Browsing by Author "Marwanga, Reuben O"

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    Influence of graphite morphology, matrix structure on gray iron machining
    (2000) Marwanga, Reuben O; Robert, C. Voigt; Paul, H. Cohen
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    Providing Home-based Care Using Text Messaging
    (2011) Sowon, Karen; Marwanga, Reuben O
    Th e i ncreasing miniaturization of mobile devices marks an important opportunity for the next generation health care delivery. Mobile health (mHea lth), existing at the nexus of health and technology provides a singular opportunity to take health where it is needed the most. Having had nearly mainstream adoption, may explain why the developed world is in tandem with health-related Millennium Development Goals (MDGs). On the other hand, developing countries still lag behind in meeting the same health-related goals, yet they continue to report successful stories of mobile technology growth and adoption but no major usage of the same to deliver healthcare. This resear ch sought to explore existing mHealth applications to establish their suitability for use in developing countries such as Kenya to provide home-based care. This was done by a survey of existing literature and mHealth models, and an architecture developed in light of local communication infrastructure and local mobile phone abilities. It was established that for developing countries to take advantage of this leapfrogging technology in health, they would have to take advantage of the Short Message Service (SMS) that is cheap and accessible to all. A relationship amongst mHealth stakeholders was considered as key to enhancing the adoption of mHealth in such countries
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    Quality improvement through microstructure control for superior machinability of cast irons
    (1998) Marwanga, Reuben O
    The purpose of this research was to study the influence of microstructure on chip formation and other machinability criteria for cast irons. It is recognized that machinability of cast irons is influenced by a complex interplay of graphite morphology and matrix structure. However, the effect of these microstructural variables on the measures of machinability of cast irons has not been adequately investigated. As a consequence the problem of variability in the machinability of this group of materials is not well understood. In this study, slow speed machining and the quick-stop device method were used to investigate the mechanism by which graphite morphology and the matrix structure influence the machining properties of cast irons. Furthermore, turning tests were used to study machinability as characterized by tool life, machining forces and surface roughness for these materials. Relationships between chip formation and other machinability criteria were then developed and analyzed. Finally, empirical models that relate machinability to microstructures for cast irons were developed. The study showed that chip formation and other machinability parameters for cast irons were influenced by both graphite morphology and matrix structure. In addition, the empirical models revealed that machinability of cast irons was not only influenced by microstructural variables but also by the interaction of the variables with cutting conditions.