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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 31 for “"Spreading rate"”.
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The nature and origin of fine-scale sea-floor relief
… relief created there is commonly related to the spreading rate. To study the creation of fine-scale sea-floor relief at mid-ocean ridges, detailed bathymetric profiles of mid-ocean rid£es collected with the deep tow instrument package were compiled. Tectonic features were identified in order to …
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A geological and geophysical study of the Tendaho Graben in the Afar Depression, Ethiopia: insights into transitional continental rifting
… the age of basaltic rocks (<0.78 Ma) indicate a spreading rate of ~ 0.64 cm/year. However, to achieve the ~50 km width of the Tendaho Graben which started opening ~2.0 Ma, a 1.64 cm/year spreading rate is needed between 1.6 and 0.78 Ma. This suggests that the spreading rate with Tendaho Graben is …
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Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… Available experimental data show that the spreading rate of turbulent bubbly mixing layers is greater than that of the corresponding single phase flow. The presence of bubbles also increases the turbulence level. The global structure of the flow proved to be sensitive to the void fraction. …
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An analysis of the morphology and volcano-tectonic structure of the Central Indian Ridge between 18º and 21ºS
… morphological variation at a relatively constant spreading rate (between 47 and 51mmyr-1). High resolution TOBI sidescan sonar data (cruise CD127) and multibeam bathymetry data (Magofond 2 cruise), complemented by regional geophysical and geochemical datasets, provide an important opportunity to …
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Oblique Seafloor Spreading, the Malpelo Plate Hypothesis, and Cocos-Nazca-Pacific Plate Motion Circuit
We show that oblique seafloor spreading occurs in several regions where obliquity, α, was not recognized before. These include the slow spreading centers of the Red Sea (α≈20°), intermediate spreading centers of the Cocos-Nazca plate boundary between 91°W and 94°W (α≈9°), and superfast spreading …
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Optimizing wettability of externally wetted microfabricated silicon electrospray thrusters
… roughness, imaging surface geometry, calculating spreading rates, and performing treated thruster current output tests. Two propellants, 1-ethyl-3-methyl-imidazolium tetraflouroborate (EMI-BF4) and 1-ethyl-3-methyl-imidazolium bis(triflouromethyl-sulfonyl)amide (EMI-IM), were used in contact angle …
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Instabilities of a compressible mixing layer
… velocity and temperature ratios on the growth rate are determined. Unlike the boundary layer flow, viscosity has a stabilizing effect on the mixing layer flow. Increasing the temperature ratio produces a strong stabilizing effect on the growth of the mixing flow; this stabilization does not, …
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Assessment of Turbulence Modelling for Compressibility Effects in Ejector Ramjet Applications
… the jet core length, mixing layer growth rate, and Reynolds shear stresses. Compressibility corrections were applied to the turbulence model through closures for dilatation dissipation (DD), pressure dilatation (PD), and a combination of both effects (CD). All models improved agreement to …
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Interactions between mantle plumes and mid-ocean ridges : constraints from geophysics, geochemistry, and geodynamical modeling
… the Marion and Bouvet hotspots on the ultra-slow spreading, highly-segmented Southwest Indian Ridge (SWIR). Gravity data indicate that both Marion and Bouvet impart high-amplitude mantle Bouguer anomaly lows to the ridge axis, and suggest that long-offset transforms may diminish along-axis plume …
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The sedimentology of the cambrian clastic sediments of Northwest Scotland
… may have been produced by variations in the spreading rate of the lapetus Ocean.
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New mixing-length model for numerical solution of turbulent supersonic flows
… The inability of Prandtl's model to predict the spreading rate of the free shear layer in slot injection into supersonic flows and higher Mach number turbulent boundary layer flows is due to the occurrence of large density changes which are not accounted for in the original Prandtl model. The new …
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Interactions between mantle plumes and mid-ocean ridges : constraints from geophysics, geochemistry, and geodynamical modeling
… the Marion and Bouvet hotspots on the ultra-slow spreading, highly-segmented Southwest Indian Ridge (SWIR). Gravity data indicate that both Marion and Bouvet impart high-amplitude mantle Bouguer anomaly lows to the ridge axis, and suggest that long-offset transforms may diminish along-axis plume …
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The influence of magma supply and eruptive processes on axial morphology, crustal construction and magma chambers
… crustal magma chambers at intermediate and fast spreading ridges. Variations in magma supply on time scales of ~100 Kyr generate along-axis changes in crustal thickness and temperature. Magma sill properties and hydrothermal activity are closely linked to spreading events which occur on much …
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Fracture Analysis of the Lower Oceanic Crust, Atlantis Bank, Southwest Indian Ridge
… oceanic core complex (OCC), formed at the slow-spreading (spreading rate/yr) Southwest Indian Ridge (SWIR)-Atlantis II transform junction. AB is a domal massif composed of lower crustal and upper mantle rocks exhumed along a normal-sense detachment shear zone/fault. OCCs are of high interest …
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Enhanced droplet spreading due to thermal fluctuations
… for the both the amplitude and the decay rates of the thermal capillary waves. However, at smaller length scales, there also existed a transition in behavior where the wave amplitudes of the continuum model and the molecular simulations matched, but the decay rates of waves in the …
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Large Eddy Simulation of Supersonic Twin-Jet Impingement Using a Fifth-Order WENO Scheme
… are also observed. Due to the high diffusion and spreading rate of the fountain, the interaction between the fountain and the jets is only significant up to a height which is less than 3𝐷*. It is found that the mean peak velocity in the fountain is 0.40406 𝑊ₒ* and it occurs at 0.536607𝐷* from the …
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Hydrothermal alteration of upper oceanic crust formed at fast spreading rates
… Project, Ocean Drilling Program, and Integrated Ocean Drilling Program Sites 504, 896, 843, 1179, 1149, 1224, 1243 and 1256 represent some the most significant penetrations into the upper portion of intermediate and fast spread crust to date. Analyses of whole rock chemical changes, Sr, O. …
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Seismic Imaging of the Global Asthenosphere using SS Precursors
… The 220-km topography is smoother beneath slower-spreading seafloors while it becomes rougher beneath faster-spreading seafloors. In addition, the roughness of the 220-km discontinuity increases rapidly with spreading rate at slow spreading seafloors, whereas the increase in roughness is much …
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Laser Doppler anemometry measurements of a confined turbulent water jet with a uniform background flow
… Conservation of momentum of the jet was demonstrated up to the measurement limit of x/d = 100. Its distribution suggests that the near fleld axial pressure variation has significant effects on the momentum flux. The results also indicate that momentum flux measurements require accurate data to …
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Discrete model for cancer tumor growth and effect of chemotherapy
… focused on growth of a single tumor with their spreading rate with some have included its metastasis. Some of the earlier models focus on exponential growth and its shift with time on to a linear model. The Gompertzian model involves a quadratic terms and that limit growth. We looked into Iwata …
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