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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
151

The adoption of the internet as an advertising medium by bed and breakfast establishments in Bushbuckridge

Lebambo, Mmashakoane Marcia. January 2014 (has links)
M. Tech. Entrepreneurship / Looks at how bed and breakfast managers in Bushbuckridge perceive the attributes of the internet as an advertising medium. It also looks at the advertising media that are currently used by bed and breakfast accommodations businesses in Bushbuckridge for both local and international customers.
152

An alternative approach to the evaluation of poynting vector synthesis.

De Villiers, Abraham C. January 2014 (has links)
M. Tech. Electrical Engineering. / Produces findings, based on scientific methods, to verify or refute electromagnetic propagation, generated with Synthetic Poynting Vector formation, that will enable small but efficient electrical antennas.
153

A manifestation of corporate social responsibility in a South African organization

Ntuli, Penelope Sibongile. January 2014 (has links)
M. Tech. Public relations management / The objective of this study was to determine how a South African company such as Tiger Brands Limited perceives the use of CSR as a strategic communication tool. Underpinned by Carrolls four pillars of CSR, the study assessed the perception and extent of CSR practices as a strategic communication tool within that company. Of specific interest to this study was the extent to which CSR was perceived to be aligned to the companys various responsibilities, how positively or negatively these alignments were viewed, as well as the reasons put forward for all these views.
154

Investigation of energy savings technologies for cold rooms.

Mulobe, Ngoy Jean-Claude. January 2014 (has links)
M. Tech. Engineering: Mechanical. / Determines the highest energy savings which could be achieved by using variable air ventilation (VAV) strategy in cool processing, without affecting the performance of the cold room.
155

Control of sit-to-stand exoskeleton with human in the loop.

Tchonko, Hervé Patrick. January 2014 (has links)
M. Tech. Electrical engineering. / Discusses the process of standing from a chair is the first movement to be affected by physical impairment or ageing. That justified the increase of researches around sit-to-stand movements nowadays.This thesis presents the design of a four links wearable device that can assist disable people to stand from a sitting position. The four links are joined at the ankle, the knee and the HAT (Head, Arm and Trunk) where actuators are mounted. The system is built around three controllers. The Goal Controller drives the links along their reference trajectories, the Stability Controller makes sure that the system does not collapse as it is rising, and the last controller combines the signal from the 2 first ones.The reference trajectories are obtained from data recorded from healthy people performing the movement. The main idea behind the present design is that from seat off, the floor projection of the body centre of pressure is evaluated and compared to the most stable position. The stability controller generates the torque necessary to compensate the deviation, while the third controller adjusts the level of participation of that torque to satisfy both the trajectory and the stability objectives. Similar idea was previously found in Prinz (2010).
156

Hydrothermal synthesis and characterization of high-silica MFI zeolites with Titanium heteroatoms in the matrix and their testing in the catalytic oxidation with hydrogen peroxide as the oxidant.

Maanaso, Morule Fortune. January 2014 (has links)
M. Tech. Chemical Engineering. / Discusses the scope of this research study composes of three interactive steps. The first step involves the design of the specific zeolite system (ZSM-5) and the set-up of an autoclave reactor for the hydrothermal synthesis of this and other zeolites and nano materials, then the oxidation catalyst (TS-1) development, i.e. the substitution of aluminium with titanium in the zeolite framework, and finally the formulation and preparation of the isomorphous Silicalite zeolite by omitting the aluminium in the synthesis. And further, set-up of suitable equipments and apparatus for the catalytic testing of the Titanium Silicalite-1 in the oxidation reaction of phenol as the test reaction. Therefore, the overall objectives of this research are: set up an autoclave reactor for the hydrothermal synthesis, formulation of a synthesis recipe for MFI family of catalysts in the laboratory, synthesis of ZSM-5, Silicalite-1, and TS-1 zeolites catalysts in the laboratory, characterization and optimization of the of catalysts listed above, testing the Ti-Silicalite catalyst in the oxidation reaction of phenol with hydrogen peroxide, as the oxidant, set up analytical system (Gas Chromatography, ASS) for analysis of catalyst performance in the oxidation reaction, Evaluate the conversion of the reaction and the selectivity of the individual catalysts reaction Evaluate the conversion of the reaction and the selectivity of the individual catalysts reaction and verify results obtained and compare with systems described in the literature.
157

Design of an eco-friendly press brake using screw jack principles.

Tshawe, Chris Dumisani. January 2014 (has links)
M. Tech. Industrial Engineering. / Discusses the main objectives of this research are to; analyse the current state of press brakes technology ; develop a press brake concept using the Screw Jack System applying DFM (designing for manufacturability) principles and to fabricate a mini prototype Screw Jack Press Brake.
158

Behaviour of unconfined cemented materials under dynamic loading.

Matheba, Mokgele Johannes. January 2013 (has links)
M. Tech. Engineering: Civil. / Aims investigate the response of cement stabilised sub-base layers to dynamic load by evaluating the changes in stiffness at known strain level, and to compare the stiffness from dynamic loads with those derived from the Unconfined Compressive Stress (UCS) test.
159

Key success factors influencing the productivity of administrative employees in the South African public sector

Van Antwerpen, Sumei. January 2013 (has links)
D. Tech. Business Administration / Focuses on non-managerial administrative employees in the South African public service. The primary objectives of most public sector organisations are to provide a social benefit on a limited budget and to reduce costs. These objectives are in direct contrast to private sector organisations whose primary focus is on increasing profits.
160

Evaluation of inorganic corrosion inhibition of mild steel and Aluminium alloy in acidic environment.

Sanni, Omotayo. January 2013 (has links)
M. Tech. Chemical Engineering. / Discusses the effect of ferrous gluconate (FG) and zinc gluconate (ZG) as novel corrosion inhibitors on the corrosion rate of mild steel and aluminium alloy in 3.5% NaCl and 0.5 M H2SO4 media was investigated by electrochemical and weight loss techniques. The effect of inhibitor concentration was investigated. The concentration of these inhibitor ranges from 0.5 to 2.0% g/v at a temperature of 28OC. The synergetic effect of these inhibitors was also studied. High resolution scanning electron microscopy equipped with energy dispersive spectroscopy (HR-SEM/EDS) and Raman spectroscopy was used to characterize the surface morphology of the metals before and after corrosion. Experimental results revealed that ferrous gluconate and zinc gluconate in 3.5% NaCl and 0.5 M H2SO4 solution decreased the corrosion rate at the different concentrations studied. Maximum inhibition efficiency of 100% was achieved for mild steel at 0.5% g/v concentration of FG, 0.5% g/v concentration of ZG and 1.5% g/v synergetic of FG + ZG in 3.5% NaCl solution. Similarly, 100% inhibition efficiency was obtained for aluminium alloy at different media studied (3.5% NaCl and 0.5 M H2SO4). The experimental results obtained from potentiodynamic polarization method showed that the presence of FG and ZG in 3.5% NaCl and 0.5 M H2SO4 solutions decreases the corrosion current densities (icorr) and corrosion rates (CR), and increases the polarization resistance (Rp). It was observed that the inhibitor efficiency depends on the corrosive media, concentration of the inhibitor and the substrate material. The adsorption characteristics of FG and ZG were best described by the Langmuir and Freundlich isotherms. Good correlation exists between the results obtained from both polarization and weight loss methods.

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