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 355 for “"ridges"”.
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Apparent ridges for line drawing
… respect to a viewing screen plane, and apparent ridges as the locus points of the maximum of the view-dependent curvature. We derive the equation for apparent ridges and present a new algorithm to render line drawings of 3D meshes. We show that our apparent ridges encompass or enhance aspects of …
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Internal tide generation by tall ocean ridges
… currents flowing over submarine topography. Tall ridges that are nominally two-dimensional (2-D) are sites of particularly strong generation. The subsequent dissipation of internal tides contributes to ocean mixing, thereby playing an important role in the circulation of the ocean. Strong internal …
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Internal tide generation by tall ocean ridges
… currents flowing over submarine topography. Tall ridges that are nominally two-dimensional (2-D) are sites of particularly strong generation. The subsequent dissipation of internal tides contributes to ocean mixing, thereby playing an important role in the circulation of the ocean. Strong internal …
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Basalt petrogenesis beneath slow- and ultraslow-spreading Arctic mid-ocean ridges
… measured for the slow-spreading Arctic mid-ocean ridges (MOR). A focused case study of 33 young (<10ka) MOR basalts (MORB) from the shallow endmember of the global ridge system, the Kolbeinsey Ridge (67°05’-70°26’N) found that unaltered Kolbeinsey MORB have universally high (230Th/238U) …
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Mantle upwelling, melt generation, and magma transport beneath mid-ocean ridges
… pattern of mantle flow beneath highly-segmented ridges. Even when the buoyant component of mantle flow is constrained to be two-dimensional, laboratory studies show that a segmented ridge will drive three-dimensional mantle upwelling. However, using reasonable mantle parameters in numerical …
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An optimized dual-polarized quad-ridges horn antenna with pyramidal sidewalls
… profile with a circular segment for the ridges deliver the best performance. These configurations for the transition and flared horn sections are combined in the complete antenna. The optimized antenna has a 12.5:1 operational bandwidth with improved performance in terms of the VSWR, the …
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Mantle upwelling, melt generation, and magma transport beneath mid-ocean ridges
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Basalt petrogenesis beneath slow- and ultraslow-spreading Arctic mid-ocean ridges
… measured for the slow-spreading Arctic mid-ocean ridges (MOR). A focused case study of 33 young (<10ka) MOR basalts (MORB) from the shallow endmember of the global ridge system, the Kolbeinsey Ridge (67°05'-70°26'N) found that unaltered Kolbeinsey MORB have universally high (230Th/238U) …
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A comparison of bistatic scattering from two geologically distinct mid-ocean ridges
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1999.
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Crustal accretion and evolution at slow and ultra-slow spreading mid-ocean ridges
Half of the ocean crust is formed at spreading centers with total opening rates less than 40 km/Myr. The objective of this Thesis is to investigate temporal variations in active ridge processes and crustal aging at slow-spreading centers by comparing axial crustal structure with that on conjugate …
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The geological record of oceanic crustal accretion and tectonism at slow-spreading ridges
… recovered from fault zones at slow-spreading ridges.
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Crustal accretion and evolution at slow and ultra-slow spreading mid-ocean ridges
Half of the ocean crust is formed at spreading centers with total opening rates less than 40 km/Myr. The objective of this Thesis is to investigate temporal variations in active ridge processes and crustal aging at slow-spreading centers by comparing axial crustal structure with that on conjugate …
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Axial structure of fast spreading mid-ocean ridges : implications for overlapping spreading centers
Thesis (M.S.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 1986.
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Mantle convection, melt migration and the generation of basalts at mid-ocean ridges
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institute, 1991.
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The geological record of oceanic crustal accretion and tectonism at slow-spreading ridges
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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A study of high pressure ridges to the east of the Appalachian Mountains,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1971.
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The crustal structure and subsidence history of aseismic ridges and mid-plate island chains
… isostasy and subsidence history of aseismic ridges and mid-plate island chains. Analysis of gravity and bathymetry data across the Ninetyeast and eastern Walvis Ridges indicates these features are locally compensated by an over thickening of the oceanic crust. Maximum crustal thicknesses are …
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The Genesis of Sandy Soils on Beach Ridges Along Lake Michigan, Extreme Northeastern Illinois
Made available in DSpace on 2014-12-14T04:57:31Z (GMT). No. of bitstreams: 1 7915319.pdf: 8538395 bytes, checksum: a6ec545bf1f553f9f4313720ce10820a (MD5) Previous issue date: 1979
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The crustal structure and subsidence history of aseismic ridges and mid-plate island chains
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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