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May 6, 2010
05/10
by
Eviator, A.; Lenchek, A. M.; Singer, S. F
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Density distribution in ion-exosphere of nonrotating planet
Topics: DENSITY DISTRIBUTION, EXOSPHERE, PLANETS, DENSITY DISTRIBUTION, EXOSPHERE, PLANET
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315
May 27, 2011
05/11
by
Ware, George M
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eye 315
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An investigation of the low-subsonic-speed static longitudinal stability and control characteristics of a model of a manned reentry-vehicle configuration capable of high-drag reentry and glide landing has been a made in the Langley free-flight tunnel. The model had a modified 63 deg delta plan-form wing with a fuselage on the upper surface. This configuration had wingtip panels designed to fold up 90 deg for the high-drag reentry phase of the flight and to extend horizontally for the glide...
Topics: EXOSPHERE, DENSITY DISTRIBUTION, OPIK THEORY, DEPTH, THEOREMS
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503
Jun 20, 2010
06/10
by
Hayes, C. D
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eye 503
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Equations for power spectral density function, and for root mean square of power spectral density function
Topics: DENSITY DISTRIBUTION, FUNCTIONAL ANALYSIS, MEAN SQUARE VALUES, POWER SPECTRA, SPECTRA, SPECTRUM...
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312
Jun 17, 2010
06/10
by
Haug, U
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eye 312
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Frequency distribution of orbital elements in interplanetary dust particles - model for representing density distribution of dust based on zodiacal light observations
Topics: DENSITY DISTRIBUTION, INTERPLANETARY DUST, ORBITAL ELEMENT, ZODIACAL LIGHT, DUST, FREQUENCY...
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331
May 6, 2010
05/10
by
Langebartel, R. G
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eye 331
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Statistical celestial mechanics - density distribution function
Topics: CELESTIAL MECHANICS, DENSITY DISTRIBUTION, DISTRIBUTION FUNCTION, STATISTICAL MECHANICS, DENSITY...
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203
Jul 11, 2010
07/10
by
KAISER, H
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eye 203
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SPECTROCHEMICAL CALIBRATION CURVES ARE GENERALLY CURVED IF THE INTENSITY OF THE SPECTRUM BACKGROUND IS NOT TAKEN INTO ACCOUNT. IF THE BACKGROUND INTENSITY IS SUBTRACTED, A STRAIGHT LINE IS USUALLY OBTAINED. THE EQUATIONS FOR THE (TRUE) STRAIGHT LINE AND FOR THE UNCORRECTED CALIBRATION CURVE ARE SET UP. EACH MAY BE CALCULATED FROM THE OTHER. IN LIMITED CONCENTRATION RANGES, THE CALIBRATION CURVE MAY BE APPROXIMATED BY A STRAIGHT LINE. THE EQUATIONS FOR THESE SUBSTITUTE STRAIGHT LINES ARE...
Topics: CHEMICAL REACTIONS, ECOLOGY, MICROORGANISMS, SOIL SCIENCE, AUTORADIOGRAPHY, BIOASSAY, CULTURE...
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334
May 31, 2011
05/11
by
Abbaschian, Reza; deGroh, Henry C., III; Leonardi, E.; deVahlDavis, Graham; Coriell, Sam; Cambon, Gerar
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eye 334
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This reports on the MEPHISTO-4 experiment on the Space Shuttle Columbia, STS-87, November 19-December 5, 1997. Involved were NASA; the University of Florida at Gainesville; groups from France that developed and built the furnace; the National Institute of Standards and Technology; The University of New South Wales, Australia; and Purdue University. This was a solidification study in which three long rods of Bismuth- 1 at. Tin were directionally solidified. The goals were to solidify in an...
Topics: EARTH IONOSPHERE, IONOSPHERIC STORMS, THERMOSPHERE, IONOSPHERIC ELECTRON DENSITY, DENSITY...
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538
May 22, 2011
05/11
by
Cerbus, Clifford A.; Carlin, Patrick S
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eye 538
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The Air Force Space and Missile Systems Center and Wright Laboratory Materials Directorate (WL/ML) have sponsored and effort to effort to reformulate and qualify Illinois Institute of Technology Research Institute (IITRI) spacecraft thermal control coatings. S13G/LO-1, Z93, and YB-71 coatings were reformulated because the potassium silicate binder, Sylvania PS-7, used in the coatings is no longer manufactured. Coatings utilizing the binder's replacement candidate, Kasil 2130, manufactured by...
Topics: PHONONS, POLARITONS, POPULATIONS, QUANTUM OPTICS, SOLIDS, SQUEEZED STATES (QUANTUM THEORY), CRYSTAL...
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242
Jul 11, 2010
07/10
by
Weinstein, M. S
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eye 242
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A test program was conducted with duPont duplicating film type SR 112 and SCOLOR developer and Kodak duplicating film types 2430, 2422, and FE 2628 (SO-467) and MX-641 developer to determine sensitometric and image quality characteristics of these materials when used with a fultron spray processor. The test results show that the SCOLOR developer foams excessively in the fultron processor when used with or without the addition of an antifoaming agent. The Kodak type FE 2628 film with MX-641...
Topics: DENSITY DISTRIBUTION, TEMPERATURE DISTRIBUTION, THERMOSPHERE, VELOCITY DISTRIBUTION, VENUS...
In this paper the magnetic flux density distribution of a Halbach permanent magnet array for magnetically levitated planar motor is modelled analytically. The analytical first order harmonic model is derived initially from Fourier harmonic waves of magnetic field. Then the real magnetic field of a Halbach permanent magnet array is measured on a Teslameter‐centred measurement platform and the measured results are analysed. Next, the key parameter of analytical model is fitted and the...
Topics: Halbach Permanent Magnet Array, The First Order Harmonic Model, Magnetic Flux Density Distribution,...
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382
Jun 2, 2011
06/11
by
Turner, T. J.; Kraemer, S. B
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eye 382
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We present results from a 20 ksec XMM-Newton observation of Mrk 231. EPIC spectral data reveal strong line emission due to Fe K alpha, which has rarely been detected in this class, as BAL QSOs are very faint in the X-ray band. The line energy is consistent with an origin in neutral Fe. The width of the line is equivalent to a velocity dispersion approximately 18,000 kilometers per second and thus the line may be attributed to transmission and/or reflection from a distribution of emitting...
Topics: CALIBRATING, VISCOSITY, VISCOMETERS, TRANSFER FUNCTIONS, CARBON DIOXIDE, OSCILLATIONS, CRITICAL...
The azimuthally averaged neutral hydrogen (HI) distribution, and the total gas density distribution derived from HI and CO observations (N sub H2 = 2.8 x 10(exp 20) I sub CO) as a function of radius in several nearby, early-type disks are examined.
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, DISK GALAXIES, GAS DENSITY, NEUTRAL...
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187
Jul 23, 2010
07/10
by
Cucinotta, Francis A.; Norbury, John W.; Khandelwal, Govind S.; Townsend, Lawrence W
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An abrasion-ablation T-matrix formulation is applied to the calculation of double differential-cross sections in projectile fragmentation of 2.1 GeV/nucleon O-16 on Be-9 and 86 MeV/nucleon C-12 on C-12 and Ag-108. An exponential parameterization of the ablation T-matrix is used and the total width of the intermediate states is taken as a parameter. Fitted values of the total width to experimental results are used to predict the lifetime of the ablation stage and indicate a decay time on the...
Topics: EARTH SURFACE, TARGETS, METEORITE CRATERS, METEORITIC MICROSTRUCTURES, ROCKS, DENSITY DISTRIBUTION,...
Crater counts on Rhea were completed, to be compared and combined with independent counts by Steve Squyres; the material is now being integrated into a study of cratering on Rhea and other Saturn satellites by Squyres, Lissauer, and Hartmann. Special attention is being paid to lighting and other effects on the apparent changes in crater density from one region to another. An earlier proposal by the author on crater density was further tested. Brief preliminary results are given.
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, PROJECTILE CRATERING, RHEA (ASTRONOMY),...
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The design and operations guidelines and requirements developed in the study of space base nuclear system safety are presented. Guidelines and requirements are presented for the space base subsystems, nuclear hardware (reactor, isotope sources, dynamic generator equipment), experiments, interfacing vehicles, ground support systems, range safety and facilities. Cross indices and references are provided which relate guidelines to each other, and to substantiating data in other volumes. The...
Topics: DENSITY DISTRIBUTION, GRAVITATIONAL FIELDS, LUNAR GRAVITATION, MAGNETIC EQUATOR, ASTROPHYSICS,...
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259
Jul 11, 2010
07/10
by
Brody, P. S
texts
eye 259
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The short-circuit currents and photo-emfs were measured for various ceramics including barium titanate, lead metaniobate, and lead titanate. It is suggested that the emfs and currents arise from the presence of photoconductor-insulator sandwiches in the presence of space-charge-produced internal fields. Results are in agreement with the proposed theory and indicate that the ferroelectric ceramics are not only producers of high-voltage photoelectricity but a photo-battery, the polarity and...
Topics: DIELECTRICS, ENERGY DISTRIBUTION, FILMS, ION DENSITY (CONCENTRATION), ION TRAPS (INSTRUMENTATION),...
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243
May 31, 2011
05/11
by
Reid, Mark J
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eye 243
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Our program, funded by a NASA/SARA 3-yr grant, is designed to measure distances directly with accuracies of 5% to three anchor points in the Local Universe. We are attacking this problem on three fronts, using Very Long Baseline Interferometry (VLBI) observations of NGC 4258, M 33, and Sgr A. We plan to provide distance estimates, with a minimum of systematic uncertainty, that can be used to re-calibrate several 'standard candles,' such as Cepheid and RR Lyrae variables. This will place the...
Topics: STRATIFIED FLOW, TURBULENT FLOW, SHEAR FLOW, INTERNAL WAVES, GRAVITY WAVES, PHASE SHIFT, DENSITY...
The results of 21 rocket flights of Arcas optical ozonesondes were combined to produce estimates of the mean ozone distribution and its variability; these estimates apply to a broad range of latitudes. The flights were launched from sites near the equator to 58 S and to 64 N, in the years from 1965 to 1971. The local-noon mean ozone densities in molecules/cubic centimeter are 7.0 to the 10th power at 50 km, 6.7 x 10 to the 11th power at 40 km, 3.1 x 10 to the 12th power at 30 km, and 3.1 x 10...
Topics: NASA Technical Reports Server (NTRS), ANNUAL VARIATIONS, DENSITY DISTRIBUTION, OZONE, ROCKET...
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148
May 30, 2011
05/11
by
Sjoegreen, B.; Yee, H. C
texts
eye 148
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The objective of this paper is to evaluate the performance of a newly developed low dissipative sixth-order spatial and fourth-order temporal scheme for viscous reactive flows interacting with shock waves that contain fine scale flow structures. The accuracy and efficiency of the scheme, and to what degree the scheme can capture the correct physical wave speeds of stiff reactive flows will be included.
Topics: AEROELASTICITY, DISCRETE FUNCTIONS, DECOMPOSITION, CLASSIFICATIONS, AEROSERVOELASTICITY, WAVELET...
This is a study to assist in the understanding of earth near surface structure. Higher order moments are used to detect the density distribution as well as to seek patterns found in geological structures. It is shown how higher order moments at points outside a mass structure are determined as well as how to recover the mass distribution from the higher order moments. It is interesting to note that the first moment at a point P outside the mass structure, V(sub O)(P), is the entire mass and the...
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, EARTH SURFACE, MASS DISTRIBUTION,...
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170
May 27, 2011
05/11
by
Collatz, G. James; Bounoua, Lahouari; Sellers, Piers; Los, Sietse; Randall, David; Berry, Joseph; Tucker, Compton J
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Transpiration, a major component of total evaporation from vegetated surfaces, is an unavoidable consequence of photosynthetic carbon fixation. Because of limiting soil moisture and competition for solar radiation plants invest most of their fixed carbon into structural and hydraulic functions (roots and stems) and solar radiation absorption (leaves). These investments permit individuals to overshadow competitors and provide for transport of water from the soil to the leaves where...
Topics: PLASMAS (PHYSICS), BOUNDARY LAYERS, CONVECTION, DENSITY DISTRIBUTION, PLASMA DENSITY, DYNAMIC...
The mutual diffusion of two reacting gases is examined which takes place in a bath of inert gas atoms. Solutions are obtained between concentric spheres, each sphere acting as a source for one of the reactants. The calculational model is used to illustrate severe number density gradients observed in absorption experiments with alkali vapor. Severe gradients result when sq root k/D R is approximately 5 where k, D, and R are respectively the second order rate constant, the multicomponent...
Topics: NASA Technical Reports Server (NTRS), ALKALI METALS, CHEMICAL REACTIONS, METAL VAPORS, DENSITY...
A beta distribution is specified by range parameters a b, and two shape parameters alpha and beta 0. The computer program presented calculates any desired probability and/or fractile point for specified values of a, b, alpha, and beta. This program additionally computes gamma function values for integer and noninteger arguments.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, PROBABILITY DISTRIBUTION FUNCTIONS,...
A numerical analysis of zonal geopotential coefficients and the bounds on the tesseral coefficients is presented. Modifications designed to incorporate data on the earth's density distribution are developed. The nature of the modifications and the application are discussed.
Topics: NASA Technical Reports Server (NTRS), EARTH PLANETARY STRUCTURE, GEOPOTENTIAL, GRAVITATIONAL...
Because of the diverging susceptibility delta rho/delta Tau near the liquid-vapor critical point, temperature gradients must be kept small to maintain adequate sample homogeneity. In our Science Requirements Document we paid particular attention to radial density gradients caused by equilibration of the xenon sample. Axial density gradients were addressed through the requirement that the cell's copper wall have a gradient less than 22 microK/m. This report re-examines the cell wall's...
Topics: NASA Technical Reports Server (NTRS), TEMPERATURE DISTRIBUTION, CRITICAL POINT, VISCOSITY, XENON,...
An empirical model of the global atomic oxygen and helium distributions in the thermosphere is developed in a magnetic coordinate system and compared to similar models which are expanded in geographic coordinates. The advantage of using magnetic coordinates is that fewer terms are needed to make predictions which are nearly identical to those which would be obtained from a geographic model with longitudinal and universal time corrections. Magnetic coordinates are more directly related to the...
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, GEOMAGNETISM, MAGNETIC EQUATOR, OXYGEN,...
The present paper argues for using the information theory approach as an inference technique in solid earth geophysics. A spherically symmetric density distribution is derived as an example of the method. A simple model of the earth plus knowledge of its mass and moment of inertia leads to a density distribution. Future directions for the information theory approach in solid earth geophysics as well as its strengths and weaknesses are discussed.
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, GEOPHYSICS, INFORMATION THEORY, EARTH...
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216
May 21, 2011
05/11
by
Bokhari, Shahid H
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eye 216
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Parametric Binary Dissection (PBD) is a new algorithm that can be used for partitioning graphs embedded in 2- or 3-dimensional space. It partitions explicitly on the basis of nodes (lambda)x(edges cut), where lambda is the ratio of time to communicate over an edge to the time to compute at a node. The new algorithm is faster than the original binary dissection algorithm and attempts to obtain better partitions than the older algorithm, which only takes nodes into account. The performance of...
Topics: MICROWAVE SCATTERING, PROBABILITY THEORY, SCATTEROMETERS, OCEAN SURFACE, RAIN, WIND MEASUREMENT,...
The well known linear relation between density and peculiar velocity distributions is a powerful tool for studying the large-scale structure in the Universe. Potentially it can test the gravitational instability theory and measure Omega. At present it is used in both ways: the velocity is reconstructed, provided the density is given, and vice versa. Reconstructing the density from the velocity field usually makes use of the Zel'dovich approximation. However, the standard linear approximation in...
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, GRAVITATIONAL EFFECTS, LAGRANGIAN...
A three dimensional numerical interpolation scheme which resolves frontal gradients with high fidelity was developed and is being applied to the study of atmospheric upper baroclinic zones.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC PRESSURE, BAROCLINITY, DENSITY DISTRIBUTION,...
Path Integral Monte Carlo was used to calculate the Bose-Einstein condensate fraction at the surface of a helium film at T = 0:77 K, as a function of density. Moving from the center of the slab to the surface, the condensate fraction was found to initially increase with decreasing density to a maximum value of 0.9, before decreasing. Long wavelength density correlations were observed in the static structure factor at the surface of the slab. A surface dispersion relation was calculated from...
Topics: NASA Technical Reports Server (NTRS), CONDENSATES, HELIUM ISOTOPES, COMPUTATION, MONTE CARLO...
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319
Jul 21, 2010
07/10
by
Alaghband, G.; Jordan, H. F
texts
eye 319
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Generation of the maximal compatibles of pivot elements for a class of small sparse matrices is studied. The algorithm involves a binary tree search and has a complexity exponential in the order of the matrix. Different strategies for selection of a set of compatible pivots based on the Markowitz criterion are investigated. The competing issues of parallelism and fill-in generation are studied and results are provided. A technque for obtaining an ordered compatible set directly from the ordered...
Topics: BIT ERROR RATE, PULSE MODULATION, DATA RECORDING, DIGITAL TECHNIQUES, ERROR DETECTION CODES, PULSE...
A development was the time linearization of the density function. This linearization reduces the solution process from solving just a single equation. Two sample cases were computed. First, a one dimensional traveling shock wave was computed and compared with the analytic solution. Second, a two dimensional case was calculated for a flow field which resulted from a thickening and subsequently, thinning airfoil. The resulting flow field, which included a traveling shock wave, was compared to the...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, TRANSONIC FLOW, UNSTEADY FLOW, DENSITY...
The purpose of this proposed research is to improve our basic understanding of the causes of ionospheric storm behavior in the midlatitude F region ionosphere. This objective will be achieved by detailed comparisons between ground based measurements of the peak electron density (N(sub m)F(sub 2)), Atmosphere Explorer satellite measurements of ion and neutral composition, and output from the Field Line Interhemispheric Plasma (FLIP) model. The primary result will be a better understanding of...
Topics: NASA Technical Reports Server (NTRS), EARTH IONOSPHERE, IONOSPHERIC STORMS, THERMOSPHERE,...
A technique was developed for obtaining tone separations from black and white photographic materials. Agfacontour film and photographic derivatives are utilized to improve the density discrimination and decrease the density range from 0.45 to 0.08 units. This increase in capability extends the usefulness of tone separations to a wider range of subject matter and problem areas.
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, PHOTOGRAPHIC FILM, VISUAL...
For univariate random sequences, the power spectral density acts like a probability density function of the frequencies present in the sequence. This dissertation extends that concept to bivariate random sequences. For this purpose, a function called the joint spectral density is defined that represents a joint probability weighing of the frequency content of pairs of random sequences. Given a pair of random sequences, the joint spectral density is not uniquely determined in the absence of any...
Topics: NASA Technical Reports Server (NTRS), BIVARIATE ANALYSIS, DENSITY DISTRIBUTION, POWER SPECTRA,...
Carbon foams produced by the controlled thermal decomposition of inexpensive coal extracts exhibit a combination of structural and thermal properties that make them attractive for aerospace applications. Their thermal conductivity can be tailored between 0.5 and 100 W/mK through precursor selection/modification and heat treatment conditions; thus, they can serve in either thermal protection or heat transfer systems such as heat exchangers. Because their structure is essentially a 3D random...
Topics: NASA Technical Reports Server (NTRS), CARBON, FOAMS, THERMAL CONDUCTIVITY, MECHANICAL PROPERTIES,...
An argument for using the information theory approach as an inference technique in solid earth geophysics. A spherically symmetric density distribution is derived as an example of the method. A simple model of the earth plus knowledge of its mass and moment of inertia lead to a density distribution which was surprisingly close to the optimum distribution. Future directions for the information theory approach in solid earth geophysics as well as its strengths and weaknesses are discussed.
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, EARTH (PLANET), GEOPHYSICS, INFORMATION...
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221
Jul 12, 2010
07/10
by
Keyser, G. L., Jr
texts
eye 221
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Both the advent of electronic displays for cockpit applications and the availability of high-capacity data transmission systems, linking aicraft with ATC ground computers, offer the opportunity of expanding the pilots' role in the distributive management process. A critical element in this process is believed to be the presentation to the pilot of his traffic situation. A representative cockpit display of traffic information (CDTI) system is presented as viewed from the pilot in the cockpit,...
Topics: DENSITY DISTRIBUTION, PRESSURE GRADIENTS, FLOW VISUALIZATION, SHEAR FLOW, SMALL PERTURBATION FLOW,...
The Solar Mesosphere Explorer (SME) satellite experiments will provide a comprehensive study of atmospheric ozone and the processes which form and destroy it. Five instruments to be carried on the spacecraft will measure the ozone density and altitude distribution, monitor the incoming solar radiation, and measure other atmospheric constituents which affect ozone. The investigative approach concept, methods and procedures, preflight studies, and orbits and mission lifetime are presented....
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CHEMISTRY, EXPLORER SATELLITES, MESOSPHERE,...
In the late seventies, an image of the large-scale structure in the Universe began to emerge as a result of the accumulation of the galaxy redshifts. Most of the galaxies are found to concentrate in large filaments and perhaps sheets leaving most of the volume empty. Similar structures were predicted theoretically in the frame of the adiabatic theory of galaxy formation (Zeldovich) and later in the hot dark matter cosmology. However, both scenarios have been ruled out by the observations. With...
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, GRAVITATION THEORY, NORMAL DENSITY...
We apply a forward model of emission from a coronal cavity in an effort to determine the temperature and density distribution in the cavity. Coronal cavities are long, low-density structures located over filament neutral lines and are often seen as dark elliptical features at the solar limb in white light, EUV and X-rays. When these structures erupt they form the cavity portions of CMEs The model consists of a coronal streamer model with a tunnel-like cavity with elliptical cross-section and a...
Topics: NASA Technical Reports Server (NTRS), CORONAS, EXTREME ULTRAVIOLET RADIATION, CORONAL HOLES,...
The joint NASA-Max Planck Institute Barium Ion Cloud (BIC) Experiment on September 21, 1971 involved the release of 1.7 kg of neutral barium at an altitude of 31,500 km at a latitude of 6.93 deg N. and a longitude of 74.40 deg W. A theoretical model describing the barium neutral cloud expansion and the ion cloud formation is developed. The mechanism of formation of the striational features observed in the release is also discussed. Two candidate instabilities, which may contribute to striation...
Topics: NASA Technical Reports Server (NTRS), BARIUM ION CLOUDS, DENSITY DISTRIBUTION, MAGNETOHYDRODYNAMIC...
Classification of remote earth resources sensing data according to normed exponential density statistics is reported. The use of density models appropriate for several physical situations provides an exact solution for the probabilities of classifications associated with the Bayes discriminant procedure even when the covariance matrices are unequal.
Topics: NASA Technical Reports Server (NTRS), BAYES THEOREM, DATA PROCESSING, REMOTE SENSORS, STATISTICAL...
A model of the spatial density distribution of large (m greater than 10(exp -3) g) cometary meteoroids in the inner solar system is obtained assuming that they have orbits closely associated with that of their parent comet. Distributions of the orbital parameters of the Taurid, Quadrantid and Perseid meteoroid streams are used in developing the model.
Topics: NASA Technical Reports Server (NTRS), METEOROIDS, QUADRANTID METEOROIDS, SPATIAL DISTRIBUTION,...
Three-dimensional reconstruction techniques used to determine coronal density distributions from synoptic data are complicated and time consuming to employ. Current techniques also assume time invariant structures and thus mix both temporal and spatial variations present in the coronal data. The observed distribution of polarized brightness, pB, and brightness, B, of coronal features observed either at eclipses or with coronagraphs depends upon both the three-dimensional distribution of...
Topics: NASA Technical Reports Server (NTRS), DENSITY DISTRIBUTION, SOLAR CORONA, SYNOPTIC MEASUREMENT,...
The models essentially consist of two parts: the basic static models, which give temperature and density profiles for the relevant atmospheric constituents for any specified exospheric temperature, and a set of formulae to compute the exospheric temperature and the expected deviations from the static models as a result of all the recognized types of thermospheric variation. For the basic static models, tables are given for heights from 90 to 2,500 km and for exospheric temperatures from 500 to...
Topics: NASA Technical Reports Server (NTRS), CHEMICAL COMPOSITION, DENSITY DISTRIBUTION, MODELS, PRESSURE,...
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166
May 31, 2011
05/11
by
Hartman, John; Kirby, Mar
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An automated eddy current system has been designed and built, and is being implemented to inspect RSRM (Space Shuttle) metal components. The system provides a significant increase in inspection reliability, as well as other benefits such as data storage, chemical waste reduction and reduction in overall process time. This paper is in viewgraph form.
Topics: FAR UV SPECTROSCOPIC EXPLORER, VELOCITY DISTRIBUTION, TEMPERATURE PROFILES, DENSITY DISTRIBUTION,...
A criterion for linear feature selection is proposed which is based on mean square apporximation of class density functions. It is shown that for the widest possible class of approximants, the criterion reduces to Devijver's Bayesian distance. For linear approximants the criterion is equivalent to well known generalized Fisher criteria.
Topics: NASA Technical Reports Server (NTRS), APPROXIMATION, DENSITY DISTRIBUTION, DISTRIBUTION (PROPERTY),...
The satellite of an S-galaxy will experience opposing dynamical-friction forces from the stars of the disk and the halo. If these forces are in balance, the satellite may travel in a stable, near-circular orbit whose radius, for a wide range of physical parameters, should be limited to a zone 1.2 to 1.4 times the disk radius, much as is observed. The idea is very simple. The dynamical friction acting on a small satellite, moving through a stellar galactic halo, makes this satellite slow down....
Topics: NASA Technical Reports Server (NTRS), DISK GALAXIES, NATURAL SATELLITES, ROTATION, STABILITY,...
