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 20 for “"Spectral representation"”.
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Pitch period segmentation and spectral representation of speech signals
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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The analytic properties of the triangle and box diagram amplitudes
… amplitude is transformed directly into a single spectral representation in the Mandelstam variable t . In this way, the different forms of the spectral representation, the weight functions and the thresholds are obtained directly for all possible mass configurations involving stable external …
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The analytic properties of the triangle and box diagram amplitudes
… amplitude is transformed directly into a single spectral representation in the Mandelstam variable t . In this way, the different forms of the spectral representation, the weight functions and the thresholds are obtained directly for all possible mass configurations involving stable external …
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Bidirectional and unidirectional spectral representations for the scalar wave equation
… of the bidirectional and unidirectional spectral representations. These two novel methods for synthesizing wave signals are distinct from the superposition principle underlying the conventional Fourier method and they can effectively be used to derive a large class of localized solutions …
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Elasticity in Microstructure Sensitive Design Through the use of Hill Bounds
… sensitive design introduces a common language, a spectral representation, where both design properties and microstructures are expressed. <p>Using Hill bounds, effective elastic properties are expressed within the spectral representation. For the elastic properties, two FCC materials, copper and …
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New Model And Simulation Algorithm Of Nonstationary Non-gaussian Ground Motions Based On S-transform
… represented by time-frequency (dependent) power spectral density (TFPSD) and coherence functions. The assessment of such power spectral density and coherence functions are presented by using historical records and the S-transform – a Fourier transform with time localized and frequency-dependent …
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Relaxing Topological Barriers in Geometry Processing
… simulation. We bring together frame fields with spectral representation of geometry. We use current relaxation to devise a new neural shape representation for surfaces with boundary as well as a convex relaxation of field optimization problems featuring singularities. Unifying these disparate …
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Passenger comfort during formation flight within atmospheric turbulence
… human body to vibrations is frequency dependent, spectral representation of atmospheric turbulence was incorporated. Monte Carlo simulations were done for various levels of turbulence intensity.
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Exploiting pitch dynamics for speech spectral estimation using a two-dimensional processing framework
… addresses the problem of obtaining an accurate spectral representation of speech formant structure when the voicing source exhibits a high fundamental frequency. Our work is inspired by auditory perception and physiological modeling studies implicating the use of temporal changes in speech by …
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Influence of base isolation on the response of structures to earthquakes
… domain using a stationary Clough-Penzien spectral representation for the ground excitation. Standard deviations of the structure’s generalized coordinates and their second derivatives are obtained, which characterize the response, including stresses, of the structure. The effectiveness of …
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Numerical simulation of optical wave propagation through random media
… wave-kinetic numerical method and/or the angular-spectral representation of the Huygens-Fresnel diffraction formula are used. For the wave-kinetic numerical method, several different levels of approximations are introduced, and the region of validity of those approximations is studied by …
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Electron Removal Processes in Proton-Methane Collisions
… Similar to a previous work, we have used a spectral representation of the molecular Hamiltonian and a single-centre expansion of the initially populated molecular orbitals. The two-centre basis gen- erator method is then used to solve the time-dependent single-particle Schr ̈odinger …
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Object Oriented CAE Software for the Exploration and Design of Microstructures
… generalized spherical harmonic basis functions a spectral representation is used to model the microstructure of cubic materials. This model is then used to predict the macroscopic elastic and plastic properties of materials with cubic crystal symmetry and various sample symmetry including …
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Dynamic delamination of patterned thin films
… a numerical scheme based on the combination of spectral representation of the elastodynamic solutions for the substrate and finite element model for the thin film. Cohesive elements are introduced along the bi-material interface to capture the decohesion process. The important role of the …
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Resonance in dispersive wave systems
… regimes. A direct multiple scale analysis of the spectral representation of a model equation containing arbitrary linear dispersion and weak quadratic nonlinearity was conducted. Consequently a system of "three wave" equations analogous to those for simple resonances was derived for the double …
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Modeling and Simulation of Random Processes and Fields in Civil Engineering and Engineering Mechanics
… depends on this inversion, when following a spectral representation based approach. This work first examines the existence and uniqueness of such an inversion from the ACF to the ES under a set of special conditions and assumptions (since such an inversion is clearly not unique in the most …
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The benefits of acoustic input to combined electric and contralateral acoustic hearing
… in performance was likely due to the improved spectral representation of the first formant. The aims of Experiments 2 and 3 were to investigate the underlying psychophysical mechanisms of the contribution of the acoustic input to electric hearing. Temporal Modulation Transfer Functions (TMTFs) …
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Encountering spectral traces: ghost narratives in Chinese America and Taiwan
… as the supernatural and social embodiments. The spectral representation goes beyond the public perception and reception of the phantom other, thereby delivering the senses of the fearful and the uncanny. Besides, haunting is related to the attachment to and detachment from the earthly world, and …
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Regionally adaptable ground-motion Prediction Equations (GMPEs) for seismic hazard analysis
… the GMPEs are often derived for response spectral ordinates (e.g., spectral acceleration) of a single degree of freedom (SDOF) oscillator. The functional forms of such GMPEs are based upon the concepts borrowed from the Fourier spectral representation of ground motion. This assumption …
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Task-specific summarization of networks: Optimization and Learning
Networks (also known as graphs) are everywhere. People-contact networks, social networks, email communication networks, internet networks (among others) are examples of graphs in our daily life. The increasing size of these networks makes it harder to understand them. Instead, summarizing these …