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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
A Novel Approach For Identifying Cloud Clusters Developing Into Tropical Cyclones, Chaunte' W. Lacewell
A Novel Approach For Identifying Cloud Clusters Developing Into Tropical Cyclones, Chaunte' W. Lacewell
Dissertations
Providing advance notice of rare events, such as a cloud cluster (CC) developing into a tropical cyclone (TC), is of great importance. Having advance warning of such rare events possibly can help avoid or reduce the risk of damages and allow emergency responders and the affected community enough time to respond appropriately. Considering this, forecasters need better data mining and data driven techniques to identify developing CCs. Prior studies have attempted to predict the formation of TCs using numerical weather prediction models as well as satellite and radar data. However, refined observational data and forecasting techniques are not always available …
Numerical Investigation Of Orographic Effects On Supercell Thunderstorms, Galen M. Smith
Numerical Investigation Of Orographic Effects On Supercell Thunderstorms, Galen M. Smith
Dissertations
Orographic effects on tornadic supercell development, propagation, and structure are investigated using the Cloud Model 1 with idealized bell-shaped mountains of various heights and geometries and a homogeneous fluid flow with a single sounding. In total, the variations of height and geometry yield 16 terrain configurations. It is found that blocking effects are dominative compared to the terrain-induced environmental heterogeneity downwind of the mountain. The isolated bell-shaped mountains tended to shift the track of the storm towards the left of storm motion; however, when the terrain was elongated the effect tended to be rightward. The terrain blocking effect also enhanced …
Use Of Sweet Potato To Develop A Medium For Cultivation Of Lactic Acid Bacteria, Saeed A. Hayek
Use Of Sweet Potato To Develop A Medium For Cultivation Of Lactic Acid Bacteria, Saeed A. Hayek
Dissertations
This study investigated the use of sweet potatoes (Ipomoea batatas) as a basic component to develop a medium for cultivation of lactic acid bacteria (LAB). Extract from baked sweet potatoes was used to form a sweet potato medium (SPM). SPM was supplemented with 4 g/L of each nitrogen source (beef extract, yeast extract, and proteose peptone #3). Lactobacilli MRS was used as a control medium. Ten LAB strains were used to determine the suitability of SPM serving the growth of LAB. Our results showed no significant (p < 0.05) differences in the optical density, maximum specific growth rates, and bacterial populations between MRS and SPM. SPM also maintained higher pH values throughout the incubation period compared to that in MRS. The cost of SPM was 47% less than the cost of MRS. Further step was taken to determine the suitability of SPM serving LAB enzymatic activity. LAB strains growing in SPM showed relatively higher β-glucosidases, acid phosphatase, and phytase activities and lower a-glucosidase compared to that in MRS. Strains of L. reuteri showed the …
Adoption Of Green Building Practices And Rating System In Kenya: Potentials And Barriers, Peter Khaemba
Adoption Of Green Building Practices And Rating System In Kenya: Potentials And Barriers, Peter Khaemba
Dissertations
This research study was undertaken to identify (a) green building rating attributes that could be adopted for Kenya, and (b) barriers to initial adoption of green building practices and a green building rating system in Kenya. The study was primarily built on the premise of select rating and adoption attributes in existing green building standards, especially Leadership in Energy and Environmental Design (LEED). A pilot phase of the study was conducted using a combination of focus groups and personal interviews. The pilot findings became the basis of a questionnaire that was utilized to survey a sample of 608 registered building …
Tropical Cyclone Intensity Estimation Using Temporal And Spatial Features From Satellite Data, Gholamreza Fetanat Haghighi
Tropical Cyclone Intensity Estimation Using Temporal And Spatial Features From Satellite Data, Gholamreza Fetanat Haghighi
Dissertations
Accurate intensity estimation of tropical cyclones (TC) is an important topic of research due to its economic impact and public safety concerns. An accurate measure of the current wind strength is necessary to accurately predict TC intensity. We have developed and tested automated method to estimate TC intensity based on the existing historical satellite images alone. The Hurricane Satellite data (HURSAT-B1) is used to develop the algorithm, which focuses on the North Atlantic from 1978-2009. The algorithm is trained and validated using aircraft reconnaissance-based data. Here, the data is restricted to include only fixes that are over water and are …
Synthesis And Photoluminescence (Pl) Of Gold (I) And Silver (I) Metal Complexes With 1-Methylbenzimidazole Diphenylphosphine (Mbdp): Potential Sensing Applications For Volatile Organic Compounds, Darkus Elizabeth Jenkins
Synthesis And Photoluminescence (Pl) Of Gold (I) And Silver (I) Metal Complexes With 1-Methylbenzimidazole Diphenylphosphine (Mbdp): Potential Sensing Applications For Volatile Organic Compounds, Darkus Elizabeth Jenkins
Dissertations
Volatile organic compound(s), VOC(s), detection have become a highly demanding area of research due to potential harmful effects to the ecosystem. The search for methods of VOC sensor devices has led to the examination of photoluminescence and photoluminescent materials such as metal complexes. Their luminescent properties markedly with phosphine and/or nitrogen based ligands, bridging ligands, have the ability to accommodate metal atoms with short metal – metal distances. It is of great interest to accomplish short metal interactions as the photoluminescent properties can be altered. We show the synthesis and structural characterization of the bridging ligand, 1-methylbenzimidazole diphenylphosphine. We examined …
Investigating Fabrication Methods For Micro Single-Chamber Solid Oxide Fuel Cells, Man Yang
Investigating Fabrication Methods For Micro Single-Chamber Solid Oxide Fuel Cells, Man Yang
Dissertations
A Solid Oxide Fuel Cell (SOFC) is a green energy technology that offers a cleaner and efficient alternative to fossil fuels. The efficiency and utility of SOFCs can be enhanced by fabricating miniaturized component structures within the fuel cell footprint. This research focuses on the microfabrication of parallel-connected inter-digitized design of micro single chamber SOFC (μ-SC-SOFCs). In this dissertation, candidate micro/nano fabrication techniques to precisely fabricate micro patterns on planar substrates have been studied. These include EBL, soft lithography, photolithography, and direct-writing. After analyzing preliminary results, two combinational approaches were further investigated. The first method involves the combination of the …