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 89 for “"in situ observations"”.
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Assessment of the synoptic variability of the Antarctic marginal ice zone with in Situ observations
… change trends, stems primarily from remote sensing information. However, sea ice in the Southern Ocean is characterised by large variability that remains unresolved and limits our confidence on the remotely sensed products. Although one of the biggest seasonal changes on Earth is the annual …
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Evaluation of triple-frequency radar retrieval of snowfall properties using coincident airborne in-situ observations during olympex
Particle scattering models have shown that aggregates and spherical particles occupy distinct regions of the Ku-Ka-W-band Dual-Frequency Ratio (DFR) plane. Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is …
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The sediment, river plume, and inner shelf variability in a bay with multiple fluvial inputs
Small mountainous rivers deliver considerable sediment loading to the coastal ocean and play a disproportionate role in marine sediment deposition globally. Discharge in these rivers is often driven by short episodic events and they typically deliver sediment to energetic coastal environments where …
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Investigating the local circulation of the southeast Cape Basin
… coast of southern Africa, the southeast Cape Basin is characterised by a unique combination of strong coastal upwelling and vigorous offshore mesoscale variability. The juxtaposition of offshore mesoscale variability and coastal upwelling results in a complex and dynamic environment. In this …
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High-Velocity Microparticle Impact for Analytical Modelling of High-Strain-Rate Mechanics and Material Behavior
A recent optical technique for conducting and observing high-velocity micron-scale impacts against various materials is the focus of this work. This technique, the laser-induced particle impact test (LIPIT), is capable of accelerating microparticles to supersonic velocities to achieve strain-rates …
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The response of the Red Sea to a strong wind jet near the Tokar Gap in summer
Remote sensing and in situ observations are used to investigate the ocean response to the Tokar Wind Jet in the Red Sea. The wind jet blows down the pressure gradient through the Tokar Gap on the Sudanese coast, at about 18°N, during the summer monsoon season. It disturbs the prevailing along-sea …
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The response of the Red Sea to a strong wind jet near the Tokar Gap in summer
Remote sensing and in situ observations are used to investigate the ocean response to the Tokar Wind Jet in the Red Sea. The wind jet blows down the pressure gradient through the Tokar Gap on the Sudanese coast, at about 18°N, during the summer monsoon season. It disturbs the prevailing along-sea …
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Descriptive analysis of a virtual transect through the Benguela Upwelling System
With the limitations of in situ observations of the ocean, numerical modeling of the ocean can easily provide clues to the structures and processes that lie therein. This project is an example of the examination of numerical model output. In this case, the area of interest is an area of ocean off …
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Compressibilidade unidimensional da argila cinza do Rio de Janeiro em Botafogo
This work aims at determining the compressibility characteristics of a soil subjected to consolidation caused by reduction of hydraulic pressure of a confined watertable. The equipment utilized, a hydraulic oedometer manufactured by W. Farrance Co. permitted the use of back pressure and the …
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The Use of Remote Sensing for Coral Reef Mapping in Support of Integrated Coastal Zone Management: A Case Study in the NW Red Sea - Volume I
Worldwide, coral reefs are rapidly degrading due to the combined negative effects of human activities and global change. Even though the Red Sea is a very suitable natural environment for coral reef growth, their status also has rapidly deteriorated since the 1970s. Coral reefs are especially …
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Solar activity variations of the ionospheres of Venus and Mars
… from the Sun generate a partially ionized region in the atmosphere of a planet called an ionosphere. Solar activity, including solar flares, coronal mass ejections, and changes in the ionizing irradiance affect planetary ionospheres on short and long timescales. These effects are significant …
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Satellite Constellation Optimization for In-Situ Sampling and Reconstruction of Tides in the Thermospheric Gap
… atmosphere is a dynamic region with a complex interplay of energetic inputs, outputs, and transport mechanisms. A complete understanding of the atmosphere and how various fields within it interact is essential for predicting atmospheric shifts relevant for spaceflight, the evolution of Earth's …
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Pollination biology of four co-occurring Erica species from the Cape Peninsula, South Africa
Although pollinators have been suggested to drive speciation in the Cape flora, this has not been tested for the largest, florally diverse Cape genus Erica. Speciation studies that focus on pollination biology often use floral syndrome characters to predict a species' functional pollinator group/s. …
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Dislocation -Obstacle Interactions in Aluminum Alloys
This thesis examines two types of dislocation-obstacle interactions: dislocation-particle interactions during creep deformation, and dislocation-loop interactions during deformation at room temperature. Dislocation-particle interaction studies in Al-Zn-Mg-Cu-Zr, Al-4Mg-0.3Sc, and Al-0.3Sc showed …
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Battery-Free Wireless Imaging of Underwater Environments
Imaging underwater environments is of great importance to marine sciences, ocean sustainability, climatology, defense, marine robotics, geology, space exploration, and global food security. Despite advances in underwater imaging, most of the ocean and marine organisms remain unobserved and …
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Etching of Gallium Arsenide with atomic hydrogen
An optical interferometric method is used to make in-situ observations of continuous etching of the (100) GaAs surface during exposure to a known concentration of thermalised hydrogen atoms downstream from an H₂ plasma. Etch rates between 3 and 9 nm/min are followed at constant temperature within …
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Operational Use of Specific Differential Phase Shift in Dual Polarization Radars
… available to operational weather forecasters since the WSR-88D upgrades were completed in May 2013. Though most often used as a component in quantitative precipitation estimates, this research focused on determining if KDP is strong enough of a stand-alone product for meteorologists to use in …
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CARATTERIZZAZIONE DEI PIGMENTI DELL'INVECCHIAMENTO NEL CERVELLO UMANO:NEUROMELANINA E LIPOFUSCINE
Neuromelanin and lipofuscin are two pigment that both accumulate in central nervous system with aging. The presence and the morphology of these substances have been described more than one century ago but in the past the two pigments haven’t been unmistakably distinct. Today is important to …
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