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 20 of 65 for “"Dust particles"”.
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TOF-SIMS analyses of interplanetary dust particles
Diese Arbeit ist Teil einer umfassenden Untersuchung von interplanetaren Staubteilchen (IDPs), die in der Stratosphäre gesammelt werden. IDPs können grundlegende Informationen über das frühe und äußere Sonnensystem liefern. Das oberste Ziel ist zunächst eine eindeutige Unterscheidung ihrer …
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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 …
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Exploration of Respirable Dust Particles Sourced From Rock Strata in an Underground Coal Mine
… of regulatory standards for respirable coal mine dust (RCMD) concentration and crystalline silica content, and advancements in mine ventilation and dust controls led to a steady decline of occupational lung disease among US coal miners between the early 1970s and the mid-1990s. Since that time, …
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VEHICLES¿ NON-EXHAUST EMISSIONS: SETUP OF EXPERIMENTAL APPROACHES FOR ON-ROAD CHARACTERIZATION OF TIRE WEAR AND ROAD DUST PARTICLES
… particularly those from tire and road wear particles (TRWPs), have emerged as a dominant and under-investigated source of airborne particulate matter. TRWPs are mechanically generated, chemically complex, and highly variable, posing challenges for both environmental monitoring and regulatory …
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Thermal property of EDS film and its effect on the removal of dust particles as a function of surface temperature
… well suited for solar energy harvesting. High dust concentration in deserts, where many large solar plants are located, causes a loss of energy conversion efficiency by soiling solar collectors. Electrodynamic Screen (EDS) film when laminated over photovoltaic module, works as a self-cleaning …
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Dust in circumstellar disks
… studies of the size and spatial distribution of dust particles in circumstellar disks. Using millimetre interferometric observations of optically thick disks around T Tauri stars, I provide conclusive evidence for the presence of millimetre- to centimetre-sized dust aggregates. These findings …
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Io Revealed in the Jovian Dust Streams
The Jovian dust streams are high-speed bursts of submicron-sized particles traveling in the same direction from a source in the Jovian system. Since their discovery in 1992, they have been observed by three spacecraft: Ulysses, Galileo and Cassini. The source of the Jovian dust streams is dust from …
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A study of dusty plasma environment
… vehicles. One of such environment is the dusty plasma environment, where fine particles can be found in abundance. Dust particles interact with space plasma, get charged and are susceptible to the governing forces, hence are an important hazard to the space mission. This presents a …
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The study of overlapping sheath and dust particle structures in dusty plasma.
Complex (dusty) plasma consists of plasma and dust particles which vary in size from nanometer to millimeter in diameter. Complex plasma exists across many different environments, and can be found in environments from the cosmos to industry. Due to plasma fluxes to its surface, a dust particle …
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Transport and Agglomeration of Dust Contaminant Particles in Reactive Ion Etch Reactors
… contamination. Higher flow rates can sweep dust particles away from sensitive areas of the reactor before they reach the surfaces.
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Synchrotron Based Infrared Microspectroscopy of Carbonaceous Chondrites.
… similar to the average ratio of interplanetary dust particles and Wild 2 cometary dust particles, however significantly exceeds that of interstellar medium objects and several aqueously altered carbonaceous chondrites such as Orgueil. This suggests distinct formation regions and/or parent body …
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A Study of Buried Organics on Mars - A Computational And Experimental Approach
… structures formed through the gradual airfall of dust particles. The computer model devised indicates rapid burial of organics and presents amount of organic carbon preserved at selected locations on Mars after 10 Martian years (99% preserved). The model is further extended globally to point at …
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The role of vortices in the formation of the solar system
… planet formation is understanding how small particles accumulate into larger bodies. Gas vortices are suggested as a mechanism to enhance the coagulation of dust particles in the solar nebula. An inviscid, barotropic, two-dimensional form of the vorticity equation is derived to study the gas …
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Design and implementation of a methodology to characterize indoor visible light communication channels
… environmental conditions, such as introducing dust particles or humidity.
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Charging of aggregate grains in astrophysical environments.
Plasma is a gas in which a portion of particles are ionized. Dust is a ubiquitous component of the universe, and when present in plasma, can form dusty plasma system. Dust in the plasma is generally charged due to the constant collisions with free moving electrons and ions. Cosmic dust can also be …
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The Biogeochemistry of iron, zinc and cobalt in the Atlantic Ocean: the Atlantic Meridional Transect and UK GEOTRACES sections
… by the transport and deposition of atmospheric dust particles. In the North Atlantic, elevated surface dissolved iron concentrations (0.50 - 1.65 nM) were associated with wet and dry deposition of Saharan dust between 4 and 29° N. To the south of 4° N, surface dissolved iron concentrations were …
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Prevalence of knowledge, attitude and practice on pesticides safety among oil palm pesticide handlers in Johor
… made with pesticide residue on plants, soil, and dust particles after spraying.The objective of this study is to assess the level of knowledge, attitudes and practices of pesticide usage among oil palm plantation workers in Johor and to identify the relationship between knowledge, attitude and …
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Filtered Rayleigh Scattering with an Application to Force Component Decomposition
… that makes use of the scattering of light off particles that are much smaller than the wavelength of light that hits them (i.e., Rayleigh scattering of air molecules). The scattered laser light is altered after encountering particles in predictable ways that can be related to changes in …
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Design and Characterization of a Dust Injector for Future Studies of Tungsten Dust in the STOR-M Plasma
Dust generation from Plasma Facing Components (PFC) is a problem for tokamaks as they approach suitable reactor conditions. Tungsten dust is especially detrimental in the core, due to associated high Z bremsstrahlung power losses. As Tungsten is a primary candidate for PFC materials in large …
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