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 15 of 15 for “"back-scatter"”.
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Influence of photospheric back-scatter on flare hard x-ray diagnostics.
… studies on the influence of solar photospheric back–scatter on Hard X–Ray (HXR) flare diagnostics. Specifically the thesis presented is concerned with the effect of back–scatter photons upon the morphology of the Hard X–Ray photon spectrum and its effect on the inferred parent electron spectrum. …
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Co-processor offloading applied to passive coherent location with Doppler and bearing data
… of receivers to track targets through their back-scatter from existing Continuous Wave (CW) transmissions, such as broadcast TV or radio. The lack of an active transmitter in a PCL system results in relatively low procurement, operation and maintenance costs. This is of particular advantage …
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Characterization of Structures and Deformation in the Brittle-Ductile Transition, Western Termination of the Chugach Metamorphic Complex, Southern Alaska
… fault with 90km of dextral offset. Electron Back Scatter Diffraction (EBSD) and microstructural observations revealed deformation mechanisms were primarily compositionally controlled, whereas P-T-t conditions played a secondary role. Other factors, deemed to be of lesser influence included …
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The Photosynthetic Action Spectra of the Phytoplankton and Their Role in Governing Spatial and Temporal Distribution: A Numerical Modeling Approach
… decay model with a correction for diffuse back scatter. Taken together, the atmospheric and hydrospheric models define the spectral composition and intensity of light in the sea as a function of solar altitude and depth. This permits the simulation of realistic spectral gradients along …
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Orthogonally coded MIMO array for Ka-band (26.5 - 40 GHz) millimeter-wave imaging
… method allows the array to distinguish the radar back-scatter for each transmitter of the imaging system when they are operated simultaneously. This simultaneous operation of the imaging system enables high-speed synthetic aperture radar imaging for non-destructive testing applications. The system …
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Understanding the effect of aluminium on the microstructure on low level nitrogen steel
… contents (0.02, 0.48 and 0.94 wt%). Electron back scatter diffraction (EBSD) was employed to study the effect of excess aluminium (apart from aluminium nitride) on the final ferritic microstructure. In order to have a better understanding in relation to the role of excess aluminium in ferritic …
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Multivariate Analysis for Scanning (Transmission) Electron Diffraction
… - for the first time - to indexed electron back-scatter diffraction (EBSD) orientation data, and shown to be an ideal algorithm. The novel use of data clustering in the context of misorientation data is also presented, opening up the possibility for semi-automated crystallographic habit …
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Large Eddy Simulations of complex turbulent flows
… It can represent large scale anisotropy and back-scatter of energy from small-to-large scale through scale-similar term and maintain the energy drain through eddy viscosity term whose coefficient is allowed to change with in the computational domain. This code is validated for several …
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The application of laser measurement techniques to the pneumatic transport of fine particles
… situations, light from a low powered laser is scattered by seeding particles in the fluid which are small enough to follow the flow. The resulting Doppler shift of the scattered light is proportionate to the velocity of the particles and hence, to the velocity of the fluid. When solid particles …
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The Smallest Base and Precious Metal Deposits in the World: Vapor Transport and deposition of Co-Cu-Sn-Ag alloys in vesicles
… alloys rarely exceed about 0.4 wt%. Electron back-scatter diffraction (EBSD) was employed for lattice characterization of the exsolved phases and shows a FCC structure for the Cu-Sn section of the alloys. Cu-Sn alloys high in Sn are successfully indexed using the Cu6Sn5 pattern (hexagonal), …
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Efficient Tunnel Detection with Waveform Inversion of Back-scattered Surface Waves
An efficient subsurface imaging method employing back-scattered surface waves is developed to detect near-surface underground elastic-wave velocity anomalies, such as tunnels, sinkholes, fractures, faults, and abandoned manmade infrastructures. The back-scattered surface waves are generated by …
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Radio Characterisation of Single Trees at Micro- and Millimetre Wave Frequencies
… environment, giving rise to both absorption and scatter of radio signals. An important part of the modelling process applied to vegetation effects is aimed at analysing the radio propagation modes and the identification of individual signal contributions to the scattered signal caused by various …
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Advanced experimental measurements of heterogeneous strain and temperature change in metals
… to microstructural data obtained with electron back-scatter diffraction. The approach utilized air blasting particles that were capable of remaining unchanged onto a sample surface and loading the sample at elevated temperatures in vacuum to prevent oxidation. Two tensile experiments were …
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Microstructure and texture development during high-strain torsion of NiAl
… are studied by different techniques (Electron Back-Scatter and High Energy Synchrotron Radiation). Beside the development of microstructure and texture with shear strain, the effect of an initial texture as well as the deformation temperature on the development of texture and microstructure …
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Studium dynamiky deformačních procesů ve slitinách Mg-RE pomocí in-situ experimentálních metod
Předložená práce se zabývá studiem dynamiky deformačních procesů binárních slitin Mg-Gd pomocí in-situ experimentálních metod v závislosti na koncentraci Gd. Zkoumané lité slitiny jsou charakterizované náhodnou texturou. Tlakové zkoušky byly provedené se souběžným záznamem akustické emise, ze …