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 47 for “"Wave attenuation"”.
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Blast wave attenuation using liquid sheets
Strong blast waves, such as those associated with gun fire or rocket exhausts, can cause serious physiological and/or structural damage. It is necessary, therefore, to develop ways in which to minimise this damage whilst still allowing the system that produces the blast waves to function normally. …
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Using wave attenuation techniques for monitoring of stress levels
… least destructive means of stress measurement. Wave propagation velocity has long been applied to the investigation of the upper mantle and crust stress. Recently, it has also been applied to rock burst prediction and mine site investigations. Another parameter for investigating stress in rocks …
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Seismic-wave attenuation and the state of the upper mantle.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1971.
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Three-Dimensional Analysis of Wave Attenuation by Anchored Hemicylindrical Shell
… and the dynamic response of the structure in waves are obtained as a function of the wave number. Two different water depths of 5 m and 6 m are considered. For each water depth, normal and oblique incident waves are considered. The free surface elevation in front of and behind the structure is …
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A Parameterized Approach to Estimating Wave Attenuation from Living Shorelines
… shape, and structural characteristics, but the wave environment in which they exist can be quiescent or extreme. The work presented in this paper explores the hydrodynamic effects of living shoreline features in such a way that can be generalized across a range of varying physical environments. …
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Q Models for Lg Wave Attenuation in the Central United States
… provide a unique opportunity to study attenuation of the Lg phase in the mid-continent and Gulf Coastal region. The TA data reveal previously unrecognized regional variability of ground motion propagation in the central United States. A study of the Fourier amplitude spectra shows the …
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Teleseismic P Wave Attenuation in the Upper Mantle Beneath the United States
… by EarthScope™'s Transportable Array, the P wave amplitude spectra were analyzed to examine seismic attenuation patterns in the upper mantle. 2.5 million inter-station P wave spectral ratios were inverted for maps of relative t* variations across the United States in multiple frequency bands …
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Seismicity, earthquake mechanisms, and seismic wave attenuation in the northeastern United States
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Experimental study on the response of fine sediments to wave agitation and associated wave attenuation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989.
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Nature based solutions for coastal defense: Wave attenuation and economic analysis of marsh-fronted seawalls
… and urban coastal protection. A one-dimensional wave attenuation model was developed using first principles to capture four mechanisms that impact wave evolution: Wave breaking, vegetation drag, shoaling, and bed friction. In particular, the vegetation drag was modeled using the stem and leaf …
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An investigation of the influence of grain size on stress wave attenuation and dispersion in rock like materials
… linear network theory is developed to describe attenuation and dispersion in a medium. The assumption is made that the ll medium behaves in a linear manner. The influence of grain size on attenuation and dispersion is investigated and the effect of aggregate to matrix ratio also is considered. …
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Numerical simulation and modelling of the effect of film cooling on entropy noise in a stator blade row
… of how film cooling flows interact with entropy waves, and their influence on entropy noise generation. A 2D numerical framework has been developed for preliminary understanding of the problem, and then analysis of the effect of film cooling on the entropy noise generation and entropy wave …
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Lattice Based Elastic Metamaterials with Ultra-wide Stopbands at Low Frequency
… of EMMs is the bandgap, in which elastic waves， within specific frequency ranges are prohibited from transmitting. While putting EMMs into use in real-life applications, nonetheless, their applicability remains limited due to the deficiency in the well-established design methods for EMMs, …
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Sn attenuation in the Northeast China
… collision. In this thesis a study of seismic wave attenuation characterized from regional earthquakes in northeast China is presented. Regional phase Sn wave is used to map lateral variations of shear wave Q. This method allows us to measure, in some detail, to map the effective shear wave …
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Dynamic Behavior of Sandwich Beams With Internal Resonators
… theoretically analyzed and it was shown that a wave attenuation bandgap exists due to local resonance. Steady state experiments were used to demonstrate such an attenuation bandgap. Frequency response functions were obtained for a beam with resonators and without resonators. It was shown that …
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Wave Mechanics in Constructed Oyster Reefs and the Design of Nature-Based Coastal Adaptation
… most projects to-date are designed primarily for wave attenuation and fail to consider both the environmental conditions necessary for long-term oyster reef sustainability as well as the importance of education and outreach in fostering environmental stewardship. Realizing the promise of …
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Stress Wave Scattering in Concrete: An Investigation Through Simple Finite Element Models
… to estimate the scattering component of stress wave attenuation in concrete and concretelike materials through the use of simple finite element models in two dimensions. The method employs a correction to account for losses due to normal radiation pattern effects and test setup geometry. Among …
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Methods of Diffusing Pulse Detonation Combustion
… higher pressure and temperature gain across the wave front compared to the comparable deflagration. Since a detonation is a supersonic event which uses a shock to compress and dissociate reactants, a Pulse Detonation Combustor (PDC) is a relatively simple device that does not necessarily require …
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