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  • Other Sources  (136)
  • SOLAR PHYSICS  (65)
  • COMMUNICATIONS AND RADAR  (37)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (34)
  • 1980-1984  (136)
  • 1981  (136)
  • 1
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    Passive components for high temperature operation (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The development of resistors, capacitors, and interconnect metalizations utilizing a low pressure chemical vapor deposition (LPCVD) process is described. The LPCVD process allows the passive components to be fabricated at temperatures higher than their highest operating temperatures. The deposition of thin films by LPCVD is accomplished by reacting one or more gases on the surface of a heated substrate. The substrates to be coated are placed on a graphite susceptor and then loaded into the center of a quartz reaction tube. The RF power is applied to the coil on the outside of the reaction tube which in turn is coupled into the graphite susceptor causing it to heat. Pressures of several torr or less are typical, with carrier flow rates of 0.1 to 2.0 liters/min. Nitrogen, hydrogen, and helium are typical carrier gases. These are controlled with mass flow controllers and the pressure is continuously monitored with a capacitive manometer. Materials selection and device testing are also discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Lewis Research Center Proc. of the Conf. on High-Temp. Electron.; p 21-23
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    System data communication structures for active-control transport aircraft, volume 1 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Candidate data communication techniques are identified, including dedicated links, local buses, broadcast buses, multiplex buses, and mesh networks. The design methodology for mesh networks is then discussed, including network topology and node architecture. Several concepts of power distribution are reviewed, including current limiting and mesh networks for power. The technology issues of packaging, transmission media, and lightning are addressed, and, finally, the analysis tools developed to aid in the communication design process are described. There are special tools to analyze the reliability and connectivity of networks and more general reliability analysis tools for all types of systems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-165773 , NAS 1.26:165773 , R-1469-VOL-1
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    NASA TECHNICAL REPORTS
  • 3
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    System data communication structures for active-control transport aircraft, volume 2 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The application of communication structures to advanced transport aircraft are addressed. First, a set of avionic functional requirements is established, and a baseline set of avionics equipment is defined that will meet the requirements. Three alternative configurations for this equipment are then identified that represent the evolution toward more dispersed systems. Candidate communication structures are proposed for each system configuration, and these are compared using trade off analyses; these analyses emphasize reliability but also address complexity. Multiplex buses are recognized as the likely near term choice with mesh networks being desirable for advanced, highly dispersed systems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-165774 , NAS 1.26:165774 , R-1469-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Multiwavelength monolithic integrated fiber optics terminal - An update (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper serves as an update for the Multiwavelength Monolithic Integrated Fiber Optic Terminal (MMIFOT) being developed by MDAC-St. Louis for NASA's Johnson Space Center. The program objective is to utilize guided wave optical technology to develop a passive optical wavelength multiplexing subsystem with a single mode optical fiber serving as the transmission medium.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Seminar on Guided-wave optical and surface acoustic wave devices, systems and applications; Jul 29, 1980 - Jul 31, 1980; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A prediction model for bipolar RAMs in a high energy ion/proton environment (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A model has been developed which predicts the relative susceptibility of bipolar RAMs to heavy ion and proton upset. During the course of evaluating this model, physical and electrical variations were also evaluated indicating that the minimum internal signal level is the primary upset susceptibility indicator. Unfortunately, all of the physical and electrical variations expected during a normal product development cycle are in direct opposition to improved high-energy particle upset tolerance. Hence, a trade-off between highly susceptible, low power (medium speed) devices must be made against the less susceptible, higher power (high speed) equivalent device, taking into account the systems trade-off with respect to system power, software, error correction procedures and/or circuit redundancy.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: text
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  • 6
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    Development of integrated thermionic circuits for high-temperature applications (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Integrated thermionic circuits (ITC) capable of extended operation in ambient temperatures up to 500 C are studied. A set of practical design and performance equations is demonstrated. Experimental results are discussed in which both devices and simple circuits were successfully operated in 5000 C environments for extended periods. It is suggested that ITC's may become an important technology for high temperature instrumentation and control systems in geothermal and other high temperature environments.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Lewis Research Center Proc. of the Conf. on High-Temp. Electron.; p 49-53
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  • 7
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    Far-infrared bandpass filters from cross-shaped grids (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The optical transmission characteristics of electroformed metal grids with inductive and capacitive cross patterns have been investigated in the far-infrared spectral region. The transmission characteristics of one- and two-grid devices are represented by transmission line theory parameters. Results are used to suggest construction guidelines for two-grid bandpass filters.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Applied Optics; 20; Apr. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Thermal iron ions in high speed solar wind streams. II - Temperatures and bulk velocities (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Mitchel and Roelof (1980) reported the detection of iron in high speed solar wind flows using the small, but finite sensitivity of solid state detectors to Fe ions in the low energy (50-200 keV protons) L1 channel of the NOAA/JHU energetic particle experiment (EPE). In the current investigation, the EPE response is modeled to a convected Maxwellian to obtain the thermal velocity, flow angle, and bulk velocity of the iron distribution. It is assumed that the iron bulk flow velocity can be represented as a vector sum of the hydrogen bulk velocity and an interplanetary magnetic field (IMF) aligned velocity increment. It is found that the velocity increment is smaller than the local Alfven speed in magnitude, and that the iron thermal velocity is comparable with or greater than the proton thermal velocity, with the 'thermal' velocity defined as the square root of 2kT/m.
    Keywords: SOLAR PHYSICS
    Type: AD-A105214 , AFGL-TR-81-0279 , Geophysical Research Letters; 8; July 198
    Format: text
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  • 9
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    Amplitude and angle of arrival measurements on a 28.56 GHz Earth-space path (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The amplitude and angle of arrival measurements on an Earth-space path using the 28.56 GHz COMSTAR D3 satellite beacon are described. These measurements were made by the Ohio State University ElectroScience Laboratory during the period September 1978 to September 1979. Monthly, quarterly, and annual distributions of attenuation, angle of arrival, and variance of both these parameters are reported. During this period, fades exceeding 29 dB for .00% of the time and angle of arrival fluctuations exceeding .12 degrees for .01% of the time were observed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-164533 , ESL-TR-712759-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Effects of atmospheric turbulence on microwave and millimeter wave satellite communications systems (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A model of the microwave and millimeter wave link in the presence of atmospheric turbulence is presented with emphasis on satellite communications systems. The analysis is based on standard methods of statistical theory. The results are directly usable by the design engineer.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-168766 , NAS 1.26:168766 , ESL-712759-6
    Format: application/pdf
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