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  • Other Sources  (99)
  • SOLAR PHYSICS  (65)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (34)
  • 1980-1984  (99)
  • 1981  (99)
  • 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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  • 2
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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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  • 3
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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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  • 4
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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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  • 5
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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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  • 6
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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
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  • 7
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    Large loop thermal models of solar hard X-ray bursts (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results for small loop thermal models of hard X-ray bursts are extended to large loops. In this model a magnetic arch with a coronal length of 45,000 km has the electrons near the top heated to temperatures above 1 billion K. The resulting conduction fronts which form are dominated by collisionless processes and travel down the arch to the transition region and chromosphere where they evaporate off part of the latter. This relatively cool material travels back up the loop and eventually quenches the source for energy injection times of order 10 sec. Most of the X-ray emission comes from the footpoints of the arch over most of the source lifetime and the spectrum is a power law with a typical spectral index of 3.0. Even though the efficiency gain in this model is only 2.8, it is much easier from the point of view of plasma physics to heat all the electrons in a plasma than to accelerate a substantial fraction of them.
    Keywords: SOLAR PHYSICS
    Type: ESA Plasma Astrophys.; p 401-404
    Format: text
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  • 8
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    Eclipse radius measurements (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Methods for predicting the path edges and reducing observations of total solar eclipses for determining variations of the solar radius are described. Analyzed observations of the 1925 January eclipse show a 0.7 (arc second) decrease in the solar radius during the past fifty years.
    Keywords: SOLAR PHYSICS
    Type: Variations of the Solar Constant; p 117-120
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  • 9
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    The sunspot chromosphere-corona transition region (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Data from simultaneous readings of the line intensities, Doppler shifts, and line widths of a sunspot ion emission lines between 1170-1700 A are reported. Subsonic and supersonic flows were observed in the same line of sight above the umbra. A reduction of coronal plasma over sunspots with an electron temperature exceeding 1,000,000 K was confirmed, concurrent with enhanced emission from the transition region plasma in the temperature range 200,000-1,000,000 K. The differential emission measure is noted to have been caused to shift because of the enhancement of the transition region plasma emission, where radiative losses dominated the energy balance. Calculations of the energy balance also indicated that a detected divergence in the enthalpy flux for the umbral downflows could balance the radiative losses in the electron temperature range 30,000-200,000 K.
    Keywords: SOLAR PHYSICS
    Type: The physics of sunspots; Conference; Jul 14, 1981 - Jul 17, 1981; Sunspot, NM
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  • 10
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    Energetic electrons and plasma waves associated with a solar type III radio burst (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Detailed in situ observations from the ISEE 3 spacecraft of energetic electrons, plasma waves, and radio emission for the type II solar radio burst of February 17, 1979, are presented. The reduced, one-dimensional electron distribution function is constructed as a function of time. Since the faster electrons arrive before the slower ones, a bump on tail distribution forms which is unstable to the growth of Langmuir waves. The plasma wave growth computed from the distribution function agrees well with the observed onset of the Langmuir waves, and there is qualitative agreement between variations in the plasma wave levels and in the development of regions of positive slope in the function. The evolution of the function, however, predicts far higher plasma wave levels than those observed. The maximum levels observed are approximately equal to the threshold for nonlinear wave processes, such as oscillation two-stream instability and soliton collapse.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 251
    Format: text
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