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Metropolitan Government of Nashville-Davidson (balance), TN, United States

Alderman D.H.,University of Tennesse | Inwood J.,University of Tennessee at Knoxville
Annals of the American Association of Geographers | Year: 2016

This article explores spatial mobility as a form of African American resistance and self-determination. We argue for examining the everyday activism and “countermobility work” of ordinary people of color as they move in ways that subvert, negotiate, and survive white supremacy. These ideas are developed through a historical case study not typically identified with the black civil rights struggle, specifically the National Association for Stock Car Auto Racing (NASCAR) and the “hard driving” of Wendell Scott. The first and only African American driver to win at NASCAR’s top level, Scott raced throughout the segregated South and faced considerable discrimination in what was otherwise an all-white sport. We offer a critical (re)reading of Scott’s racing career as antiracism mobility work and focus on the bodily, social, and technological practices he employed to maintain and even enhance his mobility around tracks and to and from races. Scott did not represent his efforts in terms of civil rights activism, but it is important to contextualize black resistance outside the confines of formal protest to include the struggle for survivability and material reproduction. The work of racing and driving was part of Scott’s geographically situated political practice and important to the struggle to access and move about the sport of stock car track racing and hence the larger U.S. landscape of citizenship. Our discussion has implications for analyzing historic practices of resistance but also has currency for understanding how countermobility practices remain central to resisting continuing racial discrimination. © 2016 by American Association of Geographers.

McFarlane N.,University of Tennesse
Midwest Symposium on Circuits and Systems | Year: 2012

In this work, we model single photon avalanche diodes (SPADs) as communication channels. We apply classical Shannon results for a Gaussian channel to typical SPAD circuits. Thus we look at the information rate and the bit energy of the circuit. By considering the noise sources for a generic SPAD sensor we develop the information rate model as a function of the excess bias voltage and perimeter gate voltage. We find that when considering only the dark count rate that there is a single optimum excess bias voltage that gives the maximum information rate. We conclude there is an excess voltage, gate voltage pair that optimizes the information rate. © 2012 IEEE.

Walter K.H.,Health Services Research and Development | Varkovitzky R.L.,PTSD Outpatient Clinic | Owens G.P.,University of Tennesse | Lewis J.,Trauma Recovery Center | Chard K.M.,Trauma Recovery Center
Journal of Consulting and Clinical Psychology | Year: 2014

Objective: Across the Veterans Affairs (VA) Healthcare System, outpatient and residential posttraumatic stress disorder (PTSD) treatment programs are available to veterans of all ages and both genders; however, no research to date has compared these treatment options. This study compared veterans who received outpatient (n = 514) to those who received residential treatment (n = 478) within a VA specialty clinic on demographic and pretreatment symptom variables. Further, the study examined pre- to posttreatment symptom trajectories across the treatment programs. Method: All 992 veterans met diagnostic criteria for PTSD and attended at least 1 session of cognitive processing therapy (CPT) in either the outpatient or residential program. Bivariate analyses were utilized to investigate differences between samples on demographic variables and severity of pretreatment symptoms. Multilevel modeling (MLM) was used to investigate the change in symptomatology between the 2 samples from pre- to posttreatment. Results: Analyses indicated that the samples differed on all demographic and pretreatment symptom variables, with residential patients reporting higher scores on all assessment measures. MLM results demonstrated that symptom scores improved for all veterans across time, with outpatients consistently reporting fewer symptoms at both time points. The time by program interaction was significant for PTSD-related symptom trajectories, but not for the depression-related symptom trajectory. Conclusion: This is the 1st study to compare pretreatment characteristics and treatment outcome between veterans receiving outpatient and residential PTSD treatment. Findings may help clinicians select appropriate care for their patients by identifying relevant pretreatment characteristics and generally informing expectations of treatment outcome. © 2014 APA.

Nochetto R.H.,University of Maryland University College | Otarola E.,University of Maryland University College | Salgado A.J.,University of Maryland University College | Salgado A.J.,University of Tennesse
Foundations of Computational Mathematics | Year: 2015

The purpose of this work is to study solution techniques for problems involving fractional powers of symmetric coercive elliptic operators in a bounded domain with Dirichlet boundary conditions. These operators can be realized as the Dirichlet-to-Neumann map for a degenerate/singular elliptic problem posed on a semi-infinite cylinder, which we analyze in the framework of weighted Sobolev spaces. Motivated by the rapid decay of the solution to this problem, we propose a truncation that is suitable for numerical approximation. We discretize this truncation using first degree tensor product finite elements. We derive a priori error estimates in weighted Sobolev spaces. The estimates exhibit optimal regularity but suboptimal order for quasi-uniform meshes. For anisotropic meshes instead, they are quasi-optimal in both order and regularity. We present numerical experiments to illustrate the method’s performance. © 2014, SFoCM.

Liu R.,Oak Ridge National Laboratory | Mahurin S.M.,Oak Ridge National Laboratory | Li C.,Oak Ridge National Laboratory | Li C.,Vanderbilt University | And 8 more authors.
Angewandte Chemie - International Edition | Year: 2011

C shells: A facile and versatile synthesis using dopamine as a carbon source gives hollow carbon spheres and yolk-shell Au@Carbon nanocomposites (see pictures). The uniform nature of dopamine coatings and their high carbon yield endow the products with high structural integrity. The Au@C nanocomposites are catalytically active. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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