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by NASA Technical Reports Server (NTRS)
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Gemini 4 earth orbital mission - commentary on walk in space and other extravehicular activities
Topic: NASA Technical Reports Server (NTRS)
Subsonic nuclear powered logistic airplane with helium-cooled reactor
Topic: NASA Technical Reports Server (NTRS)
Experimental and calculated supersonic flutter characteristics of X-15 horizontal and vertical tails
Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Multiple-orifice throttle valve is not subject to cold welding in a vacuum environment and is compatible with strong oxidizing fluid. The valve is of all metal construction using simple components that do not slide or rotate and excludes static or dynamic seals.
Topic: NASA Technical Reports Server (NTRS)
Digital computation of hydrodynamic forces and moments for liquid sloshing in propellant tanks with rotational symmetry
Topic: NASA Technical Reports Server (NTRS)
Tester enables direct measurement of the resonant frequency of an yttrium iron garnet disk. The disk is tested while mounted on the isolator strip with less regard for dimensional flaws.
Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
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Digital computer program develops temperature control system which maintains various subsystems within proper temperature limits. Coding is simple and input rules are easy to use and remember. Output format is easy to understand and to analyze for error diagnosis.
Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
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Wide angle eyepiece with long eye-relief distance
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Vacuum impregnation process produces metal-reinforced ceramics with only 3 percent void space volumes. Method may be used to produce metal-reinforced ceramics for high temperature or structural applications such as furnace supports and armor.
Topics: NASA Technical Reports Server (NTRS), ALUMINUM, BORON, CARBIDES, CERAMICS, COMPOSITE MATERIALS,...
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), GULF OF MEXICO, LAND USE, MISSISSIPPI, REMOTE SENSORS, EARTH...
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), ALTIMETERS, TERRAIN ANALYSIS, TOPOGRAPHY, CALIBRATING, EREP,...
Continuous and discontinuous NaF fibers, embedded in a NaCl matrix, were produced in space and on earth. The production of continuous fibers in a eutectic mixture is attributed to the absence of convection current in the liquid during solidification in space. Image transmission and optical transmittance measurements of transverse sections of the space-grown and earth-grown ingots were made with a light microscope and a spectrometer. It is shown that better optical properties were obtained from...
Topics: NASA Technical Reports Server (NTRS), CRYSTAL GROWTH, EUTECTIC ALLOYS, SKYLAB PROGRAM, SODIUM...
The attrition assessment of the aft segments of Solid Rocket Motor due to water impact requires the establishment of a correlation between loading occurrences and structural capability. Each discrete load case, as identified by the water impact velocities and angle, varies longitudinally and radially in magnitude and distribution of the external pressure. The distributions are further required to be shifted forward or aft one-fourth the vehicle diameter to assure minimization of the effect of...
Topics: NASA Technical Reports Server (NTRS), COMMINUTION, SOLID PROPELLANT ROCKET ENGINES, WATER PRESSURE,...
The Fail-Safe Abort System TEMPerature Analysis Program, (FASTEMP), user's manual is presented. This program was used to analyze fail-safe abort systems for an actively cooled hypersonic aircraft. FASTEMP analyzes the steady state or transient temperature response of a thermal model defined in rectangular, cylindrical, conical and/or spherical coordinate system. FASTEMP provides the user with a large selection of subroutines for heat transfer calculations. The various modes of heat transfer...
Topics: NASA Technical Reports Server (NTRS), ABORT APPARATUS, FAIL-SAFE SYSTEMS, HYPERSONIC AIRCRAFT, USER...
The author has identified the following significant results. The most significant achievement thus far includes the successful charting of high probability fishing areas from LANDSAT MSS data and the successful simulation of an operational satellite system to provide tactical information for the commercial harvest of menhaden.
Topics: NASA Technical Reports Server (NTRS), COASTS, FISHES, GULF OF MEXICO, LOUISIANA, MARINE RESOURCES,...
A lightweight pyrogen igniter assembly including an elongated molded plastic tube adapted to contain a pyrogen charge was designed for insertion into a rocket motor casing for ignition of the rocket motor charge. A molded plastic closure cap provided for the elongated tube includes an ignition charge for igniting the pyrogen charge and an electrically actuated ignition squib for igniting the ignition charge. The ignition charge is contained within a portion of the closure cap, and it is...
Topics: NASA Technical Reports Server (NTRS), COMPOSITE MATERIALS, IGNITERS, MOLDING MATERIALS, PYROGEN,...
Mixed powders (60 m/o Al2O3-40 m/o Si3N4) were hot pressed at temperatures and pressures from 1360 to 1750 C and 3.5 to 27.5 MPa (0.5 to 4.0 ksi). Fully dense sialon bodies are obtainable at temperatures and pressures as low as 1550 C and 0.5 ksi. The fully dense bodies contain Beta prime and x-phase. There is some evidence that plastic deformation has contributed to densification.
Topics: NASA Technical Reports Server (NTRS), HOT PRESSING, PRESSURE EFFECTS, TEMPERATURE EFFECTS, ALUMINUM...
NASA Network Resource and Training Site
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Radio metric deep space navigation relies nearly exclusively upon coherent, two way, Doppler and ranging for all precise applications. These data types and the navigational accuracies they can produce are reviewed. The deployment of hydrogen maser frequency standards and the development of Very Long Baseline Interferometry (VLBI) systems within the Deep Space Network are used in the development of non-coherent, one way data forms that promise much greater inherent navigational accuracy. The...
Topics: NASA Technical Reports Server (NTRS), DEEP SPACE, RADIO NAVIGATION, SPACE NAVIGATION, CLOCKS, DEEP...
Measured data obtained by Michelson interferometer spectrometer were stored in a computer file and smoothed by being passed forward and backward through a digital four-pole low pass filter. Infrared spectra of the 10 lunar samples are presented in the format of brightness temperature versus frequency. The mol % of feldspar, pyroxene, olivine, ilmenite and ferromagnetic silicate in each sample is presented in tables. The reflectance spectra of ilmenite and enstatite are shown in graphs.
Topics: NASA Technical Reports Server (NTRS), INFRARED SPECTRA, LUNAR SOIL, MICHELSON INTERFEROMETERS,...
Computer programs for degaussing, magnetic field calculation, low speed wing flap systems aerodynamics, structural panel analysis, dynamic stress/strain data acquisition, allocation and network scheduling, and digital filters are discussed.
Topics: NASA Technical Reports Server (NTRS), DIGITAL FILTERS, MAGNETIC FIELD CONFIGURATIONS, NETWORK...
Two versions of a 36 stainless steel solar module were built. The first version was built as a commercial module for marine applications and was purchased for evaluation by JPL. Design deficiencies were identified as a result of the evaluation. The second version was built and the improvements that resulted from design changes are described. Assembly problems, electrical performance, and qualification test results are provided.
Topics: NASA Technical Reports Server (NTRS), CIRCUIT PROTECTION, DESIGN ANALYSIS, SOLAR CELLS, ASSEMBLING,...
A communication system using a satellite with a 118 meter diameter quad aperture antenna to provide telephone service to mobile users remotely located from the large metropolitan areas where the telephone companies are presently implementing their cellular system is described. In this system, which is compatible with the cellular system, the mobile user communicates with the satellite at UHF frequencies. The satellite connects him at S-Band, to the existing telephone network via a base station....
Topics: NASA Technical Reports Server (NTRS), ANTENNAS, APERTURES, LAND MOBILE SATELLITE SERVICE, PARABOLIC...
The service lifetime of glass and ceramic materials can be expressed as a plot of time-to-failure versus applied stress whose plot is parametric in percent probability of failure. This type of plot is called a design diagram. Confidence interval estimates for such plots depend on the type of test that is used to generate the data, on assumptions made concerning the statistical distribution of the test results, and on the type of analysis used. This report outlines the development of design...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, DESIGN ANALYSIS, DIAGRAMS, FATIGUE TESTS, GLASS,...
NASA Network Resource and Training Site
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Described is a computer simulation of a Boeing 737 aircraft equipped with an enhanced Traffic and Collision Avoidance System (TCAS II). In particular, an algorithm is developed which permits the computer simulation of the tracking of a target airplane by a Boeing 373 which has a TCAS II array mounted on top of its fuselage. This algorithm has four main components: namely, the target path, the noise source, the alpha-beta filter, and threat detection. The implementation of each of these four...
Topics: NASA Technical Reports Server (NTRS), BOEING 737 AIRCRAFT, COLLISION AVOIDANCE, COMPUTERIZED...
The Jet Propulsion Laboratory's (JPL) Telerobot Testbed is an integrated robotic testbed used to develop, implement, and evaluate the performance of advanced concepts in autonomous, tele-autonomous, and tele-operated control of robotic manipulators. Using the Telerobot Testbed, researchers demonstrated several of the capabilities and technological advances in the control and integration of robotic systems which have been under development at JPL for several years. In particular, the Telerobot...
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, MANIPULATORS, ROBOT ARMS, ROBOTICS,...
NASA Network Resource and Training Site
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The overall philosophy of the research was to develop and characterize new high temperature power conversion and radiator materials and to provide spacecraft designers with material selection options and design information. Research on three candidate materials (carbide strengthened niobium alloy PWC-11 for fuel cladding, graphite fiber reinforced copper matrix composites for heat rejection fins, and tungsten fiber reinforced niobium matrix composites for fuel containment and structural...
Topics: NASA Technical Reports Server (NTRS), CLADDING, CONTAINMENT, FIBER COMPOSITES, FINS, HIGH...
NASA Network Resource and Training Site
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With the forms of superchargers and underlying principles of computation, delivery heads per stage of 7,000 to 8,500 meters (air column) at an effective efficiency, based on the adiabatic process, of 0.7 may be attained, the space and weight requirements being kept within reasonable limits.
Topic: NASA Technical Reports Server (NTRS)
At the request of the Bureau of Aeronautics, Department of the Navy, National Advisory Committee for Aeronautics has conducted a preliminary investigation at high subsonic speeds of the static longitudinal and lateral stability characteristics of a 0.05-scale model of the Convair F2Y-1 water-based fighter airplane. The tests covered a Mach number range from 0.5 to 0.94 and corresponding Reynolds numbers, based on the wing mean aerodynamic chord, from 3.3 x 10(exp 6) to 4.3 x 10(exp 6). The...
Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Curve generator capable of producing precisely repeatable curve for any single-valued function of voltage versus time uses digital approach, implemented by means of clocked feedback shift register, large scale integrated circuit diode matrix comprising about 12,000 diodes, counter, and digital-to-analog converter.
Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
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Emissions from a simple 10-cm (4-in.) diameter tube combustor burning a premixed, gaseous propane/air mixture were measured. Inlet conditions included a temperature of 590 K (600 F), pressure of 5.5 atm, and reference velocity of 23 m/s (75 ft/s) for a range of equivalence ratios from the lean limit to slightly richer than stoichiometric. A nitric oxide emission index of 1 g NO2/kg fuel was measured for an equivalence ratio of 0.57.
Topics: NASA Technical Reports Server (NTRS), FUEL COMBUSTION, FUEL-AIR RATIO, GAS MIXTURES, NITRIC OXIDE,...
Shape and inner flow of a tridimensional spark are studied. The spark is created by focusing a laser beam in a gas. A second order fully non-linear equation is derived for the radial velocity on the axis of symmetry in the neighborhood of the origin. Solutions to that equation display the existence of a forbidden region near the focus, thus indicating the limits of applicability of a small perturbation solution.
Topics: NASA Technical Reports Server (NTRS), DETONATION, LASERS, SHOCK WAVES, SPHERICAL WAVES, BOUNDARY...
The development of an Emergency Medical Services System grant application for the Permian Basin Region of West Texas is described along with the application of NASA-developed technology. Conclusions and recommendations are included.
Topics: NASA Technical Reports Server (NTRS), FEASIBILITY ANALYSIS, MEDICAL SERVICES, TEXAS, NASA PROGRAMS,...
NASA Network Resource and Training Site
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The preparation of a growth hormone from human serum was used for the isolation of the hormone from calf serum. The preparation was biologically active - it increased the quantity of the free fatty acids released in rat plasma by 36.4 percent. Electrophoresis in Veronal buffer, ph 8.6, showed the presence of a single fraction having mobility intermediate between that of alpha and beta globulins. Gel filtration through Sephadex G 100 showed an elutriation curve identical to that obtained by the...
Topics: NASA Technical Reports Server (NTRS), BIOLOGICAL EFFECTS, ERYTHROCYTES, GLOBULINS, IMMUNOLOGY,...
The procedures used and the results obtained during the evaluation test program on a liquid solar collector are presented. The narrow flat plate collector with reflective concentrating mirrors uses water as the working fluid. The double-covered collector weighs 137 pounds and has overall dimensions of about 35" by 77" by 6.75". The test program was conducted to obtain the following information: thermal performance data under simulated conditions, structural behavior under static...
Topics: NASA Technical Reports Server (NTRS), LONG TERM EFFECTS, SOLAR COLLECTORS, THERMODYNAMIC...
A method of preventing oxidation of graphite fireproof material is given. A blend of 1 to 33 weight parts alumina and 3 to 19 parts of K2O + Na2O in 100 parts of SiO2 is pulverized followed by addition of 5 to 160 parts of silicon carbide powder in 100 parts of the mixture. This is thoroughly blended and coated on the surface of graphite fireproof material.
Topics: NASA Technical Reports Server (NTRS), COATINGS, FIREPROOFING, GRAPHITE, OXIDATION RESISTANCE,...
NASA Network Resource and Training Site
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The implementation of DDLTRN and DDLSIM programs on SEL-2 computer system is reported. These programs were tested with DDL descriptions of various complexity. An algorithm to synthesize the combinational logic using the cells available in the standard IC cell library was formulated. The algorithm is implemented as a FORTRAN program and a description of the program is given.
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, COMPUTER AIDED DESIGN, COMPUTER PROGRAMS,...
NASA Network Resource and Training Site
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The status and general characteristics of Space Shuttle upper stages now in use or in development, as well as new vehicle possibilities are examined. Upper stage requirements for both civil and Department of Defense missions, categorized generally into near-term (early and mid-1980's), mid-term (late 1980's to mid-1990's), and far-term (late 1990's and beyond) are discussed. Finally, the technical, schedule and cost impact of alternative ways in which these requirements could be met are...
Topics: NASA Technical Reports Server (NTRS), CENTAUR LAUNCH VEHICLE, INERTIAL UPPER STAGE, MISSION...
NASA Network Resource and Training Site
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The cleaning and magnetic tape storage of spherical Earth processing programs are reported. These programs include: NVERTSM which inverts total or vector magnetic anomaly data on a distribution of point dipoles in spherical coordinates; SMFLD which utilizes output from NVERTSM to compute total or vector magnetic anomaly fields for a distribution of point dipoles in spherical coordinates; NVERTG; and GFLD. Abstracts are presented for papers dealing with the mapping and modeling of magnetic and...
Topics: NASA Technical Reports Server (NTRS), DIURNAL VARIATIONS, EARTH CRUST, EARTH GRAVITATION,...
A program was conducted with the objective of developing advanced thermal barrier coating (TBC) systems. Coating application was by plasma spray. Duplex, triplex and graded coatings were tested. Coating systems incorporated both NiCrAly and CoCrAly bond coats. Four ceramic overlays were tested: ZrO2.82O3; CaO.TiO2; 2CaO.SiO2; and MgO.Al2O3. The best overall results were obtained with a CaO.TiO2 coating applied to a NiCrAly bond coat. This coating was less sensitive than the ZrO2.8Y2O3 coating...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, FUEL CONSUMPTION, FUEL CONTAMINATION, GAS TURBINES,...
Production and anneal of defects in electron-irradiated, float-zone silicon solar cells were studied by DLTS. In boron- and gallium-doped, n+-p cells, dominant defects were due to the divacancy, carbon interstitial, and carbon complex. Results suggest that the DLTS peak normally ascribed to carbon complexes also involves gallium. For gallium- and, to a lesser extent, boron-doped samples, damaged lifetime shows substantial recovery only when the carbon-complex peak has annealed out at 400 C. In...
Topics: NASA Technical Reports Server (NTRS), ALUMINUM, ANNEALING, BORON, DOPES, GALLIUM, POINT DEFECTS,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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A five parameter gamma distribution (BGD) having two shape parameters, two location parameters, and a correlation parameter is investigated. This general BGD is expressed as a double series and as a single series of the modified bessel function, and reduces to the known special case for equal shape parameters. Practical functions for computer evaluations for the general BGD and for special cases are presented. Applications are to be bound in reliability theory, signal noise, and meteorology....
Topics: NASA Technical Reports Server (NTRS), ASCENT, DISTRIBUTION FUNCTIONS, GUST LOADS, PARAMETER...
The simulation language for alternate modeling (SLAM 2) is a general purpose language that combines network, discrete event, and continuous modeling capabilities in a single language system. The efficacy of the system's network modeling is examined and discussed. Examples are given of the symbolism that is used, and an example problem and model are derived. The results are discussed in terms of the ease of programming, special features, and system limitations. The system offers many features...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, NETWORK SYNTHESIS, PROGRAMMING...
The mathematical models embodied in the simulation are described in considerable detail and with supporting evidence for the model forms chosen. In addition the trimming and linearization algorithms used in the simulation are described. Appendices to the manual identify reference material for estimating the needed coefficients for the input data and provide example simulation results.
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC CHARACTERISTICS, AERODYNAMIC FORCES, FLIGHT...
Development was continued for iron-chromium battery operation at 65 C. Membranes that were adequate at 25 C were shown to be unacceptable at 65 C with regard to selectivity. This led to the elevated-temperature, mixed-reactant mode of operation, in which each reactant solution, when discharged, contains both ferrous and chromic chlorides. This operating mode allows the use of very low-resistivity membranes, resulting in high energy efficiencies at current densities. It also allows the use of...
Topics: NASA Technical Reports Server (NTRS), ELECTROCHEMISTRY, REACTION KINETICS, REDOX CELLS, BISMUTH,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Certain aspects of the description and measurement of oscillator stability are treated. Topics covered are time and frequency deviations, Allan variance, the zero-crossing counter measurement technique, frequency drift removal, and the three-cornered hat.
Topics: NASA Technical Reports Server (NTRS), DRIFT RATE, ERRORS, FREQUENCY STABILITY, OSCILLATORS,...
The distribution of the atomic and ionized hydrogen along the inner spiral arms of M51 are compared. As is the case in M83, the location of both these phases of the interstellar medium with respect to the major dust lanes suggests that molecular hydrogen is dissociated on kpc scales in active star-forming regions, and that this dissociation process may strongly affect the observed morphology of atomic hydrogen in spiral arms.
Topics: NASA Technical Reports Server (NTRS), DENSITY WAVE MODEL, DUST, GALACTIC STRUCTURE, MOLECULAR...
A preliminary evaluation was made by ORNL of a two-color ratio pyrometer (TCRP) for temperature control in the Modular Electromagnetic Levitation (MEL) experiment. A discussion was presented by Eric Spjut at the 1987 NASA Non-Contact Temperature Measurement Workshop (NASA Conf. Publ. 2503, pp. 182-213) in which he described the non-linear characteristics of the time response of TCPs. Researchers replicated his model and results and note that the non-linear response behavior is minimized for...
Topics: NASA Technical Reports Server (NTRS), CONTROLLERS, DYNAMIC RESPONSE, ERRORS, FEEDBACK, NIOBIUM,...
For electric utilities, the ability to prevent or minimize lightning damage on personnel and power systems is of great importance. Therefore, the Swedish State Power Board, has been using data since 1983 from a nationwide lightning location system (LLS) for accurately locating lightning ground strikes. Lightning data is distributed and presented on color graphic displays at regional power network control centers as well as at the national power system control center for optimal data use. The...
Topics: NASA Technical Reports Server (NTRS), INDUSTRIAL SAFETY, LIGHTNING, NETWORK CONTROL, POWER LINES,...
NASA Network Resource and Training Site
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Moon Park has been proposed as an International Space Year (ISY) event for international cooperative efforts. Moon Park will serve as a terrestrial demonstration of a prototype lunar base and provide research and educational opportunities. The kind of data that can be obtained in the Moon Park facilities is examined taking the minimum number of lunar base residents as an example.
Topics: NASA Technical Reports Server (NTRS), CLOSED ECOLOGICAL SYSTEMS, HUMAN BEHAVIOR, HUMAN FACTORS...
We consider the nonlinear stability of a fully three-dimensional boundary layer flow in an incompressible fluid and derive an equation governing the nonlinear development of a stationary cross-flow vortex. The amplitude equation is a novel integro-differential equation which has spatial derivatives of the amplitude occurring in the kernal function. It is shown that the evolution of the cross-flow vortex is strongly coupled to the properties of an unsteady wall layer which is in fact driven by...
Topics: NASA Technical Reports Server (NTRS), BOUNDARY LAYER FLOW, CROSS FLOW, FLOW STABILITY,...
NASA Network Resource and Training Site
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JAVA PATHFINDER, JPF, is a prototype translator from JAVA to PROMELA, the modeling language of the SPIN model checker. JPF is a product of a major effort by the Automated Software Engineering group at NASA Ames to make model checking technology part of the software process. Experience has shown that severe bugs can be found in final code using this technique, and that automated translation from a programming language to a modeling language like PROMELA can help reducing the effort required.
Topics: NASA Technical Reports Server (NTRS), JAVA (PROGRAMMING LANGUAGE), COMPUTER PROGRAMMING, SOFTWARE...
The research effort has led to the development and demonstration of technology to enable the design and construction of a next-generation high-energy gamma-ray telescope that operates in the pair-production regime (E greater than 10 MeV). In particular, the technology approach developed is based on silicon-strip detector technology. A complete instrument concept based on this technology for the pair-conversion tracker and the use of CsI(T1) crystals for the calorimeter is now the baseline...
Topics: NASA Technical Reports Server (NTRS), GAMMA RAY TELESCOPES, BROADBAND, DESIGN ANALYSIS, SILICON,...
Plant experiments in space will require active nutrient delivery concepts in which water and nutrients are replenished on a continuous basis for long-term growth. The goal of this study is to develop a novel microsensor array to provide information on the dissolved oxygen environment in the plant root zone for the optimum control of plant cultivation systems in the space environment. Control of water and oxygen is limited by the current state-of-the-art in sensor technology. Two capabilities of...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENVIRONMENTS, VEGETATION GROWTH, PLANT ROOTS,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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This paper presents viewgraphs on capability structure 9.4 servicing. The topics include: 1) Servicing Description; 2) Benefits of Servicing; 3) Drivers & Assumptions for Servicing; 4) Capability Breakdown Structure 9.4 Servicing; 5) Roadmap for Servicing; 6) 9.4 Servicing Critical Gaps; 7) Capability 9.4 Servicing; 8) Capability 9.4.1 Inspection; 9) State-of-the-Art /Maturity Level /Capabilities for 9.4.1 Inspection; 10) Capability 9.4.2 Diagnostics; 11) State-of-the-Art/Maturity Level...
Topics: NASA Technical Reports Server (NTRS), SYSTEMS ENGINEERING, LOGISTICS, TECHNOLOGY UTILIZATION,...
NASA Network Resource and Training Site
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Chromium boron diffusion coatings on nickel iron alloys uniquely provide them with improvement in high cycle fatigue strength (up to 30%) and erosion resistance (up to 15 times), compared to uncoated alloy. The diffused chromium layer extends in two essential concentration zones to a total depth of about 40.times.10.sup.-6 m, while the succeeding boron layer is limited to 50-90% of the depth of the richest Cr layer nearest the surface. Both coatings are applied using conventional pack diffusion...
Topics: NASA Technical Reports Server (NTRS), BORON, BORON ALLOYS, CHROMIUM, CORROSION RESISTANCE,...
The present invention relates to a system and method of organic thin-film transistors (OTFTs). More specifically, the present invention relates to employing a flexible, conductive particle-polymer composite material for ohmic contacts (i.e. drain and source).
Topics: NASA Technical Reports Server (NTRS), CARBON, THIN FILMS, TRANSISTORS, POLYMER MATRIX COMPOSITES,...
NASA Network Resource and Training Site
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The item to be cleared is a low-fidelity software simulation model of a hypothetical freeflying robot designed for use in zero gravity environments. This simulation model works with the HCC simulation system that was developed by Xerox PARC and NASA Ames Research Center. HCC has been previously cleared for distribution. When used with the HCC software, the model computes the location and orientation of the simulated robot over time. Failures (such as a broken motor) can be injected into the...
Topics: NASA Technical Reports Server (NTRS), ROBOTS, SOFTWARE ENGINEERING, MATHEMATICAL MODELS, COMPUTER...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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The lack of absorption features in the transmission spectrum of exoplanet GJ1214b rules out a hydrogen-rich atmosphere for the planet. It is consistent with an atmosphere rich in water vapour or abundant in clouds.
Topics: NASA Technical Reports Server (NTRS), EXTRASOLAR PLANETS, ATMOSPHERIC MOISTURE, EXTRATERRESTRIAL...
NASA Network Resource and Training Site
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This presentation provides a high level view of current and future electronic parts management at NASA. It describes a current perspective of the new human space flight direction that NASA is beginning to take and how that could influence parts management in the future. It provides an overview of current NASA electronic parts policy and how that is implemented at the NASA flight Centers. It also describes some of the technical challenges that lie ahead and suggests approaches for their...
Topics: NASA Technical Reports Server (NTRS), SPACE COMMERCIALIZATION, PACKAGING, INTERNATIONAL SPACE...
The dramatic journey of the crippled Apollo 13 vehicle has been heavily documented and popularized. Many people know there was an explosion in the service module which caused the vehicle to lose its oxygen supply. Less well known is the set of circumstances which led to the explosion. This paper examines the manufacturing, processing and testing history of oxygen tank #2, detailing the additive effects which caused the oxygen to ignite and to overpressure the tank.
Topics: NASA Technical Reports Server (NTRS), OVERPRESSURE, PROPELLANT TANKS, MANUFACTURING, ENGINE...
This presentation examines organizational factors that contributed to three aircraft mishaps and provides analysis of lessons learned. Three historical aviation mishaps were studied from a human factors perspective, and organizational factors identified and analyzed. These case studies provide valuable lessons for understanding the interaction of people with aircraft systems and with each other during flight operations.
Topics: NASA Technical Reports Server (NTRS), HUMAN FACTORS ENGINEERING, FLIGHT OPERATIONS, CASE HISTORIES,...
NASA Network Resource and Training Site
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Data relay and tracking capability of lunar communication satellites above lunar far side surface
Topic: NASA Technical Reports Server (NTRS)
Synthesis studies of the daytime lunar atmoshere were directed toward improved understanding of fundamental lunar atmospheric dynamics and the relationship of the detectable atmosphere to physical processes of the lunar surface and interior. The primary source of data is the Apollo 17 lunar surface mass spectrometer. The Ar40 is radiogenic and its escape rate from the lunar atmosphere requires release of a significant fraction (about 8%) of the argon produced from the decay of K40 within the...
Topics: NASA Technical Reports Server (NTRS), DAYTIME, LUNAR ATMOSPHERE, LUNAR EXPLORATION, LUNAR PROGRAMS,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Large positive anomalies have been discovered in the moon's gravitational field. The concept of mascons as the source of these anomalies was reviewed. Ideas set forth in the literature and related in some manner to mascons are summarized. Lunar structure and evolution are emphasized and it is concluded that more detailed studies of the moon by spacecraft are needed to solve remaining uncertainties.
Topics: NASA Technical Reports Server (NTRS), GRAVITY ANOMALIES, LUNAR EVOLUTION, LUNAR EXPLORATION,...
Hydrogen is emitted by aluminum heated in a vacuum after high-temperature steam treatment. Wire samples are tested for this effect, showing dependence on surface area. Two different mechanisms of absorption are inferred, and reactions deduced.
Topics: NASA Technical Reports Server (NTRS), ALUMINUM, HIGH TEMPERATURE RESEARCH, HYDROGEN ATOMS,...
The technique of flash photolysis-resonance fluorescence was utilized to study nine reactions of stratospheric importance. The tropospheric degradation reactions of seven halogenated hydrocarbons were studied to assess their possible influx into the stratosphere. There are reactions of either Cl, OH, or O(3P) species with hydrogenated species, O3 or chlorinated compounds. Apart from the kinetic measurements, the quantum yield for the production of O(1D) from O3 in the crucial wavelength region...
Topics: NASA Technical Reports Server (NTRS), CHLORINE COMPOUNDS, FLUORESCENCE, OPTICAL RESONANCE,...
Concepts for advancing the state of the art in the design of unmanned spacecraft, the requirements that gave rise to its configuration, and the programs of technology that are suggested as leading to its eventual development are examined. Particular technology issues discussed include: structures and materials; thermal control; propulsion; electrical power; communications; data management; and guidance, navigation, and control.
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENGINEERING, SATELLITE CONFIGURATIONS, SPACECRAFT...
The needs for computerized structural mechanics (CSM) as seen from the standpoint of the aircraft industry are discussed. These needs are projected into the 1990's with special focus on the new advanced materials. Preliminary design/analysis, research, and detail design/analysis are identified as major areas. The role of local/global analyses in these different areas is discussed. The lessons learned in the past are used as a basis for the design of a CSM framework that could modify and...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT CONSTRUCTION MATERIALS, AIRCRAFT DESIGN, AIRCRAFT...
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As AMSC enters the market with its mobile satellite services, it faces a sophisticated user group that has already experimented with a wide range of communications services, including cellular radio and Ku-band satellite messaging. AMSC's challenge is to define applications unique to the capabilities of its dedicated L band satellite and consistent with the provisions outlined in its FCC license. Through a carefully researched approach to its three main markets (aeronautical, land mobile, and...
Topics: NASA Technical Reports Server (NTRS), LAND MOBILE SATELLITE SERVICE, SUPERHIGH FREQUENCIES,...
Conference on lithium doped silicon solar cell development and fabrication methods
Topics: NASA Technical Reports Server (NTRS), CARRIER INJECTION, CONFERENCES, LITHIUM, PRODUCTION...
A program was conducted at Douglas Aircraft Company to develop the technology for critical joints in composite wing structure that meets all the design requirements of a 1990 commercial transport aircraft. In fulfilling this objective, analytical procedures for joint design and analysis were developed during Phase 1 of the program. Tests were conducted at the element level to supply the empirical data required for methods development. Large composite multirow joints were tested to verify the...
Topics: NASA Technical Reports Server (NTRS), COMMERCIAL AIRCRAFT, COMPOSITE STRUCTURES, JOINTS...
The geologic exploration of the Moon will be one of the primary scientific functions of any lunar base program. Geologic reconnaissance, the broad-scale characterization of processes and regions, is an ongoing effort that has already started and will continue after base establishment. Such reconnaissance is best done by remote sensing from lunar orbit and simple, automated, sample return missions of the Soviet Luna class. Field study, in contrast, requires intensive work capabilities and the...
Topics: NASA Technical Reports Server (NTRS), LUNAR EXPLORATION, LUNAR GEOLOGY, LUNAR ROVING VEHICLES,...
Redundant manipulators may compensate for failed joints with their additional degrees of freedom. In this paper such a manipulator is considered fault tolerant if it can guarantee completion of a task after any one of its joints has failed. This fault tolerance of kinematically redundant manipulators is insured here. Methods to analyze the manipulator's work space find regions inherently suitable for critical tasks because of their high level of failure tolerance. Constraints are then placed on...
Topics: NASA Technical Reports Server (NTRS), FAULT TOLERANCE, JOINTS (JUNCTIONS), MANIPULATORS,...
This viewgraph presentation provides an overview of activities at DASA-RI concerning the testing of wires for manned spacecraft, including test facilities, arc-tracking tests, flammability tests, microgravity tests, and standardization, and outlines future activities.
Topics: NASA Technical Reports Server (NTRS), ELECTRIC EQUIPMENT TESTS, ELECTRIC WIRE, ELECTRICAL...
Lateral velocity error determination for lunar module descent guidance radar
Topic: NASA Technical Reports Server (NTRS)
Decoherence and dissipation in quantum systems has been studied extensively in the context of Quantum Brownian Motion. Effective decoherence in coarse grained quantum systems has been a central issue in recent efforts by Zurek and by Hartle and Gell-Mann to address the Quantum Measurement Problem. Although these models can yield very general classical phenomenology, they are incapable of reproducing relevant characteristics expected of a local environment on a quantum system, such as the...
Topics: NASA Technical Reports Server (NTRS), BROWNIAN MOVEMENTS, CORRELATION, DISSIPATION, LANGEVIN...
The construction of the Faraday Cup portion of the SWIE instrument on the Wind spacecraft, participation in Mission Operations, and Data Analysis (MO and DA) of observations of the solar wind has been supported by a sequence of grants. This 'final' Report represents work done on Mission Operations and Data Analysis for the Faraday Cup portion of the SWE. The work reported here was supported under NASA Grant NAG5-7359 (OSP 6701100) from June 1998 to October 2001. It should be noted that this...
Topics: NASA Technical Reports Server (NTRS), SOLAR WIND, WIND/GGS SPACECRAFT, NUMERICAL ANALYSIS,...
This catalog is a supplement to the "Five Millennium Canon of Lunar Eclipses. "It includes additional information for each eclipse that could not be included in the original publication because of size limits. The data tabulated for each eclipse include the catalog number, canon plate number, calendar date, Terrestrial Dynamical Time of greatest eclipse, (Delta)T, lunation number, Saros number, eclipse type, Quincena Solar Eclipse parameter, gamma, penumbral and umbral eclipse...
Topics: NASA Technical Reports Server (NTRS), LUNAR ECLIPSES, CATALOGS (PUBLICATIONS), EPHEMERIDES,...
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by NASA Technical Reports Server (NTRS)
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A guide for DADiSP software, intended for use by the Lambda Point Experiment (LPE) Team during and after the United States Microgravity Payload (USMP)-1 mission, is presented. DADiSP is a Data Analysis and Display Software developed and marketed by DSP Development Corporation, Cambridge, Massachusetts. This guide is intended to be used in addition to the DADiSP Worksheet User Manual and Reference Manual which are supplied by the company with the software. Technical support for DADiSP is...
Topics: NASA Technical Reports Server (NTRS), DATA PROCESSING, DATA REDUCTION, MICROGRAVITY APPLICATIONS,...
Intensity correlation of ionizing background at high redshifts is discussed. The intensity correlation function xi(sub j) and the absorption line equivalent width correlation xi(sub 1/W) are discussed.
Topics: NASA Technical Reports Server (NTRS), LYMAN SPECTRA, RED SHIFT, SPECTRAL CORRELATION, SPECTRAL LINE...
The single-stage-to-orbit launch vehicle Antares is a revolutionary concept based on identical modular units, enabling the Antares to efficiently launch communications satellites, as well as heavy payloads, into Earth orbit and beyond. The basic unit of the modular system, a single Antares vehicle, is aimed at launching approximately 10,000 kg (22,000 lb) into low Earth orbit (LEO). When coupled with a standard Centaur upper stage, it is capable of placing 4000 kg (8800 lb) into geosynchronous...
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, RESEARCH PROJECTS, SINGLE STAGE TO ORBIT...
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by NASA Technical Reports Server (NTRS)
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Astronauts working on the surface of the moon had to wear liquid-cooled garments under their space suits as protection from lunar temperatures which sometimes reach 250 degrees Fahrenheit. In community service projects conducted by NASA's Ames Research Center, the technology developed for astronaut needs has been adapted to portable cooling systems which will permit two youngsters to lead more normal lives.
Topics: NASA Technical Reports Server (NTRS), GARMENTS, COOLING SYSTEMS, PROTECTION, ASTRONAUTS, MOON,...
On March 22, 2006, the Space Technology 5 (ST5) constellation spacecraft were successfully delivered to orbit by a Pegasus XI, launch vehicle. An unexpected relative motion experienced by the constellation after orbit insertion brought about a problem. Soon after launch the observed relative position of the inert rocket body was between the leading and the middle spacecraft within the constellation. The successful planning and execution of an orbit maneuver that would create a fly-by of the...
Topics: NASA Technical Reports Server (NTRS), PEGASUS AIR-LAUNCHED BOOSTER, SPACECRAFT DESIGN, AEROSPACE...
Conference presentation sharing aspects of a computational biology approach to modelling and identification of human physiology.
Topics: NASA Technical Reports Server (NTRS), PHYSIOLOGY, MATHEMATICAL MODELS, BIOENGINEERING, AEROSPACE...
After the events of September 11, 2001, there is an increasing concern of the occurrence of radiological terrorism that may result in significant casualties in densely populated areas. Much effort has been made to establish various biomarkers to rapidly assess radiation dose in mass-casualty and population-monitoring scenarios, which are demanded for effective medical management and treatment of the exposed victims. Among these the count of lymphocytes in peripheral blood and their depletion...
Topics: NASA Technical Reports Server (NTRS), LYMPHOCYTES, NUCLEAR WARFARE, RADIATION THERAPY, BIOLOGICAL...
Z-pinch and Dense Plasma Focus (DPF) are two promising techniques for bringing fusion power to the field of in-space propulsion. A design team comprising of engineers and scientists from UAHuntsville, NASA's George C. Marshall Space Flight Center and the University of Wisconsin developed concept vehicles for a crewed round trip mission to Mars and an interstellar precursor mission. Outlined in this paper are vehicle concepts, complete with conceptual analysis of the mission profile, operations,...
Topics: NASA Technical Reports Server (NTRS), DENSE PLASMAS, PLASMA FOCUS, ZETA PINCH, NUCLEAR FUSION,...
One of the legacies of the samples collected by the Apollo and Luna missions is the link forged between radiometric ages of rocks and relative ages according to stratigraphic relationships and impact crater size-frequency distributions. Our current understanding of the history of the inner solar system is based on the relative chronology of individual planets, tied to the absolute geochronology of the Moon via these important samples. Sample ages have enabled us to infer that impact-melt...
Topics: NASA Technical Reports Server (NTRS), CHRONOLOGY, BRECCIA, CRATERS, METAMORPHISM (GEOLOGY), LUNAR...
A combination of ab initio, atomistic and finite element methods (FEM) were used to investigate the structures, energetics and lattice thermal conductance of grain boundaries for the ultra high temperature ceramic ZrB2. Atomic models of idealized boundaries were relaxed using density functional theory. Information about bonding across the interfaces was determined from the electron localization function. The Kapitza conductance of larger scale versions of the boundary models were computed using...
Topics: NASA Technical Reports Server (NTRS), GRAIN BOUNDARIES, MULTISCALE MODELS, ZIRCONIUM, BORIDES,...
In a cyclical heat load environment such as low Lunar orbit, a spacecraft's radiators are not sized to reject the full heat load requirement. Traditionally, a supplemental heat rejection device (SHReD) such as an evaporator or sublimator is used to act as a "topper" to meet the additional heat rejection demands. Utilizing a Phase Change Material (PCM) heat exchanger (HX) as a SHReD provides an attractive alternative to evaporators and sublimators as PCM HXs do not use a consumable,...
Topics: NASA Technical Reports Server (NTRS), SYSTEMS ANALYSIS, WATER, TEMPERATURE CONTROL, LOADS (FORCES),...
We present a multi-wavelength analysis of three compact galaxy groups, Hickson compact groups (HCGs) 16, 22, and 42, which describe a sequence in terms of gas richness, from space- (Swift, Hubble Space Telescope (HST), and Spitzer) and ground-based (Las Campanas Observatory and Cerro Tololo Inter-American Observatory) imaging and spectroscopy.We study various signs of past interactions including a faint, dusty tidal feature about HCG 16A, which we tentatively age-date at
Topics: NASA Technical Reports Server (NTRS), GALACTIC CLUSTERS, DWARF GALAXIES, IMAGING TECHNIQUES,...
A graphic presentation of the aerothermodynamics analysis conducted in support of the STS-107 accident investigation. Investigation efforts were conducted as part of an integrated AATS team (Aero, Aerothermal, Thermal, Stress) directed by OVEWG. Graphics presented are: STS-107 Entry trajectory and timeline (1st off-nominal event to Post-LOS); Indications from OI telemetry data; Aero/aerothermo/thermal analysis process; Selected STS-107 side fuselage/OMS pod off-nominal temperatures; Leading...
Topics: NASA Technical Reports Server (NTRS), SPACE TRANSPORTATION SYSTEM, ACCIDENT INVESTIGATION,...
Design of single-stage turbine for rotor entering at supersonic speed - performance characteristics
Topic: NASA Technical Reports Server (NTRS)
The braid at each end of a standard electric cable puller is modified to reinforce high pressure, flexible, fluid transfer hoses. This safety device acts as a restraint if the line ruptures.
Topic: NASA Technical Reports Server (NTRS)
Analytical method artificial satellite lifetime determination
Topic: NASA Technical Reports Server (NTRS)
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Solar cells and mesa diodes were fabricated by the implantation of zinc or beryllium ions into n-type gallium arsenide. Annealing temperatures above 750 C (zinc) or 650 C (beryllium) were found to produce 50% to 100% activation of the implanted ions. Junction depths of about 0.4 micron were produced by 600 keV zinc implants or 70 keV beryllium implants. P-layer sheet resistance was about 150 ohms for 2 x 10 to the 15th power cm/2 zinc or 1 x 10 to the 15th power cm/2 beryllium implants. This is...
Topics: NASA Technical Reports Server (NTRS), ADDITIVES, BERYLLIUM, GALLIUM ARSENIDES, SOLAR CELLS, ZINC,...
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The development of an internal insulation system for cryogenic liquids is described. The insulation system is based on a gas layer concept in which capillary or surface tension effects are used to maintain a stable gas layer within a cellular core structure between the tank wall and the contained cryogen. In this work, a 1.8 meter diameter tank was insulated and tested with liquid hydrogen. Ability to withstand cycling of the aluminum tank wall to 450 K was a design and test condition.
Topics: NASA Technical Reports Server (NTRS), CRYOGENIC FLUID STORAGE, INSULATION, LIQUID HYDROGEN,...
A theoretical approach based on the geometrical theory of diffraction is used to study the electromagnetic radiation from a narrow slot in a dielectric-covered perfectly-conducting surface terminated at an edge. The total far-zone field is composed of a geometrical optics field and a diffracted field. The geometrical optics field is the direct radiation from the slot to the field point. The slot also generates surface waves which are incident at the termination of the dielectric cover, where...
Topics: NASA Technical Reports Server (NTRS), ANTENNAS, DIELECTRICS, RADIATION, AIRCRAFT ANTENNAS,...
Until the recent dissolution of the Soviet Union, the Communist Party exerted a strict control of access to and dissemination of scientific and technical information (STI). This article presents models of the Soviet-style information society and the Western-style information society and discusses the effects of centralized governmental control of information on Russian technical communication practices. The effects of political control on technical communication are then used to interpret the...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENGINEERING, AEROSPACE TECHNOLOGY TRANSFER,...
We discuss possible secondary scientific results obtainable with the FRESIP satellite in regards to surface features on solar-like stars.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, DOPPLER RADAR, DWARF STARS, LATE...