DEVELOPMENT OF MICROCONTROLLER BASED AUTOMATIC POWER SWITCH WITH GENERATOR START AND STOP CONTROLS

The erratic nature of power supply and use of generators as alternative source of electricity in the developing countries like Nigeria has necessitated the need for a mechanism that switches power to a given load between two sources of supply.. This study was therefore initiated to focus on the design and implementation of an automated system that executes switching functions usually from public supply to generator and vice versa when mains supply is unavailable and when it is restored. The device consists of power supply unit for converting from alternating current (A.C.) to direct current (D.C.), logic circuit for detecting when mains power is restored, relay unit for performing power switch as well as control unit for starting and stopping a generator. It was observed that the device eliminates the stress and possible downtime associated with manual operation of a change over switch. The study recommends the device to be essential in hospitals, banks, government and private agencies where critical operations requiring constant availability of power are carried out.&nbsp

Using mathematical model to design and sizing of pumping water system

The role of the pump in any pumping system is to provide sufficient pressure to overcome the operating pressure of the system in order to move fluid (water) at a required flow rate to the user. In this study, a mathematics model was used for design in order to provide adequate water supply to every quarter in Federal Polytechnic Mubi, Adamawa state Nigeria. According to the research, the proposed water supply requires a 1360W power pump, a 1500W inverter, and a 1500W solar panel. Because the suggested water supply is based on renewable energy, the study found that it can be used at Federal Polytechnic Mubi to increase their supply for human use. As a result, the FPM management has reduced greenhouse gas emissions

THE QUALITY ATTRIBUTES OF GARI SOLD IN SOUTHWESTERN NIGERIA

Work on the quality attributes of gari sold in southwestern Nigeria is reported .This was with a view to determine the extent to which the product has conformed to FAO standards. Ten samples of gari were randomly collected from five markets within the study area. The proximate composition and physical properties of the sample were determined using standard methods and data were analysed statistically. Results showed the crude fibre content ranged between 1.00-1.90%, moisture content 8.5-14.5%,ash content 0.24-1.97%,carbohydrate content 80.91%-87.4%,swelling capacity(29.70-57.40),water absorption capacity 3.85-6.10g/g, bulk density 2.39-2.79g/cm3  and ph 5.50-6.60. The statistical analysis of the physicochemical properties of the samples showed variations at  p≤0.05 level of significance in the properties of the samples within the same market . The crude fiber and moisture content of sample 1 and 4 respectively were not significantly different (p≤0.05) from the recommended FAO standard at 95% confident level. The nutritional compositions of gari though highly variable fall for all the quality assessed were lower than the recommended FAO standard except for the moisture content of samples 2 and 6 which were significantly higher at 95% confidence level . In conclusion, there is the need ,for enlightenment of all stakeholders to ensure the attainment and maintenance of the minimum quality standards for gari sold in the markets as recommended by FAO

Les corps étrangers en ORL: expérience de dix ans

Les corps étrangers (CE) représentent une pathologie fréquemment rencontrée en pratique ORL d'urgence. Ils peuvent constituer une urgence vitale par leur aspect ou leur siège. Nous présentons le bilan de dix ans sur la prise en charge des CE de la sphère ORL avec une revue de la  littérature. Il s'agit d'une étude rétrospective entre Janvier 2004 et Décembre 2013, incluant tous les cas de CE des voies aéro-digestives supérieures et auriculaires colligés dans le service d'ORL au CHU Mohammed VI de Marrakech au Maroc. Sur les 1317 cas de CE de la sphère ORL colligés durant cette période, 80,48% concernaient les enfants. Le sex-ratio était de 1,5. L'âge moyen était de 12,92 ans. Les CE oesophagiens étaient les plus fréquents (47,53%). Les complications ont été rencontrées dans 11,69% des cas. Les CE dans la sphère ORL restent fréquents en pratique quotidienne surtout chez les enfants. Leur prise en charge nécessite une intervention rapide avec un matériel adapté et des médecins entrainés. La prévention reste la meilleure solution

SOUND EFFECTS OF OCCUPATIONAL NOISE EXPOSURE ON PERSONNEL IN BURR MILL PROCESSING CENTRES

Noise pollution is almost everywhere in human day to day living; occupational noise exposure is a rampant problem facing different occupation with many not knowing the extent of damage that is been done to personnel working in a noisy environment. In Nigeria little is the research that has been carried out in area of noise pollution, recognizing this; this project was aimed at assessing and comparing the level of noise generated and its exposure effect on the personnel working in agro-processing center with emphasis on a burr mill processing center. Noise generated in the milling centers were read at different spatial location within Bodija Market that makes use of burr milling machine for particle size reduction of agro-based produce with Testo 815 sound level meter. The sound level read was compared to that specified by United State Occupational Safety and Health Administration (OSHA) and National Institute of Occupational Safety and Health (NIOSH), these standards were used because it has been adopted by Nigeria’s National Environmental Standards and Regulations Enforcement Agency (NESREA). Result shows that noise generated from dry milling operation varies from 89.9dBA-99.3dBA; on the average these levels exceeded the standards specified by the various regulating authorities. Burr mill operators are exposed to excessive occupational noise as showed by the sound level readings, which results into noise induced hearing loss NIHL as corroborated by the response of 26% of the respondents that reported high severity in loss of hearing and other non-auditory health implication which affects them.&nbsp

Systematic review and meta-analysis of tuberculosis in animals in Nigeria

Animal tuberculosis (TB) is a contagious and chronic disease caused by mycobacteria belonging to theMycobacterium tuberculosis complex (MTBC) in domestic and wild animals. MTBC strains infection has been confirmed in many animal species in Nigeria, including captive wildlife, cattle, dromedary camels, goats, and pigs. Despite widespread infection and the potential impact of the disease on public health, active surveillance and control strategies are absent in Nigeria. This study aimed to conduct the first comprehensive meta-analysis to assess the distribution of tuberculosis and analyze the potential moderators of infection in animals in Nigeria. Eligible studies (sixty-one (Cadmus et al., 2014) [61] prevalence and seven (Menzies and Neill, 2000) [7] case reports) were retrieved and included in the analysis. The analyses showed an overall pooled TB prevalence of 7.0% (95% CI: 6.0-8.0) comprising of infection distributed in cattle (8.0%, 95% CI: 7.0-8.0), goats (0.47%, 95% CI: 0-1.2), sheep (0.27%, 95% CI: 0.14-0.46), camels (13.0%, 95% CI: 0-47), and wildlife (13.0%, 95% CI: 9-16) respectively. The occurrence of infection was significantly moderated by the publication periods, geographical location, sample size, and detection methods. TB prevalence was heterogeneous across several predictors, with the year of publication exhibiting a higher rate (46%) of the detected heterogeneity. These findings should provide policy-relevant information to guide the design and establishment of prevention and control measures amenable to the local situations in Nigeria. © 2023 The Author(s

Effect of different levels of supplemental yeast on performance indices, serum enzymes and electrolytes of broiler chickens

The aim of the study was to investigate the effect of supplemental probiotic preparation on performance indices, serum enzymes and electrolytes of broiler chickens. Two hundred (200) day-old Marshall broiler chicks were randomly selected and distributed based on the level of supplementation into four groups of 50 chicks each (Control, C; E10.5%, E21.5% and E32.0%). Chickens fed 2.0% probiotic had a significantly higher body weight when compared with the control group. Activity of alanine aminotransferase differed significantly in the group E10.5%, and especially (p<0.01) in the group E11.5%. Alkaline phosphatase activity decreased significantly (p<0.05), when compared with that of the control group. Serum calcium and phosphorus concentrations in experimental groups were significantly higher. Potassium concentration in experimental group rose significantly (p<0.05), when compared with that of the control broiler chickens. In conclusion, supplementing broiler feeds with 2.0% yeast probiotic improved performance indices, serum enzyme activities and enhanced the maintenance of electrolyte homeostasis in broiler chickens.Keywords: Body weight, feed conversion ratio, serum biochemistry, Saccharomyces cerevisiae, broiler chicken.African Journal of Biotechnology Vol. 12(35), pp. 5480-548

A HYBRIDIZED ENCRYPTION SCHEME BASED ON ELLIPTIC CURVE CRYPTOGRAPHY FOR SECURING DATA IN SMART HEALTHCARE

Recent developments in smart healthcare have brought us a great deal of convenience. Connecting common objects to the Internet is made possible by the Internet of Things (IoT). These connected gadgets have sensors and actuators for data collection and transfer. However, if users' private health information is compromised or exposed, it will seriously harm their privacy and may endanger their lives. In order to encrypt data and establish perfectly alright access control for such sensitive information, attribute-based encryption (ABE) has typically been used. Traditional ABE, however, has a high processing overhead. As a result, an effective security system algorithm based on ABE and Fully Homomorphic Encryption (FHE) is developed to protect health-related data. ABE is a workable option for one-to-many communication and perfectly alright access management of encrypting data in a cloud environment. Without needing to decode the encrypted data, cloud servers can use the FHE algorithm to take valid actions on it. Because of its potential to provide excellent security with a tiny key size, elliptic curve cryptography (ECC) algorithm is also used. As a result, when compared to related existing methods in the literature, the suggested hybridized algorithm (ABE-FHE-ECC) has reduced computation and storage overheads. A comprehensive safety evidence clearly shows that the suggested method is protected by the Decisional Bilinear Diffie-Hellman postulate. The experimental results demonstrate that this system is more effective for devices with limited resources than the conventional ABE when the system’s performance is assessed by utilizing standard model

X-ray Absorption Near-Edge Structure (XANES) at the O K-Edge of Bulk Co₃O₄: Experimental and Theoretical Studies

We combine theoretical and experimental X-ray absorption near-edge spectroscopy (XANES) to probe the local environment around cationic sites of bulk spinel cobalt tetraoxide (Co3O4). Specifically, we analyse the oxygen K-edge spectrum. We find an excellent agreement between our calculated spectra based on the density functional theory and the projector augmented wave method, previous calculations as well as with the experiment. The oxygen K-edge spectrum shows a strong pre-edge peak which can be ascribed to dipole transitions from O 1s to O 2p states hybridized with the unoccu- pied 3d states of cobalt atoms. Also, since Co3O4 contains two types of Co atoms, i.e., Co3+ and Co2+, we find that contribution of Co2+ ions to the pre-edge peak is solely due to single spin-polarized t2g orbitals (dxz, dyz, and dxy) while that of Co3+ ions is due to spin-up and spin-down polarized eg orbitals (dx2−y2 and dz2 ). Furthermore, we deduce the magnetic moments on the Co3+ and Co2+ to be zero and 3.00 μB respectively. This is consistent with an earlier experimental study which found that the magnetic structure of Co3O4 consists of antiferromagnetically ordered Co2+ spins, each of which is surrounded by four nearest neighbours of oppositely directed spins