Global ETD Search

1	Social Inequality in the Early Bronze Age at Bab Edh-Dhra, Jordan Patience, Natalie 14 December 2018 (has links) Bab edh-Dhra is the most extensively excavated cemetery from Early Bronze Age, Jordan. Despite thorough study, the social structure and existence of social inequality remain unclear. This was addressed using osteological evidence of physiological stress to compare between family tombs. In societies exhibiting social inequality, individuals of lower status experience higher levels of stress. Evidence of physiological stress (femoral length, LEH, metabolic disorders, periosteal reactions, cribra orbitalia, and porotic hyperostosis) was recorded using standard methods for 250 adults. The artifact counts in this study have been previously published. Differences in the frequency of stress indicators were compared using chi-square tests. The results show no difference in the frequency of stress indicators between tombs and no correlation between artifacts and frequency of stress indicators. This indicates that families at Bab edh-Dhra experienced similar stress levels and low inequality. This may be due to cultural practices, subsistence methods or lack of data. social inequality social stratification Bab edh-Dhra Jordan Early Bronze Age EBA skeletal stress paleopathology LEH cribra orbitalia porotic hyperostosis periosteal reaction adult stature growth interruption
2	Synthesis of Aluminum-Titanium Carbide Nanocomposites by the Rotating Impeller Gas-Liquid In-situ Method Anza, Inigo 06 September 2016 (has links) "The next generation of aluminum alloys will have to operate at temperatures approaching 300°C. Traditional aluminum alloys cannot perform at these temperatures, but aluminum alloys reinforced with fine ceramic particles can. The objective of this research is to develop a process to synthesize Al-TiC composites by the Rotating Impeller Gas-Liquid In-situ method. This method relies on injecting methane into molten aluminum that has been pre-alloyed with titanium. The gas is introduced by means of a rotating impeller into the molten alloy, and under the correct conditions of temperature, gas flow, and rotation speed, it reacts preferentially with titanium to form titanium carbide particles. The design of the apparatus, the multi-physics phenomena underlying the mechanism responsible for particle formation and size control, and the operation window for the process are first elucidated. Then a parametric study that leads to the synthesis of aluminum reinforced with TiC microparticles and nanoparticles is described. Finally, potential technical obstacles that may stand in the way of commercializing the process are discussed and ways to overcome them are proposed. " particle size control GIM growth interruption mechanism thermodynamics kinetics fluid dynamics microparticles microcomposites nanocomposites aluminum nanoparticles titanium carbide high temperature applications structural applications strength elongation stiffness automotive aeronautics transportation gas-liquid in-situ method rotating impeller dimensional analysis scale up

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Social Inequality in the Early Bronze Age at Bab Edh-Dhra, Jordan

Synthesis of Aluminum-Titanium Carbide Nanocomposites by the Rotating Impeller Gas-Liquid In-situ Method