Toward a unified set of low-thrust mission analysis techniques.
Low thrust mission analysis techniques and computer programs, discussing electric propulsion
Horsewood, J. L.↗
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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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Toward a unified set of low-thrust mission analysis techniques Interim report
Low thrust mission analysis and computer programs
Horsewood, J. L.↗
Geology - Regional setting
Lunar topographical and geological features examined by Surveyor program
Morris, E. C.↗
Modified camera records lens settings on film
Camera is modified by inserting optical imaging system between lens and film. This system requires no electrical power, is low in weight, and adds nothing to external size of the camera.
Thompson, R. E.↗
Two sets of linearized aircraft equations of motion for control system analysis
Developing mathematical model for tandem rotor helicopter for analysis of automatic approach and landing system
Rempfer, P. S.↗
Geologic maps of early Apollo landing sites of set C
Geological maps of potential Apollo landing sites on lunar surface
Trask, N. J.↗
Reduction and analysis of two sets of electron content measurements permitting the inference of electron density in the solar wind Final report
Reduction and analysis of electron content measurements permitting inference of electron density in solar wind
Croft, T. A.↗
Effect of plastic set on thermal conductance at light loading
Feasibility of using elastic deformation to predict heat transfer rates across joined smooth-metal surfaces under high vacuum conditions and light loads
Mckinzie, D. J., Jr.↗
An interactive graphical data set maintenance program
Graphical display computer program for OAO2 operations scheduling system
Greville, E. M.↗
A test set for integration of data compression/ error correction encoding techniques. II - Error correction encoding considerations
Error correction coding/decoding techniques integration, discussing convolutional and block coding and Viterbi, Sequential and Threshold decoding algorithms
Cain, J. B.↗
Geologic setting of the Apollo 14 samples
Apollo 14 lunar module landing site geology, studying samples from regolith and block ejecta deposit around young crater
Hait, M. H.↗
Setting the objectives of organizations
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Churchman, C. W.↗
Control of functional differential equations to target sets in function space
Optimal control of systems governed by functional differential equations of retarded and neutral type is considered. Problems with function space initial and terminal manifolds are investigated. Existence of optimal controls, regularity, and bang-bang properties are discussed. Necessary and sufficient conditions are derived, and several solved examples which illustrate the theory are presented.
Banks, H. T.↗
Plastic set of smooth large radii of curvature thermal conductance specimens at light loads
Thermal contact conductance test data at high vacuum were obtained from two Armco iron specimens having smooth, large radii of curvature, convex, one-half wave length surfaces. The data are compared with calculations based on two macroscopic elastic deformation theories and an empirical expression. Major disagreement with the theories and fair agreement with the empirical expression resulted. Plastic deformation of all the contacting surfaces was verified from surface analyzer statistics. These results indicate that the theoretical assumption of macroscopic elastic deformation is inadequate for accurate prediction of heat transfer with light loads for Armco iron specimens similar to those used in this investigation.
Mckinzie, D. J., Jr.↗
Plastic set of smooth large radii of curvature thermal conductance specimens at light loads.
Thermal contact conductance test data at high vacuum were obtained from two Armco iron specimens having smooth, large radii of curvature, convex, one-half wave length surfaces. The data are compared with calculations based on two macroscopic elastic deformation theories and an empirical expression. Major disagreement with the theories and fair agreement with the empirical expression resulted. Plastic deformation of all the contacting surfaces was verified from surface analyzer statistics. These results indicate that the theoretical assumption of macroscopic elastic deformation is inadequate for accurate prediction of heat transfer with light loads for Armco iron specimens similar to those used in this investigation.
Mckinzie, D. J., Jr.↗
Use of multiple basis sets in the Brueckner-Goldstone many-body perturbation theory for atomic problems.
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Ishihara, T.↗
A qualitative study of the complete set of solutions of the differential equation of motion of a test particle in the equatorial plane of the Kerr gravitational field
A study is made of the mathematical solution of the differential equation of motion of a test particle in the equatorial plane of the Kerr gravitational field, using S (Schwarzschild-like) coordinates. A qualitative solution of this equation leads to the conclusion that there can only be 25 different types of orbits. For each value of a, the results are presented in a master diagram for which h and e are the parameters. A master diagram divides the h, e parameter space into regions such that at each point within one of these regions the types of admissible orbits are qualitatively the same. A pictorial representation of the physical orbits in the r, phi plane is also given.
Montgomery, H. E.↗
Performance of a 1.20 pressure ratio STOL fan stage at three rotor blade setting angles
A model of a short takeoff and landing (STOL) fan stage was testedin a single-stage compressor research facility. Surveys of the airflow conditions ahead of the rotor, between the rotor and stator, and behind the stator were made over the stable operating range of the stage. At the design speed of 213.3 meters per second and a weight flow of 31.2 kilograms per second, the stage pressure ratio of 1.15 was less than the design value of 1.2. The stage was tested with the rotor blades reset for more flow. Design pressure ratio was achieved and surpassed with the minus 5 deg and minus 7 deg resets, respectively. The stage efficiency was 0.88 for the minus 5 deg reset and 0.85 for the minus 7 deg reset.
Lewis, G. W., Jr.↗