of the five hotel kitchens sampled. The study concluded that, the food hygiene knowledge and attitudes of the food handlers did not result in efficient food hygiene practices.
Time-Dependent Contaminant Transport in Ventilating Air from a Moving Source  [PDF]
George L. Danko, William Asante
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.85054
Abstract: A new method which combines the Eulerian, fixed control volume with a moving, Lagrangean flow channel is described for the solution of the conjugate, advection-diffusion problem for modeling transport processes of contaminant species. The transport model is presented as a conservative mass balance equation in a state-flux, species transport form in the space-time domain. A fully-implicit, general solution scheme is formulated with matrix operators in the space-time domain. The particular solutions for specific initial and boundary conditions and source term are constructed with the help of a single, inverse matrix operator, A-1, which has to be calculated only once for all possible particular problems. Although A-1 involves a large number constants, all are independent from the initial, boundary, and source term input vectors. The multi-level, state-flux, space-time (SFST) scheme brings a significant computational acceleration since A-1 has to be calculated only once, such as in mine ventilation cases involving long drifts with constant air flow velocities. Such application is shown in an example for analyzing the transport and concentration distributions of diesel particulate matter (DPM) in the ventilation air at the working area with the interactions between ventilation and a moving diesel loading machine. Comparison between simulation and in situ DPM monitoring results suggests that reliable evaluation of average exposure of DPM to mine workers may be accomplished directly from tailpipe DPM emission data, ventilation air velocity, and mine geometry with the use of the SFST model even in a highly dynamic working area, potentially reducing the need for real-time DPM monitoring.
Regime-Switching Model on Hourly Electricity Spot Price Dynamics  [PDF]
Samuel Asante Gyamerah, Philip Ngare
Journal of Mathematical Finance (JMF) , 2018, DOI: 10.4236/jmf.2018.81008
Abstract: A robust time-varying regime-switching model for price dynamics of hourly spot price of electricity on the electricity market is developed. We propose a two-state Markov Regime Switching (MRS) model that gives weight to the existence of different variance for each regime. Our model is tractable as it integrates the main features exhibited in the hourly spot price dynamics on the electricity market. The parameters of our hourly spot price of electricity market model are estimated using the Expectation Maximization algorithm. Based on this model, an efficient and tractable pricing technique can be developed to price the dynamics of the hourly spot price of electricity.
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