# Browse by Subject "Physics, Acoustics"

• (1968)

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• (1993)
The propagation of acoustic waves in porous media is of interest in a variety of areas, including oil well logging, the seepage of contaminants into ground water supplies, and the flow of fluids in packed beds. The aim of ...

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• (1991)
Low intensity ultrasound (approximately 10$\sp{-6}$ W/cm$\sp2$) in the frequency range of 0.5 MHz to 5.0 MHz was employed to investigate biomembrane structural relaxation kinetics via absorption and velocity dispersion ...

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• (1989)
The simultaneous presentation of several sound sources in a performance setting is fundamental to most music. Ensemble musical signals consist of superpositions of multiple distinct sonic events which may or may not be ...

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• (1992)
This dissertation studies aspiration in Chinese in these four areas: the temporal relationships between aspiration and the vowel of the syllable, the perception of aspiration, the correlation between pitch and aspiration, ...

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• (1991)
An asymptotic description of the acoustic signature of a crack, breaking the surface of an otherwise homogeneous, isotropic elastic material, determined using either a line focus or a point focus scanning acoustic microscope ...

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• (1990)
One of the major limitations of hyperthermia as a cancer treatment modality is the lack of heating equipment and techniques capable of consistent therapeutic heating of deep-seated tumors. This thesis introduces a new ...

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• (1992)
The boundary integral equation/boundary element method (BIE/BEM) has emerged as a powerful alternative tool to other numerical methods for many problems in engineering. The hypersingular BIE's, which are derivatives of ...

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• (1990)
This study has concerned the propagation of finite amplitude, i.e. weakly non-linear, acoustical blast waves from explosions over hard and porous media models of outdoor ground surfaces. The nonlinear acoustic propagation ...

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• (1988)
This research investigates two aspects of the time-varying vibration patterns of plucked string tones of classical guitar, Chinese pipa and Chinese ch'in. First, the assumption that horizontal and vertical frequencies and ...

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• (1993)
Numerical studies of the ensemble average, or coherent, wave in a two-dimensional random medium have been undertaken for the steady-state and transient cases. The medium consisted of a tensioned mesh with a uniform ...

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• (1984)
It is well-known that materials exhibit a decrease in compressibility when subjected to high compression. This decrease in compressibility may be described by the nonlinearity parameter B/A. Organic liquids have been shown ...

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• (1992)
A numerical study of Anderson localization in two dimensions and a laboratory study of weak localization in three dimensions are presented. The two-dimensional study was performed by mathematically modelling a system of ...

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• (1992)
A new field/voltage relation for use with the symmetric condensed node transmission line matrix (TLM) method is introduced. It is found that there is no rigorous mathematical proof which demonstrates the consistency and ...

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• (1994)
Radiative transfer theory is used to model the multiple scattering of diffuse ultrasonic waves in two types of random media. The first type is an isotropic, homogeneous medium containing randomly oriented, randomly located ...

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• (1990)
In Fourier synthesis, natural musical sounds are produced by summing time-varying sinusoids. Sounds are analyzed to find the amplitude and frequency characteristics for their sinusoids; interpolation between the characteristics ...

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• (1995)
Scattering from an imperfect planar interface between two different elastic media was studied to examine how the signals induced at the transducers by reflected, transmitted and scattered waves are related to the interface ...

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• (1992)
The methods presented in this thesis were developed to study the electron propagation in nanostructures with special emphasis on semiconducting materials. The essence of nanometer-scale physics is in the phase coherence ...

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