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Glue Film Thickness Measurements by Spectral Reflectance

Description: Spectral reflectance was used to determine the thickness of thin glue layers in a study of the effect of the glue on radiance and reflectance measurements of shocked-tin substrates attached to lithium fluoride windows. Measurements based on profilometry of the components were found to be inaccurate due to flatness variations and deformation of the tin substrate under pressure during the gluing process. The accuracy of the spectral reflectance measurements were estimated to be ±0.5 μm, which was… more
Date: September 20, 2010
Creator: Marshall, B. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equivalent-Circuit Model for the TSM Resonator with a Viscoelastic Layer

Description: This paper describes a new equivalent-circuit model for the thickness shear mode resonator with a surface viscoelastic layer operating near film resonance. The electrical impedance of the film is represented by a simple three-element parallel circuit containing a resistor, a capacitor, and an inductor. These elements describe the film's viscous power dissipation, elastic energy storage, and kinetic energy storage, respectively. Resonator response comparisons between this lumped-element model an… more
Date: September 16, 1999
Creator: Bandey, Helen L.; Cernosek, Richard W.; Hillman, A. R. & Martin, Stephen J.
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Partner: UNT Libraries Government Documents Department
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X-ray fluorescence technique for measuring coating thickness

Description: An x-ray fluorescence technique has been evaluated for measuring the coating thickness of two coating-substrate combinations. A quantitative theory has been developed in conjunction with the experimental data to support the results of the investigation. Results of measurements of zinc coatings on iron and nickel coatings on uranium are given. (auth)
Date: February 22, 1974
Creator: Coulter, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lift and moment characteristics at subsonic Mach numbers of four 10-percent-thick airfoil sections of varying trailing-edge thickness

Description: Report presenting the results of a wind-tunnel investigation of the lift and moment characteristics of four 10-percent-thick circular-arc airfoil sections. Increases in the trailing-edge thickness were found to result in increases in maximum lift coefficient and lift-curve slope at all Mach numbers as well as increases in lift-divergence Mach number at all lift coefficients.
Date: December 20, 1950
Creator: Summers, James L. & Page, William A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flight Tests to Determine the Effect of Airfoil Section Profile and Thickness Ratio on the Zero-Lift Drag of Low-Aspect-Ratio Wings at Supersonic Speeds

Description: Report discussing flight tests of airplane-like models to determine the effect of airfoil section profile and thickness ratio on the zero-lift drag of low-aspect-ratio wings at supersonic speeds. Five rectangular wings with the same aspect ratio and a variety of airfoil thicknesses were tested to determine the effect of thickness ratio.
Date: February 9, 1948
Creator: Katz, Ellis
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Plating Thickness Tester

Description: An electromagnetic eddy current instrument is described that is capable of measuring copper and nickel plating 1 to 8 mils thick plated on bismuth mandrils of various sizes and shapes.
Date: November 15, 1957
Creator: Fitch, C. E., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of Turbine Stator-Blade-Outlet Boundary-Layer Characteristics and a Comparison With Theoretical Results

Description: Report presenting an investigation of the boundary-layer characteristics at the mean radius immediately downstream of a typical turbine stator blade over a range of blade-outlet critical-velocity ratio from 0.8 to 1.16. Total boundary-layer momentum thickness for the blade and individual thicknesses obtained for the suction and pressure surfaces are compared with values calculated from the turbulent-boundary-layer theory.
Date: March 16, 1956
Creator: Whitney, Warren J.; Stewart, Warner L. & Miser, James W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equivalent-Circuit Model for the Thickness-Shear Mode Resonator with a Viscoelastic Film Near Film Resonance

Description: We derive a lumped-element, equivalent-circuit model for the thickness shear mode (TSM) resonator with a viscoelastic film. This modified Butterworth-Van Dyke model includes in the motional branch a series LCR resonator, representing the quartz resonance, and a parallel LCR resonator, representing the film resonance. This model is valid in the vicinity of film resonance, which occurs when the acoustic phase shift across the film is an odd multiple of {pi}/2 radians. This model predicts accurate… more
Date: September 16, 1999
Creator: Bandey, Helen L.; Brown, Mark J.; Cernosek, Richard W.; Hillman, A. Robert & Martin, Stephen J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A study of eddy current measurement (1986-1987)

Description: A study was conducted in 1986 to evaluate a modified eddy current system for measuring copper thickness on Kapton. Results showed a measurement error of 0.42 {mu}in. for a thickness range of 165 to 170 {mu}in. and a measurement variability of 3.2 {mu}in.
Date: June 22, 1989
Creator: Ramachandran, R.S. & Armstrong, K.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Graphical Big Picture for Tank Technologies

Description: A graphical method is presented for comparing different tank technologies and evaluating scalability, over wide ranges of volume and pressure. Mass contours are plotted on log-log graphs of pressure versus volume, using either theory or data points representing hardware. The simple theoretical case for infinitely scaleable tanks made of a single isotropic material has a constant value of PV/m over the entire plot, and results in straight diagonal mass contours. The contours become more complica… more
Date: June 15, 2007
Creator: Whitehead, J C
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Relation of Journal Bearing Performance to Minimum Oil-Film Thickness

Description: Note presenting the minimum thickness of the oil film as used as a basic variable in performance curves of plain journal bearings under steady load. The load capacity and the predicted film thickness at the hook point of the friction curves are shown to correlate with the peak-to-valley values of surface roughness when misalignment is absent.
Date: April 1958
Creator: Ocvirk, F. W. & DuBois, G. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Thickness on the Lateral Force and Yawing Moment of a Sideslipping Delta Wing at Supersonic Speeds

Description: Note presenting calculations, based on linearized supersonic flow theory and on the additional assumption that the Mach cones yaw with the wing, to determine the effect of thickness on the lateral force and yawing moment of a sideslipping delta wing at supersonic speeds. Generalized equations are derived for delta wings with rhombic profile and constant thickness ratio.
Date: January 1949
Creator: Margolis, Kenneth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The transonic aerodynamic characteristics of structurally related wings of low aspect ratio having a spanwise variation in thickness ratio-transonic bump technique

Description: Report presenting an investigation of wings of aspect ratios of 4, 3, and 2 with a plan-form taper ratio of 0.5 and a thickness taper ratio of 0.33 to determine their transonic longitudinal characteristics and effects of tapering thickness ratio. Results regarding the combined effects of aspect ratio and thickness ratio and effects of tapered thickness ratio are provided.
Date: April 12, 1954
Creator: Cleary, Joseph W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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