Wind-tunnel/flight correlation study of aerodynamic characteristics of a large flexible supersonic cruise airplane (XB-701) 2: Extrapolation of wind-tunnel data to full-scale conditions

The results of calculations necessary to extrapolate performance data on an XB-70-1 wind tunnel model to full scale at Mach numbers from 0.76 to 2.53 are presented. The extrapolation was part of a joint program to evaluate performance prediction techniques for large flexible supersonic airplanes similar to a supersonic transport. The extrapolation procedure included: interpolation of the wind tunnel data at the specific conditions of the flight test points; determination of the drag increments to be applied to the wind tunnel data, such as spillage drag, boundary layer trip drag, and skin friction increments; and estimates of the drag items not represented on the wind tunnel model, such as bypass doors, roughness, protuberances, and leakage drag. In addition, estimates of the effects of flexibility of the airplane were determined

Sediment Based Turbidity Analyses for Representative South Carolina Soils

2012 S.C. Water Resources Conference - Exploring Opportunities for Collaborative Water Research, Policy and Managemen

Choral March; Advance, Britannia!

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Art, Artifact, Archive: African American Experiences in the Nineteenth Century

Angelo Scarlato’s extraordinary and vast collection of art and artifacts related to the Civil War, and specifically to the Battle of Gettysburg, the United States Colored Troops, slavery and the African American struggle for emancipation, citizenship and freedom has proved to be an extraordinary resource for Gettysburg College students. The 2012-14 exhibition in Musselman Library’s Special Collections, curated by Lauren Roedner ’13, entitled Slaves, Soldiers, Citizens: African American Artifacts of the Civil War Era and its corresponding catalogue provided a powerful and comprehensive historical narrative of the period. This fall, students in my course at Gettysburg College “Art and Public Policy”—Diane Brennan, Maura Conley, Abigail Conner, Nicole Conte, Victoria Perez-Zetune, Savannah Rose, Kaylyn Sawyer, Caroline Wood and Zoe Yeoh—selected additional objects of material and print culture from Angelo’s private collection and drew from Lauren’s expertise for the exhibition Art, Artifact, Archive: African American Experiences in the Nineteenth Century to investigate public representations of a newly freed population as well as their more personal perspectives. [excerpt]https://cupola.gettysburg.edu/artcatalogs/1015/thumbnail.jp

Nuclear Reaction Rates in a Plasma

The problem of determining the effects of the surrounding plasma on nuclear reaction rates in stars is formulated ab initio, using the techniques of quantum statistical mechanics. We derive a result that expresses the complete effects of Coulomb barrier penetration and of the influence of the surrounding plasma in terms of matrix elements of well defined operators. We find that possible "dynamical screening" effects that have been discussed in the literature are absent. The form of our results suggests that an approach that relies on numerical calculations of the correlation functions in a classical Coulomb gas, followed by construction of an effective two body potential and a quantum barrier penetration calculation, will miss physics that is as important as the physics that it includes.Comment: 66 pages, revtex, Errors Fixed, Explanation Adde

Variable Stars in the Globular Cluster M5. Application of the Image Subtraction Method

We present $V$-band light curves of 61 variables from the core of the globular cluster M5 obtained using a newly developed image subtraction method (ISM). Four of these variables were previously unknown. Only 26 variables were found in the same field using photometry obtained with DoPHOT software. Fourier parameters of the ISM light curves have relative errors up to 20 times smaller than parameters measured from DoPHOT photometry. We conclude that the new method is very promising for searching for variable stars in the cores of the globular clusters and gives very accurate relative photometry with quality comparable to photometry obtained by HST. We also show that the variable V104 is not an eclipsing star as has been suggested, but is an RRc star showing non-radial pulsations.Comment: submitted to MNRAS, 9 pages, 4 figure