Gasification characteristics of sugarcane bagasse
- Authors: Anukam, Anthony Ike
- Date: 2013
- Subjects: Bagasse -- Bagasse industry , Sugarcane -- Biotechnology , Computer simulation
- Language: English
- Type: Thesis , Masters , MSc (Chemistry)
- Identifier: vital:11343 , http://hdl.handle.net/10353/d1016170 , Bagasse -- Bagasse industry , Sugarcane -- Biotechnology , Computer simulation
- Description: Sugarcane is a major crop in many countries. It is the most abundant lignocellulosic material in tropical countries such as South Africa. It is one of the plants with the highest bioconversion efficiency. The sugarcane crop is able to efficiently fix solar energy, yielding some 55 tons of dry matter per hectare of land annually. After harvest, the crop produces sugar juice and bagasse. Sugarcane bagasse is a residue that results from the crushing of sugarcane in the sugar industry. It is a renewable feedstock that can be used for power generation and manufacturing cellulosic ethanol. As biomass, sugarcane bagasse holds promise as a fuel source since it can produce more than enough electricity and heat energy to supply the needs of a common sugar factory. However, in the sugarcane industry the bagasse is currently burnt inefficiently in boilers that provide the heating for the industry. This project seeks to investigate the possibility of gasifying sugarcane bagasse as an efficient conversion technology. The investigation is necessary because fuel properties govern the gasifier design and ultimately, the gasification efficiency. Proximate and ultimate analysis of sugarcane bagasse was conducted after which the results were used to conduct a computer simulation of the mass and energy balance during gasification. The kinetic investigation undertaken through the TGA and DTG analyses revealed the activation energy and pre – exponential factor which were obtained by the model – free Kissinger method of kinetic analysis and were found to be 181.51 kJ/mol and 3.1 × 103/min respectively. The heating value of sugarcane bagasse was also measured and found to be 17.8 MJ/kg, which was used in the calculation of the conversion efficiency of the gasification process. Fuel properties, including moisture content and gasifier operating parameters were varied in order to determine optimum gasifier operating conditions that results in maximum conversion efficiency. The highest conversion efficiency was achieved at low moisture content after computer simulation of the gasification process. Moisture content also affected the volume of CO and H2 as the former decreases with increasing moisture content while the latter increases with increasing moisture content, accelerating the water – gas reaction. Scanning electron microscope fitted to an Energy dispersive X – ray spectroscopy was also used in order to view the shape and size distribution as well as determine the elemental composition of sugarcane bagasse. The results obtained established that the fuel properties and gasification conditions affect the conversion efficiency. During computer simulation, it was established that smaller particle size resulted in higher conversion efficiency. The smaller throat diameter also resulted in higher conversion efficiency. The throat angle of 25° also resulted in higher conversion efficiency. The temperature of input air was also found to be one of the major determining factors in terms of conversion efficiency. The dissertation presents the proximate and ultimate analysis results as well as the kinetic analysis results. The SEM/EDX analysis as well as the computer simulation results of the gasification process is also presented. The major contribution of this project was on the investigation of the gasification characteristics of sugarcane bagasse and the utilization of these in the design of a laboratory scale sugarcane bagasse gasifier with enhanced conversion efficiency through computer simulation.
- Full Text:
- Date Issued: 2013
Experiences by orphaned children as learners at a Secondary School in the Maluti District of Education in the Eastern Cape
- Authors: Jackson, David Moses
- Date: 2012
- Subjects: Learning -- South Africa -- Eastern Cape , Orphans -- Education -- South Africa -- Eastern Cape , School children -- South Africa -- Eastern Cape , Orphans -- South Africa -- Eastern Cape , High school students -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , M Ed
- Identifier: vital:16187 , http://hdl.handle.net/10353/d1006247 , Learning -- South Africa -- Eastern Cape , Orphans -- Education -- South Africa -- Eastern Cape , School children -- South Africa -- Eastern Cape , Orphans -- South Africa -- Eastern Cape , High school students -- South Africa -- Eastern Cape
- Description: The aim of this study was to investigate the schooling experiences of four orphaned learners at Mandini Secondary School in the Maluti District of Education in the Eastern Cape. The study adopted a qualitative research methodology and a phenomenological research design. Purposive sampling was adopted and the tape recorded narrative responses of all four respondents, were obtained from the use of in-depth phenomenological unstructured interviews. The respondents were four orphaned children (two males and two females) between the ages of fifteen and twenty years. The study used the Social Rupture Theory as lenses of analysis of the findings. This was considered a very sensitive topic because the respondents had to relate issues which could result in them reliving traumatic experiences. As a result more attention was paid on ethical issues and making the respondents feel comfortable. The respondents were capable of distinguishing between their quality of life while their parents were still alive and well; when they (the parent[s]) became sick and when they eventually died. Furthermore, the respondents highlighted the negative effects of parental absence in their education. In addition, these orphaned children formed relationships with the school community after their parents’ death which, to some extent, had a positive effect on their schooling. Based on these findings the study suggests that educators need to be trained in diagnosing psycho-social problems and given skills to deal with them. Similarly, short courses should be organized for guardians and community development workers in identifying and counseling of problems.
- Full Text:
- Date Issued: 2012
E-mail forensic authorship attribution
- Authors: Lalla, Himal
- Date: 2010
- Subjects: Electronic evidence , Electronic mail systems , Authorship , Electronic mail messages , Signatures (Writing) , Writing -- Identification , Forensic accounting
- Language: English
- Type: Thesis , Masters , MCom (Information Systems)
- Identifier: vital:11128 , http://hdl.handle.net/10353/360 , Electronic evidence , Electronic mail systems , Authorship , Electronic mail messages , Signatures (Writing) , Writing -- Identification , Forensic accounting
- Description: E-mails have become the standard for business as well as personal communication. The inherent security risks within e-mail communication present the problem of anonymity. If an author of an e-mail is not known, the digital forensic investigator needs to determine the authorship of the e-mail using a process that has not been standardised in the e-mail forensic field. This research project examines many problems associated with e-mail communication and the digital forensic domain; more specifically e-mail forensic investigations, and the recovery of legally admissible evidence to be presented in a court of law. The Research Methodology utilised a comprehensive literature review in combination with Design Science which results in the development of an artifact through intensive research. The Proposed E-Mail Forensic Methodology is based on the most current digital forensic investigation process and further validation of the process was established via expert reviews. The opinions of the digital forensic experts were an integral portion of the validation process which adds to the credibility of the study. This was performed through the aid of the Delphi technique. This Proposed E-Mail Forensic Methodology adopts a standardised investigation process applied to an e-mail investigation and takes into account the South African perspective by incorporating various checks with the laws and legislation. By following the Proposed E-mail Forensic Methodology, e-mail forensic investigators can produce evidence that is legally admissible in a court of law.
- Full Text:
- Date Issued: 2010
Deriving value from IT investments within botique hotels: a Buffalo City case study
- Authors: Mathe, Thabelang
- Date: 2009
- Subjects: Information technology , Hotels -- Finance , Boardinghouses -- Finance , Small business -- South Africa -- Eastern Cape , Small business -- Finance
- Language: English
- Type: Thesis , Masters , MCom (Information Systems)
- Identifier: vital:11134 , http://hdl.handle.net/10353/d1000975 , Information technology , Hotels -- Finance , Boardinghouses -- Finance , Small business -- South Africa -- Eastern Cape , Small business -- Finance
- Description: Even though many organizations invest in IT, the value that IT is expected to contribute is still not clearly understood. Researchers agree that IT has become a crucial element to business operations and business existence. However, while there is continued investment in new information technologies and systems, organizations are not certain whether significant value is derived from IT investments. The failure to realize good return on IT investments is ascribed to a lack of understanding of IT by organizations and also the failure by organizations to align IT strategies with business strategies. The lack of alignment leads to the failure to match the right IT to the correct task, which leads to the poor application of systems and poor allocation of human resources to tasks. Therefore, organizations such as Small and Medium Enterprises (SMEs) in particular Boutique Hotels, are noted for their failure to derive better IT value. Their unique characteristics are understood to be influential in the way IT is used and managed by affecting the delivery of value from technology. In order to enable Boutique Hotels to derive more value from IT, the IT governance frameworks, Val IT and CobiT (ITGI, 2007), were examined as these integrate good practices to ensure that an organization‘s IT supports the business objectives. In addition, the Task Technology Fit (TTF) (Goodhue and Thompson, 1995) and Gap Analysis (Heeks, 2001) theories were highlighted as these prescribe the platform ideal for more value to be derived from IT. The current status of Boutique Hotels in Buffalo City was assessed through the use of questionnaires and interviews. The collected data was analyzed and resulted in the development of a model that can be used by Boutique Hotels in order to derive more value from IT and to maximize the use of IT.
- Full Text:
- Date Issued: 2009
Critiquing the viability of a trade biased approach to regional integration in Southern Africa
- Authors: Chipendo, Kudakwashe
- Date: 2008
- Subjects: Regionalism -- Africa, Southern , International economic integration
- Language: English
- Type: Thesis , Masters , M Soc Sc (Dev)
- Identifier: vital:11409 , http://hdl.handle.net/10353/163 , Regionalism -- Africa, Southern , International economic integration
- Description: Africa’s international marginalization is preponderantly conceptualized through world systems approaches, particularly structural dependency. Consequently, the region’s socioeconomic quagmire, characterized by economic stagnation, abysmal poverty, inequality and foreign dependency, is often attributed to its colonial heritage. Particular reference is made to the small size of the African state and its structural specialization in primary production. Collective self reliance based on mutual interdependence (regional integration) thus suggests itself as a logical way to overcome the structural constraints imposed by the small size of the state, while at the same time representing a viable alternative to asymmetric trade with developed countries. It is within the context of this theoretical framework that this study critiques the predisposition of the regional body in Southern Africa, the Southern African Development Community (SADC), towards a trade biased approach to regional integration (market integration). This critique is based on theoretical and empirical findings showing that trade led strategies are primarily suited for developed countries with robust manufacturing industries and complimentary production structures. Countries in Southern Africa are however characterized by a near absence of manufacturing industries, are at different levels of development and show low levels of trade complementarities. This study therefore concludes that market integration is an inappropriate strategy for regional integration in Southern Africa and in the process suggests development integration – a political economy approach, as an alternative.
- Full Text:
- Date Issued: 2008
Design and implementation of a network revenue management architecture for marginalised communities
- Authors: Tarwireyi, Paul
- Date: 2007
- Subjects: Community development -- South Africa -- Eastern Cape , Computer network architectures -- South Africa -- Design and construction , Computer network protocols -- South Africa -- Eastern Cape -- Design and construction , Revenue management , Computer networks -- Social aspects
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11374 , http://hdl.handle.net/10353/72 , Community development -- South Africa -- Eastern Cape , Computer network architectures -- South Africa -- Design and construction , Computer network protocols -- South Africa -- Eastern Cape -- Design and construction , Revenue management , Computer networks -- Social aspects
- Description: Rural Internet connectivity projects aimed at bridging the digital divide have mushroomed across many developing countries. Most of the projects are deployed as community centred projects. In most of the cases the initial deployment of these projects is funded by governments, multilateral institutions and non-governmental organizations. After the initial deployment, financial sustainability remains one of the greatest challenges facing these projects. In the light of this, externally funded ICT4D interventions should just be used for “bootstrapping” purposes. The communities should be “groomed” to take care of and sustain these projects, eliminating as soon as possible a dependency on external funding. This master thesis presents the design and the implementation of a generic architecture for the management of the costs associated with running a computer network connected to the Internet, The proposed system, called the Network Revenue Management System, enables a network to generate revenue, by charging users for the utilization of network resources. The novelty of the system resides in its flexibility and adaptability, which allow the exploration of both conventional and non-conventional billing options, via the use of suitable ‘adapters’. The final goal of the exploration made possible by this system is the establishment of what is regarded as equitable charging in rural, marginalized communities - such as the community in Dwesa, South Africa.
- Full Text:
- Date Issued: 2007