Тепловая экономичность привода питательных насосов электростанций

In the production of micro devices the surface properties become more and more important for chemistry, biotechnology and medical technology with respect to wetting properties and chemical composition of the surface. Typical applications are implants as well as micro fluidic systems or miniaturized devices for DNA- and proteome analysis (biochips). In this paper newly designed laser technologies based on UV-laser treatment of polymers for surface processing are described to manipulate wetting properties, cell growth and immobilization of functional molecules with high spatial resolution. Depending on the processing parameters and used polymers either hydrophobic or hydrophilic properties can be enhanced (i.e. laser induced lotus/anti-lotus effect). Enhanced roughness and changes of the chemical composition have also influence on cell growth on polymer surfaces. Thus guiding aids for cells e.g. on medical implants can be generated by laser irradiation. Due to photo oxidation processes while UV-treatment in air, functional groups are created that are suited for covalent bonding of (bio)moelcules onto the surfaces. A second process for the locally selective immobilization of anchor molecules based on azide functionalized templates suitable for further modification steps is presented by means of irradiating polymers under solutions of these linkers

Secondary school teachers experiences of implementing a sexuality education programme in the life orientation learning area in Mpumalanga

The child needs to be introduced to all facets of being an adult, whether a woman or a man. For this to be done a planned and organised education should be done. If a child is inadequately educated in this regard life will remain alien and closed, and despite all the opportunities, she or he might never become fully actualised as a man or a woman. Sexuality Education is therefore aimed at helping learners at school to develop a positive view of sexuality, providing them with the necessary information, clarify values and the necessary social skills to make wise and to make wise and informed decisions about all matters relating to their sexuality. Promotion of a healthy personal life-style for learners, they are enabled to be morally independent, accountable, dedicated and responsible adults, all are learnt in Sexuality Education. Teachers and parents play an important role in guiding the learners towards adulthood, according to the values and norms of the society. Parental involvement in sexuality education is essential, but in the modern context parents are seemingly not able to cope with the responsibility due to a number of social and economic issues. Much of the education is left to the schools and responsibility is placed particularly on Life Orientation teachers to respond to this educational imperative. In-service teachers receive training in Sexuality Education in the Life Orientation learning area by way of in-service training workshops to support them in this role. It is, however documented that ”although Sexuality Education programmes have been around for many years, most programmes have not been as effective as hoped” (Edwards, 1998). This raises a question as to whether in-service teachers who are trained in a particular Sexuality Education programme in a certain region in Mpumalanga are indeed implementing it as was intended in the training. In order to partly answer this question, this study will therefore focus on secondary school teachers’ experiences of implementing this particular Sexuality Education programme.Dr. M.P. Van der Merw

The effectiveness of polyethylene glycol (PEG) and polyvinyl polypyrrolidone (PVPP) on removal of tannins from leaf extracts of selected medicinal plants in Limpopo Province

Five selected plant species (Balanites maughamii, Breonadia salicina, Dombeya rotundifolia, Hyperacanthus amoenus and Piliostigma thonningii) were extracted using 70 and 100% acetone and the presence of tannins were determined using radial diffusion assay. Our comparative assessment indicated that plant extracted with 100% acetone showed the highest levels of tannins as compared to 70% acetone. The highest tannin levels in both 70 and 100% acetone extracts were recorded for P. thonningii, while no tannins were detected in B. maughamii. However, addition of polyethylene glycol (PEG) and polyvinyl polypyrrolidone (PVPP) to the extraction media resulted in the reduction of tannins in all crude plant extracts, with PEG being more effective than PVPP. 1% PEG removed the highest quantity of tannins in all plant extracts, in comparison with 0.5% PEG (63.3%) and 0.5 and 1% PVPP (24.8 and 49.4%, respectively).Key words: Acetone, tannin, polyethylene glycol (PEG), polyvinyl polypyrrolidone (PVPP)

The Use of digital project management solutions by project businesses: a case study of a selected platinum mine in the Limpopo province

There have been specific technological shifts globally in the discipline of project management, which include the implementation of Project Management Software (PMS) packages. PMS is a pliant software solution that is used for managing projects: administrating, planning, organising, resources managing, document managing, costs, and time management. The awareness and adoption of PMS is unclear, especially in developing countries. This study has examined the awareness and adoption levels of digital project management solutions by project businesses at a selected opencast platinum mine in the Limpopo Province. The study also investigated project management challenges, and the impediments of adoption and the readiness of project businesses to adopt digital project management solutions. A quantitative research survey was distributed and emailed to project businesses at mine, where 110 project businesspersons participated in this study. SPSS v26.0 software was utilised to process data.The study publicised that the level of awareness of digital project management tools is higher than the level of adoption. Several barriers were identified as the impediments of adopting digital project management tools. It is recommended in the study that PMS developers should consider integrating with other systems that could enhance project management processes. It is also recommended that they should consider creating different packages for all business sizes and project magnitudes

Hybrid communities of practice towards developing educators’ TPACK: Implications for teacher education

Although widely acknowledged for their significance, contemporary Teacher Professional Development (TPD) initiatives have faced growing criticism due to their failure to effectively foster the seamless incorporation of technology into educators’ pedagogical practices. Educators depend on their informal Communities of Practice (CoPs) rather than TPD programmes to acquire the knowledge they need to both competently and meaningfully integrate technology into their pedagogical practices. This study investigates the innovative approaches educators employ in three (n=3) Western Cape public primary schools to create a hybrid CoP in their school to improve their collective technological, pedagogical, and content knowledge (TPACK). The criticism of TPD efforts extends beyond primary and secondary school contexts. This challenge substantially impacts teacher education and highlights the increasing necessity for developing digital literacy among the professoriate in this discipline. The theoretical basis for this study was Wenger’s (1998) CoP social learning theory and Mishra and Koehler’s (2006) TPACK model. The study employed a qualitative research approach involving a cohort of 12 educators who engaged in open-ended survey questionnaires, one-on-one semi-structured interviews, and observational sessions. Additionally, the research incorporated one (n=1) school principal and two (n=2) deputy principals who actively contributed to all data collection modalities except for the survey questionnaires. Document analysis, specifically from WhatsApp group chat screenshots, was conducted across all three (n=3) schools as part of the research approach. While the data set used in this study originates from a study involving school educators, it aims to extend the findings to determine their significance for teacher education. The results revealed that the sampled educators had established an informal hybrid CoP at their respective schools through innovative approaches, such as joint enterprise, mutual engagement, and shared repertoire. These educators gained TPACK from one another throughout this process. Universities and provincial governments might profit from the findings, the knowledge gained from which could assist in their structuring of TPD programmes in ways which would foster their organic development in educators’ particular employment contexts

Experiences of learning support teachers in the foundation phase, with reference to the implementation of inclusive education in Gauteng

The policy of Inclusive Education (IE) in White Paper 6 (2001) acknowledges that all children can learn with support. The aim of this study is to explore the experiences of Learning Support Teachers (LSTs) in supporting Foundation Phase teachers in implementing Inclusive Education (IE) in Gauteng Province, South Africa. A lack of support for teachers and learners in IE has dominated current discussions on education. According to the Department of Education (DoE, 2000:28), the establishment of an IE system in schools would require appropriate district as well as institution level support services, and more than just accepting learners with different learning needs in mainstream classrooms. Many teachers have not had the benefit of being trained to teach learners who experience barriers to learning, hence most find it difficult. Although specialist teachers in the form of Learning Support Teachers (LSTs) have been employed in the Foundation Phase to fill that gap and assist classroom teachers, the learners are not receiving the assistance hoped for. Based on an assumption that the failings may largely be systemic, this study therefore uses Bronfenbrenner’s ecological systems theory and a qualitative research design to examine the implementation of IE in selected schools, with seven LSTs being interviewed and observed, while documents pertaining to the support rendered were analysed. Seven principals and seven classroom teachers were also interviewed. The analysis employed Creswell’s method and the findings highlighted factors affecting the implementation of IE. The factors include inadequate district support, socio-cultural issues, classroom and management factors, lack of resources and inadequate collaboration between the stakeholders. The study makes recommendations and suggests further areas of research.D. Ed. (Inclusive Education)Inclusive Educatio

Antibacterial activity of selected plants used in ethnoveterinary medicine

Thesis (M.Sc. (Agriculture)) --University of Limpopo, 2006Refer to documentNational Research Foundation (NRF) and Cannon Collins Educational Trust Fund of Southern Africa (CCETSA