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 495 for “"fronts"”.
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Vertical transport at curved ocean fronts
Ocean fronts are boundaries that separate distinct water masses and span a broad range of spatial scales, from basin-scale (103 km) western boundary currents such as the Gulf Stream and Kuroshio, to mesoscale (102 km) eddies and submesoscale (10 km) filaments. At mesoscale and submesoscale fronts, …
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Optimal controller comparison using Pareto fronts
… and Performance Measures for Pareto fronts as tools for comparing modern control schemes in a more robust and objective manner.
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Ocean fronts formed at sea ice boundaries
… firstly the buoyancy input to small scale fronts formed in the summer marginal ice zone is considered and secondly, an hierarchy of numerical models of ice and ocean dynamics are employed. Results are also reported of fieldwork carried out in the East Greenland current (MIZEX-84, LANCE …
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On the evolution & equilibration of submesoscale fronts
Submesoscale fronts with large horizontal density gradients and O(1) Rossby numbers are common in the upper ocean. These fronts are associated with large vertical transport and are hotspots for biological activity. Submesoscale fronts are susceptible to symmetric instability — a form of …
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The formation of New England coastal fronts
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1987.
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Generation and propagation of focused shock fronts.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1974
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Potential vorticity conservation in upper tropospheric fronts.
Massachusetts Institute of Technology. Dept. of Meteorology. Thesis. 1966. M.S.
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Particle Image Velocimetry Study of Density Current Fronts
The laboratory facility used allows the study of the front in a stationary setting, and also in its natural advancing state, for the case of a constant input of dense fluid to the system. These two settings are complementary, as the former highlights the mixing processes at the interface of the …
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Particle-in-cell simulations of perpendicular supernova shock fronts
The origin of cosmic rays was the subject of several studies for over a century. The investigations done within this dissertation are one small step to shed some more light on this mystery. Locating the sources of cosmic rays is not trivial due to the interstellar magnetic field. However, the …
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Time-lapse Acoustic Imaging of Oceanic Fronts and Eddies
Seismic reflection surveying is used to generate acoustic images of the water column. This technique employs conventional multi-channel equipment which is used to image the solid Earth. In the water column, acoustic impedance contrasts are produced by variations in temperature and, to some extent, …
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Interfaces in disordered media. Scaling growth, avalanche dynamics, and microfluidic fronts
The long desired possibility to classify the <i>scaling growth</i> of a rough surface in terms of <i>universality classes</i> has become a considerably ambitious task, not to say impossible in some cases. <br></br><br></br> This is particularly true, for instance, in the problem of a fluid filling …
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Stability of planar fronts for a class of reaction diffusion systems
… traveling waves and multidimensional planar fronts as well as space-independent steady states for a class of reaction diffusion systems that arise in combustion theory and chemical-reaction models. We begin by extending the recent one-dimensional stability results for reaction diffusion …
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Investigating detonation fronts in small explosive charges using a wave shaper
… Chapman-Jouguet condition. Converging detonation fronts can detonate insensitive explosives or increase metal pushing power in explosively formed penetrators (EFPs). While there are many complicated ways to generate a convergent front in an explosive, using inert wave shaper (also called an …
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Relationships between sea surface temperature and nutrients in satellite detected oceanic fronts
… events. Some of these have associated "chemical fronts" and increased biological activity. Satellite IR imagery was used to locate "discontinuities" and with in situ monitoring the development of these features were studied. Interrelationships between sea surface temperature, nutrients and …
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The evolution of ocean fronts in the presence of mixed layer turbulence
Fronts, or regions with large horizontal density gradients, are common and important features of the upper ocean. On sufficiently large scales, the hydrostatic pressure gradient associated with the horizontal density gradient is often nearly balanced by a geostrophic (or thermal wind) …
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Submesoscale Biophysical Interactions on the Gulf Stream: Eddies, Fronts, and New Observational Methods
… scale properties in ocean biology. Persistent fronts of western boundary currents like the Gulf Stream are hotspots for submesoscale dynamics that may influence phytoplankton productivity and diversity with ramifications across marine ecosystems. In this dissertation I: 1) review the use of …
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Dusty gust fronts and their contributions to long-lived convection in West Africa/
… we must understand the life cycle of gust fronts, which invariably accompany thunderstorms and often initiate them. In this thesis, I track 40 gust fronts observed during summer 2006 by the MIT radar in Niamey, Niger and characterized with ground station measurements. A novel technique is …
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Machine Learning Models for On-Orbit Detection of Temperature and Chlorophyll Ocean Fronts
Small-scale ocean fronts play a significant role in absorbing the excess heat and CO2 generated by climate change, yet their dynamics are not well understood. Existing in-situ and remote sensing measurements of the ocean are of inadequate spatial and temporal coverage to globally map small-scale …
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The stability of finite-amplitude, neutrally stable baroclinic waves and their associated fronts
Thesis. 1975. Sc.D.--Massachusetts Institute of Technology. Dept. of Meteorology.
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