No abstract

To integrate technology in teaching and learning, the need arises to investigate the teaching needs of educators making the transition from a traditional to technology mediated environment. This qualitative study selected a convenience sample of 120 faculty and administrators. Using an interview guide, interviewers met with 100 participants. Data was transcribed, and entered into a database for analysis. Findings reported were technology in teaching. Concluding statements report that participants use technology in their teaching. However, many faculty members are not integrating technology in their teaching or assessment strategies, or using technology in instructional management. Faculty members are interested in learning how to incorporate technology in their teaching and their comments suggest their need to combine technology with principles of pedagogy, andragogy, and constructivism.

The Covid-19 pandemic has indeed driven educational technology to the next higher level, especially in faculty teaching and research. There is an increasing need for faculty to embrace new technology, especially with the emergence of new normal in both teaching, learning, and research. To become conversant with the technologies, educators need opportunities for professional development. And to continue to be involved with new and evolving technologies in education, faculty members seek leadership and support. This study was carried out to investigate the leadership role in the professional development of technology in the educational delivery system of Nigerian universities. The study adopted a qualitative approach. This qualitative study randomly selected a convenience sample of 100 faculty and administrators in the faculty of education of 12 universities in Nigeria. Using focus-group discussion sessions, interviews, the researchers met with 100 participants in groups of 3 to 15 each session. Data were transcribed and entered into a database for analysis. The leadership role of faculty members, technology specialists, policy, support, and infrastructure were discussed. The study shows that to help faculty members lead the way in investigating, integrating, and evaluating technologies, faculty members need policies and leadership support, equitable access to technology, support, professional development, and recognition.

In the development of most phenomenological models used to explain the infrared excited luminescence, a major assumption is usually made in the degree of freedom the excited charge has. One of the two extremes is normally assumed: charge is free to move anywhere over the whole crystal, or it is confined close to the trap and the centers immediately adjacent to it. Determining which of these extremes is more reasonable is difficult to do on the basis of the temporal behavior of the luminescence intensity alone. However, this assumption has important consequences for the understanding of the dynamics of the luminescence process because of the difference in the number of recombination and trapping centers available to the excited charge. Additional experimental evidence was thus sought on this aspect of charge movement. One such experiment is the detection of photoconductivity in which an electrical current is measured during optical excitation or shortly there-after. In this paper, the details of photoconductivity experiments on K crystal are presented. Photoconductivity measurements were inconclusive as to whether or not there was a current flowing during the 850 nm excitation of a feldspar sample. However, there was a clear current when exciting the same sample with 515 nm light, but there was a complex relationship between the magnitude of the current and the number of emission photons counted. A model was developed to explain the photoconductivity results where electrons migrate through the conduction band aided by thermal excitation and tunneling.

This paper presents theoretical and experimental work on development of Tetrahertz (THz) generation and detection schemes. Here, the PC THz generation processes are applied to the formation of transmission line coupled THz electrical waveforms. After a brief explanation of the experimental setup employed, the concept of PC self-switching is introduced through theoretical and experimental work on coplanar gallium arsenide (GaAs) PC self-switching. Here, it is shown that ultrashort THz electrical pulses can be formed on transmission lines through a time delayed multi switching process. The coplanar PC switch was presented to explain the operation of the device. By employing sufficiently short electrode spacings, it was found that the operation of the device could be extended into the THz frequency domain.

The goal of intensity-modulated radiation therapy (IMRT) is to deliver a uniform dose to the tumor with minimal margins around the target, in order to increase local control of the disease while reducing secondary effects. The research performed in this work has shown the potential usefulness of the Fricke-gel dosimeter as a quality assurance (QA) tool to verify IMRT treatments produced by inverse treatment planning. First, the 3D integrating Fricke-gel dosimeter was successfully compared to an accepted dosimetric tool. It was then used to measure relative 3D dose distributions of simple treatment plans with multiple square or rectangular fields and specific inverse-planned IMRT treatment plans. By combining the CT anatomical information and the plan contours with the gel-measured data, it was possible to display the contours on the measured dose and the measured isodose lines on the CT, in addition to measuring dose-volume histograms (DVH) for the plans. This demonstrated the usefulness of the gel dosimeter as a QA tool for IMRT and inverse planning.

In medical diagnostics, therapeutic, laboratory, intensive care unit devices, and machines application, two form of Electrical Energy is utilized. Alternatives current (AC) and Direct current (DC) form. In this paper an inverter driver system with a display model is made using MATLAB and its specific tool box of Simulink, the process will involve converting single phase alternating current power to direct current using rectifier made from ordinary normal diodes then converted to three phase using three-arm insulated gate bipolar transistors this is commonly known as inverter bridge which is sufficient enough to run three phase loads depending on the application requirement. The system uses a five-level inverter with low levels of distortions and ripples in the equipment output, this increase and improves the performance of the system. Using carefully selected passive and active elements such as capacitor resistors, inductors, diodes, and transistor system in inverter, decreases the number of switches and boosts the efficiency of the system. This inverter drive system helps us to run three phase machines in the health facility at the same frequency of single phase. The inverter system allows a smaller smoothing capacitor in the DC-AC link as proposed. Large smoothing capacitors are conventionally essential in such converters to absorb power ripple at twice the frequency of the power supply. The proposed network topology consists of an indirect matrix converter and an active snubber to absorb the power ripple, and does not necessitate a reactor or large smoothing capacitor. Simulation result is shown using MATLAB software and used to verify system operation principle as well as circuit development and their control mechanism for a How to cite this paper: Muhamad, M.M., Kibirige, D., Uzorka, A. and John, U.K. (2022) Design and Simulation of an Inverter Drive System with a Display for a Renewable Energy System in the Rural Isolated Communities of Uganda.

In their ideal form, feldspars are wide bandgap (> 5 eV) insulators with a well-defined crystal structure. A natural sample may contain different feldspar phases, disorders, twinning effects, fractures, dislocations, and highly variable impurity contents. With such messy materials, one might expect that exposing the samples to ionizing radiation would alter the structure so that the results from a single feldspar would not be reproducible. However, one finds that the luminescence emission changes with sample temperature in a similar way for different feldspars and decays away with prolonged Infrared (IR) exposure at a similar rate. In these experiments, the luminescence intensities of irradiated aliquots of A1, K3, K6, and VI.1 were measured while they were exposed to 850 nm exciting light either for long periods at constant aliquot temperature or while the aliquot temperature was changed during the optical excitation. I found that the luminescence intensity decreased with time for all sample aliquots, and all emission bands if the optical excitation and the aliquot temperature remained constant. The decay rate for the luminescence from K3 was found to be independent of temperature, but for the other samples, it was not. Our results are consistent with a model consisting of one type of trap, and electrons excited from these traps recombine at different luminescence centers producing the different emission bands. Differences in the activation energy and work function values between our samples for the same emission band, and between our samples and those of others, are interpreted as being caused by slightly different environments around the traps and luminescence centers.