0
0.0
Aug 25, 2016
08/16
Aug 25, 2016
by
Anupama Gowda, Pavan Kumar
texts
eye 0
favorite 0
comment 0
Educators have long-standing experience using FabLabs in many parts of the globe. In India FabLabs are at a nascent stage and available for a small community of informed users, mostly in urban settings. Workbench Projects (WP), a young FabLab/Makerspace in Bangalore, made its first headway working with a select group of government school ‘theatre teachers’ under its pilot initiative of the Fab Educators Programme. Teachers became the ground zero of this project because they represent a...
Topics: STEAM Education, Models For Fab 2.0, Rural Fab 2.0, Teacher Training Programs, Project Based...
0
0.0
Aug 25, 2016
08/16
Aug 25, 2016
texts
eye 0
favorite 0
comment 0
The trimming scheme with a prefixed cutoff portion is known as a method of improving the robustness of statistical models such as multivariate Gaussian mixture models (MG-MMs) in small scale tests by alleviating the impacts of outliers. However, when this method is applied to real-world data, such as noisy speech processing, it is hard to know the optimal cut-off portion to remove the outliers and sometimes removes useful data samples as well. In this paper, we propose a new method based on...
Topics: Gaussian Mixture Models, K-means, Trimmed K-means, Speech Processing
0
0.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
Hover and forward flight tests were conducted to investigate the mutual aerodynamic interaction between the main motor and fuselage of a conventional helicopter configuration. A 0.15-scale Model 222 two-bladed teetering rotor was combined with a 0.15-scale model of the NASA Ames 40x80-foot wind tunnel 1500 horsepower test stand fairing. Configuration effects were studied by modifying the fairing to simulate a typical helicopter forebody. Separation distance between rotor and body were also...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC INTERFERENCE, AIRCRAFT CONFIGURATIONS, FUSELAGES,...
4
4.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 4
favorite 0
comment 0
Presentations were made concerning the hot section environment and behavior of combustion liners, turbine blades, and waves. The presentations were divided into six sessions: instrumentation, combustion, turbine heat transfer, structural analysis, fatigue and fracture, and surface properties. The principal objective of each session was to disseminate research results to date, along with future plans. Topics discussed included modeling of thermal and fluid flow phenomena, structural analysis,...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ENGINES, AIRFOILS, CONFERENCES, LIFE (DURABILITY),...
1
1.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
The major technical tasks that led to the definitions of operational and demonstration multiple beam antenna (MBA) flight systems and a proof of concept model (POC) are described. Features of the POC Model and its measured performance are presented in detail. Similar MBA's are proposed for transmitting and receiving with the POC Model representing the 20 GHz transmitting antenna. This POC MBA is a dual shaped-surface reflector system utilizing a movable free array to simulate complete CONUS...
Topics: NASA Technical Reports Server (NTRS), DOWNLINKING, MULTIBEAM ANTENNAS, SATELLITE ANTENNAS,...
3
3.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 3
favorite 0
comment 0
Previous aerodynamic heating tests have been conducted in the AEDC/VKF Supersonic Wind Tunnel (A) to aid in defining the design thermal environment for the space shuttle external tank. The quality of these data has been under discussion because of the effects of low tunnel enthalpy and slow model injection rates. Recently the AEDC/VKF Hypersonic Wind Tunnel (C) has been modified to provide a Mach 4 capability that has significantly higher tunnel enthalpy with more rapid model injection rates....
Topics: NASA Technical Reports Server (NTRS), EXTERNAL TANKS, SPACE SHUTTLES, SUPERSONIC TEST APPARATUS,...
1
1.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
The benefits and problems of the use of cold semiconductor electronics and the research and development effort required to bring cold electronics into more widespread use were examined.
Topics: NASA Technical Reports Server (NTRS), CRYSTAL GROWTH, DIELECTRIC PROPERTIES, EFFICIENCY, FIELD...
2
2.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
A semi-empirical model for microwave backscatter from vegetation was developed and a complete set of canope attenuation measurements as a function of frequency, incidence angle and polarization was acquired. The semi-empirical model was tested on corn and sorghum data over the 8 to 35 GHz range. The model generally provided an excellent fit to the data as measured by the correlation and rms error between observed and predicted data. The model also predicted reasonable values of canopy...
Topics: NASA Technical Reports Server (NTRS), BACKSCATTERING, CANOPIES (VEGETATION), MATHEMATICAL MODELS,...
2
2.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Measuring small-signal admittance versus frequency and forward bias voltage together with a new transient measurement apparently provides the most reliable and flexible method available for determining back surface recombination velocity and low-injection lifetime of the quasineutral base region of silicon solar cells. The new transient measurement reported here is called short-circuit-current decay (SCCD). In this method, forward voltage equal to about the open-circuit or the maximum power...
Topics: NASA Technical Reports Server (NTRS), CARRIER INJECTION, ION RECOMBINATION, RECOMBINATION...
2
2.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
The design and performance of pointing and control systems for two space infrared telescope facility vehicles were examined. The need for active compensation of image jitter using the secondary mirror or other optical elements was determined. In addition, a control system to allow the telescope to perform small angle slews, and to accomplish large angle slews at the rate of 15 deg per minute was designed. Both the 98 deg and the 28 deg inclination orbits were examined, and spacecraft designs...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL OBSERVATORIES, POINTING CONTROL SYSTEMS, SPACE...
2
2.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Volume II contains thirty two complete manuscripts and five abstracts. The topics covered include the application of event-related brain potential analysis to operational problems, the subjective evaluation of workload, mental models, training, crew interaction analysis, multiple task performance, and the measurement of workload and performance in simulation.
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, FLIGHT CONTROL, HUMAN FACTORS ENGINEERING, MAN...
2
2.0
Aug 24, 2016
08/16
Aug 24, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
The global biosphere in an exceedingly complex system. To gain an understanding of its structure and dynamic features, it is necessary not only to increase the knowledge about the detailed processes but also to develop models of how global interactions take place. Attempts to analyze the detailed physical, chemical and biological processes in this context need to be guided by an advancement of understanding of the latter. It is necessary to develop a strategy of data gathering that severs both...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, BIOGEOCHEMISTRY, CONFERENCES, ENERGY...
3
3.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 3
favorite 0
comment 0
Mesoscale numerical forecasts utilizing the Mesoscale Atmospheric Simulation System (MASS) are documented for two East Coast severe weather events. The two events are the thunderstorm and heavy snow bursts in the Washington, D.C. - Baltimore, MD region on 8 March 1984 and the devastating tornado outbreak across North and South Carolina on 28 March 1984. The forecasts are presented to demonstrate the ability of the model to simulate dynamical interactions and diabatic processes and to note some...
Topics: NASA Technical Reports Server (NTRS), MESOSCALE PHENOMENA, NUMERICAL WEATHER FORECASTING,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
The role of the Langley Research Center is to engage in the basic and applied research necessary for the advancement of aeronautics and space flight, to enerate new and advanced concepts for the accomplishment of related national goals, and to provide research advice, technological support, and assistance to other NASA installations, other government agencies, and industry. Highlights of the major accomplishments and applications made during the past year are described. The highlights...
Topics: NASA Technical Reports Server (NTRS), AERONAUTICAL ENGINEERING, NASA PROGRAMS, PROJECT MANAGEMENT,...
3
3.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 3
favorite 0
comment 0
Reflected fluxes are calculated for stratocumulus cloud fields as a function of skycover, cloud aspect ratio, and cloud shape. Cloud liquid water volume is held invariant as cloud shape is varied so that the results can be utilized more effectively by general circulation models and climate models. On the basis of required accuracy in the Earth Radiation Budget Experiment program, an order of magnitude value of 10 W/sq m is used to estimate significant differences between plane parallel and...
Topics: NASA Technical Reports Server (NTRS), CLOUD PHYSICS, CUMULUS CLOUDS, MATHEMATICAL MODELS, MONTE...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
A computer model of the Spartan Release Engagement Mechanism (REM) is presented in a series of numerical charts and engineering drawings. A crack growth analysis code is used to predict the fracture mechanics of critical components.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, LATCHES, MATHEMATICAL MODELS,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
A test was conducted in the NASA/Ames Research Center 9x7-foot Supersonic Wind Tunnel to help resolve an anomaly that developed during the STS-6 orbiter flight wherein sections of the Advanced Flexible Reusable Surface Insulation (AFRSI) covering the OMS pods suffered some damage. A one-third scale two-dimensional shell structure model of an OMS pod cross-section was employed to support the test articles. These consisted of 15 AFRSI blanket panels form-fitted over the shell structures for...
Topics: NASA Technical Reports Server (NTRS), COORDINATES, FLOW VISUALIZATION, LOW TEMPERATURE, REUSABLE...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
The following topics relating to solar-terrestrial interactions are considered: (1) reconnection of magnetic fields; (2) particle acceleration; (3) solar magnetic flux; (4) magnetohydrodynamic waves and turbulence in the Sun and interplanetary medium; (5) coupling of the solar wind to the magnetosphere; (6) coronal transients; (7) the connection between the magnetosphere and ionosphere; (8) substorms in the magnetosphere; (9) solar flares and the solar terrestrial environment; (10) shock waves...
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, EARTH IONOSPHERE, GEOMAGNETIC TAIL,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
A single element traction rig was used to measure the traction forces at the contact of a ball against a flat disc at room temperature under combined rolling and sliding. The load and speed conditions were selected to match those anticipated for bearing applications in adiabatic diesel engines. The test program showed that the magnitude of traction forces were almost the same for all the lubricants tested; a lubricant should, therefore, be selected on the basis of its ability to prevent wear of...
Topics: NASA Technical Reports Server (NTRS), BALL BEARINGS, BOUNDARY LUBRICATION, LUBRICANT TESTS, SOLID...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
A nonlinear simulation model of the CH-47B helicopter, was adapted for use in a simulation facility. The model represents the specific configuration of the variable stability CH-47B helicopter. Modeling of the helicopter uses a total force approach in six rigid body degrees of freedom. Rotor dynamics are simulated using the Wheatley-Bailey equations, steady state flapping dynamics and included in the model of the option for simulation of external suspension, slung load equations of motion....
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC CONFIGURATIONS, COMPUTER GRAPHICS, DEGREES OF...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Mutual interferences among geostationary satellite communication systems determine the permitted spacing between satellites and the limits on the capacity of the orbit/spectrum resources available. This paper describes the computer program for analyzing the mutual interferences among communication satellite systems. Capabilities of the program are described. Inputs, models used, program operations, and program outputs are given. To show application of the program, an example scenario is...
Topics: NASA Technical Reports Server (NTRS), COMMUNICATION SATELLITES, COMPUTER PROGRAMS, GEOSYNCHRONOUS...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
The causes and remedies of vibration and subsynchronous whirl problems encountered in the Shuttle Main Engine SSME turbomachinery are analyzed. Because the nonlinear and linearized models of the turbopumps play such an important role in the analysis process, the main emphasis is concentrated on the verification and improvement of these tools. It has been the goal of our work to validate the equations of motion used in the models are validated, including the assumptions upon which they are...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, DESIGN ANALYSIS, ROTARY STABILITY,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
The development, implementation and flight test evaluation of a performance modeling technique which required a limited amount of quasisteady state flight test data to predict the overall one g performance characteristics of an aircraft. The concept definition phase of the program include development of: (1) the relationship for defining aerodynamic characteristics from quasi steady state maneuvers; (2) a simplified in flight thrust and airflow prediction technique; (3) a flight test...
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, EQUILIBRIUM FLOW, FLIGHT TESTS,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Modifications to the Langley Low-Turbulence Pressure Tunnel are presented and a calibration of the mean flow parameters in the test section is provided. Also included are the operational capability of the tunnel and typical test results for both single-element and multi-element airfoils. Modifications to the facility consisted of the following: replacement of the original cooling coils and antiturbulence screens and addition of a tunnel-shell heating system, a two dimensional model-support and...
Topics: NASA Technical Reports Server (NTRS), FLOW CHARACTERISTICS, LAMINAR FLOW, LOW SPEED WIND TUNNELS,...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
The space radiation environment of the TOPEX spacecraft is investigated. A single trajectory was considered. The external (surface incident) charged particle radiation, predicted for the satellite, is determined by orbital flux integration for the specified trajectory. The latest standard models of the environment are used in the calculations. The evaluation is performed for solar maximum conditions. The spacecraft exposure to cosmic rays of galactic origin is evaluated over its flight path...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENVIRONMENTS, COMPUTERIZED SIMULATION, ENVIRONMENT...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
Research activities performed on MAGSAT scalar data over South America, Central America, and the adjacent marine areas are summarized. The geologic utility of magnetic anomalies detected by satellite is demonstrated by focusing on the spherical-Earth interpretation of scalar MAGSAT data in combination with ancillary geological and geophysical data to obtain lithospheric models for these regions related to their contemporary crustal dynamics processes, geologic history, current volcanism...
Topics: NASA Technical Reports Server (NTRS), DATA PROCESSING, EARTH CRUST, LITHOSPHERE, MAGNETIC...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
Parameters which contribute to supersonic jet shock noise were investigated for the purpose of determining means to reduce such noise generation to acceptable levels. Six dual-stream test nozzles with varying flow passage and plug closure designs were evaluated under simulated flight conditions in an anechoic chamber. All nozzles had combined convergent-divergent or convergent flow passages. Acoustic behavior as a function of nozzle flow passage geometry was measured. The acoustic data consist...
Topics: NASA Technical Reports Server (NTRS), ACOUSTIC MEASUREMENT, CONVERGENT-DIVERGENT NOZZLES, FLIGHT...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
The effect of alloying elements on hydrogen solubility were determined by evaluating solubility equations and interaction coefficients. The solubility of dry hydrogen at one atmosphere was investigated in liquid aluminum, Al-Ti, Al-Si, Al-Fe, liquid gold, Au-Cu, and Au-Pd. The design of rapid heating and high pressure casting furnaces used in meta foam experiments is discussed as well as the mechanism of precipitation of pores in melts, and the effect of hydrogen on the shrinkage porosity of...
Topics: NASA Technical Reports Server (NTRS), HYDROGEN EMBRITTLEMENT, LIQUID METALS, NUCLEATION, POROSITY,...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
The fracture resistance and fatigue response of Armco Nitronic 40 austenitic stainless steel were evaluated under cryogenic conditions. Tensile, fracture toughness and fatigue crack growth properties were measured at -275 F. The tensile yield strength was approximately 120 ksi and the fracture toughness was estimated to be 350 ksi-in /2 on the basis of fracture toughness measurements. Testing was conducted to evaluate the behavior of a simulated section of the wing of the Pathfinder 1 model...
Topics: NASA Technical Reports Server (NTRS), AUSTENITIC STAINLESS STEELS, CRACK PROPAGATION, FRACTURE...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
Model calculations for the brightness of the sodium cloud in Region A were performed to clarify the role played by the plasma torus sink in producing the east-west intensity asymmetry observed in the sodium D-lines. It was determined that the east-west electric field, proposed by Barbosa and Kievelson (1983) and Ip and Goertz (1983) to explain the dawn-dusk asymmetry in the torus ion emissions measured by the Voyager UVS instrument, could also produce the east-west sodium intensity asymmetry...
Topics: NASA Technical Reports Server (NTRS), COMETARY ATMOSPHERES, EARTH MAGNETOSPHERE, IO, PLANETARY...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Techniques in computer-aided geometry modeling and their application are addressed. Mathematical modeling, solid geometry models, management of geometric data, development of geometry standards, and interactive and graphic procedures are discussed. The applications include aeronautical and aerospace structures design, fluid flow modeling, and gas turbine design.
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTER GRAPHICS, CONFERENCES,...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
The Global Modeling and Simulation Branch (GMSB) of the Laboratory for Atmospheric Sciences (GLAS) is engaged in general circulation modeling studies related to global atmospheric and oceanographic research. The research activities discussed are organized into two disciplines: Global Weather/Observing Systems and Climate/Ocean-Air Interactions. The Global Weather activities are grouped in four areas: (1) Analysis and Forecast Studies, (2) Satellite Observing Systems, (3) Analysis and Model...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CIRCULATION, ATMOSPHERIC MODELS, ATMOSPHERIC...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
Wind-tunnel tests of a model of an advanced canard configuration designed for general aviation were conducted in the Langley 30- by 60-Foot Tunnel. The objective of the tests was to determine the aerodynamic stability and control characteristics of the configuration for a large range of angles of attack and sideslip at several power conditions. Analysis of the aerodynamic data indicates significant effects of power and of center-of-gravity location. For forward center-of-gravity locations, the...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC STALLING, AIRCRAFT CONFIGURATIONS, FLOW...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Seismograms from 22 earthquakes along the northeast Pacific rim recorded in southern California form the data set for investigation of the upper mantle beneath the Cascade Range-Juan de Fuca region, a transitional area encompassing both very young ocean floor and a continental margin. These data consist of 853 seismograms (6 deg delta 42 deg) which produce 1068 travel times and 40 ray parameter estimates. These data are compared directly to another large suite of records representative of...
Topics: NASA Technical Reports Server (NTRS), CALIFORNIA, EARTH MANTLE, EARTHQUAKES, MAPPING, MATHEMATICAL...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
The various physical processes that occur in the gas turbine combustor and the development of analytical models that accurately describe these processes are discussed. Aspects covered include fuel sprays; fluid mixing; combustion dynamics; radiation and chemistry and numeric techniques which can be applied to highly turbulent, recirculating, reacting flow fields.
Topics: NASA Technical Reports Server (NTRS), COMBUSTION PHYSICS, COMPUTATIONAL FLUID DYNAMICS,...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
Utilization and validation of a computer program designed for aircraft interior noise prediction is considered. The program, entitled PAIN (an acronym for Propeller Aircraft Interior Noise), permits (in theory) predictions of sound levels inside propeller driven aircraft arising from sidewall transmission. The objective of the work reported was to determine the practicality of making predictions for various airplanes and the extent of the program's capabilities. The ultimate purpose was to...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC NOISE, COMPUTER PROGRAMS, NOISE PREDICTION...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
A spin-tunnel investigation of the spin and recovery characteristics of a 1/25-scale model to the General Dynamics F-16XL aircraft was conducted in the Langley Spin Tunnel. Tests included erect and inverted spins at various symmetric and asymmetric loading conditions. The required size of an emergency spin-recovery parachute was determined.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT DESIGN, FLIGHT CONTROL, MODELS, SPIN DYNAMICS, SPIN...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
All ground-based observations of the solar five-minute oscillations are affected by turbulence in the Earth's atmosphere that leads to substantial refractive index variations. The turbulent motions serve to mix an air mass that is thermally stratified in the vertical, thereby producing intermittent thermal fluctuations over a wide range of heights in the atmosphere. These thermal structures yield refractive index changes that deflect the light path in a complicated way, producing intricate...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, ATMOSPHERIC TURBULENCE, DIFFRACTION,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Prompted by an increasing awareness of the influence of human activity on the chemistry of the global troposphere, a panel was formed to (1) assess the requirement for a global study of the chemistry of the troposphere; (2) develop a scientific strategy for a comprehensive plan taking into account the existing and projected programs of the government; (3) assess the requirements of a global study in terms of theoretical knowledge, numerical modeling, instrumentation, observing platforms,...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CHEMISTRY, PROJECT PLANNING, RESEARCH MANAGEMENT,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
To provide a suitable electromagnetic torque summing approach to flight control system redundancy, a four channel motor capable of sustaining full performance after any two credible failures was designed, fabricated, and tested. The design consists of a single samarium cobalt permanent magnet rotor with four separate three phase windings arrayed in individual stator quadrants around the periphery. Trade studies established the sensitivities of weight and performance to such parameters as design...
Topics: NASA Technical Reports Server (NTRS), ACTUATORS, ELECTRIC MOTORS, ELECTROMECHANICAL DEVICES, FLIGHT...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Key design issues of the regenerative fuel cell system concept were studied and a design definition of an alkaline electrolyte based engineering model system or low Earth orbit missions was completed. Definition of key design issues for a regenerative fuel cell system include gaseous reactant storage, shared heat exchangers and high pressure pumps. A power flow diagram for the 75 kW initial space station and the impact of different regenerative fuel cell modular sizes on the total 5 year to...
Topics: NASA Technical Reports Server (NTRS), ELECTROLYSIS, ELECTROLYTIC CELLS, ENERGY STORAGE,...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Helium and hydrogen backscattering; ultraviolet and EUV absorption spectra; optical extinction and polarization; hot gases; soft X-ray observations; infrared and millimeter wavelengths; radio wavelengths and theoretical models of the interstellar matter within about 150 parsecs of the Sun were examined.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL MODELS, CONFERENCES, COSMOLOGY, HIGH TEMPERATURE...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Global modeling; satellite data assimilation and initialization; simulation of future observing systems; model and observed energetics; dynamics of planetary waves; First Global Atmospheric Research Program Global Experiment (FGGE) diagnosis studies; and National Research Council Research Associateship Program are discussed.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CIRCULATION, GLOBAL ATMOSPHERIC RESEARCH PROGRAM,...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
Various topics relating to lunar evolution are discussed. The Moon's ancient orbital history, geophysical and geochemical constraints favoring the capture hypothesis, the site of the lunar core, chemical and petrological constraints, dynamical constraints, and mathematical models are among the topics discussed.
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, LUNAR EVOLUTION, MOON, ANGULAR MOMENTUM, APOLLO...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
The propulsion simulator calibration laboratory (PSCL) in which calibrations can be performed to determine the gross thrust and airflow of propulsion simulators installed in wind tunnel models is described. The preliminary checkout, evaluation and calibration of the PSCL's 3 component force measurement system is reported. Methods and equipment were developed for the alignment and calibration of the force measurement system. The initial alignment of the system demonstrated the need for more...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC CONFIGURATIONS, EXHAUST NOZZLES, FLOW...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
An attempt is made to analytically model the physicochemical properties of lubricants and their capacity to reduce friction. A technique of frozen fracturing of the lubricants was employed to study the dispersion of additives throughout a lubricant. Adsorption was observed at the liquid-solid interface, which was the region where the solid and lubricant met, and the molecular dispersion of the additive enhanced the effectiveness of the lubricant. The electrically conductive characteristics of...
Topics: NASA Technical Reports Server (NTRS), FRICTION REDUCTION, LUBRICANTS, LUBRICATION, TRIBOLOGY,...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
A technique is demonstrated for accelerated stress corrosion testing of high strength aluminum alloys. The method offers better precision and shorter exposure times than traditional pass fail procedures. The approach uses data from tension tests performed on replicate groups of smooth specimens after various lengths of exposure to static stress. The breaking strength measures degradation in the test specimen load carrying ability due to the environmental attack. Analysis of breaking load data...
Topics: NASA Technical Reports Server (NTRS), ALUMINUM ALLOYS, FRACTURE MECHANICS, MATHEMATICAL MODELS,...
0
0.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 0
favorite 0
comment 0
A major phase of the Space Shuttle Vehicle (SSV) Development Program was the acquisition of data through the space shuttle wind tunnel testing program. It became obvious that the large number of configuration/environment combinations would necessitate an extremely large wind tunnel testing program. To make the most efficient use of available test facilities and to assist the prime contractor for orbiter design and space shuttle vehicle integration, a unique management plan was devised for the...
Topics: NASA Technical Reports Server (NTRS), AEROTHERMODYNAMICS, SPACECRAFT CONFIGURATIONS, SPACECRAFT...
2
2.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 2
favorite 0
comment 0
Structure and evolution of large scale photospheric and coronal magnetic fields in the interval 1976-1983 were studied using observations from the Stanford Solar Observatory and a potential field model. The solar wind in the heliosphere is organized into large regions in which the magnetic field has a componenet either toward or away from the sun. The model predicts the location of the current sheet separating these regions. Near solar minimum, in 1976, the current sheet lay within a few...
Topics: NASA Technical Reports Server (NTRS), MATHEMATICAL MODELS, PHOTOSPHERE, PREDICTION ANALYSIS...
1
1.0
Aug 23, 2016
08/16
Aug 23, 2016
by
NASA Technical Reports Server (NTRS)
texts
eye 1
favorite 0
comment 0
The roles of the cryosphere, and of cloud-radiative interactions are investigated. The effects clouds and ice have in the climate system are examined. The cloud radiation research attempts explain the modes of interaction (feedback) between raditive transfer, cloud formation, and atmospheric dynamics. The role of sea ice in weather and climate is also discussed. Models are used to describe the ice and atmospheric dynamics under study.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, CLIMATOLOGY, CLOUD PHYSICS, METEOROLOGY,...