Outdoor Worship Concert

This is the poster for the Outdoor Worship Concert, held on Tuesday, September 12, 2023, at 6:30, at the OBU Amphitheatre. It featured the OBU Choirs

Competitive Effects of Intra-Industry Public Equity Offerings on Stock Repurchases and Bond Issuance Decisions of Rival Firms: Empirical evidence from the Nordic Region.

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Nosocomial infections in neonatal intensive care units: Cost-effective control strategies in resource-limited countries

Background: Nosocomial infections or hospital-acquired infectionsconstitute a global health problem. They lead to significant morbidity and mortality in both developed and resource-limited countries. The neonatal intensive care unit (NICU) is a suitable environment for disseminating these infections; underscoring the need for preventive intervention measures.Objectives: This review aims to highlight the global burden of nosocomialinfections in neonatal intensive care units (NICUs), to discuss their epidemiology and clinical spectrum, as well as the costeffective control strategies in resource-limited settings.Sources: Sources of information were from Google searches andPubMed- linked articles using the key words- nosocomial infections,neonatal intensive care unit, control. Related articles from hard copiesof medical literature and journals were also gathered.Results: Although paucity of data exists on the incidence of nosocomialinfections in NICUs in developing countries, reports from developedcountries indicate a range of 6% to 25%. Much higher figures were noted in some developing countries. Several risk factors for nosocomial infections were identified but varied in different NICUs surveyed. Effective control strategies have been recommended but hand washing or hand hygiene appears universally applicable in both developed and resource-limitedcountries. Economic analyses of these strategies in developed countrieshave established their costeffectiveness while the adaptability of hand hygiene program to resource-limited settings has been demonstrated in a World Health Organization pilot study in sub- Saharan Africa.Conclusion: Hand washing or hand hygiene by health-care personnelremains the most important evidence-based and cost-effective controlstrategy for the spread of nosocomial infections in NICUs in resource-limited countries.Key words: nosocomial infections; neonatal intensive care unit;control

A kinematic model for calculating the magnitude of angular momentum transfer in an accretion disk: Itime- independent case

Keplerian velocity laws imply the existence of velocity shear and shear viscosity within an accretion disk. Due to this viscosity, angular momentum is transferred from the faster moving inner regions to the slower-moving outerregions of the disk. Here we have formulated a model for calculating the magnitude of angular momentum transfer in a steady-state accretion disk using only two parameters; the transport coefficient of vorticity,w and the rate of change of angular velocity with radial distance, dW/ dR . With this model, the mass accretion rate in an accretion disk , can be determined without necessarily making use of the observed value of the luminosity of the accreting system

The Effects of Transactional Barriers on the Effectiveness of a Firm’s Competitive Strategy

Extant literature has shown that firms’ decisions can exert a bearing on the effectiveness of their competitive strategy. This paper seeks to extend this body of literature by demonstrating how and under what circumstances a firm’s decision about transactional barriers, which it can impose on its customers, can impact the degree to which it can effectively deploy its competitive strategy in realizing its maximum possible profits. The study’s main findings demonstrate that at equilibrium, the size of the set transactional barrier is on average inversely related to the effectiveness of the firm’s competitive strategy, holding constant the consumers' income and other factors. Furthermore, the effectiveness of the firm’s competitive strategy in attaining the firm’s optimal profits is jointly and individually enervated by the price elasticity of the firm’s product demand and the size of the transactional barrier that it imposes on its customers. Additionally, the effectiveness of the firm’s competitive strategy tends to be maximized as the size of the transactional barrier tends to be zero. Therefore, the findings in this paper suggest that under the assumptions of the model in this paper, the optimal size of a transactional barrier to be imposed by a firm, in the service industry, should be zero. &nbsp

Time-independent inverse compton spectrum for photons from a plasma cloud of finite extent

The general theoretical aspects of inverse Compton scattering was investigated and an equation for the timeindependent inverse Compton spectrum for photons from a plasma cloud of finite extent was derived. This was done by convolving the Kompaneets equation used for describing the evolution of the photon spectrum from a plasma cloud of infinite extent and the distribution of photons over escape time. By looking for a power law solution to the equation so derived, was revealed that the spectrum produced by inverse Compton scattering depend only on the electron temperature and optical depth

Enhanced frequency regulation functionality of grid-connected PV system

Thesis (MEng (Electrical Engineering))--Cape Peninsula University of Technology, 2019Electric utilities are confronted with challenges like rising fuel costs, aging equipment, increasing energy demand, frequency regulation and the difficulty to integrate renewable energy resources into the grid. The presence of photovoltaic (PV) penetration on the utility grid is also increasing significantly in recent years. With the recent rise in PV penetration and the advancement of the global PV industry, there is an urgent and a necessary need to introduce features in PV systems that will make them respond smartly. However, much of these can be addressed without negatively affecting the total performance and power quality of the grid. Hence, engaging smart Grid technologies, and leveraging the benefits of the distributed nature of PV, new prospects to unearth value can be created. Through the implementation of progressive energy storage techniques, efficient two-way communications, a grid-tied PV system can create significant value, mostly through improved PV contribution in grid support functions like frequency regulation. An enhanced frequency regulation functioning scheme for a grid-connected photovoltaic (PV) system is modelled in MATLAB/Simulink software environment. The system is designed to operate in grid ancillary services precisely, frequency regulation function. The model consists of a Photovoltaic (PV) plant with a battery connected to the grid through a three-phase inverter. A bi-directional DC-DC converter between the grid and the battery system is included. The model has a battery storage system that provide steady and regular active/reactive powers available while the grid transmit specific amounts of power needed for a specific duration. According to the design, either the grid or the PV system depending on the dominant energy situation charges the battery. The battery is designed to discharge only when the grid demands energy from the PV and if the PV system fails to meet the demanded active power or reactive power. The PV system and the battery storage is integrated with the grid with the aid of dc-ac inverter in such a manner that bi-directional flow of active and reactive power is achieved. A 1 MW PV system is connected to the utility grid through a three-phase voltage source inverter system. The grid nominal frequency is set at 50 Hz under normal operation. However, the frequency decreased when the PV was not producing required power hence, the battery responded almost instantaneously and returned the frequency to the nominal frequency. The effectiveness of battery storage system for utility grid frequency regulation was substantiated from the simulation results attained

Sustainable control of Anopheles mosquito population

Despite the widespread use of insecticides, community engagement programmes and preventive measures mosquito borne diseases are growing and new tools to prevent the spread of disease are urgently needed. An alternative control measure for the eradication of Anopheles mosquitoes is suggested by the use of a Sustainable Control Model, which demonstrates the capability of Odonata, a natural beneficial predator, to exercise control over Anopheles mosquitoes in less than 140 days