This diploma thesis deals with the analysis of aesthetic defects occurring on buildings and their influence on the construction cost. The aim of this work is to study the issue of the valuation of aesthetic defects and then a case study to show how aesthetic defects will increase the construction costs and what costs it will impose upon their removal. To conclude this thesis I compared the removal costs of aesthetic defects with the value decrease of not removing these defects on the family house used for the case study

This thesis deals with diagnostics of photovoltaic panels especially with infrared diagnostics. There are described defects which we can examine using thermovision and also this thesis explains the cause of their formation. Practical part deals with the design of the program that automatically detects defects on infrared images.

Dans le cadre de l’entreposage et du stockage des colis de déchets nucléaires et du transport de combustibles usés, nous nous sommes intéressés par l’étude de la production d’hydrogène de deux produits de corrosion de l’aluminium : l’hydroxyde d’aluminium (Al(OH)3) et l’oxyhydroxyde d’aluminium (AlO(OH)).La production du dihydrogène par irradiation de ces matériaux a été étudiée en fonction de la taille et de la structure que ce soit à température ambiante ou après. Afin d’avoir une meilleur compréhension des mécanismes de production de ce gaz, les défauts créés par irradiation ont été caractérisés en utilisant la Résonnance Paramagnétique Electronique (RPE). Différentes sources d’irradiation ont été utilisées comme le rayonnement Gamma, les électrons accélérés et les ions lourds. Dans un second temps, l’effet de l’hydratation de surface des matériaux a été également étudié. Enfin, l’effet de la présence d’impuretés sur la production de H2 a été brièvement étudié. / Dihydrogen production is a critical issue for the current management of nuclear wastes. One potential source of hydrogen generation is the radiolysis of hydrated mineral phases encountered in the nuclear waste transportation and storage casks. We chose to study aluminum hydroxide (Al(OH)3) (Bayerite) and oxyhydroxides (AlOOH) (Boehmite) as model compounds. The determination of molecular hydrogen production was evaluated with respect to structure and particle size at room temperature and after annealing. In order to have a better understanding of the mechanisms and to identify the precursors of molecular hydrogen, we studied the irradiation defects and their stabilities using Electron Paramagnetic Resonance (EPR). The effect of adsorbed water and structural water on the molecular hydrogen production was studied. Different radiation sources were used such as Gamma radiation, electron beam radiations and heavy ions. In the last part, preliminary results related to the impact of impurities on hydrogen production are presented.

This master thesis studies the behaviour of two aluminium alloys in ultrasonic cleaning at two different intensities, as well as the effect of a cleaning solution, Formula 815 GD-NF on the same surface have been studied with respect to surface roughness and material composition. Methods like Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and 3D topography using white light interferometry (VSI) was used to study the surface and material composition. It was found that both the ultrasonic cleaning, as well as the solution itself both increase surface roughness of the samples. When crossing a threshold in ultrasonic intensity micro jet cavitation dislodge precipitates, or areas weakened by precipitate to form a large pit. And the following heat from the jet causes the surface to oxidise, becoming more brittle, and be broken up by other cavitation phenomena to cause rapid acceleration of surface roughness in an area originating from the pit.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

This study was commissioned to examine the applied leadership styles that foster organisational commitment and product quality commitment levels of two groups of employees working at two different business units of same private sector steel manufacturing company in Gauteng. The samples included 226 production employees from business unit ‘A’ and 190 production employees from population ‘B’. The combined sample of 416 included 83 managers and 333 low level employees. Leadership style data was collected through the Multi-Factor Leadership Questionnaire (MLQ) from the managers and Organisational and Product Quality data was gathered through the Employee Questionnaire (EQ). The MLQ measured nine constructs of the Full Range Leadership Theory while the EQ measured four constructs of identification, affiliation, exchange and product quality commitment levels among lower level employees. A total of 416 questionnaires were distributed and 274 were received. The data was analysed statistically to define the leadership styles, the levels of organisational and product quality commitment and come up with correlations. It was found that transformational and transactional leadership styles were predominant at both business units. Laissez-faire style was also being used at business unit ‘A’. The leadership styles were found to be below the ideal levels for effective leadership. Leaders were perceived to be active managers and not leaders. The organisational and product quality commitment levels among employees were found to be marginal at both units. The top leadership styles and commitment levels trended the same and scored closely for both business units with small variations. The results were comparable. Positive correlations were found between identification commitment (0.305 for ‘A’ and 0.481 for ‘B’) and product quality commitment among employees. It was concluded from the correlations that the higher the levels of organisational commitment, the higher the levels of product quality commitment among employees. By statistical averages, it was concluded that higher levels of transformational leadership fosters higher levels of identification commitment and product quality commitment among employees. Demographics affected the way the respondents answered the questions. A leadership model complete with recommendations was proposed with the intention of increasing leadership effectiveness in order to positively impact and foster product quality commitment among employees. / MBA, North-West University, Potchefstroom Campus, 2014

This study was commissioned to examine the applied leadership styles that foster organisational commitment and product quality commitment levels of two groups of employees working at two different business units of same private sector steel manufacturing company in Gauteng. The samples included 226 production employees from business unit ‘A’ and 190 production employees from population ‘B’. The combined sample of 416 included 83 managers and 333 low level employees. Leadership style data was collected through the Multi-Factor Leadership Questionnaire (MLQ) from the managers and Organisational and Product Quality data was gathered through the Employee Questionnaire (EQ). The MLQ measured nine constructs of the Full Range Leadership Theory while the EQ measured four constructs of identification, affiliation, exchange and product quality commitment levels among lower level employees. A total of 416 questionnaires were distributed and 274 were received. The data was analysed statistically to define the leadership styles, the levels of organisational and product quality commitment and come up with correlations. It was found that transformational and transactional leadership styles were predominant at both business units. Laissez-faire style was also being used at business unit ‘A’. The leadership styles were found to be below the ideal levels for effective leadership. Leaders were perceived to be active managers and not leaders. The organisational and product quality commitment levels among employees were found to be marginal at both units. The top leadership styles and commitment levels trended the same and scored closely for both business units with small variations. The results were comparable. Positive correlations were found between identification commitment (0.305 for ‘A’ and 0.481 for ‘B’) and product quality commitment among employees. It was concluded from the correlations that the higher the levels of organisational commitment, the higher the levels of product quality commitment among employees. By statistical averages, it was concluded that higher levels of transformational leadership fosters higher levels of identification commitment and product quality commitment among employees. Demographics affected the way the respondents answered the questions. A leadership model complete with recommendations was proposed with the intention of increasing leadership effectiveness in order to positively impact and foster product quality commitment among employees. / MBA, North-West University, Potchefstroom Campus, 2014

GaAsBi is a relatively unexplored alloy with interesting features such as a large bandgap reduction for a given lattice mismatch with GaAs substrates and good photoluminescence which make it promising for long wavelength light detection and emission applications. In this research, the molecular beam epitaxy (MBE) method was used to grow epi-layers and hetero-structures. A Vertical-external-cavity surface-emitting-laser (VECSEL) was grown as a part of collaboration with Tampere University in Finland. The process of laser growth promoted the writer’s skills in the growth of hetero-structures and led into an investigation of the effect of growth conditions on GaAsBi optical properties with important results. For instance, when the substrate temperature during growth was reduced from 400°C to 300°C and all other growth conditions were fixed, the Bi concentration in the deposited films increased from 1% to 5% and the photoluminescence (PL) intensity decreased by more than a factor of 1000. This is an indication of the importance of growth temperature in GaAsBi crystal quality. n+/p junctions were grown for the deep level transient spectroscopy (DLTS) experiments in collaboration with Simon Fraser University. The DLTS measurements showed that lowering the GaAsBi growth temperature increases the deep level density by a factor of 10. These deep levels are the source of non-radiative recombination and decrease the PL intensity. The structural properties of GaAsBi were investigated by high resolution x-ray diffraction and polarized PL and revealed long distance atomic arrangement (Cu-Pt ordering) in GaAsBi. The measurements showed that the ordering is more probable at high growth temperature. This can be due to the larger mobility of the atoms on the surface at high growth temperatures that allows them to find the ordered low energy sites. / Graduate

<p>Proper morphogenesis is essential for both form and function of mammalian craniofacial and neural tube development. Craniofacial deformities and neural tube defects are highly prevalent human birth defects. Although studies concerning craniofacial and neural tube development have revealed important genetic and/or environmental factors, understanding the mechanisms underlying proper development and the defects remain incomplete. </p><p>Among many genes that were cloned as the gastrula organizer genes in 1990s, Nog, a secreted BMP antagonist, is expressed in the relevant domains during craniofacial and neural tube development. Previous studies show that Nog null embryos exhibit fully penetrant spina bifida (open spine) and to the lesser extent exencephaly (open brain). Moreover, Nog null mice display deformities in skeletal structures including defects in craniofacial skeleton. As such, Nog is essential for proper neural tube and craniofacial development. However, it is still not clear that which domain(s) of Nog are responsible for proper craniofacial development or neural tube closure. In addition, it is also an important question when, and in what capacity Nog is necessary during development of craniofacial and neural tube.</p> / Dissertation

Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2007. / Mozambique is investing heavily in rehabilitating and upgrading the current roadway infrastructure. Investigation by the Mozambican roads authority found that some consulting engineers and contractors were not familiar with Mozambican conditions and materials. The World Bank sponsored a research project to support the roadway infrastructure preservation and maintenance efforts. The thesis work presented forms an integral part of the work conducted by the World Bank project research team. The objective of the thesis is to characterise cement stabilized sand bases in Mozambique under Accelerated Pavement Testing (APT) in terms of stiffness and deflection responses under load trafficking. This work forms the basis for developing guidelines for a mechanistic-empirical design method for Mozambican conditions and materials. Reported findings from initial MMLS3 testing conducted for the World Bank project were used to scope the full-scale research study and provided guidelines for the selection and construction of full scale test sections on natural subgrade. The APT presented encompass full-scale pavement testing including wet trafficking cycles to emulate environmental effects.