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Corrosion Performance of Ferritic Steel for SOFC Interconnect Applications

Description: Ferritic stainless steels have been identified as potential candidates for interconnects in planar-type solid oxide fuel cells (SOFC) operating below 800ºC. Crofer 22 APU was selected for this study. It was studied under simulated SOFC-interconnect dual environment conditions with humidified air on one side of the sample and humidified hydrogen on the other side at 750ºC. The surfaces of the oxidized samples were studied by scanning electron microscopy (SEM) equipped with microanalytical capabilities. X-ray diffraction (XRD) analysis was also used in this study.
Date: November 1, 2006
Creator: Ziomek-Moroz, M.; Holcomb, G.R.; Covino, B.S., Jr.; Bullard, S.J.; Jablonski, P.D. & Alman, D.E.
Partner: UNT Libraries Government Documents Department

Population Evacuations

Description: Emergency evacuation is one of the most important protective action alternatives when facing a natural or a man-made disaster. The planning and implementation of a large-scale emergency evacuation is a difficult and complex problem that requires the interactions of many agencies and involves a large amount of information. This article focuses on the latter and discusses the models that are normally used in the planning phase to evaluate this type of protective action alternatives and the information requirements for their implementation. Although many advances have been achieved in this area, especially during the last few years, a considerable amount of work still remains incomplete. Some of the important areas that need attention, such as improvements in the demographic models, integration of traffic simulation and threat evolution models, and real-time information for the deployment phase, are also discussed in this paper.
Date: January 1, 2008
Creator: Franzese, Oscar
Partner: UNT Libraries Government Documents Department

Multi-site genetic modification of monolignol biosynthesis in alfalfa (Medicago sativa): effects on lignin composition in specific cell types

Description: Article on multi-site genetic modification of monolignol biosynthesis in alfalfa (Medicago sativa) and the effects on lignin composition in specific cell types.
Date: March 2, 2008
Creator: Nakashima, Jin; Chen, Fang; Jackson, Lisa A.; Shadle, Gail L. & Dixon, R. A.
Partner: UNT College of Arts and Sciences

Switchgrass (Panicum virgatum) possesses a divergent family of cinnamoyl CoA reductases with distinct biochemical properties

Description: Article on switchgrass (Panicum virgatum) possessing a divergent family of cinnamoyl CoA reductases with distinct biochemical properties.
Date: July 27, 2009
Creator: Escamilla-Treviño, Luis; Shen, Hui; Uppalapati, Srinivasa Rao; Ray, Tui; Tang, Yuhong; Hernandez, Timothy et al.
Partner: UNT College of Arts and Sciences

Understanding enzyme catalysis using computer simulation

Description: Enzymes catalyze biochemical reactions with remarkable specificity and efficiency, usually under physiological conditions. Computer simulation is a powerful tool for understanding enzyme catalytic mechanisms, particularly in cases where standard experimental techniques may be of limited utility. Here, we present an overview of the application of computer simulation techniques to understanding enzyme catalytic mechanisms. Examples using quantum chemical methods, as well as combined quantum mechanical/classical mechanical approaches, are provided.
Date: January 1, 2010
Creator: Parks, Jerry M; Imhof, Petra & Smith, Jeremy C
Partner: UNT Libraries Government Documents Department

Conservation Laws for Coupled Hydro-mechanical Processes in Unsaturated Porous Media: Theory and Implementation

Description: We develop conservation laws for coupled hydro-mechanical processes in unsaturated porous media using three-phase continuum mixture theory. From the first law of thermodynamics, we identify energy-conjugate variables for constitutive modeling at macroscopic scale. Energy conjugate expressions identified relate a certain measure of effective stress to the deformation of the solid matrix, the degree of saturation to the matrix suction, the pressure in each constituent phase to the corresponding intrinsic volume change of this phase, and the seepage forces to the corresponding pressure gradients. We then develop strong and weak forms of boundary-value problems relevant for 3D finite element modeling of coupled hydro-mechanical processes in unsaturated porous media. The paper highlights a 3D numerical example illustrating the advances in the solution of large-scale coupled finite element systems, as well as the challenges in developing more predictive tools satisfying the basic conservation laws and the observed constitutive responses for unsaturated porous materials.
Date: February 19, 2010
Creator: Borja, R I & White, J A
Partner: UNT Libraries Government Documents Department