Rapid population growth and urbanisation has resulted in a drastic increase in the volume of waste produced by the World populace. The resulting pressure on the country’s somewhat underdeveloped waste management infrastructure emphasizes the need for waste management solutions which balance environmental protection with economic sustainability. Waste is seen as an unwanted or surplus by-product, emission or residue of any process or activity which has been discarded, accumulated or stored for the purpose of discarding or future processing. Hazardous waste is waste that may, by circumstance of use, quantity, concentration or inherent physical, chemical or infectious characteristics, cause ill-health or an increased mortality rate in humans, fauna and/or flora. General waste on the other hand, is waste that does not pose an immediate threat to human health or the environment. Currently household waste is considered general waste even though it may contain hazardous components such as fluorescent tubes and/or other household chemicals. Promulgation of NEM: WA (no 59 of 2008) provides instruments for the implementation of the steps taken by the Department of Environmental Affairs to improve waste management in South Africa. Successful implementation and enforcement of the act will place the country at the forefront of progressive international standards in waste management. One of South Africa’s largest environmental and waste management challenges remains the presence of historical, hazardous waste landfill sites. Characterisation of the dangers that these sites pose to the environment is providing extremely difficult and expensive, as is the ongoing maintenance and management of these facilities – placing economic strain on national municipalities. This study was done in two phases. The first related to the hazardous waste components of household waste that is being dumped at landfill site and the methods of classification, handling and dumping of hazardous waste have been investigated. All the legislation was taken into consideration to see if the landfill sites comply with the latest legislation. The second phase was a comparison between three landfill sites. The management, work activities and general appearance of the sites have been compared internally. Then a comparison have been done between the following landfill sites Kwaggasrand landfill site in Tshwane, Weltevreden landfill site in Brakpan and an ideal landfill site developed in accordance with the Minimum Requirements documents published by of DEAT in 1998. / Thesis (M.Sc. (Geography and Environmental Studies))--North-West University, Potchefstroom Campus, 2011.

Rapid population growth and urbanisation has resulted in a drastic increase in the volume of waste produced by the World populace. The resulting pressure on the country’s somewhat underdeveloped waste management infrastructure emphasizes the need for waste management solutions which balance environmental protection with economic sustainability. Waste is seen as an unwanted or surplus by-product, emission or residue of any process or activity which has been discarded, accumulated or stored for the purpose of discarding or future processing. Hazardous waste is waste that may, by circumstance of use, quantity, concentration or inherent physical, chemical or infectious characteristics, cause ill-health or an increased mortality rate in humans, fauna and/or flora. General waste on the other hand, is waste that does not pose an immediate threat to human health or the environment. Currently household waste is considered general waste even though it may contain hazardous components such as fluorescent tubes and/or other household chemicals. Promulgation of NEM: WA (no 59 of 2008) provides instruments for the implementation of the steps taken by the Department of Environmental Affairs to improve waste management in South Africa. Successful implementation and enforcement of the act will place the country at the forefront of progressive international standards in waste management. One of South Africa’s largest environmental and waste management challenges remains the presence of historical, hazardous waste landfill sites. Characterisation of the dangers that these sites pose to the environment is providing extremely difficult and expensive, as is the ongoing maintenance and management of these facilities – placing economic strain on national municipalities. This study was done in two phases. The first related to the hazardous waste components of household waste that is being dumped at landfill site and the methods of classification, handling and dumping of hazardous waste have been investigated. All the legislation was taken into consideration to see if the landfill sites comply with the latest legislation. The second phase was a comparison between three landfill sites. The management, work activities and general appearance of the sites have been compared internally. Then a comparison have been done between the following landfill sites Kwaggasrand landfill site in Tshwane, Weltevreden landfill site in Brakpan and an ideal landfill site developed in accordance with the Minimum Requirements documents published by of DEAT in 1998. / Thesis (M.Sc. (Geography and Environmental Studies))--North-West University, Potchefstroom Campus, 2011.

In this study a linguistic investigation of the traditional colour terms of Northern Sotho was carried out. The research comprised three separate phases. In all three phases two aspects were emphasised, namely, the nature of the concept underlying each colour term and the nature and extent to which the selection requirements of the term affected the antecedent. In the first phase, the definitions of selected colour terms, as given in three standard Northern Sotho dictionaries, were studied and compared. These dictionaries included: Pukuntšu, The New Sesotho Dictionary and the Groot Noord-Sotho Woordeboek. Special reference was made to (a) the description of colour as given in the definition, and (b) the selection requirements with regard to the antecedent. The concept “colour term” itself is problematic as the definitions of these terms encompass more than mere references to colour. When comparing the definitions of these terms in Northern Sotho dictionaries, however, little unanimity could be found regarding: (a) the the concept underlying the colour terms, and (b) the selection requirements of these terms in respect of the antecedent. In phase two, six mother-tongue speakers of Northern Sotho were interviewed. The descriptions of the colour terms provided by these respondents were then analysed in the same manner as that of the dictionaries. The informants were all professional people with notable linguistic ability and knowledge of livestock. An Electronic Data Base (compiled by the Department of African Languages, University of Pretoria) was consulted in the third phase of study. The objective of this phase was to collect data on the frequency of use of these colour terms and in light of this to make deductions on their selection requirements. Finally, a synthesis was made of the information collected during the three phases. As indicated above, this is a practical study falling within the ambit of the science of language-usage. At most it can be claimed that the conceptualisation of colour and the manner in which it is reflected in language, has a psycho-linguistic basis. As a result of the nature of the study, it could not always be carried out within a strict theoretical framework. / Dissertation (M A (African Languages))--University of Pretoria, 2005. / African Languages / unrestricted

On-chip impedance tuning is used to overcome IC perturbations caused by packaging stress. Tuning is more important for matching networks of radio frequency (RF) systems. Possible package resonance and fabrication process variations may cause instability, which is a major problem in RF systems. Thus, precautions need to be taken in order to maintain the overall stability of components and the final system itself. Electrically erasable programmable read-only memory switches (EEPROMs) occupy less die area compared to e-fuses and microelectromechanical system (MEMS) switches, thus EEPROMs are proposed to be used as tuning switches in millimetre-wave (mm-wave) applications. It is anticipated that EEPROM switches will also enable multi-time programming because of the smaller area and the fact that more switches can be used for fine-tuning. The problem addressed in this research is how suitable EEPROMs are for switching applications in the mm-wave region. The main focus of this dissertation is to characterise the suitability of EEPROM switches qualitatively for tuning with systems operating in the mm-wave spectrum. 130 nm SiGe BiCMOS IBM 8HP process technology was used for simulation and the fabricated prototypes. The Dickson charge pump (CP), two voltage doubler CPs and four floating gate (FG) devices were investigated. Literature and theoretical verification was done using computer aided design (CAD) Cadence software through circuit analysis and the layouts were also designed for integrated circuit (IC) prototype fabrication. The qualitative evaluation of the hypothesis was based on investigating reliability issues, switching characteristics, CP output drive capability and mm-wave characterisation. The maximum measured drain current for FGs was 1.4 mA, 2.7 mA and 3 mA for devices 2, 3 and 4, respectively. The ratio between ON state switching current (after tunnelling) and OFF state switching current (after injection) was 1.5, 1.35 and 6 for devices 2, 3 and 4, respectively. The ratios correlated with the expected results in terms of FG transistor area: a high area results in a higher ratio. Despite the correlation, devices 2 and 3 may be unsuitable because the ratio is less than 2: a smaller ratio between the ON and OFF states could also result in higher losses. The Dickson CP achieved an output voltage of 2.96 V from an input of 1.2 V compared to 3.08 V as computed from the theoretical analysis and 4.5 V from the simulation results. The prototypes of the voltage doubler CP did not perform as expected: a maximum of 1 V was achieved compared to 4.1 – 5 V as in the simulation results. The suitability of FG devices for switching applications depends on the ratio of the ON and OFF states (associated to insertion and isolation losses): the larger the FG transistor area, the higher the ratio. The reliability issues are dominated by the oxide thickness of the transistor, which contributes to charge leakages and charge trapping: smaller transistor length causes more uncertainties. Charge trapping in the oxide increases the probability of leakages and substrate conduction, thus introduces more losses. Based on the findings of this research work, the FG devices promise to be suitable for mm-wave switching applications and there is a need for further research investigation to characterise the devices in the mm-wave region fully. AFRIKAANS : Impedansie-instelling op skyf word gebruik om steurings in geïntegreerde stroombane wat deur verpakkingstres veroorsaak word, te oorkom. Instelling is meer belangrik om netwerke van radiofrekwensiesisteme te paar. Moontlike verpakkingresonansie en variasies in die vervaardigingsproses kan onstabiliteit veroorsaak, wat ‟n groot probleem is in radiofrekwensiesisteme. Voorsorg moet dus getref word om die oorhoofse stabiliteit van komponente en die finale sisteem self te handhaaf. Elektries uitveebare programmeerbare slegs-lees-geheueskakelaars (EEPROMs) neem minder matrysarea op as e-sekerings en die sekerings van mikro-elektromeganiese sisteme en word dus voorgestel vir gebruik as instellingskakelaars in millimetergolfaanwendings. Daar word verwag dat EEPROM-skakelaars ook multi-tydprogrammering sal moontlik maak as gevolg van die kleiner area en die feit dat meer skakelaars gebruik kan word vir fyn instellings. Die probleem wat in hierdie navorsing aandag geniet, is die geskiktheid van EEPROMS vir skakelaanwendings in die millimetergolfstreek. The hooffokus van die verhandeling is om die geskiktheid van EEPROM-skakelaars kwalitatief te karakteriseer vir instelling met sisteme wat in die millimetergolfspektrum funksioneer. Department of Electrical, Electronic and Computer Engineering v University of Pretoria 130 nm SiGe BiCMOS IBM 8HP-prosestegnologie is gebruik vir simulasie en die vervaardigde prototipes. Die Dickson-laaipomp is gebruik vir simulasie en die vervaardigde prototipes. Die Dickson-laaipomp, twee spanningverdubbelinglaaipompe en vier swewendehektoestelle is ondersoek. Literatuur- en teoretiese verifikasie is gedoen met behulp van rekenaarondersteunde-ontwerp (CAD) Cadence-sagteware deur stroombaananalise en die uitleg is ook ontwerp vir die vervaardiging van geïntegreerdestroombaanprototipes. Die kwalitatiewe evaluasie van die hipotese is gebaseer op die ondersoek van betroubaarheidkwessies, skakelingeienskappe, laaipompuitsetdryfvermoë en millimetergolfkarakterisering. Die maksimum gemete dreineerstroom vir swewende hekke was 1.4 mA, 2.7 mA en 3 mA vir onderskeidelik toestelle 2, 3 en 4. Die verhouding tussen die AAN-toestand van die skakelstroom (na tonnelling) en die AF-toestand van die skakelstroom (na inspuiting) was 1.5, 1.35 en 6 vir toestelle 2, 3 en 4, onderskeidelik. Die verhoudings het ooreengestem met die verwagte resultate rakende die swewendehek-transistorareas: ‟n groot area het ‟n hoër verhouding tot gevolg. Nieteenstaande die ooreenstemming, mag toestelle 2 en 3 moontlik nie geskik wees nie, omdat die verhouding kleiner as 2 is: ‟n kleiner verhouding tussen die AAN- en AF-toestande mag ook hoër verliese tot gevolg hê. Die Dickson-laaipomp het ‟n uitsetspanning van 2.96 V vanaf ‟n inset van 1.2 V vergeleke met 3.08 V soos bereken volgens die teoretiese analise en 4.5 V volgens die simulasieresultate. Die prototipes van die spanningverdubbelinglaaipomp het nie gefunksioneer soos verwag is nie: ‟n maksimum van 1 V is bereik vergeleke met 4.1 – 5 V soos in die simulasieresultate. Die geskiktheid van swewendehektoestelle vir skakelingtoepassings hang af van die verhouding van die AAN- en AF-toestande (wat met invoer-en isolasieverlies geassosieer word): hoe groter die swewendehektransistorarea, hoe hoër die verhouding. Die betroubaarheidkwessies word oorheers deur die oksieddikte van die transistor, wat bydra tot ladinglekkasies en ladingvasvangs: korter transistorlengte veroorsaak meer onsekerheid. Ladingvasvangs in die oksied verhoog die moontlikheid van lekkasies en substraatgeleiding en veroorsaak dus groter verlies. Die bevindings van hierdie navorsing toon dat swewendehektoestelle waarskynlik geskik is vir millimetergolfaanwendings en verdere navorsing is nodig om die toestelle volledig in die millimetergolfstreek te karakteriseer. Copyright / Dissertation (MEng)--University of Pretoria, 2013. / Electrical, Electronic and Computer Engineering / unrestricted

This study focuses on the following schizophrenic related elements to be found in the postmodern society and to be represented in selected contemporary video artworks: 1) creation of an alternative world and 2) disturbance in meaning. To confirm that the creation of an alternative world and disturbance in meaning is present in postmodern society, the following elements are investigated as symptoms of schizophrenia and characteristics present in contemporary society: 1) fragmentation, 2) withdrawal from reality, 3) misinterpretation of memories and 3) the creation of 'word salad'. In order to draw a parallel between schizophrenia and the postmodern society, the postmodern theories of Simon Gottschalk, Fredric Jameson, Kenneth Gergen, Jean Baudrillard, Andreas Huyssen, Gilles Deleuze en Paul Virilio as well as the medical studies involving schizophrenia by the Schizophrenia Foundation of South Africa, the University of Iowa se Department of Healthcare and D Sue, DW Sue en S Sue are used. In both conditions of schizophrenia and postmodern society, reality and meaning are altered. This study concludes that schizophrenic related elements are present in the postmodern society and therefore these elements are represented in the selected video artworks of the artists Eija-Liisa Ahtila and myself.AFRIKAANS : Hierdie studie fokus op die skisofrenie-verwante elemente wat voorkom in die postmoderne samelewing naamlik: 1) alternatiewe wêreldskepping en 2) versteuring in betekenisgewing en wat uitgebeeld word in geselekteerde kontemporêre videokunswerke. Fragmentering, onttrekking van realiteit, waninterpretasie van herinneringe en die skepping van 'woordslaai' word as simptome van skisofrenie en as kenmerkende eienskappe in die postmoderne samelewing ondersoek om die argument te versterk dat alternatiewe wêreldskepping en versteuring in betekenisgewing teenwoordig is in die postmoderne samelewing. Die postmoderne teorieë van Simon Gottschalk, Fredric Jameson, Kenneth Gergen, Jean Baudrillard, Andreas Huyssen, Gilles Deleuze en Paul Virilio sowel as die mediese studies deur die Schizophrenia Foundation of South Africa, die University of Iowa se Department of Healthcare en D Sue, DW Sue en S Sue aangaande skisofrenie, word gebruik om parallelle tussen die postmoderne samelewing en die mediese toestand van skisofrenie in hierdie studie te trek. Daar word vasgestel dat realiteit en betekenis in beide toestande van skisofrenie en die postmoderne samelewing verbuig en hervorm word. Die gevolgtrekking van hierdie studie is dat skisofrenie-verwante elemente wel voorkom in die kontemporêre samelewing en dus uitgebeeld word in die geselekteerde videokunswerke van die kunstenaars Eija-Liisa Ahtila en myself. / Dissertation (MA)--University of Pretoria, 2006. / Visual Arts / unrestricted