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Efficiency evaluation of South Africa tertiary education institutions using data envelopment analysis

- Chitekedza, Ignatious

Authors: Chitekedza, Ignatious
Date: 2015
Subjects: Data envelopment analysis -- South Africa , Principal components analysis
Language: English
Type: Thesis , Masters , MSc
Identifier: http://hdl.handle.net/10948/4764 , vital:20674
Description: With an increasing number of students enrolling at higher education institutions in South Africa, it has become important to investigate whether these institutions are using their resources adequately. This study uses data envelopment analysis (DEA) to estimate the efficiency of 23 South African tertiary education institutions based on both teaching and research outputs. Using DEA we are able to rank South African universities according to their use of resources in these two areas. These rankings can identify institutions which are performing well and also those which require improvement. The effect that merging institutions has on this efficiency is also determined. Owing to the limited sample size, variable reduction techniques, including the efficiency contribution measure (ECM) and principal components analysis (PCA-DEA), were used to improve the discrimination of the analysis.
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Date Issued: 2015

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Electrical-static discharge in single point diamond turning machining of contact lens polymers

- Kadermani, Mohamed Munir

Authors: Kadermani, Mohamed Munir
Date: 2015
Subjects: Electric discharges , Electrostatics , Contact lenses , Polymers
Language: English
Type: Thesis , Masters , MEngineering (Mechatronics)
Identifier: http://hdl.handle.net/10948/4055 , vital:20508
Description: Single Point Diamond Turning (SPDT) is a technology widely applied for the fabrication of contact lenses. One of the limiting factors in polymer machining is wear of the diamond tool due to electrostatic discharge resulting in poor surface quality of the machined products. The research work presented in this dissertation highlights the electrostatic properties of contact lenses during machining operations and the effects these properties have on the surface quality of the work piece materials. Two contact lens samples were experimented on, Definitive 74 (Silicone Hydrogel) and Tyro 97 (Rigid Gas Permeable). The electrostatic surface potentials (ESPs) were measured during turning operations using an electrostatic voltmeter and the surface roughness measurements were taken using a surface profilometer. Response Surface Methodology (RSM) techniques were employed to create predictive models for both surface roughness and ESPs with respect to the cutting speed, feed rate and depth of cut. Predictive surface roughness models were successfully generated for both materials and the cutting speed and feed rate were identified as the parameters with most effect on surface roughness. In addition, an electrostatic model was successfully generated for the Definitive 74 contact lens material which cited the cutting speed and feed rate as the most effective parameters on the material’s electrostatic behaviour. However, no relationship was evident between the machining parameters and electrostatic behaviour of Tyro 97.
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Date Issued: 2015

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Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

- Maringa, Audacity, Mashazi, Philani N, Nyokong, Tebello

Authors: Maringa, Audacity , Mashazi, Philani N , Nyokong, Tebello
Date: 2015
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/189719 , vital:44925 , xlink:href="https://doi.org/10.1016/j.jcis.2014.10.056"
Description: Au and Pd nanoparticles were individually or together electrodeposited on top of polymerized cobalt tetraaminophthalocyanine (poly-CoTAPc). When Pd and Au nanoparticles are co-deposited together, the electrode is denoted as Au–Pd (co-deposited)/poly-CoTAPc-GCE. X-ray photoelectron spectroscopy (XPS) was used to show the successful deposition of AuNPs, PdNPs and Au–Pd (co-deposited). The scanning electrochemical microscopy showed that Au–Pd (co-deposited)/poly-CoTAPc-GCE (with current range of 9.5–13.5 lA) was more conducting than Au–Pd (co-deposited)-GCE (with current range of 8–12 lA). Electrochemical impedance spectroscopy (EIS) showed that there was less resistance to charge transfer for Au–Pd (co-deposited)/poly-CoTAPc-GCE compared to the rest of the electrodes. Au–Pd (co-deposited)/poly-CoTAPc-GCE showed the best activity for the electrooxidation of hydrazine in terms of limit of detection (0.5 lM), hence shows promise as an electrocatalyst for electrooxidation of hydrazine.
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Date Issued: 2015

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Electrocatalytic studies of covalently immobilized metal tetra-amino phthalocyanines onto derivatized screen-printed gold electrodes

- Mashazi, Philani N, Nyokong, Tebello

Authors: Mashazi, Philani N , Nyokong, Tebello
Date: 2015
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/249059 , vital:51774 , xlink:href="https://doi.org/10.1007/s00604-010-0438-6"
Description: Metal tetra-amino phthalocyanine complexes (MTAPc; where M is Co or Mn) were immobilized on screen-printed gold electrodes pre-modified with monolayers of benzylamino groups. The functionalized electrodes were then activated using benzene-1,4-dicarbaldehyde as a linker before MTAPc complexes were immobilized. The surface coverages for the modified electrodes confirmed the perpendicular orientation of the MTAPcs. The apparent electron transfer constant (kapp) for the electrodes is 2.2 × 10−5 cm.s−1 for both CoTAPc and MnTAPc modified electrodes as calculated with data from impedance measurements. The kapp values for the bare and benzylamino modified electrodes were found to be 1.2 × 10−4 cm.s−1 and 4.9 × 10−6 cm.s−1, respectively. The electrocatalysis of the modified electrodes towards detection of H2O2 gave significant peak current densities and electrocatalytic potentials at −0.28 V and −0.31 V for the MnTAPc and CoTAPc modified electrodes, respectively.
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Date Issued: 2015

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Electrode modification using alkynyl substituted Fe (II) phthalocyanine via electrografting and click chemistry for electrocatalysis

- Nxele, Siphesihle R, Mashazi, Philani N, Nyokong, Tebello

Authors: Nxele, Siphesihle R , Mashazi, Philani N , Nyokong, Tebello
Date: 2015
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/189296 , vital:44835 , xlink:href="https://doi.org/10.1002/elan.201500212"
Description: In this work, tetrakis(5-hexyn-oxy)Fe(II) phthalocyanine was synthesised in order to perform a click reaction between the terminal alkyne groups and an azide group on a glassy carbon electrode (GCE) surface. An azide group was formed on the electrode surface following electrografting using 4-azidobenzene diazonium tetrafluoroborate by electrochemical reduction. The Cu(I) catalyzed alkyne-azide Huisgen cycloaddition reaction was then employed in order to react the terminal alkyne groups on the phthalocyanine with the azide groups on the GCE surface. The modified electrode was employed to catalyse the oxidation of hydrazine. The electrode showed good electrocatalytic ability towards the detection of hydrazine with a sensitivity of 15.38 µA mM−1 and a limit of detection of 1.09 µM.
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Date Issued: 2015

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Electrode surface modification using metallophthalocyanines and metal nanoparticles : electrocatalytic activity

- Maringa, Audacity

Authors: Maringa, Audacity
Date: 2015
Subjects: Phthalocyanines , Nanoparticles , Electrocatalysis , Scanning electron microscopy , X-ray photoelectron spectroscopy , Electrochemistry , Scanning electrochemical microscopy
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:4541 , http://hdl.handle.net/10962/d1017921
Description: Metallophthalocyanines and metal nanoparticles were successfully synthesized and applied for the electrooxidation of amitrole, nitrite and hydrazine individually or when employed together. The synthesized materials were characterized using the following techniques: predominantly scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemistry and scanning electrochemical microscopy (SECM). Different electrode modification methods were used to modify the glassy carbon substrates. The methods include adsorption, electrodeposition, electropolymerization and click chemistry. Modifying the glassy carbon substrate with MPc (electropolymerization) followed by metal nanoparticles (electrodeposition) or vice versa, made a hybrid modified surface that had efficient electron transfer. This was confirmed by electrochemical impedance studies with voltammetry measurements having lower detection potentials for the analytes. This work also describes for the first time the micropatterning of the glassy carbon substrate using the SECM tip. The substrate was electrografted with 4-azidobenzenediazonium salt and then the click reaction was performed using ethynylferrocene facilitated by Cu⁺ produced at the SECM tip. The SECM imaging was then used to show the clicked spot.
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Date Issued: 2015

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Eliciting and combining expert opinion : an overview and comparison of methods

- Chinyamakobvu, Mutsa Carole

Authors: Chinyamakobvu, Mutsa Carole
Date: 2015
Subjects: Decision making -- Statistical methods , Expertise , Bayesian statistical decision theory , Statistical decision , Delphi method , Paired comparisons (Statistics)
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:5579 , http://hdl.handle.net/10962/d1017827
Description: Decision makers have long relied on experts to inform their decision making. Expert judgment analysis is a way to elicit and combine the opinions of a group of experts to facilitate decision making. The use of expert judgment is most appropriate when there is a lack of data for obtaining reasonable statistical results. The experts are asked for advice by one or more decision makers who face a specific real decision problem. The decision makers are outside the group of experts and are jointly responsible and accountable for the decision and committed to finding solutions that everyone can live with. The emphasis is on the decision makers learning from the experts. The focus of this thesis is an overview and comparison of the various elicitation and combination methods available. These include the traditional committee method, the Delphi method, the paired comparisons method, the negative exponential model, Cooke’s classical model, the histogram technique, using the Dirichlet distribution in the case of a set of uncertain proportions which must sum to one, and the employment of overfitting. The supra Bayes approach, the determination of weights for the experts, and combining the opinions of experts where each opinion is associated with a confidence level that represents the expert’s conviction of his own judgment are also considered.
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Date Issued: 2015

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Employing safe bets: reflections on attracting, developing and retaining the next generation of academics

- Hlengwa, Amanda I

Authors: Hlengwa, Amanda I
Date: 2015
Language: English
Type: text , book
Identifier: http://hdl.handle.net/10962/142145 , vital:38053 , ISBN 9781869142902 , https://books.google.co.za/books?id=49o8rgEACAAJanddq=Being+at+home:+Race,+institutional+culture+and+transformation+at+South+African+higher+education+institutionandhl=enandsa=Xandved=0ahUKEwiPgsa6mpjjAhXNN8AKHbNwAtoQ6AEIKDAA
Description: This edited work has gathered together contributions on how to transform universities in South Africa; as many are struggling to shift their institutional culture. In a South African context, transformation means to attempt to change higher education institutions such that they no longer reflect the values promoted by apartheid but rather reflect the values embodied in South Africa's 1996 Constitution. Institutional culture is the main subject for discussion in this book. In order to transform South Africa's universities, the contributors begin by analyzing the idea of what a university is, and relatedly, what its ideal aims are. A second theme is to understand what institutional culture is and how it functions. Moreover, transformation cannot occur without transforming the broader cultures of which they are a part. Related to this theme is a general concern about how contemporary moves towards the instrumentalization of higher education affect the ability to transform institutions. These institutions are being pushed to conform to goals that are outside the traditional idea of a university, such as concerns that universities are being 'bureaucratized' and becoming corporations, instead of a place of learning open to all. In conclusion it can be said that the contemporary South African academic community has an opportunity to recreate itself as the end of apartheid created space for engaging in transformative epistemic projects. The transformation of the tertiary sector entails a transformation of institutional cultures.
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Date Issued: 2015

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Empowerment of school governing bodies in selected schools, King William's Town education district

- Ronoti, Zamikhaya Sydwell

Authors: Ronoti, Zamikhaya Sydwell
Date: 2015
Subjects: School boards -- South Africa -- Eastern Cape , School board members -- Training of -- South Africa -- Eastern Cape , School management and organization -- South Africa -- Eastern Cape
Language: English
Type: Thesis , Masters , MPA
Identifier: http://hdl.handle.net/10948/6585 , vital:21120
Description: This study investigates the impact of school governing bodies (SGBs) empowerment on school governance in King William’s Town. The study focuses on SGBs challenges and plights, highlights the effects of their lack of empowerment and suggests the review of the election criteria used to elect SGBs who have the potential to be empowered. Furthermore, it explores the elements and methods of empowerment that can be utilised to empower SGBs and examines the difficulties SGBs experience in accounting for finances and formulating and implementing policies. The researcher makes recommendations on the empowerment of SGBs based on the findings of the study. It was necessary to review literature on empowerment and school governance to attain the research goals. Conflicts and the mismanagement of finances indicate a noticeable gap between South African Schools Act policy intention and policy practice. The majority of SGBs, particularly the parent component in rural and semi-urban areas, have low levels of education. As a result, it is difficult to empower members because they have little or no basic knowledge, skills and expertise with regard to school governance. The manner in which SGBs function and carry out their duties, roles and responsibilities indicates that SGBs received inadequate training. SGBs lack awareness of the regulations governing the appointment of educators, hence a number of disputes arise. The increasing number of disputes (both formal and informal) in respect of appointments and promotions results from misinterpretations of or variations in legislation governing appointments in schools as well as the competency or capacity of SGBs. To investigate this problem, interviews were used as the research instrument to gather data from eight participants from selected schools. The main finding is that the majority of the SGBs studied are incapable of being empowered due to low illiteracy levels of some members. Low levels of or no education, a lack of basic knowledge and skills and other factors, such as a lack of educational insight and the inaccessibility of information and resources due to the use of English as the medium in which SGBs are serviced, compound the problem. The quality of the empowerment workshops, which are 'one size fits all', have a marked effect on their efficiency.
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Date Issued: 2015

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Enablers for lean process sustainability within South African manufacturing industries

- Roth, Benlloyd Koekemoer

Authors: Roth, Benlloyd Koekemoer
Date: 2015
Subjects: Lean manufacturing , Manufacturing processes , Process control
Language: English
Type: Thesis , Masters , MBA
Identifier: http://hdl.handle.net/10948/6591 , vital:21122
Description: James Womack and his colleagues Daniel Jones and Daniel Roos changed the way western civilization approached manufacturing. In 1990, they published a book called ‘The Machine That Changed the World: The Story of Lean Production’. It was a concept that had slowly filtered from the east but had not made its mark on the manufacturing sector. The concept of lean, born out of the Japanese Toyota Manufacturing System, was first thought to be impossible to duplicate outside of Japan. Since Womack and company popularised this “new” way of producing goods and delivering services it spread across industries finding popularity in the medical, engineering, accounting and especially the manufacturing industries. Over the last few decades lean practices has been synonymous with efficiency, cost reduction, supply chain optimisation and innovative problem solving (Anvari Norzima, Rosnah, Hojjati and Ismail, 2010; Pieterse et al., 2010; Womack et al., 1990). Lean process implementation has been researched in abundance, as has failed attempts at lean implementation. The purpose of this study was to identify and assess enablers of lean sustainability in organisations where lean processes are already being implemented. The literature study found Organisational Culture, Leadership, Employee Engagement and Trade Unions participation as factors that contributed to successful lean implementations. The author developed a model to test Organisational Culture, Leadership, Employee Engagement and Trade Unions as enablers to sustain lean practices in organisations in South Africa’s manufacturing industries. The results proved that Organisational Culture, Leadership and Employee Engagement were considered enablers for lean sustainability. These three enablers have an interlinked relationship and together help sustainability. Lacking just one factor would surely result in unsustainable lean practices. The study was conducted in the quantitative paradigm, as the hypothesised relationship was statistically tested. The data was collected from a homogenous group via an email sent with a link to the questionnaire. The data was statistically analysed with Statistica software and Microsoft Excel.
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Date Issued: 2015

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Enabling and constraining factors in Zimbabwe's 3-3-3 teacher education curriculum model : the case of a secondary teacher education college

- Shava, Nosizo

Authors: Shava, Nosizo
Date: 2015
Subjects: Education -- Curricula -- Zimbabwe Teacher participation in curriculum planning -- Zimbabwe Teachers -- Training of -- Zimbabwe
Language: English
Type: Thesis , Doctoral , PhD
Identifier: http://hdl.handle.net/10353/5686 , vital:29362
Description: This study offers an explanation of enabling and / or constraining factors in Zimbabwe‘s 3-3-3 secondary teacher education model for Post ‗O‘ Level Science. It is a theory driven study that derives its theoretical foundation from Roy Bhaskar‘s critical realism and Margaret Archer‘s morphogenetic approach to reality. The study therefore offers explanations about structural, cultural and agential influences that facilitate and / or hinder the 3-year program for Post ‗O‘ Level Science. This was a qualitative case study of one secondary teacher education college in Zimbabwe. Qualitative data were collected through interviews, focus group discussions and document analysis. One official from the Department of Teacher Education(DTE) at the University of Zimbabwe(UZ),the Principal, the Vice Principal and 10 lecturers from the studied college,3 Heads of Science department in secondary schools,3mentors and 5 groups of 10 and 11eleven student teachers participated in the study. The DTE Handbook (2012), vision and mission statements and core values of the Ministry of Higher and Tertiary Education Science and Technology Development (MHTESTD),DTE and the studied college, syllabuses, teaching practice reports, policy documents, external examining reports, College Academic Board (CAB) minutes, admission records, mark profiles and pass lists among other relevant documents complemented interview data. As a theory driven study, structural, cultural and agential influences were found to be enabling and / or constraining the model. The acute shortage of Science teachers in secondary schools and the few Post ‗A‘ Level Science graduates led to the re-introduction of the 3- year Post ‗O‘ Level Science program in secondary teacher education colleges. The bureaucratic structures in educational institutions, the In-Out-In structure, institutional structures such as the family, the University, the studied college, secondary schools, infrastructural facilities, material and financial resources, transport facilities and utilities such as water, electricity and the internet were established as some among other structural factors affecting the 3-3-3 model. Discourses held about the teaching profession, the vision, mission and core values of the MHTESTD,DTE and the studied college, beliefs about what Science teachers should learn, knowledge, skills, attitudes and values they should acquire and how they should be taught were established as cultural factors enabling and / or constraining the 3-3-3 model. Agential influences offering causal explanation for enablers and / or constrainers of the model were established as the decision by the Principal and the CAB to re-introduce the 3- year Post ‗O‘ Level Science program, the decision by the students to enroll for the program, the recruitment of under qualified students, the use of various teaching methods, conducting staff development and mentorship workshops and failure to increase staff establishment. The study has put forth recommendations for the improvement on constraining factors in pre-service teacher education programs. With the understanding that agency has power to reinforce or transform structures and cultures, it should not be seen to be reinforcing disadvantaged structural positions and cultures; instead, after having identified structural and cultural constrainers, it should engage in communicative and meta-reflexivity to come up with the best possible solutions to the hindrances. Courses of action should then be taken accordingly.
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Date Issued: 2015

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Enabling autism educators to identify and address challenges using participatory action research

- Kok, Mandie

Authors: Kok, Mandie
Date: 2015
Subjects: Autistic children -- Education -- South Africa , Learning disabled children -- Education -- South Africa
Language: English
Type: Thesis , Masters , MEd
Identifier: http://hdl.handle.net/10948/7881 , vital:24318
Description: Teachers in the field of autism education encounter multiple professional challenges in their roles as educators. Autism spectrum disorder presents with a broad range of symptoms, which places additional demands on the teacher expected to meet all the learners' needs. Insufficient teacher education and training, coupled with limited access to resources and a lack of support from the Department of Basic Education can lead to teachers feeling overwhelmed and powerless to adequately address work-related challenges. This study employed a participatory action research methodology and sought to identify challenges and develop solutions in the field of autism education. Furthermore, the goal of this study was to find ways of making use of existing resources to better meet the teachers' needs, as well as reconsidering the classroom environment in order to better meet the learners' needs. The cyclical nature of a participatory action research approach allowed the participants to renegotiate the research goals throughout the study. Data were generated through the use of open-ended group interviews, observation and written critical self-reflections. From the data, six themes emerged. First, the participants reported feeling empowered as a result of creating and sharing their personal reflections. Next, they identified the lack of support for teachers as a professional challenge. The participants also indicated that more flexible teaching strategies were required in the field of autism education. Another challenge was that teachers were uncertain of their legal rights within the field of ASD education. Poor communication between parents and teachers was identified as an important issue. Finally, it emerged that the classroom environment had a significant impact on the learners' behaviour. These findings led to the conclusion that teachers in the field of autism education should be supported and the challenges they face acknowledged and addressed by their employers as well as by the Department of Basic Education and the institutions responsible for educating and training new teachers. Finally, recommendations for possible solutions and further research were presented, based on the data generated during the study.
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Date Issued: 2015

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Enantioselective transformations using tetrol as a chiral mediator

- Dorfling, Sasha-Lee

Authors: Dorfling, Sasha-Lee
Date: 2015
Subjects: Enantioselective catalysis , Trichothecenes , Catalysts , Titanium
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:10445 , http://hdl.handle.net/10948/d1021195
Description: (+)-(2R,3R)-1,1,4,4-Tetraphenylbutane-1,2,3,4-tetraol (TETROL) and its derivatives were reacted with varying molar ratios of titanium isopropoxide (2:1, 1:1 and 1:2 tetraol:titanium isopropoxide) in an attempt to prepare potential titanium-based tetraol catalysts for enantioselective transformations. In each case, infrared and HNMR spectra suggested that the product was formed. We tentatively proposed that the structure of the catalyst was a spiro-type, but we could not determine conclusively what its exact structure was, despite using numerous techniques at our disposal (molecular modelling calculations, H NMR and IR spectroscopy, thermal analyses, powder diffraction, and single crystal X-ray diffraction). The catalyst and derivatives thereof were able to act catalytically for the enantioselective additions of diethylzinc compounds to aldehydes. The effects of temperature and solvent were investigated, and toluene and -78 °C were selected as optimal from the results obtained. (The reaction could, however, not be maintained at this low temperature for extended periods due to the fact that we did not have, at our disposal, the correct equipment. Each 16 h reaction was thus allowed to reach room temperature in each case.) The selectivity for the product 1-phenylpropan-1-ol (when benzaldehyde was the starting aldehyde) varied depending on the nature of the aryl substituents of the titanium-based catalyst. Using 0.2 molar equivalents of the chiral titanates, the highest selectivity was 42 percent (e.e.), but only when excess Ti(O-i-Pr)4 had been added to the reaction mixture. This was achieved with the tetra(ortho-methoxyphenyl)-TETROLate derivative. TETROL and its derivatives were also successful in metal-free catalysis where higher conversions and selectivities were observed, compared to when these were complexed to titanium. The highest selectivity was 70 percent (e.e.), achieved with the tetra(ortho-methylphenyl)TETROL derivative.
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Date Issued: 2015

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Encouraging individual retirement savings in South Africa

- Hirschbeck, Lisa

Authors: Hirschbeck, Lisa
Date: 2015
Subjects: Retirement income -- Planning-- South Africa , Retirement income -- Government policy -- South Africa , Pension trusts -- South Africa -- Management , Pension trusts -- Termination -- Law and legislation -- South Africa , Income tax deductions for retirement contributions -- South Africa
Language: English
Type: Thesis , Masters , MCom
Identifier: vital:913 , http://hdl.handle.net/10962/d1017535
Description: Many South Africans may not have adequate retirement savings when they retire and this has the effect of a low income replacement ratio on retirement that may lead to a decrease in the standard of living of the retiree and in extreme cases the retiree becoming dependent on their family and the government. Owing to this trend of no or inadequate retirement savings, South Africa embarked on a retirement reform journey in 2004. The goal of this research is to determine whether the retirement reform mechanisms outlined by National Treasury would encourage individual retirement savings that should assist South Africans to achieve stability of income in their retirement. This research analysed the current retirement savings options and vehicles available for South Africans, the current tax incentives and disincentives and reviewed the proposed changes to tax incentives and disincentives during the accumulation phase of retirement savings and explained how these proposed tax incentives are harmonised for the accumulation phase of retirement. The research explained how National Treasury aims to limit pre-retirement withdrawals and how it intends to encourage the annuitisation of post-retirement benefits. The penultimate chapter of this research measured the effect (by making certain assumptions) of the changes proposed by National Treasury on the income replacement ratio of the retiree. Throughout the research comparisons were made between The OECD Roadmap for the good design of defined contribution pension plans and National Treasury’s proposals. This research did not directly address the effect of increased life expectancies on retirement savings or increases in youth unemployment and the effect that this may have on retirement savings. The effect of financial charges levied on retirement savings on the income replacement ratio of a retiree was also not explored. Furthermore, not all pension funds are regulated by the Pension Funds Act and how these pension funds can be brought within the purview of the Pension Funds Act was not investigated. Automatic enrolment of retirement savings for all employees in South Africa in retirement vehicles is a further research area that could be addressed.
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Date Issued: 2015

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Engaging within zones of proximal development on Facebook : the case of using Facebook to support learning and mentoring on a NQF Level 5 environmental education, training and development practices learnership

- Chetty, Preven

Authors: Chetty, Preven
Date: 2015
Subjects: Social media -- Study and teaching (Higher) -- South Africa , Internet in education , Online social networks , Organizational learning , Employees -- Training of , Group work in education
Language: English
Type: Thesis , Masters , MEd
Identifier: vital:2024 , http://hdl.handle.net/10962/d1017335
Description: This study focuses on two roll-outs of a, year-long National Qualification Framework (NQF) level 5, environmental education learnership in South Africa and attempts at enhancing collaborative learning at workplaces using a familiar social networking site called Facebook. This study uses the Facebook group sites created for the workplace course component of the course as one of the means of data collection. Additional interviews and focus groups with learners and administrators on both Environmental Education Training and Development Practices (EETDP) courses also informed the study. The study is located within the context of the rise of the information age, its effects on socio-ecological landscape at large and ways of using social networking sites in order to facilitate scaffolding and meaning making within zones of proximal development for environmental education learnerships. It also looks at the model of apprenticeship and workplace based learning as it is broadly located at the nexus of the SAQA-led academic inquiry into workplace based learning and professional development. It was found that the use of Facebook on the EETDP learnership allowed for collaborative learning to take place between peer to peer interactions as well as between tutors and learners. It was also noted that scaffolding processes requires both technical assistance and strong instructional input from course tutors. One of the most important findings in terms of collaborative learning and engaging within the Zone of Proximal Development (ZPD) was that learners were able to communicate more effectively and freely with both fellow learners and tutors on course after participating on the Facebook group sites. The study offers recommendations on how a social networking platform like Facebook can be utilised effectively for environmental education. The study recommends that scaffolding of workplace based tasks and concepts needs to be better integrated with the course and in both online and offline interactions between learners. It also illustrates how social networking sites can become powerful tools for creating meaning making when combined with course work.
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Date Issued: 2015

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Enhanced optical limiting behaviour of indium phthalocyanine derivatives when in solution or embedded in poly (acrylic acid) or poly (methyl methacrylate) polymers

- Sanusi, Kayode, Nyokong, Tebello

Authors: Sanusi, Kayode , Nyokong, Tebello
Date: 2015
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/189445 , vital:44847 , xlink:href="https://doi.org/10.1016/j.jphotochem.2015.02.003"
Description: The optical limiting performance of indium phthalocyanine-based polymer thin-films with large nonlinear absorption coefficients (βeff) and low limiting threshold intensity (Ilim) are described. The absorption cross-sections and the population dynamics of the excited states are also reported. The excited state absorption cross-sections (σexc) are shown to depend on the transition moment between the T1 and T2 states. βeff values have been shown to be related to the population density of the molecules in the T1 state. The improved optical limiting performance recorded for the investigated phthalocyanine complexes in the presence of polymer matrices has been attributed to the aggregation effects of the complexes in the polymer thin-films. The optical properties of the indium phthalocyanine moieties were found to possess robust sensitivity to a change of the polymer materials.
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Date Issued: 2015

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