Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Dust sources"”.
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Characterising South Africa’s major dust sources
… study investigates the surface controls of major dust emissions and determines the patial distribution of major dust source in South Africa. This study follows a multi-disciplinary approach where primary and secondary data were used. The main objective of the study is to determine the spatial …
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Comparison of three dust sources in Iceland: Dyngjusandur, Mýrdalssandur and Sandkluftavatn
Dust, a growing concern due to its impact on ecosystems and human health, has prompted increased research and awareness. This study focuses on dust source activity in Iceland, specifically in Dyngjusandur, Mýrdalssandur, and Sandkluftavatn. These locations are known as "hot spots" for dust events. …
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Southern African dust sources as identified by multiple space borne sensors
… of source areas and the trajectories of dust around the globe. This study focuses on the dryland regions of Botswana, Namibia and South Africa. It uses the capabilities of the ultraviolet channels provided by the older Total Ozone Mapping Spectrometer (TOMS), the Ozone Monitoring …
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Effects of Dust Controls and Dust Sources on Respirable Coal Mine Dust Characteristics
Respirable coal mine dust (RCMD) continues to pose serious health hazards to workers. Over the past few decades, new regulations, monitoring technologies, and improved dust controls have emerged, and all are based on the presumption that limiting RCMD on the basis of mass will effectively mitigate …
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Evaluating different remote sensing techniques for detection of Saharan dust and characterisation of dust sources
Mineral dust aerosols play an important role in climate and the Earth's energy budget. However, the nature and complexity of dust sources is poorly understood. Traditional techniques used for mapping the Sahara dust sources like the analysis of surface dust observations, back trajectory analysis of …
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Analysis of contributions to the PM10 concentration in a gold mine residential village
… the inclusion of non-identified or “unknown” sources, allocation of the impact at the receptor point to the identified sources proved possible and useful in comparing individual tailings dams contributions. The No. 4 tailings dam has been identified as one of the major contributors to PM10 …
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Reconstructing atmospheric changes in Monsoon regions using eolian dust
Mineral dust is generated in continental interiors and exported by winds to ocean basins, providing a sedimentary archive which is one of the few direct indicators we have of atmospheric circulation in the past. This archive can be utilized in regions of dust transport also affected by monsoons to …
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Quantifying Sphagnum spp. presence and distribution along a gradient in aeolian mineral deposition in Icelandic mires
Aeolian dust deposition has been shown to affect natural ecosystems in different ways, for instance by increasing soil’s bulk density and mineral content, leading to shifts in vegetation. Due to Iceland frequent volcanic eruptions and vast sandy deserts and eroded areas, in combination with strong …
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Definizione di una metodologia integrata per la stima delle emissioni di PM da superfici di materiali granulari esposte all’erosione eolica
… matter (PM) from granular surfaces (industrial wind erosion). In industrial environments such as mining and metallurgical plants, granular materials, typically stored in open yards, can act as fugitive dust sources and affect air quality in surrounding environments. This work develops …
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Aeolian dust emission dynamics across spatial scales: landforms, controls and characteristics
… factors (meteorological conditions) result in dust emission dynamics being complex in both space and time. Accounting for localscale surface variability is critical to our understanding of dust emitting processes. This study identifies mineral dust using remote sensing, establishes emission …
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The nature of pan sediments: A case study on dust supply from the Makgadikgadi pans, Botswana
Understanding dust sources is essential, as aerosols from arid basins have widespread effects on atmospheric, biological and terrestrial processes on regional to global scales. This thesis presents the results of chemical and morphological analysis for sediments from Sua Pan, Botswana, which forms …
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The biogeochemistry of marine particulate trace metals
… Inputs of lithogenic particles from African dust sources, hydrothermal systems, benthic nepheloid layers and laterally-sourced margin influences are observed and discussed. Lithogenic particle residence times, size-fractionation patterns, Ti-mineral speciation, and relationships to biological …
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Interactions Between Dust and Ecosystem, and Landscape at Multiple Scales
Atmospheric dust is the largest contributor to global aerosols from land. Dust emissions rate and properties are influenced by meteorological conditions, parent soil, and landscape, and in turn, it affects impacts on climate, ecosystems, and human societies through various pathways. This …
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Application of a TGA Method to Estimate Coal, Carbonate, and Non-carbonate Mineral Fractions as a Proxy for the Major Sources of Respirable Coal Mine Dust
Inhalation of respirable dust in coal mines is a serious occupational health hazard which can lead to the development of chronic and irreversible lung diseases, such as Coal Worker's Pneumoconiosis (CWP) and Progressive Massive fibrosis (PMF). After the passage of the Federal Coal Mine Health and …
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Variability, origin and physical characteristics of dust aerosol in Iceland
Emissions of particulate matter from the natural sources account for a significant part of the total particulate air pollution. Less industrialized and inhibited regions, such as deserts, can contribute remarkably to air pollution. Iceland is a good example of such areas. The trends in long-term …
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Demonstration of Optical Microscopy and Image Processing to Classify Respirable Coal Mine Dust Particles
Inhalation of respirable coal mine dust (RCMD) can lead to chronic lung diseases, including coal worker’s pneumoconiosis (CWP) and more severe forms such as progressive massive fibrosis. After the Federal Coal Mine Health and Safety Act was passed in 1969, limits on exposure to respirable dust were …