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 77 for “"Haze"”.
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Haze measurements through image analysis
… the recent years, Singapore has been affected by haze caused by slash-and-bum fires in Indonesia. Currently, haze concentration is measured by filtering air samples at various stations in Singapore. In this thesis, optical approaches to haze measurements are explored. Images of haze were taken in …
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An investigation of the primary sources of the Cape Town brown haze
The term atmospheric haze is a condition of reduced visibility, caused by the presence of fine particulate matter in the atmosphere, which can originate from natural or anthropogenic sources. The "Brown Haze" is a phenomenon that is associated with Cape Town and can be described as brown coloured …
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Fine particulate matter source apportionment of the brown haze in Cape Town
"Brown Haze" is a term used to describe a brown-coloured smog found predominantly in the wintertime in the Cape Town region. It occurs. mostly from April to September due to strong) temperature inversions and windless conditions that can occur during these months, which lead to the build-up of …
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Effects of Transparency and Haze on Trust and Performance During a Full Motion Video Analysis Task
… of varying levels of transparency and image haze on task performance and user trust in automation. A new model predicting trust from attention was also proposed. A secondary aim was to investigate the usefulness of task shedding and accuracy as measures of trust. A group of 48 undergraduates …
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Haze in the Headlines: Definitional Struggle and the Social Construction of Canada's Vape Mediascape
A 2023 CBC article reports that teen vaping rates in Canada are among the highest in the world (Miller, 2023). While it presents a health risk to youth, particularly non-smokers, vaping is viewed as a better alternative for those struggling with tobacco and nicotine addiction and can be seen as an …
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AN ANALYSIS OF LONGITUDE VARIATIONS IN THE EQUATORIAL SPECTRUM OF SATURN
… with reflecting layer at 2.1 bars, an extended haze to 170 mb and an overlying thin stratospheric haze is adopted. Two sets of data are analyzed, a set of ground based observations covering the 6000-6600 A spectral region and a set of Voyager 1 images obtained with the orange and methane …
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Local variation and regional transport of tropospheric ozone over Cape Town
… April and September, during episodes of brown haze. When this haze occurs, it appears in the morning as a layer of concentrated pollution, likely to be associated with photochemical pollutants such as tropospheric ozone (O3) and some of its precursors. Previous studies have identified local …
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Millimeter Through Visible Frequency Waves Through Aerosols: Particle Modeling, Reflectivity and Attenuation
… problem of modeling atmospheric aerosol (such as haze and fog) particle-size distributions in order to predict the effects (such as attenuation and reflectivity) that these particles have upon the propagation of electromagnetic waves of micrometer range wavelengths. Specifically, an inversely …
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Assessing PM2.5 pollution and the role of transboundary pollution emissions across Greater Kuala Lumpur, Malaysia from 2018 to 2023
Transboundary haze events in Southeast Asia have been associated with elevated PM2.5 levels in Greater Kuala Lumpur (GKL), Malaysia. PM2.5 refers to fine particulate matter with an aerodynamic diameter of 2.5 microns or less, capable of penetrating deep into the respiratory system and posing …
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Study of the Morphology and Optical Properties of Propylene/Ethylene Copolymer Films
… change in the spherulite birefringence. The bulk haze, clarity, and transparency of a homopolymer film were degraded through annealing treatments, which decreased the fraction of gamma-phase crystallinity and increased the thickness of existing lamellae, resulting in an increased intensity of …
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Outage prediction modelling of terrestrial free space optics for tropical region
… different meteorological conditions such as fog, haze, snow and rain. In tropical regions like Malaysia, haze and rain are the most common impairment factors to FSO links. These weather conditions limit the visibility, causing high attenuation to the optical signal. This study evaluated the …
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Mechanical handling effects on brewers' yeast
… have been reported as a result of excessive haze production caused by the action of centrifuges (Lim et al., 1992; Siebert et al., 1987). Mannan haze material has also been shown to result from the agitation of yeast slurries in baffled shake flasks (Lewis and Poerwantaro, 1991). The …
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Visibility in Hercules Glades Wilderness, Taney County, Missouri: a Study of Baseline Conditions
… Hercules Glades suffers from uniform/regional haze 59 percent of the time, and standard visual range (SVR) decreased each year from 1991 to 1993. The winter seasons have the lowest percentage of uniform haze and the greatest SVRs, while the summer seasons typically have the lowest SVRs. Human …
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Supramolecular polymer additives to improve the crystallization behavior and optical properties of polybutylene terephthalate and polyamides
… improve the optical properties (clarity and haze). This thesis describes the use of supramolecular nucleating agents to increase the polymer crystallization behavior and to improve the optical properties of polybutylene terephthalate and polyamides. In the first chapter the influence of the …
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The transport of pollutants over South Africa and atmospheric sulphur in Cape Town
… unpleasant pollution (called the Brown Haze) in winter. Sulphur is a major constituent of this haze. To reduce sulphur pollution, and its negative impact on health in Cape Town, air quality management has focussed on identifying local sources and reducing the local emissions of sulphur. …
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Reconstruction Enhancements with Optical Scanning Holography
… sections without artifacts such as out-of-focus haze from adjacent sections has been the focus of much work including algorithms, optical techniques, and combinations of the two. This dissertation presents several different techniques for enhancing the reconstruction of a recorded specimen and …
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I. Persistent radicals for dynamic nuclear polarization : II. Synthesis of substituted indoles
Part I: An brief introduction to dynamic nuclear polarization (DNP) is provided including a discussion of polarization mechanisms and development of new polarization methods in a historical context. Efficient synthesis of highly water-soluble BDPA derivatives that preserve the desirable DNP …
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CONFRONTO DEI RISULTATI VISIVI E TOPOGRAFICI IN PAZIENTI CON CHERATOCONO SOTTOPOSTI A CROSS-LINKING CORNEALE: TECNICA TRADIZIONALE Vs TRANSEPITELIALE
… 2 D e aumento visus di 3/10. Complicanze: 4 casi haze transitorio a 2 mesi risolto con steroidi topici. 36 con CCL transepiteliale, incremento visus di 5/10 e riduzione Kmax di 4 D e no complicanze significative. Conclusioni.CCL transepiteliale migliore di quello standard (riduzione Kmax e aumento …
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Astrochemical dynamics: Fundamental studies relevant to titan's atmosphere
… mechanisms of unsaturated hydrocarbon molecules, haze layers and aerosols in Titan's upper atmosphere. In the diacetylene dimer, it is shown, via laboratory studies combined with electronic structure calculations that the photodissociation of the dimer readily initiates atomic hydrogen (H) loss …
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