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 86 for “"dynamo"”.
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A direct current compensator dynamo
Made available in DSpace on 2016-11-09T23:48:15Z (GMT). No. of bitstreams: 2 5976720_opt.pdf: 9644175 bytes, checksum: 194c5b9233710d8193a10264309fa807 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1912
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Decline of the lunar dynamo
… avenue to test for the presence of ancient core dynamos on planetary bodies. If a core dynamo was indeed present, determining the lifetime of the magnetic field informs about the nature of the dynamo generation mechanism, which in turn may provide constraints for the body's thermal (for …
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An experimental study of an Edison dynamo
Thesis: B.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1891
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Design of a numerical solar dynamo model.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1971.
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A study of the United States constant potential dynamo
Thesis: B.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1891
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Effect of Chemistry on Electrodynamics in the Martian Dynamo Region
… the effect of chemistry on ion populations in the dynamo region, where ion dynamics are driven by collisions while electrons are still mostly magnetized. We adopt a mesoscale model to simulate dynamics of electrons and ions in the upper atmosphere (100–400 km). Our approach focuses on numerical …
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Stable Alfven Wave Dynamo Action in the Reversed Field Pinch
… reversed field pinch. This thesis examines the dynamo action of stable Alfven waves as a means of generating toroidal flux, (PHI)(,z). Recent advances in linear resistive MHD stability analysis are used to calculate the quasi-linear dynamo mean electromotive force, , of Alfven waves. This emf is …
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Shearing waves and the MRI dynamo in stratified accretion discs
… local simulations of the MRI have shown that the dynamo changes character on addition of vertical stratification. We investigate numerically 3D hydrodynamic shearing waves with a conserved Hermitian form in an isothermal disc with vertical gravity, and describe the associated symplectic structure. …
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Cio-cio-san no yuutsu: memoirs of magnetogenesis and turbulent dynamo theory
… and density. The dependence of the onset of dynamo action on various values of the magnetic Reynolds- and Prandtl numbers for the cases of the Roberts Flow kinematic dynamo and a flow that, in turn, incorporates both a non-helical and helical forcing function that introduces turbulence into …
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Cio-cio-san no Yūutsu: memoirs of magnetogenesis and Turbulent Dynamo Theory
… and density. The dependence of the onset of dynamo action on various values of the magnetic Reynolds- and Prandtl numbers for the cases of the Roberts Flow kinematic dynamo and a flow that, in turn, incorporates both a non-helical and helical forcing function that introduces turbulence into …
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The experimental study of an alternating current dynamo by the air calorimeter method
Thesis: B.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1891
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Dynamo in the Desert: Energy Development and Environmental Contestation in the San Juan Basin, 1960-1985
This thesis examines coal-energy development in the San Juan Basin, which is located in the culturally rich and environmentally diverse Four Corners region. Between 1960 and 1985 intensive coal-energy development—in the form of strip mines and power plants—took place in the western portion of the …
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A dynamo case study of Mercury, and the early orbital and thermal evolution of the Moon
… is difficult to be explained with an Earth-like dynamo. We enhance the traditional dynamo model by adding a stably stratified layer in Mercury's core and a north-south asymmetric heat flux pattern at the core-mantle boundary, and find multiple cases in which the surface magnetic field exhibits …
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Role of multiscale atmospheric conditions in the evolution of convective organization during MJO-1 of DYNAMO/CINDY/AMIE
… Oscillation (MJO) event observed by the DYNAMO/CINDY/AMIE field campaigns in October 2011. Shifts in reflectivity and dual-polarization characteristics of four precipitation types over two time periods, at the beginning and end of the MJO passage over the radar, showed a transition …
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The influence of core crystallization and mantle overturn on ancient dynamos
… in planetary science regarding potential dynamo action in asteroids, the Moon, and Mars. First, we examine the physical processes active during asteroid core crystallization. We model inward crystallization as well as crystal settling and the compaction of a possible cumulate inner core. …
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Dynamics of the rise of magnetic flux tubes in stellar interiors
In sonnenähnlichen Sternen erhält ein Dynamo-Mechanismus die Magnetfelder. Der Babcock-Leighton-Dynamo beruht auf einem solchen Mechanismus und erfordert insbesondere die Existenz von magnetischen Flussröhren. Man nimmt an, dass magnetische Flussröhren am Boden der Konvetionszone entstehen und …
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Scale selection in hydromagnetic dynamos
… turbulent convection that ultimately powers the dynamo. Motivated by the scale separation considerations, in this thesis we study the parametric scale selection of dynamo action. Although helioseismology has made a lot of progress in the study of the solar interior, the precise motions of plasma …
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Recent lunar magnetism
… common sources of magnetic fields (e.g. core dynamo and long-lived impact plasma fields) have not been present within the last 1.5 Ga. To better characterize the source of magnetization in young lunar samples, we conducted paleomagnetic measurements on several subsamples of lunar glass 12017, …
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Zum Dynamoeffekt in extern getriebenen Strömungen
… anderer kosmischer Objekte durch den sogenannten Dynamoeffekt verursacht werden, der genaue Mechanismus als auch die notwendigen Voraussetzungen und Randbedingungen der zugrundeliegenden Strömungen sind aber weitgehend unbekannt. Die für einen Dynamo interessanten Strömungsmuster, die im Inneren …
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