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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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Transformation of the Vavilov–Cherenkov radiation cone under grazing interaction of a relativistic electron with a layer of substance is theoretically studied. It is shown that this effect can occur when the electron enters the substance layer.
The primary focus of the work was the development of methods for the nonperturbative solution of quantum chromodynamics (QCD) in a form that yields wave functions for the eigenstates, from which hadronic properties can be computed. The principal approach was to use a light-front Hamiltonian formulation. In light-front coordinates, t+z/c plays the role of time, with t the ordinary time, z a space direction, and c the speed of light. This leads to a relativistic formulation that retains useful characteristics of nonrelativistic treatments. A bound state of many constituents can be represented by wave functions that define probabilities for each possible arrangement of internal momenta. These functions satisfy integral equations that can be approximated numerically to yield a matrix representation. The matrix problem can be solved by iterative methods. The approximate wave functions can then be used to compute properties of the bound state. Methods have been developed for model theories and gauge theories, including quantum electrodynamics and theories that are supersymmetric. The work has required the development of new numerical algorithms and computer codes for singular integral equations and eigenvalue problems. A key aspect of the work is the construction of practical procedures for nonperturbative regularization and renormalization. Two methods of regularization have been studied. One is the addition of heavy Pauli--Villars (PV) particles to the Lagrangian, with their metrics and couplings tuned to provide the necessary cancellations in the regularization. The other method of regularization is the addition of supersymmetric partners, to extend a theory to a supersymmetric form. The supersymmetric theories were solved by the supersymmetric discrete light-cone quantization (SDLCQ) method. The most significant accomplishments of the project were the SDLCQ calculation of direct evidence for a Maldacena duality conjecture, construction of a practical light-front quantization for QED in an arbitrary covariant gauge, and invention of the light-front coupled-cluster method, designed to eliminate the need for Fock-space truncations.
This report summarizes testing activities performed at the Pacific Northwest National Laboratory to verify the cone penetrometer load cell can withstand the tank conditions present in 241-AN-101 and 241-AN-106. The tests demonstrated the load cell device will operate under the elevated temperature and radiation levels expected to be encountered during tank farm deployment of the device.
Blanks for synchronizing cones with a sprayed steel coating that are capable of operating in oil within vehicle transmissions are considered. A plasma-spraying method is developed for the manufacture of such components.
Separation and associated heat transfer and pressure distribution on cone cylinder flare configurations
Separation and heat transfer and pressure distribution on cone-cylinder-flare configurations
Design relationships have been derived for the determination of elastic buckling strength levels for unpressurized monocoque truncated cones under axial compression. Theoretical implications have been considered in the establishment of a semi-empirical analysis leading to the development of probability based design expressions. Data from 170 tests by various investigators were statistically evaluated for the expected mean, 90%, and 99% probability strength levels. Dispersion of data was found to be slightly less than that of monocoque cylinders. Non-linear effects of radius to thickness ratio or strength deterioration with length to radius ratio were not discernible.
Drag and static stability for a blunt-nosed 10-deg half-angle cone in hypersonic free-flight
Aerodynamic characteristics at mach 6.77 of 9-deg cone, with and without spherical afterbody and nose blunting at angles of attack to 180-deg
Aerodynamic damping moments of cones with different centers of rotation
Low subsonic stability and control of a 0.34-scale free flying model of a half cone reentry vehicle
Pressure and heat-transfer measurements of flat face of blunted 10 deg half-cone body or semidisk at mach 6.15
Effect of nose bluntness, fineness ratio, cone angle, and model base on aerodynamic characteristics of blunt bodies
Skin temperature and surface pressure of blunted cone-cylinder-flare configuration free flight test vehicle to hypersonic speeds
Effects of gas injection on the heat transfer and pressure distributions on slender cones at hypersonic speeds
Effect of changes in base contour on damping in pitch of blunted cone in wind tunnel
Tables for supersonic flow around right circular cones at zero angle of attack
Cooling of nose cone by ejection of hydrogen and helium from its apex at mach 7