Research articles (Dept of Electrical Engineering)
http://hdl.handle.net/10311/113
2024-03-28T22:39:25ZThe burden of HIV-related admissions and mortality at Princess Marina Hospital, Botswana in 2000: a pre-combination antiretroviral therapy era
http://hdl.handle.net/10311/1767
The burden of HIV-related admissions and mortality at Princess Marina Hospital, Botswana in 2000: a pre-combination antiretroviral therapy era
Molefi, Mooketsi; Tshikuka, Jose-Gaby; Monagen, Tuduetso Leka; Magafu, Mgaywa Gilbert Mjungu Damas; Masupe, Tiny; Mbongwe, Bontle; Rheeder, Paul
Background: human immune virus and acquired immunodeficiency syndrome (HIV/AIDS) have been recognized in Botswana for the last three decades, however, combination anti-retroviral therapy (cART) was only introduced
after 2000. Facility-based historical data of the burden of HIV/AIDSrelated conditions pre-cART have so far not been analyzed. Objective: To analyze the burden of HIV-related admissions and HIV-related deaths, and
identify the socio-demographic factors associated with HIV/AIDS deaths at Princess Marina Hospital (PMH) in the year 2000.
Methods: A retrospective review of medical files was carried out between May and June 2014. Nine thousand seven hundred and forty-six (9746) records were analyzed for the year for 2000. Cases were identified as documented HIV/AIDS as per medical notes and/or documentation of any of the conditions listed in sections B20-
B24 of the International Classification of Diseases (ICD 10 B20-B24). Outcomes were the percentages of HIV-related admissions and HIV-related deaths out of all admissions and deaths. The in-hospital case fatality rate (CFR) was also calculated. Log-binomial regression models were used to determine the most significant factors associated with HIV-related admission and death.
Results: The percentages of HIV-related admissions and HIV-related deaths were 4.1% (403/9746) and 11.3% (80/707), respectively. The in-hospital HIVCFR was 19.9% (80/403). Adjusted log-binomial models identified the most
2017-03-31T00:00:00ZApplication of the method of D-partitioning for stability of control systems with variable parameters
http://hdl.handle.net/10311/1063
Application of the method of D-partitioning for stability of control systems with variable parameters
Yanev, K.M.
By the turn of the century, Botswana will be 34 years old as an independent nation. Reflecting on the past, is a background of tremendous achievements from a socio-economic development perspective. The achievements could not have been possible if it was not for the contribution of the construction industry. The construction industry’s (CI) contribution to socio-economic development may be viewed from many areas, among them, creating employment, wealth and demand for manufactured goods, infrastructure and producing factors of production (e.g. office space, factory shells, roads, etc) for other sectors. However, the relationship between the general economy and the CI has not been established explicitly despite numerous studies. Using Botswana’s CI and the economy, some of the paradigms proposed in previous studies revisited.
2007-01-01T00:00:00ZDesign of automatic power factor control system
http://hdl.handle.net/10311/1062
Design of automatic power factor control system
Yanev, K.M.; Obok Opok, A.; Litchev, A.
Maintenance of the proper power factor is a very important matter for the industry and for the economy of any country. A study of the power factor value for a number of industrial plants in Botswana shows that they operate at power factors lower that the optimal values. If a plant power factor is different from its optimal value, this will cause considerable loses in terms of investments for large power generation and supply equipment and in terms of heat dissipation from the supply lines and other equipment. To improve the power factor and keep it at an optimal value, there are a number of preventative measures, as well as corrective actions that could be implemented. The power factor of a plant changes, depending on the number of electrical units operating at a time. After a full analysis of the power factor issue and its optimal case, are automatic control is designed that may maintain the power factor of a plant within values close to optimal. Similar automatic power factor control system can be introduced for all industrial plants with unsatisfactory power factor throughout the country that can improve considerably the efficiency of power utilization.
2004-01-01T00:00:00ZAn algorithm for the determination of feedback coefficients of a state variable feedback control system
http://hdl.handle.net/10311/756
An algorithm for the determination of feedback coefficients of a state variable feedback control system
Rao, M.V.C.
This paper describes a new method of determining the feedback coefficients in a state variable feedback system, given the closed loop transfer function, making use of the transfer function between different and relevant points in the feedback configuration used to realize the desired closed loop transfer function, formulas that can be repetitively used to determine the feedback coefficients are desired. The usefulness and simplicity of these methods are demostrated by illustrative examples where the plant has complex poles, coincident poles and zeros and even when the plant is unstable.
2000-01-01T00:00:00Z