Classical Hadrodynamics: A New Approach to Ultrarelativistic Heavy-Ion Collisions

We discuss a new approach to ultrarelativistic heavy-ion collisions based on classical hadrodynamics for extended nucleons, corresponding to nucleons of finite size interacting with massive meson fields. This new theory provides a natural covariant microscopic approach that includes automatically spacetime nonlocality and retardation, nonequilibrium phenomena, interactions among all nucleons and particle production. In the current version of our theory, we consider $N$ extended unexcited nucleons interacting with massive neutral scalar ($\sigma$) and neutral vector ($\omega$) meson fields. The resulting classical relativistic many-body equations of motion are solved numerically without further approximation for soft nucleon-nucleon collisions at $p_{\rm lab}$ = 14.6, 30, 60, 100 and 200 GeV/$c$ to yield the transverse momentum imparted to the nucleons. For the future development of the theory, the isovector pseudoscalar ($\pi^+$, $\pi^-$, $\pi^0$), isovector scalar ($\delta^+$, $\delta^-$, $\delta^0$), isovector vector ($\rho^+$, $\rho^-$, $\rho^0$) and neutral pseudoscalar ($\eta$) meson fields that are known to be important from nucleon-nucleon scattering experiments should be incorporated. In addition, the effects of quantum uncertainty on the equations of motion should be included by use of techniques analogous to those used by Moniz and Sharp for nonrelativistic quantum electrodynamics.Comment: 6 pages, LA-UR-94-217

Recommendations for Future Efforts in RANS Modeling and Simulation

The roadmap laid out in the CFD Vision 2030 document suggests that a decision to move away from RANS research needs to be made in the current timeframe (around 2020). This paper outlines industry requirements for improved predictions of turbulent flows and the cost-barrier that is often associated with reliance on scale resolving methods. Capabilities of RANS model accuracy for simple and complex flow flow fields are assessed, and modeling practices that degrade predictive accuracy are identified. Suggested research topics are identified that have the potential to improve the applicability and accuracy of RANS models. We conclude that it is important that some part of a balanced turbulence modeling research portfolio should include RANS efforts

Samuel Beckett’s ‘Ill Seen’: Visual Impairment in the Late Dramatic Works

　　Samuel Beckett’s critics have often written about his “aesthetics of impoverishment,” focusing on the ways in which Beckett impaired verbal language. Following the lead of those critics who have focused on the “ill said” in Beckett’s work, this paper traces Beckett’s use of the “ill seen”―i.e. the ways in which Beckett impaired the visual dimensions of his late dramatic works

Stephen Dedalus in the Library: A Portrait of the Actor as a Young Man

James Joyce’s Ulysses contains an astonishing number of literary adaptations, the most prominent being Homer’s Odyssey and Shakespeare’s Hamlet. Among their many correspondences, Stephen Dedalus and Hamlet have been linked because of their shared artistic temperaments. Yet, neither Stephen nor Hamlet has any significant artistic output, which raises the question of how the reader can reasonably confer artistic status on them. This paper argues that both Stephen’s and Hamlet’s artistry derives from their role as performers in the works they inhabit. Stephen’s exposition on Shakespeare has been called a theory, lecture, and hypothesis. More than any of these, however, it is a performance. By examining the various strategies Joyce used to portray Stephen as a performer and his Shakespeare theory as a performance, this paper sheds light on an aspect of Joyce’s use of Shakespeare that has been little examined. In the library episode of Ulysses, Joyce adopted a dramatic, or performative mode to take on Shakespeare at his own game. In doing so, Joyce created a protagonist to rival Hamlet, and set himself up as a rival to the world’s greatest dramatist

The Ransom and Sarah Williams Farmstead: Post-Emancipation Transitions of an African American Family in Central Texas Vol. 1

In conjunction with the proposed construction of the southwest segment of State Highway 45 in southern Travis County, the Texas Department of Transportation sponsored archeological testing and data recovery efforts at the Ransom Williams farmstead. Prewitt and Associates, Inc., conducted an interdisciplinary community-based historic archeological study of the farmstead from 2005 through 2011. Extensive archival research reveals that the 45-acre farm was owned and occupied by Ransom Williams and his wife Sarah, both former slaves, from about 1871 to ca. 1905. The Williams family lived in the predominantly white rural community of Bear Creek, but they had connections to the nearby freedmen communities of Antioch Colony in northern Hays County and Manchaca in southern Travis County. The stories of the Ransom Williams family and their connections to these communities are enhanced by extensive oral history research, with over 46 hours of taped and transcribed interviews with 27 descendant community members. Data recovery investigations focused on a landscape archeological study to define the layout and design of the entire farmstead, including a stock pond and a network of dry-laid rock walls that facilitated water drainage, demarcated property boundaries, and formed livestock pens. Intensive hand excavations were used to examine features associated with the Williams house, outbuildings and activity areas, and a large trash midden. This work recovered more than 26,000 artifacts. They constitute an impressive material culture assemblage that is associated, with few exceptions, with the Williams family tenure on the land. The combined archival data, oral history interviews, and archeological evidence tell the fascinating story of how one African American farm family lived and thrived in central Texas during Reconstruction and into the Jim Crow era

The Effects of a Native Fish Reintroduction on Resident Fish Assemblages

Native fish reintroduction can be a valuable conservation tool used to curb declines in biodiversity. Previous native fish reintroduction projects have focused on monitoring population responses of the target species, yet potential changes in the resident fish assemblages have received less attention. The reintroduction of the Bluebreast Darter (Etheostoma camurum) to the Upper Licking River basin in Ohio was used as a model to understand how reintroduction may alter resident fish assemblages. This reintroduction began in 2016, with one additional year of stocking in 2017, and yearly follow-up surveys through 2019. Fish community, water-chemistry, and fluvial geomorphic measurements were also performed at the reintroduction sites. I found that the benthic fish assemblage diversity and evenness increased over time in response to the reintroduction, with coarser substrate emerging as an important mechanism of reintroduction success. Both diversity and evenness increased post reintroduction, peaking in 2018 and then dropping back down to similar levels at the beginning of the project. This research helps to better understand how reintroductions may impact aquatic assemblage architecture and inform future reintroduction efforts.No embargoAcademic Major: Environmental Scienc