106,245 research outputs found
Perceived impact of online social support on self-regulatory weight-loss behaviour in a sample of young South African adults
No full textMA (Counselling Psychology), North-West University, Potchefstroom Campus, 2018Weight loss during young adulthood is a challenge that necessitates deliberate and conscious decision making and self-regulation. The aim of this qualitative study was to explore the perceived relationship between online social support and self-regulation of specific weight loss goals in a sample of 15 young South Africans adults. Participants completed a self-compiled open-ended questionnaire on SurveyMonkey. Findings show that participants rely on social media sites to obtain their weight loss goals due to their accessibility, convenience, affordability, as well as their informative and emotionally supportive nature. Participants perceive social media generally as effective, despite certain challenges, in facilitating key self-regulatory skills and ultimately in the achievement of their weight loss goals. The findings are compared to previous research, limitations are discussed and recommendations for further research are madeMaster
De Onderhandelingen van Lord Kitchener en Louis Botha, zooals de commandant-generaal Louis Botha mij deze gebeurtenis verteld heeft
No full textleyds-29436.pdf created from original pamphlet in the WJ Leyds Collection held in the Africana Section of the Stellenbosch University Library and Information Service.Dutch newspaper article on peace negotiations between Lord Kitchener and Louis Botha in February 1901
Extreme ultraviolet emission lines of Ni xii in laboratory and solar spectra
No full textA linear force-free field solution is presented in cylindrical coordinates, formulated in terms of trigonometric and Bessel functions. A numerical exploration has revealed that this solution describes magnetic field lines that meander in Cartesian space, as well as field lines that lie on toroidal flux surfaces. These tori are in (or close to) the plane perpendicular to the cylindrical axis. Nested tori, as well as tori with shells that have finite thickness, were found. The parameter space of the solution shows that the tori exist within a bounded range of values
Festschrift Rufus H. Gouws
No full textCITATION: Botha, W., Mavoungou, P. & Nkomo, D. (eds.). 2013. Festschrift Rufus H. Gouws. Stellenbosch: SUN PReSS. doi:10.18820/9781920338978.The original publication is available from AFRICAN SUNMeDIA - www.sun-e-shop.co.zaAFRIKAANSE VOORWOORD: Die gevoel was dat hierdie bundel aan oudstudente van Rufus Gouws die geleentheid sal gee om op gepaste wyse hul dank en waardering teenoor hom te betoon. Magister- en doktorale studente van 1986 tot Desember 2012 was almal geesdriftig oor 'n huldigingsbundel vir iemand wat veel meer as hul dosent en studieleier is.ENGLISH PREFACE: The intention was that this compilation might provide former students of Rufus Gouws with the opportunity to express their appreciation towards him.
Masters and doctoral students from 1986 to December 2012 were all enthusiastic about a celebratory volume for someone who had been much more than their lecturer and supervisor.FRENCH PRéFACE: L'intention était qu’à travers cette publication, les anciens étudiants de Rufus Gouws aient la possibilité de lui exprimer leur gratitude. Les étudiants de
Master et de Doctorat de 1986 à décembre 2012 étaient tous enthousiastes à l'idée d'un mélange en l’honneur de quelqu'un qui a été beaucoup plus que leur enseignant et superviseur.Publishers' versio
General Louis Botha: farmer, soldier, statesman, 1862–1919
No full textThesis (PhD)--Stellenbosch University, 2020.ENGLISH ABSTRACT: Louis Botha (1862-1919) is a towering figure on the South African historical landscape. Raised as a farmer in Natal and the Free State, he rose to prominence through a combination of military service and government office and became successively the premier Boer combat general and later a British lieutenant general, premier of the Transvaal Colony, and then the first prime minister of the Union of South Africa. Botha’s influence on South Africa, and the wider British Empire, is recorded in the five existing biographies. While these works explain aspects of his life, they do not provide a comprehensive academic study. This dissertation bridges that gap in the discourse.
Three of the Botha biographies - those of Harold Spender, Sydney Buxton and Frans Engelenburg – were written by colleagues and contemporaries, while the remaining two biographers – Johannes Meintjes and (more recently) Richard Steyn had no personal connection. Collectively these works are not archival studies, lack the customary academic apparatus, and mostly treat particular aspects of Botha’s life, as do the other studies that focus on Botha’s role during specific periods of his career, including but not limited to the Anglo-Boer War, the political development of the Transvaal and the Union of South Africa, as well as the Afrikaner Rebellion and First World War campaign in German South West Africa. This dissertation bridges this gap by providing a critical examination of the political and military career of Louis Botha, in a full-length portrait. It is, at the same time, a reappraisal, providing a fresh look at the man who helped shape modern South Africa. It offers new insights into his life and highlights both the positive and the negative aspects of his dealings. The man lionised for his military prowess, political nous, and governing competence, was at the same time badly flawed, wavering at times, and making crucial errors, side-lining whole sectors of South African society and sacrificing people of colour on the altar of ‘white’ unity. Botha was very human, imperfect, inconsiderate, and insecure, but he was also charming, attractive, emotionally intelligent, and confident. Botha was thus a complex man, general, administrator, politician, visionary leader, patriarch and racist who lived by the norms of his time, while moulding the agenda for a modernising South Africa.
Botha is painted by some as the charming farmer and accidental politician. This dissertation provides an alternate view. He was undoubtedly a successful farmer and he proved to be an effective minister of agriculture. But he had realised too that his personal passion provided a lever of power. His career was founded in the old commando tradition that linked farming and landowning, to military service, government office and economic and further political opportunity. While he excelled at farming, military service and its reward brought territorial aggrandisement and social escalation. From landowner, Botha became a veld cornet, and this led him into the meeting hall of the Transvaal volksraad. From there, harnessing the opportunities presented by the Anglo-Boer War, he rose rapidly in rank to become the Transvaal commandant general, a position that he converted after the war into political office. Towards the end of his career, when South African prime minister, he once again had the opportunity to combine military command and conquest with territorial acquisition but in the name of a greater South Africa.AFRIKAANSE OPSOMMING: Louis Botha (1862-1919) is ‘n lewensgrootte figuur op die Suid-Afrikaanse historiese landskap. Hy het groot geword as ‘n boer in Natal en die Vrystaat, en later prominentheid bereik deur ʼn kombinasie van militêre diens en regeringsampte. In so ‘n hoedanigheid was Botha ‘n prominente Boere veggeneraal, ‘n Britse luitenant-generaal, die premier van die Transvaalse Kolonie, asook die eerste minister van die Unie van Suid-Afrika. Botha se invloed op Suid-Afrika en die breër Britse Ryk is aangeteken in die vyf beskikbare biografieë oor hom. Dié bronne bespreek slegs sekere aspekte van sy lewe, en is nie akademies van aard nie. Hierdie proefskrif vul die leemte in die breër diskoers rondom Botha.
Drie van die Botha biografieë – naamlik die van Harold Spender, Sydney Buxton en Frans Engelenburg H. Spender, Lord Buxton – was geskryf deur sy kollegas en tydgenote, terwyl die skrywers van die ander twee biografieë – Johannes Meintjes en, meer onlangs, Richard Steyn – geen persoonlik verhouding met Botha gehad het nie. Nie een van die bronne is gebaseer op deeglike argivale navorsing nie, en bied ook geen akademiese analise nie. Inteendeel bied elk van die biografieë, asook meeste ander bronne, slegs ‘n blik op sekere aspekte van Botha se lewe, byvoorbeeld sy rol in die Anglo-Boereoorlog, die politieke ontwikkeling van beide die Transvaal en die Unie van Suid-Afrika, asook die Afrikaner Rebellie en die Eerste Wêreldoorlog veldtog in Duits Suidwes-Afrika. Hierdie proefskrif vul dus ‘n duidelike leemte, en bied ‘n kritiese analise oor die politieke en militêre loopbaan van Louis Botha as ‘n vollengte skets. Ter selfde tyd is dit ‘n herwaardering van een van die sleutelfigure wat gehelp het om die moderne Suid-Afrika te vorm. Talle nuwe insigte oor Botha se lewe kom na vore, beide positief en negatief. Die man wat opgehef was vir sy militêre bekwaamheid, politieke intellek, en regerings bevoegdheid, was terselfdertyd ook erg gebrekkig, wankelend by tye, het soms kritiese foute gemaak, het groot dele van die samelewing vervreem, en het nie-blankes te na gekom ter wille van blanke-eenheid. Botha was dus menslik, imperfek, onbedagsaam, en onseker, maar hy was ook sjarmant, aantreklik, intelligent, en selfversekerd. Hy was ‘n komplekse man, generaal, administrateur, politikus, visionêre leier, patriarg, en rassis, wat gelewe het volgens die norms van die tyd, alles terwyl hy besig was om die voetwerk te doen vir die modernisering van Suid-Afrika.
Vir sommiges bly Botha ‘n sjarmante boer en toevallige politikus. Die proefskrif bied egter ‘n alternatiewe blik op Botha. Hy was ongetwyfeld ‘n suksesvolle boer en later ‘n effektiewe minister van landbou. Hy het egter gou besef dat sy persoonlike passies vir hom mag kon verseker. Sy loopbaan was stewig gevestig op die kommando-tradisie, waar boerdery en grond besit gekoppel was aan militêre diens, regeringsamp, asook ekonomiese en ander voordele. Terwyl Botha ‘n suksesvolle boerdery bedryf het, het hy as beloning vir militêre diens meer eiendom en status bekom. Omdat hy ‘n grondeienaar was, is Botha bevorder tot veldkornet, wat hom toegang gegee het tot die Transvaalse volksraad. Botha het gebruik gemaak van elke moontlike geleentheid tydens die Anglo-Boereoorlog. Teen die einde van die oorlog was hy die Kommandant Generaal van die Transvaal – ‘n posisie wat hy na afloop van die oorlog na ‘n politieke amp verander het. Later in sy lewe, as die Eerste Minister van Suid-Afrika was, het Botha weereens die geleentheid gehad om militêre bevel te kon kombineer met die verkryging van groter grondgebied – maar die keer vir die ideaal van ‘n groter Suid-Afrika.Doctora
Towards the development of InAs/GaInSb strained-layer superlattices for infrared detection
No full textThis study focuses on the development of InAs/GaInSb strained-layer superlattice structures by metal organic chemical vapour deposition (MOCVD), and deals with two aspects of the development of InAs/GaInSb SLS’s by MOCVD viz. the deposition of nano-scale (~100 Å) GaInSb layers, and the electrical characterization of unstrained InAs. The first part of this work aims to study the MOCVD growth of GaInSb layers in terms of deposition rate and indium incorporation on the nano-scale. This task is approached by first optimizing the growth of relatively thick (~2 μm) epitaxial films, and then assuming similar growth parameters during nano-scale deposition. The GaInSb layers were grown as part of GaInSb/GaSb quantum well (QW) structures. By using this approach, the GaInSb QW’s (~100 Å) could be characterized with the use of photoluminescence spectroscopy, which, when used in conjunction with transmission electron microscopy and/or X-ray diffractomery, proves useful in the analysis of such small scale deposition. It is shown that the growth rate of GaInSb on the nano-scale approaches the nominal growth rates determined from thick (~2 μm) GaInSb calibration layers. The In incorporation efficiency in nano-layers, however, was markedly lower than what was predicted by the GaInSb calibration layers. This reduction in indium incorporation could be the result of the effects of strain on In incorporation. The choice of substrate orientation for QW deposition was also studied. QW structures were grown simultaneously on both (100) and 2°off (100) GaSb(Te) substrates, and it is shown that growth on non-vicinal substrates is more conducive to the deposition of high quality QW structures. The second part of this study focuses on the electrical characterization of unstrained InAs. It is long known that conventional Hall measurements cannot be used to accurately characterize InAs epitaxial layers, as a result of parallel conduction resulting from surface and/or interface effects. This study looks at extracting the surface and bulk electrical properties of n-type InAs thin films directly from variable magnetic field Hall measurements. For p-type InAs, the situation is complicated by the relatively large electron to hole mobility ratio of InAs which tends to conceal the p-type nature of InAs thin films from Hall measurements. Here, this effect is illustrated by way of theoretical simulation of Hall dat
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Numerical simulations of rotating axisymmetric sunspots
No full textA numerical model of axisymmetric convection in the presence of a vertical magnetic flux bundle and rotation about the axis is presented. The model contains a compressible plasma described by the non-linear MHD equations, with density and temperature gradients simulating the upper layer of the Sun's convection zone. The solutions exhibit a central magnetic flux tube in a cylindrical numerical domain, with convection cells forming collar flows around the tube. When the numerical domain is rotated with a constant angular velocity, the plasma forms a Rankine vortex, with the plasma rotating as a rigid body where the magnetic field is strong, as in the flux tube, while experiencing sheared azimuthal flow in the surrounding convection cells, forming a free vortex. As a result, the azimuthal velocity component has its maximum value close to the outer edge of the flux tube. The azimuthal flow inside the magnetic flux tube and the vortex flow is prograde relative to the rotating cylindrical reference frame. A retrograde flow appears at the outer wall. The most significant convection cell outside the flux tube is the location for the maximum value of the azimuthal magnetic field component. The azimuthal flow and magnetic structure are not generated spontaneously, but decay exponentially in the absence of any imposed rotation of the cylindrical domain
Lessons from Mr. Noki : empire, structural violence and the Missio Dei
No full textCITATION: Botha, J. 2020. Lessons from Mr. Noki : empire, structural violence and the Missio Dei, in Nel, M. J., Forster, D. A. & Thesnaar, C. H. (eds.) 2020. Reconciliation, forgiveness and violence in Africa : biblical, pastoral and ethical perspectives. Stellenbosch: SUN PReSS, doi:10.18820/9781928480532/06.The original publication is available from AFRICAN SUNMeDIA - www.sun-e-shop.co.zaOn the 16th of August 2012, 34 mineworkers were killed by police in a conflict
between Lonmin’s Marikana2 mine management and their workforce (Botha &
Forster, 2017). The leader of the striking miners, Mgecineni Noki,3 died that day
after advocating for basic increases and a more dignified life. This event has been
likened to the Sharpeville4 of the new South Africa.5 The situation was a boiling pot
consisting of a multinational company seeking best financial return at the expense
of the dignity of mine workers, radicalised unions, militarised police and the misuse
of political power, which resulted in violent and blatant murder as uncovered by
the Farlam Commission6 (Botha & Forster, 2017). What preceded this event is a
clear example of structural violence,7 and the subsequent strike was a reaction to this manifestation of violence. Mgecineni Noki’s life of struggle and his inhumane
death have come to serve as a symbol for all those who have lost their lives in such
conflicts, as well as those who are still held captive by an unjust social, political
and economic system. This chapter does not aim to go into detail about Mr. Noki’s
life, but use his social location as a lens to critique church8 engagement in issues of
violence that undermine the dignity of the most vulnerable peoples.Publisher's versio
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