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 40 for “"Noise Spectrum"”.
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Dynamics of Small Elastic Systems in Fluid: Tension and Nonlinearity
… and in water. For the stochastic dynamics, the noise spectrum describes the thermal fluctuations at a given frequency. The theoretical model provides an analytical expression for the noise spectrum from an arbitrary number of modes. The noise spectrum of the first eleven modes are computed, and …
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Digital signal processing analysis of switched capacitor filters
… in both discrete-time design implementation and noise analysis. Basic principles of switched capacitor integration/summation networks and their interfacing is first presented. A review of fundamental discrete-time system design techniques which are, and can be, adopted in the design of switched …
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The Stochastic Dynamics of Optomechanical Sensors for Atomic Force Microscopy
… spot size of the laser. This work determines the noise spectrum G of a nanobeam in water and in air. Also important diagnostics of the nanobeam are determined in air and in water. These important diagnostics include the quality factor Q and natural frequency in fluid omega_f. It is found that the …
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A multi-mode spectrometer for atomic emission spectrometry
… of source fluctuation and redistributed photon noise can be reduced. In addition, the MMS has unique capabilities in data compression, application of internal standards, and noise spectrum analysis.
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Non-intrusive noise measuring on a television picture using spectrum analysis
… to develop a new measuring technique to measure noise on a television picture non-intrusively. Existing methods measure noise intrusively by injecting test signals into the system or using techniques which make use of lines outside the picture area. From a system point of view one may assume no …
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Dynamics of frustrated magnetic systems – Emergent fractals and anomalous magnetic noise in spin ice
… the magnetic relaxation time and the magnetic noise spectrum. Several independent experiments, some dating back over two decades, have found that the magnetic relaxation time in these materials diverges rapidly upon cooling – more rapidly than what any previous theory can explain without …
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Digital noise reconstruction with a quantum sensor
… Thus, probing and characterizing environmental noise is an essential task for both fundamental physics and quantum applications. Existing noise reconstruction methods in quantum systems rely on using approximated delta-like frequency filtering to sample the noise spectrum in frequency domain …
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Implementation of side-fringe locking in an SHG cavity
… such long-term power fluctuations and that the noise spectrum is comparable to PDH locking-explained largely due to PZT noise length fluctuations off-resonance..
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An experimental and analytical study of noise production and propagation in burners
… causes low frequency broadband combustion noise. Before the noise from such burners can be reduced, the generating mechanisms must be understood. Noise generation by a simple can-type burner has been investigated. Several parameters are varied to study their effect on the far-field noise …
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Ambient noise and surface wave dissipation in the ocean
… waves is responsible for much of the ambient noise level in the ocean. While numerous field measurements have shown a strong correlation between the ambient noise spectrum level (N) in the range 100Hz to 25kHz and wind speed in the ocean, very little has been done to establish a comparable …
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SYNTHESIS OF LINEAR MULTIVARIABLE FEEDBACK SYSTEMS IN INFINITE INDEX NORM
… on the precision of plant parameters and the noise spectrum. The robustness problem can be formalized in singular value analysis. With the help of operator theory a new method for the synthesis of linear multivariable feedback systems in H(,(INFIN)) norm is developed from the singular value …
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Predictions and observations of seafloor infrasonic noise generated by sea surface orbital motion
… for the prediction of the seismo-acoustic noise spectrum in the microseism peak region (0.1 to 0.7 Hz). The model uses a theory developed by Cato [J. Acoust. Soc. Am., 89 , 1096-1112 (1991)] for an infinite depth ocean in which the surface orbital motion caused by gravity waves may produce …
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Toward quantum opto-mechanics in a gram-scale suspended mirror interferometer
… oscillator. Then we analyze the displacement noise spectrum in the gram-scale system, which is currently limited by thermally driven fluctuations of the mirror suspensions. We identify methods for improving the suspension, in order to reveal the quantum fluctuations attributable to back-action …
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Interferometric experiments towards advanced gravitational wave detectors
… increase in their sensitivity to their limiting noise sources. Two critical noise limits that must be characterised, understood, and hopefully reduced for the benefit of future detectors, are thermal noise (from mirror substrates, reflective coatings and suspension systems) and photon noise -- …
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Great Fool: Six Poems of Ryōkan for Tenor and Orchestra
… technique first creating pitch, then unstable noise-spectrum, then pitch again. As we zoom out there is a version of the same motion in which the entire section of instruments performs a state-change so it is the massed sound itself that changes over the course of five seconds, or thirty …
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Coherence characterization with a superconducting flux qubit through NMR approaches
… time. This technique is further utilized as a noise spectrum analyzer in the megahertz range, by which a 1/f-type dependence is observed for the flux noise. Then, a novel method of performing low-frequency noise spectroscopy is developed and successfully implemented. New techniques used in the …
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FABRICATION AND CHARACTERIZATION OF ACTIVE NANOSTRUCTURES
… The levels and origin of low-frequency noise in junctionless transistor devices fabricated from silicon nanowires and also from GeOI devices are reported. Low-frequency noise is an indicator of the quality of the material, hence its characterization can reveal the quality and perhaps …
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Modeling and Analysis Methods for ESD and EMI Problems
… methodology is presented to analyze the acoustic noise created by MLCCs on a PCB. A simulation model for the PCB vibration modal response is built to analyze the harmonic response of the PCB excited by the capacitor. Total response is obtained by multiplying the measured power noise spectrum on …
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Active Minimization of Acoustic Energy Density to Attenuate Radiated Noise from a Diesel Generator
The focus of this thesis was to use active noise control (ANC) to globally minimize the tonal and broadband noise radiating from a diesel generator enclosure. The major goal of this research was to show that minimizing the noise within the enclosure can lead to an overall sound pressure level (SPL) …
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Transport in nanoscale systems
… The model proposes a particular power law noise spectrum that is found to be consistent with experiments. In Part II of the Thesis novel effects in Carbon nanotubes are predicted. These effects can be manifest in transport measurements. First, it is shown that a strong electric field …
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