Journal of Research of the National Institute of Standards and Technology
Topics: angular-correlation coefficients, neutron beta-decay
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Jun 1, 2011
06/11
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Kerslake, Thomas W.; Gustafson, Eric D
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This paper discusses the on-orbit performance and performance degradation of the International Space Station P6 solar array wings (SAWs) from the period of December 2000 through February 2003. Data selection considerations and data reduction methods are reviewed along with the approach for calculating array performance degradation based on measured string shunt current levels. Measured degradation rates are compared with those predicted by the computational tool SPACE and prior degradation...
Topics: STATISTICAL ANALYSIS, TURBULENCE, SPECTRA, CORRELATION COEFFICIENTS, VELOCITY
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Jan 28, 2017
01/17
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IASET JOURNALS
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The present experiment was conducted in the winter season during 2009-2010 and 2010-2011 at Seed Production Farm Adisaptagram, Govt of West Bengal, Hooghly, West Bengal with nine TPS collected from AICRP on potato, BCKV centre. The nine TPS hybrids were screened and evaluated for yield and other agronomic characters viz ., plant height, number of leaves per plant, number of tubers per plant, germination%, plant vigour, tuber weight gradation: 5g, 5-10 g, 10-20 g, 20-40 g, >40 g, tuber...
Topics: TPS, Potato, Correlation Coefficients, Genetic Advance, Path Analysis
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377
Jul 6, 2010
07/10
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HOFFMAN, K
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THE EFFECT OF WATER ABSORPTION ON INFRARED REFLECTION IS USED AS A MEANS OF CONTINUOUS HUMIDITY MEASUREMENT. FOR THIS PURPOSE, THE INTENSITIES AT A MEASURED WAVELENGTH OF 1.93 MICRONS ARE COMPARED WITH THOSE OF A COMPARISON WAVELENGTH OF 1.7 MICRONS. AT THE WAVELENGTH 1.93 MICRONS, THERE IS A LARGE AMOUNT OF ABSORPTION. AT THE COMPARISON WAVELENGTH 1.7 MICRONS, THERE IS ONLY A SMALL AMOUNT OF ABSORPTION. THE DEPENDENCE OF THE REFLECTION ON THE WATER CONTENT IS STUDIED USING NUMEROUS SPECTRAL...
Topics: CORRELATION COEFFICIENTS, REVERBERATION, SOUND FIELDS, ABSORPTIVITY, ACOUSTICS, DIFFUSIVITY,...
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261
Jun 20, 2010
06/10
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Eisenberger, I
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Hypotheses and estimation of correlation coefficient using six and eight quantiles, with application to space telemetry
Topics: CORRELATION COEFFICIENTS, ESTIMATING, TELEMETRY, DATA REDUCTION, DATA SYSTEMS, HYPOTHESES,...
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605
Jul 6, 2010
07/10
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ZELDOVICH, Y. B
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THE DISTRIBUTION OF THE CONCENTRATION PRODUCTS AND TEMPERATURE IS DISCUSSED IN THE COMBUSTION OF MIXED GASES. IT IS SHOWN THAT IN THE SIMPLEST CONDITIONS THESE CONCENTRATIONS AND TEMPERATURE AT THE SURFACE OF A FLAME ARE THE SAME AS IN THE COMBUSTION OF PREVIOUSLY PREPARED STOICHIOMETRIC MIXTURES OF THE SAME GASES. A POSSIBLE LIMIT WAS FOUND TO THE INTENSIFICATION OF COMBUSTION OF UNMIXED GASES, DEPENDING UPON THE LIMITING RATE OF THE CHEMICAL REACTION. IN ORDER OF MAGNITUDE, THIS LIMIT IS...
Topics: ATS 1, GEOMAGNETISM, MAGNETIC DISTURBANCES, MICROPULSATIONS, CORRELATION COEFFICIENTS, LEAST...
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Jul 5, 2010
07/10
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Berman, P. A.; Yasui, R. K
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A series of summary curves is presented for cells having various contact systems, depicting the effects of temperature exposure as a function of time on the electrical and mechanical characteristics. Each curve represents the results obtained from a minimum of 32 and a maximum of 1104 individual data inputs and includes the 95% confidence limits associated with each time-temperature combination for which measurements were obtained. The curves are useful for detailed analysis and comparison of...
Topics: ASTRONOMICAL MODELS, COMPUTER PROGRAMS, CORRELATION COEFFICIENTS, ECLIPSING BINARY STARS,...
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196
Jul 12, 2010
07/10
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Yglesias, J. A
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Procedures and techniques are discussed for retrieving payloads that are inertially or local vertical/local horizontal (LVLH) stabilized. Selection of the retrieval profile to be used depends on several factors: (1) control authority of the payload, (2) payload sensitivity to primary reaction control system (PRCS) plumes, (3) whether the payload is inertially or LVLH stabilized, (4) location of the grapple fixture, and (5) orbiter propellant consumption. The general retrieval profiles...
Topics: BIVARIATE ANALYSIS, COMPUTER PROGRAMS, PROBABILITY DISTRIBUTION FUNCTIONS, CORRELATION...
Investigations were carried out on Response of Maize (Zea mays L.) grain yield (kg/ha) and ratio (kg/kg) to the nutrients applications in Telangana state (Soil Test Crop Response Correlation) during 2008 and 2009 at Regional Agricultural Research Station, Warangal. The experiment were conducted at different sites adjacent to each other on a sandy clay loam soil having a low status in available nitrogen (272kg/ha) in the first year and medium (323kg N/ha) in the second year. The soil available...
Topics: Correlation Coefficients, Drymass and Grain Yield of Maize, Nutrients Supplied Through Soil &...
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297
Jul 11, 2010
07/10
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Alexander, A. D., II
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The United States transportation fuel economics in terms of fuel resources options, processing alternatives, and attendant economics for the period 1975 to 1995 are evaluated. The U.S. energy resource base is reviewed, portable fuel-processing alternatives are assessed, and selected future aircraft fuel options - JP fuel, liquid methane, and liquid hydrogen - are evaluated economically. Primary emphasis is placed on evaluating future aircraft fuel options and economics to provide guidance for...
Topics: ACTIVITY CYCLES (BIOLOGY), ENVIRONMENTAL TESTS, LOCOMOTION, SWINE, BIOLOGICAL EFFECTS, CORRELATION...
Small scale nozzle tests using heated nitrogen were run to obtain effectiveness and wall heat transfer data with hydrogen film cooling. Effectiveness data are compared with an entrainment model developed from planar, unaccelerated flow data. Results indicate significant effects due to flow turning and acceleration. With injection velocity effects accounted for explicitly, heat transfer correlation coefficients were found to be the same with and without film cooling when properties are evaluated...
Topics: NASA Technical Reports Server (NTRS), FILM COOLING, HEAT TRANSFER, NITROGEN, NOZZLES, CORRELATION...
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Jul 11, 2010
07/10
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CARL, H.; BOHM, H.; POH, F. A
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IT IS SHOWN THAT THE WC/C FUEL CELL OFFERS AN EXCELLENT ALTERNATIVE TO CONVENTIONAL POWER SOURCES FOR MANY APPLICATIONS. THREE DEMONSTRATION EXAMPLES ARE PRESENTED FOR ILLUSTRATION: (1) ELECTRIC TRUCKS FOR INDUSTRIAL WAREHOUSE AND PLANT APPLICATIONS; (2) FORK LIFT TRUCKS; AND (3) POWER SUPPLY FOR RADIO LINK STATIONS.
Topics: CORRELATION COEFFICIENTS, DYNAMIC MODELS, MODAL RESPONSE, VIKING ORBITER SPACECRAFT, COUPLING...
Two algorithms for the search of signals in noise are constructed. Two independent measurable properties of a discreet time-dependent stochastic process F are described. The functions A sub K and B sub K fully satisfy conditions for the application of a test based on Spearman's rank correlation coefficient. A statistic to which the one-sided signal test can be applied is constructed under sufficiently natural assumptions about the noise process. The constructed statistics are simplified....
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, SIGNAL DETECTION, CORRELATION COEFFICIENTS,...
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May 23, 2011
05/11
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Bargar, Robi
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The commercial music industry offers a broad range of plug 'n' play hardware and software scaled to music professionals and scaled to a broad consumer market. The principles of sound synthesis utilized in these products are relevant to application in virtual environments (VE). However, the closed architectures used in commercial music synthesizers are prohibitive to low-level control during real-time rendering, and the algorithms and sounds themselves are not standardized from product to...
Topics: CAUCHY PROBLEM, CROSS CORRELATION, SEMICONDUCTOR JUNCTIONS, SEMICONDUCTOR DIODES, PHOTONS, JUNCTION...
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Jun 9, 2011
06/11
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Cabell, Randolph H.; Gibbs, Gary P.; Sprofera, Joseph D.; Clark, Robert L
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Turbulent boundary layer (TBL) noise is considered a primary factor in the interior noise experienced by passengers aboard commercial airliners. There have been numerous investigations of interior noise control devoted to aircraft panels; however, practical realization is a challenge since the physical boundary conditions are uncertain at best. In most prior studies, pinned or clamped boundary conditions have been assumed; however, realistic panels likely display a range of varying boundary...
Topics: CORRELATION COEFFICIENTS, LINEAR TRANSFORMATIONS, TENSOR ANALYSIS, ORTHOGONALITY, COST ESTIMATES,...
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May 23, 2011
05/11
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Eberhardt, Scott; Wibowo, Pratomo; Tu, Eugen
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The procedure to generate the grid around a complex wing configuration is presented in this report. The automatic grid generation utilizes the Modified Advancing Front Method as a predictor and an elliptic scheme as a corrector. The scheme will advance the surface grid one cell outward and the newly obtained grid is corrected using the Laplace equation. The predictor-corrector step ensures that the grid produced will be smooth for every configuration. The predictor-corrector scheme is extended...
Topics: PHYSICAL EXERCISE, CORONARY ARTERY DISEASE, CORRELATION COEFFICIENTS, URIC ACID, HEART RATE,...
New regularities for short-perihelion comets are found. Distant nodes of cometary orbits of Kreutz family are concentrated in a plane with ascending node 76 and inclination 267 at the distance from 2 up to 3 a.u. and in a very narrow interval of longitudes. There is a correlation dependence between q and cos I concerning the found plane (coefficient of correlation 0.41). Similar results are received regarding to cometary families of Meyer, Kracht and Marsden. Distant nodes of these comets are...
Topics: NASA Technical Reports Server (NTRS), COMETS, STELLAR EVOLUTION, STREAMS, METEOROIDS, PERIHELIONS,...
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2.0K
Jul 21, 2010
07/10
by
NON
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Sessions conducted included: polysilicon material requirements; economics; process development in the U.S.; international process development; and polysilicon market and forecasts. Twenty-one papers were presented and discussed.
Topics: APPLICATIONS PROGRAMS (COMPUTERS), SYMMETRY, VIBRATION MODE, DYNAMIC STRUCTURAL ANALYSIS, NASTRAN,...
Forecast and climate simulation experiments were conducted with a medium mesh (8 degrees of latitude by 10 degrees of longitude) 7 layer climate model. The outputs emphasized are: (1) monthly mean forecasts for the months of October 1976 through February 1977 generated from global initial conditions for the first day of each month; and (2) a model climatology generated by running the model for five simulated years from one set of initial conditions (1 December 1967) and averaging the 5 outputs...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, CLIMATOLOGY, WEATHER FORECASTING, CLIMATE...
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May 23, 2011
05/11
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Trasco, John D
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A joint agreement between NASA/Goddard and The University of Maryland currently supports cooperative research in Satellite Based Studies of Photons and Charged Particles in the following areas: 1) Detection of cosmic rays and studies of the solar modulation of galactic cosmic rays; 2) Research with several past and upcoming X-ray satellites; 3) High resolution gamma-ray spectroscopy of celestial sources; 4) Theoretical astrophysics.
Topics: ALTIMETERS, CORRELATION COEFFICIENTS, TIME SERIES ANALYSIS, VARIABILITY, ASSIMILATION, GULF STREAM,...
Correlation between frequency of magnetic oscillations and geomagnetic disturbances, and low frequency oscillation of earth magnetic field
Topics: NASA Technical Reports Server (NTRS), ATS 1, GEOMAGNETISM, MAGNETIC DISTURBANCES, MICROPULSATIONS,...
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294
May 23, 2011
05/11
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Wu, Yunqin
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Reliable Multicast Protocol (RMP) is a communication protocol that provides an atomic, totally ordered, reliable multicast service on top of unreliable IP Multicasting. In this paper, we develop formal models for R.W using existing automatic verification systems, and perform verification-based analysis on the formal RMP specifications. We also use the formal models of RW specifications to generate a test suite for conformance testing of the RMP implementation. Throughout the process of RMP...
Topics: CORRELATION COEFFICIENTS, BINARY DATA, OPTICAL FILTERS, SIGNAL TO NOISE RATIOS, IMAGE CORRELATORS,...
A technique for fitting a straight line to a collection of data points is given. The relationships between the slopes and correlation coefficients, and between the corresponding standard deviations and correlation coefficient are given.
Topics: NASA Technical Reports Server (NTRS), CORRELATION COEFFICIENTS, DATA PROCESSING, NUMERICAL...
High altitude ocean color scanner ratios of band 2 (456 to 476 nanometers) to band 4 (539 to 559 nanometers) and band 1 (418 to 438 nanometers) to band 3 (498 to 518 nanometers) had high correlation coefficient values (-0.928 and 0.891 respectively) with seven boat sampled chlorophyll a measurements. The range of chlorophyll a concentrations was small (1.7-2.58 mg/cu m.). Each ratio was used to calculate chlorophyll a values for the center pixel of each scan line on flight lines 5 and 6. The...
Topics: NASA Technical Reports Server (NTRS), CHLOROPHYLLS, COASTAL WATER, OCEAN COLOR SCANNER, CORRELATION...
Tensile properties in defect-free weldments of aluminum alloys 2014-T6 and 2219-T87 (sheet and plate) are shown to be related to the level or concentration of induced simulated porosity. The scatter diagram shows that the ultimate tensile strength of the weldments displays the most pronounced linear relationship with the level of porosity. The relationships between yield strength or elongation and porosity are either trivial or inconsequential in the lower and intermediate levels of porosity...
Topics: NASA Technical Reports Server (NTRS), ALUMINUM ALLOYS, POROSITY, TENSILE STRENGTH, WELDED JOINTS,...
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Jul 12, 2010
07/10
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Thoren, R. J
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A microcomputer based automatic test system was developed for the daily performance monitoring of wind energy system time domain (WEST) analyzer. The test system consists of a microprocessor based controller and hybrid interface unit which are used for inputing prescribed test signals into all WEST subsystems and for monitoring WEST responses to these signals. Performance is compared to theoretically correct performance levels calculated off line on a large general purpose digital computer....
Topics: COMPUTER GRAPHICS, MATHEMATICAL MODELS, PLOTTERS, GERT, MULTIVARIATE STATISTICAL ANALYSIS,...
The relations between the north-south anisotropy of cosmic rays and/or nucleonic intensity variation and the latitudinal angular distance (lambda) of the Earth from the neutral sheet is examined using the data in the period from Apr. 1976 to Aug. 1977 at the solar minimum. It is found that the nucleonic intensity variation of the cosmic rays has no correlation with sin lambda in this period as shown in a correlation diagram; but the amplitude of the north-south anisotropy is fairly correlated...
Topics: NASA Technical Reports Server (NTRS), ANISOTROPY, NEUTRAL SHEETS, SOLAR COSMIC RAYS, CORRELATION...
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Jun 2, 2011
06/11
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Lee, Jeffrey; Lockwood, Denni
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This document is a compendium of the WFF TOPEX Software Development Team's knowledge regarding Sensor Data Record (SDR) Processing. It includes many elements of a requirements document, a software specification document, a software design document, and a user's manual. In the more technical sections, this document assumes the reader is familiar with TOPEX and instrument files.
Topics: MULTISENSOR APPLICATIONS, PIXELS, GROUND TRUTH, RADIOMETERS, CORRELATION COEFFICIENTS, WAVELET...
A method has been devised to determine the spherical harmonic coefficients of the lunar gravity field. This method consists of a two-step data reduction and estimation process. In the first step, a weighted least-squares empirical orbit determination scheme is applied to Doppler tracking data from lunar orbits to estimate long-period Kepler elements and rates. Each of the Kepler elements is represented by an independent function of time. The long-period perturbing effects of the earth, sun, and...
Topics: NASA Technical Reports Server (NTRS), CORRELATION COEFFICIENTS, LUNAR GRAVITATION, SPHERICAL...
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Jun 12, 2011
06/11
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Montes, Marcos J.; Gao, Bo-Cai; Davis, Curtiss O.; Moline, Mar
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We previously developed an algorithm named Tafkaa for atmospheric correction of remote sensing ocean color data from aircraft and satellite platforms. The algorithm allows quick atmospheric correction of hyperspectral data using lookup tables generated with a modified version of Ahmad & Fraser s vector radiative transfer code. During the past few years we have extended the capabilities of the code. Current modifications include the ability to account for within scene variation in solar...
Topics: NAVIER-STOKES EQUATION, COMBUSTION, NONLINEARITY, DESIGN OPTIMIZATION, COMPUTATIONAL FLUID...
The focus of this project is to use Infrared Thermography, a non-destructive test, to detect detrimental cracks and voids beneath the surface of materials used in the space program. This project will consist of developing a simulation model of the Infrared Thermography inspection of the Graphite/Epoxy specimen. The simulation entails finding the correct physical properties for this specimen as well as programming the model for thick voids or flat bottom holes. After the simulation is completed,...
Topics: NASA Technical Reports Server (NTRS), GRAPHITE-EPOXY COMPOSITES, THERMOGRAPHY, INFRARED RADIATION,...
Correlation coefficients were computed to investigate the parameters for describing the spherical model of an eclipsing binary system. Regions in parameter hyperspace were identified where strong correlations exist and, by implication, the solution determinacy is low. The results are presented in tabular form for a large number of system configurations.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL MODELS, COMPUTER PROGRAMS, CORRELATION...
Second order turbulence models describe the effect of mean flow and external agencies (such as buoyancy) on the evolution of turbulence. Therefore, in principle, these models give a more accurate description of complicated flow fields (e.g. flows with large anisotropy in turbulence, such as near the leading edge of a turbine blade) than the two equation models. The objectives of this document are to assess the performance of the various second order turbulence models in benchmark flows and to...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, REYNOLDS STRESS, TRANSPORT...
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Jun 21, 2010
06/10
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Nottebohm, W.; Riesenfeld, E. H
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Oxidation method for preparation of alkaline earth peroxides
Topics: BLUNT BODIES, STAGNATION POINT, SUBSONIC FLOW, BOW WAVES, SHOCK WAVES, ATMOSPHERIC ENTRY,...
Correlated squeezed states for a quantum oscillator are constructed based on the method of quantum integrals of motion. The quantum oscillator is acted upon by short duration pulses. Three delta-kickings of frequency are used to model the pulses' dependence upon the time aspects of the frequency of the oscillator. Additionally, the correlation coefficient and quantum variances of operations of coordinates and momenta are written in explicit form.
Topics: NASA Technical Reports Server (NTRS), CORRELATION COEFFICIENTS, HARMONIC OSCILLATORS, PHASE-SPACE...
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May 31, 2011
05/11
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Lobmeyer, Dennis A.; Meneghelli, Barr
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The aerospace industry has long been perceived as the domain of both physicists and mechanical engineers. This perception has endured even though the primary method of providing the thrust necessary to launch a rocket into space is chemical in nature. The chemical engineering and chemistry personnel behind the systems that provide access to space have labored in the shadows of the physicists and mechanical engineers. As exploration into the cosmos moves farther away from Earth, there is a very...
Topics: SEA ICE, SATELLITE OBSERVATION, REGRESSION ANALYSIS, LANDSAT SATELLITES, ARCTIC OCEAN, MICROWAVE...
Statistics are emphasized as an important role in quality control and reliability. Consequently, Trend Analysis Techniques recommended a variety of statistical methodologies that could be applied to time series data. The major goal of the working handbook, using data from the MSFC Problem Assessment System, is to illustrate some of the techniques in the NASA standard, some different techniques, and to notice patterns of data. Techniques for trend estimation used are: regression (exponential,...
Topics: NASA Technical Reports Server (NTRS), ESTIMATING, FAILURE ANALYSIS, HANDBOOKS, QUALITY CONTROL,...
The lack of progress in understanding the physics of rotorcraft loads and vibration over the last 30 years is addressed in this paper. As befits this extraordinarily difficult problem, the reasons for the lack of progress are complicated and difficult to ascertain. It is proposed here that the difficulty lies within at least three areas: 1) a loss of perspective as to what are the key factors in rotor loads and vibration, 2) the overlooking of serious unsolved problems in the field, and 3)...
Topics: NASA Technical Reports Server (NTRS), AEROELASTICITY, ROTARY WING AIRCRAFT, VIBRATORY LOADS,...
Examined are sunspot cycle- (SC-) length averages of the annual January-December values of the Global Land-Ocean Temperature Index (<GLOTI>) in relation to SC-length averages of annual values of various descriptors of solar-geomagnetic activity and climate, incorporating lags of 0-5 yr. For the overall interval SC12-SC23, the <GLOTI> is inferred to correlate best against the parameter <aa(I:SSN)> incorporating lag = 5 yr, where the parameter...
Topics: NASA Technical Reports Server (NTRS), SOLAR ACTIVITY, SUNSPOT CYCLE, SUNSPOTS, OCEAN TEMPERATURE,...
Software development predictors, error analysis, reliability models and software metric analysis are studied. The use of dynamic characteristics as predictors for software development is also studied.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, ERROR ANALYSIS, METROLOGY, PREDICTION...
The distributions of the Mn-53 contents in 106 nonantarctic and 112 antarctic chondrites were analyzed. A correlation analysis of these distributions showed that the correlation coefficient is a maximum r sub max = 0.75 plus or minus 0.03) when the histogram for antarctic chondrites is displaced by 40 plus or minus 8 dpm kg-1Fe towards lower Mn-53 contents. The distribution of Mn-53 saturated contents in nonantarctic ordinary chondrites was investigated as a function of their radiation age (T)....
Topics: NASA Technical Reports Server (NTRS), CHONDRITES, COSMIC RAYS, DISTRIBUTION (PROPERTY), MANGANESE...
Introduction: Microgravity induces cardiovascular adaptations resulting in orthostatic intolerance on re-exposure to normal gravity. Orthostasis could interfere with performance of complex tasks during the re-entry phase of Shuttle landings. This study correlated measures of Shuttle landing performance with post-flight indicators of orthostatic intolerance. Methods: Relevant Shuttle landing performance parameters routinely recorded at touchdown by NASA included downrange and crossrange...
Topics: NASA Technical Reports Server (NTRS), CARDIOVASCULAR SYSTEM, BLOOD PRESSURE, GRAVITATION,...
Examined are single- and bi-variate geomagnetic precursors for predicting the maximum amplitude (RM) of a sunspot cycle several years in advance. The best single-variate fit is one based on the average of the ap index 36 mo prior to cycle minimum occurrence (E(Rm)), having a coefficient of correlation (r) equal to 0.97 and a standard error of estimate (se) equal to 9.3. Presuming cycle 24 not to be a statistical outlier and its minimum in March 2008, the fit suggests cycle 24 s RM to be about...
Topics: NASA Technical Reports Server (NTRS), SUNSPOT CYCLE, SOLAR WIND VELOCITY, PREDICTIONS,...
The author has identified the following significant results. Measurements made at 13.9 GHz with the radar scatterometer on Skylab have been combined to produce median curves of the variation of scattering coefficient with angle of incidence out to 45 deg. Because of the large number of observations, and the large area averaged for each measured data point, these curves may be used as a new design base for radars. A reasonably good fit at larger angles is obtained using the theoretical...
Topics: NASA Technical Reports Server (NTRS), RADAR MEASUREMENT, RADAR SCATTERING, SCATTERING COEFFICIENTS,...
Algorithms were developed for the extraction of two components of mean velocity, standard deviation, and the associated correlation coefficient from laser transit anemometry (LTA) data ensembles. The solution method is based on an assumed two-dimensional Gaussian probability density function (PDF) model of the flow field under investigation. The procedure consists of transforming the data ensembles from the data acquisition domain (consisting of time and angle information) to the velocity space...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, FLOW DISTRIBUTION, LASER ANEMOMETERS, PROBABILITY...
This paper presents the results of the correlation analysis of the Skylab S-193 13.9 GHz Radiometer/Scatterometer data. Computer analysis of the S-193 data shows more than 50 percent of the radiometer and scatterometer data are uncorrelated. The correlation coefficients computed for the data gathered over various ground scenes indicates the desirability of using both active and passive sensors for the determination of various Earth phenomena.
Topics: NASA Technical Reports Server (NTRS), CORRELATION COEFFICIENTS, MICROWAVE RADIOMETERS, MICROWAVE...
Some techniques for comparing structural vibration data determined from test and analysis are discussed. Orthogonality is a general category of one group, correlation is a second, synthesis is a third and matrix improvement is a fourth. Advantages and short-comings of the methods are explored with suggestions as to how they can complement one another. The purpose for comparing vibration data from test and analysis for a given structure is to find out whether each is representing the dynamic...
Topics: NASA Technical Reports Server (NTRS), CORRELATION COEFFICIENTS, MATRICES (MATHEMATICS),...
As a preliminary step to developing a technique to eliminate the topographic effect from remotely sensed data, two radiance simulation models were examined and compared. A Lambertian and a non-Lambertian model were tested using hand-held radiometer measurements from a uniform surface at different slope angle aspect orientations. Linear correlation coefficients for the non-Lambertian model and the field spectra were calculated to be greater than 0.92 for all cases; whereas correlation...
Topics: NASA Technical Reports Server (NTRS), MATHEMATICAL MODELS, MULTISPECTRAL PHOTOGRAPHY, RADIANCE,...
Spectra acquired by the Airborne Imaging Spectrometer (AIS) near Lafayette, IN, Ely, MN, and over the Stanford University campus, CA were analyzed for fine spectral structure using two techniques: the ratio of radiance of a ground target to the radiance of a standard and also the correlation coefficient of radiances at adjacent wavelengths. The results show ramp like features in the ratios. These features are due to the biochemical composition of the leaf and to the optical scattering...
Topics: NASA Technical Reports Server (NTRS), AGRICULTURE, CITIES, FORESTS, IMAGING SPECTROMETERS, SPECTRUM...
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Jun 20, 2010
06/10
by
Kruger, B
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General equations for standard deviation, and rms standard deviation of least squares fitted polynomials applied to Apollo tracking problems
Topics: APOLLO PROJECT, TRAJECTORY ANALYSIS, WAVE PROPAGATION, POLYNOMIALS, SPACECRAFT TRACKING,...
