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Does Dirt Burn? Application of Scanning Calorimetry to Estimate Soil Organic Matter Loss After Fires
Sergey V. Ushakov, Divya Nag and Alexandra Navrotsky.
The heating of soil during fires may result in organic matter loss. The ratio of combustion enthalpy of soil organic matter to the alpha-beta quartz transition enthalpy can be used to compare heated and unheated soil. This eliminates the need to weigh samples and is insensitive to differences in water content between heated and unheated soils, making possible in-situ applications in field sites.
Three-Dimensional Gas-Solid Fluidized Bed Simulation Based on the Kinetic Theory of Granular Flow
Maria G. E. Silva, Fábio Marini, Milton Mori. UNICAMP
In this study, a three-dimensional two-phase flow model based on the kinetic theory of granular flow (KTGF) was used to predict the behavior of a gas-solid fluidized bed. The model is based on a Eulerian description of the two phases, gas and particles, and is composed of a set of mass conservation and momentum equations for each phase.
Solvetn Vapor Sorption in Thin PMMA FIlms
Allan L. Smith and Fletcher C. Smith. Masscal Scientific Instruments
ACrylic polyers such as PMMA are used as coatings binders. We studied the sorption of acetone, methylethylketone, and toluene in PMMA thin fims ( 1-5 microns) using the Masscal G1
Study of CO2 Adsorption on Amorphous HfO2 using PTA on the Netzsch 449
Sergey Ushakov and Alexandra Sergey . UC Davis
HfO2 is a prospective high-k replacement for SiO2 for future integrated circuits. We study energetic of amorphous and nanocrystalline hafnium oxide by high temperature oxide melt solution calorimetry to establish critical sizes where phase stability switches by surface energy terms.
Thermochemical Study of the Relations of the Monazite and Zircon Structures in the Rare-earth Orthophosphates
Sergey Ushakov and Alexandra Navrotsky. University of California
Existence of both zircon- and monazite-type polymorphs for Dy, Tb and Gd
orhtophosphates has been previously reported, however, available structural and thermodynamic data are scarce. The goal of this work was to evaluate the energetics of structural changes in these compounds.
Enthalpy and Volume Changes for m-t Phase Transition in HfO2
Sergey V. Ushakov and Alexandra Navrotsky. University of California
HfO2 is a prospective material for application as high-temperature ceramic and high-K dielectric in integrated circuits. HfO2 isostructural to zirconium oxide and undergo monoclinic-tetragonal and tetragonal-cubic translations with temperate. High temperature phases are not quenchable but can be obtained in high area samples. Monoclinic-tetragonal transition in hafnia is critical for its application.
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