M.Phil. (Sport Management) / Available literature revealed a gap in the body of knowledge regarding the effect of environmental and related factors on the performance of elite under 17 judokas in South Africa in order to address the lack of available research. Scholars increasingly researched the social importance attached to the performance of athletes and the competitive environment, including the role of social agents and simulated training. The aim of this study translates into objectives, namely: i) to describe the sport competition environment through an extensive literature study, ii) to determine the effect of environmental and selected physical factors (sleep and nutrition) on the performance of elite judokas in South Africa in the under 17 age category with a self-designed questionnaire, iii) to determine psychosocial effects on judo performance with the Sport Competition Anxiety Test (SCAT) and the Sports Mental Toughness Questionnaire (SMTQ), iv) to determine the effect of environmental factors, selected physical factors and psychosocial factors on the performance of elite under 17 judokas with a focus group, v) to determine the effect of environmental, psychosocial and selected physical factors on the performance of elite judokas from the perspective of judo coaches by way of interviews, and vi) to conduct a comparative analysis based on various variables such as gender, locality, frequency of competition participation and access to resources. Both qualitative and quantitative data were gathered, constituting an exploratory research design. Questionnaires (SCAT and SMTQ) and qualitative data was gathered by way of interviews with judo coaches (n=8) and a focus group with judokas (n=8). In total sixty five (n=65) judokas participated in this study. A purposive sample of coaches and elite judokas were recruited as research participants. Results indicate that judokas have relatively moderate mental toughness (M=41.66) and that mentally tougher judokas experience relatively less anxiety whilst competing (r=-.48, n=60, p<.01). An increase in anxiety is correlated with a decline in performance and medal winning judokas were relatively more confident than non-medal winners. All research participants were negatively affected by not having adequate exposure to environmental simulated training conditions, with temperature as a main factor impacting on performance.

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This dissertation consists of three essays in the field of applied environmental economics. The first two essays study the effect of daily ambient temperature on police officer behavior. Police officers often exercise substantial discretion when making highly consequential decisions, which can lead to unfair and arbitrary law enforcement. In the first chapter, I exploit daily ambient temperature as a source of transitory, high-frequency shocks and examine how it affects an officer’s decision whether to discount a driver’s speeding penalty in Florida. I find that a 1-standard-deviation increase in temperature lowers the driver’s probability of receiving a lenient ticket by 2%. In addition, using traffic monitoring data and crash reports, I do not find evidence of decreased police effort or increased reckless driving on hot days. I show that the reduction in leniency is disproportionally borne by white drivers, who on average benefit more from officer leniency. In addition, I find that newly hired officers become less affected by temperature as they accumulate more experience on the job. The first chapter shows that daily ambient temperature has a significant effect on police officers’ professional performance. Inspired by this result, in the second chapter I study the effect of temperature on officers’ online expressed sentiment. Mood changes caused by temperature could be a potential mechanism for officers’ behavioral changes observed in the first chapter. To study this question, I obtained messages posted on an online police forum that is popular among Florida police departments. I find that a 1-standard-deviation increase in temperature leads to a 3.5% increase in the use of profanity. In addition, higher temperature has a negative but nonlinear relationship with expressed sentiment. I also find limited evidence of a change in forum activity or discussion topics on relatively hot days, which suggests that these results are likely to be driven by temperature’s effect on officers’ mood. Taken together, the first two chapters highlight the sensitivity of law enforcement behavior to transitory shocks such as environmental conditions. The third chapter, which is joint work with Xinming Du, explores the impact of the 2018 China- U.S. trade war on air pollution in China. Since the Chinese economic data is heavily censored, we take air pollution as a proxy for measuring economic activity. Using city-industry level trade data, we construct a Bartik-style trade war exposure measure for cities in China and compare the pollution trajectory of cities in the top quartile of our measure to those in the bottom quartile under a difference-in-difference design. In addition, to test whether local governments relaxed their enforcement of environmental policies in response to the trade war, we look at whether firms changed their tendency of polluting in the dark during the trade war. Our analysis finds a negative but small and not robust effect of the U.S. tariffs on China’s air quality and no effect of the Chinese retaliatory tariffs. In addition, we find no impact on disguised pollution behaviors of local firms. We conclude that the trade war had minimal effect on China’s economic activity.

The research hypothesis of this study states that when individuals are asked to rank order certain places (environments) in terms of preference, then relationships can be measured between that rank ordering and relevant contextual adjective descriptors that indicate a person's perception of those places. These adjectives include beauty, excitement, distinction, naturalness, security, mystery, tradition, complexity, and familiarity (Canter, 1977; Ganmore, 1975; Ley, 1983; Lynch, 1981; Steele, 1981). After critical sites had been identified in a sketch map study, a sample of community members of the town of Blacksburg, Virginia were asked to respond to the sites along adjective dimensions that represent a sense of place. It was found that positive linear relationships existed in varying degrees of strength between the adjectives and place preference. Statistical significant relationships were found, in descending order of strength, between preference and beauty, excitement, distinction, naturalism, security, and mystery. No linear relationships were found between preference and tradition, complexity and familiarity. It has been concluded that places are perceived on other criteria beside just aesthetic appreciation. Furthermore, this thesis supports the argument that places are experienced on a symbolic and emotional level. Places are not merely a composition of physical elements. This deeper experience is the basis for the concept of a sense of place. / M.L. Arch.

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Plants emit a diverse range of biogenic volatile organic compounds (BVOCs) into the atmosphere, of which isoprene is the most abundantly emitted. Isoprene significantly affects biological and atmospheric processes, but the range of isoprene and BVOCs present in bamboos has not been well characterized. In this thesis I explore the range of isoprene emission found in bamboos and relate it to plant morphological and physiological characteristics. In addition, I measure and relate the entire suite of BVOCs present in the bamboos to their fundamental isoprene emission rate. Interspecific variation in isoprene emission documented in a comprehensive survey of bamboos. Two groups of bamboo species were measured in the greenhouse and the field. Elevated photosynthetic rate was significantly correlated with isoprene emission. In the field, dark respiration rate was highest in bamboos that made the least amount of isoprene. The total BVOC suite was significantly influenced by whether or not leaf-level isoprene emission was present. I conclude that bamboos vary with regard to physiology, morphology, and total BVOC suite and that isoprene emission is correlated with these changes, and introduce the bamboos as a novel system for studying the impacts of isoprene emission.

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Buildings affect people both physically and psychologically, this study analyses this impact which the built environment has on people's lives. This interrelationship between people and the built environment is based on human perception. The study explores this relationship further in order to develop an understanding of the ways in which architecture influences peoples' moods, behaviours and experiences. By determining the importance of this interrelationship and developing a better understanding of it, a deeper analysis of the specialized needs of individuals with altered or impaired perceptions is developed. Focus is placed on individuals with autism spectrum disorders, who are known for their difficulties with perception. In addition, despite its overwhelming prevalence, they have a history of being inadequately catered for within the built environment because their wide range of complex needs are poorly understood. The purpose of this study is to establish an understanding of the unique needs of this particular user group, to interpret the implications of these needs with regards to the built environment, to assess existing facilities in regards to these findings and to provide information which can be used to develop guidelines for creating positive environments which can enhance the daily lives of individuals with autism spectrum disorders. The research was carried out by way of a review of existing relevant literature on the subject of perception, experience and autism spectrum disorders, a review of relevant precedent studies, a critical analysis of relevant case studies and interviews with parents, teachers and principals who have had first-hand experience with individuals with autism spectrum disorders. The built environment, which plays a large role in people's lives, must be carefully considered and designed to ensure that the needs of its users are met and their overall wellbeing is maintained. In contemporary society, where human needs are often ignored, built environments have become ego-driven objects of visual seduction (Pallasmaa, 2005). This study calls for re-humanising architecture, considering human aspects in design and catering for all human needs. By focusing on responding to users particular needs, throughout the design process, buildings which make significant, positive contributions to the lives of individuals can be made. / Thesis (M.Arch.)-University of KwaZulu-Natal, Durban, 2012.

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