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 60 for “"Noise Characteristics"”.
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Noise characteristics of the fiber ring lasers
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Investigation of refrigerant flow-induced noise characteristics and mitigation approaches
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Designed Reduction of Radiated Noise Characteristics from Two-Bladed General Aviation Propellers
… has made the reduction of environmental noise pollution a top priority for the aviation industry. Utilizing current technology, this study examines the reduction of noise generated by two bladed general aviation propellers, through design. The Aircraft Noise Prediction Program - Propeller …
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Three-Bladed Propeller Design for the Reduction of General Aviation Radiated Noise Characteristics
… analytical predictions using the NASA Aircraft Noise Prediction Program - Propeller Analysis System (ANOPP-PAS) was used to achieve this goal. The propellers were designed for an engine power of 200 hp, a rotational speed of 2,400 RPM and a free-stream speed of 160 kts. A straight 76 in. …
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A Study of Narrowband Noise Characteristics Associated with Vortex Motion in High Temperature Superconductors
… To investigate their motion, voltage noise generated by moving vortices is studied for different material defect types using a nonequilibrium Metropolis Monte Carlo simulation. The current-voltage (I-V) characteristics obtained from the simulation for various vortex densities and …
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A comparison of signal-to-noise characteristics : Fourier transform enhanced magnetic rotation spectroscopy and dispersive spectrometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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An analysis of noise in the NOvA near detector
… using the NOvA experiment background signals and noise must be understood and characterized. The work described is a study of noise characteristics from the electronics and photosensors used in the near detector of the NOvA experiment. A number of methods for the identification and elimination of …
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Physics-based aeroacoustic modelling of bluff-bodies
… this work physics-based modelling of bluff-body noise was performed with application to landing gear noise production. The landing gear is a primary contributor to airframe noise during approach. Noise is primarily generated from the unsteady pressures resulting from the turbulent flow around …
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Low-cost educational stochastic optical reconstruction microscopy (eSTORM)
… Since lower cost also comes with higher noise, we characterized the optical and noise characteristics of the microscope. A new sample protocol, consisting of microspheres labeled with streptavidin-Alexa 647 conjugates, was developed to test the system, compare the image quality of two …
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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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Single mode excitation in the shallow water acoustic channel using feedback control
… a single mode with given array geometries, noise characteristics and source power limitations. Simulations and laboratory waveguide experiments indicate the proposed algorithm holds promise for ocean experiments.
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Adaptive Extended Kalman Filtering Strategies for Autonomous Relative Navigation of Formation Flying Spacecraft
… filters are capable of updating the internal noise characteristics of the Kalman filter in real time, and are viable in all orbit scenarios, including highly elliptical orbits in the presence of perturbations. The first Kalman filter approach uses maximum likelihood estimation techniques to …
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Power line communications systems
… connection by measuring its propagation characteristics. For power line communication to become efficient, a model of their behaviour at frequencies from 0 to 30 MHz is required. The attenuation and phase response are of particular interest. In this project, indoor cables within a …
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Design and characterization of the measurement electronics for a magnetic induction tomography imaging system
… actual MIT system could then be assessed. The noise characteristics and stability of the system were also characterised. A complete eight channel MIT measurement system is presently being assembled based on the prototypes presented in the dissertation. The results obtained from the experiments …
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Octave-spanning lasers for optical metrology applications
… study of the carrier-envelope phase dynamics and noise characteristics of octave-spanning Ti:sapphire lasers is presented. We model the effect of the laser dynamics on the residual carrier-envelope phase noise by deriving a transfer function representation of the octave-spanning frequency comb. …
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Characterization of a Phased Array Feed Model
… of the PAF requires modeling the signal and noise characteristics of the array, which is a computationally large problem. It also requires accurate modeling of the noise contribution of the receivers connected to the coupled array, which is something that has only recently been understood. …
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Gallium Nitride-Based HEMT Devices Modeling and Performance Characterization
… applications due to its high power and low noise characteristics at such frequencies. As a result of improved material growth and processing technologies, microwave power densities have been demonstrated in AlGaN/GaN HEMTs that are five to ten times greater than that of corresponding …
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Hardware and software considerations for monocular SLAM in a riverine environment
… reflections are likely to be found. A process noise model is proposed to more accurately reflect the noise characteristics of the inertial measurement unit. The dataset used for the experiments was collected from a canoe on the Sangamon River covering 2.7 kilometers in 44 minutes and divided …
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DC powerline communication system using a transmission line transformer for high degree of freedom applications
… DC power bus provides amenable and predictable noise characteristics and desirable impedance characteristics that allow for large fanout and high bandwidth. First the basic architecture of DC powerline communication is presented, followed by verification of the feasibility of using a DC power …
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Radiation damage effects in charge coupled devices
… work is also relevant to other small signal, low noise applications. The results of the batch qualification are presented and the data base of ionising radiation effects on EEV CCDs has been extended to include the effects of irradiation whilst clocking at 180K. Particular attention has been aimed …
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