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 125 for “"electromagnetic radiation"”.
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Computation of multiscale time-harmonic electromagnetic radiation
The effect of installation for an antenna is key to understanding its performance in the intended operating environments. While existing formulations support such analysis, their mapping of calculations to distributed computing hardware does not support simulating installation environments of …
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Novel electromagnetic radiation in Left-Handed materials
In this thesis, Cerenkov radiation of a moving charged particle inside a Left-Handed material (LHM) is studied through both theory and numerical simulations. A LHM is a material whose permittivity and permeability have negative real parts. In the analysis of this thesis, the general theory of …
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Exploiting quasiperiodic electromagnetic radiation using software-defined radio
Electronic devices emanate unintentional electromagnetic radiation from which an attacker can extract sensitive information. In video display units these are quasiperiodic: nearly periodic in the short term. Video-eavesdropping attacks on these, a main motivation for the use of TEMPEST shielded …
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Nanophotonics for tailoring the flow of thermal electromagnetic radiation
… thesis, we explore the interaction of thermal radiation with nano-scale structures. First, we introduce the concept of radiative energy transfer between two objects of different temperatures in the near field, and theoretically argue that the radiation tunneling of evanescent surface modes can …
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Electromagnetic radiation calorimetry of thermoplastics, elastomers and composites systems
The application of microwave radiation for processing of glassy and semicrystalline thermoplastics, elastomeric polymers and composites was investigated. The goal of this research was to reveal the relationship between polymer structure and microwave absorptivity, and hence processability. The …
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Simulation Studies of Parametric Processes Associated with Ionospheric Electromagnetic Radiation
… processes are thought to produce Stimulated Electromagnetic Emissions (SEE) during ionospheric heating experiments. The phenomenon is primarily attributed to plasma turbulence excited by the high frequency HF heater in the altitude region where the pump frequency <i>ω</i>₀ is near the plasma …
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Attenuation of electromagnetic radiation by water droplets in the atmosphere
This thesis deals with the theoretical analysis of the effect of the water droplets in the atmosphere on the propagation of a linearly polarized plane wave. These effects are (1) scattering - it is found that the scattered power is proportional to the sixth power of the radius of the droplet, also …
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A Linear Response Analysis of Electromagnetic Radiation Emanating From A Plasma
Made available in DSpace on 2014-12-08T22:24:42Z (GMT). No. of bitstreams: 1 7000990.pdf: 4940158 bytes, checksum: 682589e0d7fb6b32daeb8d3883d01b39 (MD5) Previous issue date: 1969
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A linear response analysis of electromagnetic radiation emanating from a plasma
"A many body analysis is made to determine the radiation (due to current fluctuations) that emanates from a high-density, low-temperature ""quantum"" plasma, and in the classical limit, for a low-density, high-temperature ""classical"" plasma. Radiation due to field fluctuations that are …
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Experimental methodology for non-thermal effects of electromagnetic radiation on biologics
… for research on the effects of radio-frequency radiation from radio-frequency identification (RF-ID) systems on biological materials. In the present study, a complete test system comprising assembled hardware and custom-built software was developed for a research project investigating whether …
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Next Generation Multifunctional Composites for Impact, Vibration and Electromagnetic Radiation Hazard Mitigation
… of the hybrid composites by facilitating electromagnetic interference (EMI) shielding. Chapter 6 is devoted to characterizing the electrical properties of hybrid CNT-fiberglass FRPs modified via GSD method. Using a slightly modified version of the GSD, denser and longer CNTs were grown on …
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Categorization of electromagnetic radiation scatterers by means of synthetic aperture radar (SAR) images
… can be active sensors that transmit polarized electromagnetic waves towards the Earth and then receive the echoes that are backscattered. Such an active radar system is independent of solar illumination, allowing day and night imaging. Nowadays radar systems are capable of providing very high …
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Spectral-Iterative Analysis of Electromagnetic Radiation and Scattering Problems (radar-Cross-Section, Integral Equation)
Integral equations in electromagnetics typically are convolutional in nature. When the geometry of the problem permits, the unknown function can be expanded in a set of identical, evenly spaced basis functions. If the integral equation is tested in the same way, the continuous convolutions reduce …
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Fundamental experiments on the response of solutions, polymers, and modified polymeric materials to electromagnetic radiation
This dissertation is divided into two sections. In the first section dielectric and magnetic properties were analyzed for a series of materials: bisphenol A solutions, a poly(amideimide), and polymers filled with either carbon black, iron particles, or aluminum flake. The second section deals with …
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Electromagnetic radiation level detection and monitoring system for triple band GSM signal using calculable antenna factor method
The project is about monitoring electromagnetic (EM) radiation level for mobile frequency range where the system is capable of detecting the level of electromagnetic radiation (in volts/meter) by the receiver antenna (sensors) at the frequencies of 0.9 GHz, 1.8 GHz and 2.1 GHz. The system then …
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The Dielectric Tube Resonator-a Slow-Wave, Open Boundary, Dielectric Resonator for The Generation and Measurement of Millimeter and Submillimeter Wavelength Electromagnetic Radiation
Made available in DSpace on 2014-12-04T21:03:06Z (GMT). No. of bitstreams: 1 5902004.pdf: 11355962 bytes, checksum: 13141c1b532a2eb7b5eec65b12a1e0f6 (MD5) Previous issue date: 1959
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Interaction of Metal Nanoparticles with Fluorophores and Their Effect on Fluorescence
… nanoparticle, their mode of interaction with electromagnetic radiation and the outcome of this interaction vary; in turn the effect exerted on a protein which is conjugated to a nanoparticle varies, because different sized nanoparticles demonstrate different modes of energy transfer with …
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Bio-inspired optical components
Guiding electro-magnetic radiation is fundamental to optics. Lenses, mirrors, and photonic crystals all accomplish this task by different routes. Understanding the interaction of light with materials is fundamental to improving and extending optical science and engineering as well as producing …
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