Turbulent shock waves in plasmas.
Turbulent electrostatic shock in plasmas, discussing determination of structure by ion wave instabilities
IONIC WAVE↗
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Results for “Structure Determination”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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On minimum time and fuel orbital transfer.
The problem of a maneuverable spacecraft, with limited thrust capability, moving between two coplanar circular earth orbits is considered. Thrusting is performed in the plane defined by the circles, so that the nonlinear dynamics and subsequent optimization problem are simplified. The approach used in this paper differs from the approaches of Edelbaum and Goetz in that the equations of motion are not linearized before formulating the optimization problem. An averaging approximation is used to determine the structure of the significant co-state variables.
Stuart G. Greenberg↗
Factors affecting flow separation in contoured supersonic nozzles.
Separated flow in two dimensional and axisymmetric nozzles with various wall contours, determining flow structure and shock-boundary layer interaction
Lawrence, R. A.↗
X-ray and neutron diffraction studies of the high-temperature beta-phase of the AgBiSe sub 2 /AgBiS sub 2 system.
X ray and neutron diffraction studies of NaCl type beta phases of silver-bismuth selenide/sulfide, determining crystal structure
Glatz, A. C.↗
Seismographic recording of large rocket engine operation
Recording equipment for rocket engine vibration is adaptable to determining the structural strength of building materials. This seismographic system is portable and is capable of measuring displacements in the direction of three mutually perpendicular axes.
Dalins, I.↗
Development of an Advanced Annular Combustor
The objective of the effort described in this report was to determine the structural durability of a full-scale advanced annular turbojet combustor using ASTM A-1 type fuel and operating at conditions typical of advanced supersonic aircraft. A full-scale annular combustor of the ram-induction type was fabricated and subjected to a 325-hour cyclic endurance test at conditions representative of operation in a Mach 3.0 aircraft. The combustor exhibited extensive cracking and scoop burning at the end of the test program. But these defects had no appreciable effect on combustor performance, as performance remained at a high level throughout the endurance program. Most performance goals were achieved with pressure loss values near 6% and 8%, and temperature rise variation ratio (deltaTVR) values near 1.25 and l.22 at takeoff and cruise conditions, respectively. Combustion efficiencies approached l004 and the exit radial temperature profiles were approximately as desired.
Rusnak, J. P.↗
Rotational spectrum of ethylene episulfoxide.
Rotational spectrum of ethylene episulfoxide to determine molecular structure, particularly orientation of C sub 2 S ring
White, W. F.↗
The lanthanum-rhodium system.
La-Rh system study by powder X ray diffraction, metallographic and differential thermal analysis, constructing equilibrium diagram and determining crystal structure data
Raman, A.↗
Deduction of ionospheric parameters from retarding potential analyzers.
Retarding potential analyzers determining ionospheric structure, noting linearization of analysis
Patterson, T. N. L.↗
A method for determining aerodynamic damping of the structural bending modes with application to the Apollo/Saturn 1 launch vehicle
Comparison of damping derivatives and wind tunnel data of structural bending modes of Saturn 1
Meadows, M. T.↗
Interpretation of XUV spectroheliograms.
Chromospheric structural parameters determined from XUV spectroheliograms, discussing He 2 emission, O 4 and O 5 emission distribution, etc
Zirin, H.↗
Collisionless shocks in plasmas
Collisionless shocks in plasmas, dissipation and dispersion in determining shock structure
Friedman, H. W.↗
Differential games, dynamic optimization, and generalized control theory
Generalized control theory, discussing criterion function, pareto-optimal set determination, information structure, etc
Ho, Y. C.↗
Rising-plate rheometer
Technique eliminates hazards of handling propellants and permits determination of structure index of gel by remote control. Rheometer weighs cone of propellant gel which remains on a disc that has been slowly pulled out of the gel.
Globus, R. H.↗
Nondestructive testing of microtab welds
Introduction of sinusoidal signal across welded structure to determine reliability of integrated circuit connections is discussed. In-phase frequencies and quadrature frequency functions are used to evaluate weld reliability. Schematic diagram of test equipment and components is provided.
Feinstein, L.↗
Nondestructive testing for braze voids in thin panels by use of special coatings
Application of commercial coating to exterior of sandwich panel structures for determining presence of voids in brazed plates is discussed. Procedure for applying coating material and method of conducting nondestructive tests are explained. Illustrations are included to show appearance of voids.
Gibson, J. C.↗
Thermally stable macro-composite structures
Studies and experiments on the use of bimetallic lattice structures for determining and controlling thermal expansion characteristics are discussed.
Schuerch, H. U.↗
Computer analysis of two-dimensional fatigue flaw-growth problems
A description is given of a computer program for analyzing the crack propagation in cyclic loaded structures. By using equations for the stress intensity factors for surface and embedded flaws, the capability of ascertaining lengthwise crack growth as well as crack growth through the thickness of the structure was determined. Equations used are written in general form so that many other types of crack growth problems, such as through the thickness type cracks, can be analyzed. Provisions have been made in the computer program to analyze crack growth for repeated blocks of variable-amplitude fatigue load spectra. Additional features of the computer program include a variable print interval and a variable integration interval to minimize computer printout and computer run time. A source listing and instructions for using the computer program are included.
Forman, R. G.↗