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The Zero-Lift Drag of Several Configurations of the XAAM-N-2 Pilotless Aircraft. TED No. NACA DE332

Description: Free-flight tests have been made to determine the zero-lift drag of several configurations of the XAAM-N-2 pilotless aircraft. Base-pressure measurements were also obtained for some of the configurations. The results show that increasing the wing-thickness ratio from 4 to 6 percent increased the wing drag by about 100 percent at M = 1.3 and by about 30 percent at M = 1.8. Increasing the nose fineness ratio from 5.00 to 6.25 reduced the drag coefficient of the wingless models a maximum of about 0.030 (10 percent) at M = 2.0. A corresponding change in nose shape for the winged models decreased the drag coefficient by about 0.05 in the Mach number range from 1.1 to 1.4; at Mach numbers greater than 1.6 no measurable reduction in drag coefficient was obtained. The drag of the present Sparrow fuselage is less than that of a parabolic fuselage which could contain the same equipment.
Date: March 16, 1950
Creator: Hall, James R. & Sandahl, Carl A.
Partner: UNT Libraries Government Documents Department

Blood-Based Biomarkers: A blood screening test for Alzheimer's disease

Description: This article describes the first-ever multiethnic referent sample that spans community-based and clinic-based populations for implementation of an Alzheimer's disease blood screen.
Date: June 25, 2016
Creator: O'Bryant, Sid E.; Edwards, Melissa; Johnson, Leigh A.; Hall, James R.; Villarreal, Alcibiades E.; Britton, Gabrielle B. et al.
Partner: UNT College of Arts and Sciences