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 12 of 12 for “"electromagnetic emission"”.
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Study of Narrow-Band Spectral Characteristics of Stimulated Electromagnetic Emission (SEE) During Second Electron Gyro-Harmonic Heating
Stimulated Electromagnetic Emissions SEEs may provide important diagnostic information about space plasma composition, energetics, and dynamics during active experiments in which ground-based high powered radio waves are transmitted into the ionosphere. The nonlinear plasma processes producing this …
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Validating surface evolution modeling on high temperature selective emitters : an investigation of the thermal stability of nano-scale surface structures for thermophotovoltaic systems
… Nano-patterned features can im prove electromagnetic emission from the TPV emitter, increasing system efficiency. These features, however, degrade at high temperatures over tine. One of the main contributors to surface evolution is surface diffusion. This investigation tested surface …
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Numerical simulation of stimulated electromagnetic emissions in the ionosphere
… to study the spectral features of stimulated electromagnetic emission (SEE). SEE is a potential diagnostic tool to study the ionosphere and its spectrum provides a different view of the heated region from the incoherent scatter radar. At this time, a unified and complete theory which explains …
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Mergers of Supermassive Black Hole Binaries in Gas-rich Environments: Models of Event Rates and Electromagnetic Signatures
… black holes with both gravitational and electromagnetic waves. Such synergistic, "multi-messenger" studies can probe the expansion history of the Universe and shed light on the details of accretion astrophysics. This thesis examines the mergers of supermassive black hole binaries and the …
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Active control of massively separated high-speed/base flows with electric arc plasma actuators
… to evaluate the operational characteristics, electromagnetic emission, and fluidic effect of the actuators in quiescent ambient air. The maximum velocity induced by the arc when formed in a 5 mm x 1.6 mm x 2 mm deep cavity was about 40 m/s. During breakdown, the electromagnetic emission …
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Theoretical and Numerical Studies of Frequency Up-shifted Ionospheric Stimulated Radiation
Stimulated electromagnetic emission (SEE) produced by interactions of high-power radio waves with the Earth's ionosphere is currently a topic of significant interest in ionospheric modification physics. SEE is believed to be produced by nonlinear wave-wave interactions involving the electromagnetic …
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Plasma processes in pulsar environments
… stars identified by their periodically pulsed electromagnetic emission. The source of the radiation is believed to be associated with the electron-positron (pair) plasma populating the pulsar magnetosphere. The theory of pulsar radiation is still in its infancy and there is lack of …
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Energy Emissions from Critical Phenomena and Applications to Structural Health Monitoring
… to micro-scale. By analyzing the energy emission from their critical processes, some useful information or suggestion is extracted and to be provided in structural health monitoring (SHM). Three different forms of energies, acoustic emission (AE), electromagnetic emission (EM) and neutron …
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Analysis of Plasma Wave Irregularities Generated during Active Experiments in Near-Earth Space Environment
… experiment involves a transmission of high power electromagnetic waves into the ionospheric plasma from the ground, which can excite stimulated electromagnetic emissions offset from the transmitter frequency. These stimulated electromagnetic emissions provide diagnostic information of the …
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Relativistic Jets from Compact Binary Mergers as Electromagnetic Counterparts to Gravitational Wave Sources
… astronomy, an understanding of all the potential electromagnetic counterparts to a gravitational wave detected source will help maximise the science returns. Here I present a study of the electromagnetic emission from relativistic jets that accompany the merger of binary neutron stars or black …
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Seismic precursor identification method integrating acoustic emission physical models and multi-source data
… propagation to macroscopic instability. Acoustic emission (AE), as stress waves generated by the release of strain energy during rock microfracturing, offers the potential to capture direct physical effects of earthquake preparation and to explore physics-based earthquake precursor identification. …
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New-Measurement Techniques to Diagnose Charged Dust and Plasma Layers in the Near-Earth Space Environment Using Ground-Based Ionospheric Heating Facilities
… of this dissertation is dedicated to Stimulated Electromagnetic Emissions SEEs produced by interaction of high power electromagnetic waves in the ionosphere. Nearearth ionospheric plasma presets a neutral laboratory for investigation of nonlinear wave phenomena in plasma which can not be studied …