On the distribution of major-axes of long- period comets.
Major axes distribution of long period comets, stressing number distribution and binding energy
Lyttleton, R. A.↗
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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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Technique for predicting temperature distribution in gases
Simple algebraic equations enable calculation of the temperature distribution throughout a heat generating, radiation gas. They apply over the entire range of opacities, for any heat flux, for a temperature dependent absorption coefficient, and for a non-uniform distribution of volumetric heat sources.
Kascak, A.↗
Ion, electron, and neutral temperatures derived from ion composition distribution.
Ion, electron and neutral temperatures from ion composition distribution, assuming no change in vertical distribution within horizontal distance between upleg and downleg measurements
Narasinga Rao, B. C.↗
Electron distribution function in a slightly ionized moving gas.
Lorentz gas approximation to Boltzmann collision operator generalized for heavy molecule nonMaxwellian gas distribution function, obtaining equilibrium distribution applicable to ionized gas
Mintzer, D.↗
Distribution of redshifts of quasars.
Quasars red shifts distribution interpreted as due to cosmological and gravitational red shifts distribution, noting analysis error
Patterson, T. N. L.↗
The distributed-lumped-active network - Its application to filtering problems.
Distributed RC networks combined with lumped passive and active elements to produce distributed-lumped-active /DLA/ networks for filter requirements
Huelsman, L. P.↗
A geometrical approach to the special stable distributions
Convolution formulas for Cauchy and standard normal random variable distributions derived from geometry of circular symmetric distribution on plane
Savage, L. J.↗
Effect of non-uniform emitter current distribution on power transistor stability
Nonuniform emitter current distribution effect on power transistor thermal stability, discussing temperature distribution effects
Lee, R. E.↗
Multiloop distributed RC active networks
Distributed RC active two-port network and voltage amplifier provides advantage over lumped elements in that second-order bandpass function is obtained with single distributed passive element. Incorporating positive and negative feedback loops provides improvement in Q, sensitivity, and gain-Q sensitivity product compared to single-loop networks.
Kerwin, W. J.↗
Can the lumpy distribution of galaxies be reconciled with the smooth X-ray background
X ray background angular structure comparison with optical galaxies spatial distribution, ruling out universe models with sources following cosmological mass distribution
Burbidge, G. R.↗
Design criteria for selection of aircraft electric power generation and distribution systems
STOL aircraft electric power variable frequency generation and high voltage DC distribution with secondary square wave AC distribution
Lee, C. H.↗
Vibrational population distributions in nonequilibrium nozzle expansion flows
Experimental measurements and theoretical calculations of the vibrational population distribution in nonequilibrium nozzle expansion flows of gas mixtures are reported. These studies were directed toward determining whether vibrational energy exchange pumping could lead to laser action on the vibrational bands of a diatomic molecule. Three different types of experiments were conducted. These showed (1) that vibrational energy was preferentially transferred from N2 to CO in supersonic nozzle flows containing these gases; (2) that under some conditions this vibrational energy exchange pumping mechanism created population inversions in the vibrational levels of CO; and (3) that at large expansion ratios the magnitude of these population inversions was sufficient to sustain lasing in the nozzle. A theoretical model was developed to calculate vibrational state population distributions in gas dynamic expansions of a mixture of diatomic gases. Although only isothermal calculations have been completed, these data indicate that population inversions are predicted for conditions similar to those obtained in the nozzle expansion flows.
Watt, W. S.↗
Simulation of flight maneuver-load distributions by utilizing stationary, non-Gaussian random load histories
Random numbers were generated with the aid of a digital computer and transformed such that the probability density function of a discrete random load history composed of these random numbers had one of the following non-Gaussian distributions: Poisson, binomial, log-normal, Weibull, and exponential. The resulting random load histories were analyzed to determine their peak statistics and were compared with cumulative peak maneuver-load distributions for fighter and transport aircraft in flight.
Leybold, H. A.↗
Use of the negative binomial-truncated Poisson distribution in thunderstorm prediction
A probability model is presented for the distribution of thunderstorms over a small area given that thunderstorm events (1 or more thunderstorms) are occurring over a larger area. The model incorporates the negative binomial and truncated Poisson distributions. Probability tables for Cape Kennedy for spring, summer, and fall months and seasons are presented. The computer program used to compute these probabilities is appended.
Cohen, A. C.↗
Density and flux distributions in the lunar atmosphere due to point and line sources
Apart from the globally distributed ambient gases in the lunar atmosphere, localized gas sources, such as volcanos, may have a measurable effect on the process of shaping the lunar atmosphere. Analytic solutions were obtained for the spatial distributions of neutral gas densities and fluxes due to point and line sources at the lunar surface. Both density and flux profiles are strong functions of the distance from the source to the point of observation. The study also reveals that: (1) The location of the source may be identified from the density and flux profiles. (2) If the gas species is known, the temperature of the gas may be determined from the density gradient at a distance of several scale heights from the source. (3) The strength of the gas source may be determined by the magnitudes of density and flux.
Yeh, T. T. J.↗
Generation of Finite Life Distributional Goodman Diagrams for Reliability Prediction
The methodology of developing finite life distributional Goodman diagrams and surfaces is described for presenting allowable combinations of alternating stress and mean stress to the design engineer. The combined stress condition is that of an alternating bending stress and a constant shear stress. The finite life Goodman diagrams and surfaces are created from strength distributions developed at various ratios of alternating to mean stress at particular cycle life values. The conclusions indicate that the Von Mises-Hencky ellipse, for cycle life values above 1000 cycles, is an adequate model of the finite life Goodman diagram. In addition, suggestions are made which reduce the number of experimental data points required in a fatigue data acquisition program.
Kececioglu, D.↗
Optimal shield mass distribution for space radiation protection
Computational methods have been developed and successfully used for determining the optimum distribution of space radiation shielding on geometrically complex space vehicles. These methods have been incorporated in computer program SWORD for dose evaluation in complex geometry, and iteratively calculating the optimum distribution for (minimum) shield mass satisfying multiple acute and protected dose constraints associated with each of several body organs.
Billings, M. P.↗
The determination and optimization of (rutile) pigment particle size distributions
A light scattering particle size test which can be used with materials having a broad particle size distribution is described. This test is useful for pigments. The relation between the particle size distribution of a rutile pigment and its optical performance in a gray tint test at low pigment concentration is calculated and compared with experimental data.
Richards, L. W.↗