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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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At least 145 records · Page 8

All sources NASA NTRS DOE OSTI

NASA NTRS1962

Development of techniques for forming segments of a parabolic solar concentrator

This report covers a comprehensive research study of Androforming, explosive forming, and stretch forming as applied to shaping a parabolic reflector segment for use in a solar furnace. Development efforts were directed toward attaining accurate part contour, and assurance of process reproducibility. The three forming processes mentioned above were investigated by qualified contractors. Three test segments formed by each method along with a detailed analysis were submitted to MSFC. It was concluded that optimum results could be obtained with the stretch forming process. The three test segments of the solar concentrator tha.t were produced by this method, and evaluated optically, revealed a maximum contour deviation of O. 76 degrees.

P.H. Schuerer↗

NASA NTRS1968

An application of the power series method to solution of the first boundary value problem for an equation of a parabolic type

Solution of first boundary value problem for parabolic equation using power series method

Filchakov, P. F.↗

NASA NTRS1969

Motion sickness susceptibility under weightless and hypergravity conditions generated by parabolic flight

Graybiel, A.↗

NASA NTRS1969

Motion sickness precipitated in the weightless phase of parabolic flight by Coriolis accelerations

Human motion sickness susceptibility when exposed to Coriolis accelerations during parabolic flight weightlessness

Graybiel, A.↗

NASA NTRS1968

Computed radiation patterns of a thermally distorted 30-foot ATS F and G parabolic reflector antenna

Radiation patterns for thermally distorted, 30 ft Applications Technology Satellite parabolic antenna computed using digital techniques

Schmidt, R. F.↗

NASA NTRS1968

On the optimal control of a system governed by a linear parabolic equation with white noise inputs.

Optimal control of system governed by linear parabolic equation with white noise inputs, using mathematical model to generate distributed system analog

Kushner, H. J.↗

NASA NTRS1968

Numerical analysis of an elliptic-parabolic partial differential equation.

Boundary value problem for elliptic-parabolic partial differential equations in theory of random processes, obtaining analytical solution in terms of hypergeometric functions

Franklin, J. N.↗

NASA NTRS1969

Motion sickness precipitated in the weightless phase of parabolic flight by Coriolis accelerations.

Human susceptibility to motion sickness under Coriolis acceleration during parabolic flight weightlessness

Graybiel, A.↗

NASA NTRS1969

Motion sickness susceptibility under weightless and hypergravity conditions generated by parabolic flight.

Motion sickness susceptibility during parabolic flight, comparing weightlessness and hypergravity effects on normal and labyrinthine-defective subjects

Graybiel, A.↗

NASA NTRS1970

Near parabolic solutions of the two-body problem

Near parabolic solutions of two body problem using Kepler equations

Estes, R. H.↗

NASA NTRS1965

Parabolic reflector horn feed with spillover correction Patent

Device for improving efficiency of parabolic reflector horn for linearly or circularly polarized waves

Nixon, D. L.↗

NASA NTRS1969

Derivation of twelve-by-twelve staffness matrix for shear panel undergoing parabolic deformation

Equations for stiffness matrix for 12-node shear panel undergoing parabolic deformation

Muller, G.↗

NASA NTRS1969

A millimeter wave parabolic antenna for communications with a synchronous satellite

Satellite mounted mm wave parabolic dish antenna for tracking communication satellite in synchronous orbit

Eby, R. J.↗

NASA NTRS1970

Thermal analysis of the 14-foot deployable parabolic antenna

Thermal analysis of deployable parabolic antenna for Outer Planetary Explorer program, discussing spacecraft spin and radioisotope thermoelectric generators effect

Kay, S.↗

NASA NTRS1970

Use of exponentials in the integral solution of the parabolic equations of boundary layer, wake, jet, and vortex flows

Incompressible laminar boundary layer, vortex and axisymmetric wake/jet flow parabolic equations solution by weighted residuals method, describing use of exponentials

Bossel, H. H.↗

NASA NTRS1970

Changes and improvements in the construction of large Cassegrain antennae with parabolic hornreflector feeds

Beam equalization in large Cassegrain antennas with parabolic horn reflector feeds

Trentini, G. V.↗

NASA NTRS1973

Manufacture of large, lightweight parabolic antennas

Antenna was produced in segments. Parabole sections were built up as aluminum foil sandwich with core bonded by film adhesive; whole structure was oven-cured after assembly. Structure was assembled with special tool for splice-bonding segments into complete dish, and inflatable bladder to apply pressure at joints during cure.

Hooper, S. W.↗

NASA NTRS1973

A stability analysis for a semilinear parabolic partial differential equation

The parabolic partial differential equation considered is u sub t = u sub xx + f(u), where minus infinity x plus infinity and o t plus infinity. Under suitable hypotheses pertaining to f, a class of initial data is exhibited: phi(x), minus infinity x plus infinity, for which the corresponding solutions u(x,t) appraoch zero as t approaches the limit of plus infinity. This convergence is uniform with respect to x on any compact subinterval of the real axis.

Chafee, N.↗