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 19 of 19 for “"Electromagnetic pulse"”.
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Electromagnetic pulse technology : biological and terahertz applications
Since the mid-1970s, the field of Electromagnetic Pulse (EMP) technology has extended to include High-Power Electromagnetic (HPE) sources/antennas. Two such EMP/HPE antennas, designed to address unique applications, are presented in this dissertation. The first is the Prolate-Spheroidal …
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Lightning Electromagnetic Pulse Functions and Protecting the Artemis Spacecraft
… lightning “channel-base currents” also produce Electromagnetic Pulses (EMPs) which are powerful enough to be measured from the other side of the world. In this thesis, we introduce new channel-base current functions to represent lightning waveforms measured near the Artemis spacecraft, and we …
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Modeling, simulation, and mitigation of the impacts of the late time (E3) high-altitude electromagnetic pulse on power systems
The student, Trevor Hutchins, accepted the attached license on 2015-11-24 at 10:07.
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Power distribution feeder response to the asymmetric saturation of substation transformers caused by significant high-side DC currents.
High-altitude electromagnetic-pulse and geomagnetic disturbances can lead to asymmetric saturation of utility transformer cores by causing significant DC current to flow through the transformer windings. Transformer secondary voltage and current waveforms are distorted by core saturation and this …
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Synthesis Technique of Thickness-Customizable Multilayered Frequency Selective Surface for Plasma-Based Electromagnetic Structures
… bandwidth. These inverter layers are essentially electromagnetic coupling interlayers that can be adjusted to customize the thickness of multilayered FSS without degrading the desired filter performance. A generalized equivalent circuit model is used to provide physical insights of the proposed …
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Optimal digital filter design for dispersed signal equalization
… dispersion, and it increases the difficulty of pulse detection. A system capable of compensating for the dispersion would be desirable, as pulsed signals would be more readily detected after compression. In this thesis, we investigate the derivation of a digital filter to compensate for the …
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Functional impairment in South African children with Obsessive-Compulsive disorder and Attention-Deficit/Hyperactive Disorder
The electromagnetic pulse (EMP) resulting from the detonation of nuclear explosives is a documented and studied phenomenon. What is less well known and understood is the simi- lar yet considerably less powerful occurrence surrounding the detonation of high explosives. The phenomenon was rst noticed …
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Asymptotic and numerical analysis of time-dependent wave propagation in dispersive dielectric media that exhibit fractional relaxation
This dissertation addresses electromagnetic pulse propagation through anomalously dispersive dielectric media. The Havriliak-Negami (H-N) and Cole-Cole (C-C) models capture the non-exponential nature of such dielectric relaxation phenomena, which is manifest in a variety of dispersive dielectric …
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An iterative time reversal high-power microwave approach to detect resonant frequencies of electronics
… a signal processing technique used with wideband electromagnetic pulse reflections from scatterers that has been shown to self-focus on the dominant frequency of simple resonators. Frequency selective iterative time reversal can be implemented to converge on the most dominant resonance of the …
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Foundational Investigations & Astronomical Implications of Quantum Gravity
… hole, can produce a detectable, distinguishable electromagnetic pulse, signaling the existence of an extra dimension of size L â ¼ 10â 18 â 10â 20 m. We derive a generic relationship between the Lorentz factor of a pulse-producing "fireball" and the TeV energy scale. For an ordinary toroidally …
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EMP mitigation and novel detection strategies for laser-plasma experiments
… high resolution and controlled directionality. Electromagnetic pulse (EMP) emission is prevalent in high power laser-plasma interactions and primarily arises due to the return current induced by the ejection of hot electrons from the target.;It is important to study these emissions at high power …
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On the robustness of network infrastructures to disasters and physical attacks
… as well as to physical attacks, such as an Electromagnetic Pulse (EMP) attack. Such realworld events happen in specific geographical locations and disrupt specific parts of the network. Therefore, the geographical layout of the network determines the impact of such events on the network's …
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Measurement And Characterization Of Microwave Transient Electromagnetic Fields Generated From Laser/matter Interaction
… result in the emission of short, transient electromagnetic pulses. Previous investigations into laser generated electromagnetic pulses provide basic information regarding frequencies where such pulses may be present, along with the time duration of the pulses. Such investigations have also …
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Optical rectification in semiconductor waveguides
… and generation of ultrashort electrical pulses by the use of optical rectification at telecommunication wavelengths, λ = 1550 nm. By using optical rectification, an electromagnetic pulse is generated in a completely passive semiconductor waveguide. This pulse is coupled in a microwave …
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Practical localized waves generation
… several shortcomings. A major one is that only pulse peaks were accredited. Either the full profile of the generated pulse was not reported, or it was not closely matching the theoretical profile. Additionally, low resolutions of the generated LWs were reported in the acoustic X-Waves. The …
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2-D Modeling of Electromagnetic Waves with Vibrating Conducting and Dielectric Objects
… provides an analysis of the interaction of electromagnetic pulses with vibrating conducting and dielectric objects. Two-dimensional full-vector Maxwells equations finite-difference time-domain (FDTD) models are employed that include total-field scattered-field incident plane wave source …
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Technique for Measuring Low Level Diffusion Signals on Conduit Protected Cables
Made available in DSpace on 2017-07-06T18:58:53Z (GMT). No. of bitstreams: 2 Spier_Edward_M_MS.pdf: 24756621 bytes, checksum: 747434229d934fd0ac6a9ae6bb51857e (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1976