Sensitivity analysis of the parameters of a cholera model

In this paper, a deterministic mathematical model is formulated to analyse the degree of sensitivity of some factors that aid cholera transmission and management. We obtain the disease-free equilibrium point and conduct the local stability of the disease-free and endemic equilibria of the model. Reproduction number with interventions is stated and the method of normalised forward sensitivity index is employed to determine the numerical value of the key model parameters with respect to the effective reproduction number in order to determine their relative importance to cholera transmission and management. The results obtained show that the most important parameter to cholera transmission is the contact rate between susceptible and infectious individuals while the most crucial parameter to cholera management is the rate of cholera awareness.Keywords: Mathematical model, stability analysis, reproduction number, sensitivity inde

Development of Automatic Switch using PIR and SSR for Day and Night Detection

None conservative attitude is observed among the African people in non-conservative utilization of public power supply. Individuals are often observed power on the lightings, cooling systems when not needed at homes, offices and commercial centers. This increases power bills and may hinders a nation from diverting power to industrial areas, limiting the process of industrialization and waste of energy. To avert these, this paper presents development of automatic switch using passive infrared sensor (PIR) and solid state relay (SSR) for day and night detection. The objective of this project is to replace the electromagnetic relays which may fail as a result of carbon forming resulting from arching in existing designs with solid state relay. Also, the system is to conserve energy more by ensuring that bulbs are not powered on during the day time except in cases of darkness. The circuit was designed using components such as; power supply, PIR sensor, Light Dependent resistor (LDR) sensor, Microcontroller and SSR, as showed in the circuit figures 1 and 8. The system is achieved using PIC16f628 which is programmed using Micro-C, SSR for switching, PIR for human detection and LDR to detect night and day. The system was tested and worked perfectly. It helped to conserve energy

A Systematic Human Counting at Guest House using Sensing Device Technique

The application of vision detector using sensing device techniques is important in systematic counting of people both indoors and outdoors. This technique is broadly used in auditorium, lecture theatre and public market. In this paper, the technique uses a camera attached to an Android-based mobile phone which is then applied to capture images that are then transferred to a storage system via USB for image processing and counting. Also, a model for counting people indoors and outdoors is developed. Also, accurate human counting is observe

Development of a System for Counting of People Using MultiCamera and Sensors

There has always been the issue of knowing the number of people present in a place such as symposiums, workshops, religious centres. Manual methods have often been employed. During the use of manual methods, the ushers are required are to stand along the pathways, this can then result to congestion in the pathway or even cause the speaker to lose focus. This paper focuses on to solving the problem of overcrowding and at the same time counting of people available in a place per time. In the paper, image sensing camera were used, the sensing device coupled with the camera were used to capture the image of people in a learning environment. MATLAB/SIMULINK software were used for the experiment. The result showed that the method is 85.4 % accurate with the ground-truth of 254 and TP of 217

Serospositivity of Hepatitis B and C among Blood Donors in Private Laboratories in Lagos Nigeria

Background:. Difficulties in meeting demand of blood transfusion by government hospitals have dictated the need for patronizing laboratories by both government and private hospitals.Objective: The study was undertaken to ascertain the prevalence HBsAg and hepatitis C Virus of blood donors in private laboratories in Lagos Nigeria.Result: A total of 315 participants were used for this work 298 were male (94.6%) Seventeen (17) 5.4%were females.  4.8% tested positive for HBsAg. Male constitute 80% prevalence of the positive group. Analysis of gender related prevalence of HBsAg showed that prevalence was higher in females (17.3%) than males (4%).prevalence of 1.5%.was Hepatitis C (HVC Ab).positive participants are in the age range of 21-30.Conclusion:  The result revealed a decline in prevalence of viral hepatitis among voluntary blood donors in Lagos Nigeria. Key words: hepatitis B virus, hepatitis C virus, blood donor

Comparison of the Elemental Structure and Emission Characteristics of Selected PVC and Non PVC Ceiling Materials Available in Nigerian Markets

The recurring fire outbreak in buildings in Nigeria is quite alarming, just as the shift to the use of PVC as a choice for ceiling material due to its aesthetic appearance is on the increase. Hence this study determined the emission characteristics PVC and non-PVC samples. This was done with a view to establishing their suitability as ceiling materials in building designs for tropical countries and providing thermal and combustion data for building stakeholders that could help to checkmate man made fire disasters. This experiment involves the burning of a consistent mass, 50g of 6 samples of 3 PVC and 3 non-PVC in an open furnace where the combustion is carefully controlled. It investigates the flue gasses concentration emitted in the cause of fire outbreak and its effect on occupants. It responds to the question in mind that not only visible flame kills but also toxicity from flue gas can be detrimental to health of victims. The results showed that PVC samples are unwelcome in terms of their emission characteristics which were due to their elemental makeup of their composites such as PVC recorded highest Carbon composition of 77.9% and lowest oxygen composition of 18.0 %. VOCs are cancerous, cause dizziness, rapid heartbeat, vomiting and eventual death. Benzene, a known VOC, is used in making PVC which is a human carcinogen compound. Ceiling materials that will achieve low noxious emission and as well fire retardant should be investigated and employed for use. These materials can be improved upon to achieve environmental friendly building materials

Assessment of selected agroclimatic indices on maize yield forecasting under climate change in Nigeria

This study investigates the relationship between climate, agroclimatic indices, and maize yield in Nigeria, focusing on diverse agroecological zones. Climate change is poised to significantly impact agricultural output. Analysis of historical data reveals varying sensitivities to weather changes in Nigeria's agroecological regions. Regional climate impact assessments typically use annual statistical models, which may not capture sub-seasonal weather variations and often assume a constant relationship between crops and weather. Crop yield anomalies were created to remove non-weather-related influences from a time series dataset. Also, agroclimatic indices were incorporated into forecasting models as inputs to offer more relevant information for estimating crop output. The research demonstrates the critical role of climate factors such as rainfall in March and minimum temperatures in shaping maize yield in Nigeria. By expanding the scope to include a broader range of climate-related elements, this study has illustrated how incorporating agroclimatic indices into crop yield forecasting models can enhance forecast accuracy and reliability. The study reveals that different agroecological zones may face varied outcomes with regions in the south recording more negative maize yield anomalies as oppose to the north. The research underscores the complexity of the relationship between climate, agroclimatic indices, and crop yield in Nigeria. It provides essential insights for policymakers, farmers, and researchers to make informed decisions and develop strategies for ensuring food security and agricultural sustainability in the midst of a changing climate in Nigeria

2k Factorial Experiments on Factors that Influence the Recovery of Gold during the Upgrade of Ilesha-Itagunmodi Gold Ore through Froth Flotation

A low-grade gold ore from Ilesha-Itagunmodi, south western Nigeria was panned, dried and ball-milled before sieving into fractions. The morphological, mineralogical and chemical composition was studied by optical micro-scopy (Reflected and Transmission), X-ray diffraction (XRD) and Energy Dispersive X-ray fluorescence (XRF), respectively. The sieved fractions were subjected to chemical analysis (AAS). The +106 μm sieve had the highest concentration of the mineral and was then selected for the upgrade through froth flotation using standard rea-gents. In this paper a report on a 2k factorial experiment that provides an understanding of the impact of opera-tional variables on the quantity of gold mineral obtained from the ore during froth flotation is presented. Analy-sis results showed that Ilesha-Itagunmodi gold ore is non-refractory with fine grain particles, amenable to froth flotation and contained about 20 other associated minerals, gold had a concentration of about 0.0024%. A com-bination of P-Xanthate and amine glycol collectors at a pH of 9.2 only produced a considerable increase in gold yield. This translated to about 87.13% increase in recovery of gold from the ore. Analysis of variance (ANOVA) was carried out and the model equation obtained was subsequently optimised to obtain a model equation that could be used in predicting the recoverable quantity of gold, indicating that F11,1-values for Collector concentra-tion, Frother concentration, pH and Conditioning time were 156.86, 6.96, 43.81, and 56.77 respectively. A model with an F value of 88.41 was obtained which indicated that the model was significant. The model equation obtained was subsequently optimised to be able to predict the recoverable quantity of gold. A “Pred R-Squared” value of 0.9365 (93.65%) was also obtained and is in reasonable agreement with the “Adj R-Squared” value of 0.9534 (95.34%). It was established that Ilesha placer gold ore is amenable to froth flotation using standard reagents

Effects of Emission Characteristics on Elemental Composition of Selected PVC Ceiling Materials

This research work determined the emission characteristics and elemental composition of selected PVC ceiling materials common in Nigerian markets especially during service. This research work determined the emission characteristics and elemental composition of selected PVC ceiling materials common in Nigerian markets. The emission data and elemental structure gave insight to appraise their suitability as ceiling materials. Three PVC ceiling materials were used for this analysis: Nigerian made PVC, layered Composite PVC and white PVC. Rutherford Backscattering Spectrometry (RBS) was performed to obtain the elemental structure of the ceiling materials using Ion Beam Analysis facility. 0.05 kg of the samples were combusted in a controlled fire chamber and the gasses emitted; CO, SO2, NO, and volatile organic compounds (VOC) were identified using four gas analyzers. Elements were detected in total and data collected from the experiment were analyzed. Results showed that Nigerian made PVC has the highest total noxious gas among the three samples with value of 3732.5 ppm while layered composite PVC has the lowest among the PVCs with the value of 1477.5 ppm. The elemental make-ups of the samples influence their emission characteristics. The study established that PVC samples were noxious in terms of their emission characteristics due to the effects of their elemental basis

Comparison of the Elemental Structure and Emission Characteristics of Selected PVC and Non PVC Ceiling Materials Available in Nigerian Markets

The recurring fire outbreak in buildings in Nigeria is quite alarming, just as the shift to the use of PVC as a choice for ceiling material due to its aesthetic appearance is on the increase. Hence this study determined the emission characteristics PVC and non-PVC samples. This was done with a view to establishing their suitability as ceiling materials in building designs for tropical countries and providing thermal and combustion data for building stakeholders that could help to checkmate man made fire disasters. This experiment involves the burning of a consistent mass, 50g of 6 samples of 3 PVC and 3 non-PVC in an open furnace where the combustion is carefully controlled. It investigates the flue gasses concentration emitted in the cause of fire outbreak and its effect on occupants. It responds to the question in mind that not only visible flame kills but also toxicity from flue gas can be detrimental to health of victims. The results showed that PVC samples are unwelcome in terms of their emission characteristics which were due to their elemental makeup of their composites such as PVC recorded highest Carbon composition of 77.9% and lowest oxygen composition of 18.0 %. VOCs are cancerous, cause dizziness, rapid heartbeat, vomiting and eventual death. Benzene, a known VOC, is used in making PVC which is a human carcinogen compound. Ceiling materials that will achieve low noxious emission and as well fire retardant should be investigated and employed for use. These materials can be improved upon to achieve environmental friendly building materials