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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
Showing 131 to 140 of 525 (0.009 seconds)| 131 |
Electron microscope transmission studies of single metal crystalsHowie, A. January 1961 (has links)
No description available.
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| 132 |
An X-ray study of certain peptidesDyer, H. B. January 1952 (has links)
No description available.
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| 133 |
The structure of body-centred anorthite and some observations on extinction in crystalsChandrasekhar, S. January 1958 (has links)
No description available.
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| 134 |
Electro-optic studies of bistable smectic A organosiloxane liquid crystalsGardiner, D. J. January 2007 (has links)
This thesis examines the material and electro-optic characterisation of organosiloxane liquid crystals; these materials, by virtue of their chemically distinct, tri-block structure possess wide smectic A (S<sub>A</sub>) phases. They include one monomesogenic series, which consists of a 4-(ω-alkyloxy)-4’-cyanobiphenyl unit terminated by pentamethyldisiloxane and two bimesogenic series, which consist of twin 4-(ω-alkyloxy)-4’-cyanobiphenyls joined via tetramethyldisiloxane or decamethylpentasiloxane. It is shown that these liquid crystals possess highly anisotropic conductivity, with the ratio of the conductivities parallel (<i>σ</i><sub>||</sub>) and perpendicular (<i>σ</i><sub>⊥</sub>) to the director as low as <i>σ</i><sub>||</sub>/<i>σ</i><sub>⊥</sub> ~ 0.005. For typical smectic A materials e.g. 4-octyl-4’-cyanobiphenyl (8CB) this value is 0.5. It is also demonstrated that a typical value of the dielectric anisotropy, Δ<i>ε</i>, is ~ 1, which is significantly less than other S<sub>A</sub> materials e.g. 8CB and Δ<i>ε</i> ~ 8.4. These material properties are explained in terms of the structure generated by these materials; the microphase separation of the siloxane units restricts ionic flow parallel to the director; the reduced Δ<i>ε</i> is explained in terms of increased anti-parallel correlation of molecular dipoles. These properties explain the unusual electro-optic results, in an electrically addressed bistable smectic A display, in that the threshold voltage of one mode, the clear to scattering transition (write), was approximately 0.5 that of the other mode, scattering to clear (erase). For 8CB, this ratio is typically 2.
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| 135 |
The micro-texture of certain crystalline materialsGay, P. January 1952 (has links)
No description available.
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| 136 |
The etching of diamond and of the associated minerals garnet and olivineMendelssohn, Monica Jutta January 1971 (has links)
No description available.
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| 137 |
The structure of crystals of some aromatic polycyclic hydrocarbons 2:13-benzfluoranthene and acenaphtheneEhrlich, H. W. W. January 1957 (has links)
No description available.
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| 138 |
Understanding Porous Crystal Growth By Scanning Electron MicroscopyStevens, Sam January 2010 (has links)
No description available.
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| 139 |
Surface crystallography of complex and disordered surfacesZheleva, Zhasmina Vasileva January 2012 (has links)
No description available.
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| 140 |
Surface characterisation and surface protection of germanium detector crystalsEngert, Tobias January 2010 (has links)
No description available.
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