In Suid-Afrika verskil onderwysers en leerders se moedertaal dikwels van die taal van leer en onderrig (Engels in dié studie). Aangesien hoërskoolonderwysers as vakspesialiste opgelei is, het hulle onvoldoende kundigheid om leerders by te staan om kerngeletterdheidsvaardighede in Engels te verwerf. Hierdie verkennende studie by ʼn plattelandse hoërskool het ten doel gehad om te bepaal wat die invloed van ʼn geletterdheidsintervensie op onderwysers in ʼn plattelandse skool se taal van onderrigpraktyke is. Die deelnemende aksienavorsingstudie het ʼn konstruktivistiese paradigma gevolg en is teoreties gerig deur die sosiale leerteorie. ʼn Geletterdheidsintervensie is ontwikkel vanuit die fonetiese beginsel en is geïmplementeer met ses doelgerig geselekteerde hoërskoolonderwysers (n=6, mans=1, vroue=5) in ʼn gerieflikheidsgeselekteerde plattelandse hoërskool wat al geruime tyd deel vorm van ʼn langtermyn studie oor veerkragtigheid in plattelandse skole. Data van onderwysers se taal van onderrigpraktyke is voor en na afloop van die geletterdheidsintervensie ingesamel aan die hand van twee fokusgroeponderhoude met die deelnemende onderwysers, asook observasies in twee klaskamers. Observasiedata is gedokumenteer as veldnotas, visuele data en oudio-opnames. Fokusgroeponderhoude is verbatim getranskribeer. Al hierdie databronne is tematies geanaliseer en die volgende temas is geїdentifiseer: onderwysers se persepsie van Engelse geletterdheid as kernvaardigheid vir leerders, die plek van hulpbronne in niemoedertaalonderrigpraktyke (in Engels) in plattelandse skole, die effek van ʼn geletterdheidsintervensie op onderwysers se tweede taal onderrigpraktyke (in Engels) en die profiel van deelnemende plattelandse onderwysers. Leer en onderrig in ʼn plattelandse hoërskool word bemoeilik deur hoërskoolleerders se onvermoë om te lees, die leerplanvereiste vir die gebruik van ʼn addisionele taal (soos Engels) as taal van leer en onderrig, gebrekkige opleiding van hoërskoolonderwysers rakende die aanleer van kerngeletterdheidvaardighede, beperkte hulpbronne en geografiese isolasie wat dit moeilik maak om indiensopleidingsgeleenthede te benut, Alhoewel die deelnemende plattelandse hoërskool se onderwysers nie opgelei was om leerders geletterdheidsvaardighede te leer nie, het dit geblyk dat hierdie onderwysers wel (i) weet welke kerngeletterdheidskernvaardighede deur leerders benodig word, (ii) gretig is om opgelei te word en positief is oor geletterdheidsintervensies, en (iii) naburige skole en onderwysers betrek in sulke kapasiteitsontwikkeling. Verder het dit geblyk dat die deelnemende plattelandse hoërskoolonderwysers hulle taal van onderrig en leerpraktyke kon aanpas nadat hulle aan ʼn geletterdheidsintervensie deelgeneem het. In dié verband het die onderwysers die volgende spesifieke strategieë gebruik, naamlik fisiese hulpbronne as ondersteuning vir die aanleer van nuwe klanke; taalvermenging; betrek leerders by die aanbieding van lesse, byvoorbeeld deur dramatisering; die implementering van ʼn leesperiode; en ook die benutting van die skool se mediasentrum. Hierdie gewysigde taal van onderrig en leerpraktyke het moontlik ʼn positiewe effek gehad op leerders se selfvertroue om in Engels betrokke te wees tydens leersituasies; hulle akademiese persentasies (in Engels) het ook verbeter. Onderwysers se ingesteldheid jeens leerders se motivering om te leer het ook verander. / Dissertation (MEd)--University of Pretoria, 2012. / Educational Psychology / unrestricted

AFRIKAANS: Voor 1994 was die skoolhoof aanspreeklik vir die beheer van die finansies van die skool. Met die instelling van die Suid-Afrikaanse Skolewet no. 84 van 1996 het die aanspreeklikheid vir skoolfinansies drasties verander deur die instelling van selfbestuur by skole. Daar bestaan tans groot onduidelikhede by departementele amptenare sowel as by skoolhoofde en skoolbeheerliggaamlede oor wie aanspreeklik vir die finansies van die skool is. Sommige skole se begrotings het sedert 1994 van `n paar honderd duisend rand tot `n paar miljoen rand toegeneem; meer personeel word aangestel wat deur die skoolbeheerliggaam vergoed word en dit alles plaas bykomende bestuurverantwoordelikhede op die skoolhoof. Dikwels is die skoolhoofde en skoolbeheerliggaamlede nie opgelei om hierdie bykomende finansiële lading te hanteer nie. Daar word van die skoolbestuurspan verwag om kennis van finansiële bestuur te hê om hulle taak effektief uit te voer, nie alleenlik vir hulle eie oorlewing nie maar ook tot die voordeel van die skool en die gemeenskap. Die doel van hierdie studie is om die vertrekpunte waarbinne skoolfinansies bestuur en beheer word, te bepaal, asook om aan die hand van kontrole- en beheermaatreëls te bepaal of begrotings aangewend word om onderrig en leer in openbare skole te bevorder. ENGLISH: Before 1994 the principal of a school was accountable for the control of the school`s finances. Since the introduction of the South African Schools Act no. 84 of 1996 and the implementation of self-management of schools, accountability for schoolfinances has changed dramatically. Some schools’ budgets have increased from a few hundred thousands of rand to millions of rand since 1994; more teachers are being appointed and paid by the school governing body; these developments increase the principal’s managerial responsibilities. Principals and school governing body members are often not qualified to shoulder this extra financial burden. It is expected of school managers to have knowledge of financial management to enable them to execute tasks effectively, not only for their own survival but also in the best interest of the school and the community. The purpose of this study is to identify the principles for the control and management of schools’ finances and also to establish whether budgets are managed in such a way that instruction and learning in public schools are propagated. / Thesis (PhD)--University of Pretoria, 2011. / Education Management and Policy Studies / unrestricted

Yes / Based on the common approach, the adaptation length in sediment transport is normally estimated in the temporal independence. However, this approach might not be theoretically justified as the process of reaching of the sediment transport equilibrium stage is affected by the flow conditions in time, especially for those fast sediment moving flows, such as scour-hole developing flow. In this study, the 2D shallow water formulation together with a sediment continuity-concentration (SCC) model were applied to flow with mobile sediment boundary. A time-varying approach was proposed to determine the sediment transport adaptation length to treat the flow sediment erosion-deposition rate. The proposed computational model was based on the Finite Volume (FV) method. The Monotone Upwind Scheme of Conservative Laws (MUSCL)-Hancock scheme was used with the Harten Lax van Leer-contact (HLLC) approximate Riemann solver to discretize the FV model. In the flow applications of this paper, a highly discontinuous dam-break fast sediment transport flow was used to calibrate the proposed time-varying sediment adaptation length model. Then the calibrated model was further applied to two separate experimental sediment transport flow applications documented in literature, i.e. a highly concentrated sediment transport flow in a wide alluvial channel and a sediment aggradation flow. Good agreements with the experimental data were presented by the proposed model simulations. The tests prove that the proposed model, which was calibrated by the discontinuous dam-break bed scouring flow, also performed well to represent the rapid bed change and the steady sediment mobility conditions. / The National Natural Science Foundation of China NSFC (Grant Number 20101311246), Major State Basic Research Development Program (973 program) of China (Grant Number 2013CB036402) and Open Fund of the State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University of China (Grant Number SKLH-OF-1103).

Graph databases with the property graph model are used in multiple domains including social networks, biology, and data integration. They provide schema-flexible storage for data of a different degree of a structure and support complex, expressive queries such as subgraph isomorphism queries. The exibility and expressiveness of graph databases make it difficult for the users to express queries correctly and can lead to unexpected query results, e.g. empty results. Therefore, we propose a relaxation approach for subgraph isomorphism queries that is able to automatically rewrite a graph query, such that the rewritten query is similar to the original query and returns a non-empty result set. In detail, we present relaxation operations applicable to a query, cardinality estimation heuristics, and strategies for prioritizing graph query elements to be relaxed. To determine the similarity between the original query and its relaxed variants, we propose a novel cardinality-based graph edit distance. The feasibility of our approach is shown by using real-world queries from the DBpedia query log.

No / Owing to unpredictable bed topography conditions in natural shallow flows, various numerical methods have been developed to improve the treatment of source terms in the shallow water equations. The surface gradient method is an attractive approach as it includes a numerically simple approach to model flows over topographically-varied channels. To further improve the performance of this method, this study deals with the numerical improvement of the shallow-flow source terms. The so-called surface gradient upwind method (SGUM) integrates the source term treatment in the inviscid discretization scheme. A finite volume model (FVM) with the monotonic upwind scheme for conservative laws is used. The Harten–Lax–van Leer-contact approximate Riemann solver is used to reconstruct the Riemann problem in the FVM. The proposed method is validated against published analytical, numerical, and experimental data, indicating that the SGUM is robust and treats the source terms in different flow conditions well.

The purpose of this study is to focus on constructing a modelling-based learning environment to improve learner performance in grade 6 mathematics classrooms. The purpose emanates from the continued poor performance of learners in mathematics at different school levels, especially grade 6. The teaching and learning of mathematics is explained from an ontological point of departure, focussing on constructivist paradigms. Different types of constructivism are discussed with special attention to the school mathematics domain. The learning, problem based learning, problem solving and learning environment are key components in the discussion. A theoretical perspective on the design of modelling as a powerful learning environment in primary schools mathematics classrooms is provided. Focus is placed on the applicability of the modelling-based learning environment on the South African mathematics curriculum and on study orientation as a key component to help develop an understanding of why learners perform or do not perform in mathematics. A mixed method research design, in which quantitative and qualitative are combined to achieve the outcomes of the research problem, is chosen for this research study project to provide a purposeful research framework. The findings of the research include not only learners’ improvement in dealing with non-routine, mathematical word problems but also in general-routine, mathematical word problems. A second finding shows that the overall SOM pre/post/retention showed good reliability, acceptable construct validity, good practical significance, and large effect but had low to medium effect in individual fields. The univariate analysis for the Crossover design used indicated that the problem solving field had statistical significance and practical significance, and the study milieu and mathematical confidence field might have statistical significance and practical significance. The third finding provided evidence concerning teacher administration, teacher and learner interaction, assessment and homework. The findings from the quantitative and qualitative data-analysis and interpretations, and literature review, guided the researcher in proposing a construct for a modelling-based learning environment as a means to improve learners’ mathematics performance in grade 6 mathematics classes in the John Toalo Gaetswe (JTG) District. The contribution that this study makes is to propose a construct for a modelling-based learning environment to improve learner performance in grade 6 mathematics. / PhD (Mathematics Education), North-West University, Potchefstroom Campus, 2014

School science education prepares learners to study science at a higher level, prepares them to follow a career in science and to become scientific literate citizens. It is the responsibility of the educator to ensure the learners’ conceptual framework is developed to the extent that secures success at higher level studies. The purpose of this study was to test the effectiveness of conceptual change teaching strategies on the conceptual development of grade 11 learners on Newton’s second law of motion. The two strategies employed were the cognitive conflict strategy and the development of ideas strategy. A sequential explanatory mixed-method research design was used during this study. The qualitative data were used to elucidate the quantitative findings. The quantitative research consisted of a quasi-experimental design consisting of a single-group pre-test–post-test method. During the qualitative part of the research a phenomenological research approach was utilised to gain a better understanding of participants’ learning experiences during the intervention. The quantitative research made use of an adapted version of the Force Concept Inventory (FCI). The data collected from the pre-test were used to inform the intervention. The intervention was videotaped and the video analysis or qualitative data analysis was done. After the intervention the post-test was written by the learners. Hake’s average normalised learning gain <g> from pre- to post-scores was analysed to establish the effectiveness of the intervention. The two sets of results (quantitative and qualitative) were integrated. Information from the qualitative data analysis was used to support and explain the quantitative data. The quantitative results indicate that there was an improvement in the students’ force conception from their initial alternative conceptions, such as that of an internal force. Especially the learners’ understanding of contact forces and Newton’s first law of motion yielded significant improvement. The qualitative data revealed that the understanding of Newton’s second law of motion by the learners who partook in this study did improve, since the learners immediately recognised the mistakes made when confronted with the anchor concept. The cognitive conflict teaching strategy was effective in establishing the anchor concept of force which proved to be useful as bridging concept in the development of ideas teaching strategy. The data from both datasets revealed that the cognitive conflict teaching strategy for the initial part of the intervention was effective. It was evident that for development of the idea teaching strategy the two data sets revealed mixed results. Recommendations were made for future research and implementation of conceptual development teaching strategies. / MEd (Natural Sciences Education), North-West University, Potchefstroom Campus, 2014

The purpose of this study is to focus on constructing a modelling-based learning environment to improve learner performance in grade 6 mathematics classrooms. The purpose emanates from the continued poor performance of learners in mathematics at different school levels, especially grade 6. The teaching and learning of mathematics is explained from an ontological point of departure, focussing on constructivist paradigms. Different types of constructivism are discussed with special attention to the school mathematics domain. The learning, problem based learning, problem solving and learning environment are key components in the discussion. A theoretical perspective on the design of modelling as a powerful learning environment in primary schools mathematics classrooms is provided. Focus is placed on the applicability of the modelling-based learning environment on the South African mathematics curriculum and on study orientation as a key component to help develop an understanding of why learners perform or do not perform in mathematics. A mixed method research design, in which quantitative and qualitative are combined to achieve the outcomes of the research problem, is chosen for this research study project to provide a purposeful research framework. The findings of the research include not only learners’ improvement in dealing with non-routine, mathematical word problems but also in general-routine, mathematical word problems. A second finding shows that the overall SOM pre/post/retention showed good reliability, acceptable construct validity, good practical significance, and large effect but had low to medium effect in individual fields. The univariate analysis for the Crossover design used indicated that the problem solving field had statistical significance and practical significance, and the study milieu and mathematical confidence field might have statistical significance and practical significance. The third finding provided evidence concerning teacher administration, teacher and learner interaction, assessment and homework. The findings from the quantitative and qualitative data-analysis and interpretations, and literature review, guided the researcher in proposing a construct for a modelling-based learning environment as a means to improve learners’ mathematics performance in grade 6 mathematics classes in the John Toalo Gaetswe (JTG) District. The contribution that this study makes is to propose a construct for a modelling-based learning environment to improve learner performance in grade 6 mathematics. / PhD (Mathematics Education), North-West University, Potchefstroom Campus, 2014

School science education prepares learners to study science at a higher level, prepares them to follow a career in science and to become scientific literate citizens. It is the responsibility of the educator to ensure the learners’ conceptual framework is developed to the extent that secures success at higher level studies. The purpose of this study was to test the effectiveness of conceptual change teaching strategies on the conceptual development of grade 11 learners on Newton’s second law of motion. The two strategies employed were the cognitive conflict strategy and the development of ideas strategy. A sequential explanatory mixed-method research design was used during this study. The qualitative data were used to elucidate the quantitative findings. The quantitative research consisted of a quasi-experimental design consisting of a single-group pre-test–post-test method. During the qualitative part of the research a phenomenological research approach was utilised to gain a better understanding of participants’ learning experiences during the intervention. The quantitative research made use of an adapted version of the Force Concept Inventory (FCI). The data collected from the pre-test were used to inform the intervention. The intervention was videotaped and the video analysis or qualitative data analysis was done. After the intervention the post-test was written by the learners. Hake’s average normalised learning gain <g> from pre- to post-scores was analysed to establish the effectiveness of the intervention. The two sets of results (quantitative and qualitative) were integrated. Information from the qualitative data analysis was used to support and explain the quantitative data. The quantitative results indicate that there was an improvement in the students’ force conception from their initial alternative conceptions, such as that of an internal force. Especially the learners’ understanding of contact forces and Newton’s first law of motion yielded significant improvement. The qualitative data revealed that the understanding of Newton’s second law of motion by the learners who partook in this study did improve, since the learners immediately recognised the mistakes made when confronted with the anchor concept. The cognitive conflict teaching strategy was effective in establishing the anchor concept of force which proved to be useful as bridging concept in the development of ideas teaching strategy. The data from both datasets revealed that the cognitive conflict teaching strategy for the initial part of the intervention was effective. It was evident that for development of the idea teaching strategy the two data sets revealed mixed results. Recommendations were made for future research and implementation of conceptual development teaching strategies. / MEd (Natural Sciences Education), North-West University, Potchefstroom Campus, 2014

North-West University in South Africa is committed to expanding use of learning technologies for contact and distance education students by augmenting the existing NWU teaching and learning policy with an e-learning policy. The School of Continuing Teacher Education at North-West University is currently training about 24 000 in-service teacher students through Open Distance Learning. Only a few students submit assignments in typed format and seldom electronically. Students rarely use electronic technologies to augment their learning, and the SCTE employs few to support students. This does not comply with the South African Government’s policy on e-Education that demands information and communication technology mastery in teacher training. The aim of this research was integration of learning technologies in open distance learning at SCTE NWU through recommendations compiled in a sociologically transformative emergent implementation framework. The researcher followed a concurrent mixed-method sociologically transformative approach, focussing on the use of technology for social empowerment to cross the digital divide, through a theoretical lens of ICT for development. The lived experience in the natural setting of distance education students, lecturers, and involved stakeholders was used as initial data collection, informed by a continuous literature study of emergent learning technology use. Purposeful sampling was used during participant selection. The role of the researcher was that of participant observer, interviewer, and human instrument, from a position of methodological pragmatism as a method of inquiry. Using a design-based research approach, the thesis addresses the main research question through five research papers; each addressing one of the sub-questions as design-based research cycles, while collectively addressing the research problem to address the main research question. Nonstandardised measuring instruments were developed based on themes identified from literature and the analysis of qualitative data. Significant barriers to population-wide ICT adoption exist. Strong intentions of perseverance in attaining functional computer literacy are evident. Support and enablement are required to promote trust to attempt using computers, necessary to obtain self-confidence through accomplishment. In this way perseverance to attain functional computer literacy may be cultivated. The study presents a model for intention to use, confidence, trust and perseverance in attaining computer literacy competence with statistically significant standardised regression weights. In terms of affective responses of students during computer literacy training, a twodimensional model for computer literacy learning emotions is presented. Perceptions during professional development produced a model for faculty development towards socially transformative learning technology integration for open distance learning. The researcher also presents a people-technology interaction in teaching and learning model in the fifth paper. A distinction is made between reactionary interventions and pre-emptive unobtrusive seamless support, based on requirements identified through bottom-up feedback listening to latent requests of participants. Technology-enhanced learning integration should be legitimised through visible commitment from the university as institution. Lecturer training, innovative planning of time issues, acquisition of appropriate infrastructure, buying in from the institution and IT support services, and support of teacher-students are all essential for evolvement towards an e-mature organisation for the delivery of ODL to vast numbers of newly industrialised context clients. / Thesis (PhD (Curriculum Development Innovation and Evaluation))--North-West University, Potchefstroom Campus, 2013