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 POS: Poster Session |
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Chair: Michael Sadler, Abilene Christian University Room: CBS Rotunda |
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POS.00001: Substructure in the Galactic Halo Kenneth Carrell, Ronald Wilhelm New and exciting evidence for stellar substructure is being discovered in our Galactic halo. This poster will highlight the development of a more rigorous and quantitative way to characterize some of these structures. The use of kinematic, spatial and chemical abundance data for a large sample of stars along with a novel clustering technique will be used to achieve this goal. Some preliminary results will also be shown. [Preview Abstract] |
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POS.00002: Some consequences of violating Newton's third law Scott Hill The field of ``social physics'' uses physical concepts to explain and study the behavior of crowds, traffic, and similar phenomena. One common method in the field uses the notion of ``social forces'' to explain the interaction of individual particles such as people or cars. Social forces differ from physical forces, however, in that they do not necessarily follow Newton's Third Law. For example, the optimal distance between two people in conversation varies with culture and individual, so that while one person may be perfectly comfortable, the other person may feel they are too close together or too far apart, thus feeling a repulsive or attractive ``force.'' The consequences of this type of third-law violation is the subject of our research. Specifically, we investigate a system with two types of particles on a lattice: one species is unaffected by the proximity of other particles, while the other experiences a short-range repulsive force from particles of either type. We compare the characteristics of this model with a similar two-species model in which Newton's Third Law is not violated. [Preview Abstract] |
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POS.00003: Near-Threshold S-wave Positron-Hydrogen Ionization Krista Jansen, S.J. Ward, J. Shertzer, J.H. Macek We have used the hyperspherical hidden crossing method to compute the S-wave positron-hydrogen ionization cross section near threshold. For total angular momentum zero, we expanded the adiabatic Hamiltonian about the saddle point associated with the Wannier ridge. Our results are consistent with previous values of the Wannier exponent [1] and second order correction terms to the threshold law [2,3]. By calculating the transition probability within the reaction zone we were able to determine the absolute S- wave positron-hydrogen ionization cross section near threshold. S.J. W. and J.S. acknowledge support from NSF, under a collaborative grant (PHYS- 0440714, PHYS-0440565). [1] H. Klar, J. Phys. B 14, 4165 (1981). [2] W. Ihra, J. H. Macek, F. Mota-Furado and P.F. O'Mahony, Phys. Rev. Lett. 78, 4027 (1997). [3] James Sternberg, S. J.Ward, J. H. Macek and J. Shertzer, Bull. Am. Phys. Soc. 49, 52 (2004). [Preview Abstract] |
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POS.00004: Dark Side of Black Hole Theories Sunil Thakur Mystery of black hole originates from some very complex mathematics of the theory of relativity. Current theory of black holes has several inherent contradictions. Black holes have temperature and our current understanding of the radiation laws suggest that a body with temperature must emit radiation. One of the features of black holes is that density of the black hole decreases as the mass increases. Mathematics cannot be used to justify a practically untenable theory. Volume remaining constant, increase in mass must lead to increase in density. Constancy of the speed of light still needs to be conclusively established. We have been able to reduce the speed of the light to as low as 38 miles per and also in excess of the 3 lakh meters per second. These experiments suggest that temperature affect speed of light. Huge variations in the temperatures do exist in the universe. These anomalies need to be resolved in any theory on black holes. This paper suggests that black holes are created when components of the atoms get separated and mass of the proton, electron, and neutron gets concentrated in separate regions. This observation is supported by our observations of existence of black holes, neutron stars, and white dwarfs in close proximity. Existence of matter devoid of energy creates high-energy zone or accretion disk around the black hole. Gravitational pull is exerted by the accretion disk that attracts light towards it resulting in formation of light cones resulting in illusion of clusters of stars near the site of the black holes. [Preview Abstract] |
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POS.00005: Study of the Physical Properties of Titanium Sheath in Ti-sheathed MgB2 Superconducting Wires Cad Hoyt, Jeffrey P. Diehl, Hui Fang, Gan Liang To evaluate the possibility of using titanium(Ti)-sheathed MgB2 superconducting wires for future lightweight superconducting magnet applications, it is necessary to obtain information about the electrical, magnetic, and structural properties of the Ti sheath material. In this paper, we report the results from our recent electrical resistivity, magnetization, and crystal structure measurements on these Ti-sheath materials. [Preview Abstract] |
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POS.00006: South Texas Chapter, Health Physics Society A.E. Evans, K. Blanchard The South Texas Chapter of the Health Physics Society offers a day-long presentation on nuclear science/radiation technology suitable for presentation to grade 4-12 students. This course includes sections on fundamentals of radiation, natural and man-made sources of radiation, radiation applications, biological effects/risks of radiation, nuclear waste management, and radiation safety regulation and practices. We offer to give this course without cost to groups of up to 25 teachers in your community. A notebook and CD of the material taught, together with a working Geiger Counter, and lunch are given to each student. If interested, contact or (281)937-9413. [Preview Abstract] |
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