503
503

Jul 5, 2010
07/10

by
Vasin, V. A., et al

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No Abstract Available

Topics: RELATIVITY, SPACE-TIME FUNCTIONS, SYMMETRY, GEODESY, SCHWARZSCHILD METRIC

203
203

May 23, 2011
05/11

by
Derrickson, J. H.; Eby, P. B.; Moon, K. H.; Parnell, T. A.; King, D. T.; Gregory, J. C.; Takahashi, Y.; Ogata, T

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Measurements of direct Coulomb electron-positron pair production have been made on the tracks of relativistic heavy ions in nuclear track emulsion. Tracks of 0(16) and S(32) at 200 GeV/nucleon were studied. The measured total cross sections and energy and emission angle distributions for the pair members are compared to theoretical predictions. The data are consistent with some recent calculations when knock-on electron contamination is accounted for.

Topics: SPEED INDICATORS, TIME SERIES ANALYSIS, TIME FUNCTIONS, DECISION THEORY

15
15

Jul 22, 2021
07/21

by
Adams, Steve, 1957-

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273 p., [8] p. of plates : 23 cm

Topics: Relativity (Physics), Space and time, RELATIVITY, SPACE-TIME FUNCTIONS, TEXTBOOKS

452
452

Jun 27, 2010
06/10

by
Libove, C.; Lin, C.-J

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Mathematical model for elastic shear bending of trapezoidally corrugated plate with trough lines held straight including stiffness and stress analysis

Topics: ECHOES, RELATIVISTIC EFFECTS, TIME FUNCTIONS, ELECTRON DISTRIBUTION, KINETIC EQUATIONS, OSCILLATIONS

16
16

Dec 14, 2021
12/21

by
Sklar, Lawrence

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xii, 423 pages 24 cm

Topics: Raum, .., Space and time, Zeit, Ruimte-tijd-theorie, SPACE-TIME FUNCTIONS, Raum

27
27

Oct 25, 2021
10/21

by
Sklar, Lawrence

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xii, 423 pages 24 cm

Topics: Raum, .., Space and time, Zeit, Ruimte-tijd-theorie, SPACE-TIME FUNCTIONS, Raum

333
333

Jun 1, 2011
06/11

by
Acker, Loren W.; Kleinknecht, Kenneth S

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As part of a program requested by the Bureau of Aeronautics, Navy Department, flight and ground investigations have been made on an exhaust-ejector installation in a twin-engine airplane. The exhaust ejectors were designed to increase the cooling-air flow through the engine and were installed in the left nacelle. The right engine was left in its standard configuration with an exhaust collector ring. The cooling-air pressure drop across the engine and the cylinder temperatures were measured in...

Topics: COMPUTATIONAL GRIDS, SCHEDULING, TIME FUNCTIONS, PARALLEL COMPUTERS, AIRBORNE/SPACEBORNE COMPUTERS,...

452
452

Sep 20, 2010
09/10

by
Obrien, Edward M

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The common mode rejection ratio (CMRR) of the single operational amplifier (op amp) differential amplifier and of the three operational amplifier differential amplifier was investigated. The three op amp differential amplifier circuit is used in the signal conditioner circuit which amplifies signals such as the electromyograph or electrocardiogram. The investigation confirmed via SPICE modeling what has been observed by others in the recent literature that the CMRR for the circuit can be...

Topics: EARTHQUAKES, GEOLOGICAL FAULTS, GEOPHYSICS, ITALY, JAPAN, LOW FREQUENCIES, SEISMIC WAVES, TIME...

174
174

Jul 23, 2010
07/10

by
Ozernoy, P. M

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No Abstract Available

Topics: COORDINATES, SPACE-TIME FUNCTIONS, THEORETICAL PHYSICS, TRANSFORMATIONS (MATHEMATICS), EINSTEIN...

327
327

Jun 21, 2010
06/10

by
Buyvol, V. N

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eye 327

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Propagation of sound waves radiated from surface of circular cylinder in perfect fluid

Topics: EXTRATERRESTRIAL LIFE, RELATIVITY, SPACECRAFT POWER SUPPLIES, INTERPLANETARY FLIGHT, PLANETARY...

349
349

Jun 2, 2011
06/11

by
Banks, Bruce A.; Karniotis, Christina A.; Dworak, David; Soucek, Mar

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The exposure of most silicones to atomic oxygen in low Earth orbit (LEO) results in the oxidative loss of methyl groups with a gradual conversion to oxides of silicon. Typically there is surface shrinkage of oxidized silicone protective coatings which leads to cracking of the partially oxidized brittle surface. Such cracks widen and branch crack with continued atomic oxygen exposure ultimately allowing atomic oxygen to reach any hydrocarbon polymers under the silicone coating. A need exists for...

Topics: DIGITAL SYSTEMS, DESIGN ANALYSIS, SYNCHRONISM, TIME FUNCTIONS, SYSTEMS ENGINEERING, CLOCKS,...

1,576
1.6K

Jul 21, 2010
07/10

by
Iya, S. K

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It was recognized that the traditional hot rod type deposition process for decomposing silane is energy intensive, and a different approach for converting silane to silicon was chosen. A 1200 metric tons/year capacity commercial plant was constructed in Moses Lake, Washington. A fluidized bed processor was chosen as the most promising technology and several encouraging test runs were conducted. This technology continues to be very promising in producing low cost polysilicon. The Union Carbide...

Topics: APPROXIMATION, DIMENSIONAL ANALYSIS, FEEDBACK CONTROL, LINEARITY, QUADRATIC EQUATIONS, GROUP...

1,082
1.1K

May 29, 2011
05/11

by
NON

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The High-Speed Research Program and NASA Langley Research Center sponsored the NASA High-Speed Research Program Aerodynamic Performance Workshop on February 25-28, 1997. The workshop was designed to bring together NASA and industry High-Speed Civil Transport (HSCT) Aerodynamic Performance technology development participants in area of Configuration Aerodynamics (transonic and supersonic cruise drag prediction and minimization), High-Lift, Flight Controls, Supersonic Laminar Flow Control, and...

Topics: DESIGN ANALYSIS, MODELS, DATA BASES, COSTS, CONFIGURATION MANAGEMENT, SPACE MISSIONS, RISK,...

59
59

Oct 15, 2021
10/21

by
Geroch, Robert

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xi, 225 pages : 21 cm

Topics: General relativity (Physics), RELATIVITY, SPACE-TIME FUNCTIONS, FIELD THEORY (PHYSICS), General...

302
302

Jun 13, 2011
06/11

by
Lindstrom, Gary; Mehlitz, Peter C.; Visser, Wille

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The Real Time Specification for Java (RTSJ) is an augmentation of Java for real time applications of various degrees of hardness. The central features of RTSJ are real time threads; user defined schedulers; asynchronous events, handlers, and control transfers; a priority inheritance based default scheduler; non-heap memory areas such as immortal and scoped, and non-heap real time threads whose execution is not impeded by garbage collection. The Robust Software Systems group at NASA Ames...

Topics: SPACE-TIME FUNCTIONS, FINITE DIFFERENCE THEORY, ELECTROMAGNETIC RADIATION, COSMOLOGY, BOUNDARY...

185
185

Jul 5, 2010
07/10

by
Alexandroff, P., et al

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No Abstract Available

Topics: DISTRIBUTION FUNCTIONS, SPACE-TIME FUNCTIONS, SPORADIC E LAYER, CRITICAL FREQUENCIES, GEOMAGNETIC...

240
240

Jun 21, 2010
06/10

by
Ilinsky, A. I.; Palatnik, L. S.; Ravlik, A. G

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Tensile strength and microhardness of iron and nickel films prepared by vacuum condensation

Topics: EQUATIONS OF MOTION, ORBITAL MECHANICS, THRUST, TRANSFER ORBITS, COORDINATES, CORRECTION,...

380
380

Jun 21, 2010
06/10

by
NON

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Digital transponder for sequential ranging, phase shift keyed/phase modulated communication system and combinatorial coding analysis

Topics: MAGNETIC EQUATOR, MAGNETIC STORMS, TABLES (DATA), DATA REDUCTION, EARTH MAGNETOSPHERE, TIME...

218
218

Jun 21, 2010
06/10

by
Sutliff, J. D

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Method for deployment of flexible wing glider from space vehicle with minimum impact and loading

Topics: NUCLEAR SCATTERING, SPACE-TIME FUNCTIONS, THREE BODY PROBLEM, TRANSITION POINTS, ELASTIC...

A 36 bit time code generator implemented in CMOS is described. A microprocessor is used to minimize chip count. A modified 20 second format is available as an option, by changing two program steps.

Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, MICROPROCESSORS, MICROPROGRAMMING,...

Specialized programs for an uses or RXTE data to achieve the purposes of this study were developed with the support from this contract. These programs have been employed in the analysis and publication of an RXTE observation of 4U 1538-52 that revealed a surprisingly large eccentricity of the orbit and evidence of orbital decay ("The orbit of the binary X-ray purser 4U 1538-52 from ROSSI X-RAY TIMING EXPLORER observations", G. W. Clark 2000, ApJ 542, L133). Meanwhile two studies of...

Topics: NASA Technical Reports Server (NTRS), SPECTRA, TIME FUNCTIONS, X RAY TIMING EXPLORER, DATA...

211
211

Jun 18, 2010
06/10

by
Steinbrecher, D. H

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Analog circuit for determining ratio and product of two time functions

Topics: ANALOG CIRCUITS, NOISE METERS, RATIOMETERS, RC CIRCUITS, TIME FUNCTIONS, CIRCUIT, NOISE METER, RC...

2,944
2.9K

Jul 25, 2010
07/10

by
NON

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This bibliography lists 466 reports, articles, and other documents introduced into the NASA scientific and technical information system in July, 1989. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics.

Topics: ALGORITHMS, COMPUTER SYSTEMS DESIGN, MULTIPROCESSING (COMPUTERS), SCHEDULING, TIME FUNCTIONS, ERROR...

Tables covering provisional hourly values of equatorial Dst for November and December 1972 are presented.

Topics: NASA Technical Reports Server (NTRS), MAGNETIC VARIATIONS, TABLES (DATA), PERIODIC VARIATIONS, TIME...

204
204

Jun 2, 2011
06/11

by
Strong, A. W.; Moskalenko, I. V.; Reimer, O.; Diehl, S.; Diehl, R

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We present a solution to the apparent discrepancy between the radial gradient in the diffuse Galactic gamma-ray emissivity and the distribution of supernova remnants, believed to be the sources of cosmic rays. Recent determinations of the pulsar distribution have made the discrepancy even more apparent. The problem is shown to be plausibly solved by a variation in the Wco-to-N(H2) scaling factor. If this factor increases by a factor of 5-10 from the inner to the outer Galaxy, as expected from...

Topics: WIND TUNNEL TESTS, TIME FUNCTIONS, ROTARY WINGS, PRESSURE SENSITIVE PAINTS, PRESSURE MEASUREMENT,...

214
214

Jul 5, 2010
07/10

by
Bunner, A. N

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A review of X-ray observations in the vicinity of the Gum nebula is presented. There is little doubt that the filamentary nebula Stromlo 16, the radio source Vela X, and the extended X-ray object Vel XR-2 are indications of the same, relatively nearby, supernova remnant. X-ray absorption measurements are consistent with a distance of 500 or - 100 pc. The observed X-ray spectra have not yet distinguished between thermal bremsstrahlung and synchrotron radiation as the source mechanism. A search...

Topics: ELECTRIC CONTACTS, SOLAR CELLS, STORAGE STABILITY, TEMPERATURE EFFECTS, ELECTRICAL PROPERTIES,...

No abstract available

Topics: NASA Technical Reports Server (NTRS), SPACE-TIME FUNCTIONS, INTERSTELLAR TRAVEL, HYPERSONIC SPEED,...

The problem of analysis and interpretation of the waveform related data from the radar altimeter experiment is presented. The computer programs developed or modified for the realignment processes are briefly discussed.

Topics: NASA Technical Reports Server (NTRS), SKYLAB PROGRAM, SYSTEMS ENGINEERING, ALTIMETERS, COMPUTER...

The presentation centers on four classes of systems that can be treated as linear systems over a ring. These are: (1) discrete-time systems over a ring of scalars such as the integers; (2) continuous-time systems containing time delays; (3) large-scale discrete-time systems; and (4) time-varying discrete-time systems.

Topics: NASA Technical Reports Server (NTRS), ALGEBRA, LINEAR SYSTEMS, RINGS (MATHEMATICS), DISCRETE...

We used speed discrimination tasks to measure the ability of observers to combine speed information from multiple stimuli distributed across space. We compared speed discrimination thresholds in a classical discrimination paradigm to those in an uncertainty/search paradigm. Thresholds were measured using a temporal two-interval forced-choice design. In the discrimination paradigm, the n gratings in each interval all moved at the same speed and observers were asked to choose the interval with...

Topics: NASA Technical Reports Server (NTRS), SPEED INDICATORS, TIME SERIES ANALYSIS, TIME FUNCTIONS,...

The introduction of computational grids has resulted in several new problems in the area of scheduling that can be addressed using predictions. The first problem is selecting where to run an application on the many resources available in a grid. Our approach to help address this problem is to provide predictions of when an application would start to execute if submitted to specific scheduled computer systems. The second problem is gaining simultaneous access to multiple computer systems so that...

Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL GRIDS, SCHEDULING, TIME FUNCTIONS, PARALLEL...

368
368

Jul 12, 2010
07/10

by
Cunningham, H. J.; Desmarais, R. N

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A generalized subsonic unsteady aerodynamic kernel function, valid for both growing and decaying oscillatory motions, is developed and applied in a modified flutter analysis computer program to solve the boundaries of constant damping ratio as well as the flutter boundary. Rates of change of damping ratios with respect to dynamic pressure near flutter are substantially lower from the generalized-kernel-function calculations than from the conventional velocity-damping (V-g) calculation. A...

Topics: CANONICAL FORMS, STATISTICAL ANALYSIS, VELOCITY, KINEMATICS, PARTICLE TRAJECTORIES, QUANTUM...

A global survey of the low-frequency (1-21 mHz) source characteristics of large events are studied. We are particularly interested in events unusually enriched in low-frequency and in events with a short-term precursor. We model the source time function of 12 large earthquakes using teleseismic data at low frequency. For each event we retrieve the source amplitude spectrum in the frequency range between 1 and 21 mHz with the Silver and Jordan method and the phase-shift spectrum in the frequency...

Topics: NASA Technical Reports Server (NTRS), EARTHQUAKES, GEOLOGICAL FAULTS, GEOPHYSICS, ITALY, JAPAN, LOW...

Data for wind profile spectra changes with respect to time from Cape Kennedy, Florida for the time period from 28 November 1964 to 11 May 1967 have been analyzed. A universal statistical distribution of the spectral change which encompasses all vertical wave numbers, wind speed categories, and elapsed time has been developed for the standard deviation of the time changes of detailed wind profile spectra as a function of wave number.

Topics: NASA Technical Reports Server (NTRS), EARTH ATMOSPHERE, STOCHASTIC PROCESSES, WIND PROFILES,...

325
325

Jul 23, 2010
07/10

by
Nakanishi, Shige

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Information is given on the kind of protection that is needed against impact and perforation of a long-term cryogenic storage vessel in space by meteoroids and space debris. The long-term effects of the space environment on thermal control surfaces and coatings, and the question of whether the insulation and thermal control surfaces should be encased in a vacuum jacket shell are discussed.

Topics: COMPUTER PROGRAMS, SPACE-TIME FUNCTIONS, ELECTRIC DISCHARGES, LIGHTNING, REAL TIME OPERATION,...

The Bunch-Kaufman algorithm for factoring symmetric indefinite matrices was rejected for banded matrices because it destroys the banded structure of the matrix. Herein, it is shown that for a subclass of real symmetric matrices which arise in solving the generalized eigenvalue problem using Lanczos's method, the Bunch-Kaufman algorithm does not result in major destruction of the bandwidth. Space time complexities of the algorithm are given and used to show that the Bunch-Kaufman algorithm is a...

Topics: NASA Technical Reports Server (NTRS), FACTORIZATION, MATRICES (MATHEMATICS), SYMMETRY, ALGORITHMS,...

A timing and control strategy that can be used to realize synchronous systems with a level of performance that approaches that of asynchronous circuits or systems was developed in this work. This approach is based upon a single-phase synchronous circuit/system architecture with a variable period clock. The handshaking signals required for asynchronous self-timed circuits are not needed. Dynamic power supply current monitoring is used to generate the timing information, that is comparable to the...

Topics: NASA Technical Reports Server (NTRS), DIGITAL SYSTEMS, DESIGN ANALYSIS, SYNCHRONISM, TIME...

This report gives a synopsis of the activities of the CORE Operation Center from January 2003 to December 2003. The report forecasts activities planned for the year 2004.

Topics: NASA Technical Reports Server (NTRS), FORECASTING, SCHEDULING, ASTRONOMICAL OBSERVATORIES,...

An approach, is proposed for the design of approximate, fixed order, discrete time realizations of stochastic processes from the output covariance over a finite time interval, was proposed. No restrictive assumptions are imposed on the process; it can be nonstationary and lead to a high dimension realization. Classes of fixed order models are defined, having the joint covariance matrix of the combined vector of the outputs in the interval of definition greater or equal than the process...

Topics: NASA Technical Reports Server (NTRS), ERROR FUNCTIONS, MATHEMATICAL MODELS, RECURSIVE FUNCTIONS,...

The development of ultra stable optical fiber distribution systems for the dissemination of frequency and timing references is reported. The ultimate design goals for these systems are a frequency stability of 10 to the -17 power for tau or = 100 sec and time stability of + or - 0.1 ns for 1 year and operation over distances or = 30 km. A prototype system is reviewed and progress is discussed.

Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, FIBER OPTICS, FREQUENCY DISTRIBUTION, TIME...

477
477

Jun 20, 2010
06/10

by
Ash, G. R

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Mathematical statement and computer simulation of low thrust guidance problem - minimum time solutions

Topics: COMPUTERIZED SIMULATION, TIME FUNCTION, FORMULATIONS, GUIDANCE (MOTION), LOW THRUST, LOW THRUST...

458
458

May 29, 2011
05/11

by
Hodge, Andrew J.; Kaul, Raj K.; McMahon, William M.; Reinarts, Thoma

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The current Solid Rocket Booster (SRB) launch vehicle has several metal based components that require a Thermal Protective System (TPS) be applied to the exterior surface to ensure its structural integrity and to protect the interior hardware from aerodynamic heating. TPS materials have distinct disadvantages associated with their use. One disadvantage to the application of TPS is that it can act as a debris source to the Space Shuttle Orbiter during flight and it also adds weight to the system...

Topics: SHOCK WAVE INTERACTION, SHOCK WAVES, SPACE-TIME FUNCTIONS, CONSERVATION EQUATIONS, SHOCK TUBES,...

An algorithm is described that is based on the method of breaking the Laplace transform down into partial fractions which are then inverse-transformed separately. The sum of the resulting partial functions is the wanted time function. Any problems caused by equation system forms are largely limited by appropriate normalization using an auxiliary parameter. The practical limits of program application are reached when the degree of the denominator of the Laplace transform is seven to eight.

Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, INVERSIONS, LAPLACE TRANSFORMATION, LINEAR...

In this talk I will discuss the origin of inertia in a curved spacetime, particularly the spatially flat, open and closed Friedmann universes. This is done using Sciama's law of inertial induction, which is based on Mach's principle, and expresses the analogy between the retarded far fields of electrodynamics and those of gravitation. After obtaining covariant expressions for electromagnetic fields due to an accelerating point charge in Friedmann models, we adopt Sciama's law to obtain the...

Topics: NASA Technical Reports Server (NTRS), ELECTRODYNAMICS, INERTIA, SPACE-TIME FUNCTIONS, UNIVERSE,...

241
241

Jun 26, 2011
06/11

by
Nakamiya, M.; Scheeres, D. J.; Yamakawa, H.; Yoshikawa, M

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Spacecraft capture trajectories to the periodic orbits of the L1 and L2 points in the restricted Hill three-body problem are studied. The specific focus is on transfer to these vicinities from interplanetary trajectories. This application is motivated by future proposals to place ''Deep Space ports'' at the Earth and Mars L1 or L2 points. These spaceports are considered as candidate gateways for interplanetary transfers in the future. We utilize stable manifolds for capture trajectories to...

Topics: ACOUSTICS, REYNOLDS STRESS, TURBULENT FLOW, MATHEMATICAL MODELS, FLOW EQUATIONS, AEROACOUSTICS,...

The gravitational wave window onto the universe is expected to open in approximately 5 years, when ground-based detectors make the first detections in the high-frequency regime. Gravitational waves are ripples in spacetime produced by the motions of massive objects such as black holes and neutron stars. Since the universe is nearly transparent to gravitational waves, these signals carry direct information about their sources - such as masses, spins, luminosity distances, and orbital parameters...

Topics: NASA Technical Reports Server (NTRS), ASTROPHYSICS, GRAVITATIONAL WAVES, UNIVERSE, GRAVITATION,...

Tensor analysis is one of the more abstruse, even if one of the more useful, higher math subjects enjoined by students of physics and engineering. It is abstruse because of the intellectual gap that exists between where most physics and engineering mathematics leave off and where tensor analysis traditionally begins. It is useful because of its great generality, computational power, and compact, easy to use, notation. This paper bridges the intellectual gap. It is divided into three parts:...

Topics: NASA Technical Reports Server (NTRS), COORDINATE TRANSFORMATIONS, RELATIVITY, TENSOR ANALYSIS,...

For over 5 years, people have been living and working in space on the International Space Station (ISS), a state-of-the-art laboratory complex orbiting high above the Earth. Offering a large, sustained microgravity environment that cannot be duplicated on Earth, the ISS furthers humankind s knowledge of science and how the body functions for extended periods of time in space all of which will prove vital on long-duration missions to Mars. On-orbit construction of the station began in November...

Topics: NASA Technical Reports Server (NTRS), INTERNATIONAL SPACE STATION, DESTINY LABORATORY MODULE,...

The design of an optimal dynamic compensator for a multivariable discrete time system is studied. Also the design of compensators to achieve minimum variance control strategies for single input single output systems is analyzed. In the first problem the initial conditions of the plant are random variables with known first and second order moments, and the cost is the expected value of the standard cost, quadratic in the states and controls. The compensator is based on the minimum order...

Topics: NASA Technical Reports Server (NTRS), COMPENSATORS, DISCRETE FUNCTIONS, TIME FUNCTIONS, ANALYSIS...

Space-time velocity correlation measurements between fluctuations occurring in the convoluting outer edge of a flat boundary layer with fluctuations occurring near the viscous subregion were made. The correlations indicate that information is propagated from the outer region to the inner region. The migration of turbulence away from the wall was previously studied in the open literature. The results presented here along with the migration results lend support to the limit cycle model for...

Topics: NASA Technical Reports Server (NTRS), BOUNDARY LAYER FLOW, TURBULENCE, VELOCITY MEASUREMENT,...