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Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on laser surface engineering for improved biocompatibility of orthopedic biomaterials.

Poster for the 2012 University Scholars Day at the University of North Texas discussing research on the lives and policies of John Adams and Thomas Jefferson and their views on Machiavelli.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on maternal filicide.

Effective environmental management of DOE sites requires reliable prediction of reactive transport phenomena. A central issue in prediction of subsurface reactive transport is the impact of multiscale physical, chemical, and biological heterogeneity. Heterogeneity manifests itself through incomplete mixing of reactants at scales below those at which concentrations are explicitly defined (i.e., the numerical grid scale). This results in a mismatch between simulated reaction processes (formulated in terms of average concentrations) and actual processes (controlled by local concentrations). At the field scale, this results in apparent scale-dependence of model parameters and inability to utilize laboratory parameters in field models. Accordingly, most field modeling efforts are restricted to empirical estimation of model parameters by fitting to field observations, which renders extrapolation of model predictions beyond fitted conditions unreliable. The objective of this project is to develop a theoretical and computational framework for (1) connecting models of coupled reactive transport from pore-scale processes to field-scale bioremediation through a hierarchy of models that maintain crucial information from the smaller scales at the larger scales; and (2) quantifying the uncertainty that is introduced by both the upscaling process and uncertainty in physical parameters. One of the challenges of addressing scale-dependent effects of coupled processes in …

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on media coverage of modern environmentalism.

Remediation and long-term stewardship of uranium-contaminated sediments and groundwaters are critical problems at a number of DOE facilities and mining sites. Some remediation strategies based on in-situ bioreduction of U are potentially effective in significantly decreasing U concentrations in groundwaters. However, a number of basic processes require understanding in order to identify conditions more conducive to success of reduction-based U stabilization. Our current research targets several of these issues including: (1) effects of organic carbon (OC) forms and supply rates on stability of bioreduced U, (2) the roles of Fe(III)- and Mn(III,IV)-oxides as potential U oxidants in sediments, and (3) microbial community changes in relation to U redox changes. These issues were identified in our previous study on U bioreduction and reoxidation (Wan et al., 2005). Most of our studies are being conducted on historically U-contaminated sediments from Area 2 of the Field Research Center, Oak Ridge National Laboratory, in flow-through columns simulating in-situ field remediation.

Environmental nanoparticles are often poorly-crystalline or metastable structures, whose kinetics of formation and growth are poorly understood. Further, the sorption or growth of nanoparticles on mineral surfaces may control the mineral surface's reactivity and modify its ability to influence contaminant transport. Due to the characteristic length scale, a holistic understanding of the nucleation mechanisms and kinetics of nanoparticle formation on mineral surfaces is difficult to achieve with traditional methodology. In this work, our intent is to determine the molecular nature of nucleation on surfaces, the kinetics of surface nucleation and growth, and the effect of crystal surface topology using new synchrotron-based techniques. We have approached these objectives by: (1) combining state-of-the-art crystal-truncation rod diffraction (CTR) and grazing incidence x-ray absorption fine structure spectroscopy (GIXAS) techniques to investigate the three-dimensional molecular-scale geometry of silicate monomer sorption on the r-plane of hematite; and (2) developing a new grazing-incidence small angle x-ray scattering (GISAXS) setup at SSRL (0.08 nm{sup -1} < q < 8 nm{sup -1}) to explore the initial development of environmental nanoparticles on various mineral surfaces. This study also includes complementary techniques such as atomic force microscopy (AFM), bulk SAXS, dynamic light scattering (DLS), XRD, and TEM.

This poster outlines the recent restructure of the Graduate Library Assistant Program at the University of North Texas Libraries.

Poster on creating a Praxis of Zen Librarianship which frames reference and research assistance practices in academic libraries with theory and contemplative methodologies. It was presented at the Texas Library Association Conference held April 19-22, 2017 in San Antonio, TX.

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Poster for the 2012 University Scholars Day at the University of North Texas discussing research on the narration of a narrative.

Front: Text highlights action on various war fronts: France ; Italy ; Pacific ; Eastern Front ; Balkans. Inset maps: The advance beyond Rome ; Europe ; The Normandy coast ; China. Photographs: American assault troops move ashore in northern France ; Canadians with bicycles disembark from an infantry landing craft. Back: Map of Germany and adjacent areas shows railroads, superhighways, rivers, and mountains.

Front: Text describes action on various war fronts: Allies press western front Offensive; Manila battle continues - B-29's active; Soviets make new crossings Maps: Western Front, Soviet Salient, U.S. troops continue to clear Manila. Back: Text and illustration and photographs highlight the role of Military Police.

Front: Text describes action on various war fronts: Americans Cross Rhine; New Philippine Landings; Allies in Mandalay. Maps: Red Army menaces Oder line, Road to Mandalay, Mindanao P.I. Includes distance scale from Linz east to Berlin and from Zehden west to Berlin. Back: Map of the Pacific and the Far East. Inset maps: Ryukyu Retto, Okinawa, Saipan, Iwo-Jima, Paramushiru, Chisima Retto (Kurile Is.).

Front: Text highlights the strategic concept that guided the Western Allies to victory in Europe. Map shows German occupied territory as of 7 Dec 1941 in western Europe and North Africa. Back: Text and illustration highlight the postwar job as a threefold task: Speedily demobilize those in uniform who want to return to civilian life, maintain and supply occupation forces, and provide for peacetime military strength to help ensure world security.

Front: Text describes action on various war fronts: Tunisia -- Southwest Pacific -- Russia -- Mediterranean. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Allied drive in Tunisia -- Japanese controlled areas throughout the Southwest Pacific. Includes photographs: Helping Rommel's run [puppy stationed atop a Vickers machine gun] -- So he can fight (Staff Sergt. Hollers clerks at the San Angelo AAF Bombardier School in Texas) -- Blimp training. Back: Tunisia, map with inset showing location of Tunisia in the Mediterranean area.

Front: Text describes action on various war fronts: Sicily, Air offensive, Russia, New Georgia, New Guinea, Aleutians, Submarines. Includes list of senior commanders in the Invasion of Italy. Maps: New Georgia Islands; American 7th army positions in Licata and Vittoria Italy. Inset map: Italy and surrounding islands. Illustration: Landing on the underside [Allied air attack on ships unloading military cargo on the beaches of Southern Sicily]. Back: Text and color illustrations include various methods of enemy gas applications.

Front: Text describes action on various fronts: Solomons, New Hebrides, New Guinea, Aleutians, Far Eastern waters, Russia, Mediterranean, Western Europe. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Guadalcanal Island, Tulagi; Russian front. Includes photographs: Alaska road in use by December (construction of the Alaska Defense Highway); Zero fighter; in the Solomons; German mobile gun; Insect protection. Back: Airborne Command. 12 photographs with descriptive text and explanation of the role of airborne troops.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on correlations between parent's education and children's test scores.

Poster presentation for the 2012 University Scholars Day at the University of North Texas. This presentation discusses research on an excerpt of a confessional narrative in an early 15th century manuscript known as Cambridge, Magdalene College, Pepys 2125 against 'The Clensyng of Mannes Sowle', found in Oxford, Bodleian Library, Bodley 923.

Poster for the play Blues on 125th Street, performed by the Third World Players, written by Bob Ray Sanders, and directed by Curtis L. King. The play was performed on November 19, 1978 at the Dallas Convention Center Theater.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on the prevalence of heart disease in African-American men and the influence of cultural factors.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on preventing, rather than curing, cancer.