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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
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Simulations of the Karlsruhe Dynamo Using the Lattice-Boltzmann Method / Simulationen des Karlsruhe Dynamos mit der Gitter-Boltzmann MethodeSarkar, Aveek 04 July 2005 (has links)
No description available.
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Tailoring the properties of metamaterials for linear and nonlinear applicationsSydoruk, Oleksiy 13 June 2007 (has links)
The thesis is devoted to magnetic metamaterials operating in the frequency range of 10 MHz 1 GHz. Mechanisms of tailoring the properties of metamaterials are developed and a number of linear and nonlinear applications is proposed.In Chapter 1, the introduction to the field of metamaterials is given and the main goal of the thesis is defined as the search for possible applications of low-frequency metamaterials. The main motivation is the potential of magnetic metamaterials in Magnetic Resonance Imaging (MRI).Chapter 2 briefly summarizes the near-field properties of magnetic metamaterials. Magnetic coupling between a pair of metamaterial elements is described and magnetoinductive (MI) waves propagating on the metamaterials arrays are introduced.In Chapter 3, the magnetic coupling between the elements is studied in more detail. Based on the analogy between MI waves and acoustic waves in solids, "diatomic" metamaterial arrays having two elements per unit cell are introduced. It is shown that by changing the resonant frequencies of the elements and the coupling between them it is possible to acquire additional freedom in tailoring the dispersion properties of MI waves compared to simple "monatomic" configurations.In Chapter 4, various linear applications of metamaterials are discussed. They are shift-dependent transmission, subwavelength imaging and focusing, and rotational resonance of MI waves. It is shown that the microscopic model based on taking the interaction between the elements into account allows for reliable explanation of the phenomena studied.In Chapter 5, a nonlinear application, parametric amplification of MI waves, is discussed. It is shown that parametric amplification can lead to the compensation of loss in metamaterials and to increase of the power extracted from an MRI detection system.Conclusions are drawn and possible directions for future work are determined in Chapter 6.
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Entwicklung eines quantitativen Verfahrens zur Streufeld- und Magnetisierungsbestimmung magnetischer Strukturen / Development of a quantitative method for the determination of the stray field and the magnetization of magnetic structuresDreyer, Sebastian 03 July 2007 (has links)
No description available.
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Photo-magnonics in two-dimensional antidot latticesLenk, Benjamin 12 December 2012 (has links)
No description available.
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Magnetization dynamics in all-optical pump-probe experiments: spin-wave modes and spin-current damping / Magnetisierungsdynamik in Pump-Probe Experimenten: Spinwellen Moden und Spinstrom DämpfungDjordjević Kaufmann, Marija 06 November 2006 (has links)
No description available.
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Das elektrochemische Potential auf der atomaren Skala: Untersuchung des Ladungstransports eines stromtragenden zweidimensionalen Elektronengases mit Hilfe der Raster-Tunnel-Potentiometrie / The electrochemical potential on atomic scale: Investigation of the charge transport of a current-carrying two-dimensional electron gas by means of Scanning Tunneling PotentiometryHomoth, Jan 03 July 2008 (has links)
No description available.
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Structural and Magnetic Properties of the Glass-Forming Alloy Nd60Fe30Al10 / Mikrostrukturelle und magnetische Eigenschaften der glasbildenden Legierung Nd60Fe30Al10Bracchi, Alberto 18 November 2004 (has links)
No description available.
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Thermische Stabilität und Reaktion metallischer Multilagen / Thermal stability and reaction of metallic multilayersEne, Constantin Buzau 19 December 2007 (has links)
No description available.
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