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 24 for “"Thermals"”.
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Thermals: a collection of short stories in an examination of women's experience stories
… Can't Be Too Careful," "Everybody Else," "Thermals," "Namesake," and "Lifting Up"--are examined to determine whether they meet the criteria of experience story.
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Improvement model for reducing stock-outs using inventory management tools in a commercial company specializing in solar thermals
The objective of the research work is to reduce the stock of a company in San Martín, Peru, that offers the installation service of solar thermal heaters. First, a brief description is presented, the background of the organization and an evaluation of the company's indicators to find the problem …
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SOARNET, Deep Learning Thermal Detection for Free Flight
<p>Thermals are regions of rising hot air formed on the ground through the warming of the surface by the sun. Thermals are commonly used by birds and glider pilots to extend flight duration, increase cross-country distance, and conserve energy. This kind of powerless flight using natural sources of …
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Quantifying entrainment and dilution in numerical simulations of developing thunderstorms
… storms is often obscured by successive thermals in the sheared environments, often rising through the remains of previous thermals that modified the air entrained by the later thermals. The storms growing in strong-shear environments are also broader, so a smaller fraction of the cloud …
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Improving operational effectiveness of Tactical Long Endurance Unmanned Aerial Systems (TALEUAS) by utilizing solar power
… from the environment by utilizing convective thermals as a source of potential energy, and exploiting solar radiation for photovoltaic (PV) energy to achieve long endurance flight of an autonomous glider. The dynamic behavior of convective thermals, as well as their mathematical models, are …
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Laminar Analogues of Atmospheric Phenomena
… of the thesis is given over to the study of thermals. We consider the life cycle of an axisymmetric laminar thermal as it transitions through a number of distinct stages undergoing several morphological changes. A significant achievement of the study is to establish a mathematical framework …
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Fusion of sensor information to measure the total energy of an aircraft and provide information about flight performance and local microclimate
… have developed algorithms to search and exploit thermals. However, few people have physically implemented a system and performed field testing. The aim of this project was to develop a low cost system to be carried on a glider to detect thermals effectively. A system was developed from the ground …
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Modeling and Simulation of Autonomous Thermal Soaring with Horizon Simulation Framework
… to exploit this free atmospheric energy from thermals to improve their range and endurance. Researchers had successfully flown UAVs autonomously with thermal soaring method. Most research involved some form of flight simulation. Improvements to the aircraft and thermal models for simulation …
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A numerical modeling investigation of entrainment in cumulus congestus clouds and its effects upon precipitation
… congestus was used to analyze how successive thermals diluted differently when entraining air locally modified by their predecessors. Directly-calculated entrainment rates were found to be strongest at the rear of each successive thermal, but the entrainment rates alone cannot predict the …
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THE OBSERVED VARIATION OF COHERENT UPDRAFT OBJECTS WITH HEIGHT IN THE CONVECTIVE BOUNDARY LAYER
Buoyant plumes and thermals rising through the convective boundary layer (CBL) modulate the flux of heat, moisture, momentum, and aerosols from the surface to aloft. These fluxes also determine the lower boundary conditions for cumulus development (e.g., shallow vs. deep cumuli) provided that …
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Tempest: A Framework for High Performance Thermal-Aware Distributed Computing
… the runtime effects of processor frequency on thermals. Our experiments indicate HPC workload characteristics greatly impact the effects of DVFS on temperature. We propose a thermal-aware DVFS scheduling approach that proactively controls processor voltage across a cluster by evaluating and …
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Dynamics of particle clouds related to open-water sediment disposal
… axisymmetric "clouds" resembling selfsimilar thermals. Current particle cloud models employ thermal theory and an integral approach using constant entrainment (a), drag (CD), and added mass (k) coefficients. The aim of this study was to investigate how real sediment characteristics (particle …
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An aircraft and provide information about flight performance and local microclimate
… have developed algorithms to search and exploit thermals. However, few people have physically implemented a system and performed field testing. The aim of this project was to develop a low cost system to be carried on a glider to detect thermals effectively. A system was developed from the ground …
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Dynamics of downdruaghts and cold pools: an experimental and numerical study
… theory. More recently they have been compared to thermals rather than plumes, and their flow along the ground after impact as axisymmetric gravity currents, for example in the study performed by Rooney (2015). In this thesis both numerical and laboratory experiments have been performed by …
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High Reynolds Number Unsteady Thermal Convection in a Shallow Layer
… transfer of longitudinal momentum in thermals was also observed. Implications with regard to the mean flow were discussed. Turbulent moment data were also applied to a second order closure model which included the transport mechanism by buoyancy. Finally, power spectra and spectral …
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The influence of primary nucleation and rime splintering on ice number concentrations in southern ocean cumuli
… through the mechanism of multiple, successive thermals in the simulations, combined with the rime splintering process, are the high ice number concentrations able to be reproduced. Sensitivity studies demonstrate the sensitivity of the calculations to the number of ice-nucleating particles and …
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Sedimentation in a stratified ambient
… particle clouds behave as turbulent fluid thermals; however, their radial expansion eventually stops and particles settle from the base of the cloud at their individual settling speed. We focus on deducing a criterion for the various modes of particle deposition from particle clouds in a …
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Importance of boundary layer entrainment for surface fluxes over land
… The addition of entrainment from overshooting thermals weakened the Bermuda high circulation and weakened the spatial gradients between the warm, dry semiarid southwestern United States and cooler, moister locations in eastern North America. These subtle variations produced a 3.5 ppm CO2 change …
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The fluid dynamics of pressure die casting processes
… including the filling pattern, residual flow, thermals and air entrapment during cavity-fill and post cavity-fill within a one single shot cavity filling in water analogue experiments. A discussion, conclusions and suggestions for further study of the subject concerned are presented in Chapters …
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