282 research outputs found
David A. Caughey and Francis C. Moon discuss the history of the Sibley School and Fluid Mechanics
No full textThis video is an oral history interview of David Caughey by Frank Moon on April 18, 2014.1_jg5q9j7
ROTATIONAL RELAXATION WITHIN
No full textT. A. Caughey and D. R. Crosley, J. Chem. Phys. 69, 3379 (1978).Author Institution:Rates for collision-induced transfer from a single rotational level () to other individual rotational levels within the vibrational level of the state of are reported. The was excited by atomic Zn line radiation, and rotationally resolved fluorescence measurements were used to determine the rates for the collision partners He, Ar and Xe. Single collision multiquantum transfer is found, but (for transfer) with a magnitude which decreases with . For small transfer is preferred over . A surprisal plot for transfer is linear for with the following slopes: He, 4.6; Ar, 3.4; Xe: 1.9. These results and those for vibrational and total rotational indicate a brief collision encounter
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How to Become an Author: The Art and Business of Literary Advice Handbooks
No full textThis dissertation reads the archive of literary advice texts that erupted into the world of letters beginning in the mid-1880s alongside the work of Henry James, Jack London, Arnold Bennett, and Virginia Woolf. At that moment, fiction, to adapt a phrase of Edward Gibbon, was elevated into an art and degraded into a trade. The agitated coupling of art and commerce made authorship seem available and attractive on an unprecedented scale. All manner of instructional texts, from how-to manuals to plot charts, and from author interviews to fictions about fiction making, sated this sudden explosion of interest. United by a post-Romantic faith that novelists, though born to varying degrees of talent, could be made, this enterprise mobilized emerging knowledge practices and media technologies in its effort to develop a practical science of fiction, one I dub “fictioneering.”My central field of study is not so much the “how-to” documents themselves as the practices they produced, the processes they allowed, and the techniques they fostered. In attending to fictioneering, I expose how the doctrine of the autonomous literary object arose as part of the formation of the discipline of English literature from a sort of sleight of hand. In the case of the novel, technique, which was first articulated as a writer’s tool, subtly morphed into an inherent feature of the text, dormant until uncovered by the skilled reader. “How to Become an Author” tells the story of an unexpected rivalry between fictioneering and the new-born science of literary criticism, a rivalry that profoundly shaped the signature techniques of both
Polyandric acid A, a clerodane diterpenoid from the Australian medicinal plant Dodonaea polyandra, attenuates pro-inflammatory cytokine secretion in vitro and in vivo
No full textPublished: January 8, 2014Dodonaea polyandra is a medicinal plant used traditionally by the Kuuku I'yu (Northern Kaanju) indigenous people of Cape York Peninsula, Australia. The most potent of the diterpenoids previously identified from this plant, polyandric acid A (1), has been examined for inhibition of pro-inflammatory cytokine production and other inflammatory mediators using well-established acute and chronic mouse ear edema models and in vitro cellular models. Topical application of 1 significantly inhibited interleukin-1β production in mouse ear tissue in an acute model. In a chronic skin inflammation model, a marked reduction in ear thickness, associated with significant reduction in myeloperoxidase accumulation, was observed. Treatment of primary neonatal human keratinocytes with 1 followed by activation with phorbol ester/ionomycin showed a significant reduction in IL-6 secretion. The present study provides evidence that the anti-inflammatory properties of 1 are due to inhibition of pro-inflammatory cytokines associated with skin inflammation and may be useful in applications for skin inflammatory conditions including psoriasis and dermatitis.Bradley S. Simpson, Xianling Luo, Maurizio Costabile, Gillian E. Caughey, Jiping Wang, David J. Claudie, Ross A. McKinnon, and Susan J. Sempl
A Numerical Investigation Of Turbulence-Driven And Forced Generation Of Internal Gravitywaves In Stratified Mid-Water
No full textNatural and externally-forced excitation of internal gravity waves in a uniformly stratified fluid have been thoroughly investigated by means of highly resolved large eddy simulations. The first part of the thesis focuses on the generation of high frequency internal gravity waves by the turbulent wake of a towed sphere in a uniformly stratified fluid. We have used continuous wavelet transforms to quantify relevant wavelength and frequencies and their spatial and temporal dependence in the near field of the wake. The dependence on Reynolds number and Froude number of the internal wave field wavelengths, frequencies and isopycnal displacements are reported for the first time. The initial wavelengths and decay rates show a dependence on both parameters that can not be explained on the basis of impulsive mass source models. The results also clearly identify Reynolds number as the main driver for the observed selection of a narrow range of wave phase- line-tilt-angles and shed some light on the coupling of the waves and turbulent wake region at high Reynolds number. Finally, the potential for nonlinear interactions, instability and breaking of the waves increases with both Reynolds and Froude numbers. The results of this part of the thesis motivate future theoretical investigations into the underlying generation mechanisms and improved parametrization of the role of small scale processes, such as high frequency internal gravity waves, in large scale circulation models in the ocean and atmosphere. In the second half of the thesis, we have focused on the generation of an internal gravity wavepacket by a vertically localized transient forcing. We have found that the unique combination of strong vertical localization and large wave amplitude, typically not considered in the literature, lead to the formation of strong horizontal mean flow inside the wave forcing region that nonlinearly grows at the expense of a depleted and structurally modified emerging internal wave packet. A novel theoretical analysis is developed which can explain the underlying mechanism for the formation of the mean flow. By appealing to scaling arguments, based on a one way wave-mean flow interaction, we quantify the mean flow dependence on the input parameters. By means of a phase averaging procedure, we offer additional insight on mean flow reduction through horizontal localization of a wavepacket. Finally, mean flow containment techniques that allow the generation of a well-defined wavepacket that preserves its structure near the source and during the propagation towards a remote interaction region are proposed and tested. The efficiency of the techniques is tested in a simulation of internal gravity wave-shear flow interaction near a critical level. The simulations qualitatively agree with previous numerical investigations of such flow
Implicit multigrid Euler solutions with symmetric Total-Variation-Diminishing dissipation
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President Hushang Bahar Interviews, 1986
No full textTranscript of a series of 1986 interviews with the College's first President, Hushang Bahar. Interview condensed by Nancy Craft from the original video interviews.
Interview #1 transcribed by Patty Caughey; #2 and #3 by Darlene Finn; and #4 by Lisa Doran.Archived web conten
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