An elastoviscoplastic finite element model of aluminum alloys is used to compare mechanical response among meshes formed with several different grain shapes. Tetrahedral elements are used to form grains of cubic, rhombic dodecahedral and truncated octahedral shape. The influence of the grain shape on the aggregate response is examined in terms of the stress variation and the aggregate elastic moduli. While elastic anisotropy in the bulk material is not found to be dependent on grain shape, consistent trends are observed in intragranular and intergranular stress distributions across these mesh definitions.

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where she received her PhD in Mechanical Engineering in 2008. Since then she has taught required and elective courses covering a wide range of topics in the undergraduate Mechanical Engineering curriculum. In her work with MTEI she co-leads teaching workshops for new faculty and assists with other teaching excellence initiatives. Her main teaching interests include solid mechanics and engineering mathematics.

subscripts a = ambient f = moving front jl f2 f; = i-th moving front fj h = hydrocarbon i j 1 = liquid m = moving front no. 1 = moving front no. 2 = moving front closest to X = 0 = region i or i-th isotherm = regionj or in the region closest to X = 0 = isotherm closest to X = 1 0 = initial temperature S = at complete solidification u: = water Superscripts n = n-th time step

where she received her PhD in Mechanical Engineering in 2008. Since then she has taught required and elective courses covering a wide range of topics in the undergraduate Mechanical Engineering curriculum. In her work with MTEI she co-leads teaching workshops for new faculty and assists with other teaching excellence initiatives. Her main teaching interests include solid mechanics and engineering mathematics.

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Baker, C. G. J.; Bergougnou, M. A. Can. J . Chem. Eng. 1972, 50, 695. Kim, S. D.; Baker, C. 0. J.; Bergougnou, M. A. Can. J. Chem. Eng. 1975, 53, 134. KO&, K.; MarWka, S.; Ueyama, K.; Matsurra, A.; Yamashlta. F.; Iwamoto, S.; Kato, Y.; Inoue. H.; Shloeta. M.; Suzuki, S.: Akehata, T. J . Chem.The effect of pH on the removal of pyritic sulfur in airlwater chemical coal cleaning was investigated. The pH was varied by adding sulfuric acid or sodium carbonate to a coal-water slurry. The effect of nearby neutral pH (-7) was determined in a buffer solution of sodium dihydrogen phosphate and disodium hydrogen phosphate. Data were taken in the temperature range of 130 to 190 OC, oxygen partial pressure of 0.32 to 1.36 MPa, and reaction times up to 3600 s. The rate of pyrite oxidation was found to be minimum at the nearby neutral conditions. Under otherwise identical conditions, the rate of pyrite oxidation was greater in basic pH than in acidic pH. The enhancement in the rate of pyrite oxidation is explained on the basis of electrochemil reactions. Under nearly neutral conditions, the overall reaction is shown to be controlled by the surface reaction, whereas under acidic as well as basic conditions, diffusion of oxygen through the product ash layer as well as the surface chemical reaction seems to be important.