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Cape Peninsula University of Technology
1.
Myburgh, Dirk Petrus.
The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2693 
► The production of biodiesel is an energy and water intensive process. The wastewater that is produced during this process is high in concentrations of COD,…
(more)
▼ The production of biodiesel is an energy and water intensive process. The wastewater that is produced during this process is high in concentrations of COD, BOD, FOG and various other contaminants. Since it contains low levels of nutrients, it is difficult to degrade using natural processes such as conventional activated sludge wastewater treatment. The discharge of untreated biodiesel wastewater also raises serious environmental concern. It interferes when remediated with biological processes and results in additional costs during the production of biodiesel when penalties and fines are applied. Conventional treatment processes are not capable of treating contaminants and pollutants in biodiesel to satisfactory concentrations and hence advanced treatment processes are necessary. In this research, a lab scale integrated treatment process was used to investigate the successful reduction of contaminants, in particular COD, BOD and FOG. The integrated treatment process used in this study consisted of three consecutive steps; acidification, electrochemical oxidation and adsorption using chitosan as an adsorbent. The electrochemical oxidation process with IrO2-Ta2O5/Ti anodes was applied to treat biodiesel wastewater. Different operating conditions were tested to establish favourable conditions. The current density applied as well as the concentration of NaCl as the supporting electrolyte greatly affected the process. A NaCl concentration of 0.08M was deemed sufficient, whereas a current density of 1 mA/cm² showed superior performance compared to lower or higher current densities.
Adsorption of pollutants in biodiesel wastewater was investigated using Chitosan as the adsorbent. Various chitosan concentrations, initial pH of the wastewater and repetitive adsorption stages were investigated. It was discovered that all three operating conditions greatly affect the performance of the process. The three consecutive adsorption stages using a chitosan concentration of 4.5 g/L at a pH of 2 resulted in the highest pollutant removal.
It was observed that the integrated treatment process could reduce COD, BOD and FOG levels by 94%, 86% and 95% respectively. This concludes that the treated effluent complies with local industrial effluent discharge standards, which could be disposed safely without further treatment.
Advisors/Committee Members: Aziz, M (advisor), Ojumu, TV (advisor).
Subjects/Keywords: Biodiesel fuels;
Factory and trade waste – Environmental aspects;
Biodiesel fuels – Environmental aspects;
Sewage – Purification;
Electrochemistry
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APA (6th Edition):
Myburgh, D. P. (2018). The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2693
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Myburgh, Dirk Petrus. “The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2693.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Myburgh, Dirk Petrus. “The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process
.” 2018. Web. 27 Feb 2020.
Vancouver:
Myburgh DP. The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2693.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Myburgh DP. The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2693
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
2.
Breuer, Evelyn Ndinelao.
Molecular characterisation of Mycobacterium Tuberculosis, clinical isolates obtained in the Khomas region, Windhoek, Namibia
.
Degree: 2017, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2692
► According to the Namibia National Tuberculosis Control Programme (NTCP) report of 2008, Namibia has one of the highest TB infection rates in the world with…
(more)
▼ According to the Namibia National Tuberculosis Control Programme (NTCP) report of 2008, Namibia has one of the highest TB infection rates in the world with a case notification rate of 748/100,000. Rapid, specific and sensitive diagnosis of Mycobacterium tuberculosis (MTB) is needed for correct TB patient management. One of the aims of this study was thus to compare direct microscopy with two rapid molecular diagnostic tools (viz. GeneXpert MTB/RIF and Hain Genotype® MTBDR plus assay) for the identification of MTB from samples collected from the Khomas Region, Windhoek, Namibia. Only patients with positive TB sputum collected at the clinics and health facilities in the Khomas Region, Windhoek were eligible for the study. Three hundred and eighty-four samples were confirmed acid-fast positive by utilising the auramine staining method. The rifampicin (RIF) resistance profile detected by both molecular techniques was then compared for characterisation of the samples as drug resistant. Lastly, participants completed a survey, which included questions related to demographic and epidemiological data. Demographic data included patient age, gender, region of residence and history of treatment. The data was collected using a structured questionnaire and was captured in an Excel spreadsheet. It was then imported into Statistical Package for Social Sciences (SPSS) Version 25 for data analysis. A memorandum of understanding was also signed with the Namibia Institute of Pathology (NIP) to obtain permission to use their samples and the equipment at their site.
Advisors/Committee Members: Khan, Sehaam (advisor).
Subjects/Keywords: Namibia National Tuberculosis Control Programme;
Mycobacterium tuberculosis;
Mycobacterium tuberculosis – Molecular aspects;
Mycobacterium tuberculosis – Treatment;
Mycobacterium tuberculosis – Diagnosis
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APA (6th Edition):
Breuer, E. N. (2017). Molecular characterisation of Mycobacterium Tuberculosis, clinical isolates obtained in the Khomas region, Windhoek, Namibia
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2692
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Breuer, Evelyn Ndinelao. “Molecular characterisation of Mycobacterium Tuberculosis, clinical isolates obtained in the Khomas region, Windhoek, Namibia
.” 2017. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2692.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Breuer, Evelyn Ndinelao. “Molecular characterisation of Mycobacterium Tuberculosis, clinical isolates obtained in the Khomas region, Windhoek, Namibia
.” 2017. Web. 27 Feb 2020.
Vancouver:
Breuer EN. Molecular characterisation of Mycobacterium Tuberculosis, clinical isolates obtained in the Khomas region, Windhoek, Namibia
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2017. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2692.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Breuer EN. Molecular characterisation of Mycobacterium Tuberculosis, clinical isolates obtained in the Khomas region, Windhoek, Namibia
. [Thesis]. Cape Peninsula University of Technology; 2017. Available from: http://etd.cput.ac.za/handle/20.500.11838/2692
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
3.
Ismail, Saaiga.
Anthropometric measurements versus computed tomography for the assessment of metabolic syndrome in the Bellville South mixed ancestry community, South Africa
.
Degree: 2017, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2691
► Background: Metabolic syndrome (MetS) is a clustering of cardiovascular disease (CVD) risk factors which include abdominal obesity, hyperglycaemia, hyper-triglyceridaemia, low HDL-cholesterol and hypertension. This cluster…
(more)
▼ Background: Metabolic syndrome (MetS) is a clustering of cardiovascular disease (CVD) risk factors which include abdominal obesity, hyperglycaemia, hyper-triglyceridaemia, low HDL-cholesterol and hypertension. This cluster of metabolic deviations is believed to be the primary driver of the double global epidemic of diabetes (DM) and CVD, conditions which account for much of the social and economic global burden of disease. Similar to the global trend, a high prevalence of MetS (62%) and type 2 Diabetes Mellitus (T2DM) (28.2%) has been reported for the South African mixed ancestry population, with CVD risk significantly higher in subjects with DM. The increase in MetS prevalence is driven by the obesity epidemic and anthropometric cut-off values to define MetS for this particular component of the disease has been reported to differ widely between different populations and ethnicities. Currently the waist circumference (WC) cut-off value for MetS diagnosis needs to be determined and validated per ethnic group as opposed to the previously used European derived cut-off values (Alberti et al., 2006; 2009). Validation of the WC cut-off value needs to be against one of the so called gold standards of central obesity measurement, such as Computer Tomography (CT). This technique can measure subcutaneous fat (SAT) and visceral fat (VAT) individually, which is important because VAT has been reported to be associated with MetS and CVD. The current study forms part of a large research group, investigating the prevalence and risk factors for MetS and T2DM in the South African mixed ancestry population.
Advisors/Committee Members: Matsha, T (advisor), Speelman, A (advisor).
Subjects/Keywords: Bioelectrical impedance analysis;
Obesity;
Computed tomography;
Metabolism – Disorders;
Anthropometry
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ismail, S. (2017). Anthropometric measurements versus computed tomography for the assessment of metabolic syndrome in the Bellville South mixed ancestry community, South Africa
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2691
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ismail, Saaiga. “Anthropometric measurements versus computed tomography for the assessment of metabolic syndrome in the Bellville South mixed ancestry community, South Africa
.” 2017. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2691.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ismail, Saaiga. “Anthropometric measurements versus computed tomography for the assessment of metabolic syndrome in the Bellville South mixed ancestry community, South Africa
.” 2017. Web. 27 Feb 2020.
Vancouver:
Ismail S. Anthropometric measurements versus computed tomography for the assessment of metabolic syndrome in the Bellville South mixed ancestry community, South Africa
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2017. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2691.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ismail S. Anthropometric measurements versus computed tomography for the assessment of metabolic syndrome in the Bellville South mixed ancestry community, South Africa
. [Thesis]. Cape Peninsula University of Technology; 2017. Available from: http://etd.cput.ac.za/handle/20.500.11838/2691
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
4.
Gota, Tatenda Innocent.
FTO supported Co3O4 thin film biosensor for detection of fructose
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2697
► Electrochemical and non-enzymatic fructose detection has evoked keen interest in the scientific literature. Several authors have reported on different methods of electrode preparation for fructose…
(more)
▼ Electrochemical and non-enzymatic fructose detection has evoked keen interest in the scientific literature. Several authors have reported on different methods of electrode preparation for fructose sensors. However, little systematic study has been conducted to design a cheap, efficient method of depositing metal oxides to detect fructose. To address the challenge, a Co3O4 thin film was fabricated using a simple solution step deposition on Fluorine doped Tin oxide (FTO) glass electrode.
In this study, a report on the selective oxidation of fructose on Co3O4 thin film electrode surface is presented. Electrode characterization was done using X-ray diffraction (XRD), High Resolution Transmission Electron Microscopy (HR-TEM), Scanning Electron Microscope (SEM), Atomic Fluorescence Microscopy (AFM), and Electrochemical Impedance Spectroscopy (EIS). All cyclic voltammetry (CVs) and chronoamperometry tests were carried out by the use of an AUTOLAB POTENTIOSTAT 302 N, controlled by Nova 2.0 software instrumentation using a customized 50 cm3 electrochemical cell. The cell consisted of a graphite rod as the counter electrode (CE), 3 M Ag/AgCl reference electrode (RE) and the fabricated Co3O4/FTO as the working electrode (WE). All experiments were carried out at 25±2 ⁰C.
From the results, the constructed sensor exhibited two distinctive linear ranges in the ranges of 0.021 – 1.74 mM and from 1.74 - ~15 mM, covering a wide linear range of up to ~15 mM at an applied potential of +0.6V vs. Ag/AgCl in 0.1M NaOH solution. The sensor demonstrated a high, reproducible and repeatable sensitivity of 495 (lower concentration range) & 53 (higher concentration range) μA cm-2 mM-1 for a low R.S.D of 5 %. The Co3O4 thin film produced a low detection limit of ~1.7 μM for a signal to noise ratio of 3 (S/N = 3); a fast response time of 6s and long term stability. The repeatability and stability of the electrode resulted from the chemical stability of Co3O4 thin film. The study showed that the sensor was highly selective towards fructose compared to the presence of other key interferences i.e. AA, AC, and UA. Because of such a favourable electrocatalysis of the Co3O4 sensor towards fructose, the ease of the electrode fabrication and reproducibility makes it a future candidate for commercial applications in the food and beverages sector.
Advisors/Committee Members: Chowdhury, Mahabubur (advisor), Ojumu, Tunde (advisor).
Subjects/Keywords: Electrochemical sensors;
Fructose – Detection;
Oxidation;
Metallic oxides
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APA ·
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CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gota, T. I. (2018). FTO supported Co3O4 thin film biosensor for detection of fructose
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2697
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gota, Tatenda Innocent. “FTO supported Co3O4 thin film biosensor for detection of fructose
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2697.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gota, Tatenda Innocent. “FTO supported Co3O4 thin film biosensor for detection of fructose
.” 2018. Web. 27 Feb 2020.
Vancouver:
Gota TI. FTO supported Co3O4 thin film biosensor for detection of fructose
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2697.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gota TI. FTO supported Co3O4 thin film biosensor for detection of fructose
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2697
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
5.
Gupta, Gunjan.
An analysis and improvement of selected features of power quality of grid-tied alternative energy systems
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2696
► Electrical energy can be easily used and converted to other forms of energy for various applications. Technological advancement increases the dependency on electricity to a…
(more)
▼ Electrical energy can be easily used and converted to other forms of energy for various applications. Technological advancement increases the dependency on electricity to a great extent. Various internal and external factors are responsible for the bad quality of power in power systems. The performance of the system is greatly affected by the presence of harmonics, as well as voltage and frequency variations, which leads to the malfunctioning of the device and decline of power quality and supply at load side. The reactive power compensation is carried out for better power quality.
The literature survey is done to find the best and efficient scheme for reactive power compensation and mitigation of various power quality problems. The devices which are used to measure various power quality factors are discussed. Various mitigating schemes are surveyed in order to compensate reactive power and to improve the power quality at the distribution end.
The integration of the most widely used renewable energy, wind energy in the distribution system creates technical issues like stability of the grid, harmonic distortion, voltage regulation, active and reactive power compensation etc. which are restricted to IEC and IEEE standards. One of the topics this thesis addresses is regulation in the reactive power generated along with voltage regulation by using an effective power electronics device known as a STATCOM. The main power quality factors like overvoltage and voltage flickers are mitigated by establishing STATCOMs in small wind farms. The wind farms are equipped with three wind turbines. These three wind turbines found in the wind farm can be operated together or one after another with an introduced delay.
A glitch in even a little piece of a power grid can result in loss of efficiency, income and at times even life. In this manner, it is basic to outline a system which can distinguish the faults of the power system and take a faster response to recover it back to required reactive power. Two devices STATCOM and D-STATCOM are used for this purpose in this thesis.
The D-STATCOM circuit and operating principle are also discussed in thesis. Different topologies of D-STATCOM discussed with their benefits and shortcomings. The voltage, current and hybrid technologies of D-STATCOM are also discussed.
Advisors/Committee Members: Fritz, Wilfred (advisor), Kahn, Mohamed Tariq (advisor).
Subjects/Keywords: Smart power grids;
Renewable energy sources;
Electric power distribution;
Energy development;
Electric power transmission – Reliability;
Electric power system stability
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APA ·
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CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gupta, G. (2018). An analysis and improvement of selected features of power quality of grid-tied alternative energy systems
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2696
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gupta, Gunjan. “An analysis and improvement of selected features of power quality of grid-tied alternative energy systems
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2696.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gupta, Gunjan. “An analysis and improvement of selected features of power quality of grid-tied alternative energy systems
.” 2018. Web. 27 Feb 2020.
Vancouver:
Gupta G. An analysis and improvement of selected features of power quality of grid-tied alternative energy systems
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2696.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gupta G. An analysis and improvement of selected features of power quality of grid-tied alternative energy systems
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2696
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
6.
Kasongo Wa Kasongo, Godwill.
Enhancement of membrane surface characteristics to improve membrane performance and durability in the treatment of municipal MBR effluent
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2695
► Fresh, clean water has always been critical for the world's social development. Supply of water can be reinforced through recycling and reuse; and secondary treatment…
(more)
▼ Fresh, clean water has always been critical for the world's social development. Supply of water can be reinforced through recycling and reuse; and secondary treatment of municipal wastewater effluent with a membrane bioreactor (MBR) followed by a reverse osmosis (RO) process, has emerged as a crucial treatment process for water reuse. However, fouling of RO membranes in such process is unavoidable. This leads to poor performance, increase in operational cost and degradation of the membrane material, which reduces the membrane life span. Various researches have been conducted to provide an understanding of the mechanism of fouling, and methods have been developed to minimize it. In this research, the effect of surface modification to minimise fouling on a thin film composite polyamide RO membrane was investigated. This study was divided into three parts, namely: membrane modification, biofouling and filtration using RO. Two modifying agents, PVA and DMAEMA, were used as grafting solutions. Escherichia coli (E. coli) were used as the biofoulant to study the ant-biofouling properties of the membranes. A make-up synthetic MBR secondary effluent feed was used in a bench scale RO process. During the membrane modification process, the membrane was treated using two different approaches. Firstly, the covalent attachment of polyvinyl alcohol (PVA) through Glutaraldehyde (GA) onto the surface and secondly the redox initiated grafting of dimethyl amino ethyl methacrylate (DMAEMA PVA and DMAEMA grafting solutions were applied at four different concentrations).
The PVA and DMAEMA modifying agents were successfully grafted onto the membrane top layers and were confirmed by the functional groups, present, using the Attenuated Total Reflectance–Fourier Transform Infrared spectroscopy (ATR-FTIR) spectra. The morphology of the membrane surfaces was investigated using Scanning Electron Microscopy (SEM), before and after treatment. SEM analysis showed better membrane structures with PVA grafting compared to DMAEMA.
Advisors/Committee Members: Aziz, M (advisor), Ojumu, TV (advisor).
Subjects/Keywords: Water – Purification – Reverse osmosis process;
Water treatment plants;
Water – Purification – Membrane filtration;
Sewage disposal
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❌
APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kasongo Wa Kasongo, G. (2018). Enhancement of membrane surface characteristics to improve membrane performance and durability in the treatment of municipal MBR effluent
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2695
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kasongo Wa Kasongo, Godwill. “Enhancement of membrane surface characteristics to improve membrane performance and durability in the treatment of municipal MBR effluent
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2695.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kasongo Wa Kasongo, Godwill. “Enhancement of membrane surface characteristics to improve membrane performance and durability in the treatment of municipal MBR effluent
.” 2018. Web. 27 Feb 2020.
Vancouver:
Kasongo Wa Kasongo G. Enhancement of membrane surface characteristics to improve membrane performance and durability in the treatment of municipal MBR effluent
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2695.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kasongo Wa Kasongo G. Enhancement of membrane surface characteristics to improve membrane performance and durability in the treatment of municipal MBR effluent
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2695
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
7.
Rossouw, Jean Pierre.
Factors affecting implementation of risk management systems at municipalities in the Overberg district, South Africa
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2698
► The aim of the study was to investigate the effectiveness of risk management systems within municipalities in the Overberg district of South Africa. The value…
(more)
▼ The aim of the study was to investigate the effectiveness of risk management systems within
municipalities in the Overberg district of South Africa. The value of effective risk management systems in any organisation cannot be underestimated as it is responsible for appropriately identifying, assessing, and treating risks that may adversely influence the achievement of organisational objectives. The Overberg district municipalities were used as case studies to identify and evaluate the factors that could affect implementation of risk management systems at a local government level in a specific geographical area. The primary research question was what factors affect the effective implementation of risk management systems at the Overberg district municipalities. To answer this research question, sub-questions and research objectives were formulated to determine the relevant factors. The research employed descriptive statistics, as well as inferential analysis to analyse the data. Lack of sufficient funding for risk mitigation seemed to be the main factor that affects the implementation of risk management systems within the municipalities. In addition, the research highlighted the current gaps in the implementation of risk management processes. This made municipalities aware of the risks within their organisation and identified the benefits of implementing sound risk management initiatives.
The contribution of the research will empower the Overberg district municipalities to manage their key organisational risks proactively. This will lead to sustainable local governments that will be able to continue to perform their primary functions effectively. From the results, it was evident that although the Overberg district municipalities had risk management systems in place, insufficient funding posed a challenge to effective risk mitigation. Municipal management should therefore allocate sufficient funding to ensure effective implementation of risk management systems.
Subjects/Keywords: risk management systems;
municipalities;
Overberg district;
South Africa;
organisational risks;
local governments
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rossouw, J. P. (2018). Factors affecting implementation of risk management systems at municipalities in the Overberg district, South Africa
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2698
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rossouw, Jean Pierre. “Factors affecting implementation of risk management systems at municipalities in the Overberg district, South Africa
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2698.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rossouw, Jean Pierre. “Factors affecting implementation of risk management systems at municipalities in the Overberg district, South Africa
.” 2018. Web. 27 Feb 2020.
Vancouver:
Rossouw JP. Factors affecting implementation of risk management systems at municipalities in the Overberg district, South Africa
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2698.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rossouw JP. Factors affecting implementation of risk management systems at municipalities in the Overberg district, South Africa
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2698
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
8.
Meyers, Luyanda Milard.
Analysis of lift and drag forces on the wing of the underwater glider
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2715
► Underwater glider wings are the lifting surfaces of unmanned underwater vehicles UUVs depending on the chosen aerofoil sections. The efficiency as well as the performance…
(more)
▼ Underwater glider wings are the lifting surfaces of unmanned underwater vehicles UUVs depending on the chosen aerofoil sections. The efficiency as well as the performance of an underwater glider mostly depends on the hydrodynamic characteristics such as lift, drag, lift to drag ratio, etc of the wings. Among other factors, the geometric properties of the glider wing are also crucial to underwater glider performance. This study presents an opportunity for the numerical investigation to improve the hydrodynamic performance by incorporating curvature at the trailing edge of a wing as oppose to the standard straight or sharp trailing edge. A CAD model with straight leading edge and trailing edge was prepared with NACA 0016 using SolidWorks 2017. The operating conditions were setup such that the inlet speed varies from 0.1 to 0.5 m/s representing a Reynolds number 27.8 x 10ᵌ and 53 x 10ᵌ.
The static pressure at different angles of attack (AOA) which varies from 2 to 16degrees at the increment of 2degrees for three turbulent models (K-Ԑ-standard, K-Ԑ-RNG and K-Ԑ-Realizable), was computed for upper and lower surfaces of the modified wing model using ANSYS Fluent 18.1. Thereafter the static pressure distribution, lift coefficient, drag coefficient, lift to drag ratio and pressure coefficient for both upper and lower surfaces were analysed. The findings showed that the lift and drag coefficient are influenced by the AOA and the inlet speed. If these parameters change the performance of the underwater glider changes as depicted by figure 5.6 and figure 5.7. The hydrodynamics of the underwater glider wing is optimized using the Cʟ/Cᴅ ratio as function of the operating conditions (AOA and the inlet speed). The investigation showed that the optimal design point of the AOA of 12 degrees and a corresponding inlet speed of 0.26m/s. The critical AOA matched with the optimal design point AOA of 12 degrees. It was also observed that Cp varies across the wing span. The results showed the Cp is higher closer to the fuselage while decreasing towards the mid-span and at the tip of the wing. This showed that the wing experiences more stress close to the fuselage than the rest of the wing span which implies that a higher structural rigidity is required close to the fuselage. The results of the drag and lift curves correspond to the wing characteristics typical observed for this type of aerofoil.
Subjects/Keywords: Underwater glider wings;
Underwater gliders;
Hydrodynamics;
Remote submersibles;
Underwater propulsion
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to Zotero / EndNote / Reference
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APA (6th Edition):
Meyers, L. M. (2018). Analysis of lift and drag forces on the wing of the underwater glider
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meyers, Luyanda Milard. “Analysis of lift and drag forces on the wing of the underwater glider
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meyers, Luyanda Milard. “Analysis of lift and drag forces on the wing of the underwater glider
.” 2018. Web. 27 Feb 2020.
Vancouver:
Meyers LM. Analysis of lift and drag forces on the wing of the underwater glider
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2715.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meyers LM. Analysis of lift and drag forces on the wing of the underwater glider
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2715
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
9.
Moyo, Louis Grandgrind.
Brand image legacy of the 2010 FIFA World Cupтм : a long-term assessment
.
Degree: 2018, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2717
► Sport mega-events are a powerful tool for branding nations. There has been a significant shift in countries that bid for and win the rights to…
(more)
▼ Sport mega-events are a powerful tool for branding nations. There has been a significant shift in countries that bid for and win the rights to host sport mega-events. Historically, Western countries used to be leaders in winning rights to host such events; however a new emerging trend has seen developing countries winning the rights ahead of developed ones, for example, South Africa, Brazil and Russia winning the rights to host the FIFA World CupTM. South Africa faced a serious branding challenge leading up to the 2010 FIFA World CupTM. Therefore, one of the primary objectives of hosting this tournament was to change international tourists’ perceptions of South Africa. There has been limited research on the brand legacies of the 2010 FIFA World CupTM, hence this research examined the brand image legacies of the tournament in the long run. It is believed that the football fans who attended the 2016 UEFA European Championship either visited South Africa during the 2010 FIFA World CupTM or watched the tournament on television (TV) at home, therefore they have certain perceptions of South Africa as a sport tourism destination. A quantitative methodology was employed to survey football tourists at fan parks and stadium precincts in five metropolitan cities in France during the 2016 UEFA European Championship, using a spatially based systematic sampling technique. In total 391 football tourist questionnaires were completed. The key findings reveal that prior to the 2010 FIFA World CupTM, football tourists’ perceptions of South Africa as a sport tourism destination were generally positive; however they indicated that they were very concerned about safety and security, as well as segregation issues, prior to the tournament. It can be argued that the tournament had a significant impact on reinforcing the positive perceptions of the destination as well as reducing the negative perceptions of the destination. The findings reveal statistically significant differences in most aspects between tourists’ perceptions prior to, and six years after, the 2010 FIFA World CupTM. Tourists’ perceptions on most aspects changed positively six years after the event, including those that were major concerns prior to the tournament. The findings also show that there has been very little repeat visitation to South Africa since South Africa hosted the 2010 FIFA Word CupTM. However, an overwhelming majority of respondents indicated that they were willing to travel to South Africa should it host another sport mega-event in the near future. The key findings of this study have a wider applicability to sport mega-events legacy research and body of knowledge. These key findings can assist destination marketers in managing the destination image and foster a greater understanding of brand image legacies of past mega-events in order to inform the bidding and hosting of future sport mega-events.
Subjects/Keywords: FIFA World Cup;
World Cup (Soccer);
Hosting of sporting events – South Africa;
Sports and tourism – South Africa;
City promotion – South Africa;
Place marketing – South Africa
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Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Moyo, L. G. (2018). Brand image legacy of the 2010 FIFA World Cupтм : a long-term assessment
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2717
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Moyo, Louis Grandgrind. “Brand image legacy of the 2010 FIFA World Cupтм : a long-term assessment
.” 2018. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2717.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moyo, Louis Grandgrind. “Brand image legacy of the 2010 FIFA World Cupтм : a long-term assessment
.” 2018. Web. 27 Feb 2020.
Vancouver:
Moyo LG. Brand image legacy of the 2010 FIFA World Cupтм : a long-term assessment
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2018. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2717.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moyo LG. Brand image legacy of the 2010 FIFA World Cupтм : a long-term assessment
. [Thesis]. Cape Peninsula University of Technology; 2018. Available from: http://etd.cput.ac.za/handle/20.500.11838/2717
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
10.
Hattingh, Christiaan.
A typology of gay leisure travellers : an African perspective
.
Degree: 2017, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/2718
► Over the last two decades, academic literature, various market research studies, and media reports have widely contributed to the belief that the Lesbian, Gay, Bisexual…
(more)
▼ Over the last two decades, academic literature, various market research studies, and media reports have widely contributed to the belief that the Lesbian, Gay, Bisexual and Transgender (LGBT) market, and more specifically the gay male sub-segment, display favourable characteristics for the tourism industry. As recently as 2017, gay travel was regarded as one of the fastest-growing markets in the international travel industry. It is thus clear that the importance of this market, whether accurate or not, has been well documented over the years and is well known by the tourism industry; however, despite an increasing trend where tourism destinations promote themselves as ‘gay friendly’ in an attempt to attract gay (homosexual) travellers, a segment of the LGBT travel market, these travellers are perceived to be a homogeneous market segment or a niche market as a result of the assumption that gay men and women lead similar lifestyles and because they are homosexual, indicating that sexual orientation is used as the principal distinguishing characteristic of this population. This assumption is problematic and rather simplistic as it conceals many other important variables, and may hinder effective destination marketing. In order to correctly harness the existing potential within this segment, there is a need to overcome the challenge of correctly understanding and adapting the tourism offering to the preferences and needs of gay travellers; hence this research aimed to develop a typology of gay leisure travellers, by segmenting gay travellers into homogeneous sub-segments in an attempt to contribute to the gap in literature regarding this market’s heterogeneity. A web-based electronic survey was completed by 506 gay travellers, and attribute-based benefit segmentation was carried out by applying a hierarchical cluster analysis using Ward’s procedure with Euclidean distances. The typology is based on the push and pull framework; the motivations of travellers were assessed both in terms of their socio-psychological motivations and destination attributes of Cape Town. A number of conclusions can be drawn from the suggested typology of gay leisure travellers. First, the typology suggests four unique gay travel sub-segments ranging from Passive Relaxers on the one end to Wildlife Explorers, Culinary Enthusiasts/Foodies and Gay-Centric Travellers on the extreme end, which empirically proves that gay travellers are not homogeneous as there are sub-segments of gay travellers with different consumer behaviours. Therefore, these sub-segments may be referred to as niches as individuals within these sub-groups are homogeneous in certain characteristics. Second, there are two sub-segments in which travellers’ behaviour is not influenced by their sexuality, while the sexuality of travellers in the two other sub-segments influences their travel behaviour to varying degrees. Third, there is evidence that the gay traveller is integrating with other larger mainstream market segments and that the literature on gay travel may soon find…
Subjects/Keywords: Gay travelers – Africa;
Gays – Travel – Africa;
Gay men – Travel – Africa;
Tourism – Africa
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hattingh, C. (2017). A typology of gay leisure travellers : an African perspective
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hattingh, Christiaan. “A typology of gay leisure travellers : an African perspective
.” 2017. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/2718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hattingh, Christiaan. “A typology of gay leisure travellers : an African perspective
.” 2017. Web. 27 Feb 2020.
Vancouver:
Hattingh C. A typology of gay leisure travellers : an African perspective
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2017. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/2718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hattingh C. A typology of gay leisure travellers : an African perspective
. [Thesis]. Cape Peninsula University of Technology; 2017. Available from: http://etd.cput.ac.za/handle/20.500.11838/2718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
11.
Giraneza, Martial.
High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1077
► The development of power electronics did remove most of technical limitations that high voltage direct current (HVDC) used to have. HVDC, now, is mostly used…
(more)
▼ The development of power electronics did remove most of technical limitations that high voltage direct current (HVDC) used to have. HVDC, now, is mostly used for the transmission of bulk power over long distances and for the interconnection of asynchronous grid. Along with the development of the HVDC, the growth of power demand also increased beyond the utilities capacities. Besides the on-going increasing of power demand, the reforms in electricity market have led to the liberalization and the incorporation of Independent power providers in power system operation. Regulations and rules have been established by regulating authority for grid integration of Independent power providers. With the expected increase of penetration level of those new independent power providers, result of economic reason and actual green energy trend, best method of integration of those new power plants are required.
In this research HVDC technology, namely VSC-HVDC is used as interface for connecting independent power providers units to the grid. VSC-HVDC has various advantages such as short-circuit contribution and independent control of active and reactive power. VSC-HVDC advantages are used for a safe integration of IPPs and make them participate to grid stabilization. MATLAB/Simulink simulations of different grid connected, through VSC-HVDC system, IPPs technologies models are performed.
For each IPP technology model, system model performances are studied and dynamics responses during the disturbance are analyzed in MATLAB/ Simulink program. The simulation results show that the model satisfy the standard imposed by the regulating authority in terms of power quality and grid support. Also the results show the effect of the VSC-HVDC in preventing faults propagation from grid to integrated IPPs units.
Subjects/Keywords: Electric power distribution;
High-tension electric transmission;
Direct-current transmission;
High voltages;
High voltage direct current (HVDC);
Voltage source converter (VSC);
VSC-HVDC;
Independent power providers (IPP);
Dissertations, Academic;
MTech
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Giraneza, M. (2013). High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1077
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Giraneza, Martial. “High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1077.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Giraneza, Martial. “High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
.” 2013. Web. 27 Feb 2020.
Vancouver:
Giraneza M. High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1077.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Giraneza M. High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1077
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
12.
Smith, Robert Albert.
A performance study of a voltage-fed reluctance synchronous machine
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1078
► The reluctance synchronous machine (RSM) operates on the principle of magnetic reluctance, which is produced through a careful selection of rotor flux barriers and cut-outs.…
(more)
▼ The reluctance synchronous machine (RSM) operates on the principle of magnetic reluctance, which is produced through a careful selection of rotor flux barriers and cut-outs. Magnetic reluctivity is the resistance to magnetic flux and can be directly related to the principles of Ohm’s law in electrical circuits. Although reluctance motors have been known for more than 150 years, researchers lost interest when Nikola Tesla’s induction machine (IM) was introduced to industry. Over the last few decades, however, RSMs have shown a lot of potential. They are cheap, robust, reliable, and their rotors can also be used in the stators of IMs. The disadvantage of these machines is an inherently high torque ripple, being the result of its rotor geometry, but the biggest advantage is having a significant reduction in copper losses after the rotor cage has been removed. This advantage drove engineers to investigate, optimise and modify the performance and structure of this machine, which led to the usage of electronic drive systems. The recent advances in technology have allowed researchers to further investigate and modify the design and performance of this special type of machine, with the integration of Finite Element Analysis (FEA) software also making a contribution to the development of the RSM’s current driven systems. The voltage-fed RSM, driven direct-on-line (DOL) from the utility supply, was left in the shadows as the current-fed RSM took reign, but still is, in the author’s opinion, not yet fully analysed. This thesis practically investigates the performance characteristics of the cageless, voltage-fed 3kW RSM in its steady-state operation, under various loads. These performance characteristics are also compared to a RSM driven from a sensorless vector drive (current-fed) to investigate the advantages and disadvantages between the two.
Experiments performed on the test bench immediately reveal a limitation to the voltage-fed RSM’s ability to drive higher loads. While the current-fed RSM conveniently reaches 150% of its full-load, the voltage-fed RSM, due to its cageless
structure, only reaches 110% of its full-load power. Despite this discovery, the voltage-fed RSM proves to have a lower core loss, harmonic content and torque ripple. Using a FE software package with an integrated source-code, additional parameters such as the dq-axis inductances and currents are also compared and analysed in terms of its reaction to an increase in load. The eddy-current, hysteresis and excess losses are also analysed as well as the harmonic components caused by the geometry of the RSM. For academic purposes, a fair amount of emphasis is placed on the approach to the problem. The preparation for the FE simulation is explained in detail, providing insight into the FE mathematical model as well as parameter acquisition. These parameters include current angle, friction and windage losses, stator resistance, end-winding leakage reactance, core loss and inertia. The results obtained by the FE model are compared to that of the measured…
Subjects/Keywords: Synchronous machinery;
Electric motors, synchronous;
Alternating-current machinery;
Reluctance motors;
Finite element analysis (FEA);
Direct-on-line (DOL);
MTech;
Theses, dissertations, etc.;
NavTech;
Cape Peninsula University of Technology. Department of Electrical Engineering
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smith, R. A. (2013). A performance study of a voltage-fed reluctance synchronous machine
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1078
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smith, Robert Albert. “A performance study of a voltage-fed reluctance synchronous machine
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1078.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Robert Albert. “A performance study of a voltage-fed reluctance synchronous machine
.” 2013. Web. 27 Feb 2020.
Vancouver:
Smith RA. A performance study of a voltage-fed reluctance synchronous machine
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1078.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith RA. A performance study of a voltage-fed reluctance synchronous machine
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1078
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
13.
Bevan, Graeme Rhys.
A practical investigation into the measurement of forces on the stator teeth of electrical machines
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1079
► Radial and peripheral displacement of stator teeth in electrical machines is known to be the cause of undesired vibration which leads to noise. This thesis…
(more)
▼ Radial and peripheral displacement of stator teeth in electrical machines is known to be
the cause of undesired vibration which leads to noise. This thesis serves to investigate the
possibility of physically measuring the radial displacement of stator teeth caused by
electromagnetic forces which, to the author’s knowledge, has not yet been achieved. A
simplified practical approach is adopted in order to address the inherent difficulties
attached to this problem, and the measurement of displacement is done by means of an
experimental rig where a tooth is subjected to magnetic force acting over an air gap.
Three experiments are carried out, each comprising ten tests, the results of which are
compared in order to gain some idea as to the magnitudes of displacement which can be
expected over a range of applied air gap flux densities. The aim of this work is to observe
the displacement response of magnetised EM core material when acted upon by forces,
and to see if the measured results agree with the elastic displacement predicted by a wellknown
formula. It will be shown that although the measured results are in the same range
as the predicted results, there is a deviation from the predicted linearity due to certain
characteristics of the force rig, which are explained.
The chosen measurement method is capacitive displacement and is shown to be a viable
alternative to the more commonly used search coils and vibrometers in past literatures,
especially when measuring displacements on the nano-scale. In addition, this study shows
the importance of using 3D finite element software to simulate the electromagnetic model
when saturation is present in the core of the test specimen. The important findings of this
work are discussed in detail, and some ideas put forward, in an attempt to establish a
starting point for future related work in the measurement of electromagnetic forceinduced
displacement of stator teeth in electrical machines.
Subjects/Keywords: Electric machines;
Electrical machines;
Electromagnetic compatibility;
Electromagnetic theory;
Stator teeth;
Electromagnetic model;
3D finite element software;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.;
NavTech;
Cape Peninsula University of Technology. Department of Electrical Engineering
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bevan, G. R. (2013). A practical investigation into the measurement of forces on the stator teeth of electrical machines
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bevan, Graeme Rhys. “A practical investigation into the measurement of forces on the stator teeth of electrical machines
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bevan, Graeme Rhys. “A practical investigation into the measurement of forces on the stator teeth of electrical machines
.” 2013. Web. 27 Feb 2020.
Vancouver:
Bevan GR. A practical investigation into the measurement of forces on the stator teeth of electrical machines
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bevan GR. A practical investigation into the measurement of forces on the stator teeth of electrical machines
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
14.
Pentz, Rory Adriaan.
Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
.
Degree: 2014, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1080
► This report presents the design and development of a five cell multicell inverter for driving a piezoelectric load. The multicell inverter was chosen for this…
(more)
▼ This report presents the design and development of a five cell multicell inverter for driving a piezoelectric load. The multicell inverter was chosen for this application as it became evident that it would be more suitable for driving piezoelectric transducers due to its high apparent switching frequency. The multicell inverter was designed using DirectFET’s as this type of FET has a high current switching ability in a very small package. A positive and negative bootstrap power supply was incorporated in the design to reduce the number of supplies to power the gate drive circuits of the multicell inverter.
Three compensation networks were designed and constructed to investigate which one would transfer the most energy to the piezoelectric transducer. It was also important to investigate whether these compensation networks were able to reduce the harmonic content produced by the multicell inverter. This is necessary in order to excite the transducer correctly. It was found that the Q-Matching compensation network reduced the harmonic content applied to the load the most. Experiments were also conducted to determine if the advantage of the apparent frequency of the multicell inverter would mean that the piezoelectric load could be driven directly with the multicell inverter without any damage to the transducer. It was however required to increase the applied apparent power to the transducer to compensate for the reactive component of the load in order to melt the plastic which was used as the load to the transducer.
Experiments were conducted to determine if the charge on the cell capacitors of the multicell inverter would stay balanced while driving a non linear load such as a piezoelectric transducer. The results showed that the voltages stayed balanced when driving the piezoelectric transducer.
Subjects/Keywords: Electric inverters;
Piezoelectric transducers;
Topology;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.;
Cape Peninsula University of Technology. Department of Electrical Engineering
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Pentz, R. A. (2014). Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pentz, Rory Adriaan. “Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
.” 2014. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pentz, Rory Adriaan. “Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
.” 2014. Web. 27 Feb 2020.
Vancouver:
Pentz RA. Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2014. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pentz RA. Development of a multi-cell inverter topology for driving nonlinear piezoelectric load
. [Thesis]. Cape Peninsula University of Technology; 2014. Available from: http://etd.cput.ac.za/handle/20.500.11838/1080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
15.
Cupido, Stephen William John.
Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1084
► The CubeSat standard has various engineering challenges due to its small size and surface area. The challenge is to incorporate a large amount of technology…
(more)
▼ The CubeSat standard has various engineering challenges due to its small size and surface area. The challenge is to incorporate a large amount of technology into a form factor no bigger than 10cm3. This research project investigates the space environment, solar cells, secondary sources of power, and Field-Programmable-Gate-Array (FPGA) technology in order to address the size, weight and power challenges presented by the CubeSat standard. As FPGAs have not yet been utilised in this particular sub-system as the main controller, this research investigates whether or not the implementation of an FPGA-based electronic power supply sub-system will optimise its functionality by overcoming these size weight and power challenges.
The SmartFusion FPGA was chosen due to its analogue front end which can reduce the number of peripheral components required by such complex systems. Various maximum power point tracking algorithms were studied and it was determined that the perturb-and-observe maximum power point tracking algorithm best suits the design constraints, as it only requires the measurement of either solar cell voltage or solar cell current, thus further decreasing the component count. The SmartFusion FPGA analogue compute engine allows for increased performance of the perturb-and-observe algorithm implemented on the microcontroller sub-system as it allows for the offloading of many repetitive calculations. A VHDL implementation of the pulse-width-modulator was developed in order to produce the various changes in duty cycle produced by the perturb-and-observe algorithm.
The aim of this research project was achieved through the development and testing of a nano-satellite power system prototype using the SmartFusion FPGA from Microsemi with a decreased number of peripheral circuits. Maximum power point was achieved in 347ms at worst case with a 55% decrease in power consumption from the estimated 330mW as indicated in the power budget. The SmartFusion FPGA consumes only a worst case of 148.93mW. It was found that the unique features of the SmartFusion FPGA do in fact address the size weight and power constraints of the CubeSat standard within this sub-system.
Subjects/Keywords: Nanosatellites;
Electric power systems;
Field programmable gate arrays;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
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Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Cupido, S. W. J. (2013). Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
(Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1084
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cupido, Stephen William John. “Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1084.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cupido, Stephen William John. “Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
” 2013. Web. 27 Feb 2020.
Vancouver:
Cupido SWJ. Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
[Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1084.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cupido SWJ. Augmentation of a nano-satellite electronic power system using a field-programmable-gate-array.
[Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1084
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
16.
Nzeugaing, Gutembert Nganpet.
Image compression system for a 3u cubesat
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1085
► Earth observation satellites utilise sensors or cameras to capture data or images that are relayed to the ground station(s). The ZACUBE-02 CubeSat currently in development…
(more)
▼ Earth observation satellites utilise sensors or cameras to capture data or images that are relayed to the ground station(s). The ZACUBE-02 CubeSat currently in development at the French South African Institute of Technology (F’SATI) contains a high resolution 5 megapixel on-board camera. The purpose of the camera is to capture images of Earth and relay them to the ground station once communication is established. The captured images, which can amount to a large volume of data, have to be stored on-board as the CubeSat awaits the next cycle of transmission to the ground station. This mode of operation introduces a number of problems, as the CubeSat has limited storage and memory capacity and is not able to store large amounts of data. This, together with the limitation of the downlink capacity, has set the need for the design and development of an image compression system suitable for the CubeSat environment.
Image compression focuses on reducing the size of images to be stored as well as reducing the size of the images to be transmitted to the ground station. The purpose of the study is to propose a compression system to be implemented on ZACUBE-02. An intensive study of current, proposed and implemented compression methods, algorithms and techniques as well as the CubeSat specification, served as input for defining the requirements for such a system.
The proposed design is a combination of image segmentation, image linearization and image entropy coding (run-length coding). This combination technique is implemented in order to achieve lossless image compression. For the proposed design, a compression ratio of 10:1 was obtained without negatively affecting image quality.The on-board storage memory constraints, the power constraints and the bandwidth constraints are met with the implementation of the proposed design, resulting in the downlink transmission time being minimised.
Within the study a number of objectives were met in order to design, implement and test the compression system. These included a detailed study of image compression techniques; a look into techniques for improving the compression ratio; and a study of industrial hardware components suitable for the space environment.
Keywords: CubeSat, hardware, compression, satellite image compression, Gumstix Overo Water, ZACUBE-02.
Subjects/Keywords: CubeSat power systems;
Image compression;
Data compression (Telecommunication);
Satellites;
Dissertations, Academic;
ZACUBE-02;
Gumstix overo water;
MTech;
Theses, dissertations, etc.
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Nzeugaing, G. N. (2013). Image compression system for a 3u cubesat
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1085
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nzeugaing, Gutembert Nganpet. “Image compression system for a 3u cubesat
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1085.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nzeugaing, Gutembert Nganpet. “Image compression system for a 3u cubesat
.” 2013. Web. 27 Feb 2020.
Vancouver:
Nzeugaing GN. Image compression system for a 3u cubesat
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1085.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nzeugaing GN. Image compression system for a 3u cubesat
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1085
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
17.
Meru, Alan Henry Micheni.
Design and development of medium voltage open rack harmonic filters for distribution networks
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1087
► Harmonic voltages and currents in distribution networks are on the increase in recent times due to the introduction of a proliferation of electronic controlled devices…
(more)
▼ Harmonic voltages and currents in distribution networks are on the increase in recent times
due to the introduction of a proliferation of electronic controlled devices such as variable
speed drives. These non-linear devices improve efficiency but distort the supply waveforms.
To address the harmonic issues, harmonic filters are used to mitigate distortion levels and
prevent damage. These harmonic filters are commonly found at medium voltage levels in
power systems. The problem is that knowledge from the design to commissioning stages of
these medium voltage harmonic filters are neither well developed nor adequately
documented. The aim of this research is to investigate and expound upon the process whilst
taking into account all the factors involved throughout the process from bringing such a filter
into operation in the real world.
Medium voltage harmonic filters are usually the open rack type found in outdoor installations.
Capacitors and reactors are the main components used in the construction of such harmonic
filters and in some instances resistors are also used. The physical size and spacing of such
components determines the construction layout area and how this is done in practice
warrants being researched and explained in this thesis.
In order to make these factors explicit, a methodology is developed from design, to
installation and commissioning and is applied to two networks which are used to prove that
the developed methodology is applicable for the different types of harmonic filters designed.
The network voltage levels are also different, thus implying that the components will have
different design factors. The final arrangements of the harmonic filters are later drawn and
shown in three-dimension (3D) as per dimensions. The 3D figures are a further contribution
as the design is taken from theory and is ultimately implemented into an installation and
construction layout for erection at site.
Interviews and surveys are conducted with specialists in industry dealing with harmonic filter
applications and the results are analysed as part of implementation of the developed
methodology.
The design, installation and construction phases are documented and shown to be effective
in application and the work disclosed in this thesis will help newcomers to this specialised
field and is recommended for use in industry.
Subjects/Keywords: Harmonics (Electric waves);
Electric power distribution;
Dissertations, Academic;
MTech
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APA (6th Edition):
Meru, A. H. M. (2013). Design and development of medium voltage open rack harmonic filters for distribution networks
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Meru, Alan Henry Micheni. “Design and development of medium voltage open rack harmonic filters for distribution networks
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Meru, Alan Henry Micheni. “Design and development of medium voltage open rack harmonic filters for distribution networks
.” 2013. Web. 27 Feb 2020.
Vancouver:
Meru AHM. Design and development of medium voltage open rack harmonic filters for distribution networks
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Meru AHM. Design and development of medium voltage open rack harmonic filters for distribution networks
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
18.
Nteka, Makhetsi Flora.
Development and assessment of reduced order power system models
.
Degree: 2013, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1088
► The demand for electrical energy has kept on increasing, thus causing power systems to be more complex and bringing the challenging problems of electrical energy…
(more)
▼ The demand for electrical energy has kept on increasing, thus causing power systems to be more complex and bringing the challenging problems of electrical energy generation, transmission, stability, as well as storage to be examined more thoroughly.
With the advent of high-speed computation and the desire to analyze increasingly complex behaviour in power systems, simulation techniques are gaining importance and prevalence. Nevertheless, while simulations of large, interconnected complex power systems are feasible, they remain time-consuming. Moreover, the models and parameters used in simulations are uncertain, due to measurement uncertainty, the need to represent a complex behaviour with low-order models, and the inherent changing nature of the power system.
This research explores the use of a model reduction technique and the applications of a Real-Time Digital Simulator (RTDS) to reduce the uncertainty in large-scale complex power system models. The main goal of the research is to develop a reduced order model and to investigate the applications of the RTDS simulator in reduction of large, interconnected power systems models. The first stage of the study is to build and simulate the full model of the power system using the DigSILENT and RTDS simulators. The second phase is to apply model reduction technique to the full model and to determine the parameters in the reduced-order model as well as how the process of reduction increases this model uncertainty. In the third phase the results of the model reduction technique are compared based on the results of the original model - IEEE standard benchmark models has been used. The RTDS was used for comparative purposes.
The thesis investigations use a particular model reduction technique as Coherency based Method. Though the method ideas are applicable more generally, a concrete demonstration of its principles is instructive and necessary. Further, while this particular technique is not relevant to every system, it does apply to a broad class of systems and illustrates the salient features of the proposed methodology.
The results of the thesis can be used in the development of reduced models of complex power systems, simulation in real-time during power system operation, education at universities, and research.
Keywords: IEEE benchmark models, reduced models, Coherency based Method, DigSILENT, RTDS, model uncertainty, power system stability
Subjects/Keywords: Electric power system stability;
Electric pow systems;
Real time digital stimulator;
Electric power transmission;
Dissertations, Academic;
MTech;
Theses, dissertations, etc.
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nteka, M. F. (2013). Development and assessment of reduced order power system models
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1088
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nteka, Makhetsi Flora. “Development and assessment of reduced order power system models
.” 2013. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1088.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nteka, Makhetsi Flora. “Development and assessment of reduced order power system models
.” 2013. Web. 27 Feb 2020.
Vancouver:
Nteka MF. Development and assessment of reduced order power system models
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2013. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1088.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nteka MF. Development and assessment of reduced order power system models
. [Thesis]. Cape Peninsula University of Technology; 2013. Available from: http://etd.cput.ac.za/handle/20.500.11838/1088
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
19.
Raji, Atanda Kamoru.
Modelling and development of fuel cell off grid power converter system
.
Degree: 2008, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1090
► Fuel cell technology is an emerging technology that provides a highly efficient, quiet operation, reliable, and environmentally friendly energy conversion system for stationary, automobile (vehicle),…
(more)
▼ Fuel cell technology is an emerging technology that provides a highly efficient, quiet
operation, reliable, and environmentally friendly energy conversion system for stationary,
automobile (vehicle), and portable applications. An electrochemical process combines
hydrogen fuel and oxygen from air to produce water, and in the process it produces
electricity and heat. Fuel cell stationary applications which include residential, office
buildings, hospitals, hotels, airports and others have received greater attention for their
ability to utilize the heat generated for space and water heating. This combined heat and
power (CHP) process increases the energy conversion efficiency greatly which in turn
save cost of energy usage.
Different power converter topologies for fuel cell systems residential applications are
presented in this thesis for efficiency, cost, component count, input ripple current
minimization technique, reliability for comparison analysis. The commercial feasibility of
fuel cells rests on the cost of the fuel cell system and operating efficiency and fuel cost.
The proposed power converter topology consists of two front end DC-DC converters.
The first front-end DC-Dc converter is tightly controlled while the second is a full bridge
four interleaved DC-DC converters. Advantages of the proposed topology are reduced
input ripple current, high efficiency, low maintenance cost, smaller size, modularity,
redundancy. Design overview as well as simulation results are presented.
Fuel cell simulation test results, including transient response are displayed and
analyzed. The concept of interleaving of multiple units of the De-De converter is
proposed. Interleaving enables paralleling multiple units of the converters to achieve a
high combined power. This results in using semiconductor power devices of lower
current rating, lowering sizes of input and output capacitors and reducing the output
ripples. Simulations results are presented that verify the concept of interleaving.
Preliminary work to implement interleaving is presented, and future work is
recommended.
Subjects/Keywords: Fuel cells;
Electric power systems;
Direct energy conversion;
Energy conservation
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Raji, A. K. (2008). Modelling and development of fuel cell off grid power converter system
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1090
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Raji, Atanda Kamoru. “Modelling and development of fuel cell off grid power converter system
.” 2008. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1090.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Raji, Atanda Kamoru. “Modelling and development of fuel cell off grid power converter system
.” 2008. Web. 27 Feb 2020.
Vancouver:
Raji AK. Modelling and development of fuel cell off grid power converter system
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2008. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1090.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Raji AK. Modelling and development of fuel cell off grid power converter system
. [Thesis]. Cape Peninsula University of Technology; 2008. Available from: http://etd.cput.ac.za/handle/20.500.11838/1090
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
20.
Ayeleso, Ayokunle Oluwaseun.
An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
.
Degree: 2014, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1091
► In the Earth’s upper atmosphere, damage to spacecraft electronics is caused by the exposure to extreme ultraviolet (EUV) radiation, solar protons and cosmic rays emanating…
(more)
▼ In the Earth’s upper atmosphere, damage to spacecraft electronics is caused by the exposure to extreme ultraviolet (EUV) radiation, solar protons and cosmic rays emanating from the Sun. One particular region where these types of radiation occur is the South Atlantic Magnetic Anomaly (SAMA) region. Therefore, there is a need to design sensors which could be used to investigate the flux and energy levels of radiation in this region. In order to do so, the present study focuses on the numerical simulations of plasma (atomic oxygen ion) in the ionosphere’s F-layer region using the principle of Langmuir single probe theory. Another goal of this study is to investigate the behaviour of a copper plate sensor under exposure to ultraviolet (UV) radiation through simulation and experimentation in a laboratory setting in terms of the photoelectric effect principle.
Simulation results of the plasma model of the ionosphere’s F-layer region using an ideal single spherical probe showed that ionospheric plasma parameters such as electron temperature and electron density can be determined using the I−V characteristic curve obtained from the probe. Similarly, the simulation results of the behaviour of the copper plate under exposure to UV radiation showed that UV light with wavelengths shorter than 237 nm produced photocurrents. After calculations and simulations, the stopping potentials that could decelerate electrons emitted with UV radiation wavelengths between 100 nm and 237 nm are, respectively, between -7.6 V and -0.2 V. When comparing the calculated copper stopping potentials with the simulated copper stopping potentials, the results converge for shorter wavelengths. These short wavelengths are relevant in this study because they are comparable to EUV wavelengths (10 nm to 121 nm) in the SAMA region. Therefore, the stopping potential results were used in the experimental design and VUV radiation testing of the sensor prototypes.
Two different copper sensor prototypes, namely a spherical extreme ultraviolet and plasma spectrometer (SEPS) sensor and a planar sensor were designed and constructed for the realisation of this project. The planar sensor, with dimensions that fit on the sides of a one unit (1U) CubeSat was developed to minimise the experimental uncertainty observed with the SEPS sensor. The aim of this study is to characterise the sensors and their responses to typical plasma and EUV radiation levels using the facilities available in the Western Cape region (South Africa). Plasma testing was not investigated due to lack of test facilities. Therefore, the investigation into plasma measurements was simulation-based. Experimental EUV radiation testing was conducted. Extreme ultraviolet radiation measurements were performed with different vacuum ultraviolet (VUV) sources, namely a pulsed laser and a deuterium lamp (steady) radiation. These measurements posed challenges due to the significant ambient noise present in the laboratory. Consequently, the study looked at both
time and frequency domain analyses as avenues to…
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APA ·
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Export
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Manager
APA (6th Edition):
Ayeleso, A. O. (2014). An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1091
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ayeleso, Ayokunle Oluwaseun. “An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
.” 2014. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1091.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ayeleso, Ayokunle Oluwaseun. “An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
.” 2014. Web. 27 Feb 2020.
Vancouver:
Ayeleso AO. An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2014. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1091.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ayeleso AO. An extreme ultraviolet and plasma spectrometer scientific payload for a cubesat
. [Thesis]. Cape Peninsula University of Technology; 2014. Available from: http://etd.cput.ac.za/handle/20.500.11838/1091
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
21.
Davies, Edward.
Development of a hand-held multicell inverter-based ultrasonic plastic welder
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1093
► This thesis presents the design and development of a multicell inverter for ultrasonic plastic welding applications and other ultrasonic applications. An overview of the main…
(more)
▼ This thesis presents the design and development of a multicell inverter for ultrasonic plastic
welding applications and other ultrasonic applications. An overview of the main multilevel
topologies is given, but this research focuses on the multicelll inverter, because of its
capacitor voltage balancing properties.
Loading effects of various plastic materials to an ultrasonic plastic welding tool are provided
in this thesis. A simple method to create an approximate electrical equivalent circuit of the
ultrasonic welding tool, using an impedance analyser, loaded with different plastics is
discussed and illustrated.
Experimental results of the four-level multicell inverter driving a resistive load and an
ultrasonic transducer tool are presented in this thesis. These results provide proof that the
multicell inverter topology is capable of driving a non-linear load.
The inverter was tested with the ultrasonic load as an ultrasonic plastic welder and an
ultrasonic drill. The welding joints on the plastic samples are also evaluated in order to
evaluate whether or not this solution is suitable for plastic welding. The ultrasonic drilling
results are also shown in this thesis.
It is further illustrated that the ultrasonic tool and power supply combination may be used in
other ultrasonic applications.
Subjects/Keywords: Plastics – Welding;
Ultrasonic welding
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Davies, E. (2009). Development of a hand-held multicell inverter-based ultrasonic plastic welder
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Davies, Edward. “Development of a hand-held multicell inverter-based ultrasonic plastic welder
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Davies, Edward. “Development of a hand-held multicell inverter-based ultrasonic plastic welder
.” 2009. Web. 27 Feb 2020.
Vancouver:
Davies E. Development of a hand-held multicell inverter-based ultrasonic plastic welder
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Davies E. Development of a hand-held multicell inverter-based ultrasonic plastic welder
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
22.
Catherine, Quinton Shaun.
Effective geyser management through intelligent hot water usage profiling
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1094
► This study presents an intelligent Hot Water Cylinder (HWC) usage profiling system to provide peak demand side management and improve HWC efficiency in a typical…
(more)
▼ This study presents an intelligent Hot Water Cylinder (HWC) usage profiling system to
provide peak demand side management and improve HWC efficiency in a typical
household. In this research HWCs will be referred to as geysers.
Research was done into various techniques available to improve energy efficiency in
South Africa, as well as the different sectors South Africa's electricity supplier, Eskom,
has highlighted where improvements in energy efficiency can be made. From this it was
decided to refine the scope of the project to the residential sector, and more importantly
geyser. A typical geysers operation and power consumption was researched and analysed
to determine where efficiency improvements could be made. A system was required that
would reduce the amount of energy consumed by the geyser, and provide the consumer
with hot water at the same time. Based on the research it was decided to design a profile
based geyser controller. The profiling system comprised of a PIC microcontroller, four
digital temperature sensors and a time keeper used to determine individually based hot
water usage profiles for the home. The profile was based on three parameters, namely the
frequency (repetitiveness) of hot water being drawn, the length of the draw period, and
the time of day when the water was drawn. Once the profile had reached a 90% accuracy,
the profile implemented itself. Based on the profile, the controller then regulated the
temperature of the geyser according to the demand of the household, without manual
intervention. If the household's routine were changed, the profile would adapt itself
accordingly. The controller is therefore fully intelligent and continues to refine the profile
on a day to day basis. By introducing the profile based controller, the monthly average
geyser temperature was reduced, reducing the amount of standing losses, which in torn
reduced the total amount of energy consumed by the geyser. The profile controller was
designed to aid in the reduction of the energy demand of geysers on the power grid. This
will benefit both the consumer as well as Eskom, as Eskom will have a reduced power
load, and the consumer will have a reduced electricity bill. The results of the experiments
are shown, as well as a comparison between calculated versus measured results, to justify
the accuracy of the calculations.
Subjects/Keywords: Hot-water supply;
Water heaters;
Geysers
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APA (6th Edition):
Catherine, Q. S. (2009). Effective geyser management through intelligent hot water usage profiling
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1094
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Catherine, Quinton Shaun. “Effective geyser management through intelligent hot water usage profiling
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1094.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Catherine, Quinton Shaun. “Effective geyser management through intelligent hot water usage profiling
.” 2009. Web. 27 Feb 2020.
Vancouver:
Catherine QS. Effective geyser management through intelligent hot water usage profiling
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1094.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Catherine QS. Effective geyser management through intelligent hot water usage profiling
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1094
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
23.
Muga, Julius N'gon'ga.
Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1097
► In real world systems such as the waste water treatment plants, the nonlinearities, uncertainty and complexity playa major role in their daily operations. Effective control…
(more)
▼ In real world systems such as the waste water treatment plants, the nonlinearities,
uncertainty and complexity playa major role in their daily operations. Effective control of such
systems variables requires robust control methods to accommodate the uncertainties and
harsh environments. It has been shown that intelligent control systems have the ability to
accommodate the system uncertain parameters. Techniques such as fuzzy logic, neural
networks and genetic algorithms have had many successes in the field of control because
they contain essential characteristics needed for the design of identifiers and controllers for
complex systems where nonlinearities, complexity and uncertainties exist.
Approaches based on neural networks have proven to be powerful tools for solvinq nonlinear
control and optimisation problems. This is because neural networks have the ability to learn
and approximate nonlinear functions arbitrarily wei!. The approximation capabilities of such
networks can be used for the design of both identifiers and controllers. Basically, an artificial
neural network is a computing architecture that consists of massively parallel
interconnections of simple computing elements that provide insights into the kind of highly
parallel computation that is carried out by biological nervous system. A large number of
networks have been proposed and investigated with various topological structures.
functionality and training algorithms for the purposes of identification and control of practical
systems.
For the purpose of this research thesis an approach for the investigation of the use of neural
networks in identification, modelling and control of non-linear systems has been carried out.
In particular, neural network identifiers and controllers have been designed for the control of
the dissolved oxygen (DO) concentration of the activated sludge process in waste water
treatment plants. These plants, being complex processes With several variables (states) and
also affected by disturbances require some form of control in order to maintain the standards
of effluent. DO concentration control in the aeration tank is the most widely used controlled
variable. Nonlinearity is a feature that describes the dynamics of the dissolved oxygen
process and therefore the DO estimation and control may not be sufficiently achieved with a
conventional linear controller.
Neural networks structures are proposed, trained and utilized for purposes of identification.
modelling and design of NN controllers for nonlinear DO control. Algorithms and programs
are developed using Matlab environment and are deployed on a hardware PLC platform. The
research is limited to the feedforward multilayer perceptron and the recurrent neural
networks for the identification and control. Control models considered are the direct inverse mode! control, internal mode! contra! and feedback linearizing control. Real-time
implementation is limited to the lab-scale wastewater treatment plant.
Subjects/Keywords: Neural networks (Computer science);
Nonlinear systems;
Artificial intelligence
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Muga, J. N. (2009). Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1097
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Muga, Julius N'gon'ga. “Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1097.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Muga, Julius N'gon'ga. “Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
.” 2009. Web. 27 Feb 2020.
Vancouver:
Muga JN. Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1097.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Muga JN. Investigation of artificial neural networks for modeling, identification and control of nonlinear plant
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1097
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
24.
Kujane, Koketso Portia.
Investigation and development of methods for optimal control of the activated sludge process
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1099
► This project was started as a result of strict environmental and health regulations together with a demand tor cost effective operation of wastewater treatment plants…
(more)
▼ This project was started as a result of strict environmental and health regulations together
with a demand tor cost effective operation of wastewater treatment plants (VVWTPs). The
main aim of this project is how to keep effluent concentration below a prescribed limit at the
lowest possible cost. Due to large fluctuations in the quality and quantity of the influent
concentrations, traditional control methods are not adequate to achieve this aim The major
drawback with these methods is that the disturbances affect the process before the controller
has time to correct the error (Olsson and Newell, 1999: 454). This problem is addressed
through the use of modern control systems.
Modern control systems are model based predictive algorithms arranged as feed-forward
controllers (Olsson and Newell. 1999: 454). Normally a controller is equipped with a constant
set point; the goal In this project is to calculate an optimal DO trajectory that may be sampled
to provide a varying optimal set-point for the Activated Sludge Process, In this project an
optimal control problem Is formulated using DO concentration as a control variable. This
requires a model of the process to be controlled a mathematical expressions of the
limitations on the process input and output variables and finally the objective functional. which
consists of the objectives of the control.
The structures of the Benchmark plant (developed within the COST 682 working group) and
the Athlone WWTPs are used to implement this opt.mat control strategy in MATLAB. The
plant's full models are developed based on the mass balance principle incorporating the
activated sludge biological models: ,ASM1, ASM2, ASM2d and ASM3 (developed by the IWA
working groups). To be able to develop a method that may later on be used for online
control, the full models are reduced based on the technique In Lukasse (1996). To ensure
that the reduced models keep the same prediction capabilities as the full models, parameters
of the reduced models are calculated based on the Least Squares principle, The formulated
optimal control problem is solved based on the decompostion-coorcdination method that
involves time decomposition in a two layer structure.
MATLAB software [5 developed to solve the problems for parameter estimation. fun and
reduced mode! simulation. and optimal control calculation for the considered different cases
of plant structures and biological models. The obtained optimal 00 trajectories produced the
effluent state trajectories within prescribed requirements. These DO trajectories may be
implemented in different SCADA systems to be tracked as set points or desired trajectories
by different types of controllers.
Subjects/Keywords: Sewage;
Wastewater treatment;
Control theory;
Automatic control
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kujane, K. P. (2009). Investigation and development of methods for optimal control of the activated sludge process
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1099
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kujane, Koketso Portia. “Investigation and development of methods for optimal control of the activated sludge process
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1099.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kujane, Koketso Portia. “Investigation and development of methods for optimal control of the activated sludge process
.” 2009. Web. 27 Feb 2020.
Vancouver:
Kujane KP. Investigation and development of methods for optimal control of the activated sludge process
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1099.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kujane KP. Investigation and development of methods for optimal control of the activated sludge process
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1099
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
25.
Davids, Vernon Pete.
Implementation of a wideband microstrip phased array antenna for X-band radar applications
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1100
► This thesis presents the design, analysis and implementation of an eight-element phased array antenna for wideband X-band applications. The microstrip phased array antenna is designed…
(more)
▼ This thesis presents the design, analysis and implementation of an eight-element phased array
antenna for wideband X-band applications. The microstrip phased array antenna is designed
using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid
6010LM substrate made by Rogers Corporation. The feeding network entails a uniform
beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming
network, each with and without 45° delay lines, generating a squinted beam 14° from
boresight. Antenna parameters such as gain, radiation patterns and impedance bandwidth
(BW) are investigated in the single element as well as the array environment. Mutual coupling
between the elements in the array is also predicted.
The quasi-Yagi radiator employed as radiating element in the array measured an exceptional
impedance bandwidth (BW) of 50% for a S11 < -10 dB from 6 GHz to 14 GHz, with 3 dB to
5 dB of absolute gain in the frequency range from 8 GHz to 11.5 GHz. The uniform broadside
array measured an impedance BW of 20% over the frequency band and a gain between 9 dB
to 11 dB, whereas the non-uniform broadside array measured a gain of 9 dB to 11 dB and an
impedance BW of 14.5%. Radiation patterns are stable across the X-band. Beam scanning is
illustrated in the E-plane for the uniform array as well as for the non-uniform array.
Subjects/Keywords: Radar – Antennas;
Antennas (Electronics);
Antenna arrays;
Strip transmission lines
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Davids, V. P. (2009). Implementation of a wideband microstrip phased array antenna for X-band radar applications
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1100
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Davids, Vernon Pete. “Implementation of a wideband microstrip phased array antenna for X-band radar applications
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1100.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Davids, Vernon Pete. “Implementation of a wideband microstrip phased array antenna for X-band radar applications
.” 2009. Web. 27 Feb 2020.
Vancouver:
Davids VP. Implementation of a wideband microstrip phased array antenna for X-band radar applications
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1100.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Davids VP. Implementation of a wideband microstrip phased array antenna for X-band radar applications
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1100
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
26.
Smith, Johan.
High voltage direct current strategy solving power delivery shortages to localized area of national grid
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1102
► The industrial and population growth of a nation can cause power delivery problems to localized areas of a national grid through their increased demand for…
(more)
▼ The industrial and population growth of a nation can cause power delivery problems to
localized areas of a national grid through their increased demand for electrical energy. One
reason for these power shortages is the insufficient current carrying capacity of existing high
voltage alternating current, (HVAC), transmission lines supplying the area. High voltage
direct current (HVDC) transmission lines are a possible solution as they provide better power
delivery than HVAC lines.
New or upgraded HVAC lines, or HVDC lines or combinations of HVAC and HVDC lines are
possible solutions to improve power delivery. This research investigates the various line
possibilities using theory. and cutting edge frequency and time domain software tools. The
challenge is how to approach this problem. What methodology or structure should be used?
Thus one of the contributions of this work is the development of a strategy (flow chart), for
solving power delivery problems to localized areas of a national grid through individual or
combinations (e.g. parallel operation) of HVAC and/or HVDC transmission lines. The main
contribution is the evaluation of a HVDC system as a solution to overcoming power delivery
shortages to a localized area of a national grid.
Three different software packages (two industrial and one academic) namely,
PSCAD/EMTDC (time domain), DlgSILENT PowerFactory (frequency domain) and MathCAD
software are evaluated for their capability to perform the simulation studies necessary to
prove the possible solutions given in the developed flow chart. The PSCAD/EMTDC software
package is evaluated for integrated HVAC/HVDC load flow analyses, DlgSILENT for
individual and parallel combinations of HVAC lines and MathCAD to prove hand calculations
to software results.
Five case studies are conducted. The first case study demonstrates a healthy system with no
delivery shortcomings, the second case study portrays the delivery shortcoming due to
increased localized area demand, and the remaining three case studies explore possible
solutions to solve the problem. The first possible solution is to construct an identical HVAC
line in parallel to the existing line.
Subjects/Keywords: Electric power distribution – High tension;
High voltages;
Electric currents, Alternating;
Flexible AC transmission systems;
Electrical engineering
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smith, J. (2009). High voltage direct current strategy solving power delivery shortages to localized area of national grid
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smith, Johan. “High voltage direct current strategy solving power delivery shortages to localized area of national grid
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Johan. “High voltage direct current strategy solving power delivery shortages to localized area of national grid
.” 2009. Web. 27 Feb 2020.
Vancouver:
Smith J. High voltage direct current strategy solving power delivery shortages to localized area of national grid
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1102.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith J. High voltage direct current strategy solving power delivery shortages to localized area of national grid
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1102
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
27.
Negumbo, Rosalia.
Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1103
► Traditionally, harmonics are ignored in overall efficiency and energy usage studies. However, in the modern era, power systems contain levels of harmonics which can no…
(more)
▼ Traditionally, harmonics are ignored in overall efficiency and energy usage studies. However,
in the modern era, power systems contain levels of harmonics which can no longer be
ignored by engineers, planners, energy conservationists and economists. The directions of
power flows have to be considered when harmonics are present in the power network.
A methodology and new formulae for individual and overall efficiency and energy usage is
developed at each frequency (f1, h and H) and forms the main contribution to research in this
field.
Two case studies were conducted; a measurement based laboratory experiment set-up and a simulated case study. In the set-up, measurements of current, voltage and power at different points in the network for the 1st, 5th and 7th frequencies were taken. Current and voltage results were used for hand calculations to prove the measured power flows and directions. The measurements were taken with a Fluke 345 three-phase harmonic power quality analyzer. For the simulated case study, a network was investigated using the DIgSILENT and SuperHarm software packages. Their results were compared and it was found that DIgSILENT is the preferred package for power results.
It was found that the total harmonic distortion limit for voltage in the simulated network
exceeded an acceptable level. The harmonic mitigation solution chosen was to design a
passive filter to decrease the distortion by shifting the resonance point of the network. The
method to design the passive filter and its impact on efficiency and energy usage is included
in the thesis.
Unique power flow direction diagrams are developed as part of the methodology and form an
essential step in the derivation of the new formulae. Efficiencies, power losses and energy
usage at individual and combined frequencies were determined. Results showed the
negative effects of harmonics on overall efficiency, energy usage and power losses of the
system. The methodology and new formulae developed was found to be effective and their
application is recommended for use by industry.
Subjects/Keywords: Electric power distribution;
Harmonics (Electric waves);
Electricity
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Negumbo, R. (2009). Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1103
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Negumbo, Rosalia. “Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1103.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Negumbo, Rosalia. “Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
.” 2009. Web. 27 Feb 2020.
Vancouver:
Negumbo R. Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1103.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Negumbo R. Analysis for electrical energy and overall efficiency in distribution networks with harmonic distortion
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1103
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
28.
Burger, Gert Cloete.
Optimisation of the pulse-echo method with an application to acoustic thermometry
.
Degree: 2010, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1105
► In acoustics, pulse echo methods are well known as a means of measuring time of Hight. Traditional techniques for generating acoustic waves in solid ferromagnetic…
(more)
▼ In acoustics, pulse echo methods are well known as a means of measuring time of Hight. Traditional
techniques for generating acoustic waves in solid ferromagnetic waveguides include piezoelectric,
capacitive and magnetostriction. Piezoelectric and capacitive techniques are preferred
due to the inefficiency of magnetostriction caused by electro-mechanical coupling losses and the
fact that most ferromagnetic materials show low levels of magnetostriction. The aim of this
study was to optimise the magnetostrictive effects for sensing applications based on a ferromagnetic
waveguide using the pulse echo method. The results obtained were implemented in the
design of an acoustic thermometer.
Two configurations for signal generation and recovery were examined, the use of a single
wound copper coil acting as a transceiver coil, and the use of separate transmit and receive
coils. Results obtained using the latter configuration indicated better signal to noise ratio's and
provided the flexibility to manipulate the point of signal recovery. The pulse echo method was
implemented and optimised.
An acoustic thermometer based on an existing design was developed by inducing a partial
reflection from a set position in the waveguide, defining a sensing probe. Awareness of the elastic
properties of the waveguide material enabled the guaging of its temperature by measuring the
acoustic pulse velocity in the probe.
The accuracy of the instrument was increased through signal conditioning, examined together
with cross correlation and an increased sampling frequency. Systematic errors were resolved
through calibration, giving the instrument an overall accuracy of ±O.56"C for the range of
temperatures between 2O"C and 400"C.
Subjects/Keywords: Acoustics – Sound-waves;
Magnetostriction
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Burger, G. C. (2010). Optimisation of the pulse-echo method with an application to acoustic thermometry
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1105
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Burger, Gert Cloete. “Optimisation of the pulse-echo method with an application to acoustic thermometry
.” 2010. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1105.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Burger, Gert Cloete. “Optimisation of the pulse-echo method with an application to acoustic thermometry
.” 2010. Web. 27 Feb 2020.
Vancouver:
Burger GC. Optimisation of the pulse-echo method with an application to acoustic thermometry
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2010. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1105.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Burger GC. Optimisation of the pulse-echo method with an application to acoustic thermometry
. [Thesis]. Cape Peninsula University of Technology; 2010. Available from: http://etd.cput.ac.za/handle/20.500.11838/1105
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
29.
Nketoane, Paseka Augustinus.
Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1106
► More than 70% of the earth's surface is covered by water, only a small part of which is suitable for either human consumption or agricultural…
(more)
▼ More than 70% of the earth's surface is covered by water, only a small part of which is
suitable for either human consumption or agricultural use. Due to pollution from agriculture,
households and industry reaching rivers, lakes and seas it is Important for wastewater to be
properly treated in order to remove harmful substances before it reaches the environment.
Strict environmental and health regulations together with a demand for cost effective ways of
wastewater treatment have made control technology in wastewater Treatment Plants an
important priority. Dissolved oxygen (DO) is the amount of oxygen in the effluent and it plays
a vital role of controlling VV\YTP. Oxygen dissolves in water through mixing water surface
with the atmosphere, The dissolved oxygen concentration in the aerobic part of an activated
sludge process should be sufficiently high to supply enough oxygen to the microorganisms in
the sludge. an excessive high DO leads to high energy consumption and may also
deteriorate the sludge quality, A high DO concentration in the internally recirculated water
also makes the denitrification less efficient Hence, both for economical and process
reasons, it is of interest to control the DO. The used controllers are normally linear
controllers, proportional integral (PI) or proportional integral derivative (PID) ones. The work
of these controllers leads to bad system performance, because, the process of dissolving
oxygen into the wastewater is a nonlinear process and requires nonlinear control.
The aim of the research project is to develop methods for design of linear and nonlinear
controllers of the concentration of the DO in the aeration tank of the WWTP and to implement
the designed controllers in the frameworks of PLC. The nonlinear linearizing controller based
on a reference model and Lyapunov second method is designed. Additionally a linear
controller is developed in a form of PI controller based on pole placement method to improve,
the performance of the closed loop system. The resultant controller is to be on
a PLC as a part of Adroit SCADA system. The developed programmes are used to control
the wastewater treatment process in laboratory scale plant and can be applied as a part of
SCADA software for control of the wastewater treatment plants.
Subjects/Keywords: Sewage – Purification;
Wastewater treatment – South Africa;
Nonlinear control theory;
Adaptive control systems;
System analysis;
MATLAB
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nketoane, P. A. (2009). Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nketoane, Paseka Augustinus. “Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nketoane, Paseka Augustinus. “Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
.” 2009. Web. 27 Feb 2020.
Vancouver:
Nketoane PA. Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nketoane PA. Design and implementation of a nonlinear controller in PLC as a part of an adroit scada system for optimal adaptive control of the activated sludge process
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
30.
Mbango, Fessor.
Investigation into alternative protection solutions for distribution networks
.
Degree: 2009, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/1107
► Recently, due to concerns about the liberalization of electricity supply, deregulation and global impact on the environment, securing a reliable power supply has become an…
(more)
▼ Recently, due to concerns about the liberalization of electricity supply, deregulation and global
impact on the environment, securing a reliable power supply has become an important social
need worldwide To ensure this need is fulfilled, detailed investigations and developments are In
progress on power distribution systems protection and the monitoring of apparatus which Is part
of the thesis.
The main objective of a protection schemes is mainly to keep the power system stable by
isolating only the affected components or the section of the electricity network in which the fault
has developed while allowing the rest of the network to continue operating. It is important to
note that the protection equipment does not prevent faults from occurring, but it limits the
damaging effect of the fault and protects other healthy equipment. This is only achieved if the
protection system of the electrical network involved complies with the requirements and purpose
of the electrical protection standards. These requirements include the Operational speed,
Reliability, Security and Sensitivity. In conventional substations that are still existing Within the
utilities networks, a number of long cables are then used to complete the links between
substation equipment in order for them to communicate (hardwired). This method is
uneconomical and is being phased out completely in the near future. Over the last few years a
new standard for substation automation communication has been developed Within the
International Electrotechnical Commission (IEC), the IEC 61850.
This standard defines the integration requirements of multi-vendor compliant relays and other
lED's for multiple protection schemes as well as control and automation techniques. In this
particular thesis, Distribution protection is the area of interest, particularly the application of
Time and Overcurrent protection schemes. A look into different protection alternatives and the
application of new technologies for Electrical Power Distribution Systems that unify protection
and control units so that they can be incorporated into Intelligent Substation as opposed to the
most existing (conventional substation) is analyzed. The proposed algorithm has been verified
through simulations of the CPUT and Eureka three phase power distribution systems. A testing
Lab is also part of this thesis and Is meant for experiments as well as simulation performance in
order to gain knowledge and skills for designing and engineer substations with lEG 61850
standards equiprnents. The results indicate that the reduction of copper wiring cable has
increased and the communication speed has improved and simplified.
Subjects/Keywords: Electric power distribution – Protection;
Electric change and distribution – Protection;
Electric power transmission
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mbango, F. (2009). Investigation into alternative protection solutions for distribution networks
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1107
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mbango, Fessor. “Investigation into alternative protection solutions for distribution networks
.” 2009. Thesis, Cape Peninsula University of Technology. Accessed February 27, 2020.
http://etd.cput.ac.za/handle/20.500.11838/1107.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mbango, Fessor. “Investigation into alternative protection solutions for distribution networks
.” 2009. Web. 27 Feb 2020.
Vancouver:
Mbango F. Investigation into alternative protection solutions for distribution networks
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2009. [cited 2020 Feb 27].
Available from: http://etd.cput.ac.za/handle/20.500.11838/1107.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mbango F. Investigation into alternative protection solutions for distribution networks
. [Thesis]. Cape Peninsula University of Technology; 2009. Available from: http://etd.cput.ac.za/handle/20.500.11838/1107
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations