On the atmosphere as an optical communication channel.
Mathematical model for atmosphere as optical communication channel, noting error probability dependence on amount of turbulence and diversity
Hoversten, E. V.↗
SEARCH · Engineering Papers
Results for “Diversion”
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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Further results concerning the effect of frequency-selective fading on differentially coherent matched filter receivers.
Error probabilities for binary DPSK communication through frequency selective channels with predetection diversity matched filter reception
Bailey, C. C.↗
Calibration standard for dynamic evaluation of a profile-plotter
Template is used for evaluation of the dynamic characteristics and accuracy of the plotter. It has a profile composed of surfaces parallel to and at known distances from a reference plane, plane, the diverse surfaces being connected by slopes of known angles and blended by cylindrical developments of known radii.
Moulton, K. S.↗
Display requirements for advanced manned spacecraft.
Displays and controls requirements in manned spacecraft to integrate man into vehicle system, noting man capability for task diversity
Duncan, R. C.↗
Some antecedents and consequences of scientific performance.
Engineer performance related to organizational factors, discussing colleague contact, work diversity, number of subordinates and involvement in work
Farris, G. F.↗
Effects of lengthwise lift distribution on sonic boom of SST configurations.
Sonic boom signatures produced by diverse SST configurations during cruise, indicating aircraft length as overpressure limit factor
Ferri, A.↗
Testing of spacecraft systems in a simulated ionospheric plasma
Laboratory simulation of interactions between ionospheric plasma and diverse spacecraft systems
Burrowbridge, D. R., Jr.↗
Sources of electromagnetic radiation
Electromagnetic radiation sources for remote sensing application to identification of water, moist soil and vegetation, discussing optical properties of diverse materials
Legault, R. R.↗
Testing of spacecraft systems in a simulated ionospheric plasma
Laboratory simulation of interactions between ionospheric plasma and diverse spacecraft systems
Burrowbridge, D. R., Jr.↗
Aircraft Propulsion
The Lewis Research Center is the National Aeronautics and Space Administration's principal field installation for research and development of advanced-aerospace-propulsion and power-generating systems. More specifically, a substantial part of the Center's activities is devoted to progress in the technology of aircraft propulsion. Work includes such diverse areas as components, controls and other aspects of installation, V/STOL and low-cost-engine designs and noise reduction. The results of this work are published as NASA reports and as articles in the technical journals. In addition, an occasional technical conference assists us in communicating more directly with others in the engineering fraternity. Accordingly, this conference - in which the NASA Ames, Flight, and Langley Research Centers are represented where they are working in related areas - is held to present the results of our recent and current work.
Source record↗
Improved RF calibration techniques: System operating noise temperature calibrations
System operating noise temperature calibrations of S band research operational cone at Venus Deep Space Station and polarization diversity S band cone at Mars Deep Space Station
Reid, M. S.↗
NASTRAN Installation: Implementation Steps and Possible Problems Encountered
NASTRAN, from its inception, was designed to operate on several diverse computer system. It is currently installed and operating on the CDC 6600, the IBM 360, and the UNIVAC 1108. This paper discusses the steps found by CSC to be necessary in installing NASTRAN on a computer system and the possible obstacles that might be encountered in undertaking NASTRAN installation. Reference is made to actual problems that arose during installation on the above machines. With a knowledge of what has happened to date in setting up NASTRAN, the future user will be better able to cope with and understand the implications of installing NASTRAN on his computer.
Dielmann, H. E.↗
Handbook of human engineering design data for reduced gravity conditions
A Handbook is presented for the use of engineers, designers, and human factors specialists during the developmental and detailed design phases of manned spacecraft programs. Detailed and diverse quantified data on man's capabilities and tolerances for survival and productive effort in the extraterrestrial environment are provided. Quantified data and information on the space environment as well as the characteristics of the vehicular or residential environment required to support man in outer space are also given.
Marton, T.↗
Requirement for a standard language for test and ground operations
The basic requirements for a standard test and checkout language applicable to all phases of the space shuttle test and ground operations are determined. The general characteristics outlined here represent the integration of selected ideas and concepts from operational elements within Kennedy Space Center (KSC) that represent diverse disciplines associated with space vehicle testing and launching operations. Special reference is made to two studies conducted in this area for KSC as authorized by the Advanced Development Element of the Office of Manned Space Flight (MSF). Information contained in reports from these studies have contributed significantly to the final selection of language features depicted in this technical report.
Medlock, J. R.↗
Shock-metamorphic effects in the Luna-16 soil sample from Mare Fecunditatis
The results of intensive studies indicate that shock-metamorphic effects, characteristic of meteorite impact and virtually identical to those observed in Apollo samples, are common in fragments of the Luna-16 soil sample from Mare Fecunditatis. Two types of shock effects are present: (1) deformation and partial melting features in rock and mineral fragments (1-2 percent of fragments); and (2) heterogeneous glasses and glassy breccias produced by shock melting (70-80 percent of fragments). Shock effects were observed in pyroxene (deformation twin lamellae, multiple planar shock lamellae, extreme mosaicism, partial isotropization); in plagioclase (planar shock lamellae, complete isotropization to form maskelynite); and in basalt fragments (plagioclase isotropization, selective partial melting). The glasses exhibit several characteristics of shock melting, especially: (1) diversity in chemical composition; (2) association with shock mineral fragments and Ni-Fe spherules; and (3) heterogeneous schlieren and incipient fusion of mineral inclusions. Two types of source rocks are present in the Luna-16 sample; basaltic (85-90 percent) and feldspathic (10-15 percent). The basaltic rocks are predominant and generally occur as unshocked fragments, indicating that they form the bedrock underlying Mare Fecunditatis.
French, B. M.↗
An electrochemical model for hot-salt stress-corrosion of titanium alloys
An electrochemical model of hot-salt stress-corrosion cracking of titanium alloys is proposed based on an oxygen-concentration cell. Hydrogen embrittlement is proposed as the direct cause of cracking, the hydrogen being generated as the results of the hydrolysis of complex halides formed at the shielded anode of the electrochemical cell. The model found to be consistent with the diverse observations made both in this study and by many investigators in this field.
Garfinkle, M.↗
Preliminary examination of lunar samples
The morphology, mineralogy, petrology, and chemistry of the samples returned from the Apollo 15 landing site are discussed. A selenological description of the area from which the samples were taken is given. The diversity of the samples and the variety of sample environments found at the Apollo 15 site have resulted in several hypotheses that relate individual samples to local situations after even a preliminary examination of the samples. Several somewhat speculative hypotheses that relate individual samples to a geological framework are discussed in the hope that the hypotheses will provide guidelines for more detailed studies of the samples to arrive at an integrated understanding of the selenology of the Apollo 15 site.
Source record↗
Scientific and engineering analyses of Jupiter's energetic electrons and protons
Details of magnetic field conclusions, UHF radio data sets, and the theoretical synchrotron radiation descriptions are summarized for several published and unpublished analyses. The relatively compact set of electron models inspires some confidence in their validity, particularly as they have been derived from numerous data and analysis techniques. Although the models have serious consequences for spacecraft design, the problems they imply are probably soluble with technologies anticipated for spacecraft to be designed for Jupiter encounter. By contrast, the proton models are very diverse, fluxes and energies spanning several orders of magnitude even for those models based on physical considerations; this results from the absence of applicable data. However, even in the midrange of these models, the proton energies and fluxes would be severely hazardous to several spacecraft subsystems. It is therefore desirable to apply further technical consideration to the modeling of Jupiter's energetic proton population.
Divine, N.↗