SEARCH · Search NASA
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Microwave properties of uniformly magnetized slabs filling cross section of rectangular lossless waveguide operating in specific modes
Initial condition effects on weak homogeneous turbulence with uniform shear, studying energy transfer and dissipation
Centrally cracked sheet, calculating riveted and uniformly spaced stringers effect on stress intensity factor
Minimum mass isotropic shells of revolution under uniform pressure and axial loads
Description of techniques for preparing metallic structures with parallel, uniformly sized pores
Numerical solutions of compressible laminar boundary layer heat transfer and pressure drop of gas in uniformly heated tube
Stress intensity factor calculated for cracked sheet with riveted and uniformly spaced stringers
Effects of spanwise variation of gust velocity on alleviation system designed for uniform gust velocity across span
Preparation of sintered nickel plaques under varied experimental conditions for development of laboratory process to manufacture uniform and reliable nickel cadmium battery plate materials
Stability of incompressible two-fluid wheel flows with imposed uniform axial magnetic field for gas core nuclear rockets
Grid turbulence interaction with uniform mean shear flow, examining initial disturbance length scale effects
Power series uniformization by transformations of perturbation functions irregular part, considering compatibility problem
Linear neutral differential equation uniform asymptotic stability relation to perturbed differential equation containing bounded linear operators
Battery materials and manufacturing methods were analyzed with the aim of developing uniform and predictable battery plates for nickel cadmium aerospace cells. A study is presented for the high temperature electrochemical impregnation process for the preparation of nickel cadmium battery plates. This comparative study is set up as a factorially designed experiment to examine both manufacturing and operational variables and any interaction that might exist between them. The manufacturing variables in the factorial design include plaque preparative method, plaque porosity and thickness, impregnation method, and loading, The operational variables are type of duty cycle, charge and discharge rate, extent of overcharge, and depth of discharge.
Methods are presented for the generation of random numbers with uniform and normal distributions. Subprogram listings of Fortran generators for the Univac 1108, SDS 930, and CDC 3200 digital computers are also included. The generators are of the mixed multiplicative type, and the mathematical method employed is that of Marsaglia and Bray.
An experimental investigation was conducted to determine the flow characteristics of a circular free helium jet having an initially uniform velocity profile. Complete velocity profiles are presented at Reynolds numbers of 1027 and 4571 at 0, 3, 6, 10, 15, and 20 nozzle diameters (where possible) from the nozzle exit. Centerline velocity decay and potential core length were obtained over a range of Reynolds numbers from 155 to 5349 at distances up to and including 25 nozzle diameters from the nozzle exit. The angles of spread associated with the diffusion of the jet downstream of the nozzle are also given. Axial jet momentum flux and entrained mass flux, at various distances downstream of the nozzle, are presented as a function of the jet Reynolds number.
This article describes a Lorentz-like transformation between a fixed frame and an inertial frame that is free falling due to the presence of a uniform gravitation field. The application to the clock paradox problem and some connections with similar works are also discussed.
The problem of the transmission of sound in a duct with very thin shear layers at the walls is treated by an inner expansion method. The results show that the formulation of the problem of the transmission of sound in a duct with a shear layer at the wall converges, in the case of a vanishingly thin shear layer, to the formulation of the same problem when uniform flow is assumed and the wall boundary condition is that of continuity of particle displacement.