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 39 for “"Electromagnetic induction"”.
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A Telemetry Link Using Electromagnetic Induction
… been carried out on the application of magnetic induction fields to the high security, short-range transmission of power and measurement information through electrically lossy media like soil and water. This differs from conventional telemetry in that remote units are powered by the link and …
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Spatial sensitivity of low-induction-number frequency-domain electromagnetic-induction instruments
… were used to study spatial averaging in low-induction-number frequency-domain electromagnetic induction (LIN FEM) instruments. Local ( LS) and cumulative (CS) sensitivity were used to analyze three different aspects of LIN FEM spatial sensitivity. LS is the variation in a measured property …
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Landmine classification using possibilistic K-nearest neighbors with wideband electromagnetic induction data
… non-mine targets on data obtained from wideband electromagnetic induction sensors. The goal of this work is to develop methods for classifying wide-band electromagnetic induction data into one of several target classes or a non-target class. For some landmine detection systems, it could be …
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Experimental and Analytical Characterization of a Transducer for Energy Harvesting Through Electromagnetic Induction
… work documents recent efforts to model a novel electromagnetic transducer design that is intended for use in energy harvesting. The thesis details methods of experimental characterization as well as model validation. Also presented are methods of state space and parametric modelling eforts. In …
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Pieces of a Puzzle: Fitting Electromagnetic Induction into Geophysical Strategies to Produce Enhanced Archaeological Characterisation
Electromagnetic induction (EM) methods have been utilised in a recent surge of archaeological applications across continental Europe, Ireland and Scandinavia. Development of multi-exploration depth instruments and improvements to instrument stability have improved its reputation as an effective …
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MONITORING STORMWATER INFILTRATION IN A VACANT LOT COMPARING TIME-LAPSE ELECTROMAGNETIC INDUCTION AND ELECTRICAL RESISTIVITY TOMOGRAPHY
… (electrical resistivity tomography [ERT] and electromagnetic induction [EM]) to evaluate method sensitivity and differences between the three zones. ERT proved more sensitive than EM profiling at detecting changes in the three zones. Soil moisture changes in the driveway area were particularly …
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Geophysical Imaging of Earth Processes: Electromagnetic Induction in Rough Geologic Media, and Back-Projection Imaging of Earthquake Aftershocks
… of responses of Earth; that is, seismic and electromagnetic, and aims to better understand Earth processes at a wider range of scales than those conventional approaches offer. Electromagnetic responses resulting from the subsurface diffusion of applied electromagnetic fields through …
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Delineating Wastewater Contaminant Plumes from On-Site Wastewater Treatment Systems in the North Carolina Coastal Plain using Electromagnetic Induction
… to monitor these systems. One technique, low-induction number (LIN) electromagnetic induction (EMI), could provide a means to quickly monitor these systems without intruding the ground surface. Studies employing LIN EMI show that this technique can track wastewater-impacted groundwater in some …
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Downhole vibration sensing by vibration energy harvesting
This thesis outlines the design of a prototype electromagnetic induction vibration energy harvesting device for use in a downhole environment. First order models of the necessary components for a generic vibration energy harvester are presented and used to predict the most sensitive parameters for …
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Finite element modeling of crack detection in aircraft structures using electrical current
… the detection of cracks in metallic structures. Electromagnetic non-destructive testing (NDT) is one of the widely used non-destructive methods used for the detection and characterization of cracks. Utilizing the principle of electromagnetic induction, this technique is used in the areas of …
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Low Frequency Microscale Energy Harvesting
… structure increases as the dimension decreases. Electromagnetic induction is another voltage generation mechanism that has been utilized for VEH. However, the electromagnetic induction based VEH is limited by the magnet and coil size and the decrease in power density at the micro scale. Hybrid …
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Non invasive brain stimulation : modeling and experimental analysis of transcranial magnetic stimulations and transcranial DC stimulation as a modality for neuropathology treatment
… TMS is a technique that uses the principle of electromagnetic induction to focus induced currents in the brain and modulate cortical function. These currents can be of sufficient magnitude to depolarize neurons, and when these currents are applied repetitively (repetitive Transcranial Magnetic …
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Inverse problems in electromagnetics
Two inverse problems in electromagnetics are investigated in this thesis. The first is the retrieval of the effective constitutive parameters of metamaterials from the measurement of the reflection and the transmission coefficients. A robust method is proposed for the retrieval of metamaterials as …
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Applications of low-rank approximation: complex networks and inverse problems
… This survey is addressed with the aid of electromagnetic induction measurements taken with a ground conductivity meter. Starting from electromagnetic data collected by this device, the electrical conductivity profile of the soil is reconstructed with the aid of a regularized damped …
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Using Geophysics To Evaluate Levee Stability
… and the second site is a potential slide area. Electromagnetic induction and electrical resistivity tomography were the geophysical methods used to define subsurface conditions that make a levee vulnerable to failure. These electrical methods are sensitive to the electrical conductivity of the …
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Applications of time series analysis to geophysical data
… (4.25-4.35 km/s) to depths of 40-50 km. The electromagnetic induction fields at a deep ocean site northeast of Hawaii were used to determine the electrical conductivity of the earth to 400 km depth. Singular value decomposition of the data matrix indicates three degrees of freedom, suggesting …
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Numerical methods for electromagnetic wave propagation and scattering in complex media
… are developed to study various applications in electromagnetic wave propagation and scattering. Analytical methods are used where possible to enhance the efficiency, accuracy, and applicability of the numerical methods. Electromagnetic induction (EMI) sensing is a popular technique to detect and …
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