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50

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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135

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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42

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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400

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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142

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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57

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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392

Jul 11, 2010
07/10

by
NON

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No Abstract Available

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

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196

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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247

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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

183
183

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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235

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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195

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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319

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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374

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...

5
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...

168
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,...

186
186

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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642

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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201

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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215

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)

2,537
2.5K

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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453

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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239

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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101

May 31, 2011
05/11

by
NON

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West Coast Netting, Inc.'s net of Hyperester twine, is made of three strands of fiber twisted together by a company-invented sophisticated twisting machine and process that maintain precisely the same tension on each strand. The resulting twine offers higher strength and improved abrasion resistance. The technology that created the Hyperester supertwine has found spinoff applications, first as an extra-efficient seine for tuna fishing, then as a capture net for law enforcement agencies. The...

Topics: STUDENTS, COORDINATES, MAGNETIC PERMEABILITY, TENSOR ANALYSIS, PHYSICS, ANALYSIS (MATHEMATICS),...

840
840

Jun 21, 2010
06/10

by
Henry, R. E

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Compressible flow of two component, two phase mixtures in nozzles and orifices

Topics: BOUNDARY VALUE PROBLEMS, NEWTON METHODS, NEWTON THEORY, NONLINEAR EQUATIONS, DIFFERENTIAL...

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232

Jun 27, 2010
06/10

by
Zaehringer, J

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Chemical composition of lunar samples from Apollo 11 and 12 flights

Topics: HERMITIAN POLYNOMIAL, ILLUMINATING, IMAGING TECHNIQUES, LUMINOUS INTENSITY, MATRICES (MATHEMATICS),...

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247

Jul 12, 2010
07/10

by
Mccurdy, D. A

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A laboratory experiment was conducted to determine the effects of variations in the rate and magnitude of sound level fluctuations on the annoyance caused by aircraft-flyover noise. The effects of tonal content, noise duration, and sound pressure level on annoyance were also studied. An aircraft-noise synthesis system was used to synthesize 32 aircraft-flyover noise stimuli representing the factorial combinations of 2 tone conditions, 2 noise durations, 2 sound pressure levels, 2 level...

Topics: NASTRAN, STRUCTURAL ANALYSIS, SYSTEMS ANALYSIS, UNIVAC 1110 COMPUTER, COST ANALYSIS, DATA...

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785

Jul 26, 2010
07/10

by
Long, W. C

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The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis (FMEA) and Critical Items List (CIL) are presented. The IOA effort first completed and analysis of the Communication and Tracking hardware, generating draft failure modes and potential critical items. To preserve independence, this analysis was accomplished without reliance upon the results contained within the NASA FMEA/CIL documentation. The IOA results were then compared to the NASA FMEA/CIL...

Topics: ALGORITHMS, WEIGHTING FUNCTIONS, ANTENNA ARRAYS, ANTENNAS, RADIO FREQUENCY INTERFERENCE, SIGNAL...

It is shown that the minimal number of interchanges necessary to transform one (0,1)-matrix into another equivalent one may be computed from the maximal number of edge-disjoint circuits in a bipartite graph derived from the difference of the matrices. This partially answers a question raised by Ryser. Two (0,1)-matrices are said to be equivalent if their difference has zero row and column sums. They are said to differ by an interchange if they are equivalent and their difference is zero except...

Topics: DTIC Archive, Walkup, David W, BOEING SCIENTIFIC RESEARCH LABS SEATTLE WA, *MATRICES(MATHEMATICS),...

This paper determines the nonnegativity of the principal components of an n x n nonnegative matrix P in terms of the marked reduced graph R(A) of A = P - rho(P)I, the minus M matrix which can be associated with P. We then apply this result to consider various types of nonnegative bases for the Perron eigenspace of P which can be extracted from a certain nonnegative matrix which is a polynomial in P. We also obtain a characterization for the eigenprojection on the Perron eigenspace of P to be,...

Topics: DTIC Archive, Neumann, Michael, WISCONSIN UNIV-MADISON CENTER FOR MATHEMATICAL SCIENCES,...

Let A be an m by n (0, 1)-matrix, and suppose that E* is an m by epsilon submatrix of A having the property that each row of E* contains at least alpha 1's. The epsilon columns of E* are said to form an alpha-set of representatives for A. Let epsilon(alpha) be the minimal number of columns of A that form an alpha-set of representatives. The integer epsilon(alpha) is called the alpha-width of A. If A has alpha-width epsilon(alpha), select an m by epsilon(alpha) submatrix E* of A having the...

Topics: DTIC Archive, FULKERSON, D R, RAND CORP SANTA MONICA CA, *MATRICES(MATHEMATICS), *COMBINATORIAL...

The paper presents the results and the method of analysis for an attack-defense game involving allocation of resources. Each player is assumed to have several different types of resources to be divided in an optimal fashion among a fixed set of targets. The payoff function of the game is convex. The 'No Soft-Spot' principle of M. Dresher, (Games of Strategy: Theory and Applications', Prentice-Hall, Englewood Cliffs, New Jersey, 1961). The results quoted are slightly less general than those...

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

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321

Jun 21, 2010
06/10

by
Hunter, W. W., Jr

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Laboratory measurements of rotational temperatures in static low density air with electron beam probe

Topics: LINEARITY, OPTIMAL CONTROL, TRAJECTORY OPTIMIZATION, CONSTRAINTS, HAMILTONIAN FUNCTIONS, LINEAR...

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266

Jul 23, 2010
07/10

by
Lyle, Karen H.; Leatherwood, Jack D.; Daniels, Edward F

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The accuracy of classical linear theory for predicting acceleration and strain for cantilevered and Clamped-Free-Clamped-Free (C-F-C-F) panels excited through the base is studied. Aluminum, steel and titanium plates of various dimensions and thicknessess were vibration tested, using a broadband random signal applied through a shaker mounting fixture. The strains were measured at 9 locations on the cantilevered panels and at 5 locations on the C-F-C-F panels. Predictions were based on the Ritz...

Topics: ADAPTIVE CONTROL, PHASES, EXCITATION, LINEAR SYSTEMS, ROBUSTNESS (MATHEMATICS), ALGORITHMS,...

Topics: DTIC Archive, Holden, Richard M, EMMANUEL COLL BOSTON MA RESEARCH LANGUAGE CENTER,...

Topics: DTIC Archive, Bisshopp, F E, BOEING SCIENTIFIC RESEARCH LABS SEATTLE WA, *MATRICES(MATHEMATICS),...

The study of alpha-widths of (0, 1)-matrices (AD-274 181) continued, the emphasis being on those special classes of b by v (0, 1)-matrices having k 1's per row and 4 1's per column. It is assumed throughout that the class parameters b, v, k, r satisfy the inequality (b-r)(v-k-1) less than or equal to v - 1. Such a class has special combinatorial interest. For example, complements of finite projective planes and of Steiner triple systems have parameters satisfying this inequality. Several...

Topics: DTIC Archive, FULKERSON, D R, RAND CORP SANTA MONICA CA, *COMBINATORIAL ANALYSIS,...

In this thesis we focus on the problem of entanglement in an important class of states, called X-states, that we will introduce. Our study led us to an algebraic formula for the value of multipartite entanglement for X-states. We will take advantage of this formula to further explore the connection of entanglement and mixedness in multipartite systems and study the dynamics of entanglement in open systems. We introduce the entanglement, its definition, and the properties of good measures of...

Topics: DTIC Archive, ROCHESTER UNIV NY, *MATRICES(MATHEMATICS), ALGEBRA, DYNAMICS, FORMULATIONS, FOULING,...

Suppose that A is a square matrix consisting of nonnegative elements. In certain considerations it is important to know when all the elements of some power of A are strictly positive. Frobenius gave a very simple necessary and sufficient condition for this to happen. In this paper a simple proof of this result is given. This proof is algebraic in nature and avoids the use of the convergence of powers of a matrix.

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

291
291

Jun 21, 2010
06/10

by
Shapiro, Ya. M

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Weightlessness and artificial gravity simulation

Topics: DIFFERENTIAL EQUATIONS, GAME THEORY, LINEAR EQUATIONS, VECTOR ANALYSIS, CONVEXITY, MATRICES...

IF A LINEAR PROGRAMMING PROBLEM (written in inequality form) has a solution, then either the primal constraint set or the dual constraint set is unbounded. The parenthetical remark is our addition to he statement of the theorem, but is implicitly assumed. The inequality form of the general linear programming problem is s metimes referred to as the canonical form and used as a standard point of departure for further analyses. Yet some care may be needed, as is true here, ifA FULL DEGREE OF...

Topics: DTIC Archive, CHARNES, A, NORTHWESTERN UNIV EVANSTON IL TECHNOLOGICAL INST, *LINEAR PROGRAMMING,...

Topics: DTIC Archive, ORCHARD-HAYS, WILLIAM, RAND CORP SANTA MONICA CA, *LINEAR PROGRAMMING, *SCHEDULING,...

This paper considers the question of the numerical inversion of the Mellin transform. This transform also plays an important role in the study of functional equations of the type that arise in mathematical physics. (Author)

Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *EQUATIONS, *INTEGRAL TRANSFORMS, MATRICES(MATHEMATICS),...

A complete classification is given of all (22,11) and (24,12) self- dual codes. For each code the authors give the order of its group, the number of codes equivalent to it, and its weight distribution. There is a unique (24, 12,6) self-dual code. Several theorems on the enumeration of self-orthogonal codes are used, including formulas for the number of such codes with minimum distance or = 4, and for the sum of the weight enumerators of all self-dual codes.

Topics: DTIC Archive, Pless, Vera, MASSACHUSETTS INST OF TECH CAMBRIDGE PROJECT MAC, *CODING,...

197
197

Jun 21, 2010
06/10

by
Kreyndel, Yu. YE., et al

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Efficient electron extraction from plasmas in vacuum

Topics: AERODYNAMIC COEFFICIENTS, TABS (CONTROL SURFACES), UNSTEADY FLOW, MATHEMATICAL MODELS, MATRICES...

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146

Jul 5, 2010
07/10

by
Beatty, M. E., II

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The effects of 22-MeV protons on various types of silicon single junction and silicon controlled rectifiers were investigated. The results show that low-leakage devices and silicon controlled rectifiers are the most susceptable to radiation damage. There are also differences noted between single junction rectifiers of the same type made by different manufacturers, which emphasizes the need for better selection of devices used in spacecraft.

Topics: ALGORITHMS, TRAJECTORY MEASUREMENT, MATRICES (MATHEMATICS), OPTIMIZATION, PARAMETERIZATION, RANDOM...

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Jul 21, 2010
07/10

by
Hayashi, M.; Sakurai, A.; Aso, S

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A thin film heat transfer gauge is applied to the measurement of heat transfer coefficients in the interaction regions of incident shock waves and fully developed turbulent boundary layers. It was developed to measure heat flux with high spatial resolution and fast response for wind tunnels with long flow duration. To measure the heat transfer coefficients in the interaction region in detail, experiments were performed under the conditions of Mach number = 4, total pressure = 1.2 MPa, 0.59 to...

Topics: ANNIHILATION REACTIONS, ELASTIC SCATTERING, NUCLEON-NUCLEON INTERACTIONS, HOLES (ELECTRON...

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199

Jul 26, 2010
07/10

by
Maestrello, Lucio; Bayliss, A.; Krishnan, R

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The behavior of spatially growing three-dimensional waves in a supersonic boundary layer was studied numerically by solving the complete Navier-Stokes equations. Satisfactory comparison with linear parallel and non-parallel stability theories, and experiment are obtained when a small amplitude inflow disturbance is used. The three-dimensional unsteady Navier-Stokes equations are solved by a finite difference method which is fourth-order and second-order accurate in the convection and viscous...

Topics: ARCHITECTURE (COMPUTERS), CODING, HAMILTONIAN FUNCTIONS, MEMORY (COMPUTERS), NEURAL NETS,...

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271

May 30, 2011
05/11

by
Jules, Kenol; Lin, Paul P

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This paper presents an artificial intelligence monitoring system developed by the NASA Glenn Principal Investigator Microgravity Services project to help the principal investigator teams identify the primary vibratory disturbance sources that are active, at any moment in time, on-board the International Space Station, which might impact the microgravity environment their experiments are exposed to. From the Principal Investigator Microgravity Services' web site, the principal investigator teams...

Topics: ELECTRON SCATTERING, SCATTERING FUNCTIONS, HYDROGEN, SCATTERING CROSS SECTIONS, MATRICES...