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 36 for “"Propagation Velocity"”.
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Measurement of ultrasonic propagation velocity in gases
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1953.
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Measurement of a Neutron Pulse Propagation Velocity in a Homogeneous Mediuim
Made available in DSpace on 2017-07-06T18:48:19Z (GMT). No. of bitstreams: 2 Guyot_Jean_C_MS.pdf: 16806523 bytes, checksum: 311bbfaa131263f4d04a039a5bee8bac (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1964
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Quantitative Hydrodynamics Analysis of Left Ventricular Diastolic Dysfunction using Color M-Mode Echocardiography
… health and demonstrated that the filling wave propagation speed is a significant index of the severity of diastolic dysfunction. However, the governing flow physics underlying the relationship between propagation speed and diastolic dysfunction are poorly understood. More importantly, currently …
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Interplay between background turbulence and Darrieus-Landau instability in premixed flames via a model equation
… the flame surface, leading to an increase in the propagation velocity. Scaling laws are proposed for the increase in propagation velocity with variations in noise intensity and a bifurcation parameter, which includes the effects of parameters such as the domain size, equivalence ratio and reaction …
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Automatic multicomponent image registration
… upgoing wavefields. Each wave mode has different propagation velocity and polariza- tion direction and thus carries unique, direction-dependent information about the subsurface. Differences in propagation velocity cause events in converted- or shear-wave images to appear at later times than the …
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Nanoengineered surfaces for advanced thermal management
… model was developed to predict the propagation velocity based on Modified Washburn's Model to optimize propagation of the liquid. The results were validated by measurements of liquid propagation velocity on micropillar arrays with various geometries.
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The functional role of the mammalian tectorial membrane in the cochlear mechanics
… modulus and shear viscosity of the TM from the propagation velocity of the waves and show that segments of the TM from the basal turn are stiffer than apical segments are. Analysis of loading effects of hair bundle stiffness, the limbal attachment of the TM, and viscous damping in the …
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The bending effect in turbulent flame propagation
In the present thesis, the sensitivity of flame propagation to the turbulent motion of burning gases is investigated. The long-standing issue of the 'bending effect' is focused upon, which refers to the experimentally-observed inhibition of flame propagation velocity at high intensities of …
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Radar observations of field-aligned plasma propagations associated with NASA's PMG experiment
… and tracking data of PMG's orbit, the effective propagation velocity of these traveling plasma waveforms was calculated to be of the order of 1000 meters per second. Detection of these disturbances, associated with PMG's passage overhead, supports the existence of a phantom current loop allowing …
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Using wave attenuation techniques for monitoring of stress levels
… 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 is …
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Earthquake behavior and structure of oceanic transform faults
… characteristics consistent with the rupture propagation velocity of shallow aseismic creep transients. I also develop new thermal models for the ridge-transform fault environment to estimate the spatial distribution of earthquakes at transforms. Assuming a temperature-dependent rheology, …
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Earthquake behavior and structure of oceanic transform faults
… characteristics consistent with the rupture propagation velocity of shallow aseismic creep transients. I also develop new thermal models for the ridge-transform fault environment to estimate the spatial distribution of earthquakes at transforms. Assuming a temperature-dependent rheology, …
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Propagation of energetic electrons in the solar corona observed with LOFAR
… 16, 2016 by LOFAR shows a nonuniform radial propagation velocity of the radio emission. The analysis of an imaging observation of type III bursts on June 23, 2012 resolves a burst as bright, compact region localized in the corona propagating in radial direction along magnetic field lines with …
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Solution of strained edge flames by a boundary value method
… and strain rate on edge flame structure and propagation velocity for variable-density flows. Previous studies observe that the ratio of the edge flame speed to the premixed stoichiometric laminar flame velocity scales approximately as the square root of the ratio of the cold stream density to …
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Anisotropic dewetting in ultra-thin single-crystal silicon-on-insulator films
… model. We also quantify the edge dewetting front propagation velocity in SOI and determine that it depends on the negative third power of the film thickness, agreeing with the prediction of Jiran and Thompson and with our model.
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A Procedure To Develop Scalable Reduced Models For The Transient Response of Sleepers In Conventional And High-speed Railway Lines.
… parameters are introduced: (i) the apparent propagation velocity, (ii) the geometric damping coefficient, (iii) soil properties of a reference soil (i.e., the shear modulus and shear wave velocity). The models are validated through comparisons with other BEM solutions, and the accuracy and …
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The computer simulation of quenching in superconducting magnets
… a magnet can be modelled using the concept of a ’propagation velocity’ which defines how fast the normal region spreads throughout the magnet. A review of currently-available quench simulation software, much of which uses this approach, is then presented. Modifications are made to one such …
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An investigation of the dynamic stalling characteristics of rotating axial-flow compressor blades
… physical mechanisms which control the onset and propagation velocity of a rotating stall in a single-stage compressor can be modeled with the use of a transfer function in a semi-actuator disc model of the compressor. The transfer function represents the dynamic characteristics of the compressor …
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History Induced Critical Scaling in Disordered Media and Super Diffusive Growth in Highly Advective Random Environments
… in the direction perpendicular to the convection velocity. A time characterizing the crossover from pure diffusion to this super-diffusive behavior is perturbatively calculated. The crossover time’s dependence on the velocity and disorder strength is then tested numerically. Two-dimensional …
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Guided Wave Structural Health Monitoring with Environmental Considerations
… and applied stress create on Lamb wave propagation velocity in plates is analytically modeled and validated. Two methods are developed for the analytical derivative of the Lamb wave velocity; the first uses assumes a thermoelastic material while the second expands thermoelastic theory to …
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