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Dissertations / Theses on the topic 'Van Zyl'

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Published: 4 June 2021

Last updated: 11 February 2022

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1

Van, Zyl Heleneze. "Resilience among middle-born children / H. van Zyl." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7252.

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Existing literature on resilience portrays middle-born children as vulnerable. Middle-born children have to face many risks, such as a tendency towards delinquent behaviour, having poor relations with family members, being low achievers and harbouring negative feelings. Many children who face risk and who consequently are in danger of maladaptive outcomes manage to bounce back from these risks. Such children are called resilient. Research suggests that resilience among children is a common phenomenon, but no literature exists that focuses specifically on resilience among middle-born children.

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2

Van, Zyl Leon Erasmus. "'n Profielontleding van wynverbruikers in die Noord-Kaapprovinsie / Leon Erasmus van Zyl." Thesis, North-West University, 2003. http://hdl.handle.net/10394/398.

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Consumers play an important role in the productive functioning of the economy. They form an integral part of the daily flow of transactions of all organisations in a business-oriented society. Analysing the consumer is therefore important to determine what they buy, how much they buy, who does the shopping as well as how and where they do their shopping. A marketing strategy is a combination of decisions on target marketing and the marketing mix. An organisation's marketing strategy rests on the following: o The analysis of specific consumer preferences and needs; o Based on this, marketing ma

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Van, Zyl Marie-Antoinette. "Employee turnover in a financial institution / van Zyl M." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7273.

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With recognition of turnover as a financial issue increasing, companies are searching for strategies to confront the problem in ways that generate a good return on investment. Successfully managing turnover is a matter of understanding its costs, causes and cures. In service–oriented industries such as banking, people are considered among the most important assets of a firm. Forward–thinking banks are looking for ways to leverage people, along with processes and technology, to achieve their objectives. Employee expectations are changing, too, forcing organisations to place a greater emphasis o

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4

Van, Zyl Lelanie. "Job insecurity : emotional- and behavioural consequences / L. van Zyl." Thesis, North-West University, 2009. http://hdl.handle.net/10394/3089.

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Current day organisations must revert to many measures to survive in the very competing business environment. One of these measures is to reduce the number of employees. This leads to perceptions of job insecurity, not only in the employees who are not made redundant but also in employees in so-called stable organisations who are aware of these measures being implemented in other organisations. Researchers found conflicting results of job insecurity regarding performance of employees experiencing job insecurity. On the one hand it was reported that job insecurity leads to higher job performanc

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Van, Zyl Heidi. "Bestuur van 'n multikulturele werkerskorps binne 'n korporatiewe finansiële instelling / Heidi van Zyl." Thesis, North-West University, 2003. http://hdl.handle.net/10394/148.

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Differences among people, and particularly cultural and racial differences, have played an integral part in the development of South Africa as a nation. The management of diversity and the challenges and problems it poses are one of the most important issues facing South African managers. Changes in the South African business environment are placing South African business organisations under increasing pressure to move towards democratic, nonracial and fully representative organisational structures. In an attempt to accelerate this process, companies are embarking on affirmative action program

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6

Van, Zyl Louwrens Hermias. "Advanced linear methods for T-tail aeroelasticity / Louwrens Hermias van Zyl." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8492.

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Flutter is one of the primary aeroelastic phenomena that must be considered in aircraft design. Flutter is a self-sustaining structural vibration in which energy is extracted from the air flow and transferred to the structure. The amplitude of the vibration grows exponentially until structural failure occurs. Flutter stability requirements often influence the design of an aircraft, making accurate flutter prediction capabilities an essential part of the design process. Advances in computational fluid dynamics and computational power make it possible to solve the fluid flow and structural dynam

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7

Van, Zyl Andries Johannes. "Beroepsgerigte onderwys aan spesiale skole in Transvaal / Andries Johannes van Zyl." Thesis, Potchefstroom University for Christian Higher Education, 1988. http://hdl.handle.net/10394/9504.

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Accountable education for mentally handicapped pupils who receive their tuition at special schools should lead to self-actualisation. The pupil achieves self-actualisation through, among other factors, the choice of a sui table career, as this helps him to become a useful, self-supporting and competent member of society. However, the training which a pupil attending a special school receives, does not provide him with direct access to training as an apprentice. Pupils often expect that the practical fields in which they specialised at school will lead to their obtaining employment in these fie

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8

Van, Zyl Ida. "DNA damage and repair during the mammalian hormonal cycle / Ida van Zyl." Thesis, North-West University, 2005. http://hdl.handle.net/10394/922.

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The aim of this study was to determine the pattern of DNA damage and repair during the mammalian female hormonal cycle. This was done to determine whether the hormonal cycle must be taken into account when DNA damage and repair studies are done in female subjects, especially so when surrogate tissue such as white blood cells are involved. Because certain factors including gender, age and diet may influence the comet assay responses in lymphocytes when monitoring human genotoxicity, we posed the question whether the menstrual cycle would influence the comet assay responses in lymphocytes to any

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9

Van, Zyl Pieter Gideon. "Recovery of gold from spent matrices using supercritical carbon dioxide / P.G. van Zyl." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1487.

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10

Van, Zyl Tertia. "The impact of training on productivity in mass food production / T. van Zyl." Thesis, North-West University, 2004. http://hdl.handle.net/10394/505.

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The motivation for this study was to increase the knowledge of foodservice personnel in mass food production in the foodservice area in which they work and by doing so, increasing their productivity. Training is often used to improve productivity and is seen as the answer to many productivity problems. Training and productivity improvement go hand in hand. Little research has been done on training and productivity in mass food production. The main objective of this study was to investigate the impact of training on the productivity of workers in mass food production by means of questionnaires.

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11

Van, Zyl Cecile. "A script development model for the creation of computer games / Cecile van Zyl." Thesis, North-West University, 2008. http://hdl.handle.net/10394/4196.

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The concept of game development has traditionally not implemented the skills of professional writers to develop the scripts for a computer game. However, due to the growth in complexity and size of the computer game development process, as well as the growing teams of people involved in the development of computer games, the need to employ skilled writers has emerged in modern computer game development. It has, however, become clear that the role of the writer within the collaborative game development process is still ill-defined. And therefore, the writer who wishes to start writing for the g

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12

Van, Zyl Madeleine. "Die dokumentasie en danskundige ontleding van bepaalde Suid-Sotho-danse met verwysing na die liggaamlike opvoedingprogram / Madeleine van Zyl." Thesis, Potchefstroom University for Christian Higher Education, 1985. http://hdl.handle.net/10394/9573.

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Traditional dances of the South Sotho of Qwaqwa were studied as a product of culture. The two major objectives were: to document, and analyse specific South Sotho dances and relate them holistically to the culture; and to determine which dances of the girls and the women would be suitable for inclusion in the Syllabus for Physical Education for Girls in the Republic of South Africa according to certain educational criteria. The aspects investigated in the study included the following: 1. An ethnographic image of the South Sotho relating to ancestry, way of life and culture; 2. Dance as a cultu

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13

Van, Zyl Elizabeth Magaretha. "The regulation of eco-labelling in South Africa : a comparative analysis / Elizabeth Magaretha van Zyl." Thesis, North-West University, 2004. http://hdl.handle.net/10394/573.

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14

Van, Zyl Lindi. "Formulation and evaluation of different transdermal delivery systems with flurbiprofen as marker / Lindi van Zyl." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9727.

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The aim of this study was to investigate the effect of different penetration enhancers containing essential fatty acids (EFAs) on the transdermal delivery of flurbiprofen. Flurbiprofen was used as a marker / model compound. Fatty acids were chosen as penetration enhancers for their ability to reversibly increase skin permeability through entering the lipid bilayers and disrupting their ordered domains. Fatty acids are natural, non-toxic compounds (Karande & Mitragotri, 2009:2364). Evening primrose oil, vitamin F and Pheroid™ technology all contain fatty acids and were compared using a cream ba

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Van, Zyl Llewellyn Ellardus. "The development and evaluation of positive psychological interventions aimed at happiness / Llewellyn Ellardus van Zyl." Thesis, North-West University, 2012. http://hdl.handle.net/10394/10376.

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One of the great challenges for positive psychology is that academics, researchers and authors are yet to reach agreement on the terminology, constructs and methodology of the various positive psychological concepts and interventions. One such concept that has been ambiguously and often inconsistently conceptualised is happiness. Interventions that are structured around these conceptualisations have produced mixed results, which are attributable to various aspects such as the unidimensional conceptualisation of the concept, inconsistent measurement, psychometric measuring instruments that have

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16

Zyl, Dwain George van [Verfasser], and Henri-Jacques [Akademischer Betreuer] Delecluse. "Modified virus as a vaccine against EBV infection / Dwain George van Zyl ; Betreuer: Henri-Jacques Delecluse." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177043998/34.

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17

Van, Zyl Sandra. "Evaluation of N,N'-disubstituted 1,3-Diaminopropan-2-ols for anti-HIV activity / Sandra van Zyl." Thesis, North-West University, 2004. http://hdl.handle.net/10394/526.

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The acquired immunodeficiency syndrome (AIDS) pandemic continuous to be a medical, social and economic challenge of staggering proportions. The human immunodeficiency virus (HIV) has been identified as the etiologic agent of this disease. The HIV-1 protease enzyme is one of the specific targets for anti-retroviral therapy. It was chosen for this study because of its well described crystal structure and based on previous research and results. A novel series of protease inhibitors were designed, and evaluated for possible anti-HIV activity. 1,3-Diaminopropan-2-01 derivatives containing benzofura

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18

Venter, Philip van Zyl. "A supercritical R-744 heat transfer simulation implementing various Nusselt number correlations / Philip van Zyl Venter." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4234.

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During the past decade research has shown that global warming may have disastrous effects on our planet. In order to limit the damage that the human race seems to be causing, it was acknowledged that substances with a high global warming potential (GWP) should be phased out. In due time, R-134a with a GWP = 1300, may probably be phased out to make way for nature friendly refrigerants with a lower GWP. One of these contenders is carbon dioxide, R-744, with a GWP = 1. Literature revealed that various Nusselt number (Nu) correlations have been developed to predict the convection heat transfer coe

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19

Zeeman, Johannes van Zyl. "'n Strategiese plan vir 'n risikobestuurdivisie in 'n bankgroep in die R.S.A. / deur Johannes van Zyl Zeeman." Thesis, Potchefstroom University for Christian Higher Education, 1992. http://hdl.handle.net/10394/1511.

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20

Van, Zyl Hester. "The role of p-glycoprotein and peptides in attention deficit disorder with hyperactivity (ADHD) / Hester van Zyl." Thesis, North-West University, 2004. http://hdl.handle.net/10394/525.

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A characteristic peptide profile was detected in the urine of certain patients suffering from ADHD. The purpose of this study was to determine whether defective p-glycoprotein may be responsible for the occurrence of this peptide profile in children with ADHD. Urine analysis of children with ADHD was performed using HPLC with UV detection at 215 and 280 nm. A six step gradient elution was attained by using two mobile phases: buffer A was 0.1 per cent trifluoroacetic acid (TFA) and buffer B 0.1 per cent TFA in acetonitrile on a Vydac C18 column. To verify the results obtained in humans, the fol

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21

Van, Zyl Llewellyn Ellardus. "Work-role fit, meaningfulness and engagement of industrial/organisational psychologists in South Africa / Llewellyn Ellardus van Zyl." Thesis, North-West University, 2009. http://hdl.handle.net/10394/4776.

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The work of industrial/organisational (I/O) psychologists presents an interesting context for studying meaning and engagement (as eudaimonic components of happiness). (I/O) psychologists spend more than 88% of their working day with people, and they are primary role models for happiness and change in the workplace. Information about the manifestation of their meaning and work engagement is therefore needed. The aim of this study was to determine how (I/O) psychologists experience the meaning of their work and to investigate the relationships between their experiences of work-role fit, meaning

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22

Van, Zyl Jan Johannes Steyn. "An analysis of selected stakeholder dynamics in the South African recreational freshwater angling sector / by J.J.S. van Zyl." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4449.

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Angling as a sport and recreational activity attracts millions of participants worldwide, making it the most popular pastime on the planet. Freshwater bank anglers in South Africa account for approximately 60% of the angling community and contribute billions to the economy. The freshwater bank angling industry as such is largely informal, with the exception of the small organised angling section. The technical aspects of angling receive an abundance of covering in magazines and increases in popularity through the electronic media. This study focuses on lesser known aspects regarding the anglin

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23

Van, Zyl Petrus Albertus Le Roux. "The impartial and independent composition of the international arbitral tribunal : a critical survey / Petrus Albertus Le Roux van Zyl." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1381.

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Globally the resolution of disputes is known for expensive costs and lengthy periods of time before a court reaches a decision. This position becomes even more complex where a person has to resort to a foreign country with a foreign legal system to resolve a dispute. International commercial arbitration provides a practical alternative to resolve disputes in the world of international trade. lnternational commercial arbitration can shortly be described as a private method of dispute resolution, chosen by the parties themselves as an effective way of putting an end to disputes between them, wit

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Van, Zyl Lelanie. "An evaluation of the fairness criteria for dismissals due to absenteeism and desertion from the workplace / Lelanie van Zyl." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8291.

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The dissertation investigates the fairness criteria pertaining to absenteeism and desertion. It should be recognised that desertion is a special case of absenteeism. Desertion is absence from work with the intention of not returning, thus terminating the employment contract. Absenteeism is absence from work with the intention of returning. The intention of the employee determines the employer’s cause of action. The dissertation investigates fairness criteria and applicable action by the employer pertaining to such cases in order to avoid unfair dismissal. Procedure should be fair, but can only

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25

Van, Zyl André Stephmar. "Collaborative transboundary water quality monitoring :a strategy for Fezile Dabi District Municipality and its neighbours / André Stephmar van Zyl." Thesis, North-West University, 2012. http://hdl.handle.net/10394/10111.

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The geographic location of Fezile Dabi District Municipality is unique in the sense that it is one of five district municipalities in the Free State Province that borders on five district municipalities and three provincial boundaries. The Vaal River, a valuable domestic, industrial and agricultural water resource for millions of South Africans, forms one of the administrative boundaries of this district municipality and of the Free State Province. However, despite the vital role the Vaal River plays in the Fezile Dabi region, there is poor water management and assessment system in place. Ther

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26

Zyl, Jacobus van [Verfasser], and Ian [Akademischer Betreuer] Cloete. "Fuzzy set covering as a new paradigm for the induction of fuzzy classification rules / Jacobus van Zyl. Betreuer: Ian Cloete." Mannheim : Universitätsbibliothek Mannheim, 2014. http://d-nb.info/106249279X/34.

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Van, Zyl Yolandé. "Job insecurity, burnout, work engagement, general health and job satisfaction in selected organisations in the Vaal Triangle / Yolandé van Zyl." Thesis, North-West University, 2005. http://hdl.handle.net/10394/2367.

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Van, Zyl Petrus Jurgens. "Regional neurochemical characterization of the flinders sensitive line rat with regard to gaba and cholinergic signalling pathways / P.J. van Zyl." Thesis, North-West University, 2008. http://hdl.handle.net/10394/4190.

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Despite their acknowledged efficacy, currently available antidepressants still demonstrate undesirable side effects, shortfalls in effectiveness and a delayed onset of action. All these agents act via monoaminergic mechanisms, although recent studies have begun to note the potential role of the cholinergic system as well as the amino acid pathways in affective isorders. It has been suggested that glutamate NMDA receptor activation may be involved in hippocampal degeneration seen in patients with depression, as well as contributing as a molecular target for the antidepressant action of known an

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Van, Zyl Tiaan. "A longitudinal analysis of the prescribing patterns of anti–epileptic medicine by using a medicine claims database / T. van Zyl." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4918.

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The prevalence of epilepsy in society is general knowledge; however the impact on social activity as well as other daily factors are not always fully recognised. Epilepsy frequently poses a problem with regard to work–related activities (Heaney, 1999:44). Moran et al. (2004:425) indicated that the major impacts of epilepsy on life were work and school difficulties, driving prohibition, psychological and social life of which restriction of work or schooling has the greatest impact on epileptic’s life. In all cases the type, severity, and frequency of the seizures as well as the age would be rel

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Van, Zyl Yolandé. "Occupational stress, burnout, job satisfaction, work engagement and organisational commitment of educators on senior level in the Sedibeng West district / Yolandé van Zyl." Thesis, North-West University, 2003. http://hdl.handle.net/10394/2463.

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31

Masango, Charles Akwe. "User preferences in the use of Law Library collections : a case study of the Brand van Zyl Law Library of the University of Cape Town." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/13397.

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Bibliography: leaves 129-134.<br>Law libraries are specialised libraries consisting primarily of printed and electronic legal literature which assist their patrons in legal research and the teaching of law. The use of the law library by the entire university often causes concern on the part of the legal patrons and staff who use and manage the library and its collection. This dissertation investigates the nature and purpose of the law library of the University of Cape Town, with a view to establishing patterns of use and revealing the problems encountered by patrons and members of staff in the

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Van, Zyl Pieter Strauss. "Obesity/overweight and physical activity's relationship with depressive symptoms of 13 to 15 year-old girls in the North-West Province : the THUSA BANA study / P.S. van Zyl." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2068.

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33

Coetzee, Jolize. "Leadership behaviours for the successfull strategic repositioning of Sanlam." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/5537.

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Thesis (MBA (Business Management))--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: The current effects of globalisation are requiring of leaders to deal with many changes in the workplace, including a globally changing, diverse workforce. The question that this research report aims to address is what does it require of a leader to be successful in the business environment today and what characteristics or behaviours would such a leader display? It is argued that although the context of leadership has and will continue to change, the fundamentals of leadership have essentially remaine

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Heyer, Gina Margareta. "Explorations of the painted real : technological mediation in the work of four artists." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6633.

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Thesis (MA)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: This thesis is an investigation into the relationship between photorealistic painting and specific devices used to aid the artist in mediating the real. The term 'reality' is negotiated and a hybrid theoretical approach to photorealism, including mimesis and semiotics, is suggested. Through careful analysis of Vermeer's suspected use of the camera obscura, I argue that camera vision already started in the 17th century, thus signalling the dramatic shift from the classical Cartesian perspective scopic regime to the model o

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Willems, Johannes Cornelius Maria. "Wie zal de opvoeders opvoeden? kindermishandeling en het recht van het kind op persoonswording /." Maastricht : Maastricht : Universiteit Maastricht ; University Library, Maastricht University [Host], 1998. http://arno.unimaas.nl/show.cgi?fid=8548.

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Wal, Ronald van der. "Of geweld zal worden gebruikt ! : militaire bijstand bij de handhaving en het herstel van de openbare orde 1840-1920 /." Hilversum : Verloren, 2003. http://catalogue.bnf.fr/ark:/12148/cb39273662b.

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Van, Zyl Corli. "CUSUM procedures based on sequential ranks / Corli van Zyl." Thesis, 2015. http://hdl.handle.net/10394/15733.

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The main objective of this dissertation is the development of CUSUM procedures based on signed and unsigned sequential ranks. These CUSUMs can be applied to detect changes in the location or dispersion of a process. The signed and unsigned sequential rank CUSUMs are distribution-free and robust against the effect of outliers in the data. The only assumption that these CUSUMs require is that the in-control distribution is symmetric around a known location parameter. These procedures specifically do not require the existence of any higher order moments. Another advantage of these CUSUMs is that

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Van, Zyl Stefanus. "Die representasie van veelfasettige manlikheidsbeelde in Eben Venter se romanoeuvre / Stefanus van Zyl." Thesis, 2014. http://hdl.handle.net/10394/12087.

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This study focuses on the representation of masculine imagos in the South African novelist Eben Venter’s novel oeuvre and more specifically on the multifaceted nature of Venter’s delineation of masculinity. His novels Foxtrot van die Vleiseters (1993), Ek stamel ek sterwe (1996) (translated into English as My beautiful death ((2004)) and Santa Gamka (2009) were selected to represent Venter’s novel oeuvre. The male protagonist in each novel may be viewed as typical representations of masculine imagos in his novels. The workability of cognitive narratology as a literary approach to analyse and i

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Van, Zyl Louis Egbertus. "Die ontstaan van die menslike bewussyn : bied panpsigisme 'n uitweg? / Louis Egbertus van Zyl." Thesis, 2014. http://hdl.handle.net/10394/15885.

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Although evolution is a very important concept in contemporary biology, it does not help to answer the question to the origin of the human consciousness. If all reductionist theories are ruled out because it tries to reduce consciousness to an objective aspect of the natural world and ignore the storytellers’ (consciousness) subjective side, panpsychism seems to be a favourable candidate for an alternative theory. The so called Copenhagen-interpretation furthermore brought an end to determinism and classical objectivity and pointed out that our reality is partly created by the observer. The wo

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Van, Zyl Susarah. "Die onderrig van Scratch met die oog op die aanleer van Delphi as objekgeoriënteerde programmeertaal / Susarah van Zyl." Thesis, 2014. http://hdl.handle.net/10394/15737.

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Volgens die Kurrikulum- en Assesseringsbeleidsverklaring moet Inligtingstegnologie-leerders in graad 10 aanvangsonderrig in Scratch as programmeertaal ontvang en in graad 11 na Delphi of Java as programmeertaal oorskakel. In Noordwesprovinsie word Delphi as programmeertaal in graad 11 bestudeer. Die aard van Scratch en dié van Delphi verskil egter van mekaar. Scratch is ŉ visuele programmeertaal met ŉ speelse aard, waar boublokke met ingeboude programmeringskode inmekaar gepas word om programme te skep, terwyl programmeringskode in Delphi, onderhewig aan sintaktiese reëls, ingetik word. Daar w

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Van, Zyl Tarina. "Educational software for understanding integrated blood glucose effects / Tarina van Zyl." Thesis, 2011. http://hdl.handle.net/10394/11078.

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The World Health Organisation considers diabetes mellitus as a fast-growing epidemic. The number of documented cases increase each year; together with the number of patients hospitalised due to complications associated with the disease. These long- and short-term complications can include blindness, kidney failure, circulatory diseases, neuropathy, to name a few. The management of diabetes is a lifelong procedure that can become very expensive. Often patients lapse in their efforts. The education of diabetics, family members and care providers is therefore essential to ensure that lifelong acc

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Van, Zyl Johanna Maria. "'n Bestuursmodel vir oop afstandsleer aan die NWU / Johanna Maria van Zyl." Thesis, 2012. http://hdl.handle.net/10394/10599.

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Distance education as delivery mode is currently attracting more and more learners globally who want to improve their skills and qualifications. This is necessitated by especially the limited components of existing contact universities, financial expenditure and working learners. The presenting of open distance learning by existing contact universities in South Africa is relatively unknown. Consequently the aim of this study is also to investigate a model for Open Distance Learning used at the NWU, an existing contact university. In order to achieve this aim, several other aims were set as wel

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Van, Zyl Maria Elizabeth. "Die Suid-Afrikaanse historiese in die kinder- en jeugverhaal / Maria Elizabeth van Zyl." Thesis, 1985. http://hdl.handle.net/10394/10681.

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History as a school subject confronts a child with events, motives for action, and moral dilemmas, demanding a high level of abstract reasoning. Before the child reaches the cognitive stage of formal operations (14 years), his abstract reasoning is limited and egocentric in terms of time concept and social consciousness. To supplement this lack of abstraction, it seems necessary to enrich the teaching of history by means of substitute experiences. In an analysis of different teaching methods, it was found that abstract historical facts become more palatable to the pupil when historical novels

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Van, Zyl Elizabeth Magaretha. "The regulation of eco-labelling in South Africa : a comparative analysis / by E.M. van Zyl." Thesis, 2004. http://hdl.handle.net/10394/573.

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Van, Zyl Petrus Albertus Leroux. "The impartial and independent composition of the international arbitral tribunal : a critical survey / by Le Roux van Zyl." Thesis, 2006. http://hdl.handle.net/10394/1381.

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Van, Zyl Cornelia Cecilia. "An evaluation of the efficiency of various respiratory protective equipment, used within platinum processing / Cornelia Cecilia van Zyl." Thesis, 2009. http://hdl.handle.net/10394/14208.

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Workplace performance measurements of respiratory protective equipment (RPE) are fundamental to understanding how well users are protected during work activities. This study evaluated the effectiveness of various respiratory protective devices used within the platinum producing industry and whether facial hair influenced the seal efficiency of the facepiece. Three life-size mannequins, each connected to a personal sampling pump, were used to test the efficiency of respirators within three different work environments. It was found that the 3M 8822, 3M 6000, Moldex 8000 and Drager air-stream hel

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Zyl, Jacobus van [Verfasser]. "Fuzzy set covering as a new paradigm for the induction of fuzzy classification rules / vorgelegt von Jacobus van Zyl." 2007. http://d-nb.info/984768548/34.

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Zyl, Rebekka Maria van [Verfasser]. "Untersuchung zur Speicherung und Funktion von Sulfatid in Neuronen anhand von transgenen Mäusen / vorgelegt von Rebekka Maria van Zyl." 2009. http://d-nb.info/999721925/34.

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Van, Zyl Caitlynd. "The association of antioxidant enzyme activity with cardiovascular variables in a bi-ethnic population : the SABPA study / Caitlynd van Zyl." Thesis, 2014. http://hdl.handle.net/10394/15732.

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Motivation Hypertension is an escalating problem in our South African population, especially among urban black Africans. The development of hypertension may be facilitated by various factors, including oxidative stress. Oxidative stress can be caused by a decrease in antioxidant capacity or an increase in the production of reactive oxygen species (ROS). Previous studies by our research team support the theory of increased oxidative stress in our black population, but it is unknown whether it is the result of decreased antioxidant enzyme activity, or an increase in ROS production. Aims We aimed

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Van, Zyl Johanna Magdalena. "Investigating the level of disclosure of emissions by the top ten manufacturing companies in South Africa / Johanna Magdalena van Zyl." Thesis, 2015. http://hdl.handle.net/10394/15735.

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Throughout the world, countries and companies are directing their attention towards actions to protect the planet, and an important focus area during various initiatives is the aim to stabilise greenhouse gas concentrations at a level that would prevent dangerous anthropogenic interference with the climatic system. Various targets are set by governments to reduce greenhouse gas emissions and the South African Government is, among others, investigating a carbon tax policy to facilitate their transition to a greener economy. As the global manufacturing industry emits up to 43 percent of the glob

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