Machining, surface work hardening, and strength of MgO
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Rice, R. W.↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Putting all our noise technology to work
An assessment of the present state of the art in noise reduction technology indicates that this technology has the potential for effectively attaining this goal - a conclusion that is in apparent conflict with the frequently voiced complaints on intolerable noise levels near airports. Measures are suggested for a more vigorous implementation of available technology in practice to combat the aircraft noise problem.
Jackson, R. P.↗
Temperature dependence of yielding and work-hardening rates in magnesium oxide single crystals
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Srinivasan, M.↗
Liquid-metal atomization for hot working preforms
Rapid quenching of a liquid metal by atomization or splat cooling overcomes the major limitation of most solidification processes, namely, the segregation of alloying elements, impurities, and constituent phases. The cooling rates of different atomizing processes are related to the dendrite arm spacings and to the microstructure of the atomized powders. The increased solubility limits and the formation of metastable compounds in splat-cooled alloys are discussed. Consolidation of the powders by hot isostatic compaction, hot extrusion, or hot forging and rolling processes yields billets with properties equivalent to or better than those of the wrought alloys. The application of this powder processing technology to high-performance alloys is reviewed.
Grant, N. J.↗
The Final Skylab Mission: Man at Home and at Work in Space
The accomplishments of the Skylab 4 mission are discussed. The medical experiments and dietary aspects of the mission are reported. The observation of the Comet Kohoutek is described. The remote sensing of earth resources is examined to show the areas of coverage. The repair of the space station and the accomplishment of unscheduled requirements are discussed. Statistical data of all the Skylab missions are tabulated.
Source record↗
Working model of the London moment readout system
The operating characteristics of a porous plug which has liquid helium on one side and which is pumped on under vacuum on the other side are discussed. The system investigated consists of a container of liquid helium which is well isolated, and the only means for mass flow out of the container is through a plug mode of porous material. The plug was assumed to have liquid helium on the container side while the other side of the plug is evacuated. Three cases were considered: (1) perfect evacuation with zero pressure, (2) evacuation through a chocked orifice, and (3) evacuation through a long, small diameter pipe with heating. Mass flow rates were determined along with mass flow at temperature above the lambda point temperature. Solutions were obtained for normal and superfluid velocity.
Hendricks, J. B.↗
Training of astronauts in laboratory-aircraft under weightless conditions for work in space
Analyses of occupational activities of astronauts in laboratory-aircraft flights simulating weightlessness conditions permit the development of training methods and optimization of the interaction of man with various spacecraft designs.
Khrunov, Y. V.↗
Satellite laser ranging work at the Goddard Space Flight Center
Laser ranging systems, their range and accuracy capabilities, and planned improvements for future systems are discussed, the systems include one fixed and two mobile lasers ranging systems. They have demonstrated better than 10 cm accuracy both on a carefully surveyed ground range and in regular satellite ranging operations. They are capable of ranging to all currently launched retroreflector equipped satellites with the exception of Timation III. A third mobile system is discussed which will be accurate to better than 5 cm and will be capable of ranging to distant satellites such as Timation III and LAGEOS.
Mcgunigal, T. E.↗
Emotionality in response to aircraft noise: A report of development work
A literature search and pilot study conducted to investigate the topic of emotional response to aircraft noise are described. A Tell-A-Story Technique was developed for use in the pilot study which required respondents to make up stories for a series of aircraft-related and non-aircraft-related pictures. A content analysis of these stories was made. The major finding was that response patterns varied among three groups of respondents - those currently living near airports, those who had lived near airports in the past, and those who had never lived near airports. Negative emotional feelings toward aircraft were greatest among respondents who had lived near airports in the past but no longer did. A possible explanation offered for this finding was that people currently living near airports might adapt to the situation by denying some of their negative feelings, which they might feel more free to express after they had moved away from the situation. Other techniques used in the pilot study are also described, including group interviews and a word association task.
Klaus, P. A.↗
On the nature of the anti-tail of Comet Kohoutek /1973f/. I - A working model
The model derived for the anti-tail of Comet Kohoutek describes it as a flat formation, confined essentially to the comet's orbit plane and composed of relatively heavy particles (mostly in the size range 0.1-1 mm) whose motions are controlled by solar gravity and solar radiation pressure. Almost all the material was produced by the comet before perihelion at a rate about an order of magnitude higher than for Comets Arend-Roland and Bennett. The latent heat of vaporization of the particle material is estimated at 40-45 kcal/mole or higher.
Sekanina, Z.↗
Wideband phase modulator works directly on carrier
Multiplier-induced problems related to undesirable effects of the varactor multiplier on the modulation spectrum are eliminated in a modulator circuit which operates directly at the desired output frequency. The principles of operation of the new circuit are discussed and attention is given to requirements for high-Q components and the possibility of linear frequency deviation.
Rippy, R. R.↗
Immediate cardiac response to exercise - Physiologic investigation by systolic time intervals at graded work loads
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Xenakis, A. P.↗
Summary of the Operational Applications of Satellite Snowcover Observations Working Session, 20 August 1975
Various techniques for reducing the satellite data to a form usable by the operational agencies were covered in mini-presentations by the operational satellite snow interpretive personnel. Similar discussions were made by operational agency stream flow forecasters on how satellite-derived snow data could be incorporated into runoff forecasting methods.
Salomonson, V. V.↗
On the relation of J sub I to work done per unit uncracked area: Total, or component 'due to crack'
The direct evaluation of Rice's JI as a function of displacement, from the load-displacement record of a test of a single precracked specimen, was discussed. Special attention was given to the general form of the underlying relation.
Srawley, J. E.↗
Collected Works of Robert T. Jones
Fluid dynamic principles are applied to airfoil stability and control problems, blood pump studies, and in relativistic kinematics.
Aeronautics↗
Design of a 4 1/2 stage turbine with a stage loading factor of 4.66 and high specific work output
The aerodynamic design of a highly loaded multistage fan drive turbine is discussed. Turbine flowpath and airfoil sections are presented along with respective pressure and velocity distributions. Vibrational modes are identified in the expected turbine operating range.
Webster, P. F.↗
Closed cycle MHD power generation experiments using a helium-cesium working fluid in the NASA Lewis Facility
A MHD channel, which was previously operated for over 500 hours of thermal operation, ten thermal cycles, and 200 cesium injection tests, was removed from the facility and redesigned. The cross sectional dimensions of the channel were reduced to 5 by 16.5 cm to allow operation over a variety of conditions. The redesigned channel has been operated for well over 300 hours, 10 thermal cycles, and 150 cesium injection tests with no problems. Experiments have been run at temperatures of 1900-2100 K and Mach numbers from 0.3 to 0.55 in argon and 0.2 in helium. The best results to date have been obtained in the helium tests. Power outputs of 2.2 kw for tests with 28 electrodes and 2.1 kw for tests with 17 electrodes were realized. Power densities of 0.6 MW/cu m and Hall fields of about 1,100 V/m were obtained in the tests with 17 electrodes.
Sovie, R. J.↗
Third Working Meeting on Gallium Arsenide Solar Cells
Research results are reported for GaAs Schottky barrier solar cells, GaAlAs/GaAs heteroface solar cells, and GaAlAs graded band gap solar cells. Related materials studies are presented. A systems study for GaAs and Si solar concentrator systems is given.
Walker, G. H.↗