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 188 for “"atmospheric conditions"”.
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HYPERsensarium : an archive of atmospheric conditions
… this thesis seeks to re-expose the body to conditions society has disengaged itself with both physically and socially. Despite scientific data showing rising surface temperatures, increasing carbon dioxide levels, rising sea levels and extreme weather occurrences, environmental issues occur …
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A DOAS Study on the Oxidation Mechanism of Aromatic Hydrocarbons under Simulated Atmospheric Conditions
Das Ziel dieser Arbeit war es das Verständnis der OH-Radikal initiierten Oxidation aromatischer Kohlenwasserstoffe (Benzol, Toluol, p-Xylol (BTX) und 1,3,5-Trimethylbenzol (TMB)) zu verbessern. Diese Mechanismen gelten als Hauptunsicherheitsfaktoren in Chemie-Modellen zur Erfassung der …
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Fluorinated Graphene Oxide Based Chemiresistive Gas Sensor Targeting NH3 and Other Analytes Under Atmospheric Conditions
Emergence of graphene-derived highly functional materials has transformed chemical and biological sensing. Several novel approaches utilizing chemical modification of graphene oxide (GO) were investigated and implemented using these materials in sensor fabrication for the detection of chemical …
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Synoptic-Scale Atmospheric Conditions Associated with Flash Drought Initiation in Puerto Rico and the Caribbean
… research seeks to understand the synoptic scale atmospheric drivers of flash drought events. Recent occurrences of a flash drought event in this region include the 2015 event in Puerto Rico, which resulted in water rationing and shortages for residents of the island (Mote et al., 2017). The …
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Characteristics of extreme wave events and the correlation between atmospheric conditions along the South African coast
Characteristics of extreme wave events along the coast of South Africa were researched through a dataset obtained by CSIR wave recording network at four locations. The locations from west to east are Slangkop, FA-Platform (Agulhas bank), East London and Richards Bay. The longest dataset available …
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Role of multiscale atmospheric conditions in the evolution of convective organization during MJO-1 of DYNAMO/CINDY/AMIE
… ERA-interim reanalysis data shows the multiscale atmospheric conditions and changes in convective organization during a central Indian Ocean Madden-Julian Oscillation (MJO) event observed by the DYNAMO/CINDY/AMIE field campaigns in October 2011. Shifts in reflectivity and dual-polarization …
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Simulating the use of channel reciprocity in laser communication system operations to improve quality of service through varying atmospheric conditions
… or interleaving to mitigate the effects of atmospheric turbulence. This model was implemented in MATLAB* and Simulink*. The second task integrated the model with a graphical user interface (GUI), which provides the user a choice of different configurations and solutions based on the user's …
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Survival of Escherichia coli O157:H7 on cut and whole surfaces of spinach and leaf lettuce, packaged under modified atmospheric conditions
… and spinach. Samples were held under normal atmospheric conditions or in a modified atmosphere package at either 4ºC or 10ºC to simulate display and abuse temperatures. Leaves were sampled at Days 0, 1 and every other day until visual spoilage occurred (7 days for lettuce, 9 days for …
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A discrete forward-modeling method for characterizing occultation lightcurves of tenuous planetary atmospheres
… approach provides a way to arbitrarily set atmospheric properties at any radius from the occulting body, giving it flexibility for applying models of vertical variation in atmospheric conditions. The method is used to examine trends in lightcurve characteristics resulting from changes in the …
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Near-real time atmospheric density model correction using space catalog data
… density of observations, and susceptibility to atmospheric conditions can be examined. Methods of forecasting the density correction models are also validated under different atmospheric conditions.
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Model-agnostic Methodology for High-Altitude Balloon Mission Planning
… balloons (HABs) are increasingly used for atmospheric science, technology validation, Earth observation, and resilient communications. There is a need for modeling HABs in multi-domain missions, and a key challenge for incorporating them is their flight trajectory dependence on atmospheric …
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Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads
… models. For different types of explosives and atmospheric conditions, two models predict the incident and reflected peak pressure generated by the explosion and two models predict the incident and reflected positive time duration of the blast wave. The models are probabilistic to capture the …
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Simulation of high resolution winds over the southern Benguela upwelling system with potential application to harmful algal blooms
… Dinoflagellates are favoured by stratified conditions. Consequently, temporal or spatial variations in ocean and atmospheric conditions that favour stratification will encourage HAB development. Temporally, prolonged relaxation of the dominant equatorward wings during late summer typically …
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Forecasting the nighttime evolution of radio wave ducting in complex terrain using the MM5 numerical weather model
… mesoscale models to forecast operationally those atmospheric conditions that cause anomalous propagation of radio waves. Providing early warning about where and when such conditions will develop would be particularly useful for military communications. To test mesoscale models' ability to provide …
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Murine embryonic stem cells and hypoxia : growth kinetics, metabolism, and plating efficiency
… environment with higher oxygen levels (i.e. the atmospheric oxygen levels that are normally used to cultivate stem cells) could be bad for the cells, as oxygen is toxic due to its powerful oxidative capacity. In this experiment, J1 murine embryonic stem cells were grown at 0%, 2%, 5%, 10%, and …
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An uncertainty-focused approach to modeling the atmospheric chemistry of persistent organic pollutants
… of fuels, biomass, etc. PFCAs and their atmospheric precursors are used in making firefighting foams, non-stick coatings, and other surfactant applications. I quantitatively examine the relative importance of uncertainty in emissions and physicochemical properties (including reaction rate …
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Tracking algorithms under boundary layer effects for free-space optical communications
… We investigate the best algorithm under various atmospheric conditions and signal-to-noise ratios.
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A Quantitative Assessment of Droplet Sizes in Atmospheric and Engine Environments
… seen between exciplex and pentanone tracers in atmospheric conditions and both gave good agreement with the PDA data. The PDA typically reported a wider spray because had to record for a much longer time to pick up enough droplets, increasing the chances of picking up outlying droplets that …
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Weighting Landsat Digital Data According to Land Cover Emissivity for Surface Temperature Mapping
… Variable emissivities of land cover types and atmospheric conditions often need to be incorporated into surface temperature calculations from TM data. The thermal channel digital counts are weighted according to land cover emissivity and converted into kinetic temperatures (atmospheric …
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Implications of the Dense City Centre to Surface-Atmosphere Exchanges
… region. The impact of surface geometry and atmospheric conditions on the radiation balance is investigated based on local-scale measurements of broadband radiation components. <br/>Long-term radiative and turbulent heat flux measurements suggest a significant amount of energy is supplied by …
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