International Journal of Science for Global Sustainability
International Journal of Science for Global SustainabilityNot a member yet
578 research outputs found
Sort by
Unsteady Magnetohydrodynamic (Mhd) Free Convective Isothermal Vertical Plate in A Porous Medium with Radiation Effect
Get PDFUnsteady MHD free convention isothermal vertical plate in a porous medium with radiation effect has been studied numerically. Implicit finite different technique is use as the main tool for the numerical approach. Numerical solutions for the effects of radiation on a MHD convective heat transfer past a semi-infinite porous plate with a magnetic field are obtained. It is assumed that the porous plate moves with a constant velocity in the direction of fluid flow, and the free stream velocity follows the exponentially increasing small numerical law. The magnetic field acts perpendicular to the porous surface which absorbs the fluid with a suction velocity varying with time. The governing equations for the flow are transformed into a system of nonlinear ordinary differential equations by implicit finite difference technique and then are solved numerically by using the numerical method. "A representative set of computational results for the velocity, temperature and concentration profiles as well as Local skin-friction coefficient, Local Nusselt number and Local Sherwood number are presented graphically for various governing parameters such as Magnetic parameter, Reynolds number, Ecart, Schmidt number, and Kinamatics. In the present analysis various comparisons with previously published work are performed and the results are found to be in a good agreement
Mathematical Modelling and The Transmission Dynamic of The Ebola Disease with Hospitalised Treatment
Get PDFThe model is governed by a system of five ordinary differential equations namely: five compartments namely: the susceptible (S), Exposed (E), Infected (I), Hospitalized (H), and Recovery (R). The model was analyzed to find the global stability, reproduction number, bifurcation, endemic equilibrium, and disease-free equilibrium. The analysis's findings show that the bifurcation displays reverse bifurcation. There is now global asymptotic stability in the system. Based on numerical simulations of the model, it was found that the first week of the outbreak was when Ebola was most common. But as safety precautions were put in place, it gradually decreased. It is significant to remember that in order to avoid a relapse into the original high levels, treatment is required. The contaminated compartment remained high throughout the first five weeks of the outbreak, but with the right therapy, it began to diminish. Due to drug experimenting, the hospitalized compartment saw a large number of patients during the first week. Nonetheless, it kept declining with the right medication administration. The recovery section illustrates that prompt identification and appropriate care are essential for each person to recover from Ebola
Free Convective MHD Flow of Jeffrey Fluid in a Porous Medium in the Presence of Heat Source/Sink
Get PDFThe heat and mass transfer being a driving force in MHD oscillatory free convective flow has been a subject of many studies due to the increasing demand associated with transport processes, existing in nature and industrial application. This study is carried out to investigate an effect of heat and mass transfer on unsteady MHD free convective flow of Jeffrey fluid through porous medium in the presence of heat source. The dimensional governing equations were solved by perturbation technique. The solution for the flow characteristics of velocity, temperature and concentration was obtained. The influence of different parameters such as: thermal Grashof number, mass Grashof number, Jeffrey parameter and heat source/sink, Peclet number for heat and mass transfer ), and radiation parameter were investigated on the flow fields and presented graphically. The fluid velocity decreases with increase in Hartmann number (H). It is found that mass transfer rate increases with increase in Peclet number ). It is noticed that rate of mass diffusion decreases with increase in chemical reaction parameter (K). In addition, the temperature profiles depicted that an increase as the values of heat source/sink parameter , heat transfer Peclet number ), and radiation parameter (N) increases respectively.v
The heat and mass transfer being a driving force in MHD oscillatory free convective flow has been a subject of many studies due to the increasing demand associated with transport processes, existing in nature and industrial application. This study is carried out to investigate an effect of heat and mass transfer on unsteady MHD free convective flow of Jeffrey fluid through porous medium in the presence of heat source. The dimensional governing equations were solved by perturbation technique. The solution for the flow characteristics of velocity, temperature and concentration was obtained. The influence of different parameters such as: thermal Grashof number, mass Grashof number, Jeffrey parameter and heat source/sink, Peclet number for heat and mass transfer ), and radiation parameter were investigated on the flow fields and presented graphically. The fluid velocity decreases with increase in Hartmann number (H). It is found that mass transfer rate increases with increase in Peclet number ). It is noticed that rate of mass diffusion decreases with increase in chemical reaction parameter (K). In addition, the temperature profiles depicted that an increase as the values of heat source/sink parameter , heat transfer Peclet number ), and radiation parameter (N) increases respectively
Analysis of Location and Distribution Pattern of Modern Shopping Centers in Gusau Town Zamfara State, Nigeria
Get PDFResearch on modern shopping centers in Nigeria concentrated on the regional shopping centers in bigger cities and towns neglecting the growing modern shopping centers in smaller towns and cities, which are changing the retail landscape of the country. Not only that, majority are concentrated on the customers’ patronage pattern of these shopping centers and the influencing factors and ignored the relevance of location and distribution pattern in the development and sustainability of these shopping centers. The objective of the study was to analyze the spatial location and distribution pattern of modern shopping centers in Gusau Town Zamfara State, Nigeria. Five shopping centers were selected purposively for in-depth interview. Coordinates of the shopping centers were collected through the use of android-based GPS application, their sizes were measured using measuring wheel and factors of location and distribution was collected through in-depth interview. Spatial analysis tool and Nearest Neighbor Analysis tool of ArcGIS 10.0v were used to show the location and determine distribution pattern of the shopping centers. It was discovered that majority of the shopping centers are located along major roads networks of the town and within/close to middle- and high-income residential areas. The result also shows that, the distribution pattern of the shopping centers is disperse, with observed mean distance of 770.6 meters, nearest neighbor ratio of 1.40 and Z-score of 2.55, with a 5% likelihood that the disperse pattern is as a result of random chance, i.e. the disperse pattern was not as a result of random choice of site/location but careful review and selection of site. The P-value of 0.0109 indicates a significant difference from a random pattern. It is recommended that more investment should be made in the development of these shopping centers as they possess the potentials of creating jobs and raising commercial viability of the town. This is achievable through public private partnership or foreign direct investment
Catalytic Conversion of Waste Polyethene Bags (Groceries Bags) to Liquid Fuels Over 6wt%WO3/γ-Al2O3 Catalyst, Mild Temperature and Atmospheric Pressure
Get PDFThe catalytic pyrolysis of waste polythene bags was conducted at a temperature of 500oC and atmospheric pressure utilizing local fabricated pyrolysis reactor for the process. The 6wt%WO3/γ-Al2O3 catalyst was synthesized via impregnation method and characterized with scanning electron microscope (SEM), Fourier transform infrared (FT-IR) and Brunauer–Emmett–Teller (BET) and applied for the catalytic pyrolysis of waste polythene bags. The results indicated that the catalyzed reaction took shorter time to obtain the liquid fuels as against the uncatalyzed reaction and both liquid fuels resembled the conventional diesel by physical appearance (orange color) and burning properties, the caloric values of catalyzed and uncatalyzed found to be 40.8 and 39.6Mj/Kg respectively as against 40Mj/Kg of the conventional diesel. The total of thirty seven (37) compounds were identified from the uncatalyzed pyrolyzed oil while total of fifty four (54) compounds were detected in the liquid products obtained from the catalyzed pyrolyzed oil. The results revealed that 1-undecene found in the uncatalyzed products was isomerized and alkylated to 4-undecene-5-methyl (E) in the catalyzed pyrolyzed oil. Again, the 1-Dodecene that was found in the uncatalyzed product was found to be isomerized to 4-dodecene (E) in the catalyzed product. More so, 1-tridecene and 2-tetradecene detected in the uncatalyzed product were equally isomerized to 2-tridecene (E) and 7-tetradecene respectively in the catalyzed oil
Assessment Of Sachet Water Quality In Sokoto Metropolis
Get PDFSachet water is among the alternative drinking water among the diverse users in households, industries, ministries, hospitals, schools, restaurants, markets and other places around Sokoto metropolis. Thus, this study sought to assess the presence and the level of physicochemical, heavy metals and biological parameters found in the sachet water produced and consumed in the study area. Therefore, the samples used in the study were purchased randomly from five sampling location and analyzed using standard method of analysis. The results of the study were being subjected to; analysis of variance (ANOVA), descriptive statistics and homogeneous turkey HSD analysis. The ANOVA results showed that all the physicochemical and heavy metals analysed varied significantly at 95% level of significance except chloride (0.081), alkalinity (0.087), total dissolved solids (0.204) and cadmium (1.000) respectively while the descriptive statistics and homogeneous turkey analysis showed that all the physicochemical and heavy metals analysed are within the WHO standard for drinking water except alkalinity with (365.068 mg/l), fluoride (3.245 mg/l) and nitrate (26.405 mg/l) and Fe (9.243 mg/l), Cd (0.02 mg/l) and As (7.503 mg/l) as highest concentration respectively. The biological results reveal that the total coliform bacterial load in the water samples is within the WHO standard of 0-10 MPN index of coliform in 100 cm3 of the water sample. The overall results of the study indicates that the sachet water produced and consumed in the study area are safe and suitable for consumption as more than 70% of the parameters analysed conform with WHO standard for drinking water
Design, Construction and Evaluation of a Potable Dc-Dc Handset Charger
Get PDFBuck converter is a direct current-direct current (DC-DC) power tool that can be used for changing value of DC voltage to another value lower than the original input supply. DC-DC Converters are commonly used in electronic systems, for instance telecommunication systems, Personal Computers, and also used as charge controller for battery. The DC-DC converter is able to replace voltage regulator due to its higher efficiency. This type of converter is commonly used when the supply voltage from the source is higher for an electronic system, for instance charging battery by solar panel, buck converter is connected in-between the supply voltage from solar panel and the storage battery. Voltage from the solar panel is being drop to the value of battery charger. To stay connected to others, hand set charging has become part of our daily activities. A buck converter is designed and constructed to charge a handset in case of power failure from the grid. The DC source is either the lead acid battery, lithium-ion battery or directly from solar panel. The design and simulations were carryout using Proteus software. A reverse voltage protection was added to safeguard the charger circuit from being damage when connected wrongly. Materials were sourced from nearby electronics shops. The system was tested on different handset and found to be working properly
Honeybees: The Year's Most Prominent Guests: An Examination of Contemporary Apiaries in Sokoto State, Nigeria
Get PDFHoney is one of the products with huge benefits to mankind for medication and, a source of income and also serves as a food in many parts of the world, however, they had been affected by many pests. Therefore, the present research aimed to identify the honeybees’ visitors to modern apiaries in Sokoto State, Nigeria. A mixed design methodology involving experimental and ethnographic research methods was employed for the study, samples were collected using snowball purposive sampling techniques were employed, meanwhile 30 hives were used as a sample size from Madorawa, Kware and Duhuwa Locations. The hives were divided into two to detect the level of occurrences of the visitors to the colony. Both the hives were given proper inspection every two weeks to detect the condition of the colonies. The data obtained were analyzed using descriptive statistics, and Chi-Square was used to identify significant association at P < 0.05. The results indicate that, the total pest frequency in the study area is 574, Duhuwa had the highest percentage (39.89%), significant associations of 0.002 and 0.000 were observed between the frequency of the pest at Madorawa and More sites respectively. In conclusion, it was observed that three (3) different classes of pests namely insects, mammals, and reptiles were the visitors of honeybees in modern apiaries of Sokoto State, therefore, it was recommended that, appropriate control and preventive measures should be considered for better production of honey in the study area
A Farm Land Allocation System using Canny Edge Detection Algorithm (CEDA) and Google Earth
Get PDFFarm land allocation in most cases use to be very complex as a result of human error especially when there is paucity of the farm lands. This research focus on the the problem and come with a hybrid solution by combining the Google earth imagery and Canny Edge detection. The Google earth will provide the imagery of the farm lands and the (CEDA) was be used for the allocation and a report will be printed with coordinate of each farm land. The final output of the research helps the three tertiary institutions; Federal University Gusau, Abdu Gusau Polytechnic T/Mafara & College of Agriculture Bakura, Zamfara state in allocating farm land to their staff and communities. Other importance includes: Increase financing income to the institutions, increase Agricultural commodity to the communities, increase capacity utilization of agricultural farms and reduce the level of poverty among the staff/farmers. So also increase efficiency in the records keeping to the institutions
Unlocking High Energy and Power Densities in Supercapacitors: The Role of Moisture Content in Coconut Shell Pulverized Activated Carbon Electrodes
Get PDFThis study explores the potential of coconut shells as a sustainable source for supercapacitor electrodes. Electrochemical characterization revealed pseudocapacitive behavior with a specific capacitance of 15.57 F/g. Interestingly, samples derived from coconut shells with higher moisture content displayed superior energy and power densities, reaching 1.38 Wh/kg and 498,312 W/kg, respectively, as measured by cyclic voltammetry. These findings highlight the crucial role of moisture in enhancing the electrochemical performance of coconut shell electrodes. The utilization of coconut shells from humid regions presents a promising strategy for developing high-performance supercapacitors that offer both excellent energy storage and extended lifespan