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  • About
  • 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.

Lattice formation in two-dimensional dispersions.

Shah, Pravinchandra Narharilal. January 1967 (has links)
No description available.

High yield growth of tellurium single crystals by the Czochralski method

Shih, Ishiang January 1977 (has links)
No description available.

Structure-property relationships in non-conventional liquid crystalline materials

Cook, Andrew G. January 2001 (has links)
The aim of this thesis is to investigate structure-property relationships in several types of non-conventional liquid crystalline materials. First, supramolecular hydrogen bonded complexes involving either acid or phenol-based donors with pyridyl-based acceptors were studied using FT-IRM. These studies were made to investigate the nature and temperature dependence of the hydrogen bond between the donor and acceptor moieties. Second, a study of carbohydrate liquid crystals was undertaken. In this investigation two different types of carbohydrate-based materials were synthesised; (a) a homologous series of mono-tailed carbohydrates, the methyl-6-O-(<i>n-</i>acyl)-a-D-glucopyranosides were prepared to study the effect of alkyl chain length on phase behaviour and to elucidate how stereochemistry and the position of the alkyl chain affects liquid crystallinity; (b) a novel non-symmetric dimer containing a methoxyazobenzene moiety and a carbohydrate headgroup to study the behaviour of a dimer consisting of two incompatible mesogenic groups. Third, the effect of terminal alkyl chain branching on the molecular organisation in the intercalated smectic. A phase, was studied with a view to exploring the nature of the driving force for smectic phase formation in symmetric and non-symmetric liquid crystal dimers. The symmetric dimer chosen was 4.060.4, while the non-symmetric dimer was CB.060.4. In both systems the <i>n</i>-butyl terminal chains were replaced by either <i>sec-</i>butyl or <i>tert</i>-butyl chains. To establish how these structural changes effect smectic phase formation, binary phase diagrams of <i>n</i>-butyl-based compound with the corresponding branched material have been constructed. Finally, a comparison of the mesogenic properties of a series of monomers, dimers and side-chain liquid crystal polymers containing a methoxyazobenzene mesogenic unit was made. There data were used to examine the virtual trimer model as a means of rationalising the mesogenic behaviour of the polymers.

An investigation of a truncation method applied to the one-space dimensional free boson lattice field theory

歐陽天祥, Au Yeung, Tin-cheung. January 1982 (has links)
published_or_final_version / Physics / Master / Master of Philosophy

Some physical effects of the orbit-lattice interaction

陳國森, Chan, Kwok-sum. January 1984 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy

Fabrication of Quantum Dots Lasers of two dimensional Photonic Crystal Microcavity Structures

Huang, Shr-Chiuan 28 July 2010 (has links)
In the thesis, we fabricated the quantum dots lasers of 2D photonic crystal microcavity structures by E-beam lithography. The Al0.5Ga0.5As sacrificing layer beneath the Dwells structure is used for the purpose of suspending the active layer by air. Therefore, it has a high refractive index contrast in vertical direction to confine energy. Finally, we could fabricate a low threshold current photonic crystal laser. We can judge the epitaxy quality by the Microdisk (MD) process before the photonic crystal device process. For the 2D photonic crystal microcavity, we design different kinds of window to support the photonic crystal membrane cavity. We use dry and wet etching technique and metal mask to fabricate MD and photonic crystal membrane cavity. We use £g-PL to measure MD cavity resonant mode for the device of diameter 3£gm at room temperature. In addition, we design three kinds of defects (L3, H2, H3) of photonic crystal membrane structures using the sample C488. We measure resonant mode with H3 structure. The H3 structure measured resonant wavelength 1.26£gm, with Q =503.

Some physical effects of the orbit-lattice interaction /

Chan, Kwok-sum. January 1984 (has links)
Thesis--Ph. D., University of Hong Kong, 1984.

An investigation of a truncation method applied to the one-space dimensional free boson lattice field theory /

Au Yeung, Tin-cheung. January 1982 (has links)
Thesis--M. Phil., University of Hong Kong, 1982.

An investigation into the phase noise of quartz crystal oscillators /

Bentley, Brendon January 2007 (has links)
Thesis (MScIng)--University of Stellenbosch, 2007. / Bibliography. Also available via the Internet.

Crystal aging of terephthalic acid

Elliott, Mary Alice 05 1900 (has links)
No description available.

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