Department of Science, Mathematics and Technology Education

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http://196.220.97.103:4000/handle/123456789/350

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Browsing Department of Science, Mathematics and Technology Education by Author "Chasokela, D."

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    Barriers to the Implementation of Agenda 2030 United Nations Global Goals in the Zimbabwean Higher Education Context
    (International Journal of Latest Research in Humanities and Social Science (IJLRHSS), 2022-07-07) Mhlanga, E.; Tlou, F.N.; Phuthi, G.S.N.; Manokore, K.; Sibanda, Z.; Chasokela, D.; Mpofu, M.; Sibanda, L.
    The struggle towards development is not acquiring anticipated progress in Zimbabwe. This study unearthed barriers to a fruitful implementation of Agenda2030 United Nations goals in the Zimbabwean context. An interpretive paradigm was used for the study and a qualitative approach that embraced a case study was employed. Data was collected through face-to-face interviews with the professional stakeholders. Among the highly ranked barriers towards the implementation of Agenda 2030 are deprived sustainability education in academic organizations, lack of resources to implement the goals, unawareness of development and its cost benefits, low prioritization and resistance to cultural change in academic institutions. The research recommends adequate sustainability education in academic institutions to positively impact the required cultural change in the industry. There is demand for suitable government policies that support implementation of Agenda 2030. The study also advices for the need of the implementation of Agenda 2030in education through continuing professional development and to improve the thinking and practicability of sustainable practice in Zimbabwe.
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    Fuzzy PI Based Motor Speed Control using DSP TMS320F2812
    (International Journal of Latest Research in Humanities and Social Science (IJLRHSS), 2022) Chasokela, D.
    Alternating Current (AC) induction machine plays an important role in the entire industry and daily life. This is due to their robustness, inexpensive and easy to maintain in a period of time. Vector control is used in large numbers in the speed control of AC induction machine. High dynamic performance high speed precision and wide constant torque range capabilities are the key benefits of vector control. Stability of the system during transient process and a wide range of operation are assured through the application of vector control. The purpose of this thesis is to study the vector control of AC induction machine based on the principles of the AC speed control system, vector control and fuzzy Proportional integral (PI) control, and implementing the digital vector control systems based on the digital signal processor (Digital Signal Processor-DSP TMS320F2812) from Texas Instruments. The mathematical modeling of the AC induction motor and the principles of vector control and fuzzy systems are overviewed first. Fuzzy PI regulator is then proposed to carry out the regulation of the motor speed. The fuzzy PI is an intelligent technique that has evolved in the last decades and it emulates the human way of thinking. Therefore the fuzzy PI does not need the exact mathematical model. In-depth study of fuzzy PI and the normal PI was carried out. Matlab/Simulink software is used to simulate the vector control of the AC induction motor with both fuzzy PI regulator and normal PI regulator for comparative purposes. Simulation results showed that fuzzy PI has a better performance in terms of stability, faster response and robustness, and the fluctuation ripples are also smaller. Experiments had been done on the laboratory platform of AC drive system with the help of AC speed control monitor program designed in Laboratory Virtual Instrument Engineering Workbench (LabVIEW) under variable operating conditions. The experimental waveforms were captured using the LabVIEW monitoring software. In order to carry out real time implementation, Code Composer Studio and SEEDXDS510plus Emulator are adopted to programming and testing with the DSP TMS320F2812. Experiments results show that the fuzzy PI regulator performs better than normal PI regulator, as fuzzy PI regulator indicates better waveforms of torque and speed responses during acceleration and deceleration, especially when the motor is operating on lower speeds.
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    Women in Higher Education Leadership and Parenthood: Experiences from a University in Zimbabwe
    (Springer Nature, 2021-02) Shava, G.N.; Chasokela, D.
    In Zimbabwe and most probably the rest of Africa, the occupational and leadership status of women in higher education leadership is still suffering a wide gap as there is unequal representation in leadership positions between men and women. Although women have made substantial gains in higher education learning institutions, they have not achieved parity with men. Women in Zimbabwe higher education are particularly underrepresented at higher levels of leadership and the percentage of female executives decline with increasing organizational rank. Despite the fact that women constitute the majority of workforce in universities in Zimbabwe, they remain poorly represented in high-level leadership positions. Where women have attained high-level leadership positions, they remain disadvantaged, their progress remain impeded due to parenthood responsibilities. Despite the fact that in Zimbabwe today women earn the majority of college and university degrees, they are less likely than men to experience benefits associated with leadership and promotion and they continue to represent a smaller proportion of leadership positions. This study derived from a qualitative case study undertaken at a university in Zimbabwe was conducted to establish challenges faced by women in higher education leadership. The research findings indicated that cultural and social barriers continue to grow and pose a formidable barrier to women in leadership positions. The researchers argue that organizational structures, parenthood and culture make it difficult for women to rise into higher levels in leadership positions.