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 808 for “"frequency domain"”.
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Acoustic Frequency Domain Reflectometry
Acoustic Frequency Domain Reflectometry (AFDR) is a novel technique employing frequency modulated continuous wave (FMCW) methods in solid acoustic waveguide reflectometry. It is particularly suited to dispersion compensation and phase compensation due to the measurement domain being the frequency …
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Frequency domain secondary pulse estimation
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Robustness in Feedback Systems (Frequency Domain)
The research in this dissertation is motivated by the basic question "What can and cannot be accomplished by feedback control?" In particular, this dissertation shall address three basic issues: (a) Determining which types of controllers are optimal for certain classes of control problems, (b) …
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Frequency-domain deconvolution in deep learning
… to deep learning in computer vision tasks: the frequency-domain deconvolution operation. Recognizing the unparalleled success of convolutional neural networks (CNNs) in the realm of computer vision, we critically evaluate the performance and computational demands of traditional convolution …
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Electricity Load Modeling in Frequency Domain
… system analysis, this dissertation introduces a frequency domain load profile modeling framework. This framework can be used a complementary technology alongside of the conventional time domain load profile modeling techniques. There are three main components in this framework: 1) the frequency …
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Frequency Domain Ultrasound Waveform Tomography Breast Imaging
<p>Ultrasound tomography is an emerging modality for imaging breast tissue for the detection of disease. Using the principles of full waveform inversion, high-resolution quantitative sound speed and attenuation maps of the breast can be created. In this thesis, we introduce some basic principles of …
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Frequency domain approach to self-force calculations
… of orbits. Our approach is to work in the frequency domain, fully decomposing the scalar field into spheroidal harmonic and frequency modes and numerically solving for the retarded field mode-by-mode. Regularization of the retarded field is performed using the standard mode-sum technique …
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Analyzing lakes in the time frequency domain
… is to demonstrate the benefits of innovative frequency-based methods to better explain the variability observed in lake ecosystems. Freshwater ecosystems may be the most threatened part of the hydrosphere. Lake ecosystems are particularly sensitive to changes in climate and land use because …
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Frequency-domain modelling of floating wind turbines
… system. In this thesis a linearised frequency-domain approach is developed which gives fast but approximate results: linearised models of the structural dynamics, hydrodynamics, aerodynamics and control system dynamics are brought together to find the overall response of the floating …
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Frequency domain quantification of manufacturing process resolution
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993, and Thesis (M.S.)--Sloan School of Management, 1993.
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Frequency domain model-based intracranial pressure estimation
… availability of this vital sign. We present a frequency-domain approach to ICP estimation using a simple lumped, linear time-invariant model of cerebrovascular dynamics. Preliminary results from 28 records of patients with severe traumatic brain injury are presented and discussed. Suggestions …
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Time-frequency domain modelling for ultrasonic nondestructive testing
… transform allows for retention of both time and frequency domain information simultaneously and permits the in homogeneous wave equation (with a forcing function prescribed as a linear chirp modulated by a Gaussian envelope) to be solved in time-frequency space. This in turn facilitates a …
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Frequency Domain Identification of Block-oriented Nonlinear Systems
… thesis deals with a frequency domain approach to identifying a particular class of nonlinear systems which can be modelled by the Volterra series. The methodology is based on the application of specially designed multisine test signals which allow second and third …
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Supplementing Frequency Domain Interpolation Methods for Character Animation
… involves interpolation between motions in the frequency domain, with a blending space defined by a triangle network whose vertices represent input motions. It is this branch of character animation which is supplemented by the methods presented in this thesis, with work undertaken in three …
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Development of a frequency-domain electromagnetic scattering measurement system
… the development of a system for measuring frequency-domain scattered fields in the Transient Electromagnetic Scattering Range at the Naval Postgraduate School. The new system employs a stepped- frequency Cw waveform and utilizes an HP-8510B network analyzer as an RF front- end and a …
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Time and frequency domain modelling of the piezoelectric transducer
A new model for piezoelectric ultrasonic transducers is proposed. Using a systems engineering approach, the concept of feedback is used to explain secondary piezoelectric effects and to clearly describe electro-mechanical interaction. The model is derived from the fundamental piezoelectric …
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Frequency-Domain Near-Infrared Spectroscopy in the Human Brain
Monitoring brain tissue oxygen supply, demand, delivery and consumption can be achieved by quantifying the absolute values of oxy- and deoxy-hemoglobin and how these quantities change over time during rest, functional activation, pathology, and disease. My dissertation describes the development, …
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Optical frequency domain imaging of human retina and choroid
… a new ophthalmic imaging method, termed optical frequency domain imaging (OFDI), to overcome these limitations. Preliminary imaging of the posterior segment of human eyes in vivo was performed to evaluate the utility of this instrument for comprehensive ophthalmic examination.
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Investigation of Anisotropic Heat Transport Through Frequency Domain Thermoreflectance Technique
… heat transport in anisotropic materials through frequency domain thermoreflectance (FDTR) technique. Firstly, I describe the experimental setup and numerical modeling of the FDTR. Then, I explain the development of beam offset frequency domain thermoreflectance (BO-FDTR) and frequency domain …
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