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 31 for “"Dust emission"”.
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Measurement of Magnetic Fields From Linear Polarization of Dust Emission
… the time variability of polarized SiO maser emission (RLeo, Orion IRc2) and studying the linear polarization of quasars.
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Lower Kuiseb River sediments and their control on dust emission
… identified the Kuiseb River in Namibia as the dustiest river in Southern Africa. Dust plumes detected from this basin are mostly associated with the Lower Kuiseb River, between the end of the bedrock canyon at Natab and the Kuiseb Delta towards the Atlantic Ocean. The purpose of this study was …
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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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Environmental change and soil organic carbon storage in a dust emission hotspot, Free State, South Africa
… management practices which may contribute to dust emissions and soil loss, a common symptom of land degradation. The goal of this study was to establish how the shift in land cover or land use change affects the occurrence of dust and determine the climate constraints and mitigations to crop …
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Star formation in the HII regions RCW 38, RCW 36, and RCW 108
… and RCW 108 which reveal the distributions of dust associated with the three regions. The dust emission in RCW 38 exhibits a ring like structure centered around an O-star. A bright knot in the ring was determined to contain 15% of the total dust by mass in the region and roughly coincided with …
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Integrating Sub-Centimeter Resolution Photogrammetry with a Surface Roughness Correction Factor Applied to PI-SWERL Measurements
… technique used to quantify surface roughness for dust emission measurements. Chapter 1 begins with a literature review that documents the significance of research pertaining to dust emission. It then presents a summary of the development of the Portable In-situ Wind Erosion Laboratory (i.e., …
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Magnetic Fields in Star Forming Regions: Interferometric Mapping and Modeling
… a code to model and observe the polarized dust emission from arbitrary magnetic field configurations in star forming regions. We found that the interferometric observation will strongly overestimate the fractional polarization under most cases; however, we found that the position angle is …
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Dust in Early-Type Galaxies using Herschel-ATLAS and GAMA data
… elliptical and lenticulars) containing thermal dust emission, with aims of linking the formation and evolution of these galaxies with their current dust properties. Three different proxies for morphology are considered for selecting ETGs, and these are tested against three sets of visually …
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The G332 Molecular Cloud
… to be ∼ 3.7 kpc from the Sun. The ring exhibits emission with broadly similar morphology in the emission lines of CO and the [CI] 3P2 →3 P1 line transition at 809.342 GHz, as well as in far-IR dust emission. The dark molecular gas fraction — estimated from the 13CO and [CI] line emission — is ∼ …
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The kinematic and thermal Sunyaev-Zel'dovich effects as probes of cosmology and astrophysics
… between the tSZ signature and extragalactic dust emission. I test the measurement pipeline with a catalogue of galaxy clusters, finding the expected high-significance tSZ detection together with correlated dust emission. I then measure the tSZ signal of spectroscopically confirmed …
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Spitzer's Contribution to the AGN Population
… as AGN candidates those objects whose radio emission is significantly brighter, relative to the mid-IR, than would be predicted by the well known radio/infrared correlation, indicating that the radio emission originates in the central engine. We find that of the 27 such sources identified in …
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OBSERVATIONAL CONSTRAINTS OF THE INTERACTION BETWEEN PLANETS AND PROTOPLANETARY DISKS
… extended disks with noticeable substructures in dust emission to a disk surrounding a very low-mass star that may have undergone giant planet formation, as well as a compact, structureless disk exhibiting a peculiar behavior whose origin remains uncertain. The methodologies employed in these …
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Silicosis among Cape gemstone workers : tigers' eye pneumoconiosis
… particularly in small, poorly regulated industries. A case series is described of six workers who developed silicosis whilst involved in the processing of semi-precious gem stones. They had been employed as stone sculptors in lapidaries where they processed tigers' eye, rose quartz, …
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Bayesian modeling of microwave foregrounds
… contamination (synchrotron, free-free, dust emission) from the interstellar medium in our own Galaxy and others that masks the CMB signal. Recent developments in modeling techniques may provide a better understanding of these foregrounds and allow improved constraints on current …
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Design of a primary off-gas scrubber for a ferro-manganese electric arc furnace process
… with the change in power input, however the dust load in the off-gas stream changes exponentially. Larger particulate is generated with the increase in power, as well as the total mass of dust per cubic meter of gas. The dust loading of the off-gas plays a critical role in the design of an …
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Multi-Scale Atmospheric Dynamics of Extreme Saharan Dust Storms Resulting in Dust Transport Out of Africa to Iberia and the Atlantic
… meteorological processes that organize Saharan dust plumes and their subsequent long-range transport is a major global concern. However, the state-of-the-science of the meteorological forcing mechanisms for dust emission over the complex terrain of North Africa is incomplete due to very few …
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Outflows and Dust in Quasars
… to explain the observed strength of emission, and thus arise from the inner parts of the broad line region. The strength of this emission is shown to correlate with the outflow properties. Second, I develop an SED model capable of reproducing the median observed photometric colours in …
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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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Probing the Role Played by Magnetic Fields in Star Formation with BLASTPol
… measures linearly polarized Galactic dust emission in order to map magnetic field morphology in nearby molecular clouds. The role played by magnetic fields in providing support against gravitational collapse of clouds and cores and in forming observed cloud morphology is a key …
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A multi-molecular line study of an entire giant molecular cloud
… differences among CS, HCO+, HNC and C2H line emissions, suggesting these four molecules are `well-mixed' on large scale, possibly by turbulence. PCA of the integrated emission maps separates molecules into low (13CO and C18O) and high (the rest) density tracers, identifies anti-correlation …
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