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NASA Network Resource and Training Site
Dec 22, 2021 NASA Technical Reports Server (NTRS)
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Topics: Jarvis, Sarah, Kim, Han, Leidos, Inc., MEI Technologies, Inc., NASA Johnson Space Center, Young,...
NASA Network Resource and Training Site
Jul 7, 2019 NASA Technical Reports Server (NTRS)
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Coronal mass ejections (CMEs) and high-speed solar wind streams (HSS) are two solar phenomena that produce large-scale structures in the interplanetary (IP) medium. CMEs evolve into interplanetary CMEs (ICMEs) and the HSS result in corotating interaction regions (CIRs) when they interact with preceding slow solar wind. CMEs and CIRs originate from closed (active region and filament region) and open (corona) hole) magnetic field regions on the Sun, respectively. These two types of mass emissions...
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Topics: NASA Technical Reports Server (NTRS), CORONAL MASS EJECTION, ENVIRONMENT EFFECTS, SOLAR ACTIVITY,...
NASA Network Resource and Training Site
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NASA's In-Space Propulsion Technology Program is investing in technologies that have the potential to revolutionize the robotic exploration of deep space. For robotic exploration and science missions, increased efficiencies of future propulsion systems are critical to reduce overall life-cycle costs and, in some cases, enable missions previously considered impossible. Continued reliance on conventional chemical propulsion alone will not enable the robust exploration of deep space - the maximum...
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Topics: NASA Technical Reports Server (NTRS), SPACECRAFT PROPULSION, TECHNOLOGY ASSESSMENT, NASA PROGRAMS,...
Studies over the last decade have shown radioisotope-based nuclear electric propulsion to be enhancing and, in some cases, enabling for many potential robotic science missions. Also known as radioisotope electric propulsion (REP), the technology offers the performance advantages of traditional reactor-powered electric propulsion (i.e., high specific impulse propulsion at large distances from the Sun), but with much smaller, affordable spacecraft. Future use of REP requires development of...
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Topics: NASA Technical Reports Server (NTRS), NUCLEAR ELECTRIC PROPULSION, HALL THRUSTERS, ION ENGINES,...
Ring current effect on boundary of geomagnetic field in solar wind
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Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
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Bibliography of aeronautical engineering with abstracts
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Topic: NASA Technical Reports Server (NTRS)
This bibliography lists 295 reports, articles, and other documents introduced into the NASA Scientific and Technical Information System in August 1978.
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Topics: NASA Technical Reports Server (NTRS), AERODYNAMICS, AERONAUTICAL ENGINEERING, AERONAUTICS, AIRCRAFT...
NASA Network Resource and Training Site
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This Program User's Guide discusses the Nuclear Thermal Propulsion (NTP) engine system design features and capabilities modeled in the Nuclear Engine System Simulation (NESS): Version 2.0 program (referred to as NESS throughout the remainder of this document), as well as its operation. NESS was upgraded to include many new modeling capabilities not available in the original version delivered to NASA LeRC in Dec. 1991, NESS's new features include the following: (1) an improved input format; (2)...
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Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, NUCLEAR ENGINE FOR ROCKET VEHICLES,...
Studies were conducted to develop appropriate space shuttle electrical power distribution and control (EPDC) subsystem simulation models and to apply the computer simulations to systems analysis of the EPDC. A previously developed software program (SYSTID) was adapted for this purpose. The following objectives were attained: (1) significant enhancement of the SYSTID time domain simulation software, (2) generation of functionally useful shuttle EPDC element models, and (3) illustrative...
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Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ELECTRIC EQUIPMENT, ELECTRIC POWER...
A narrow-beam (1 degree beamwidth), multi-channel (20 to 30 and 89 GHz), polarized (89 vertical and horizontal) radiometer with full azimuth and elevation scanning capabilities has been built with the purpose of improving the detection of in-flight icing hazards to aircraft in the near airport environment. This goal was achieved by co-locating the radiometer with Colorado State University's CHILL polarized Doppler radar and taking advantage of similar beamwidth and volume scan regiments. In...
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Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ICING, DOPPLER RADAR, RADIOMETERS, AVIATION...
NASA Network Resource and Training Site
Dec 3, 2016 NASA Technical Reports Server (NTRS)
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Linea Research Corporation has developed a wearable noninvasive monitor that provides continuous blood pressure and heart rate measurements in extreme environments. Designed to monitor the physiological effects of astronauts' prolonged exposure to reduced-gravity environments as well as the effectiveness of various countermeasures, the device offers wireless connectivity to allow transfer of both real-time and historical data. It can be modified to monitor the health status of astronaut crew...
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Topics: NASA Technical Reports Server (NTRS), BLOOD PRESSURE, PRESSURE MEASUREMENT, HEART RATE, MONITORS,...
The Space Power Architecture Study (SPAS) identified and evaluated power subsystem options for multimegawatt electric (MMWE) space based weapons and surveillance platforms for the Strategic Defense Initiative (SDI) applications. Steady state requirements of less than 1 MMWE are adequately covered by the SP-100 nuclear space power program and hence were not addressed in the SPAS. Four steady state power systems less than 1 MMWE were investigated with little difference between them on a mass...
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Topics: NASA Technical Reports Server (NTRS), HYDROGEN OXYGEN FUEL CELLS, SPACE POWER REACTORS, SPACECRAFT...
NASA Network Resource and Training Site
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A method of designing a self-adaptive missile guidance system is presented. The system inputs are assumed to be known in a statistical sense only. Newton's modified Wiener theory is utilized in the design of the system and to establish the performance criterion. The missile is assumed to be a beam rider, to have a g limiter, and to operate over a flight envelope where the open-loop gain varies by a factor of 20. It is shown that the percent of time that missile acceleration limiting occurs can...
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Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
Aug 7, 2016 NASA Technical Reports Server (NTRS)
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The crisis which troubles the world market for liquid fuel in general and for carburants in particular is doubtless one of the most serious ever experienced by modern industry. It is a national crisis of economic and political independence for countries like Italy and France. The solutions suggested for meeting the lack of liquid fuel may be summed up under two general headings: the economical use of the petroleum now available; creation of petroleum substitutes from natural sources within the...
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Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
Aug 5, 2016 NASA Technical Reports Server (NTRS)
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This compilation of the outstanding characteristics of the available aircraft engines of the world was prepared as a compact ready reference for desk use. It does not pretend to be anything but a skeleton outline of the characteristics of engines reported in the technical press as being in either the experimental, development, or production stage.
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Topic: NASA Technical Reports Server (NTRS)
NASA Network Resource and Training Site
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Shoulder-harness and lap-belt restraint system was designed to be worn by individuals of widely different sizes and to permit normal body motion except under sudden deceleration. System is divided into two basic assemblies, lap belt and torso or shoulder harness. Inertia-activated reels immediately lock when seat experiences sudden deceleration.
Topics: NASA Technical Reports Server (NTRS), ACCIDENT PREVENTION, BODY SIZE (BIOLOGY), DECELERATION,...
Aerodynamic characteristics of HL-10 reentry vehicle model at subsonic and supersonic speeds
Topic: NASA Technical Reports Server (NTRS)
The temporal development of the latitudinal position of the 600 km midlatitude electron density trough at dawn and dusk during the period 25-27 May 1967, which encompassed a large magnetic storm, was measured by the RF capacitive probe on the polar orbiting Ariel 3 satellite. The substorm-related changes in the L coordinate of the trough minimum and the point of most rapid change of density gradient on the low latitude side of the trough are similar. Oscillations of the trough position at dusk...
Topics: NASA Technical Reports Server (NTRS), ARIEL 3 SATELLITE, CAPACITORS, ELECTRON DENSITY...
Spectral measurements of six cosmic gamma-ray bursts in the energy region of 0.1 to 1.2 MeV, made using a semi-omnidirectional X-ray detector on IMP-6 are reported. These measurements confirm the hard X-ray or gamma-ray nature of the bursts, as inferred from the original observations by Klebesadel et al., (1973), and show that their maximum energy release is in this several hundred keV region. Each burst consists of several 1 or 2-second pulses each with the characteristic spectrum of...
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, ENERGY SPECTRA, GAMMA RAYS, X RAYS, BURSTS, LINE...
Topics: NASA Technical Reports Server (NTRS), CAVITATION FLOW, THERMODYNAMICS, COOLING, ENTRAINMENT, HEAT...
The spectrum of electrostatic plasma waves in the terrestrial magnetosheath was studied using the plasma wave experiment on the IMP-6 satellite. Electrostatic plasma wave turbulence is almost continuously present throughout the magnetosheath with broadband (20 Hz- 70 kHz) r.m.s. field intensities typically 0.01 - 1.0 millivolts/m. Peak intensities of about 1.0 millivolts/m near the electron plasma frequency (30 - 60 kHz) were detected occasionally. The components usually identified in the...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, ELECTROSTATIC WAVES, MAGNETOSHEATH,...
Failure detection and substitution of a spare module is provided in a system having a plurality of phase staggered modules connected in parallel to deliver regulated voltage from an unregulated source. Phase control signals applied to the active converter modules are applied to the spare module through NOR gates associated with and disabled by the power output of respective modules such that failure of any one enables its phase control signal to be applied to the spare module, thus controlling...
Topics: NASA Technical Reports Server (NTRS), ELECTRONIC MODULES, PHASE DETECTORS, VOLTAGE CONVERTERS (DC...
The conference focused on four main areas of investigation: laboratory studies and stratospheric chemistry and constituents, sources for and chemical budget of stratospheric halogen compounds, sources for and chemical budget of stratospheric nitrous oxide, and the dynamics of decision making on regulation of potential pollutants of the stratosphere. Abstracts of the scientific sessions of the conference as well as complete transcriptions of the panel discussions on sources for an atmospheric...
Topics: NASA Technical Reports Server (NTRS), AIR POLLUTION, ATMOSPHERES, CONFERENCES, CONTAMINANTS,...
Data compression will pay an increasingly important role in the storage and transmission of image data within NASA science programs as the Earth Observing System comes into operation. It is important that the science data be preserved at the fidelity the instrument and the satellite communication systems were designed to produce. Lossless compression must therefore be applied, at least, to archive the processed instrument data. In this paper, we present an analysis of the performance of...
Topics: NASA Technical Reports Server (NTRS), DATA COMPRESSION, DIFFERENTIAL PULSE CODE MODULATION,...
This document describes the second version of the simulated SeaWiFS data set. A realistic simulated data set is essential for mission readiness preparations and can potentially assist in all phases of ground support for a future mission. The second version improves on the first version primarily through additional realism and complexity. This version incorporates a representation of virtually every aspect of the flight mission. Thus, it provides a high-fidelity data set for testing several...
Topics: NASA Technical Reports Server (NTRS), DATA ACQUISITION, DATA PROCESSING, IMAGES, NAVIGATION,...
CONFIG 3 is a prototype software tool that supports integrated conceptual design evaluation from early in the product life cycle, by supporting isolated or integrated modeling, simulation, and analysis of the function, structure, behavior, failures and operation of system designs. Integration and reuse of models is supported in an object-oriented environment providing capabilities for graph analysis and discrete event simulation. Integration is supported among diverse modeling approaches...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, SOFTWARE DEVELOPMENT TOOLS, DESIGN...
Developed by Jonathan Lee, a structural materials engineer at Marshall Space Flight Center, and PoShou Chen, a scientist with Huntsville, Alabama-based Morgan Research Corporation, MSFC-398 is a high-strength aluminum alloy able to operate at high temperatures. MSFC-398 was licensed for marine applications by Bombardier Recreational Products Inc., and is now found in the complete line of Evinrude E-TEC outboard motors, a line of two-stroke motors that maintain the power and dependability of a...
Topics: NASA Technical Reports Server (NTRS), HIGH STRENGTH ALLOYS, MARINE TECHNOLOGY, HEAT RESISTANT...
We report results from 50 days of data accumulated in two Antarctic flights of the Trans-Iron Galactic Element Recorder (TIGER). With a detector system composed of scintillators, Cherenkov detectors, and scintillating optical fibers, TIGER has a geometrical acceptance of 1.7 sq m sr and a charge resolution of 0.23 cu at Iron. TIGER has obtained abundance measurements of some of the rare galactic cosmic rays heavier than iron, including Zn, Ga, Ge, Se, and Sr, as well as the more abundant...
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, COSMIC DUST, INTERSTELLAR MATTER, STAR CLUSTERS,...
Modifications of the basic Shockley equations that result from the random and nonrandom spatial variations of the chemical composition of a semiconductor were developed. These modifications underlie the existence of the extensive emitter recombination current that limits the voltage over the open circuit of solar cells. The measurement of parameters, series resistance and the base diffusion length is discussed. Two methods are presented for establishing the energy bandgap narrowing in the...
Topics: NASA Technical Reports Server (NTRS), CURRENT DISTRIBUTION, ELECTRICAL MEASUREMENT, P-N JUNCTIONS,...
An analytical program is in progress at Rockwell International to revise wing leading edge heating predictions in order to improve correlation with STS-1 to -5 flight radiometer data. This paper discusses the methods that have been used to improve agreement between prediction and flight and summarizes the aerodynamic correlations which, when updated, will be used to analyze future orbiter missions.
Topics: NASA Technical Reports Server (NTRS), AEROTHERMODYNAMICS, COMPUTER PROGRAMS, CORRELATION, HEATING,...
This fourth monthly progress report again contains corrections and additions to the previously submitted reports. The additions include a simplified SRB model that is directly incorporated into the estimation algorithm and provides the required partial derivatives. The resulting partial derivatives are analytical rather than numerical as would be the case using the SOBER routines. The filter and smoother routine developments have continued. These routines are being checked out.
Topics: NASA Technical Reports Server (NTRS), DATA SMOOTHING, GROUND SUPPORT EQUIPMENT, KALMAN FILTERS,...
Coherent anti-Stokes Raman scattering (CARS) from the pure rotational Raman lines of N2 is employed to measure the instantaneous (approximately 10 ns) rotational temperature of N2 gas at room temperature and below with good spatial resolution (0.2 x 0.2 x 3.0 cu mm). A broad bandwidth dye laser is used to obtain the entire rotational spectrum from a single laser pulse; the CARS signal is then dispersed by a spectrograph and recorded on an optical multichannel analyzer. A best fit temperature is...
Topics: NASA Technical Reports Server (NTRS), GAS TEMPERATURE, NITROGEN, RAMAN SPECTRA, TEMPERATURE...
The influence of inelastic material models on computed stress-strain states, and therefore predicted lives, was studied for thermomechanically loaded structures. Nonlinear structural analyses were performed on a fatigue specimen which was subjected to thermal cycling in fluidized beds and on a mechanically load cycled benchmark notch specimen. Four incremental plasticity creep models (isotropic, kinematic, combined isotropic-kinematic, combined plus transient creep) were exercised. Of the...
Topics: NASA Technical Reports Server (NTRS), FATIGUE (MATERIALS), GAS TURBINE ENGINES, MATHEMATICAL...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Optical sensors aboard Earth orbiting satellites such as the next generation Visible/Infrared Imager/Radiometer Suite (VIIRS) assume that the sensors radiometric response in the Reflective Solar Bands (RSB) is described by a quadratic polynomial, in relating the aperture spectral radiance to the sensor Digital Number (DN) readout. For VIIRS Flight Unit 1, the coefficients are to be determined before launch by an attenuation method, although the linear coefficient will be further determined...
Topics: NASA Technical Reports Server (NTRS), INFRARED RADIOMETERS, MAXIMUM LIKELIHOOD ESTIMATES, SOLAR...
In the wake of the closure of the Indiana University Cyclotron Facility (IUCF), this presentation provides an overview of the options for North American proton facilities. This includes those in use by the aerospace community as well as new additions from the cancer therapy regime. In addition, proton single event testing background is provided for understanding the criteria needed for these facilities for electronics testing.
Topics: Aerospace Corp., Boeing Co., Davis, Scott, Foster Consulting Services, LLC, Foster, Charles,...
Multi-person teams are sometimes responsible for critical tasks, such as flying an airliner. Here we present a method using gaze tracking data to assess shared visual attention, a term we use to describe the situation where team members are attending to a common set of elements in the environment. Gaze data are quantized with respect to a set of N areas of interest (AOIs); these are then used to construct a time series of N dimensional vectors, with each vector component representing one of the...
Topics: Mulligan, Jeffrey B., NASA Ames Research Center
Highly siderophile elements (HSE = Au, Re, and the Pt-group elements) are tracers of silicate / metal interactions during planetary processes. Since most core-formation models involve some state of equilibrium between liquid silicate and liquid metal, understanding the partioning of highly siderophile elements (HSE) between silicate and metallic melts is a key issue for models of core / mantle equilibria and for core formation scenarios. However, partitioning models for HSE are still inaccurate...
Topics: Case Western Reserve Univ., Chicago Univ., Lanziroti, A., Lunar and Planetary Inst., Martin, A. M.,...
The Mars Science Laboratory (MSL) Curiosity Rover carries a suite of instruments, one of which is the Sample Analysis at Mars (SAM) experiment. SAM is devoted to the in situ molecular analysis of gases evolving from solid samples collected by Curiosity on Mars surface/sub-surface. Among its three analytical devices, SAM has a gaschromatograph coupled to a quadrupole mass spectrometer (GC-QMS). The GC-QMS is devoted to the separation and identification of organic and inorganic material. Before...
Topics: Archer, P. D., Jr., Belmahdi, I., Buch, A., Coll, P., Freissinet, C., Glavin, D. P., Institut...
Performance index includes a model representing linear control-system design specifications. Based on a geometric criterion for approximation of the model by the actual system, the index can be interpreted directly in terms of the desired system response model without actually having the model's time response.
Topic: NASA Technical Reports Server (NTRS)
Laser generated plasma as spectroscopic light source
Topic: NASA Technical Reports Server (NTRS)
Real-time auxiliary computing facility for operational support of Apollo 5 flight
Topic: NASA Technical Reports Server (NTRS)
Multisample test chamber for exposing materials to X rays, temperature change, and gaseous conditions and determination of material effects
Topic: NASA Technical Reports Server (NTRS)
No abstract available
Topics: NASA Technical Reports Server (NTRS), BONE MINERAL CONTENT, MANNED SPACE FLIGHT, MICROGRAVITY,...
With high incomes, long commutes, severe ground geographic constraints, severe highway congestion during peak commute times, high housing costs, and near perfect year-round weather, the Silicon Valley is positioned to be an excellent early adopter market for emerging aviation On-Demand Mobility transportation solutions. Prior efforts have attempted to use existing aviation platforms (helicopters or General Aviation aircraft) with existing infrastructure solutions, or only investigated new...
Topics: Antcliff, Kevin R., Goodrich, Kenneth H., Moore, Mark D., NASA Langley Research Center
The Miles equation has long been used to predict slosh damping in liquid propellant tanks due to ring baffles. The original work by Miles identifies defined limits to its range of application. Recent evaluations of the Space Launch System identified that the Core Stage baffle designs resulted in violating the limits of the application of the Miles equation. This paper describes the work conducted by NASA/MSFC to develop methods to predict slosh damping from ring baffles for conditions for which...
Topics: Brodnick, Jacob, Computational Fluid Dynamics Research Corp., Jacobs Technology, Inc., NASA...
Cell and animal studies conducted onboard the International Space Station and formerly on Shuttle flights have provided groundbreaking data illuminating the deleterious biological response of bone to mechanical unloading. However the intercellular communicative mechanisms associated with the regulation of bone synthesis and bone resorption cells are still largely unknown. Connexin-43 (CX43), a gap junction protein, is hypothesized to play a significant role in osteoblast and osteocyte...
Topics: Almeida, E. A. C., Blaber, E. A., Juran, C. M., NASA Ames Research Center, Universities Space...
The risk of severe wildfires in Texas has been related to weather phenomena such as climate change and recent urban expansion into wild land areas. During recent years, Texas wild land areas have experienced sequences of wet and dry years that have contributed to increased wildfire risk and frequency. To prevent and contain wildfires, the Texas Forest Service (TFS) is tasked with evaluating and reducing potential fire risk to better manage and distribute resources. This task is made more...
Topics: 31abd33a97bc4e508754b7a5b4654275, Brooke, Michael, Fenn, Teresa, Science Systems and Applications,...
Hybrid composite gears have been investigated as a weight saving technology for rotorcraft transmissions. These gears differ from conventional steel gears in that the structural material between the shaft interface and the gear rim is replaced with a lightweight carbon fiber composite. The work discussed here is an extension of previous coupon level hybrid gear tests to a full-scale bull gear. The NASA Glenn Research Center High-Speed Helical Gear Rig was modified for this program, allowing...
Topics: Army Research Lab., Handschuh, Robert F., Laberge, Kelsen E., NASA Glenn Research Center, Roberts,...
No abstract available
Topics: Fry, D., NASA Johnson Space Center
As one of its activities as an Analysis Center in the International GPS Service (IGS), the Jet Propulsion Laboratory (JPL) uses data from a globally distributed network of geodetic-quality GPS receivers to estimate precise clock solutions, relative to a chosen reference, for both the GPS satellites and GPS receiver internal clocks, every day. The GPS constellation and ground network provide geometrical strength resulting in formal errors of about 100 p sec for these estimates. Some of the...
Topics: NASA Technical Reports Server (NTRS), CLOCKS, ERRORS, HIGH FREQUENCIES, COMPUTER NETWORKS,...
Ionization of lower ionosphere by bremsstrahlung from auroral electron flux
Topic: NASA Technical Reports Server (NTRS)
Implementation bias in a specification is an arbitrary constraint in the solution space. This paper describes the problem of bias. Additionally, this paper presents a model of the specification and design processes describing individual subprocesses in terms of precision/detail diagrams and a model of bias in multi-attribute software specifications. While studying how bias is introduced into a specification we realized that software defects and bias are dual problems of a single phenomenon....
Topics: NASA Technical Reports Server (NTRS), BIAS, COMPUTER PROGRAMMING, COMPUTER PROGRAMS, DEFECTS,...
Modifications to an existing three-dimensional, implicit, upwind Euler/Navier-Stokes code (CFL3D Version 2.1) for the aeroelastic analysis of wings are described. These modifications, which were previously added to CFL3D Version 1.0, include the incorporation of a deforming mesh algorithm and the addition of the structural equations of motion for their simultaneous time-integration with the government flow equations. The paper gives a brief description of these modifications and presents...
Topics: NASA Technical Reports Server (NTRS), AEROELASTICITY, BOUNDARY VALUE PROBLEMS, EULER EQUATIONS OF...
The Indian National Satellite (INSAT) 2A and 2B have deployment mechanisms for deploying the solar array, two C/S band antenna reflectors and a coilable lattice boom with sail. The mechanisms have worked flawlessly on both satellites. The configuration details, precautions taken during the design phase, the test philosophy, and some of the critical analysis activities are discussed.
Topics: NASA Technical Reports Server (NTRS), ANTENNA ARRAYS, INDIAN SPACECRAFT, REFLECTOR ANTENNAS, SOLAR...
Based on previous observations of glaze ice accretion on aircraft surfaces, a multizone model with distinct zones of different surface roughness is demonstrated. The use of surface roughness in the LEWICE ice accretion prediction code is examined. It was found that roughness is used in two ways: (1) to determine the laminar to turbulent boundary-layer transition location; and (2) to calculate the convective turbulent heat-transfer coefficient. A two-zone version of the multizone model is...
Topics: NASA Technical Reports Server (NTRS), CONVECTIVE HEAT TRANSFER, FLOW DISTRIBUTION, GLAZES, ICE, ICE...
This paper addresses the issue of integrating the C Language Integrated Production System (CLIPS) into distributed data acquisition environments. In particular, it presents preliminary results of some ongoing software development projects aimed at exploiting CLIPS technology in the new mission control center (MCC) being built at NASA Johnson Space Center. One interesting aspect of the control center is its distributed architecture; it consists of networked workstations which acquire and share...
Topics: NASA Technical Reports Server (NTRS), C (PROGRAMMING LANGUAGE), COMPUTER NETWORKS, EXPERT SYSTEMS,...
Astronauts frequently use a variety of hand tools during space missions, especially on repair missions. A toolbox is needed to allow storage and retrieval of tools with minimal difficulties. The toolbox must contain tools during launch, landing, and on-orbit operations. The toolbox will be used in the Shuttle Bay and therefore must withstand the hazardous space environment. The three main functions of the toolbox in space are: to protect the tools from the space environment and from damaging...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENVIRONMENTS, ASTRONAUTS, DESIGN ANALYSIS, HUMAN...
The conference sprang from discussions on the current climate that women face in science, mathematics, engineering, and technology. The conference (and this document) is a beginning, not a culmination, of women's learning leadership skills. Conferees were active, articulate, energetic, and ready to learn leadership qualities, some of which seem universal, others that appear to require skills in specific fields. After the introduction, the workshops and presentations are arranged under vision...
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, FEMALES, TECHNOLOGIES, EDUCATION, ENGINEERING,...
The 15th Electromagnetic and Light Scattering Conference (ELS-XV) was held in Leipzig, Germany from 21 to 26 of June 2015. This conference built on the great success of the previous meetings held in Amsterdam (1995), Helsinki(1997) [2], New York City(1998) [3], Vigo (1999),Halifax (2000), Gainesville (2002), Bremen (2003), Salobreña (2005), St. Petersburg (2006), Bodrum (2007), Hatfield (2008), Helsinki (2010), Taormina (2011), and Lille as well as the workshops held in Bremen (1996,1998) and...
Topics: Leibniz Inst. for Tropospheric Research, Macke, Andreas, Mishchenko, Michael I., NASA Goddard Inst....
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No abstract available
Topics: Colsa Corp., Wade, Gina
Apatite is a common mineral in terrestrial, planetary, and asteroidal materials. It is commonly used for geochronology (U-Pb), sensing volatiles (H, F, Cl, S), and can concentrate rare earth elements (REE) during magmatic fractionation and in general. Some recent studies have shown that some kinds of phosphate may fractionate Hf and W and that Mn may be redox sensitive. Experimental studies have focused on REE and other lithophile elements and at simplified or not specified oxygen fugacities....
Topics: Humayun, M., NASA Johnson Space Center, National High Magnetic Field Lab., Righter, K., Yang, S.
No abstract available
Topics: Brown, Tom, Iannello, Chris, NASA Langley Research Center
There is both an art and a science to systems engineering. The science of systems engineering is effectively captured in processes and procedures, but the art is much more elusive. We propose that there is six step process that can be applied to any systems engineering organization to create an environment from which the \"art\" of that organization can be captured, be allowed to evolve collaboratively and be shared with all members of the organization. This paper details this process...
Topics: Embry-Riddle Aeronautical Univ., NASA Kennedy Space Center, Owens, Clark V., III, Roumie, Yasmeen,...
Conduct research, development and testing to identify airspace operations requirements to enable large-scale visual and beyond visual line of sight UAS operations in the low-altitude airspace.
Topics: Kopardekar, Parimal H., NASA Ames Research Center
Apollo mission 11 trajectory reconstruction and postflight analysis
Topic: NASA Technical Reports Server (NTRS)
Electron beam deflection electric field meter for ALSEP experiments package
Topic: NASA Technical Reports Server (NTRS)
Flutter analysis for thin lifting surfaces by application of supersonic kernel function procedure
Topic: NASA Technical Reports Server (NTRS)
Method for producing alternating ether-siloxane copolymers with stable properties when exposed to elevated temperatures and UV radiation
Topic: NASA Technical Reports Server (NTRS)
An investigation has been made to determine the effects of noise on human performance. Fourteen subjects performed a memory-decision-response task in relative quiet and while listening to tape recorded noises. Analysis of the data obtained indicates that performance was degraded in the presence of noise. Significant increases in problem solution times were found for impulsive noise conditions as compared with times found for the no-noise condition. Performance accuracy was also degraded....
Topics: NASA Technical Reports Server (NTRS), HUMAN PERFORMANCE, HUMAN REACTIONS, NOISE (SOUND), DECISION...
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A computer program called Character String Scanner (CSS), is presented. It is designed to search a data set for any specified group of characters and then to flag this group. The output of the CSS program is a listing of the data set being searched with the specified group of characters being flagged by asterisks. Therefore, one may readily identify specific keywords, groups of keywords or specified lines of code internal to a computer program, in a program output, or in any other specific data...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DATA RETRIEVAL, CODING, EDITING, OUTPUT,...
Two groups of anesthetized, fasted pigs were utilized. One group of 13 animals (8.5 to 16.6 kilograms) was exposed to a high-pressure environment, and the other group of eight animals (6.9 to 20.0 kilograms) constituted the control group. The experimental group was subjected to an atmosphere of 90 percent nitrogen and 10 percent oxygen at a pressure of 50 psig for 30 minutes and then decompressed at a rate 10 psi/min. Plasma volumes, using both iodine-125-tagged-albumin and...
Topics: NASA Technical Reports Server (NTRS), BODY FLUIDS, DECOMPRESSION SICKNESS, PULMONARY FUNCTIONS,...
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), DATA REDUCTION, IMAGERY, MULTISPECTRAL BAND SCANNERS, DIGITAL...
An incremental theory and numerical procedure to analyze a three-dimensional thermoelastoplastic structure subjected to high temperature, surface heat flux, and volume heat supply as well as mechanical loadings are presented. Heat conduction equations and equilibrium equations are derived by assuming a specific form of incremental free energy, entropy, stresses and heat flux together with the first and second laws of thermodynamics, von Mises yield criteria and Prandtl-Reuss flow rule. The...
Topics: NASA Technical Reports Server (NTRS), HEAT SHIELDING, THERMAL CONTROL COATINGS, THERMAL PROTECTION,...