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Analytical control valve selection for mine water reticulation systems / F.G. Taljaard.Taljaard, Francois George January 2012 (has links)
Some of the largest and deepest mines in the world are situated in South Africa. Underground temperatures and humidity can be controlled by means of complex chilled water reticulation system. A cascade pumping system is used to pump the used water from the underground levels back to the surface.
The dewatering process is energy intensive. Large volumes of water are used during the general mine drilling periods (06:00 to 12:00). During blasting periods (15:00 to 18:00) a minimum amount of personnel are underground, yet large volumes of water are still sent underground due to a lack of control. Reducing the water sent underground, will reduce the amount of water pumped back to the surface; resulting in significant energy savings.
Water flow and pressure can be managed by installing control valves at appropriate positions throughout the water reticulation system. Selecting a control valve is typically governed by constraints such as cavitation, water hammer, flashing, safety ratings and control range. A basic set of calculations can be used to determine whether a valve conforms to a specific scenario. However, scenarios calculated by engineers are not indicative of all applied system scenarios.
When control valves are installed, to optimise the operation of a system, it affects the system’s characteristics. Sampled system data will therefore no longer provide adequate readings to help with selecting the correct control valve. An analytical control valve selection method has been developed and implemented. The case study shows the results and practical implications of applying this method in the mining industry. Implementing the analytical valve selection method is shown to be viable, realising electrical energy cost savings for the mine by reducing power requirements from Eskom. Analytical control valve selection for mine water reticulation systems / Thesis (MIng (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2013.
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Analytical control valve selection for mine water reticulation systems / F.G. Taljaard.Taljaard, Francois George January 2012 (has links)
Some of the largest and deepest mines in the world are situated in South Africa. Underground temperatures and humidity can be controlled by means of complex chilled water reticulation system. A cascade pumping system is used to pump the used water from the underground levels back to the surface.
The dewatering process is energy intensive. Large volumes of water are used during the general mine drilling periods (06:00 to 12:00). During blasting periods (15:00 to 18:00) a minimum amount of personnel are underground, yet large volumes of water are still sent underground due to a lack of control. Reducing the water sent underground, will reduce the amount of water pumped back to the surface; resulting in significant energy savings.
Water flow and pressure can be managed by installing control valves at appropriate positions throughout the water reticulation system. Selecting a control valve is typically governed by constraints such as cavitation, water hammer, flashing, safety ratings and control range. A basic set of calculations can be used to determine whether a valve conforms to a specific scenario. However, scenarios calculated by engineers are not indicative of all applied system scenarios.
When control valves are installed, to optimise the operation of a system, it affects the system’s characteristics. Sampled system data will therefore no longer provide adequate readings to help with selecting the correct control valve. An analytical control valve selection method has been developed and implemented. The case study shows the results and practical implications of applying this method in the mining industry. Implementing the analytical valve selection method is shown to be viable, realising electrical energy cost savings for the mine by reducing power requirements from Eskom. Analytical control valve selection for mine water reticulation systems / Thesis (MIng (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2013.
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Die aanspreeklikheid van banke as geldskieters vir skade aan die omgewing : 'n regsvergelykende studie / deur G.C. MullerMuller, Gert Cornelius January 2004 (has links)
Banks play an increasingly important role in the economy because they are in
a position to, inter alia, promote development of the environment by utilising
their financial resources. In some instances lenders who took up finance from
banks are responsible for damage to the environment. Why should banks that
financed projects, in the normal course of events, be held liable for damage to
the environment caused by borrowers? The question may be answered by a
comparative legal study of the 2002 European Union Proposal for a Directive
of the European Parliament and of the Council on Environmental Liability with
regard to the prevention and remedying of environmental damage; the
Comprehensive Environmental Response Compensation and Liability Act of
1980 (CERCLA) of the United States; Part IIA of the Environmental Protection
Act of 1990 (EPA) of the United Kingdom and section 28 of the National
Environmental Management Act of 1998 (NEM A).
NEMA, has its foundation in section 24 of the Constitution of the Republic of
South Africa. It incorporates sustainable development as a tool to harmonise
the necessity to develop with the need to protect the environment. At the same
time NEMA emphasises the role of the principle of intergenerational equity,
which presupposes the duty of the current generation to hand over the earth in
a better condition than in which it was received from the previous generation.
In the future banks, when finance is considered for projects that may harm the
environment, must take environmental as well as economical factors into
account. Purely economical reasons cannot be the only relevant factor.
Development that is financially sound will have to be weighed up against
social factors as well as the impact that it will have on the environment.
Section 28 of NEMA places a general duty of care on every person who
causes, has caused or may cause significant pollution or degradation of the
environment to prevent such pollution or degradation from occurring,
continuing or recurring. The persons saddled with the duty of care are the
owner, the person in control, or the person who has the right to use land or
premises. Banks may, under certain circumstances, be considered to be the
owner, person in control, or even the person who has the right use land or
premises. The polluter pays principle is introduced by section 28 as a basis for
liability but the principle is expanded to include, not only the polluter, but also
entities, such as banks, who in no way whatsoever, contributed to pollution or
degradation. NEMA affords no protection to banks in cases where banks
became owner of land by virtue of their security interest in the property. By
following established commercial practices, banks may be held liable for
environmental damage caused by their clients or erstwhile clients.
The traditional role of banks as financial institutions has to change because of
the duty placed on banks by the Constitution and NEMA to act as instruments
in the protection of the environment. By exerting their influence and by
implementing new procedures banks will be able to draw the attention of
prospective clients to the need to comply with environmental legislation.
In terms of the 2002 Directive of the European Union, the operator who directs
an operation by which damage is caused can be held liable for environmental
damage. It is necessary to prove that the bank exercised operational control
over the business of the borrower. The 2002 Directive is more restrictive than
section 28 of NEMA.
CERCLA is the primary federal legislation dealing with pollution of hazardous
substances. The Environmental Protection Agency has the authority to recover
the costs for the reparation of damage to the environment. After the US v Fleet
Factors Corporation decision the position was that banks might be held liable if
their involvement with the management decisions of the borrower are such
that they are in a position to influence the decisions of the borrower. The Asset
Conservation Lender Liability and Deposit Insurance Protection Act of 1996
(ACA) changed the magnitude of the Fleet Factors decision. Provision is made
by ACA to exempt lenders who held security in terms of a secured creditor
exemption, on the condition that the property is alienated at the earliest
practicable commercially reasonable time after acquiring it. The requirement
for liability is that banks must exercise control over the day-to-day activities of
a borrower.
The Environmental Protection Act of 1990 in the United Kingdom states that
the owner (other than the mortgagee in possession) is the person who has the
right to receive the rent of the property if the property was let out. It includes
the occupier of the property. The test is whether such a person is in control of
the property. If the inference can be drawn that the lender is in control then it
can be held liable for environmental damage. EPA, CERCLA as well as the
Directive makes it clear that if sufficient control is exercised by a lender over
the business of a borrower it may be held liable for damage to the
environment.
The emphasis should rather be placed on the ability of banks, generally, to
influence borrowers than to hold them liable for damage caused to the
environment by borrowers. / Thesis (LL.M. (Import and Export Law))--North-West University, Potchefstroom Campus, 2005.
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Die aanspreeklikheid van banke as geldskieters vir skade aan die omgewing : 'n regsvergelykende studie / deur G.C. MullerMuller, Gert Cornelius January 2004 (has links)
Banks play an increasingly important role in the economy because they are in
a position to, inter alia, promote development of the environment by utilising
their financial resources. In some instances lenders who took up finance from
banks are responsible for damage to the environment. Why should banks that
financed projects, in the normal course of events, be held liable for damage to
the environment caused by borrowers? The question may be answered by a
comparative legal study of the 2002 European Union Proposal for a Directive
of the European Parliament and of the Council on Environmental Liability with
regard to the prevention and remedying of environmental damage; the
Comprehensive Environmental Response Compensation and Liability Act of
1980 (CERCLA) of the United States; Part IIA of the Environmental Protection
Act of 1990 (EPA) of the United Kingdom and section 28 of the National
Environmental Management Act of 1998 (NEM A).
NEMA, has its foundation in section 24 of the Constitution of the Republic of
South Africa. It incorporates sustainable development as a tool to harmonise
the necessity to develop with the need to protect the environment. At the same
time NEMA emphasises the role of the principle of intergenerational equity,
which presupposes the duty of the current generation to hand over the earth in
a better condition than in which it was received from the previous generation.
In the future banks, when finance is considered for projects that may harm the
environment, must take environmental as well as economical factors into
account. Purely economical reasons cannot be the only relevant factor.
Development that is financially sound will have to be weighed up against
social factors as well as the impact that it will have on the environment.
Section 28 of NEMA places a general duty of care on every person who
causes, has caused or may cause significant pollution or degradation of the
environment to prevent such pollution or degradation from occurring,
continuing or recurring. The persons saddled with the duty of care are the
owner, the person in control, or the person who has the right to use land or
premises. Banks may, under certain circumstances, be considered to be the
owner, person in control, or even the person who has the right use land or
premises. The polluter pays principle is introduced by section 28 as a basis for
liability but the principle is expanded to include, not only the polluter, but also
entities, such as banks, who in no way whatsoever, contributed to pollution or
degradation. NEMA affords no protection to banks in cases where banks
became owner of land by virtue of their security interest in the property. By
following established commercial practices, banks may be held liable for
environmental damage caused by their clients or erstwhile clients.
The traditional role of banks as financial institutions has to change because of
the duty placed on banks by the Constitution and NEMA to act as instruments
in the protection of the environment. By exerting their influence and by
implementing new procedures banks will be able to draw the attention of
prospective clients to the need to comply with environmental legislation.
In terms of the 2002 Directive of the European Union, the operator who directs
an operation by which damage is caused can be held liable for environmental
damage. It is necessary to prove that the bank exercised operational control
over the business of the borrower. The 2002 Directive is more restrictive than
section 28 of NEMA.
CERCLA is the primary federal legislation dealing with pollution of hazardous
substances. The Environmental Protection Agency has the authority to recover
the costs for the reparation of damage to the environment. After the US v Fleet
Factors Corporation decision the position was that banks might be held liable if
their involvement with the management decisions of the borrower are such
that they are in a position to influence the decisions of the borrower. The Asset
Conservation Lender Liability and Deposit Insurance Protection Act of 1996
(ACA) changed the magnitude of the Fleet Factors decision. Provision is made
by ACA to exempt lenders who held security in terms of a secured creditor
exemption, on the condition that the property is alienated at the earliest
practicable commercially reasonable time after acquiring it. The requirement
for liability is that banks must exercise control over the day-to-day activities of
a borrower.
The Environmental Protection Act of 1990 in the United Kingdom states that
the owner (other than the mortgagee in possession) is the person who has the
right to receive the rent of the property if the property was let out. It includes
the occupier of the property. The test is whether such a person is in control of
the property. If the inference can be drawn that the lender is in control then it
can be held liable for environmental damage. EPA, CERCLA as well as the
Directive makes it clear that if sufficient control is exercised by a lender over
the business of a borrower it may be held liable for damage to the
environment.
The emphasis should rather be placed on the ability of banks, generally, to
influence borrowers than to hold them liable for damage caused to the
environment by borrowers. / Thesis (LL.M. (Import and Export Law))--North-West University, Potchefstroom Campus, 2005.
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Critical comparison of control techniques for a flight dynamics controller / Gustav OttoOtto, Gustav January 2011 (has links)
This dissertation covers the process of modelling and subsequently developing a flight
dynamics controller for a quad–rotor unmanned aerial vehicle. It is a theoretical study
that focusses on the selection of a controller type by first analysing the problem on a
system level and then on a technical level. The craft is modelled using the Newton–
Euler model, accounting for multiple reference frames to account for the interpretation
of orientation as seen by on–board sensors. The quad–rotor model and selected controllers
are characterized and compared. The model is verified through simulation by
comparison to a validated model. A series of generic control loops are derived and
used as reference for the implementation of the controllers. A Simulator is developed
and used to do a comparative study of the various controller types and the control
approach. Finally a full simulation is done to demonstrate the interaction between the
controllers. / Thesis (MIng (Computer and Electronical Engineering))--North-West University, Potchefstroom Campus, 2012.
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Critical comparison of control techniques for a flight dynamics controller / Gustav OttoOtto, Gustav January 2011 (has links)
This dissertation covers the process of modelling and subsequently developing a flight
dynamics controller for a quad–rotor unmanned aerial vehicle. It is a theoretical study
that focusses on the selection of a controller type by first analysing the problem on a
system level and then on a technical level. The craft is modelled using the Newton–
Euler model, accounting for multiple reference frames to account for the interpretation
of orientation as seen by on–board sensors. The quad–rotor model and selected controllers
are characterized and compared. The model is verified through simulation by
comparison to a validated model. A series of generic control loops are derived and
used as reference for the implementation of the controllers. A Simulator is developed
and used to do a comparative study of the various controller types and the control
approach. Finally a full simulation is done to demonstrate the interaction between the
controllers. / Thesis (MIng (Computer and Electronical Engineering))--North-West University, Potchefstroom Campus, 2012.
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A model predictive control strategy for load shifting in a water pumping scheme with maximum demand chargesVan Staden, Adam Jacobus 24 August 2010 (has links)
The aim of this research is to affirm the application of closed-loop optimal control for load shifting in plants with electricity tariffs that include time-of-use (TOU) and maximum demand (MD) charges. The water pumping scheme of the Rietvlei water purification plant in the Tshwane municipality (South Africa) is selected for the case study. The objective is to define and simulate a closed-loop load shifting (scheduling) strategy for the Rietvlei plant that yields the maximum potential cost saving under both TOU and MD charges. The control problem is firstly formulated as a discrete time linear open loop optimal control model. Thereafter, the open loop optimal control model is converted into a closedloop optimal control model using a model predictive control technique. Both the open and closed-loop optimal control models are then simulated and compared with the current (simulated) level based control model. The optimal control models are solved with integer programming optimization. The open loop optimal control model is also solved with linear programming optimization and the result is used as an optimal benchmark for comparisons. Various scenarios with different simulation timeouts, switching intervals, control horizons, model uncertainty and model disturbances are simulated and compared. The effect of MD charges is also evaluated by interchangeably excluding the TOU and MD charges. The results show a saving of 5.8% to 9% for the overall plant, depending on the simulated scenarios. The portion of this saving that is due to a reduction in MD varies between 69% and 92%. The results also shows that the closed-loop optimal control model matches the saving of the open loop optimal control model, and that the closed-loop optimal control model compensates for model uncertainty and model disturbances whilst the open loop optimal control model does not. AFRIKAANS : Die doel van hierdie navorsing is om die applikasie van geslote-lus optimale beheer vir las verskuiwing in aanlegte met elektrisiteit tariewe wat tyd-van-gebruik (TVG) en maksimum aanvraag (MA) kostes insluit te bevestig. Die water pomp skema van die Rietvlei water reiniging aanleg in die Tshwane munisipaliteit (Suid-Afrika) is gekies vir die gevalle studie. Die objektief is om 'n geslote-lus las verskuiwing (skedulering) strategie vir die Rietvlei aanleg te definieer en te simuleer wat die maksimum potensiaal vir koste besparing onder beide TVG en MA kostes lewer. Die beheer probleem is eerstens gevormuleer as 'n diskreet tyd lineêre ope-lus optimale beheer model. Daarna is die ope-lus optimale beheer model aangepas na ‘n geslote-lus optimale beheer model met behulp van 'n model voorspellende beheer tegniek. Beide die ope- en geslote-lus optimale beheer modelle is dan gesimuleer en vergelyk met die huidige (gesimuleerde) vlak gebaseerde beheer model. Die optimisering van optimale beheer modelle is opgelos met geheeltallige programmering. Die optimisering van die ope-lus optimale beheer model is ook opgelos met lineêre programmering en die resultaat is gebruik as 'n optimale doelwit vir vergelykings. Verskeie scenarios met verskillende simulasie stop tye, skakel intervalle, beheer horisonne, model onsekerheid en model versteurings is gesimuleer en vergelyk. Die effek van MA kostes is ook geevalueer deur inter uitruiling van die TVG en MA kostes. Die resultate toon 'n besparing van 5. 8% tot 9% vir die algehele aanleg, afhangend van die gesimuleerde scenarios. Die deel van die besparing wat veroorsaak is deur 'n vermindering in MA wissel tussen 69% en 92%. Die resultate toon ook dat die geslote-lus optimale beheer model se besparing dieselfde is as die besparing van die ope-lus optimale beheer model, en dat die geslote-lus optimale beheer model kompenseer vir model onsekerheid en model versteurings, terwyl die ope-lus optimale beheer model nie kompenseer nie. Copyright / Dissertation (MEng)--University of Pretoria, 2010. / Electrical, Electronic and Computer Engineering / unrestricted
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Die belewenis van enkelouerskap deur die vader met beheer en toesig oor kinders in die middelkinderjare (Afrikaans)Mc Donald, Marna 12 April 2010 (has links)
ENGLISH : Modern fathers often insist that men and women receive equal child rearing responsibilities during marriage and after divorce. It is therefore important to an increasing number of fathers in divorce proceedings, to be considered in the ruling over custody of the child/ren. Research with reference to single fathers and as head of a family was until recently limited. The goal of the research was to explore the experiences of single parenthood by the father with custody of children in their middle childhood years. A qualitative research approach was considered as the most appropriate approach for this study, since the aim of the study was to understand “the world” of the divorced father with custody of his child/ren in their middle childhood years. Furthermore, the aim of the study was to determine how single fathers experience parenthood and how it influences their lives. Through purposive sampling six (N=6) single fathers with custody of their child/ren in their middle childhood years were involved in the study. The researcher conducted a semistructured interview with each of the identified fathers. The researcher managed to compile a theoretical framework regarding custody, the effect of the divorce on a parent as well as the child/ren in the middle childhood years and the experience of single parenthood by the single father, by means of a literature study and discussions with experts. A decade ago, single parent families with the father as the head were a rare phenomenon. The situation is starting to change as the courts are more willing to grant divorced fathers custody of their child/ren. In the past, it was the norm that custody of the children was automatically granted to mothers. At present, the courts are using the best interest of the child/ren; and the ability of a parent to care for the child/ren as guideline. Since it is not always easy for the court to determine which parent should be granted custody of the child/ren, reports from social workers as well as the family advocate are requested. If one of the parties oppose the ruling, a report from a psychologist may be requested. During the empirical study, the data was analysed. The semi-structured interviews made it possible for the researcher to follow up particular themes that emerged from the interviews, while the participants were able to give a fuller picture. Each of the interviews was transcribed and processed according to Creswell’s qualitative data-analysing process. In view of the research information the researcher reached the conclusion that the fathers are successfully fulfilling their roles as single parents. The single fathers do experience role strain but with the assistance of their established support systems they manage to master their roles and tasks. As devoted fathers they wanted to continue full-time parenting after their divorce. The fathers are willing to make the necessary sacrifices and changes that come with single parenthood. They acknowledge that there are challenges but that the positive outweighs the negative. For future research, it is recommended that a bigger sample of single fathers with custody of their child/ren in their middle childhood years should be researched to obtain representative data in terms of fathers’ experiences of single parenthood. The father’s child/ren, family members and domestic workers can also be included in future research in order to provide valuable information about the role of the single father and the impact on the father’s functioning. AFRIKAANS : Hedendaagse vaders dring dikwels daarop aan dat mans en vroue gelyke kinderopvoedingsverantwoordelikhede geniet tydens getroude lewe en ná egskeiding. Dit is gevolglik vir ‘n toenemende aantal vaders in egskeidingsgedinge belangrik om in aanmerking geneem te word met die beslissing oor die beheer en toesig van die kind/ers. Navorsing met betrekking tot vaders as enkelouers en hoof van die gesin, was tot onlangs beperk. Die doelstelling van die navorsing was om die belewenis van enkelouerskap deur die vader met beheer en toesig oor kinders in die middelkinderjare te ondersoek. ‘n Kwalitatiewe navorsingsbenadering is as die geskikste navorsingsbenadering vir hierdie studie beskou aangesien die doel van die studie was om die geskeide vaders, wat beheer en toesig verkry het oor hulle kind/ers in die middelkinderjare, se leefwêrelde te begryp. Voorts is daar met die studie beoog om vas te stel hoe geskeide vaders enkelouerskap beleef en hulle lewens daardeur beïnvloed word. Ses (N=6) geskeide vaders aan wie beheer en toesig van middeljarige kind/ers toegeken is, is deur middel van ‘n doelgerigte steekproeftrekking by die ondersoek betrek. Die navorser het met elk van hierdie vaders ‘n semi-gestruktureerde onderhoud gevoer. Met behulp van literatuurstudie en gesprekke met kundiges het die navorser daarin geslaag om ‘n teoretiese raamwerk saam te stel ten opsigte van beheer en toesig, die effek van egskeiding op ‘n ouerpaar en ‘n kind in die middelkinderjare, asook die belewenis van enkelouerskap deur die vader. Tien jaar gelede was enkelouergesinne met ‘n vader aan die hoof ‘n vreemde verskynsel. Die situasie is egter besig om te verander soos die howe geredeliker beheer en toesig van kinders aan geskeide vaders toevertrou. In die verlede was die norm dat beheer en toesig van kinders outomaties aan moeders toegeken word. Tans gebruik howe egter die kind/ers se belange, en die ouers se vermoë om na die kind/ers om te sien, as riglyn. Aangesien dit nie altyd maklik is om te bepaal watter ouer beheer en toesig oor die kind/ers behoort te kry nie, word verslae deur maatskaplike werkers, asook ‘n aanbeveling van die gesinsadvokaat aangevra. Indien een van die partye die bevindinge teëstaan kan ‘n verslag deur ‘n sielkundige aangevra word. Tydens die empiriese studie is die inligting geanaliseer. Die semi-gestruktureerde onderhoude het die navorser in staat gestel om sekere temas, wat tydens die onderhoude na vore gekom het, op te volg, terwyl die respondente in staat gestel is om hul omvattende verhaal te vertel. Elk van die onderhoude is getranskribeer en ooreenkomstig Cresswell se kwalitatiewe data-analiseproses verwerk. Op grond van die navorsingsbevindinge kom die navorser tot die gevolgtrekking dat vaders hulle goed van hul taak kwyt as enkelouers. Die enkelvaders ervaar rolspanning, maar met behulp van goed gevestigde ondersteuningstelsels slaag hulle daarin om die rolle en take te bemeester. As toegewyde vaders wou hulle graag hul ouerskap voortsit ná die egskeiding. Die vaders is bereid om die nodige opofferinge en veranderinge te maak wat ouerskap van hulle vereis. Hulle erken wel dat dit nie sonder uitdagings is nie, maar die positiewe weeg vir hulle meer as die negatiewe. Vir toekomstige navorsing word aanbeveel dat navorsers op ‘n groter aantal enkelouervaders met beheer en toesig oor hulle kind/ers in die middelkinderjare fokus om sodoende meer verteenwoordigende inligting te bekom oor hierdie vaders se belewenis van enkelouerskap. Die vaders se kind/ers, familielede, vriende en huishulpe kan ook betrek word by toekomstige navorsing, aangesien hulle waardevolle inligting kan verskaf oor die rol van die enkelvader en die impak daarvan op sy funksionering. Copyright / Dissertation (MSW)--University of Pretoria, 2010. / Social Work and Criminology / unrestricted
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Die identifisering van veerkragtigheid en nie-veerkragtigheid by die middel-adolessent in ‘n voormalige Model C-skool (Afrikaans)Parsons, Joreta 05 September 2005 (has links)
The purpose of this study was to develop a way of identifying resilient and non-resilient middle-adolescent learners, by means of an instrument or otherwise, in a former Model C-school. The research paradigm is pragmatism and a methodology of mixed methods was used. A questionnaire was developed and qualitative interviews were conducted to verify the results of the questionnaire. The theoretical framework of resilience as well as the developmental phase of middle-adolescence were studied. After conducting a pilot study, the necessary changes were made and an experimental version of the questionnaire was compiled on the basis of Kumpfer’s Transactional Model. This framework includes both processes and outcomes and six main constructs were specified, viz. stressors or challenges, the environmental context, person-environment-transactional process, internal resilience factors, resilience processes and outcomes or means of reintegration. Focus was placed on internal resilience factors. The “Veerkragtigheidsvraelys vir Middel-adolessente (toets)” (VVM-A(t)) (Resilience Questionnaire for Middleadolescents (test)), was compiled consisting of forty two self-evaluation questions using a continuum scale. This self-evaluation scale gives the respondent the opportunity to respond on a continuum line between not like me at all and exactly like me. The place of research, a secondary school in an area reflecting the diversity of the South-African population, was selected by means of convenience sampling and all the grade 8 and 9 learners (294 participants) completed the VVM-A(t). Two factors were identified by means of factor analysis viz. internal locus of control and external locus of control. The VVM-A, consisting of 22 items, was finalised from these results and the participants’ scores were recalculated for the selected items. Interviews for the purpose of verification or rejection of the VVM-A were conducted with twelve participants, four from the group with high scores, four from the group with low scores and four learners that grouped near the median. The in-depth interviews confirmed the results on the VVM-A. This instrument can therefore be regarded as valid and reliable to identify the resilient and non-resilient middle-adolescent learner. / Dissertation (MEd (Educational Psychology))--University of Pretoria, 2006. / Educational Psychology / unrestricted
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Die invloed van diversiteit op die funksionering van skoolbeheerliggame in die Laingsburg onderwysstreek / Colin Raymond PedroPedro, Colin Raymond January 2014 (has links)
Membership of school governing bodies is a new experience for many communities in South
Africa, because the election system for school governing bodies was only introduced during
1997 for the purpose of a decentralised management and governing system for schools in
the country. The new dispensation of democracy brought about some unique challenges, for
example, how to deal with diversity effectively. In this sense, the successful management of
diversity in education is viewed as one ·of the toughest challenges in the South African education
system. The aforementioned challenge led to the rationale for this research, which
focused on the influence of diversity on the functionality of school governing bodies and how
to manage diversity in the school governing bodies from the Laingsburg education region.
The strategy for the research was based on a qualitative research approach that took the
form of an interactive investigation of the views and experiences of the participants in relation
to the research topic. The research was further undertaken from an interpretative approach
which is appropriate, because the social experiences of the participants were central
to this research. Some of the most important findings were that prejudices and stereotyping
with regard to diversity posed a stumbling block for the effective functioning of school governing
bodies. To the contrary, it was also found that the perspective of diversity as variety,
is an advantage due to the multiplicity of available talents and competencies which can be
utilised to the benefit of education. Policy frameworks for the management of diversity and
I
appropriate communication were also part of the findings that have an influence on the functionality
of school governing bodies. The recommendations included amongst other that all
role players should be represented in the school governing body; training is regarded as a
priority; members should be willing to accept the role of servant leadership and finally the
roles of the principal and school governing body should be clarified to avoid friction and possible
conflict. The value of the research is in the first place a contribution to a better understanding
of the concept of diversity and it also supports the management of diversity in
school governing bodies of rural areas. / MEd (Education Management), North-West University, Potchefstroom Campus, 2014
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