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 21 for “"water surfaces"”.
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Evaporation from free water surfaces
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1958.
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Spatio-Temporal Analysis of Flows Close to Free Water Surfaces
In order to examine the air-water gas exchange, a detailed knowledge is needed about the flow field within and beneath the water-side viscous boundary layer. Therefore a novel measurement technique is developed for the spatio-temporal analysis of flows close to free water surfaces. A fluid volume …
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Water Surfaces Detection from Sentinel-1 SAR Images using Deep Learning
… is very convenient to use SAR image for surface water detection because the flatness of the calm water surface reflects off all the energy from the radar and this makes the surface water appears in a SAR image as dark pixels. The traditional way to mark out water from SAR images is by just using …
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The effect of dikes on water surfaces in a mobile bed
… of bank and designed to be effective only in low water, it is necessary to understand their effect on water surfaces, particularly for flood flows. To help answer questions that have arisen as to the effect of dikes on flood levels, this study considers effect of movable bed, which has been …
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A new technique for 3D modeling of water surfaces using a Geiger mode receiver
… real time) create a digital surface model of a water surface using bathymetric lidar when presented with water turbidity. Accurate and consistent modeling of the water surface is required in order to correct for the surface’s volatility when imaging the sea floor. However, this becomes …
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Modeling riparian groundwater depth as a function of river flow for the Rio Grande at Albuquerque, NM
… streamflows in semi-arid regions, riparian groundwater will be similarly reduced, impacting native and non-native flora. This paper presents a geographic information system (GIS) based approach for creating comprehensive riparian water surfaces from point surface water and groundwater …
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The FEV Frontend: A Terrain and Water Simulation Client
… FEV system that includes a backend for solving water flow equations using CUDA. To render large datasets, level-of-detail and other optimizations are needed to render terrain and water surfaces with interactive frame rates.
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Solubilisation and emulsification of silicone oils in aqueous surfactant systems
… surfactant (AOT).For nonionic surfactants at oil-water interfaces, the effect of temperature, surfactant structure, electrolyte concentration and PDMS molecular weight on the emulsion phase inversion of water/PDMS/surfactant systems has been studied in detail. For certain nonionic surfactants the …
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Control of the self-assembly of alkanethiol-coated gold nanoparticles in the solid state
… films of gold nanoparticles on water surfaces are subjected to thermal and ultrasonic treatment in an attempt to correct defects in the films, which are then transferred to solid substrates for observation. Unfortunately, none of these approaches is able to reduce the defect …
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Design and Implementation of a Passive Stereo-Infrared Imaging System for the Surface Reconstruction of Water Waves
… an understanding of how they are influenced by water waves is necessary. This work presents a passive, infrared stereo-imaging system for the reconstruction of a wavy water surface. The system does not require a sub-merged light source, so it is suitable for field operation. The structure of the …
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Delineation of Surface Water Features Using RADARSAT-2 Imagery and a TOPAZ Masking Approach over the Prairie Pothole Region in Canada
… are common, and they are an essential water storage element in the regional hydrological system. The accurate delineation of surface water bodies is important for a variety of reasons, including conservation, environmental management, and better understanding of hydrological and climate …
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The Vulnerability of Northern High-Latitude Ecosystems to Climate and Disturbance-Induced Change
… dynamics that exert strong controls on energy, water, and biogeochemical cycling; (2) Quantifying underlying drivers of change related to contemporary trends in land and water surfaces observed by remote sensing; and; (3) Providing novel approaches and baseline information to fill critical …
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Effects of Aqueous Organic Coatings on the Interfacial Transport of Atmospheric Species
… between either phase, however organic coated water surfaces are ubiquitous in the environment, and the physical and chemical processes that occur at organic coated aqueous surfaces are often different than those at pure air—water interfaces. Three studies were performed investigating the …
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Design and implementation of non-photorealistic rendering techniques for 3D geospatial data
… of geospatial feature type entities such as water surfaces, buildings, and infrastructure networks. In addition, this thesis contributes a generic system that enables to integrate different graphic styles—photorealistic and non-photorealistic—and provide their seamless transition according to …
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Leibniz-type rules associated to bilinear pseudodifferential operators
… Vries equations (which model waves on shallow water surfaces). Bilinear pseudodifferential operators act to combine two functions using their Fourier transforms and a symbol, which is a function that assigns different weights to the functions’ frequency components as they are combined. Thus, …
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Gas Exchange Of Hg Over Wetlands, Effect Of Biochar And Activated Carbon On Hg Emissions From Soil, And Seasonal Concentrations Of Hg In Rain
… the atmosphere and aquatic or terrestrial surfaces serves as an important, but not well understood, route for Hg to enter and exit ecosystems. To better understand the role of gaseous Hg exchange in the biogeochemical cycling of Hg, we investigated Hg0 fluxes over natural wetlands (Sky …
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Impacts of the non-native aquatic plant water chestnut, Trapa natans, on inland freshwater nitrogen and oxygen dynamics, and host-specificity testing of the biological control insect, Galerucella birmanica
Water chestnut, Trapa natans, is a non-native aquatic plant with floating rosettes of leaves that has established and continues to spread in northeastern North America. Growing in calm freshwater environments, T. natans can grow densely on water surfaces, transforming open waters into thick …
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Connecting Water Quality With Air Quality Through Microbial Aerosols
Aerosol production from surface waters results in the transfer of aquatic materials (including nutrients and bacteria) to air. These materials can then be transported by onshore winds to land, representing a biogeochemical connection between aquatic and terrestrial systems not normally considered. …
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Design and microfabrication of multifunctional bio-inspired surfaces
… hierarchical multifunctional bioinspired surfaces. Different natural surfaces have been surveyed including well-known lotus leaf, sharkskin, back of the Namib Desert beetle, butterfly wings, and legs of water-walking insects. The lotus leaf features superhydrophobicity, which leads to low …
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Experimental and Numerical Modeling of Dam-Break and Levee-Breach Flows
… data set may be utilized to validate shallow water models and 3-D computational fluid dynamics models of free-surfaceflow. </p> <p> A two-dimensional idealized dam-break experiment was conducted in a straight flume. Dam failure was modeled by suddenly lifting a gate inside a flume for …
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