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 1345 for “"Low-Frequency"”.
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Low Frequency Biasing
Die Elektrocochleographie (EcoG) ist eine der vielversprechendsten Methoden, cochleäre Dysfunktionen mit objektiver Diagnostik zu verifizieren. Erweitert durch das Prinzip des Biasings, also der gleichzeitigen Präsentation von Testtönen in einen niederfrequenten 52-Hz-Sinusdauerton, läßt sich die …
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Low frequency indoor radiolocation
… of a building. It is shown that this "mid-field" frequency regime can provide useful propagation characteristics with very little fixed infrastructure. Using a wavelength of 150m, over 4000 amplitude and differential carrier phase measurements were taken in the Wiesner Building. Least-squares …
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Low-Frequency Subsurface Electromagnetic Modeling
… media, and (3) a systematic approach to solving low-frequency scattering problems using the method of moments (MOM). These methods provide important modeling tools for the subsurface exploration.
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Low Frequency Microscale Energy Harvesting
… provides the best output power density at low frequencies as compared to the other possible mechanisms for vibration energy harvesting (VEH). However, piezoelectric-based VEH presents a fundamental challenge at the micro scale since the resonance frequency of the structure increases as the …
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Low frequency plasma waves at Mars
… has returned over eight years of observations of low frequency plasma waves produced in the interaction of the solar wind with the Martian ionosphere. Using the MAG/ER data, I identify the properties and physical origins of the waves in the magnetosheath, magnetic pileup region, and ionosphere. I …
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Low-Frequency Variability in the Stratosphere
… realistic time mean state, and we have observed low frequency variability (LFV) in the stratosphere with timescales on the order of hundreds of days. Time lagged correlations have revealed that this variability is linked to LFV in the emission of longwaves from the troposphere. A set of linear …
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Low frequency charge-density wave dynamics
The low frequency dynamics of the charge-density waves in NbSe$\sb3$ and TaS$\sb3$ were investigated using low frequency conductance fluctuations. Simultaneous measurements of the fluctuations in the voltage and the differential resistance revealed a theory of threshold voltage fluctuations can …
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Low-Frequency Sonophoresis Assisted Cancer Immunotherapy
… a short 30 second pretreatment of the skin with low-frequency ultrasound, also known as low-frequency sonophoresis (LFS), followed by topical ovalbumin antigen application, results in the induction of a potent CTL response in the absence of any co-administered adjuvants. LFS is a minimally …
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Spectral description of low frequency oceanic variability
… provide an approximate spectral description of low frequency oceanic variability. Such a spectrum has wide application in oceanography, including the optimal design of observational strategy for the deployment of floats, the study of Lagrangian statistics and the estimate of uncertainty for heat …
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Low frequency ac transmission for power systems
… not flexible for multi-terminal connection. The low frequency ac (LFAC) transmission system, first introduced in 2000, is another solution for bulk power transmission that inherits advantages from both high voltage ac and high voltage dc systems. The primary advantage of LFAC transmission is that …
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Low-Frequency Series Loaded Resonant Inverter Characterization
… mainly attributed to a load dependent resonant frequency. Recent advancements in power electronics propose an electronically tunable inductor suited for low frequency applications [24], [25]; as a consequence, frequency stability in resonant inverters is achievable within a limited load range. …
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Barotropic Model Simulations of Low-Frequency Variability
… that forcing is necessary in maintaining the low-frequency variability in the barotropic system under subcritical condition. Stochastically forced experiments are conducted using spatially homogeneous forcing. In the weakly subcritical cases, the model produces spatially and temporally …
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Studies on Low Frequency Fast Multipole Algorithms
The low frequency breakdown problem of MLFMA is studied in the second part. A low frequency fast inhomogeneous plane wave algorithm (LF-FIPWA) is developed to overcome this issue with the transition region around 0.1 wavelength. Evanescent waves and propagating waves are both used to compensate for …
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Unsupervised disaggregation of low frequency power measurements
… several unsupervised disaggregation methods on low frequency power measurements collected in real homes. Specifically, we consider variants of the factorial hidden Markov model. Our results indicate that a conditional factorial hidden semi-Markov model, which integrates additional features …
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A low frequency underwater sound propagation model
All wave-theoretic underwater sound propagation models attempt to derive the acoustic field originating from a sound source in a specific environment by either solving the wave equation directly or by solving an approximation there-of. This dissertation describes a normal mode direct solution with …
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Spectral description of low frequency oceanic variability
… provide an approximate spectral description of low frequency oceanic variability. Such a spectrum has wide application in oceanography, including the optimal design of observational strategy for the deployment of floats, the study of Lagrangian statistics and the estimate of uncertainty for heat …
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Low frequency array performance in shallow water
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1963.
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