Reversible ring counter employing cascaded single SCR stages Patent
Reversible ring counter using cascaded single silicon controlled rectifier stages
Libby, J. N.↗
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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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Position sensing device employing misaligned magnetic field generating and detecting apparatus Patent
Magnetic element position sensing device, using misaligned electromagnets
Strange, M. G.↗
Methods and apparatus employing vibratory energy for wrenching Patent
Ultrasonic wrench for applying vibratory energy to mechanical fasteners
Blaise, H. T.↗
Investigation to determine the feasibility of employing laser beam holography for the detection and characterization of bond defects in composite material structures Final report
Determining feasibility of using laser beam holography for detection and characterization of bond defects in composite material structures
Aas, H. G.↗
Pulse generating circuit employing switch means on ends of delay line for alternately charging and discharging same Patent
Pulse generating circuit for operation at very high duty cycles and repetition rates
Taddeo, F. V.↗
Exploratory plasmadynamic studies of vortex and coaxial flow geometries employing radiofrequency induction heating
Vortex and coaxial flow of argon and helium plasmas heated inductively, and strong magnetic field effects on turbulent plasma mixing, for gas core reactors
Keyes, J. J., Jr.↗
Analysis of a navigation concept employing a spinning radiating interferometer in geostationary orbit
Analysis of concept of spin-stabilized synchronous satellite carrying interferometer transmitting CW signals in L-band
Thomas, G. R.↗
Longitudinal aerodynamic characteristics at Mach 1.50 to 4.63 of a missile model employing various canards and a trailing edge flap control
Wind tunnel static longitudinal stability and control characteristics of cruciform delta winged missile with various horizontal canards and trailing-edge flap control between Mach 1.50 and 4.63
Trescot, C. D., Jr.↗
Microthrusters employing catalytically reacted N2-O2-H2 gas mixtures, Tridyne
Spacecraft attitude control microthrustors utilizing catalytically reactive gas mixtures during pulse mode and steady state operation
Barber, H. E.↗
Radiation field of spiral antennas employing multimode slow wave techniques
Multimode slow wave planar spiral antenna design and radiation field characteristics
Cubley, H. D.↗
Wind-Tunnel Investigation of the Drag and Lateral-Stability Characteristics of a 1/22-Scale Model of a Bomber Airplane Employing a Low-Aspect-Ratio Triangular Wing
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Phelps, E. R.↗
On the selection of an optimum design point for phase-coherent receivers employing band-pass limiters
An attempt to improve the performance of coherent carrier systems is described, involving optimizing the design point based upon a given practical optimizing criterion. The single-channel system is treated in detail, and a brief discussion is given on how to extend the technique to a two-channel system.
Simon, M. K.↗
The employment of weather satellite imagery in an effort to identify and locate the forest-tundra ecotone in Canada
Weather satellite imagery provides the only routinely available orbital imagery depicting the high latitudes. Although resolution is low on this imagery, it is believed that a major natural feature, notably linear in expression, should be mappable on it. The transition zone from forest to tundra, the ecotone, is such a feature. Locational correlation is herein established between a linear signature on the imagery and several ground truth positions of the ecotone in Canada.
Aldrich, S. A.↗
Development of Skylab experiment T020 employing a foot controlled maneuvering unit
A review of the plans and preparations is presented for Skylab experiment T020, entitled Foot-Controlled Maneuvering Unit (FCMU). The FCMU is an experimental system intended to explore the use of simple astronaut maneuvering devices in the zero-gravity environment of space. This review also includes discussions of the FCMU concept and experiment hardware systems, as well as supporting experiment definition and development research studies conducted with the aid of zero-gravity simulators.
Hewes, D. E.↗
Procedure for estimating stability and control parameters from flight test data by using maximum likelihood methods employing a real-time digital system
A maximum likelihood parameter estimation procedure and program were developed for the extraction of the stability and control derivatives of aircraft from flight test data. Nonlinear six-degree-of-freedom equations describing aircraft dynamics were used to derive sensitivity equations for quasilinearization. The maximum likelihood function with quasilinearization was used to derive the parameter change equations, the covariance matrices for the parameters and measurement noise, and the performance index function. The maximum likelihood estimator was mechanized into an iterative estimation procedure utilizing a real time digital computer and graphic display system. This program was developed for 8 measured state variables and 40 parameters. Test cases were conducted with simulated data for validation of the estimation procedure and program. The program was applied to a V/STOL tilt wing aircraft, a military fighter airplane, and a light single engine airplane. The particular nonlinear equations of motion, derivation of the sensitivity equations, addition of accelerations into the algorithm, operational features of the real time digital system, and test cases are described.
Grove, R. D.↗
Aircraft systems design studies employing advanced transport technologies
System and design integration studies are presented to define and assess the application of the advanced technology most likely to result in a superior next generation, high subsonic/sonic conventional takeoff and landing transport aircraft system. It is concluded that the new technologies can be directed toward the achievement of improved economy and performance. These benefits may be used to compensate for the penalties associated with reduced noise requirements anticipated to make future aircraft ecologically acceptable.
Downie, B.↗
A magnetically focused image tube employing an opaque photocathode
Image converter has been developed which uses opaque photocathode for improved efficiency. Device is easier to fabricate than previous semi-transparent photocathode converters and uses compounds from Groups 3-5 that are responsive to wave-lengths between ultraviolet (approximately 100 nm) and near infrared region (approximately 1000 nm).
Johnson, C. B.↗
A new algorithm for finding survival coefficients employed in reliability equations
Product reliabilities are predicted from past failure rates and reasonable estimate of future failure rates. Algorithm is used to calculate probability that product will function correctly. Algorithm sums the probabilities of each survival pattern and number of permutations for that pattern, over all possible ways in which product can survive.
Bouricius, W. G.↗