Predicted thermal response of a cryogenic fuel tank exposed to simulated aerodynamic heating profiles with different cryogens and fill levels

A two dimensional finite difference thermal model was developed to predict the effects of heating profile, fill level, and cryogen type prior to experimental testing the Generic Research Cryogenic Tank (GRCT). These numerical predictions will assist in defining test scenarios, sensor locations, and venting requirements for the GRCT experimental tests. Boiloff rates, tank-wall and fluid temperatures, and wall heat fluxes were determined for 20 computational test cases. The test cases spanned three discrete fill levels and three heating profiles for hydrogen and nitrogen

What's Become of Our Bliss? The politics of recognition: Reconsidered transracialism and transfiguration in Ralph Ellison's Juneteenth

How do we create a true politics of inclusion, what Nelson Mandela has called a "non-racial democracy"? This essay argues for the importance of artistic representations of a "multiracial imagined community" in helping us to imagine a more attractive alternative to the "diseased imagination" of racialism. Ralph Ellison was an Oklahoma writer who emphasized our cultural inter-relatedness as a means of helping achieve a more inclusive politics. His novel Juneteenth illustrates the role of the arts in articulating a moral philosophy which can help create the change in consciousness which is a necessary precondition of reconstructive social move­ments. All reform requires coalitions, and coalitions require new vision: new para­digms to facilitate social and cultural awakening. Juneteenth critiques the root paradigm of racialism, and challenges the pieties of identity politics regarding how to create a new pattern. This essay concludes by applying the novel's complex dramatization of "the true inter-relatedness of blackness and whiteness" to con­temporary identity politics, such as racialized commentary about controversial Caucasian rap artist Eminem

Halfies, Half-Written Letters, and One-Eyed Gods: Connecting the Dots of Communicative Cultures

This essay distills the theory of communicative cultures as a tool for cultural analysis. Nadine Gordimer’s line about the difficulties of returning to “half-written letters” is used to frame anthropology’s critique of “bounded culture” or “container cultures,” predominat in Cultural Studies. Anthropologists Lila Abu-Lughod and Kirin Narayan have described “halfies” as in-between peoples who can help us understand fluid, processual cultures as normative. Building on this stance, and the work of rhetorical genre scholars, Stephens defines communicative cultures as “a set of shared commitments expressed through cultural means.” This approach to cultural analysis, in which literature is viewed as an “ethnographic resource,” is illustrated through an analysis of Jamaican writer Olive Senior’s story “Country of the One Eye God.” The repeating patterns in Jamaican culture which this approach reveals, it is suggested, point to the wider utility of communicative cultures as an analytical concept

Unveiling Cultural Filters: Teaching “The Veil” in Puerto Rico and Saudi Arabia

A freshman English course designed to spark critical thinking in cross-cultural contexts for ESL students was taught in the Middle East (Spring, 2014) and in the Caribbean (Fall, 2014). The university experience was framed as a rite of passage. As models of how to narrate in-between-ness, students read stories from Coming of Age around the World. “The Veil” by Marjane Satrapi provoked dichotomized responses. This essay is a comparative analysis of student response to this excerpt from Satrapi’s graphic novel, Persepolis. Students’ voices are excerpted to illustrate how their respective dominant cultures—Wahabi Islam in Arabia, and U.S. mass media in Puerto Rico—acted as filters, veiling what they could see in this text. This essay surveys multi-disciplinary scholarship on veiling, as well as the critical reception of Persepolis, to suggest how Satrapi’s preferred reading, embedded in the visual narrative, challenges readers to see beyond apparent binary of “freedom” vs. “the veil.

D03. OTC and SBDC: Services and Updates

Corresponding author (Office of Technology Commercialization): Gregory Sechrist, [email protected]://egrove.olemiss.edu/pharm_annual_posters/1025/thumbnail.jp

On climate response to changes in the cosmic ray flux and radiative budget

We examine the results linking cosmic ray flux (CRF) variations to global climate change. We then proceed to study various periods over which there are estimates for the radiative forcing, temperature change and CRF variations relative to today. These include the Phanerozoic as a whole, the Cretaceous, the Eocene, the Last Glacial Maximum, the 20th century, as well as the 11-yr solar cycle. This enables us to place quantitative limits on climate sensitivity to both changes in the CRF, Phi_CR, and the radiative budget, F, under equilibrium. Under the assumption that the CRF is indeed a climate driver, we find that the sensitivity to CRF variations is consistently fitted with mu := -Phi_0 (dT_global/ d Phi_CR) = 6.5 +/- 2.5 K (where Phi_0 is the CR energy flux today). Additionally, the sensitivity to radiative forcing changes is lambda := dT_global/ dF_0 = 0.35 +/- 0.09 K/(W/m^2), at the current temperature, while its temperature derivative is negligible with d lambda / dT_0 = 0.01 +/- 0.03 1/(W/m^2). If the observed CRF/climate link is ignored, the best sensitivity obtained is lambda = 0.54 +/- 0.12 K/(W/m^2) and d lambda / dT_0 = -0.02 +/- 0.05 1/(W/m^2). The CRF/climate link therefore implies that the increased solar luminosity and reduced CRF over the previous century should have contributed a warming of 0.37+/-0.13 K, while the rest should be mainly attributed to anthropogenic causes. Without any effect of cosmic rays, the increase in solar luminosity would correspond to an increased temperature of 0.16+/-0.04 K.Comment: 12 pages, 7 figures, submitted to JGR-Atmosphere

New black holes in the brane-world?

It is known that the Einstein field equations in five dimensions admit more general spherically symmetric black holes on the brane than four-dimensional general relativity. We propose two families of analytic solutions (with g_tt\not=-1/g_rr), parameterized by the ADM mass and the PPN parameter beta, which reduce to Schwarzschild for beta=1. Agreement with observations requires |\beta-1| |\eta|<<1. The sign of eta plays a key role in the global causal structure, separating metrics which behave like Schwarzschild (eta<0) from those similar to Reissner-Nordstroem (eta>0). In the latter case, we find a family of black hole space-times completely regular.Comment: 4 pages, RevTeX, 3 eps figures, final version to appear in Phys. Rev.

Approach for Structurally Clearing an Adaptive Compliant Trailing Edge Flap for Flight

The Adaptive Compliant Trailing Edge (ACTE) flap was flown on the National Aeronautics and Space Administration (NASA) Gulfstream GIII testbed at the NASA Armstrong Flight Research Center. This smoothly curving flap replaced the existing Fowler flaps creating a seamless control surface. This compliant structure, developed by FlexSys Inc. in partnership with the Air Force Research Laboratory, supported NASA objectives for airframe structural noise reduction, aerodynamic efficiency, and wing weight reduction through gust load alleviation. A thorough structures airworthiness approach was developed to move this project safely to flight. A combination of industry and NASA standard practice require various structural analyses, ground testing, and health monitoring techniques for showing an airworthy structure. This paper provides an overview of compliant structures design, the structural ground testing leading up to flight, and the flight envelope expansion and monitoring strategy. Flight data will be presented, and lessons learned along the way will be highlighted

Changes in temperature and precipitation extremes in the IPCC ensemble of global coupled model simulations

Temperature and precipitation extremes and their potential future changes are evaluated in an ensemble of global coupled climate models participating in the Intergovernmental Panel on Climate Change (IPCC) diagnostic exercise for the Fourth Assessment Report (AR4). Climate extremes are expressed in terms of 20-yr return values of annual extremes of near-surface temperature and 24-h precipitation amounts. The simulated changes in extremes are documented for years 2046–65 and 2081–2100 relative to 1981–2000 in experiments with the Special Report on Emissions Scenarios (SRES) B1, A1B, and A2 emission scenarios. Overall, the climate models simulate present-day warm extremes reasonably well on the global scale, as compared to estimates from reanalyses. The model discrepancies in simulating cold extremes are generally larger than those for warm extremes, especially in sea ice–covered areas. Simulated present-day precipita-tion extremes are plausible in the extratropics, but uncertainties in extreme precipitation in the Tropics are very large, both in the models and the available observationally based datasets. Changes in warm extremes generally follow changes in the mean summertime temperature. Cold ex-tremes warm faster than warm extremes by about 30%–40%, globally averaged. The excessive warming of cold extremes is generally confined to regions where snow and sea ice retreat with global warming. With th

The effect of horizontal resolution on Indian monsoon depressions in the Met Office NWP model

Monsoon depressions are synoptic scale features that are responsible for a significant fraction of the rain over northern India during the summer monsoon season, and, as such, it is important to quantify their structure and behaviour in numerical weather prediction models. It is known that increasing model resolution is strongly correlated with improved forecasts in the short term and global circulation in the longer term, as well as better representation of tropical cyclones; here, we explore the sensitivity of depressions to changes in resolution using the Met Office Unified Model. Seven NWP case studies of depressions from 2013-15 were run at eight resolutions corresponding to equatorial grid spacing of between 16 and 208 km, and compared with data for the same events from TRMM and ERA-Interim reanalysis. We found that at the low resolution end of the spectrum, increases in resolution led to improvements in the composite structure, but with diminishing returns. The model also persistently overestimated the depression intensity, in particular the wind speed and the warm core aloft -- with the source appearing to originate in the mid-troposphere. The sensitivity of the diurnal cycle to resolution was also explored: the stratiform component was found to be very well represented by the model, whereas the convective component was described quite poorly. Improvement in most components of structure with increasing model resolution were marginal beyond N320 (63 km) and N512 (39 km) for dynamic and thermodynamic fields respectively