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 2287 for “"crystals"”.
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Theory of phase transitions in liquid crystals and plastic crystals
The properties of the layered, or smectic, liquid crystals are explained in terms of progressive freezing-out of rotational and translational degrees of freedom within each smectic plane. McMillan's dipole-dipole interaction model is extended to include intermolecular repulsions. In the …
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Porphyrin liquid crystals
Made available in DSpace on 2011-05-07T12:58:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712399.pdf: 6112917 bytes, checksum: 8710d51cba58a5e941a2d63d6e735ca7 (MD5) Previous issue date: 1996
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Hypersonic phononic crystals
… This thesis explores hypersonic phononic crystals as means to achieve control over high frequency acoustic phonons. An integrated approach to fabrication, measurement and analysis of hypersonic phononic crystals with band gaps in the GHz range is presented. First, the phonon dispersion …
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Polymeric photonic crystals
… creating one, two and three dimensional photonic crystals out of self-assembling block copolymers has been formulated. In order to form useful band gaps in the visible regime, periodic dielectric structures made of typical block copolymers need to be modified to obtain appropriate characteristic …
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Cylindrical photonic crystals
In this thesis, we explore the properties of cylindrical photonic crystal waveguides in which light is confined laterally by the band gap of a cylindrically-layered photonic crystal. We show in particular that axially-uniform photonic band gap waveguides can exhibit novel behavior not encountered …
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Phosphors and photonic crystals
… ordered bare opal templates. Photonic phosphor crystals of Y2O3: Eu, Tb, Gd and Y2O3: Tm were synthesised using these templates to study the photonic band gap properties. Nano-sized Y2O3: Eu phosphors have been successfully incorporated into mono-dispersed silica spheres which have been …
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Sodium Fluoride Hopper Crystals
… and use of fluoride. Faster dissolving crystals of NaF in a dentifrice could improve the efficacy of current preventative treatments. In this study, crystals of sodium fluoride with a high surface area to volume ratio were prepared by the addition of an aqueous solution of sodium …
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Addressable plasma photonic crystals
Photonic crystals that comprise arrays of microplasmas can act as recon g- urable lters in the microwave and THz spectral regions. When compared to conventional photonic crystals fabricated in a solid, plasma photonic crystals are recon gurable at electronic speeds which, in turn, allows for the …
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Statistical Mechanics of Crystals
Made available in DSpace on 2015-05-12T17:11:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0002078.PDF: 1854491 bytes, checksum: d4bec0410b46ad89aab5e72c169a1657 (MD5) Previous issue date: 1950
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Quantum electronic liquid crystals
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-23T19:39:33Z No. of bitstreams: 1 Lawler_Michael.pdf: 904294 bytes, checksum: 70bd50160bc3ec456d63a22b6083297a (MD5)
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Dipole interactions in crystals
Thesis (Ph.D.) Massachusetts Institute of Technology. Dept. of Physics, 1947.
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Plasticity of magnesium crystals.
Massachusetts Institute of Technology. Dept. of Metallurgy. Thesis. 1966. Ph.D.
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Block copolymer photonic crystals
… isopleth of composition is examined and photonic crystals containing up to 60 wt % homopolymer exhibit wavelength selective reflectivity from the ordered morphology. The wavelength of reflectivity is correlated with the lamellar repeat spacing and morphology. The optical properties of solvent …
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Understanding Jupiter’s Polar Vortex Crystals
This thesis explores vortex dynamics on background planetary potential vorticity (PV) gradients caused by planetary rotation. Using a quasi-geostrophic (QG) pseudo-spectral model, we investigated the formation of opposing PV annuli that form on the vortex edges as a result of this drift known as a …
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Understanding Jupiter’s Polar Vortex Crystals
This thesis explores vortex dynamics on background planetary potential vorticity (PV) gradients caused by planetary rotation. Using a quasi-geostrophic (QG) pseudo-spectral model, we investigated the formation of opposing PV annuli that form on the vortex edges as a result of this drift known as a …
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Interface Dynamics in liquid crystals
La dinámica de interfases es un tópico de estudio que ha suscitado mucho interés en distintos contextos tales como el magnetismo, dinámica de poblaciones, óptica, por mencionar algunos. Una interfase es un borde o superficie que conecta espacialmente dos estados de equilibrio y que puede exhibir …
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Solvatochromic pyrogallarenes and pyrogallarene crystals
Pyrogallarenes have the ability to self-assemble into a variety of structures. Crystal forms ranging from bilayers to dimers and hexamers have been isolated. One unique cocrystal, PgC[subscript 3]-(CH[subscript 3])[subscript 2]CO-0.5C[subscript 6]H[subscript 4]Cl[subscript 2]-nH[subscript 2]O, is …
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Polygonization in Bent Zinc Crystals
Made available in DSpace on 2014-12-04T23:26:49Z (GMT). No. of bitstreams: 1 6104378.pdf: 2857576 bytes, checksum: eba2cb6db2676d28a56a5a117ce060d1 (MD5) Previous issue date: 1961
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Polaron transport in ionic crystals
… and magnetoconductivity in a variety of ionic crystals. The conduction bands of seven alkali halides were found to be isotropic with a measuring accuracy of ± 0.5%. Cyclotron resonance of photocarriers was observed at 139 GHz by electron heating effects. Polaron effective masses were measured …
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