A random multiple access technique for satellite data collection
Random multiple access technique for satellite data collection, taking advantage of frequency instability associated with oscillator circuits
Arndt, A. E.↗
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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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Comparison of several demand assignment multiple access/modulation techniques for satellite communications
Comparison of demand assignment multiple access/ modulation techniques for satellite communication using high quality telephone channels
Jones, M. E.↗
The doubling method applied to multiple scattering of polarized light
Doubling method application to multiple scattering of polarized light, studying Venus visible disk reflection of sunlight
Hansen, J. E.↗
Multiple backscattering and depolarization from water clouds for a pulsed lidar system
Linearly polarized lidar light scattering in spherically symmetrical uniformly distributed cloud water drops, investigating multiple backscattering effects on depolarization
Liou, K.↗
Time-dependent multiple backscattering
Time dependent multiple backscattering of pulsed light for linearly polarized incident radiation
Liou, K.↗
Simultaneous multiple wavelength laser radar measurements of the lower atmosphere
Lower atmospheric multiple wavelength laser radar data compared to clear atmosphere model and radiosonde measurements, discussing mixing layer location
Mccormick, M. P.↗
Multiple crossings of the earth's bow shock at large geocentric distances
Earth bow shock multiple crossings identification by magnetic field experiment onboard Pioneer 8 at geocentric distances
Bavassano, B.↗
Multiple pulsar ejection in supernova events
Multiple pulsar ejection in supernova core collapse and neutron star formation energy loss
Michel, F. C.↗
Observing behavior in squirrel monkeys under a multiple schedule of reinforcement availability
Observing behavior in squirrel monkeys under multiple schedule of reinforcement availability
Clark, F. C.↗
Multiple scattering theory of radiative transfer in the light of singular modes
Multiple scattering theory of radiative transfer boundary value problems, showing Neumann intensity expansion coefficients relation to singular normal modes
Kanal, M.↗
Thermal control for storage of cryogenic propellants in a multiple-tank system: A concept
Development of system for storing cryogenic propellants in multiple tank configuration is discussed. System uses single loop and closed loop features. Liquid nitrogen and Freon-14 are used as refrigerants. Diagram of equipment to show components and operation is provided.
Stone, G. R.↗
Spectral analysis of multiple time series
Application of spectral analysis for mathematically determining relationship of random vibrations in structures and concurrent events in electric circuits, physiology, economics, and seismograms is discussed. Computer program for performing spectral analysis of multiple time series is described.
Dubman, M. R.↗
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.↗
A model for multiple-drop-impact erosion of brittle solids
A statistical model for the multiple-drop-impact erosion of brittle solids was developed. An equation for calculating the rate of erosion is given. The development is not complete since two quantities that are needed to calculate the rate of erosion with use of the equation must be assessed from experimental data. A partial test of the equation shows that it gives results that are in good agreement with experimental observation.
Engel, O. G.↗
The Determination of the Geometries of Multiple-Element Airfoils Optimized for Maximum Lift Coefficient
Optimum airfoils in the sense of maximum lift coefficient are obtained by a newly developed method. The maximum lift coefficient is achieved by requiring that the turbulent skin friction be zero in the pressure rise region on the upper surface. Under this constraint, the pressure distribution is optimized. The optimum pressure distribution consists of a uniform stagnation pressure on the lower surface, a uniform minimum pressure on the upper surface immediately downstream of the front stagnation point followed by a Stratford zero skin friction pressure rise. When multiple-element airfoils are under consideration, this optimum pressure distribution appears on every element. The parameters used to specify the pressure distribution on each element are the Reynolds number and the normalized trailing edge velocity. The newly developed method of design computes the velocity distribution on a given airfoil and modifies the airfoil contour in a systematic manner until the desired velocity distribution is achieved. There are no limitations on how many elements the airfoil to be designed can have.
Chen, A. W.↗
On the method of Ermakov and Zolotukhin for multiple integration
By introducing the idea of pseudo-implementation, a practical assessment of the method for multiple integration is made. The performance of the method is found to be unimpressive in comparison with a recent regression method.
Cranley, R.↗
A multiple-impulse function for orbital transfer and its derivatives
A multiple-impulse function is represented as a sequence of single-impulse functions. The single-impulse transfer which yields the velocity change required to transfer from a specified initial orbit to a partially specified final orbit is developed. Analytic derivatives of the function are obtained for use in optimization techniques. A four-impulse transfer is outlined. The analytic derivatives may allow more efficient optimization than numerical derivatives do.
Kibler, J. F.↗
The effect of multiple encounters on short period comet orbits
The observed orbital elements of short period comets are found to be consistent with the hypothesis of derivation from long period comets as long as two assumptions are made. First, the distribution of short period comets has been randomized by multiple encounters with Jupiter and second, the short period comets have lower velocities of encounter with Jupiter than is generally expected. Some 16% of the observed short period comets have lower encounter velocities than is allowed mathematically using Laplace's method. This may be due to double encounter processes with Jupiter and Saturn, or as a result of prolonged encounters. The distribution of unobservable short period comets can be inferred in part from the observed comets. Many have orbits between Jupiter and Saturn with somewhat higher inclinations than those with perihelions near the earth. Debris from those comets may form the major component of the zodiacal dust.
Lowrey, B. E.↗