(Parametrized) First Order Transport Equations: Realization of Optimally Stable Petrov-Galerkin Methods

We consider ultraweak variational formulations for (parametrized) linear first order transport equations in time and/or space. Computationally feasible pairs of optimally stable trial and test spaces are presented, starting with a suitable test space and defining an optimal trial space by the application of the adjoint operator. As a result, the inf-sup constant is one in the continuous as well as in the discrete case and the computational realization is therefore easy. In particular, regarding the latter, we avoid a stabilization loop within the greedy algorithm when constructing reduced models within the framework of reduced basis methods. Several numerical experiments demonstrate the good performance of the new method

Hurricane Katrina: a content analysis of media framing, attribute agenda setting, and tone of government response

This study content analyzed print media coverage of government response from four newspapers in the five weeks immediately after Hurricane Katrina, looking for common frames, attribute agenda setting, and tone. In addition, it assessed week-to-week differences throughout coverage. Findings indicate that the order of Semetko and Valkenburg\u27s (2000) common frames changed, emphasizing human interest first. Conflict, attribution of responsibility, economic consequences, and morality frames followed. Media\u27s use of attribute agenda setting was evident throughout coverage, primarily emphasizing the issues, relief and rescue, economic, negative timeliness, and rebuilding and repairing. Media\u27s tone of government response was moderately neutral with federal tone covered more positively, and local tone covered more negatively. Frames and issue attribute varied throughout coverage, however, tone did not. This study recognized media\u27s use of framing, attribute agenda setting, and tone, thereby offering a better understanding of how print media portray government response during a natural disaster

How Oxygen-Binding Affects Structural Evolution of Even-Sized Gold Anion Clusters. (Size Range 20 to 34)

We report a joint anion photoelectron spectroscopy (PES) and theoretical study to investigate the effect of O2-binding on the mid-sized even-numbered gold clusters, Aun− (n = 20−34), a special size region of bare gold clusters that entail rich forms of structural evolution and transformation. Specifically, within this size range, bare Au20− is a highly-symmetric pyramidal cluster, bare Au21-25− are flat-planar or hollow-tubular clusters, bare Au26− is the smallest core-shell gold cluster, while bare Au34− is a magic-number/fluxional core-shell cluster with the high-symmetry tetrahedral Au4 core. In light of the strong size-dependent structural evolution of bare gold clusters in the n = 20−34 size range, we focused especially on the chemical interplay between the O2 binding and the structure of the host gold clusters. The global minima of the O2-bound gold clusters AunO2− are searched using the basin-hopping global optimization technique in conjugation with density functional theory calculations. Vertical detachment energies are computed for the low-lying isomers with the inclusion of spin−orbit effects for gold to generate simulated photoelectron spectra and to compare with the experimental PES spectra. Based on the global−minimum structures identified, a series of structural transitions, from the pyramidal to fused−planar to core-shell structures, are identified for the AunO2− clusters, where the O2 binding is found to be in either superoxo or peroxo fashion, depending on the size and shape of the host gold clusters. Advisor: Xiao Cheng Zen

Laboratory And Astronomical Detection Of The Negative Molecular Ion C3N-

The negative molecular ion C3N- has been detected at millimeter wavelengths in a low-pressure laboratory discharge, and then with frequencies derived from the laboratory data in the molecular envelope of IRC+10216. Spectroscopic constants derived from laboratory measurements of 12 transitions between 97 and 378 GHz allow the rotational spectrum to be calculated well into the submillimeter-wave band to 0.03 km s(-1) or better in equivalent radial velocity. Four transitions of C3N- were detected in IRC+10216 with the IRAM 30 m telescope at precisely the frequencies calculated from the laboratory measurements. The column density of C3N- is 0.5% that of C3N, or approximately 20 times greater than that of C4H- relative to C4H. The C3N- abundance in IRC+10216 is compared with a chemical model calculation by Petrie & Herbst. An upper limit in TMC-1 for C3N- relative to C3N (< 0.8%) and a limit for C4H- relative to C4H (< 0.004%) that is 5 times lower than that found in IRC+10216, were obtained from observations with the NRAO 100 m Green Bank Telescope (GBT). The fairly high concentration ofNRFKorean government MEST 2012R1A1A1014646, 2012M4A2026720Southeast Physics Network (SEP-Net)Science and Technology Facilities Council ST/F002858/1, ST/I000976/1Swedish Research Council 2009-4088U.S. NSF AST-0708176, AST-1009799NASA NNX07AH09G, NNG04G177G, NNX11AE09GChandra grant SAO TM8-9009XBiochemistr

Untitled (Red)

A 1989 untitled lithograph by artist G. Brunken.https://scholarworks.moreheadstate.edu/university_art_collection/1168/thumbnail.jp

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