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 SPS4: SPS IV - Physics Applications |
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Chair: Paul Schulze, Abilene Christian University Room: Foster Science Building 417 |
Saturday, March 24, 2007 10:40AM - 10:52AM |
SPS4.00001: Optical Tweezers at Angelo State University Andy Russell, Toni Sauncy Simple plans for the development of an optical tweezers apparatus can be found in current literature. The optical tweezes is based on utilizing force gradients produced by well focused light and can be used to manipulate very small samples ($<$600nm) without direct contact. The physics required to understand the optical tweezers is accessible to undergraduate students, making the experiment attractive for advanced undergraduate teaching labs. An optical tweezers apparatus has been constructed at Angelo State University and is currently being tested for its feasibility as a tool for investigating delicate biological samples. [Preview Abstract] |
Saturday, March 24, 2007 10:52AM - 11:04AM |
SPS4.00002: Elastic scattering in heterogeneous media: numerical tests Kunal Bhatnagar, Christian Poppeliers We hypothesize that the degree of elastic scattering is a function of the size scale of heterogeneities. To test this hyptothesis, we simulated elastic seismic waves in media whose heterogenieties varied in size and then compute beam power using common beam forming techniques. By stacking the seimsic data along a given beam direction, we determined the power of the RMS stack as a function of incident angle. We find that when the size scale of the scattering heterogeneities approach the wavelength of the elastic wavefield, the degree of scattering increases. The increased scattering expresses itself as a greater degree of off-incident arrivals. [Preview Abstract] |
Saturday, March 24, 2007 11:04AM - 11:16AM |
SPS4.00003: Viewing the World from the Inside Out: Computed Tomography Jennifer Hendryx, Daniel Bullock Computed tomography (CT) has a variety of important applications extending from industry to the biological realm. A CT scanner requires a source of radiation, a detector, motion control, and software that coordinates the entire apparatus. Construction of a simple, low-cost CT scanner with low radiation emission is in progress, with the most notable advances taking place in motion control. [Preview Abstract] |
Saturday, March 24, 2007 11:16AM - 11:28AM |
SPS4.00004: Partial Volume Computed Tomography Artifacts Daniel Bullock, Charles Allen Computed Tomography (CT) is a method used to recreate elements in a ``black box'' object of interest. One type of artifact in the reconstructed image is created by the finite size of the source and detector that is not accounted for in the ideal assumptions underlying the mathematical reconstruction process. An aggregate ray path based simulator is being used to show CT artifacts resulting from the slice partial volume and the detector partial volume. The goal is to quantify the level of artifact produced by the fraction of exposure. [Preview Abstract] |
Saturday, March 24, 2007 11:28AM - 11:40AM |
SPS4.00005: The Cylindrical Squid Jose Martinez |
Saturday, March 24, 2007 11:40AM - 11:52AM |
SPS4.00006: 3-D Animated Ray Tracing Luke Whittlesey |
Saturday, March 24, 2007 11:52AM - 12:04PM |
SPS4.00007: Exploring The Challenges and Methods of Building a Homemade Hovercraft Jonathan Currey |
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