Instability in fully developed turbulence
Three dimensional turbulent flow, using direct interaction approximation for growth and propagation of point-to-point velocity field deviations energy spectrum
Kraichnan, R. H.↗
SEARCH · Engineering Papers
Results for “deviated”
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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On the correction of coefficient quantization errors in hybrid control systems
Time response deviation correction in hybrid computer control systems with digital feedback elements containing quantized coefficients
Chenoweth, D. L.↗
A continued fraction generator for smooth pulse sequences
Digital circuit produces rational output pulse rate at fraction of continuous input pulse rate. Output pulses have average rate with least possible deviation from absolute correct time spacing. Circuit uses include frequency synthesizing, fraction generation, and approximation of irrational sequences.
Cohn, M.↗
Comparison of the SAO Star catalog with Cape catalogues from minus 64 deg to minus 90 deg
Star position and proper motions in south celestial pole region and source dependent systematic deviations in Smithsonian Astrophysical Observatory data
Haramundanis, K.↗
Apollo window deformation and ray trace analyses Technical report, Jun. 1968 - Aug. 1970
Line-of-sight deviations and ray trace analyses of Apollo side window for optical experiments
Kelley, D. M.↗
Study of the effect of spacecraft window configuration on lines of sight
Pressure deformations of spacecraft windows and angular line-of-sight deviations of light rays from these windows causing errors in celestial navigation sightings - graphs
Kelley, D. M.↗
Strain Rate Sensitive Constitutive Equations
Stain rate sensitive constitutive equations using yield criterion which incorporates second and third invariants of stress deviator
Nelson, C. E.↗
Directional behavior of thermal emission from a rough lunar surface
Directional thermal emission from rough lunar surface as function of crater frequency, aspect ratio and solar deviation angle, comparing to Lambertian behavior
Adorjan, A. S.↗
Atmospheric turbulence on Venus - Venera 4, 5, 6, and Mariner 5 estimates
Venus atmospheric turbulence from Venera 4, 5, 6 and Mariner 5 observations, discussing scaling laws and normalized signal-amplitude standard deviation
De Wolf, D. A.↗
Energy losses which are not measured by ionization spectrometers
Mean and standard deviation of fraction of total primary cosmic ray energy losses not measurable by ionization spectrometers
Jones, W. V.↗
Comparison of catalyst activity
Reactions of highly active catalysts are compared by allowing temperature of catalyst bed, initially at 77 K, to increase slowly; marked deviation in smooth warming curve denotes temperature at which detectable reaction occurs. The lower the temperature at which reaction commences, the more active the catalyst.
Jennings, T. J.↗
Interferometric rotation sensor
Sensor generates interference fringes varying in number (horizontally and vertically) as a function of the total angular deviation relative to the line-of-sight axis. Device eliminates errors from zero or null shift due to lack of electrical circuitry stability.
Walsh, T. M.↗
Growth Kinetics of the S Sub H Center on Magnesium Oxide Using Electron Paramagnetic Resonance
Electron paramagnetic resonance spectroscopy was used to study the growth of S sub H centers on magnesium oxide powder which had hydrogen adsorbed on its surface. The centers were produced by ultraviolet radiation. The effects of both radiation intensity and hydrogen pressure were also studied. At constant hydrogen pressure and radiation dose, the initial S sub H center growth rate was found to be zero order. Beyond the initial region the growth rate deviated from zero order and finally approached saturation. The results are interpreted in terms of a model which assumes that the S sub H center is a hydrogen atom associated with a surface vacancy. Saturation appears to result from a limited supply of surface vacancies.
Jayne, J. P.↗
Design and performance evaluation of a wideband FM spread-spectrum multiple-access system
The system described performs the tracking and communications functions of a tracking and data relay satellite system (TDRS). The spread-spectrum signal format is achieved through wide deviation FM by a sinusoidal subcarrier unique to each multiple-access user. A compound phase-locked loop tracks carrier and subcarrier and demodulates data and ranging signals. Design parameters of user and ground terminals for TDRS are given. Acquisition procedures are described. Performance analyses are presented including the effects of noise, RFI, multipath and other users.
Wachsman, R. H.↗
Spacecraft orbit/earth scan derivations, associated APL program, and application to IMP-6
The derivation of a time shared, remote site, demand processed computer program is discussed. The computer program analyzes the effects of selected orbit, attitude, and spacecraft parameters on earth sensor detections of earth. For prelaunch analysis, the program may be used to simulate effects in nominal parameters which are used in preparing attitude data processing programs. After launch, comparison of results from a simulation and from satellite data will produce deviations helpful in isolating problems.
Smith, G. A.↗
Angular momentum desaturation for Skylab using gravity gradient torques
An angular momentum desaturation method for momentum exchange devices of orbiting spacecraft is described. The specific application of the method is to the Skylab which contains three double-gimbaled control moment gyros for precise attitude control and maneuvering. It is assumed that the attitude reference is inertially fixed and that two of the vehicle principal moments of inertia are much larger than the third. Gravity gradient torques and resultant angular momentum accumulation are developed for small deviations from the reference. The assumed moment-of-inertia distribution allows desaturation about all axes with only two attitude angles each for the two axes with large moments of inertia. The necessary desaturation maneuvers can be decoupled for a special set of orbital coordinates. All maneuvers are made during the night portion of the orbit, and the percentage utilized for desaturation is selectable. Expressions for the attitude angle commands are developed assuming infinite vehicle rates. The effect of finite rates introduces an efficiency into the desaturation. Expressions for this efficiency are developed and means for compensation are treated. Arbitrary misalignments between geometric vehicle axes and principal moment-of-inertia axes are permissible. An angle bias about the sun line minimizes the angular momentum accumulation about the sun line projection into the orbital plane. Adaptive desaturation maneuver limiting consistent with the available maneuver momentum is included.
Kennel, H. F.↗
A simple spectrophotometric method for determination of zirconium or hafnium in selected molybdenum-base alloys
A simple analytical procedure is described for accurately and precisely determining the zirconium or hafnium content of molybdenum-base alloys. The procedure is based on the reaction of the reagent Arsenazo III with zirconium or hafnium in strong hydrochloric acid solution. The colored complexes of zirconium or hafnium are formed in the presence of molybdenum. Titanium or rhenium in the alloy have no adverse effect on the zirconium or hafnium complex at the following levels in the selected aliquot: Mo, 10 mg; Re, 10 mg; Ti, 1 mg. The spectrophotometric measurement of the zirconium or hafnium complex is accomplished without prior separation with a relative standard deviation of 1.3 to 2.7 percent.
Dupraw, W. A.↗
The reduction of the National Aeronautics and Space Administration plates at the New Mexico University
A method of reducing GEOS satellite plates is described. The catalog positions of stars, whose images were measured, are updated to the time of the photographic observation. The plate constants are used to compute the positions of the seven (or fewer) flashing light images which were measured. There are corrected for refraction, parallax, and radial and decentering lens distortions. With sidereally tracking cameras, the exterior orientation is further corrected to the time of the particular flash, and the change of refraction with time is allowed for. First and second differences and standard deviations and covariances for the flashing light images are developed as a measure of accuracy.
Haas, W. H.↗