An evaluation of social team building intervention on MBA group formation
- Authors: Westraadt, Johan Ewald
- Date: 2019
- Subjects: Team learning approach in education , Business Administration -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/45679 , vital:38926
- Description: Teamwork and the ability to work effectively in a team is a critical skill in a technologically complex workplace where no individual can possess all the knowledge and skills. MBA programmes, therefore, require students to work in collaborative learning groups in order to not only share their knowledge and skills, but also to develop the needed team-based competencies. However, collaborative learning groups are prone to many pitfalls that could result in intra-group conflict and inefficiencies such as social loafing, where the group performance is less than the sum of the output of the individual members when working alone. Team development interventions (TDI) aim to improve team-based competencies of a team. One type of TDI that is often employed is social team building. It typically consists of a one-day extra-mural excursion involving some non-work-related tasks performed by teams to improve interpersonal relationships. The MBA groups are pre-allocated at the start of the academic programme and team building interventions are therefore needed to facilitate group formation. The main research question in this study deals with the effectiveness of these social team building TDI’s to promote group formation. The literature of teams and the factors that influence team effectivity were reviewed. Input-Process-Output models relate the factors that drive team performance. Three team viability measures critical to a teams’ performance were identified namely, group cohesion, group communication and goal-setting. There is strong empirical evidence that these factors contribute positively to the performance of the team. The influence of team building interventions on each of these factors were discussed. There is empirical evidence for the impact of team building interventions on these affective outcomes. However, empirical evidence for the link to objective performance measures is still lacking
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- Date Issued: 2019
Thermal degradation of diamond compacts: a TEM investigation
- Authors: Westraadt, Johan Ewald
- Date: 2011
- Subjects: Materials -- Thermal properties Chemical weathering
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/10829 , vital:26827
- Description: Diamond compacts consist of fine diamond grains bonded together by using high pressure and high temperature. In this study transmission electron microscopy (TEM)was used to study thermal degradation of diamond compacts. Three different types of diamond compacts – namely cobalt polycrystalline diamond (PCD), calcium carbonate PCD, and diamond-SiC composites – were investigated with TEM to understand the processes that occur during synthesis. These compacts were then heated in inert atmospheres and the chemical changes studied with TEM. It was found that PCD, using cobalt as a bonding agent, will degrade after exposure to temperatures above 750ºC. The cobalt pools contain tungsten in solid solution. During heat treatment above 700ºC the solid solution tungsten combines with cobalt and dissolved carbon to form η-phase particles at the cobalt/diamond interface. At higher temperatures or insufficient tungsten levels the rate of dissolved carbon, into the cobalt pool, is too high and the excess carbon will form as graphite in the cobalt pool. Increased levels of solid solution tungsten, in the cobalt, is expected to delay the onset of graphitization in the diamond compact, thereby increasing the thermal stability of the diamond compact. Non-metallic PCD using calcium carbonate as a bonding agent was successfully sintered in this study. TEM revealed similar micro-structural features as in cobalt based PCD. No signs of thermal degradation were found after exposure to 1200ºC in vacuum for this PCD. Contaminants introduced during processing prevented a detailed study of the binder in this system. The effect of substitutional metal atoms and plastic deformation of diamond on the thermal stability of diamond-SiC composites were investigated. A piston cylinder press was developed and used to synthesize diamond-SiC composites with different levels of plastically deformed diamond. It was concluded that substitutional metal atoms and plastic deformation of diamond grains play no role in the thermal degradation of diamond compacts at 750ºC. The thermal degradation of cobalt PCD is therefore completely determined by the cobalt/diamond interaction at 750ºC.
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- Date Issued: 2011