Bulletin of the American Physical Society
2007 Joint Spring Meeting of the Texas Sections of APS, AAPT, and SPS
Volume 52, Number 2
Thursday–Saturday, March 22–24, 2007; Abilene, Texas
Session APS4: APS IV - Applied Physics, Biophysics, Space Physics |
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Chair: Wayne Keith, McMurry University Room: Foster Science Building 350 |
Saturday, March 24, 2007 10:40AM - 10:52AM |
APS4.00001: Using Seismology to Map and Characterize the Glacial Bed in the Onset Region of Ice Stream D, West Antarctica Bridget McEwen Climate change has affected the flow of ice streams in the West Antarctic Ice Sheet (WAIS). In order to predict the future behavior of the ice streams in the WAIS, an understanding and characterization of the glacial bed is necessary. From analyzing the strength of the seismic reflection of the bed, information can be extracted about the composition of the bed, such as the reflection coefficient. Evidence from previous investigation has determined that the bed under Ice Stream D is composed of glacial till. Results from further research support the previous research. Future research on Ice Stream D could help explain and predict flow behavior and how this will affect the drainage and the future of the WAIS. [Preview Abstract] |
Saturday, March 24, 2007 10:52AM - 11:04AM |
APS4.00002: ABSTRACT WITHDRAWN |
Saturday, March 24, 2007 11:04AM - 11:16AM |
APS4.00003: Molecular Simulation of the docking of meso-tetrakis(4-sulfonatophenyl) porphyrin (TSPP) to b-lactoglobulin dimer. Ivan Silva, Samual Sansone, Lorenzo Brancaleon Data from fluorescence-quenching experiments and fluorescence-lifetime reveal that TSPP interacts with the Trp residues of BLGA. Fluorescence-lifetime measurements were compiled and identified possible Trp residues responsible for binding. We have run molecular simulation of the docking of TSPP monomers to BLGA dimmers using the Arguslab software. Simulations reveal that the interaction is driven by the four negative charges on TSPP which keep the porphyrin on the surface of the protein. [Preview Abstract] |
Saturday, March 24, 2007 11:16AM - 11:28AM |
APS4.00004: Pinning Enhancement on Minute Rare Earth Doped TFA-MOD YBCO Film Hui Fang, Gan Liang, Brandon Harrison, Jason Carpenter, Paul Barnes Rare earth substitution for yttrium has been proved an efficient method to enhance in-field properties of YBCO coated conductor. Studies have been explored on large amount (10 $\sim $ 30{\%}) substitution as well as small amount (1 $\sim $ 10{\%}) substitution. More recently, successful results have been reported on minute (less than 1 {\%}) rear earth substitution on YBCO film by using pulsed laser deposition (PLD) method. Chemical solution deposition method is an easy scale-up, low cost method to fabricate YBCO film. In this study, minute rare earth (Tb, Nd) doped YBCO films are prepared using Trifluoroacetic acid metalorganic deposition (TFA-MOD) method. The precursor solution is deposited on LAO single crystal substrate by using spinning coating method. The epitaxial YBCO films are obtained via a two-step heat treatment. The characterizations of films including microstructure, Tc, field dependence Jc will be reported. The relationship between dopant amount, Jc-H behavior, and microstructure evalution is being investigated and will be presented. [Preview Abstract] |
Saturday, March 24, 2007 11:28AM - 11:40AM |
APS4.00005: Microwave Properties of a Select Liquid Crystal James Roberts, Aman Anand, Jai N. Dahiya A resonant cavity in the TE$_{011 }$mode is used to study the microwave dielectric response of liquid crystal p-azoxyanisole at microwave frequencies. The dielectric behavior of this liquid crystal is studied at 8.0 GHz to 10.2 GHz. The complex dielectric constant of liquid crystals are calculated by using Slater's Perturbation Equations and the relaxation time is calculated using Debye's Equation for polar molecules. The microwave resonant cavity is interfaced to a computer and the dielectric relaxation data is taken using this computer interface. The frequency shift and the Q-changes of the microwave resonant signal are determined experimentally by controlling the position of the markers through a computer. By placing the markers on the microwave signal of the resonant cavity manually is very time consuming and at the same time introduces lots of error in the experimental data. With the use of the computer interfaced resonant cavity this error is reduced dramatically and a large set of data points are taken in a much shorter time. The computer performed the calculations of the complex dielectric constant of the material under study and at the same time plots graphs of frequency shifts and Q-changes as a function of applied frequency for this experiment related to the microwave dielectric response of liquid crystal p-azoxyanisole. [Preview Abstract] |
Saturday, March 24, 2007 11:40AM - 11:52AM |
APS4.00006: Mass energy space and time system theory Cao Dayong Develop the relativity theory and Develop the microcosmic mechanics. Microcosmic quantum space time theory. Microcosmic quantum black hole theory. Dark Energy background come from black hole, we would use it to produce the microcosmic quantum black hole. With the microcosmic quantum space time theory and microcosmic quantum black hole theory, we could produce new spaceflight. [Preview Abstract] |
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