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Strategy for power quality improvement and maximum demand smoothing

- Siti, Willy M., Jimoh, Adisa A., Nicolae, Dan-Valentin

An assessment of infrastructure financing in South Africa : a theoretical assessment

- Chiloane, K.O., Aigbavboa, C.O.

  • Authors: Chiloane, K.O. , Aigbavboa, C.O.
  • Date: 2016
  • Subjects: Infrastructure , Finance , South Africa
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/215197 , uj:21377 , Citation: Chiloane, K.O & Aigbavboa, C.O. 2016. An assessment of infrastructure financing in South Africa : a theoretical assessment.
  • Description: Abstract: Infrastructure development in many countries is considered as the most important factor which contributes to production growth by encouraging economic activities, productivity and improving the quality of life. Infrastructure is considered to have a positive and significant effect on productivity growth in all sectors of the economy. Infrastructure development is a means of promoting economic growth and it is essential for any country to investment in infrastructure that will leads to economic growth. Infrastructure is categorized in different category namely: physical infrastructure (which includes water system, electricity, roads and transport, etc.) and social infrastructure (which includes education and health facilities). In simple words infrastructure development aid to stimulates economic growth and create jobs for citizens. This is the indication that government must invest in infrastructure development and enjoy the benefits their investments will stimulates and also to maintain service delivery to the public. The objective of this study is to assess the sources of infrastructure financing in South Africa. The study is conducted with reference to existing theoretical literature, published and unpublished researches in order to assess the sources of infrastructure financing in South Africa. Findings revealed that there are major sources of infrastructure financing which includes: tax revenues; lenders to government or enterprises (loans or guarantees); private investors (equity); development agencies (loans); donors (grants); tariffs and public-private partnerships. The study is conducted with reference to existing literature, unpublished and published research. Hence, this study assess the sources of infrastructure financing in South Africa and presented a robust background on the current sources of infrastructure financing. The findings of this study thus contribute to the body of knowledge on infrastructure financing and other available sources of infrastructure financing other than the use of taxation revenues to finance infrastructure. Furthermore, the findings provides a robust understanding of the need and importance of financing infrastructure.
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The Awareness of information acts to improve students’ knowledge on managing personal information

- Arthur, Joel

  • Authors: Arthur, Joel
  • Date: 2019
  • Subjects: Information acts , University of Johannesburg , Constitution and personal information
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/395872 , uj:32845 , Citation: Arthur, J. 2019. The Awareness of information acts to improve students’ knowledge on managing personal information.
  • Description: Abstract: Over the past years, the South African government has implemented different information acts to protect the South African individuals’ information and their right to privacy. However, without the South African public’s awareness of how to practically use these acts, the mere implementation is not enough. Many first‐year students at the University of Johannesburg are not aware of the dangers of sharing personal information and are also not aware of the role that the different information acts play in their lives. This paper examines and assesses the level of awareness students have of four information acts, particularly with a particular focus on first year Information and Knowledge Management students at the University of Johannesburg. As part of the study, an in‐depth literature review of the information acts in South Africa was conducted. The study employed a quantitative approach and questionnaires were designed with the sole purpose of gathering information. A pre‐test, an intervention and a post‐ test were conducted to gain insight on whether the first year Information and Knowledge management students’ knowledge and awareness of the Information acts would change the manner in which they would use and share their information. It was evident that awareness of the information acts have a direct effect on the individuals use and sharing of personal information. Pre‐test results indicated that student’s lack of awareness of the acts hampered their understanding of how the acts protects them, however the post‐test indicated that awareness directly improves the individuals use of the acts.
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TCP congestion control macroscopic behavior for combinations of source and router algorithms

- Dzivhani, Mulalo, Ngwenya, Dumisa, Masonta, Moshe, Ouahada, Khmaies

  • Authors: Dzivhani, Mulalo , Ngwenya, Dumisa , Masonta, Moshe , Ouahada, Khmaies
  • Date: 2018
  • Subjects: TCP Congestion Control , TCP New Reno , TCP Cubic
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/282152 , uj:30402 , Citation: Dzivhani, M. et al. 2018. TCP congestion control macroscopic behavior for combinations of source and router algorithms.
  • Description: Abstract: The network side of Transmission Control Protocol (TCP) congestion control is normally considered a black-box in performance analysis. However, the overall performance of TCP/IP networks is affected by selection of congestion control mechanisms implemented at the source nodes as well as those implemented at the routers. The paper presents an evaluation of macroscopic behaviour of TCP for various combinations of source algorithms and router algorithms using a Dumbbell topology. In particular we are interested in the throughput and fairness index. TCP New Reno and TCP Cubic were selected for source nodes. Packet First-in-First-out (PFIFO) and Controlled Delay (CoDel) mechanisms were selected for routers. The results show that TCP New Reno performs well, in terms of throughput, in a low BDP scenario. However, as expected in high BDP scenario, TCP New Reno deteriorates and TCP Cubic performs better. CoDel in the network side further deteriorates TCP New Reno flows in high Bandwidth-Delay Product (BDP) scenario, while considerably improving TCP Cubic. PFIFO deteriorates both TCP Cubic and TCP New Reno in high BDP. Almost in all cases CoDel seems to improve fairness.
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Advanced coating: laser metal deposition of aluminium powder on titanium substrate

- Akinlabi, Esther Titilayo, Akinlabi, Stephen A.

  • Authors: Akinlabi, Esther Titilayo , Akinlabi, Stephen A.
  • Date: 2016
  • Subjects: Heat affected zone , Laser metal deposition , Powder metallurgy
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/93266 , uj:20325 , Citation: Akinlabi, E.T. & Akinlabi, S.A. 2016. Advanced coating: laser metal deposition of aluminium powder on titanium substrate.
  • Description: Abstract: Laser Metal Deposition (LMD) is an additive manufacturing technique, which can be used to produce solid components from a Computer Aided Design (CAD) model. The LMD process makes use of feeding powder, which is supported by the shielding gas, into the melt pool that is produced by sharply focused collimated laser beam on the substrate. This study employs aluminium powder in its molten state on titanium substrate through the LMD process. The aluminium powder was deposited at varying laser scanning speeds while the laser power and gas flow rate were kept constant. The presence of alpha phase grains were observed in the microstructures of samples at a lower scanning speed and the beta phase grains at a higher laser scanning speed. It was found that the geometrical properties of the deposits, that is; the width, height and the Heat Affected Zone (HAZ) of each sample decreased as the scan speed increases resulting from the laser-material interaction. The microhardness and the corrosion rates of each sample increased as the laser scanning speed increases.
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The effect of human capital investment and motivation on miners’ productivity at a South African Platinum mine

- Makhubedu, Lucky Boy Tebogo, Nwobodo-Anyadiegwu, Eveth Nkeiruka, Mbohwa, Charles

Biogas use as fuel in spark ignition engines

- Kukoyi, T.O., Muzenda, E., Akinlabi, Esther Titilayo, Mashamba, A., Mbohwa, Charles, Mahlatsi, T.

Time programmable smart devices for peak demand reduction of smart homes in a microgrid

- Longe, O. M., Rimer, S., Ouahada, K., Ferreira, Hendrik C.

  • Authors: Longe, O. M. , Rimer, S. , Ouahada, K. , Ferreira, Hendrik C.
  • Date: 2015
  • Subjects: Time programmable smart devices , Smart homes , Peak demand , Microgrid
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/85579 , uj:19364 , Citation: Longe, O.M. et al. 2015. Time programmable smart devices for peak demand reduction of smart homes in a microgrid.
  • Description: Abstract: Increasing electricity access through Microgrids for rural areas is often faced with the challenge of increased peak demand through increased electricity demand as more electronic devices will be acquired by the consumers and more small businesses will spring up in the community. If not taken care of, this leads to additional cost of incurring higher peaker plants to meet the peak demand, and the burden of the cost of peaker plants are consequentially transferred to the consumers. Since this load is generated by the consumers, it is most desirable to control the peak demand from the consumers’ side. Therefore, a method of Time Programmable Smart Devices (TPSD) with an efficient Electricity Use Plan (EUP) is proposed in this paper by introducing appliance working knowledge and improving load shifting technique of Demand Side Management for peak demand reduction in a rural Microgrid. This method yielded lower morning and evening peaks, a lower peak-to-peak difference than those available in literature, and a peak period shift from the traditional peak period to traditional off-peak period. These lead to financial savings, reduced cost of peaker plants and a safer environment from less greenhouse gases emissions.
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Master’s of engineering management : graduation rates lagging behind growth rate

- Marnewick, A., Pretorius, J.H.C.

Modelling of abandoned mine flooding - water quality and treatment requirement over time

- Huberts, R

Service recovery and customer delight : examination of differences between customers in different spending categories

- Alexander, Theo-Anne, Mpinganjira, Mercy

  • Authors: Alexander, Theo-Anne , Mpinganjira, Mercy
  • Date: 2017
  • Subjects: Service failure , Customer satisfaction , Customer delight
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/260088 , uj:27378 , Citation: Alexander, T.A. & Mpinganjira, M. 2017. Service recovery and customer delight : examination of differences between customers in different spending categories.
  • Description: Abstract: Customer delight is known to exert positive significant influence on levels of customer loyalty even in service recovery situations. This study aimed at examining differences between lower and higher spending customers of cell-phone network service providers in their response to service recovery efforts. Data used in the analysis was collected from 540 customers from Gauteng, South Africa using a structured questionnaire. The findings show significant differences between lower and higher spending customers in their levels of customer delight following service recovery efforts. Lower spending customers were specifically found to show higher level of delight compared to higher spending customers. The findings point to the need for managers to take cognisance of the fact that service recovery efforts may have different effects on different customer segments. Managers need to identify recovery strategies that are appropriate for different customer segments and monitor their effectiveness in ensuring customer delight following service recovery efforts.
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Loose biomass briquettes production process in Maphophe village of Limpopo province of South Africa

- Shuma, Reuben M., Madyira, Daniel M.

  • Authors: Shuma, Reuben M. , Madyira, Daniel M.
  • Date: 2017
  • Subjects: Biomass , Combustion , Production and energy content
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/249424 , uj:25953 , Citation: Shuma, R.M. & Madyira, D.M. 2017. Loose biomass briquettes production process in Maphophe village of Limpopo province of South Africa.
  • Description: Abstract: Deforestation has significantly affected availability of reliable low cost energy resources in low income rural households. As a result, off grid communities are becoming less and less reliant on round wood for energy. However, large amounts of agricultural and forestry residues that are produced annually are destroyed in perennial veld fires and some are deliberately destroyed to prepare for new crop fields. Accessing these loose agricultural and forest residues for energy use is one possible panacea. In the process, the challenges of deforestation can also be partly addressed. The main aim of this paper is to report on adopted methods to produce loose biomass briquettes using agricultural and forestry residues collected from the Maphophe village in Limpopo Province of South Africa. The goal was to avail workable processes for harnessing energy from loose biomass available in this locality. Production methods, energy content and combustion behaviour formed key performance variables. Two types of binders were tried, namely cow dung and cactus plant paste. A 30 tonne hydraulic press was using to compact the mixture of loose biomass and binder into briquettes. Out of 12 loose biomass samples collected, the best performing include ground nutshells, Mopani leaves, yellow thatching grass and sugarcane leaves. Performance was based on density, energy content and combustion behaviour. Cow dung was found to be the best binder and produced briquettes that offer a viable energy source for off grid communities.
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Service satisfaction and behavioural intention in the cell phone network service provider industry – a comparisson between customers of different cell phone network service providers

- Cunningham, Nicole, Verissimo, M.

  • Authors: Cunningham, Nicole , Verissimo, M.
  • Date: 2017
  • Subjects: Cell phone network industry , Cell phone network service providers , Service satisfaction
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/238146 , uj:24413 , Citation: Cunningham, N. & Verissimo, M. 2017. Service satisfaction and behavioural intention in the cell phone network service provider industry – a comparisson between customers of different cell phone network service providers.
  • Description: Abstract: South Africa’s cell phone network service providers have gained a reputation of providing inadequate levels of service. The study relayed in this article aims to uncover the customers’ level of satisfaction with their cell phone network service providers, and how this satisfaction influences their behavioural intention in the South African context. This will enable cell phone network service providers to understand the relationship between satisfaction and behavioural intention, which in turn will contribute to developing customer satisfaction and retention strategies, as well as long-term customer loyalty. A total of 500 usable questionnaires were retained for data analysis. The study has uncovered a statistically significant difference between Vodacom and MTN customers with regard to their overall service satisfaction and overall behavioural intention, and this resulted in a partial acceptance of the hypotheses. The results of the study further reveal that customers of different cell phone network service providers feel positive towards their service provider and about doing business with them, but do not believe the interaction is the best outcome that can be achieved. The results also reveal that customers intend to continue using their cell phone network service provider in the future, but are not willing to recommend them to other people. Cell phone network service providers should therefore make adjustments to improve their customer service, quality and strategies to retain customers and increase customer satisfaction.
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A ranking methodology to prioritise artisanal and small-scale mining projects

- Rupprecht, Steven

  • Authors: Rupprecht, Steven
  • Date: 2018
  • Subjects: ASM , Project ranking
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/278582 , uj:29898 , Citation: Rupprecht, S. 2018. A ranking methodology to prioritise artisanal and small-scale mining projects.
  • Description: Abstract: There are a number of interested parties active in the minerals industry that doesn’t fully understand the requirements to explore and develop projects. These parties are important to the industry, as they will often provide financial support to mineral projects with the intent of securing the off-take of the metal concentrate. However, these same individuals are unable to support the technical aspects of mining to support artisanal and small-scale miners. This paper provides a methodology to assist potential investors in the area of exploration and project development. By investigating a number of inputs into project development, a ranking methodology is proposed to prioritise artisanal and small-scale mining projects. The following areas are discussed as a means to rank projects: • Historical mining method • Strike and depth of mineralisation • Thickness and continuity of mineralisation • Infrastructure Based on the above criteria potential investors should be better informed as to which of their projects offers the best opportunity towards development of a mining operation.
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An analyses of the effect of living habits on water conservation among Gauteng residents

- Gule, Palesa T., Maduku, Daniel K., Dilotsotlhe, Nombulelo

  • Authors: Gule, Palesa T. , Maduku, Daniel K. , Dilotsotlhe, Nombulelo
  • Date: 2018
  • Subjects: Attitude , Living Habit , Intention to Conserve Water
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/273328 , uj:29116 , Citation: Gule, P.T., Maduku, D.K. & Dilotsotlhe, N. 2018. An analyses of the effect of living habits on water conservation among Gauteng residents.
  • Description: Abstract: South Africa’s water resources are constantly under pressure as a result of severe weather conditions, pollution, destruction of wetlands and a growing population. Although efforts to increase awareness of water conservation have been implemented, household usage continues to rise. Previous studies have highlighted the major issues militating against water conservation behaviour, but more research is necessary in the South African context. The purpose of this study, therefore, was to understand the impact of living habits on water conservation behaviour among Gauteng residents, using a research model that integrates living habits into the Theory of Reasoned Action (TRA). Data for empirical testing of the proposed research model was obtained from the responses of 347 respondents in Gauteng. The empirical results of the analysis indicate that respondents’ habits and intention to conserve water have significant and positive effects on water conservation behaviour. The results further reveal that attitude, subjective norm and living habits exert a significant and positive influence on intention to conserve water. The implications of these findings for strategies aimed at water conservation among consumers in the province and others in similar contexts are presented.
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Barriers of sharing tacit knowledge : A case of Gauteng agricultural SMMEs, South Africa

- Seseni, Lawrance, Mbohwa, Charles

Cronbach’s alpha reliability coefficient in engineering assessments – a preliminary study on possibilities and precautions

- Ekolu, Stephen O.

Developing a framework of food choice determinants among construction workers in South Africa

- Okoro, C. S., Musonda, I., Agumba, J. N.

The question of integrated development project versus integrated community : a case of Cosmo City mixed-income housing development, Johannesburg, South Africa

- Onatu, G., Mbinza, Z., Ogra, A., Joseph, M.

Modelling and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS

- Ukoba, Kingsley, Jen, Tien-Chien

  • Authors: Ukoba, Kingsley , Jen, Tien-Chien
  • Date: 2019
  • Subjects: Cu2O, Performance, Nanostructured
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/${Handle} , uj:33029 , Citation : Ukoba, K. 2019. Modelling and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS
  • Description: Abstract : This paper reported numerical simulation and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells. The solar cells equations were modelled and thereafter theoretical validation of the nanostructured metal oxides was performed. The model working points include a room temperature of 300K, input power of 1000W/m2 using an illumination of AM1.5 lamp, and thickness of 2 μm. The modelled solar cell exhibits a short-circuit current (Jsc) of 0.2819 A, the open-circuit voltage (Voc) of 0.1640 V, the fill factor (FF) of 0.28, and the efficiency (η) of 13.38% at 2.00 μm thickness. Also, the band gap, electron affinity and Nyquist plot were obtained for the solar cells. This will serve as a theoretical guide for laboratory research on the improvement of efficiency of Cu2O metal oxide solar cells. This will open a new frontier for modelling of metal oxide based thin films solar cells especially Cu2O thin films solar cells. This is boaster in the quest to develop affordable and sustainable energy by encouraging more research in solar cells technologies in low-income countries.
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