Power supply and telemetry systems data for IMP III-Explorer XXVIII
Topic: NASA Technical Reports Server (NTRS)
The Space Telecommunications Radio System (STRS) Architecture Standard describes a standard for NASA space software defined radios (SDRs). It provides a common framework that can be used to develop and operate a space SDR in a reconfigurable and reprogrammable manner. One goal of the STRS Architecture is to promote waveform reuse among multiple software defined radios. Many space domain waveforms are designed to run in the special signal processing (SSP) hardware. However, the STRS Architecture...
Topics: NASA Technical Reports Server (NTRS), RADIO EQUIPMENT, TELECOMMUNICATION, RADIO COMMUNICATION,...
The Hierarchical SEGmentation (HSEG) algorithm, which is a combination of hierarchical step-wise optimization and spectral clustering, has given good performances for hyperspectral image analysis. This technique produces at its output a hierarchical set of image segmentations. The automated selection of a single segmentation level is often necessary. We propose and investigate the use of automatically selected markers for this purpose. In this paper, a novel Marker-based HSEG (M-HSEG) method...
Topics: NASA Technical Reports Server (NTRS), IMAGE CLASSIFICATION, ALGORITHMS, SPECTRUM ANALYSIS, IMAGE...
To determine the feasibility of coupling the output of an optical fiber to a rib waveguide in a temperature environment ranging from 20 C to 300 C, a theoretical calculation of the coupling efficiency between the two was investigated. This is a significant problem which needs to be addressed to determine whether an integrated optic device can function in a harsh temperature environment. Because the behavior of the integrated-optic device is polarization sensitive, a polarization-preserving...
Topics: NASA Technical Reports Server (NTRS), COUPLING, FIBER OPTICS, OPTICAL FIBERS, OPTICAL WAVEGUIDES,...
The Lax-Friedrichs scheme, approximating the scalar, genuinely nonlinear conservation law u sub t + f sub x (u) = 0 where f(u) is, say, strictly convex double dot f dot a sub asterisk 0 is studied. The divided differences of the numerical solution at time t do not exceed 2 (t dot a sub asterisk) to the -1. This one-sided Lipschitz boundedness is in complete agreement with the corresponding estimate one has in the differential case; in particular, it is independent of the initial amplitude in...
Topics: NASA Technical Reports Server (NTRS), CONSERVATION LAWS, ENTROPY, VOID RATIO, COMPUTATION,...
The toxicological assessments of 2 grab sample canisters (GSCs) from the Shuttle are reported. Analytical methods have not changed from earlier reports.
Topics: NASA Technical Reports Server (NTRS), AIR QUALITY, SPACE SHUTTLE ORBITERS, TOXICOLOGY, SPACECRAFT...
Centaur solid state inverter failure during simulated flight in environmental space chamber
Topic: NASA Technical Reports Server (NTRS)
Coronal mass ejections (CMEs) are the most massive explosions in the heliosphere, and the primary drivers of geoeffective space weather. This talk will be focused on fast CMEs, which travel at Alfvenic speeds as high as 2500 km/s. These ejections are associated with solar flares, prominence eruptions, and energetic particles accelerated near the Sun and in interplanetary space. CMEs require sufficient energy storage, in the form of magnetic stress, and rapid release of this energy. Although it...
Topics: NASA Technical Reports Server (NTRS), CORONAL MASS EJECTION, MAGNETIC FIELD RECONNECTION, ENERGETIC...
Mission 3B is designed as a payload retrieval mission with both shuttle launch and orbiter landing to take place at the western test range. The mission is designed for direct rendezvous with a passive satellite in a 100 NMI circular orbit with an inclination of 104 degrees. The ascent portion of mission 3B is described as well as the trajectory simulation.
Topics: NASA Technical Reports Server (NTRS), ASCENT TRAJECTORIES, COMPUTER PROGRAMS, MISSION PLANNING,...
Shrouded composite propulsion system configuration
Topic: NASA Technical Reports Server (NTRS)
The dynamic stability and control characteristics of a four-engine turbofan transport model having an upper-surface blown jet flap were investigated by means of the free-flight technique in the Langley full-scale tunnel. The flight characteristics of the model were investigated through a range of lift coefficients from 3 to 8 with all four engines operating and with one outboard engine not operating. Static characteristics were investigated by conventional power-on force tests over the...
Topics: NASA Technical Reports Server (NTRS), FREE FLIGHT, TURBOFAN AIRCRAFT, UPPER SURFACE BLOWN FLAPS,...
Semiconductor radiation dosimeter in the form of a slender probe is easily inserted into body tissue. The probe has a signal-to-noise ratio that is acceptable to recording equipment and provides realistic measurements of the spatial and energy distributions of radiant electrons and protons.
Topic: NASA Technical Reports Server (NTRS)
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), SAN FRANCISCO BAY (CA), SURFACE PROPERTIES, WATER QUALITY,...
A diamondlike carbon film is deposited in the surface of a substrate by exposing the surface to an argon ion beam containing a hydrocarbon. The current density in the ion beam is low during initial deposition of the film. Subsequent to this initial low current condition, the ion beam is increased to full power. At the same time, a second argon ion beam is directed toward the surface of the substrate. The second ion beam has an energy level much greater than that of the ion beam containing the...
Topics: NASA Technical Reports Server (NTRS), CARBON, DEPOSITION, HARDNESS, ION BEAMS, THIN FILMS, ARGON,...
The X-ray flux from the 3.6 hr binary system H2252-035 is shown to be modulated at a period of 805s. The spectrum is consistent with either a 1.4 photon index power law or 20 keV thermal model. A 560t0r-350 eV equivalent width iron line is seen at approximately 6.7 keV. The possibility that this system contains a slowly rotating neutron star is discussed.
Topics: NASA Technical Reports Server (NTRS), BINARY STARS, PULSARS, PULSE AMPLITUDE, STELLAR SPECTRA, X...
A computer program is presented which calculates the cutter location file needed to machine models of airplane wings or wing-fuselage combinations on numerically controlled machine tools. Input to the program is a data file consisting of coordinates on the fuselage and wing. From this data file, the program calculates tool offsets, determines the intersection between wing and fuselage tool paths, and generates additional information needed to machine the fuselage and/or wing. Output from the...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT MODELS, COMPUTER SYSTEMS PROGRAMS, USER MANUALS...
A method for applying a mixed metal oxide catalyst to a metallic substrate for the creation of a robust, high temperature catalyst system for use in decomposing propellants, particularly hydrogen peroxide propellants, for use in propulsion systems. The method begins by forming a prepared substrate material consisting of a metallic inner substrate and a bound layer of a noble metal intermediate. Alternatively, a bound ceramic coating, or frit, may be introduced between the metallic inner...
Topics: NASA Technical Reports Server (NTRS), CATALYSTS, HIGH TEMPERATURE, METAL OXIDES, SUBSTRATES,...
A method by which energetic cosmic ray particles in the interplanetary medium can diffuse in solar longitude. The method consists of particle motion occurring along current sheets separating discontinuous field structures in the corona. These sheets can serve as pathways along which energetic particles drift at nearly their propagation speed. A model of the coronal magnetic field and the large scale field behavior are analyzed. A mechanism by which particles can travel across the coronal...
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, DIFFUSION, INTERPLANETARY MEDIUM, SOLAR CORONA,...
Topic: NASA Technical Reports Server (NTRS)
A system for coupling an orbital replacement unit (ORU) to a space station structure via the actions of a robot and/or astronaut is described. This system provides mechanical and electrical connections both between the ORU and the space station structure and between the ORU and the ORU and the robot/astronaut hand tool. Alignment and timing features ensure safe, sure handling and precision coupling. This includes a first female type spline connector selectively located on the space station...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC CONNECTORS, END EFFECTORS, ORBITAL SERVICING, SPACE...
Satisfactory performance is reported for the first 12-cell sub-stack of the 5 kW rebuild using improved ABA reactant distribution plates. Construction and test results are described for the first full-sized single-cell test (0.33 m x 0.56 m). Test duration was 450 hours. Plans are outlined for construction and testing of two methanol reformer units based on commercially-available shell-and-tube heat exchangers. A 5 kW-equivalent precursor and a 50 kW-equivalent prototype will be built....
Topics: NASA Technical Reports Server (NTRS), ELECTRIC POWER PLANTS, INTEGRATED ENERGY SYSTEMS, PHOSPHORIC...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
System between the Titan/Centaur launch vehicle and its aerodynamic shroud is described. The system provides a precise spring constant and is capable of being inactivated during flight. Design requirements, design details, and the test program are discussed. The conventional English system of units was used during this development program for all principal measurements and calculations.
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC LOADS, BEARINGS, CENTAUR LAUNCH VEHICLE, TITAN 3...
Thrust and attitude control apparatus using jet nozzle in movable canard surface or fin configuration
Topic: NASA Technical Reports Server (NTRS)
Technology review on ionospheric electron and ion temperature measurement
Topic: NASA Technical Reports Server (NTRS)
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), COASTAL WATER, DELAWARE, OCEAN CURRENTS, TURBIDITY, WATER...
A comprehensive analytical, numerical and experimental study of convective flow in multilayer immiscible liquids has been performed. Studies include transparent high Prandtl number of liquid as well as opaque low Prandtl metallic melts. A new radioscopic flow visualization has been developed for the latter studies.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, CONVECTIVE FLOW, COUPLING, FLOW...
A readout scheme for measuring the output from a SQUID-based sensor-array using an improved subranging architecture that includes multiple resolution channels (such as a coarse resolution channel and a fine resolution channel). The scheme employs a flux sensing circuit with a sensing coil connected in series to multiple input coils, each input coil being coupled to a corresponding SQUID detection circuit having a high-resolution SQUID device with independent linearizing feedback. A...
Topics: NASA Technical Reports Server (NTRS), DYNAMIC RANGE, CIRCUITS, DETECTION, MODULATION, FEEDBACK,...
It is shown mathematically that taking account of the boundary layer is the only way to develop a theory of flapping wings without violating the basic observations and mathematics of hydromechanics. A theory of thrust generation by flapping wings can be developed if the conventional downstream velocity discontinuity surface is replaced with the observed Karman type vortex streets behind a flapping wing. Experiments show that the direction of such vortices is the reverse of that of conventional...
Topics: NASA Technical Reports Server (NTRS), BOUNDARY LAYERS, FLAPPING, HOVERING, WINGS, AERODYNAMIC DRAG,...
Radial focusing of electrons in ion source produces greater ion densities, resulting in higher resolution and focus capability for a given source volume. Electron beam is focused near exit aperture by spherical fields. High density ions allow focusing ion beam to high density at echo, allowing high current through small aperture.
Topic: NASA Technical Reports Server (NTRS)
Cost, time, and social burdens created by need for commuting to work and suggestions for eliminating problems
Topic: NASA Technical Reports Server (NTRS)
Electric conductors used in vacuum environments have smaller cross sections. This report provides data on the correct size wire for a required current load in free-air, low-pressure oxygen, and vacuum environments.
Topic: NASA Technical Reports Server (NTRS)
Using stiffness matrix and lumped-mass representation specified number of natural frequencies are obtained using inverse iteration method. Mode shapes for each frequency are also obtained. These frequencies and mode shapes can be found in reasonable periods of computer time utilizing this code.
Topics: NASA Technical Reports Server (NTRS), CDC 6000 SERIES COMPUTERS, COMPUTER PROGRAMS, FORTRAN, IBM...
Our previous analysis of the energetics of metabolism showed that both the biosynthesis of amino acids and lipids from sugars, and the fermentation of organic substrates, were energetically driven by electron transfer reactions resulting in carbon redox disproportionation (Weber 1997). Redox disproportionation -- the spontaneous (energetically favorable) direction of carbon group transformation in biosynthesis -- is brought about and driven by the energetically downhill transfer of electron...
Topics: NASA Technical Reports Server (NTRS), AMINO ACIDS, METABOLISM, BIOSYNTHESIS, OXIDATION-REDUCTION...
Commercially available general aviation autopilots are currently in transition from an analogue circuit system to a computer implemented digital flight control system. Well known advantages of the digital autopilot include enhanced modes, self-test capacity, fault detection, and greater computational capacity. A digital autopilot's computational capacity can be used to full advantage by increasing the sophistication of the digital autopilot's chief function, stability and control. NASA's...
Topics: NASA Technical Reports Server (NTRS), ALTITUDE CONTROL, AUTOMATIC PILOTS, COMPUTER PROGRAMS,...
The need to store and retrieve large quantities of data at modest cost has generated the need for an economical, compact, archival mass storage system. Very significant improvements in the state-of-the-art of mass storage systems have been accomplished through the development of a number of magnetic, electro-optical, and other related devices. This study was conducted in order to do a trade-off between these data storage devices and the related technologies in order to determine an optimum...
Topics: NASA Technical Reports Server (NTRS), DATA STORAGE, TECHNOLOGY ASSESSMENT, TRADEOFFS, COMPARISON,...
A valve apparatus capable of maintaining a fluid-tight seal over a relatively long period of time by releasably bonding a valve member to its seat is described. The valve member is bonded or welded to the seat and then released by the application of the same energy to the bond joint. The valve member is held in place during the bonding by a clamping device. An appropriate force device can activate the opening and closing of the valve member. Various combinations of material for the valve member...
Topics: NASA Technical Reports Server (NTRS), CONTROL VALVES, HYDRAULIC EQUIPMENT, METAL BONDING,...
Lateral range requirements used in selecting spacecraft landing recovery sites for return from low circular orbits
Topic: NASA Technical Reports Server (NTRS)
Astronauts experience disturbances in sensorimotor function after spaceflight during the initial introduction to a gravitational environment, especially after long-duration missions. Stochastic resonance (SR) is a mechanism by which noise can assist and enhance the response of neural systems to relevant, imperceptible sensory signals. We have previously shown that imperceptible electrical stimulation of the vestibular system enhances balance performance while standing on an unstable surface....
Topics: NASA Technical Reports Server (NTRS), PSYCHOMOTOR PERFORMANCE, COUNTERMEASURES, STOCHASTIC...
Bench runs of a modified V-1710-93 engine equipped with a two-stage supercharger, interstage carburetor, aftercooler assembly, and backfire screens have been made at a simulated altitude of 29,000 feet to determine the effect of several induction-system modifications on the engine and supercharger performance. The standard guide vanes on the auxiliary- and engine-stage superchargers were replaced by rotating guide vanes with a parabolic blade profile. The auxiliary-stage inlet elbow and...
Topic: NASA Technical Reports Server (NTRS)
A clinostat for simulating microgravity on cell systems carried in a fiber fixedly mounted in a rotatable culture vessel is disclosed. The clinostat is rotated horizontally along its longitudinal axis to simulate microgravity or vertically as a control response. Cells are injected into the fiber and the ends of the fiber are sealed and secured to spaced end pieces of a fiber holder assembly which consists of the end pieces, a hollow fiber, a culture vessel, and a tension spring with three...
Topics: NASA Technical Reports Server (NTRS), BIOLOGICAL EFFECTS, CELLS (BIOLOGY), CULTURE TECHNIQUES,...
The most important properties of shift register generated sequences are exposed. The application of shift registers as multiplication and division circuits leads to the generation of some error correcting and detecting codes.
Topic: NASA Technical Reports Server (NTRS)
An analysis of the current operations concepts of NASA and DoD is presented to determine if alternatives exist which may improve the utilization of resources. The final product is intended to show how sensitive these ground rules and design approaches are relative to the total cost of doing business. The results are comparative in nature, and assess one concept against another as opposed to establishing an absolute cost value for program requirements. An assessment of the mission...
Topics: NASA Technical Reports Server (NTRS), ENGINEERING MANAGEMENT, NASA PROGRAMS, COST ANALYSIS,...
Adhesion and sliding friction influenced by structure, orientation, and solubility of metal single crystals
Topic: NASA Technical Reports Server (NTRS)
A major innovation of the Civil Service Reform Act of 1978 was the creation of a Senior Executive Service (SES). The purpose of the SES is both simple and bold: to attract executives of the highest quality into Federal service and to retain them by providing outstanding opportunities for career growth and reward. The SES is intended to: provide greater authority in managing executive resources; attract and retain highly competent executives, and assign them where they will effectively...
Topics: NASA Technical Reports Server (NTRS), PERSONNEL, PERSONNEL DEVELOPMENT, PERSONNEL MANAGEMENT,...
This project dealt with the application of a Direct Model Reference Adaptive Control algorithm to the control of a PUMA 560 Robotic Manipulator. This chapter will present some motivation for using Direct Model Reference Adaptive Control, followed by a brief historical review, the project goals, and a summary of the subsequent chapters.
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, CONTROL SYSTEMS DESIGN, MANIPULATORS, MODEL...
Rear stage blading designs that have lower losses in their endwall boundary layer regions were studied. A baseline Stage A was designed as a low-speed model of stage 7 of a 10-stage compressor. Candidate rotors and stators were designed which have the potential of reducing endwall losses relative to the baseline. Rotor B uses a type of meanline in the tip region that unloads the leading edge and loads the trailing edge relative to the baseline rotor A designs. Rotor C incorporates a more skewed...
Topics: NASA Technical Reports Server (NTRS), AIRFOIL PROFILES, BLADE TIPS, COMPRESSOR BLADES,...
A continuing effort to develop carbon-nanotube-based field emitters (cold cathodes) as high-current-density electron sources has yielded an optimized device design and a fabrication scheme to implement the design. One major element of the device design is to use a planar array of bundles of carbon nanotubes as the field-emission tips and to optimize the critical dimensions of the array (principally, heights of bundles and distances between them) to obtain high area-averaged current density and...
Topics: NASA Technical Reports Server (NTRS), BUNDLES, CARBON NANOTUBES, ELECTRODES, FABRICATION, FIELD...
Aft fan noise reduction techniques were investigated. The 1/3 octave band sound data were plotted with the following plots included: perceived noise level vs acoustic angle at 2 fan speeds; PWL vs frequency at 2 fan speeds; and sound pressure level vs frequency at 2 aft angles and 2 fan speeds. The source noise plots included: band pass filter sound pressure level vs acoustic angle at 2 fan speeds; and 2nd harmonic SPL acoustic angle at 2 fan speeds.
Topics: NASA Technical Reports Server (NTRS), NOISE REDUCTION, SHORT HAUL AIRCRAFT, TURBOFANS, ACOUSTIC...
