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Oct 6, 2015
10/15

by
Faybusovich, L.;Ammar, Gregory S.;Gragg, William B.

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Technical report for period July 1992 - September 1992.

Topic: INVERSION.,MATRICES(MATHEMATICS).,ORTHOGONALITY.

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49

Oct 8, 2015
10/15

by
Demmel, J. W.;Gragg, William B.

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Title from cover

Topic: EIGENVALUES.,COMPUTATIONS.,MATRICES(MATHEMATICS).

Naval Postgraduate School

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133

Jan 24, 2013
01/13

by
Faybusovich, L.;Ammar, Gregory S.;Gragg, William B.

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Technical report for period July 1992 - September 1992.

Topics: INVERSION., MATRICES(MATHEMATICS)., ORTHOGONALITY.

Title from cover

Topics: EIGENVALUES., COMPUTATIONS., MATRICES(MATHEMATICS).

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398

Jul 11, 2010
07/10

by
ARGYRIS, J. H.; LOCHNER, N. M.; SCHARPF, D. W

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THE APPLICATION OF THE MATRIX THEORY OF STATICS AND DYNAMICS TO THE CALCULATION OF NATURAL MODES OF OSCILLATION OF ROTOR BLADES IS DESCRIBED. THE BASIC PRINCIPLES OF THE MATRIX DISPLACEMENT METHOD ARE SUMMARIZED. THE IDEALIZED ROTOR BLADE IS BROKEN DOWN INTO ELEMENTS; THEIR ELASTIC REGIDITIES AND KINEMATICALLY EQUIVALENT POINT FORCES AND MOMENTS APPLIED TO NODES, RATHER THAN BEING DISTRIBUTED, ARE DERIVED. THE CORRESPONDING KINEMATICALLY EQUIVALENT MASS MATRIX IS ALSO OBTAINED. THESE AND...

Topics: ARTIFICIAL SATELLITES, ALGORITHMS, MATRICES (MATHEMATICS), SATELLITE ORIENTATION

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140

Jun 17, 2010
06/10

by
Mc Lean, J. D

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No Abstract Available

Topics: APPROXIMATION, COEFFICIENTS, ERRORS, LUNAR TRAJECTORIES, MATRICES (MATHEMATICS)

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54

Oct 6, 2015
10/15

by
Gastrock, Barry Allen

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Thesis advisor(s): Miller, James A

Topic: Aeronautics,Laminar boundary layer,Matrices,Mathematics

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180

May 31, 2011
05/11

by
Troutman, Patrick A.; Krizan, Shawn A; Mazanek, Daniel D.; Stillwagen, Frederic H.; Antol, Jeffrey; Sarver-Verhey, Timothy R.; Chato, David J.; Saucillo, Rudolf J.; Blue, Douglas R.; Carey, David

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This paper summarizes the results of a NASA lead study performed to identify synergistic opportunities and concepts between human exploration initiatives and commercialization of space. The goal of this initiative, called Orbital Aggregation & Space Infrastructure Systems (OASIS), is to develop an in-space architecture and associated concepts that provide common infrastructure for enabling a large class of space missions. The concepts include communications, navigation and power systems,...

Topics: COVARIANCE, MATRICES (MATHEMATICS), QUATERNIONS, ROTATION, KALMAN FILTERS, NORMALITY, REGULARITY

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245

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The World Weather Program which is composed of the World Weather Watch, the Global Atmospheric Research Program, and the Systems Design and Technological Development Program is presented. The U.S. effort for improving the national weather services through advances in science, technology and expanded international cooperation during FY 72 are described. The activities of the global Atmospheric Research Program for last year are highlighted and fiscal summary of U.S. programs is included.

Topics: LEAST SQUARES METHOD, PROBABILITY THEORY, STATISTICS, MATRICES (MATHEMATICS), SATELLITE TRACKING

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192

Jul 6, 2010
07/10

by
GAVIGLIO, J

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TWO METHODS ARE MENTIONED WHICH ARE USED TO DETERMINE THE SENSITIVITY OF HOT-WIRE ANEMOTHERMOMETERS USED TO ANALYZE THE TURBULENCE OF SUPERSONIC FLOWS. ONE METHOD IS IMPRECISE WITH THE LOWER REYNOLDS NUMBERS, BUT THE APPLICATION IS RELATIVELY EASY; THE OTHER IS PRECISE, HOWEVER, DIFFICULT TO IMPLEMENT. NEW RESULTS FROM EXPERIMENTS ALLOW THE RESPECTIVE ADVANTAGES OF THESE TWO METHODS TO BE COMBINED.

Topics: CODING, DISCRETE FUNCTIONS, COMBINATIONS (MATHEMATICS), CONVERGENCE, MATRICES (MATHEMATICS)

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318

May 23, 2011
05/11

by
Long, Christopher C.; Horan, Stephe

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A concept for the addition of a Demand Assignment Multiple Access (DAMA) service to NASA's current Space Network (SN) is developed. Specifically, the design of a receiver for the DAMA channel is outlined. Also, an outline of the procedures taken to process the received service request is presented. The modifications to the (SN) system are minimal. The post reception processing is accomplished using standard commercial off the shelf (COTS) packages. The result is a random access system capable...

Topics: CODING, ALGEBRA, MATRICES (MATHEMATICS), PARITY, LINEAR EQUATIONS, THEOREMS, GEOMETRY

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231

Jul 6, 2010
07/10

by
KRASNOVSKIY, A. A.; UMRIKHINA, A. V

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THE USE OF MODEL SYSTEMS SIMULATING PREBIOLOGICAL CONDITIONS ON EARTH TO STUDY THE PROBLEM OF THE ABIOGENETIC FORMATION OF PORPHYRINS DURING THE CHEMICAL EVOLUTION PROCESS IS DISCUSSED.

Topics: DISCRETE FUNCTIONS, MATRICES (MATHEMATICS), RANDOM PROCESSES, CORRELATION, DIGITAL FILTERS,...

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168

Jun 9, 2011
06/11

by
Rogers, J. L

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Many companies are looking for new tools and techniques to aid a design manager in making decisions that can reduce the time and cost of a design cycle. One tool is the Design Manager's Aid for Intelligent Decomposition (DeMAID). Since the initial public release of DeMAID in 1989, much research has been done in the areas of decomposition, concurrent engineering, parallel processing, and process management; many new tools and techniques have emerged. Based on these recent research and...

Topics: ILL-CONDITIONED PROBLEMS (MATHEMATICS), MATRICES (MATHEMATICS), ESTIMATORS, NONLINEAR SYSTEMS,...

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199

Jul 12, 2010
07/10

by
Benjamin, P

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No Abstract Available

Topics: MATRICES (MATHEMATICS), SPACECRAFT, SYSTEMS ANALYSIS, CONTRACTION, DEGREES OF FREEDOM, STIFFNESS

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5.0

Dec 11, 2019
12/19

by
Symposium on Sparse Matrices and Their Applications (1971 : Yorktown Heights, N.Y.)

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xii, 215 pages 27 cm

Topics: Matrices -- Congresses, Matrices -- Congrès, Matrices, MATRICES, MATRICES (MATHEMATICS), Matrices...

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373

Jul 25, 2010
07/10

by
NON

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A common recommendation is established for the implementation of a spacecraft telecommand data routing service by the agencies participating in the CCSDS. The operating principles and procedures for the CCSDS are defined in a reference. The context of the data routing service within the overall telecommand system is described in another reference. This recommendation addresses the procedures and data unit formats implemented within the segmentation layer and the transfer layer of the...

Topics: ALGORITHMS, COMPUTER NETWORKS, REFINING, BANDWIDTH, GRID GENERATION (MATHEMATICS), MATRICES...

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213

Jul 6, 2010
07/10

by
POKRZYWNICKI, J

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THE TERM COSMIC DUST IS DEFINED, AND THE FINDING OF COSMIC DUST ON EARTH AND IN THE SOLAR SYSTEM IS DISCUSSED. THE BASIS FOR CALCULATING THE QUANTITY OF COSMIC DUST FALLING ON EARTH USED BY VARIOUS INVESTIGATORS IS PRESENTED.

Topics: APPROXIMATION, NONLINEAR EQUATIONS, ROOTS OF EQUATIONS, EUCLIDEAN GEOMETRY, MATRICES (MATHEMATICS)

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640

Jun 21, 2010
06/10

by
NON

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Development of radiation sensor subsystems for advanced manned space missions

Topics: MATRICES (MATHEMATICS), MULTIPOLES, S MATRIX THEORY, MICROWAVE CIRCUITS

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185

May 23, 2011
05/11

by
Pinelli, Thomas E.; Barclay, Rebecca O.; Kennedy, John M

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The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. To help establish a body of knowledge, the U.S. government technical report is being investigated as part of the NASA/DOD Aerospace Knowledge Diffusion Research...

Topics: POLYNOMIALS, DISTANCE, ERROR CORRECTING CODES, MATRICES (MATHEMATICS), THEOREMS, FUNCTION SPACE

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Jul 11, 2010
07/10

by
YELIZAVETIN, G

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DURING ITS FLIGHT OF SEPT. 1973, SOYUZ 12 SERVED AS AN ASTROPHYSICAL LABORATORY. EXPERIMENTS WERE CONDUCTED IN WHICH SPECTROGRAMS WERE TAKEN OF THE EARTH'S SURFACE TO LOCATE MINERAL RESOURCES, AND INVESTIGATIONS OF THE EARTH'S ATMOSPHERE WERE MADE. ABOARD SOYUZ 13, LAUNCHED ON DEC. 18, ASTROPHYSICAL OBSERVATIONS OF STARS IN THE ULTRAVIOLET RANGE WERE CONDUCTED. TESTS WERE MADE ON THE DERIVATION OF NEEDED PROTEIN WITHIN THE LIFE-SUPPORT SYSTEM OF THE VEHICLE AND THE CIRCULATION OF THE BRAIN WAS...

Topics: CAUCHY PROBLEM, PARTIAL DIFFERENTIAL EQUATIONS, MATRICES (MATHEMATICS), PROBLEM SOLVING

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447

Jul 10, 2010
07/10

by
Robinson, F

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A test program was conducted to isolate and evaluate the individual noise sources of a light helicopter. To accomplish this, the helicopter was mounted on a special test rig, at a 6-foot skid height, in a simulated hover. The test rig contained by dynamometer for absorbing engine power and an exhaust silencing system for reducing engine noise. This test set-up allowed the various components of the helicopter to be run and listened to individually or in any combination. The sound pressure level...

Topics: LIGHT SCATTERING, POLARIZATION (WAVES), SEA WATER, MATRICES (MATHEMATICS), SCATTERING COEFFICIENTS

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Jun 21, 2010
06/10

by
NON

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Space Programs Summary - supporting research and advanced development

Topics: CONTROL, INDUSTRIES, SYSTEMS ENGINEERING, EQUILIBRIUM, MATHEMATICAL MODELS, MATRICES (MATHEMATICS),...

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193

Jul 5, 2010
07/10

by
Frolov, U

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No Abstract Available

Topics: LINEAR SYSTEMS, PERIODIC FUNCTIONS, DIFFERENTIAL EQUATIONS, MATRICES (MATHEMATICS), THEOREM PROVING

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387

Jul 11, 2010
07/10

by
NON

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No Abstract Available

Topics: MATRICES (MATHEMATICS), MULTIPLICATION, THEOREM PROVING, ALGEBRA, OPERATORS (MATHEMATICS)

The concepts of Hermitian preserving and nonnegativity preserving subspace of complex square matrices are introduced. Characterizations of such subspaces are obtained and applications are discussed. Keywords: Hermitian preserving subspace; symmetry preserving subspace; nonnegativity preserving subspace.

Topics: DTIC Archive, Mathew,T, PITTSBURGH UNIV PA CENTER FOR MULTIVARIATE ANALYSIS,...

An identity in matrix theory is derived which yields a number of interesting inequalities.

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *IDENTITIES, *INEQUALITIES, *MATRICES(MATHEMATICS),...

Let z be an eigenvector of the adjacency matrix A of a connected graph G. Say a vertix is positive, nonnegative, zero, etc. if the same is true of the corresponding element of z. If z is an eigenvector for the second largest eigenvalue of A, it is known that the nonnegative vertices of G form a connected subgraph. This separation of vertices according to sign provides the basis for studying the structure of G as revealed by its eigenvectors, inequalities on the number of edges joining positive...

Topics: DTIC Archive, Powers, David L, CLARKSON UNIV POTSDAM NY, *GRAPHS, EIGENVECTORS, INEQUALITIES,...

Considered is a round robin tournament in which each player plays one game with every other player, and assume that each game ends in a win for one of the players. The results of such a tournament can be recorded in a square (0, 1)matrix T = (t sub ij) by setting t sub ij = 1 or 0 according as player i defeats or loses to player j, and t sub ii = 0. This Memorandum studies the class of all tournament matrices having prescribed row sums r sub 1 r sub 2 ... r sub n. In particular, simple...

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *GAME THEORY, *MATRICES(MATHEMATICS), INEQUALITIES, LINEAR...

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238

Jun 13, 2011
06/11

by
Hargens, Alan R.; Cao, Peihong, et al; Lee, Stuart M. C.; Schneider, Suzanne M.; Boda, Wanda L.; Smith, Scott M.; Macias, Brandon R.; OLeary, Deborah D.; Meyer, R. Scott; Groppo, Eli R.

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Current exercise systems for space, which attempt to maintain performance, are unable to generate cardiovascular and musculoskeletal loads similar to those on Earth [1, 2]. The purpose of our research is to evaluate the use of lower body negative pressure (LBNP) treadmill exercise to prevent deconditioning during simulated microgravity.

Topics: GENETIC ALGORITHMS, MATRICES (MATHEMATICS), COMPUTER PROGRAMS, OPTIMIZATION, AUTOMATION,...

In this paper we consider the rational canonical form of arbitrary polyphase matrices and use it to derive a simple implementation of paraunitary filter banks (PUFBs) based on a cascade of elementary building blocks. Furthermore, this decomposition is shown to be easily extendable to include a large class of perfect reconstruction filter banks (PRFBs) and can be especially useful for deriving the initial condition of PUFB design algorithms.

Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC, *SIGNAL PROCESSING, FILTERS, MATRICES(MATHEMATICS),...

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211

May 23, 2011
05/11

by
Johnston, Patrick H.; Kishoni, Doro

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The mapping of one pulsed waveform into another, more desirable waveform by the application of a time-domain filter has been employed in a number of NDE situations. The primary goal of these applications has been to improve the range resolution of an ultrasonic signal for detection of echoes arising from particular interfaces masked by the response of the transducer. The work presented here addresses the use of this technique for resolution enhancement in imaging situations and in mapping...

Topics: ELECTRON MOBILITY, DEOXYRIBONUCLEIC ACID, S MATRIX THEORY, LASER BEAMS, ENERGY TRANSFER, ELECTRONS,...

The general process in lasers is defined in the photon number representation d rho(sub n)/dt = mu(sub 0)(u - mu(sub 1) u(exp 2) + mu(sub 2) u(exp 2) + mu(sub 3) u(exp 3)...)rho(sub n), where u is the matrix change operation u rho(sub n) = rho(sub n - 1) - rho(sub n), and mu(sub 1), mu(sub 2),...are the coefficients. In the same way as previous papers, we deduced the generating function G(sub 0)(z,t).

Topics: NASA Technical Reports Server (NTRS), LASERS, PHOTONS, MATRICES (MATHEMATICS), COEFFICIENTS,...

Method provides approach to automatic node relabeling that is consistent with requirements of wavefront concept. Specific applications are in analysis of aircraft, building structures, radar and surveillance structures, bridges, etc., or any other structure that is studied with aid of large and complex analytical model. Minimum growth sequencing is effective, rapid, and capable of producing economies.

Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, MATRICES (MATHEMATICS), NODES (STANDING...

The computation of divergence is studied. Covariance matrices to be analyzed admit a common diagonalization, or even triangulation. Sufficient conditions are given for such phenomena to take place, the arguments cover both real and complex matrices, and are not restricted to Hermotian or other special forms. Specifically, it is shown to be sufficient that the matrices in question commute in order to admit a common triangulation. Several results hold in the case that the matrices in question...

Topics: NASA Technical Reports Server (NTRS), JORDAN FORM, MATRICES (MATHEMATICS), HERMITIAN POLYNOMIAL,...

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269

Jul 11, 2010
07/10

by
Seldon, R. L

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No Abstract Available

Topics: INERTIAL PLATFORMS, MATRICES (MATHEMATICS), TRANSFORMATIONS (MATHEMATICS), AIRBORNE/SPACEBORNE...

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217

May 23, 2011
05/11

by
Gudimetla, V. S. Ra

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An effort was initiated last year in the Astrionics Laboratory at Marshall Space Flight Center to examine and incorporate, if necessary, the effects of relativity in the design of space-based lidar systems. A space-based lidar system, named AEOLUS, is under development at Marshall Space Flight Center and it will be used to accurately measure atmospheric wind profiles. Effects of relativity were also observed in the performance of space-based systems, for example in case of global positioning...

Topics: QUANTUM THEORY, SIGNAL DETECTION, ERROR ANALYSIS, PROBABILITY THEORY, MATRICES (MATHEMATICS),...

Two proofs are presented of an inequality due to Bergstrom.

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *INEQUALITIES, *MATRICES(MATHEMATICS), MATHEMATICAL...

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819

Jul 6, 2010
07/10

by
Jessee, R. D

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This report covers the design and development of the laboratory model, and is essentially a compilation of reports covering the system and its various parts. To enhance completeness, the final report of Phase 1 covering circuit development of the controller is also included. A controller was developed for a brushless, direct-drive, single axis solar array reorientation system for earth-pointed, passively-stabilized spacecraft. A control systems was designed and breadboard circuits were built...

Topics: DIFFERENTIAL EQUATIONS, LIAPUNOV FUNCTIONS, LINEAR EQUATIONS, PROBLEM SOLVING, MATRICES...

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366

Jul 11, 2010
07/10

by
NON

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The total matrix of alternate Spacelab processing concepts and the rejection rationale utilized to reduce the matrix of 243 alternates to the final candidate processing concepts are developed. The work breakdown structure used for the systematic estimation and compilation of integration and checkout resources is presented along with descriptors of each element. Program models are provided of the space transportation system, the Spacelab, the orbiter, and the ATL that were used as the basis for...

Topics: FREE ATMOSPHERE, GRAVIMETRY, GRAVITY ANOMALIES, BLOCK DIAGRAMS, COVARIANCE, DATA ACQUISITION,...

1,998
2.0K

Sep 20, 2010
09/10

by
NON

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The Office of Exploration (OEXP) at NASA Headquarters was tasked with defining and recommending alternatives for an early 1990's national decision on a focused program of human exploration of the solar system. The Mission Analysis and System Engineering (MASE) group, which is managed by the Exploration Studies Office at JSC, is responsible for coordinating the technical studies necessary for accomplishing such a task. This technical report, produced by the MASE, describes the process that was...

Topics: ALGORITHMS, VARIABILITY, CALIBRATING, COMPUTER PROGRAMS, ENERGY SPECTRA, GAMMA RAY BURSTS, SPECTRUM...

Most standard approaches to the static analysis of programs, such as the popular worklist method, are first-order methods that inductively annotate program points with abstract values. In this paper we introduce a second-order approach based on Kleene algebra. In this approach, the primary objects of interest are not the abstract data values, but the transfer functions that manipulate them. These elements form a left-handed Kleene algebra. The dataflow labeling is not achieved by inductively...

Topics: DTIC Archive, Kot,Lucja, Cornell University Ithaca, ALGEBRA, MATRICES MATHEMATICS, ALGORITHMS

The fast matrix multiplication algorithm by Strassen is used to obtain the triangular factorization of a permutation of any non-singular matrix of order n in (C sub 1)(n sup(log of 7 to the base 2)) operations, and hence the inverse of any non-singular matrix in (C sub 2)(n sup (log of 7 to the base 2)) operations.

Topics: DTIC Archive, Bunch, James R, CORNELL UNIV ITHACA NY, *MATRICES(MATHEMATICS), ALGORITHMS, NUMERICAL...

Topics: DTIC Archive, MOSER, JURGEN, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *DIFFERENTIAL...

Topics: DTIC Archive, MARSAGLIA, GEORGE, BOEING SCIENTIFIC RESEARCH LABS SEATTLE WA, *STATISTICAL ANALYSIS,...

Topics: DTIC Archive, Anderson, T W, COLUMBIA UNIV NEW YORK, *MATRICES(MATHEMATICS), STATISTICAL ANALYSIS,...

A generalization of the von Neumann and Morgenstern theory of utility, by omission of the Archimedean postulate, and an extension to the infinite dimensional case are given.

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *GAME THEORY, CONVEX SETS, MATHEMATICAL ANALYSIS,...

In his paper 'On the Structure of Linear Models' Solow makes extensive use of some results about the characteristic roots of indecomposable nonnegative matrices which are due to Frobenius. A recent paper by Helmut Wielandt gives a drastically simplified proof of these results of Frobenius; moreover, in several places the results are sharpened. One of the purposes of writing this note is to bring this paper and its translation into English by Herstein to the attention of economists. Debreu and...

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *ECONOMICS, *MATHEMATICAL MODELS, LINEAR SYSTEMS,...

The application of linear programming to complex problems gives rise to the handling of large matrix problems. The simplex method proved to be the most expedient of any tried but, since this is essentially Gaussian elimination, numerical techniques for handling it have definite limitations, both with regard to running time and memory size. RAND's simplex codes for the IBM 701 were designed, through revisions to the method and special compiling routines, to maintain great precision and...

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *COMPUTER PROGRAMMING, *LINEAR PROGRAMMING, COMPUTERS,...

This is an expository paper that discusses the notions of widths and heights of (0, 1)-matrices (previously introduced by the authors), in the general setting of known results concerning traces and term ranks. Proofs are omitted throughout.

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *COMBINATORIAL ANALYSIS, *MATRICES(MATHEMATICS), GAME...

Topics: DTIC Archive, MANN, H B, BOEING SCIENTIFIC RESEARCH LABS SEATTLE WA, *MATRICES(MATHEMATICS),...