M.Ing. / Electrical quality of supply affects every consumer, from the homeowner to large industry and mining. Customer awareness of poor power quality is increasing due to the more sensitive nature of modern equipment. The positioning of a new plant is therefore very important and cannot only be determined by the availability of resources in the area. To determine the quality of the electricity in a certain network, years of historical data is required. To get enough information regarding a distributions network performance would require voltage dip measurements at a few places in the network for at least three years. For this reason a new method are used in this study. By using the existing information in a network, like: • The amount of lightning strikes per year • The amount of electrocuted birds • The type of protection used • The amount of vandalism incidents on a line per year • The tower footing resistance • The fault level in the network The fuzzy logic principle can be used to determine how susceptible a network is to voltage dips, by determining the favourable and unfavourable conditions for a number of membership functions. Conventional set theory (Boolean) states that an element is either a member of a set or not. Fuzzy logic is an extension of conventional set theory enabling an element to belong to a set degree. This study will look at all the important factors influencing voltage dips, and to use these factors in a fuzzy logic program to determine the voltage dip risk factor for new customers setting up plant in a specific network. The voltage dip risk factor will then determine if it is cost effective for a customer to take on the additional cost in dip proofing his plant.

Philosophiae Doctor - PhD (Biotechnology) / The major aim of this study is to determine and compare the distribution of bacteria and actinobacteria in Marion Island terrestrial habitats. / South Africa

This study was about the reaction of disadvantaged groups and persons to inequality and deprivation. Set in Badia, a low income community in Lagos, Nigeria, it investigates the main effects of community members’ attributions of causes of poverty in motivating or impeding their reaction to inequality. Relative Deprivation (RD) theory proposed that dissatisfaction with social outcomes depend on subjective feelings rather than objective criteria. However scholars found empirical difficulties in predicting collective action on the basis of RD. Resource Mobilization proponents argued on the contrary that feelings are not salient within the framework of action. The infusion of Social Identity Theory (SIT) into RD research however resolved the paradox of action with SIT’s argument that action was contingent upon the perception of permeability and legitimacy of inter-group structures. However, despite successes of SIT, scholars found that it was unable to predict the type of actions group members will take in response to injustice and the nature of possible actions. Propositions of RD and SIT were therefore suitable for integration into the proposition of Taylor & McKirnan’s (1984) Five Stage Model (FSM) of inter-group relations that reactions to RD feelings were predicated upon the dynamics of the social philosophy guiding stratification. Using an integrated RD, SIT and FSM framework, this study shows how disadvantaged group members’ responses to deprivation proceeded as predicted by the FSM from mutual acceptance to collective action mediated by their perception of causes of poverty. This complements the trend in the literature on reaction to inequality and it's almost ii exclusive focus on instrumental and affective concerns while neglecting the role of consensually shared beliefs in motivating or impeding action and willingness to act in response to injustice. The study hypothesized that the pattern of causal attributions of poverty of respondents will shape their ‘predisposition to act’ and the type of action they would engage in. The main hypothesis of the study therefore was that poverty attribution mediates the relationship between ‘feelings of injustice’ and ‘reaction to inequality’. For instance where respondents attribute poverty to individual or fatalistic factors they will adopt individual action whereas where attributions are structural, responses will be collective, where feelings of injustice were present. A survey was conducted using a five-level Likert scale to decipher respondents’ perceptions of feelings of injustice, their causal attribution of poverty, their levels of willingness to embark on collective action and actions taken in the preceding year. In the first stage of analysis, responses (n = 383) were reduced using Principal Components Analysis (PCA) to determine how questionnaire items contributed to variables under consideration. Subsequently, variables extracted were correlated and regressed. While bivariate correlation was used to test simple relationships between variables, a stepwise hierarchical regression analysis was used to decipher how sub-dimensions of poverty attribution mediate the relationship between respondents’ feelings of injustice and their willingness to embark on collective action entering variables in succession into the regression equation. Furthermore, a 1 x 3 x 5 Multivariate Analysis of Covariance (MANCOVA) was used to test the mediation effects of poverty attribution sub-dimensions on the relationship between injustice feelings and actions. The results showed iii that structural attribution was the preferred explanation for poverty among Badia residents, as this explanation was preferred by a majority of the respondents. It was also shown that while 96.9% of respondents used more than one causal attribution, a majority of structural attributors adopted fatalistic attribution as second choice of explanation for poverty. On the basis of the above, and in line with previous studies (Mann, 1970; Bobo, 1991), it was deduced that the possibility for radical action would be diminished as a result of this ‘dual/split consciousness’. The result further confirmed as hypothesized, that fatalistic attribution had a negative correlation with willingness to embark on collective action as respondents in the fatalistic condition were not willing to embark on collective action. However, respondents in the structural conditions were more willing to engage in collective action. While attributions predicted willingness to embark on collective action, MANCOVA showed that action proceeded in a continuum as predicted by the FSM. For example, while the introduction of fatalistic and individual attribution to the equation hypothesizing the relationship between injustice feelings and action showed that resultant actions were predominantly individual normative, post-hoc inclusion of the structural dimension to the equation showed an addition variance to the equation for collective action. This indicated that structural attributions enhance collective normative action. However, consistent with most studies in the literature, the results did not predict collective non-normative action1. Results indicated low adherence of subject to items eliciting collective action suggesting that past studies which reported high preference of collective action by disadvantaged groups may have been influenced by ‘social desirability effects’, given Topf’s (1995) assertion that what people say they will do is often not what they do but what they perceive as right in the particular situation. 1 The only notable exception is Boen & Vanbeselaere (1998) 2 A full discussion of lay explanations of poverty is reserved for chapter 4 of this thesis. iv The study however proposed on the basis of the salience of structural attributions that poverty attributions may become useful for Social Movement Organizations (SMOs) interested in fostering social change. However, while the study showed that attribution influences willingness to embark on action it does not show how attribution becomes salient in group membership. Thus there is a need for future studies to investigate how attribution affects group identification. Similarly, given the dearth of studies of the attribution of the ‘actual poor’ of poverty, it is necessary for future studies to test the validity of the result from the present study indicating stronger adherence to fatalistic than individualistic attributions of poverty among the disadvantaged. While many past studies of attribution and those of reaction to injustice have been on samples of middle-class adults in developed countries, or artificially created deprived groups, the present study being of the ‘real life’ poor in a Third World setting, provides evidence of ‘real world’ actions and attributions of people experiencing poverty.

The source of information for contemporary as well as future implementers of the distribution centre. Process of a strategic choice, over the decision whether to pursue an own or external distribution centre, an building proposal itself to the final implementation and operation. The key words - distribution, project, outsourcing, development, storage technologies, handling equipment, automatic identification, layout.

The existing inequality indexes in the economics literature (including the more sophisticated indexes of Muellbauer (1974) and Jorgenson-Slesnick (1984)), are found to be insensitive to relative price changes or are unjustifiable in terms of social evaluation ethics or both. The present research fills this gap in the literature by proposing a new index, named the Individual Equivalent Income (IEI) index. A household indirect utility function is hypothesized which incorporates certain attribute parameters in the form of equivalence scales. These attributes are demographic and environmental characteristics specific to a given household. This indirect utility function gives a number which represents the utility of each member of the household. A particular level of interpersonal comparison of utilities is assumed which gives rise to an exact individual utility indicator named equivalent income. A distribution of these equivalent incomes forms the basis of a price-sensitive relative inequality index. This index can be implemented in the Canadian context. Preferences are assumed to be nonhomothetic translog and demand data are derived from cross-section surveys and time-series aggregates. Based on demand data, the translog equivalent income function can be estimated and equivalent incomes imputed to all individuals in society. An Atkinson index of equivalent incomes is then computed to indicate the actual degree of inequality in Canada. The new IEI index is compared with other indexes based on a common data set. The main findings are: conventional indexes give bad estimates of the true extent of inequality and the IEI index, while providing a more accurate estimate, indicates distributive price impact in a predictable manner, i.e., food price inflation aggravates while transportation price inflation ameliorates the inequality problem. / Arts, Faculty of / Vancouver School of Economics / Graduate

The aim of this thesis is to investigate the existing pattern and changing trend of the distribution of wealth in today's Canada. In doing so I explore both theoretical accounts and empirical evidence. First, the theoretical perspectives of both classical (Marx, Durkheim, and Weber) and contemporary (Blumberg, Westergaard and Resler, Porter, and Clement) social thinkers were discussed. The objective of this review was to describe the sociological interpretations and explanations of the distribution of wealth. Second, existing evidence was reviewed and new data was gathered on the wealth distribution in Canada. The existing data came from Osberg, Hunter, Vaillancourt, Rashid, and Oja. New data concerning such issues as welfare state, income disparity, and important wealth components was examined to augment the previously existing data. The Canadian wealth distribution proved to be unequal and to have become slightly more unequal over time. The concluding chapter briefly reviews possible explanations for this set of findings. / Arts, Faculty of / Anthropology, Department of / Graduate

As a byproduct of incomplete combustion, soot attracts increasing attentions as extensive researches exploring serious health and environmental effects from soot particles. Soot emission reduction requires a comprehensive understanding of the mechanism for polycyclic aromatic hydrocarbons and of soot formation and aging processes. Therefore, advanced experimental techniques and numerical simulations have been conducted to investigate this procedure. In order to investigate the effects of dimethyl ether (DME) mixing on soot particle size distribution functions (PSDFs), DME was mixed in premixed ethylene/oxygen/argon at flames at the equivalence ratio of 2.0 with a range of mixing ratio from 0% to 30% of the total carbon fed. Two series of atmospheric pressure flames were tested in which cold gas velocity was varied to obtain different flame temperatures. The evolution of PSDFs along the centerline of the flame was determined by burner stabilized stagnation probe and scanning mobility particle sizer (SMPS) techniques, yielding the PSDFs for various separation distances above the burner surface. Meanwhile, the flame temperature profiles were carefully measured by a thermocouple and the comparison to that of simulated laminar premixed burner-stabilized stagnation flame was satisfactory. Additionally, to understand the chemical role of DME mixing in soot properties, characterization measurements were conducted on soot samples using thermo-gravimetric analysis (TGA) and elemental analysis (EA). Results of the evolution of PSDFs and soot volume fraction showed that adding DME into ethylene flame could reduce soot yield significantly. The addition of DME led to the decrease of both the soot nucleation rate and the particle mass growth rate. To explain the possible mechanism for the observation, numerical simulations were performed. Although DME addition resulted in the slight increase of methyl radicals from pyrolysis, the decrease in acetylene and propargyl radicals inhibited the production of polycyclic aromatic hydrocarbons. At the same time, the addition of DME gave rise to the increase of the flame temperatures, which favored the production of OH radicals. The incremental concentration of OH radicals promoted the oxidation rate of soot particles. Additionally, soot samples from flames with higher DME mixing ratios showed higher O/C, H/C mass ratios and thus better oxidation characteristics. In summary, the addition of DME reduces soot emission in two ways: on the one hand, it inhibits soot nucleation and mass/size growth, then the production of soot particles decreases; on the other hand, it promotes soot oxidation process by increasing the concentration of OH radicals and improving the oxidation behavior of the soot particles, then more particles are oxidized. Both of them are responsible for the reduction of soot emissions at the presence of DME.

Order picking is an essential part of order processing in warehousing and distribution operations and can be performed using manual, automated, or semi-automated systems. This thesis analyzes two automated systems, which include carousel and AS/RS (automated storage and retrieval system). The main goal of this research is to develop mathematical models to compare the performance of both systems under random and class-based storage assignments. Simulation models are used to validate the reliability of mathematical models. The outputs of mathematical and simulation models are consistent indicating carousel system with class-based assignment has the highest throughput. Economic analysis is used to estimate the payback periods required to convert from manual to AS/RS and carousel systems. The economic analysis shows that converting from manual to AS/RS with class-based assignment has the shortest payback period.

La mise en place d'objectifs de conservation adéquats repose sur la définition d'états de référence appropriés pour la distribution et l'abondance des espèces. Cependant, l'étendue des impacts cumulés de l'homme sur les écosystèmes est aujourd'hui largement sous-estimée. Dans ce projet, je m'intéresse aux opportunités qu'offre l'utilisation de données historiques combinées à différentes méthodes analytiques pour définir ces états de référence ainsi qu'aux défis posés par ce type d'approche. Des données de présence ont été recueillies pour sept espèces de cétacés et trois espèces de pinnipèdes à partir de sources archéologiques, historiques et industrielles, révélant des réductions dans la distribution et l'abondance des espèces depuis la préhistoire à nos jours. Des modèles de distribution d'espèces ont été développés pour cinq espèces de cétacés, combinant des données de chasse baleinière du 19ème siècle à des variables environnementales afin d'estimer la distribution historique des espèces avant qu'elles n'aient été chassées. J'ai obtenu pour la baleine franche de l'Atlantique Nord (Eubalena glacialis) une estimation détaillée de sa distribution et de son abondance avant qu'elle ne soit exploitée, en extrapolant des connaissances sur la distribution et l'abondance d'une espèce congénérique, la baleine franche du Pacifique Nord (E. japonica). Ces résultats suggèrent que la baleine franche de l'Atlantique Nord occupe une portion réduite de sa distribution historique, et que son abondance actuelle ne représente qu'une infime portion (<5%) de son abondance passée. Plus généralement, ces résultats soulignent l'importance de considérer des données historiques pour comprendre le niveau d'impact par l'homme sur les espèces, évaluer leur niveau de déplétion et renseigner leur potentiel de rétablissement dans l'avenir. / Relevant baselines on the historical distribution and abundance of species are needed to support appropriate conservation targets for depleted species, but the full scale of cumulative human impacts on ecosystems is highly underestimated. In this project, I investigated the challenges and opportunities of combining historical data with analytical methods to improve these historical baselines. Occurrence data from archaeological, historical and industrial sources were reviewed for seven cetacean and three pinniped species, revealing range contractions and population depletions from prehistorical times to today. For five whale species, I used species distribution modelling to combine 19th Century whaling records with environmental data, to estimate pre-whaling distributions. For the highly depleted North Atlantic right whale, (Eubalaena glacialis), I obtained a detailed estimate of pre-whaling distribution and abundance by inferring from the historical distribution and abundance of its congeneric North Pacific right whale (E. japonica). These results suggest that the North Atlantic right whale occupies a small fraction of its historical range and that its current population represents <5% of its historical abundance, with implications for the management, monitoring and conservation targets of this species. More generally, these results emphasize the utility of considering historical data to understand the extent to which species have been impacted by humans, assess their current level of depletion, and inform the options available for their future recovery.

MENVSC / Department of Geography and Geo-Information Sciences / Many South African nature reserves, like the Kruger National Park (KNP) suffer from monthly below average rainfall that puts pressure in the diversity of wildlife animals in the park. Very little attention has been given to the behaviour of zebra population during period of low rainfall in KNP. Hence, this thesis seeks to examine the role of rainfall in the distribution of burchell’s zebra population from 1983 to 2012. Previous work has failed to explain the abundance of zebras in areas of low rainfall resulting from a long period of no rainfall in the area. Readily available data on rainfall and zebra population distribution was acquired from the KNP. The semi-logarithmic model was also proposed to estimate the probability of rainfall in the Kruger National Park. Three periods of low rainfall period were estimated from the graph and the years were further used to make comparison of how zebra behaves during periods when rainfall is low, medium or highest. GIS tools (spline and kernel) were used to analyse the trend between the years of zebras in relation to rainfall availability in Kruger National Park and a map was created with these tools. The study was based on a hypothesis that there exist a relationship between rainfall and the zebra population. The study advances our understanding of what determines the movement of burchell’s zebra in the park. The findings from the research show that the impact of rainfall on zebra distribution is more complex than previously assumed. The findings based on mapping were able to indicate that rainfall variability does not influence the distribution of zebra, rather more zebras were found in areas with sparse vegetation and avoid dense vegetation as much as possible. / NRF