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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.
1

Evaluation Of A Field Histology Technique And Its Use In Histological Analyses Of Mummified Tissues From Dakhleh Oasis, Egypt

Branson, Jennifer 01 January 2013 (has links)
Use of paleohistology to identify histological structures in mummified tissues can allow insight into pathological conditions such as parasites, cirrhosis and lung scarring. However, increasing concerns in archaeological sciences include restrictions on removal of human remains from their site of origin for scientific study. In the case of mummified remains, the use of a field paleohistology kit may be deemed useful for ‘point-of-care’ pathological assessment of preserved tissues. This study evaluates field paleohistology protocols for mummified soft tissue based on techniques used modern medical field missions. The application of this technique alleviates the need for export or removal of remains from the site for analysis. Samples from the Kellis 1 Cemetery (c. 60BC – AD100) and Deir abu Metta Christian church (c. 4th century AD) in the Dakhleh Oasis, Egypt were processed using field paleohistology techniques in both a laboratory and field setting. Two processes of soft tissue preservation were identified in this sample; anthropogenic or ‘artificial’, and spontaneous or ‘natural’ mummification. In cases of artificial mummification, the use of resin, both on internal and external surfaces of the body, caused difficulty in the rehydration process and visualization of the cellular structures. In cases of natural mummification, the technique was more successful in rehydration, slide mounting, imaging, and detection of cellular structures. Results also showed some tissue samples to be unsuitable for this method due to variable preservation and loss of tissue integrity during processing (e.g., liver). However, consistent quality microscope slides and digital images were obtained from samples of skin, muscle, lung, and liver indicating this point-of-care field method is a viable option for paleohistological field analyses and identification of pathological conditions in mummified human remains.
2

Density Functional Modeling of Mechanical Properties and Phase Transformations in Manocrystalline Materials

Stefanovic, Peter January 2008 (has links)
We introduce a new phase field technique that incorporates the periodic nature of a crystal lattice by considering a free energy functional that is minimized by periodic density fields. This free energy naturally incorporates elastic and plastic deformations and multiple crystal orientations. The new phase field technique can be used to study a host of important phenomena in material processing that involve elastic and plastic effects in phase transformations. This novel phase field approach is used to study elastic and plastic deformation in nanocrystalline materials with a focus on the "reverse" Hall-Petch effect. In addition we apply the method to dendritic solidification in binary alloys and the role of dislocations in spinodal decomposition. / Thesis / Doctor of Philosophy (PhD)

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