Satellite Remote Sensing and GIS based Watershed Analysis: Implications for Soil and Water Conservation Practices in the Denkyira Watershed, Ghana

Land degradation, deforestation and accelerated soil erosion through anthropogenic actions have restricted numerous watersheds and river basins to contribute to agricultural productivity, food security and economic growth. The study examined morphometric characteristics and land use change and their implications for soil and water conservation practices in Denkyira Watershed, Ghana. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data and Landsat images of Multi-Spectral Scanner (MSS) and Enhanced Thematic Mapper Plus (ETM+) were used in generating morphometric and land use data. ERDAS imagine (10.1) and ArcGIS (10.6) software were employed to analyze Landsat and ASTER data. Results revealed that Denkyira Watershed exhibited dendritic drainage pattern, elongated in shape and with high number of first-order streams, an indication of homogenous soil and rock formation, low infiltration rate and high surface runoff. Morphometric analysis further indicated that the Watershed has higher values of drainage density (12.82 km/km2), drainage texture (5.15), infiltration number (5.13) and ruggedness number (5.16) exposing the Watershed to peak discharge and flash flood risks.  Between 1986 and 2015, natural forest, secondary forest and water bodies decreased by 26.08 %, 13.67 % and 237.50 % respectively while degraded lands increased by 91.33 %. Land use and land cover changes in the watershed have triggered mechanical soil erosion and altered hydraulic stream characteristics. Installation of check dams, creation of earth bunds, construction of water absorbing terraces and trenches and valley bottom cropping are the most recommended restoration measures for the watershed. The study concludes that investment in soil and water conservation practices in the watersheds will help to reduce the erosive velocity of surface runoff, mitigate seasonal flooding risks and reclaim degraded farmlands while ensuring agricultural productivity and environmental sustainability

Influence of Stocks Intrinsic Valuation on Investment Decision Making: A Literature Review

All over the world, investment decisions are regarded as critical decisions. Investors prior to the investment decision would like to know the possible risk and returns associated with the kind of investment to be undertaken. Investors make an excellent investment decision based on facts and figures. Since an investor cannot just by looking at a stock say whether it is overvalued, undervalued or at a fair value. This study is based on a literature review determining the intrinsic value of a stock using the Discounted Cash Flow model, with a particular emphasis on the Internal Rate of Return (IRR) and Net Present Value (NPV) approaches, and their influence on investment decision-making. This study recommends that for investors to make a profitable investment decision, they must focus on investments with intrinsic value equal or higher than the market price of stocks

Influence of Heuristic Techniques and Biases in Investment Decision-Making: A Conceptual Analysis and Directions for Future Research

Purpose: The primary purpose of the study was to examine the roles of heuristic techniques and cognitive biases in Investment decision making and suggest directions for future research. Design/Methodology/Approach: The study adopted the literature review method to solicit an understanding of the heuristics and biases central to behavioural finance and influence investment decision-making. Findings: The paper provides conceptual insights into the influence of heuristic techniques and cognitive biases in investment decision-making. Results from the conceptual analysis show that in recent times, investors in their bid to minimise losses and maximize gains employ a range of heuristics which often lead to systematic errors in judgment. Practical Implications: The paper encourages investors to prioritise financial literacy as a prerequisite to making investment decisions in the capital market and minimise the overreliance on heuristic techniques which often lead to biases. Originality/Value: The current study is the first to focus on the influence of both heuristic techniques and cognitive biases in investment decision-making together with suggested future research directions. This article enhances understanding of the behavioural finance approach to investment decision-making

Empirical Similarity-Based Approach for Selection of Unit Root Test

The existence of unit roots in time series processes can impair the choice of techniques for analysis and forecasting time series data. It is of much importance in econometric modelling to determine the integration number of analyzed time series based on unit root tests. Though statistical theory provides broad range of unit root tests in standard softwares, the choice of an appropriate test highly depends on subjective assessment of the analyst. This paper considers similarity-based scoring approach for selecting the most appropriate unit root test for specific type of time series observations based on Chi-square statistic and which is able to reduce subjectivity. Six unit root tests are studied. The utility of the proposed method is illustrated in simulation. The most reliable test, which is found is applied to a real time series of some selected macroeconomic variables. Keywords: Time series, Stationarity, Unit root, Integration order, Chi square statisti

Costs of reproductive health services provided by four Christian Health Association of Ghana (CHAG) hospitals

The Christian Health Association of Ghana (CHAG) is a large faith-based NGO which currently serves an estimated 35 percent of the Ghanaian population, mainly in remote rural areas. This study built capacity within the CHAG secretariat to calculate the economic cost and cost recovery levels of selected reproductive health services in four CHAG-affiliated hospitals. Techniques learned in the study are applicable to most costing problems, not just to reproductive health. Information obtained in the study forms the basis for negotiating reimbursement under the Ghana National Health Insurance Scheme, and for setting cost recovery and containment policies. CHAG senior managers plan to train other association hospitals in the technique

Patterns of Land Use Activities in Ghana’s Secondary Cities

Ghana is rapidly urbanizing. This urbanization has resulted in villages growing into towns and towns into urbanized areas. Theories and models have been employed to explain the internal structure of urban areas, especially, with respect to land use variations. These models started with the classical urban land use models in America. Urban scholars in Africa have struggled to fit the development of the African cities into these classical models. They have therefore called for African scholars to develop models for urban land use in Africa. This paper sought to identify the common patterns of land use activities which shape the internal structure of Ghana’s secondary cities. The study employed Geographic Information System (GIS) as a major tool of analysis in explaining the patterns in urban areas. This is augmented with in-depth ground observations of the study areas. The findings of the study showed the absence of homogeneity in most of the sectors and undefined industrial zones as contradictions to the classical models. The study further revealed that residential zones were not fully occupied by either lower income, middle income, or higher income residence. The income groups may only dominate in a given sector. Based on the findings, a common pattern is proposed to represent the land uses within the selected secondary cities in Ghana

Assessment of past and future land use/cover change over Tordzie watershed in Ghana

Land use/ land cover (LULC) change has been identified as the main driving force of global change. The study investigated LULC change in Tordzie watershed in Ghana and predicted the future development. The supervised classification procedure was applied to Landsat images of 1987, 2003, and 2017. The cellular automata–Markov model embedded in IDRISI 17 software was employed to model LULC for the years 2030 and 2050. The trend of LULC change was exploited from 1987 to 2003, from 2003 to 2017, and projected to 2030 and 2050. Settlement and crop land, respectively, increased from 2.68% to 16.46% in 1987 to 3.65% and 53.47% in 2003 and finally to 20.61% and 58.52% in 2017. Vegetation cover declined from 23.2% in 1987 to 13.9% in 2003 and finally to 11.3% in 2017. The annual rate of change was determined. In 2030 and 2050, the dominant land use type will be crop land (56%). However, it decreased between 2017 and 2030 by −1.73%. The findings of the study are very relevant to land and water resource planners, policy formulators and implementers, and environmental and climate change advocates. Sustainable land use policy and its implementation are recommended

PHYSICO-MECHANICAL PROPERTIES OF BAUXITE RESIDUE-CLAY BRICKS

ABSTRACT This study is focused on consolidating knowledge on the application of Bauxite residue in the building industry. X-Ray fluorescence (XRF) reports of the bauxite and bauxite residue are given. Physico-mechanical properties of red mud (RM)-Clay (AC) bricks are also presented. The RM-AC bricks have compositions; 90%-10%, 80%-20%, 70%-30%, 60%-40%, 50%-50%, 40%-60% prepared and fired at sintering temperatures 800 o C, 900 o C and 1100 o C. The experimental results obtained showed that at each of the three stated sintering temperatures, bulk density increases as apparent porosity and water of absorption reduces. Bulk densities computed were within the range (1.3-1.8)g/cm 3 at 1100 o C sintering temperature. Maximum flexural strength was found to be associated with 50%-50% (Red mud-clay) composition at 1100 o C. And the compressive strength (3.2-12.5) MPa range found for all batches at 1100 o C sintering temperature. Generally, flexural and compressive strengths were increased with higher sintering temperature. The results obtained for various characterization analysis compares well with literature and hold potential in bauxite residue eco-friendly application as fired brick

Clinical characteristics of COVID-19 patients admitted at the Korle-Bu Teaching Hospital, Accra, Ghana

Design: Study design was a retrospective single-center review of hospital data.Setting: The study was conducted at the COVID-19 Treatment Center of the Department of Medicine and Therapeutics of the Korle-Bu Teaching hospital in Accra, Ghana.Participants and study tools: A total of fifty patients with laboratory (rRT-PCR) confirmed COVID-19 infection were involved in the study. A chart review of the medical records of the patients was conducted and the data obtained was documented using a data extraction form.Results: The median age was 53 years and most (36% (18/50)) of the patients were at least 60 years of age. Eighty percent (40/50) of the patients were symptomatic, with cough and difficulty in breathing being the commonest presenting symptoms. The mean duration of hospitalization was 12.3 ± 7.3 days. Hypertension and Diabetes Mellitus were the commonest co-morbidities occurring in 52% (26/50) and 42% (21/50) of patients respectively. Fifty percent of patients developed COVID-19 pneumonia as a complication. The mortality rate was 12% (6/50).Conclusion: In this study, SARS-CoV2 infection affected older adults with hypertension and diabetes mellitus being the common comorbidities. Patients with these comorbid conditions should be counselled by their clinicians to strictly observe the COVID-19 prevention protocols to reduce their risk of acquiring the infection. There is a need to pay critical and prompt attention to the management of patients with COVID-19 pneumonia particularly among people with diabetes to improve outcomes

Comparative analyses of the mechanical and microstructural properties of the weld region of LPG cylinder materials

This paper presents the numerical and experimental results of the mechanical and microstructural properties of liquefied petroleum gas cylinders from local sources. The tensile strength, burst and fracture toughness of the materials were also investigated. The results show that the carbon content for all samples averaged ~0.22 wt% and manganese ~0.76 wt% and the microstructure was largely pearlitic. The tensile strength showed that LPG-C3 recorded high tensile strength of ~ 611 MPa and hardness of ~ 200 HV while LPG-C5 recorded low tensile strength of ~ 450 MPa. The finite element analysis (FEA) showed fracture toughness of ,5 105MPa.mm0.5 for LPG-C2 and the energy release rate of ~2 106J/m2 for LPG-C5. All samples exhibited high resilience to crack propagation which showed ductile fracture after tensile test. The implications of the results are discussed to elaborate on the influence of carefully controlling the alloying elements of LPG cylinder materials on their mechanical and microstructures during fabrication.The African Research Universities Alliance Early Career Fellowship (ARUA-ECRF), the University of Ghana BANGA-Africa Program, and the TWAS-DFG Fellowship.https://www.tandfonline.com/loi/oaen20am2024Materials Science and Metallurgical EngineeringSDG-09: Industry, innovation and infrastructur