Дисертації з теми "Dust Environmental aspects"
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Yim, Ho-leung Alan, and 嚴可亮. "Unleader petrol and lead in roadside dust: a Hong Kong context." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31253003.
Повний текст джерелаMeskhidze, Nicholas. "Iron mobilization in mineral dust and the possible effect of Asian pollution on C-uptake in North Pacific Ocean." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180333/unrestricted/meskhidze%5fnicholas%5f200312%5fphd.pdf.
Повний текст джерелаHuang, Minjuan. "Risk assessments of human exposure to metal(loid)s via urban dust and airborne particles in Guangzhou, South China." HKBU Institutional Repository, 2013. http://repository.hkbu.edu.hk/etd_ra/1494.
Повний текст джерелаMartin, Paul Craig. "Radiological impact assessment of uranium mining and milling." Thesis, Queensland University of Technology, 2000.
Знайти повний текст джерелаGuenoune, Yanis. "Exposition aux bactéries environnementales dans l’habitat : méthodes de mesure et impacts sur la santé des occupants." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1B061/document.
Повний текст джерелаIndoor air quality is essential for health. Lack of ventilation and presence of humidity in habitats promotes microbial growth. The health effects are multiple and often associated with chronic respiratory diseases, such as asthma. These effects are more or less serious depending on the level of exposure and the vulnerability of occupants and the role of mold is pointed out. However, the lack of valid tools for quantitatively assessing exposure to environmental bacteria is one of the main difficulties in better understanding their impact on human health. An experimental protocol based on cultural techniques was developed and tested in the laboratory to measure the survival of bacteria in domestic dust collected on the ground. The analysis of these dusts made it possible to determine the survival time of the bacteria tested. However, current culture methods are limited and do not provide enough information on the composition of the bacterial flora in the habitat. The use of molecular methods, such as high throughput sequencing, is needed to address this. In addition, domestic dust could be an integrating substrate for chronic occupant exposure. In addition to the development, standardization, and validation of measurement tools, a comprehensive approach to raising awareness and preventing the risk of indoor exposure to contaminants is recommended, particularly for vulnerable populations
Kefeni, Kebede Keterew. "Brominated flame retardant concentrations in office and household dust in South Africa." Thesis, 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000564.
Повний текст джерелаDiscusses polybromobiphenyls (PBBs) and polybromodiphenyl ethers (PBDEs) are among brominated flame retardants commonly used as additive flame retardants and are now well-known pollutants. They can easily be released from household and office materials if present and tend to settle on dust. Of all the PBDEs congeners, the detection of BDE-209 is considerably more difficult than the lower congeners. Furthermore, there is no available data on the presence of PBBs and PBDEs in indoor dust in South Africa, and, therefore, it was deemed necessary to conduct the present study.
Joubert, J. M. (Jacobus Marthinus). "Optimising fall out dust monitoring at a cement manufacturing plant." Thesis, 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000566.
Повний текст джерелаFall out dust sampling and monitoring is becoming one of the preferred methods to determine dust pollution impact from industries/or mines on the receiving environment. Fall out dust monitoring is a useful and cost effective method of providing trend analysis of dust deposition over a period of time. It also provides an indication of the main areas of dust generation and can be conducted for both health and nuisance purposes.The aim of the study was to develop a positioning guideline for fall out dust monitoring equipment in order to optimise the existing fall out dust programme.
Kekana, Mokoko Percy. "Non-occupational exposure to silica dust at ga-Maja village in Polokwane, Limpopo Province." Thesis, 2006. http://hdl.handle.net/10386/1383.
Повний текст джерелаStudies conducted on people who reside next to dust producing mines and industries show major health risks. Air pollutants from the mine and industries are inhaled by exposed miners and people who live in the vicinity (Steenland, 1995). Aim The aim of the study is to investigate non-occupational exposure to silica dust at gaMaja village in Polokwane, Limpopo Province. Methodology Study design For this study a cross sectional descriptive study design was used. Study site The study was conducted at gaMaja village near Polokwane in the Limpopo Province Sampling A total sample of 200 villagers participated in the present study. vi Data Collection Two hundred questionnaires were used to collect survey data and were coupled with four dust deposition gauges. The four gauges were mounted at four different positions in the village and were left for six hours. Data Analysis Questionnaires were analysed using SPSS computer software to determine silica-related illnesses and indicators of exposure to silicosis susceptibility. Dust samples from dust deposition gauges were analysed using a Varian 110 atomic absorption spectrometer for determination of silicon. Results The majority of both male and female participants reported that they do not wheeze (81.4%) or bring out phlegm from their chest (71.4%) as compared to those who reported episodes of cough (48%). Gauges were able to identify exposure to a particular pollutant, silica dust, and were successful.Discussion Data from questionnaires revealed that villagers do not show signs and symptoms related to silicosis, however, that does not rule out infection in a long run. The results from dust samples that were collected reveal that there are traces of silica (crystabolite) in the village of gaMaja. Dust samples were collected during normal production at the mine in the middle of summer. Conclusion Findings from this study show that people residing next to dust producing mines and industries are at high risk of health hazard. Mining companies and policy makers should take note of the findings while planning preventive strategies for reduction of air pollutants.
Aponso, G. Lalith M. "Exposure and health risk assessment for farmers occupationally exposed to chlorpyrifos in Sri Lanka and drinking water and house dust analysis for chlorpyrifos." Thesis, 2001. http://hdl.handle.net/1957/29855.
Повний текст джерелаNkala, Bongani Alphouse. "Toxicological analysis of house dust collected from selected Durban residental buildings." Thesis, 2009. http://hdl.handle.net/10413/7492.
Повний текст джерелаThesis (M.Med.)-University of KwaZulu-Natal, Durban, 2009.
Boling, David Carter. "Dust storm transport of pathogenic microbes to Viking Scandinavia : a query into possible environmental vectors or disease pathogenesis in a closed biological and ecological system." Thesis, 2004. http://hdl.handle.net/1957/28364.
Повний текст джерелаGraduation date: 2005
Kutlaca, Alex (Alexander). "Mechanisms of entry of lead-bearing dusts into houses in Port Pirie." 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phk973.pdf.
Повний текст джерелаKutlaca, Alex (Alexander). "Mechanisms of entry of lead-bearing dusts into houses in Port Pirie / Alex Kutlaca." Thesis, 1998. http://hdl.handle.net/2440/19193.
Повний текст джерелаxxiii, 473 leaves : ill. (chiefly col.), maps (some col.) ; 30 cm.
Research is directed toward demonstrating spatial variability in dust lead contamination patterns both statically and dynamically within the confines of vacant test houses, thus eliciting specific entrance pathways.
Thesis (Ph.D.)--University of Adelaide, Mawson Graduate Centre for Environmental Studies, 1999
Janse, van Rensburg Jacobus Johannes. "Advanced modelling of porous screens in aerodynamic diffusers using variable resistance factors." Thesis, 2014. http://hdl.handle.net/10352/247.
Повний текст джерелаStrict emission legislation has forced industry in general to seriously consider the negative impact it has on the environment, specifically concerning emissions from burning fossil fuel into the atmosphere. In cases where emission levels exceed the allowable limit, companies are forced to operate at lower operating conditions and these load losses can result in a significant loss of revenue. This has forced companies to improve their ash filtering capabilities by optimising electrostatic precipitation systems. One of the main factors impacting on the efficiency of such a system is the distribution of the flow across the collection plates. The design of the inlet diffuser plays a major role in the ultimate distribution of the flow through the precipitator. Porous screens are positioned in the diffuser in order to distribute the flow across the total flow area with the aim to achieve a uniform distribution of the flow. CFD is widely used in industry to simulate the flow through precipitators in order to optimise the flow distribution and thus increase the efficiency of the system. It was found however that the current methods used to simulate these screens in CFD models were not well researched and employed fixed resistance values that could not reliably compensate for changes in the resistance coefficient due to a change in the angle of incidence. This study investigates advanced numerical methods for the simulation of porous screens in applications where the angle of incidence changes continuously across the face of the screen. New methods are introduced where the resistance of the screen is calculated as a function of the changing angle of incidence. The methods currently used are also investigated and compared with results from the new methods. Extensive experimental work was required to supply empirical data for the validation of the numerical methods that are proposed. For this reason, the first part of this study focused on the design construction and commissioning of a low speed wind tunnel. Results are presented and discussed for flow profiles through wide-angle diffusers at different angles and also for a number of different screens positioned in the centre of the diffuser. This study also investigates the sensitivity of a CFD simulation code to factors such as numerical discretisation schemes, turbulence models and solution relaxation specifically for wide-angle diffusers. These factors were tested for diffusers at different angles and included tests on open diffusers and also with screens positioned inside the diffuser. It was concluded that the current methods used are not adequate to capture the true flow profiles for a range of different screen geometries. Although the proposed models did improve on the limitations of the current methods, it was found that the applicability of these models is still limited and that further research would be required to develop numerical methods that are valid for a wide range of applications.
Vaal University of Technology, The National Research Foundation (NRF) and Eskom TSI
Bell, Justin Robert William Civil & Environmental Engineering Faculty of Engineering UNSW. "Cyclic deposition of salt-laden dusts as an explanation of salinisation in a groundwater recharge zone Coleambally irrigation area Riverine plain NSW." 2007. http://handle.unsw.edu.au/1959.4/40549.
Повний текст джерелаMdlozini, George. "A situation analysis and knowledge, attitude and practices (KAP) study of waste management and recycling at the Durban University of Technology (DUT)." Thesis, 2016. http://hdl.handle.net/10321/1631.
Повний текст джерелаThe Durban University of Technology (DUT) signed the Taillores Declaration (TD) in an attempt to deal with environmental issues and subsequently waste management challenges. A few projects have been initiated within the institution to realise the TD ten point action plans. Currently there is limited data regarding the status quo at DUT. A quantitative descriptive study was conducted to analyse the situation with regards to waste management and recycling practices and to evaluate the knowledge, attitude and practices (KAP) of students towards waste management and recycling at DUT. An audit of the refuse receptacles was conducted and information obtained was plotted out on a map of two selected campuses. A questionnaire was used to collect data on the practices of waste management and recycling from nine departments. A total of 403 students from the Indumiso and Riverside campuses of DUT were recruited for the KAP study. The findings revealed that refuse receptacles are provided inconsistently and that there is a lack of planning around the provision of these receptacles. Departmental practices regarding waste management and recycling were found to vary from one department to the next. The KAP study results indicated that the students’ knowledge regarding waste management and recycling is poor and their attitudes and practices towards waste management and recycling may be improved by education and enforcement of policy. It is essential to develop a policy regarding waste management and recycling for DUT. In addition, a learning programme should be implemented for all new students entering DUT and during orientation.
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