Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session H34: Five Decades of Physics at ExxonMobil Corporate Strategic ResearchInvited Undergraduate
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Sponsoring Units: FIAP Chair: Hubert King, Exxon Mobil Corporation Room: BCEC 205A |
Tuesday, March 5, 2019 2:30PM - 3:06PM |
H34.00001: Physics at ExxonMobil Corporate Strategic Research: Today and Tomorrow Invited Speaker: Amy Herhold TBD |
Tuesday, March 5, 2019 3:06PM - 3:42PM |
H34.00002: How Scientific Research at ExxonMobil in the 1980's showed the way for solar electricity 35 years later Invited Speaker: T Tiedje TBD |
Tuesday, March 5, 2019 3:42PM - 4:18PM |
H34.00003: Roll and Stumble: A robust mechanism for efficient self-organization of granular matter Invited Speaker: Sabyasachi Bhattacharya A monolayer of granular spheres in a cylindrical vial, driven continuously by an orbital shaker and subjected to a symmetric confining centrifugal potential, self-organizes to form a distinctively asymmetric structure which occupies only the rear half-space. Imaging shows that the regulation of motion of individual spheres occurs via toggling between two types of motion, namely, rolling and sliding. Experiments demonstrate and simulations confirm that the global features of the structure are maintained robustly by an auto-tuning of the effective friction through internal dynamical states of rolling and sliding which provides a protocol-insensitive route to self-organization of a driven many-body system. Recent results show that restricting the motion of the system to a quasi-2 D space leads to efficient crystallization. Relation of two forms of locomotion to more general scenarios of autotuning of friction, as in chemotaxis of bacteria and prevention of stampede in crowd dynamics, will be speculated upon. |
Tuesday, March 5, 2019 4:18PM - 4:54PM |
H34.00004: Optimal Sound Absorption Metastructures: Practical Solutions from Fundamental Physics Invited Speaker: Ping Sheng Even in the 21st century, noise still constitutes a major environmental problem, with the low frequency noise being especially pernicious. While resonance-based acoustic metamaterials can display many novel wave manipulation capabilities, they have the Achilles’ heel of being narrow-frequency in character. It would be most desirable if a sound absorber can be designed to fit the noise spectrum, with a minimum allowed thickness. Such sound absorbing structures can now be realized through a design recipe that incorporates the causality constraint on the acoustic response1. We use the causality constraint to delineate what is ultimately possible for sound absorbing structures, and denote those which can attain near-equality for the causality constraint to be "optimal." Anchored by the causality relation, an integration strategy can be formulated for realizing structures with target-set absorption spectra and a sample thickness close to the minimum value as dictated by the causality constraint. By using this approach, we have realized a 10.86 cm-thick structure that exhibits a broadband, near-perfect flat absorption spectrum starting at around 400 Hz, while the minimum sample thickness from the causality constraint is 10.36 cm. To illustrate the versatility of the approach, two additional optimal structures with different target absorption spectra are presented. This "absorption by design" strategy would enable the tailoring of customized solutions to difficult room acoustic and noise remediation problems. |
Tuesday, March 5, 2019 4:54PM - 5:30PM |
H34.00005: Pore-scale study of multiphase flow in porous media Invited Speaker: Dave Weitz TBD |
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