Mr. Zebra Man

Pages 4-1

Junior Recital: Brandon Bell, saxophone

This recital is presented in partial fulfillment of the requirements for the degree Bachelor of Music in Performance Mr. Bell studies saxophone with Sam Skeltonhttps://digitalcommons.kennesaw.edu/musicprograms/1649/thumbnail.jp

Numerical Study of Shock-Wave Boundary Layer Interaction on a Compression Ramp Gap

The effect of a gap between a at plate and a compression ramp on the shock wave/boundary layer interaction (SWBLI) at the ramp corner is investigated numerically. The behavior of supersonic flow over compression ramps where SWBLI occurs has been a topic of study, numerically and experimentally, for many years. There have been studies on how the interaction occurs and how to mitigate its effects. This investigation will focus on the effect of placing a gap in front of the ramp.Using ANSYS Fluent and a Spalart-Allmaras turbulence model, two 3D models experience Mach 3 flows at a ramp angle of 24° with and without a gap. Steady state simulations highlight the characteristic features of SWBLIs on compression ramps (separation point, reattachment point, and recirculation region) and how these features are altered by the presence of the gap. Span-wise averaging is performed to represent pressure, temperature, and skin friction surface data, and these data are used to analyze the effect of the gap. The hypothesis is that the addition of the gap will lower the negative effect of the SWBLI on the surface. Additional test cases are created to observe the effect of angle of attack change, boundary layer height change, and Mach number change on the gap.With the addition of the gap, the SWLBI recirculation region is found to move from the corner into the gap and the shock impinges directly from the corner of the ramp. This changes the location of pressure and temperature loading on the surfaces. The average temperature is lower with the addition of the gap, but the amount of pressure loading across the surfaces stays within 1%. The pattern of skin surface friction on the ramp, however, changes dramatically when the gap is added. The skin friction coefficeint value decreases by 100% at top of the ramp when the gap is added. The present research introduces and investigates a scarcely covered technique to help mitigate or control the effects of SWBLI on a compression ramp and addresses possible work to follow-up this study

Southern portraits

Photography to me is a passion for recording fractions in time, which evoke a deep response in myself, and the viewer. The response can be one of wonder, love, hate, laughter, or camaraderie. While living and photographing in the gentle South, I am most concerned with and intrigued by portraying her people. My intent is to explore man, his familial characteristics, his sense of community, and his relationship with those around him

An Assessment of the Academic Impact of Shock Society Members

Professional society membership enhances career development and productivity by offering opportunities for networking and learning about recent advances in the field. The quality and contribution of such societies can be measured in part through the academic productivity, career status, and funding success rates of their members. Here, using Scopus, NIH RePORTER, and departmental websites, we compare characteristics of the Shock Society membership to those of the top 55 NIH-funded American university and hospital-based departments of surgery. Shock Society members' mean number of publications, citations and H-indices were all significantly higher than those of non-members in surgery departments (P < 0.001). A higher percentage of members also have received funding from the NIH (42.5% vs. 18.5%, P < 0.001). Regression analysis indicated that members were more likely to have NIH funding compared with non-members (OR 1.46, 95% CI 1.12-1.916). Trauma surgeons belonging to the Shock Society had a higher number of publications and greater NIH funding than those who did not (130.4 vs. 42.7, P < 0.001; 40.4% vs. 8.5%, P < 0.001). Aggregate academic metrics from the Shock Society were superior to those of the Association for Academic Surgery and generally for the Society of University Surgeons as well. These data indicate that the Shock Society represents a highly academic and productive group of investigators. For surgery faculty, membership is associated with greater academic productivity and career advancement. While it is difficult to ascribe causation, certainly the Shock Society might positively influence careers for its members

Senior Recital

List of performers and performances

Orbital migration of interacting low-mass planets in evolutionary radiative turbulent models

The torques exerted by a locally isothermal disk on an embedded planet lead to rapid inward migration. Recent work has shown that modeling the thermodynamics without the assumption of local isothermality reveals regions where the net torque on an embedded planet is positive, leading to outward migration of the planet. When a region with negative torque lies directly exterior to this, planets in the inner region migrate outwards and planets in the outer region migrate inwards, converging where the torque is zero. We incorporate the torques from an evolving non-isothermal disk into an N-body simulation to examine the behavior of planets or planetary embryos interacting in the convergence zone. We find that mutual interactions do not eject objects from the convergence zone. Small numbers of objects in a laminar disk settle into near resonant orbits that remain stable over the 10 Myr periods that we examine. However, either or both increasing the number of planets or including a correlated, stochastic force to represent turbulence drives orbit crossings and mergers in the convergence zone. These processes can build gas giant cores with masses of order ten Earth masses from sub-Earth mass embryos in 2-3 Myr.Comment: 15 pages, 11 figures. Accepted for publication in Ap

A Dark Spot on a Massive White Dwarf

We present the serendipitous discovery of eclipse-like events around the massive white dwarf SDSS J152934.98+292801.9 (hereafter J1529+2928). We selected J1529+2928 for time-series photometry based on its spectroscopic temperature and surface gravity, which place it near the ZZ Ceti instability strip. Instead of pulsations, we detect photometric dips from this white dwarf every 38 minutes. Follow-up optical spectroscopy observations with Gemini reveal no significant radial velocity variations, ruling out stellar and brown dwarf companions. A disintegrating planet around this white dwarf cannot explain the observed light curves in different filters. Given the short period, the source of the photometric dips must be a dark spot that comes into view every 38 min due to the rotation of the white dwarf. Our optical spectroscopy does not show any evidence of Zeeman splitting of the Balmer lines, limiting the magnetic field strength to B<70 kG. Since up to 15% of white dwarfs display kG magnetic fields, such eclipse-like events should be common around white dwarfs. We discuss the potential implications of this discovery on transient surveys targeting white dwarfs, like the K2 mission and the Large Synoptic Survey Telescope.Comment: ApJ Letters, in pres