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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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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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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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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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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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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)

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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...

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,...

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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...

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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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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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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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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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321

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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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),...

453
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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184

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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248

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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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394

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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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

The PI and collaborators developed novel algorithms for positioning, building on earlier developments in matrix completion and high-dimensional statistics. In particular, a distributed version of matrix completion-based positioning, and a gossip version of low-rank approximation were developed. A convex relaxation for positioning in the presence of noise was shown to be constant-optimal. Additional contributions were made in several other areas: Finding dense substructures of large networks in...

Topics: DTIC Archive, STANFORD UNIV CA, *MATRICES(MATHEMATICS), ALGORITHMS, DETECTORS, NODES, OPTIMIZATION,...

The inverses of r-banded matrices, for r = 1, 2, 3 have been thoroughly investigated as one can see from the references we provide. Let Br,n (1 less than or equal to r less than or equal to n) be an n x n matrix of entries {ai sub j}, -r less than or equal to r, 1 less than or equal to j less than or equal to r, with the remaining un-indexed entries all zeros. In this paper generalizing a method of Mallik (1999) [5], we give the LU factorization and the inverse of the matrix Br,n (if it...

Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF APPLIED MATHEMATICS, *INVERSE PROBLEMS,...

Theorems and their proof are given for the solution of partial derivatives for various scaler functions of matrices.

Topics: NASA Technical Reports Server (NTRS), MATRICES (MATHEMATICS), SCALERS, THEOREMS, EIGENVALUES,...

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199

Jul 11, 2010
07/10

by
Anderson, J. R.; Witmer, R. E

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The Land Use Data and Analysis (LUDA) Program which provides a systematic and comprehensive collection and analysis of land use and land cover data on a nationwide basis is described. Maps are compiled at about 1:125,000 scale showing present land use/cover at Level II of a land use/cover classification system developed by the U.S. Geological Survey in conjunction with other Federal and state agencies and other users. For each of the land use/cover maps produced at 1:125,000 scale, overlays are...

Topics: COMPUTER GRAPHICS, FINITE ELEMENT METHOD, MATRICES (MATHEMATICS), NODES (STANDING WAVES), NUMERICAL...

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289

May 29, 2011
05/11

by
Hueter, Uw

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NASA's Office of Aeronautics and Space Transportation Technology (OASTT) established the following three major goals, referred to as ''The Three Pillars for Success'': Global Civil Aviation, Revolutionary Technology Leaps, and Access to Space. The Advanced Space Transportation Program Office (ASTP) at the NASA's Marshall Space Flight Center in Huntsville, Ala. focuses on future space transportation technologies under the ''Access to Space'' pillar. The Propulsion Projects within ASTP under the...

Topics: ESTIMATING, QUATERNIONS, VECTOR ANALYSIS, ALGORITHMS, ATTITUDE (INCLINATION), MATRICES...

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216

Jul 6, 2010
07/10

by
Conn, A. F.; Rudy, S. L

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An investigation pertaining to the development of life prediction methods for materials subjected to high temperature creep/fatigue conditions is presented. High frequency (13.4 kHz) fatigue data were measured at 1400 F on specimens of the nickel-based alloy Udimet 700. Tests were conducted on the virgin material, as well as on specimens which had received prior exposures to high temperature, fatigue, and creep.

Topics: CANONICAL FORMS, DIFFERENTIAL EQUATIONS, LINEARITY, MATRICES (MATHEMATICS), EIGENVALUES, OPERATORS...

The present paper gives an algorithm that finds simultaneously the shortest paths between many pairs of nodes in a given network. In the book by Berge, the values of shortest paths between many pairs of nodes are found. Here, use is made of a special matrix multiplication technique to find the actual arcs that are used to form the shortest paths. In a network with n nodes, log sub 2 (n-1) special matrix multiplications are needed to find all the shortest paths. The present paper also gives an...

Topics: DTIC Archive, CALIFORNIA UNIV BERKELEY OPERATIONS RESEARCH CENTER, *OPERATIONS RESEARCH, LINEAR...

The second method used by Lyapunov to study the stability of the trivial solution of dx/dt = Ax + f (x) leads to the problem of solving the matrix equation AX + XA' = C. It is shown that this question is related to Kronecker products and Kronecker sums, and the general problem of solving AX + XB = C is resolved in this fashion.

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

Topics: DTIC Archive, ARROW, KENNETH J, STANFORD UNIV CA, *ECONOMICS, MATHEMATICAL ANALYSIS,...

During this three-year project, Vavasis and Wolkowicz, together with students, postdocs, and colleagues, made a number of advances in the convex optimization and its application to data mining and sensor localization. In this report we highlight some of these accomplishments.

Topics: DTIC Archive, WATERLOO UNIV (ONTARIO), *CONVEX SETS, DATA MINING, GEOMETRY, MATRICES(MATHEMATICS),...

Topics: DTIC Archive, Anderson, James L., MARYLAND UNIV BALTIMORE DENTAL SCHOOL, *QUANTUM THEORY,...

Some of the basic concepts are unified that were developed for the problem of finding optimal approximating functions which relate a set of controlled variables to a measurable response. The techniques have the potential for reducing the amount of testing required in experimental investigations. Specifically, two low-order polynomial models are considered as approximations to unknown functionships. For each model, optimal means of designing experimental tests are presented which, for a modest...

Topics: NASA Technical Reports Server (NTRS), APPROXIMATION, EXPERIMENT DESIGN, OPTIMIZATION, CURVE...

The objective of this paper is to describe a new method for identification of a continuous-time multi-input and multi-output bilinear system. The approach is to make judicious use of the linear-model properties of the bilinear system when subjected to a constant input. Two steps are required in the identification process. The first step is to use a set of pulse responses resulting from a constant input of one sample period to identify the state matrix, the output matrix, and the direct...

Topics: NASA Technical Reports Server (NTRS), SYSTEM IDENTIFICATION, MATRICES (MATHEMATICS), COEFFICIENTS,...

In this paper we investigate the spectra and related questions for various combinatorial matrices, generalizing work by Carlitz, Cooper and Kennedy.

Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF APPLIED MATHEMATICS,...

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242

Jul 26, 2010
07/10

by
Gertel, Maurice; Holland, Richar

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No Abstract Available

Topics: ALGORITHMS, LINEAR EQUATIONS, MATRICES (MATHEMATICS), MATRIX THEORY, VECTORS (MATHEMATICS),...

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191

Sep 20, 2010
09/10

by
Sandel, Bill R.; Herbert, F.; Yelle, R. V

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We propose to continue our investigation of the upper atmosphere of Neptune based primarily on the solar occultation measurements made by the Voyager Ultraviolet Spectrometer (UVS). The ultimate goal of this research is to understand the structure and composition of Neptune's upper atmosphere as encoded in the data base obtained by the UVS during the Voyager 2 encounter with Neptune. The UVS occultations provide information essential to studies of atmospheric composition and structure, energy...

Topics: FLIGHT SIMULATION, INFORMATION THEORY, MAN MACHINE SYSTEMS, PILOT PERFORMANCE, MATHEMATICAL MODELS,...

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233

Jun 13, 2011
06/11

by
Morse, Jon A.; Smith, Nathan; Blair, William P.; Kirshner, Robert P.; Winkler, P. Frank; Hughes, John P

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Hubble Space Telescope images with the Wide Field Planetary Camera 2 of the young, oxygen-rich, Crab-like supernova remnant SNR0540-69.3 in the Large Magellanic Cloud (LMC) reveal details of the emission distribution and the relationship between the expanding ejecta and synchrotron nebula. The emission distributions appear very similar to those seen in the Crab nebula, with the ejecta located in a thin envelope surrounding the synchrotron nebula. The [O III] emission is more extended than other...

Topics: LIFE SUPPORT SYSTEMS, AUTOMATIC CONTROL, SYSTEMS ENGINEERING, NUMERICAL INTEGRATION, AUTONOMY,...

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251

Jun 21, 2010
06/10

by
Reed, R. E., Jr.; Wilcox, P. R

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Stress concentration due to hyperboloid cavity in thin plate

Topics: CHEBYSHEV APPROXIMATION, EXPONENTIAL FUNCTIONS, LINEAR SYSTEMS, MATRICES (MATHEMATICS),...

For over one hundred years, the eigenvalue problem has been investigated by mathematicians, physicists, and engineers. Scientists explored the characterization, location, perturbation and computation of eigenvalues, to name a few topics. This thesis is devoted to the separation of eigenvalues. We will find the minimum gap between eigenvalues over an interesting class of tridiagonal matrices. We consider unreduced n x n symmetric tridiagonal matrices with all subdiagonal entries.

Topics: DTIC Archive, Parlett, Beresford, CALIFORNIA UNIV BERKELEY DEPT OF MATHEMATICS, *EIGENVALUES,...

Topics: DTIC Archive, Greville,T N E, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *MATRIX THEORY,...

Topics: DTIC Archive, GALE, D, BROWN UNIV PROVIDENCE RI, *MATHEMATICAL LOGIC, *MATHEMATICS, *SOCIOLOGY,...

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289

May 22, 2011
05/11

by
Ruyten, Wilhelmus M.; Friedly, Verlin J.; Peng, Xiaohang; Keefer, Denni

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Experimental facilities for electric propulsion testing at the University of Tennessee Space Institute, jointly operated by the Center for Advanced Space Propulsion, include a cryogenically cooled, computer-controlled, 9 ft diameter by 20 ft long vacuum chamber, capable of maintaining a baseline pressure of 10(exp -7) Torr, a 30 cm diameter ion thruster, and laser diagnostic and electrical diagnostic instrumentation. These facilities are described here in some detail, with emphasis on the...

Topics: CODES, COMPUTER PROGRAMMING, CONVOLUTION INTEGRALS, SIGNAL ENCODING, TRELLIS CODING, VITERBI...

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Jul 11, 2010
07/10

by
NON

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This two volume publication presents the proceedings of the third through sixth history symposia of the International Academy of Astronautics. Thirty-nine papers are divided into four categories: (1) Early Solid Propellant Rocketry; (2) Rocketry and Astronautics: Concepts, Theory, and Analyses after 1880; (3) The Development of Liquid and Solid Propellant Rockets from 1880 to 1945; and (4) Rocketry and Astronautics after 1945. Categories 1 and 2 will be found in volume 1 and the remainder in...

Topics: ALGORITHMS, LEAST SQUARES METHOD, MATRICES (MATHEMATICS), MATHEMATICAL MODELS, ORTHOGONAL...

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597

Jul 6, 2010
07/10

by
Deloatch, E. M

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The five problems studied for biomedical applications of NASA technology are reported. The studies reported are: design modification of electrophoretic equipment, operating room environment control, hematological viscometry, handling system for iridium, and indirect blood pressure measuring device.

Topics: DIFFERENTIAL EQUATIONS, LINEAR SYSTEMS, OSCILLATIONS, EIGENVALUES, LEBESGUE THEOREM, MATRICES...

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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...

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...