847 research outputs found
Cicero the Homerist
In six letters1 written to Atticus over a span of fourteen years (59-45 BCE), Cicero quotes Iliad 6.442 in whole or in part: [translation ommitted] ("I hesitate before Trojan men and Trojan women with their trailing dresses").2 Cicero uses the line to express his hesitation to the reactions of others to a decision, political or literary, that he feels he must make. He clearly depends upon Atticus' deep knowledge of Greek literature, as he never names the poet, cites the scene or book, or identifies the speaker. He assumes that Atticus will know the passage, in which Hector explains to Andromache why he must return to the fighting or be shamed in front of his fellow Trojans.Issue title: Festschrift for John Miles Foley. This article belongs to a special issue of Oral Tradition published in honor of John Miles Foley's 65th birthday and 2011 retirement. The surprise Festschrift, guest-edited by Lori and Scott Garner entirely without his knowledge, celebrates John's tremendous impact on studies in oral tradition through a series of essays contributed by his students from the University of Missouri-Columbia (1979-present) and from NEH Summer Seminars that he has directed (1987-1996)
Generating Schr\"{o}dinger-cat states in momentum and internal-state space from Bose-Einstein condensates with repulsive interactions
Resonant Raman coupling between internal levels induced by continuous
illumination of non-collinear laser beams can create double-well momentum-space
potentials for multi-level ``periodically-dressed'' atoms. We develop an
approximate many-body formalism for a weakly interacting, trapped
periodically-dressed Bose gas which illustrates how a tunable exchange
interaction yields correlated many-body ground states. In contrast to the case
of a position-space double well, the ground state of stable
periodically-dressed Bose gases with repulsive interactions tends toward a
Schr\"{o}dinger cat state in the regime where interactions dominate the
momentum-space tunnelling induced by the external trapping potential. The
dependence of the momentum-space tunnelling and exchange interaction on
experimental parameters is derived. We discuss how real-time control of
experimental parameters can be used to create Schr\"{o}dinger cat states either
between momentum or internal states, and how these states could be dynamically
controlled towards highly sensitive interferometry and frequency metrology.Comment: 7 pages, 3 figures. Submitted to PR
Direct numerical simulation of gas transfer across the air-water interface driven by buoyant convection
A series of direct numerical simulations of mass transfer across the air-water interface driven by buoyancy-induced convection has been carried out to elucidate the physical mechanisms that play a role in the transfer of heat and atmospheric gases. The buoyant instability is caused by the presence of a thin layer of cold water situated on top of a body of warm water. In time, heat and atmospheric gases diff use into the uppermost part of the thermal boundary layer and are subsequently transported down into the bulk by falling sheets and plumes of cold water. Using a specifically-designed numerical code for the discretization of scalar convection and diffusion, it was possible to accurately resolve this buoyant instability induced transport of atmospheric gases into the bulk at a realistic Prandtl number (Pr = 6) and Schmidt numbers ranging from Sc = 20 to Sc = 500. The simulations presented here provided a detailed insight into instantaneous gas transfer processes. The falling plumes with highly gas-saturated fluid in their core were found to penetrate deep inside the bulk. With an initial temperature difference between the water surface and the bulk of slightly above 2 K peaks in the instantaneous heat flux in excess of 1600 W/m² were observed, proving the potential effectiveness of buoyant convective heat and gas transfer. Furthermore, the validity of the scaling law for the ratio of gas and heat transfer velocities K_L / H_L ∼ (Pr/Sc)^0:5 for the entire range of Schmidt numbers considered was confirmed. A good time-accurate approximation of K_L was found using surface information such as velocity fluctuations and convection cell size or surface divergence. A reasonable time-accuracy for the K_L estimation was obtained using the horizontal integral length scale and the root-mean-square of the horizontal velocity fluctuations in the upper part of the bulk.The German Research Foundation (DFG grant UH242/6-1). Additional funding by the Helmholtz Water Network
Brown-Forman Corporation and the Distilleries Industry
This study showed that Brown-Forman Corporation’s (Brown-Forman) has a winning business strategy. It passes the three major tests, which are the Fit Test, Competitive Advantage Test, and Performance Test. The company’s strategy effectively addresses the company’s situation both internally and externally. The strategy takes advantage of most of the industry’s trends, mitigates the negative impacts of the industry’s driving forces, and ensures that the company meets the industry’s key success factors. It helps the company achieve sustainable competitive advantages by fully utilizing its biggest resources and capabilities.
The strategy has also directly contributed to the company’s financial success and market standing. In comparison to its biggest competitor, Beam Inc. (Beam), Brown-Forman has significantly stronger financial position within the industry. Some of its biggest financial strengths include its ability to generate cash from operations, obtain high returns from invested capital, and create strong, positive cash flows for future acquisitions and shareholder return.
Areas where the company could improve include developing strategies to address changes in regulatory and political environment, developing ways to guarantee a steady supply of their products’ key inputs, and utilizing strategic partnerships for distribution. The company should also consider acquiring companies like the Firefly Distillery and Bacardi to expand their product breadth and geographic reach
A gamma ray monitor for the OSO-7 spacecraft
A 3 in. x 3 in. NaI(Tl) gamma ray (0.3 to 10 MeV) spectrometer with a CsI(Na) charged particle and anti-Compton shield has been developed for the Orbiting Solar Observatory (OSO-7) which was launched September 30, 1971. The instrument, designed for a rotating wheel compartment, utilizes a 377 channel quadratic PHA with accumulation times of 3, 1, or 0.5 minutes. Quick look and calibration data obtained via a direct data link to a minicomputer allows near real time monitoring and control of the experiment. Various commands changing the operating mode can be executed. The functions which can be commanded include: rotation of the quadrants in which data is collected by 90 deg; gain adjustment of the central detector over a 6:1 range; manual or automatic sequencing of calibrations; variations of accumulation times by telemetering selected channels; and selection of reference directions. A small X-ray detector covering the range 7.5 to 120 keV is also included
Coherence-enhanced imaging of a degenerate Bose gas
We present coherence-enhanced imaging, an in situ technique that uses Raman
superradiance to probe the spatial coherence properties of an ultracold gas.
Applying this method, we obtain a spatially resolved measurement of the
condensate number and more generally, of the first-order spatial correlation
function in a gas of Rb atoms. We observe the enhanced decay of
propagating spin gratings in high density regions of a Bose condensate, a decay
we ascribe to collective, non-linear atom-atom scattering. Further, we directly
observe spatial inhomogeneities that arise generally in the course of extended
sample superradiance.Comment: 4 pages, 4 figure
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