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 2123 for “"polarization"”.
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POLARIZATION ABERRATIONS
Polarization aberrations are the variations of amplitude, phase, polarization and retardance associated with ray paths through optical systems. This dissertation develops methods for calculating the polarization aberrations of radially symmetric systems of weak polarizers, systems like lenses, …
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Neoclassical polarization
… banana regime and calculated the neoclassical polarization and associated zonal flow damping in the high frequency and low frequency limits. The work presented here extends R-H's calculation in several aspects. We calculate the neoclassical polarization for arbitrary radial wavelength zonal …
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Designs for Zero Polarization-Mode Dispersion And Polarization-Maintaining Fibers
… addresses several aspects pertaining to polarization in optical fibers and optical waveguide devices. In particular, the analysis and design of fibers that maintain polarization over long lengths, provide zero polarization-mode dispersion, and function as polarizers or mode filters are …
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Polarization Operators in Superspace
… super harmonics and discover a novel basis using polarization operators. We use polarization equivalence to establish a triangularity relation between the new basis and a known basis due to two groups of researchers Bergeron, Li, Machacek, Sulzgruber, and Zabrocki and Swanson and Wallach. …
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Detection of induced polarization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1958.
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Polarization independent microphotonic circuits
… require microphotonic circuits to be polarization independent, a requirement that is difficult to achieve with the high index contrast waveguides needed to form microphotonic devices. Chief among these microphotonic circuits is the optical add/drop multiplexer which requires …
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Interfacial polarization in membranes and its significance in the induced polarization of geologic materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1959.
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Transcriptomic profiling of macrophage polarization
… macrophages retain any persistent memory of past polarization states which may then impact their future repolarization to new states. In this dissertation, I first describe the evolving understanding of macrophage polarization and phenotypic plasticity and introduce commonly used models for …
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Polarization of certain conjugated systems
… mechanical calculations were used to examine the polarization of excited singlet states of twisted conjugated systems. This study began as an investigation of systems which are symmetric about a central double bond. Symmetry requires that when twisting about such a bold, there must be a crossing …
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Polarization-independent Liquid Crystal Devices
… and other photonic devices. Most LC devices are polarization dependent and require at least one polarizer. As a result, the optical efficiency is low. To enhance display brightness, a power hungry backlight has to be used leading to a high power consumption and short battery life. In a LC phase …
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Polarization manipulation in silicon photonics
… have quite different characteristics for the polarizations of light. The polarization dependence of on-chip silicon photonics components still remains a bottleneck for the real application of it. Efficient devices for manipulating polarizations are highly demanded. Herein, we present the …
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Presidential power and partisan polarization
… States Congress. This essay evaluates how that polarization has fundamentally reshaped the opportunities for the president to influence the voting decisions of members of Congress. The first chapter lays out a basic framework for understanding the possibilities for presidential persuasion in the …
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IPRAMA: INDUCED POLARIZATION FOR RAW MATERIALS
… this thesis focuses on the Airborne Induced Polarization (AIP) method. Electromagnetic (EM) methods—both airborne (AEM) and ground-based—are known to be sensitive to induced polarization (IP) effects when surveying chargeable grounds. Although the relevance of IP phenomena in EM data has been …
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Media Frames and Abortion Issue Polarization
… the outgroup, thus generating moral disgust and polarization (characterized by anger, bias, and activism) amongst those with opposing views. This study sought to answer whether presenting individuals with an incongruent abortion frame increases anger, bias, and activism (polarization), as well as …
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Polarization characterization of nonlinear laser propagation
… how the properties of the filament change with polarization and most importantly whether the polarization state is maintained during the nonlinear propagation of the laser pulse. This dissertation addresses the polarization evolution of a laser beam going through a nonlinear medium which can be …
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Cobalt catalysts towards parahydrogen induced polarization
… catalysts in the field of Parahydrogen Induced Polarization (PHIP) to yield large signal enhancements over the standard signals traditionally achieved in MRI and NMR spectroscopy. This field has advanced to yield enhancements via both hydrogenative (incorporation of p-H2 into the substrate) and …
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Polarization in the Sunyaev-Zeldovich effect
… light is presented. In this approach, the polarization state of a light beam is described by a tensor constructed from the time average of quadratic products of the electric field components in a local observer frame. This leads naturally to a covariant description which is ideal for …
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