14,093 research outputs found

    I am Me and You are You

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    A collection of fiction short stories about the issue of identity. The stories question the idea of identity on a philosophical level, as well as by what means we frame our identities, and whether is is self-formed or formed by others. A particular tension is related to issues of the Information Age, including social media such as Facebook. Influences include David Foster Wallace, Spalding Gray, Jorge Luis Borges, Tim O\u27Brien, Bruno Schulz, and others

    New Lentil in Upper Fayetteville Formation

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    Arkansas Trilobite from Lower Ordovician Rocks

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    Osagean Trilobites in Arkansas

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    Energy Dependence of Scattering Ground State Polar Molecules

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    We explore the total cross section of ground state polar molecules in an electric field at various energies, focusing on RbCs and RbK. An external electric field polarizes the molecules and induces strong dipolar interactions leading to non-zero partial waves contributing to the scattering even as the collision energy goes to zero. This results in the need to compute scattering problems with many different values of total M to converge the total cross section. An accurate and efficient approximate total cross section is introduced and used to study the low field temperature dependence. To understand the scattering of the polar molecules we compare a semi-classical cross section with quantum unitarity limit. This comparison leads to the ability to characterize the scattering based on the value of the electric field and the collision energy.Comment: Accepted PRA, 10 pages, 5 figure

    Biological CO oxidation in the Sargasso Sea and in Vineyard Sound, Massachusetts

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    Author Posting. © The Author(s), 2005. This is the author's version of the work. It is posted here by permission of American Society of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 50 (2005): 1205-1212.In situ dissolved carbon monoxide (CO) in oligotrophic waters follows a diel cycle varying from 0.3 to 0.5 nmol L-1 before dawn to 2.5 to 3 nmol L-1 in early afternoon, when photo-production of CO exceeds biological CO oxidation and other sinks. Coastal waters may contain up to 15 nmol L-1 [CO] in the daytime. Assays to measure the rate of CO bio-oxidation typically involve the addition of labeled CO to sealed samples, resulting in CO concentrations that are above ambient levels during incubation (up to 9 nmol L-1 CO). We find that biological oxidation of CO obeys first-order kinetics when incubated with up to 4 nmol L-1 [CO] in coastal water samples and up to between 4 and 10.8 nmol L-1 in oligotrophic waters. At higher [CO], kinetic behavior transitions to zero-order or saturation kinetics. CO–oxidation rate coefficients obtained in dark incubations were not representative of the entire diurnal period, as others have assumed. Biological CO–oxidation rate coefficients kco measured in dark incubations of Sargasso Sea surface water in summer were 0.020 ± 0.002 h-1 (mean ± standard deviation) and an order of magnitude greater than those measured in situ during daylight hours (0.002 ± 0.001 h-1). Dark and in situ rate coefficients in early spring were 0.006 ± 0.004 h-1 and 0.003 ± 0.001 h-1, respectively. In dark incubations of Vineyard Sound water, kco was 0.127 ± 0.038 h-1. The apparent half-saturation constant Kapp for CO ranged from 2.04 to 5.44 nmol L-1 CO in both environments.This research was supported by National Science Foundation grants OCE-98-11208 and OCE-01-36876, and the Reinhard Coastal Research Center and Coastal Ocean Institute grant BI-10918
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