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  • Weitere Quellen  (74)
  • SOLAR PHYSICS  (40)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (34)
  • Cell & Developmental Biology
  • 1980-1984  (74)
  • 1982  (74)
  • 1
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    Far-infrared imaging antenna arrays (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: A far-infrared monolithic imaging antenna array with diffraction-limited resolution has been demonstrated. The optical system is similar to an oil-immersion microscope, except that the position of the object and the image are interchanged. The array is a series of evaporated silver bow-tie antennas of 75 nm thick, spaced at 310 microns, on a fused-quartz substrate; the bow angle of 60 deg gives an impedance of 150 ohm to match to bismuth microbolometers. The measured responsivity of the array elements is 1-2 V/W at the relatively low bias of 1 mA. Previous measurements have shown that the bolometers are 1/f noise limited up to 100 kHz and that they have a frequency response of 5 MHz. The antenna array should be adequate for far-infrared plasma interferometer measurements.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Applied Physics Letters; 40; Feb. 1
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  • 2
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    Interaction of a collisionless conduction front with the chromosphere and solar hard X-ray bursts (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 252
    Format: text
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  • 3
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    Self-heated thermocouples for far-infrared detection (1982)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: A novel self-heated Bi-Sb thermocouple for far-infrared detection has been developed. The detector is suitable for integration with monolithic antennas and imaging arrays. The device is fabricated in a single photolithography masking step using a photoresist-bridge technique. This bridge technique has also been used to make microbolometers with lower 1/f noise than those made by two conventional masking steps. The thermocouples have a noise equivalent power of 7 x 10 to the -10th W/sq rt of Hz and a 3-dB frequency response of 150 kHz.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
    Materialart: Applied Physics Letters; 41; Sept. 1
    Format: text
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  • 4
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    Radial variation of the solar wind speed between 1 and 15 AU (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Pioneer 10 and 11 solar wind speeds measured between 1.4 and 15.2 AU are compared with those of IMP 6, 7, and 8 measured at 1 AU for 90-day intervals centered on six solar radial alignments between 1973 and 1978. The time profile of the solar wind speed undergoes change as the distance from the sun increases, which is due to interaction of adjacent solar wind streams. Speed variations are smaller at greater radial distance and both the highest and lowest speeds disappear as radial distance increases. For periods with extremely high speed solar wind streams, the mean solar wind speed decreases as the distance from the sun increases, which must be due to the disappearance of the highest speeds of the streams with increasing distance. It is concluded that at distances from the sun greater than 30-40 AU, the solar wind behavior may closely resemble that of a radially expanding constant speed plasma.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Apr. 1
    Format: text
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  • 5
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    Measurement of the profile of solar He I resonance lines (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The analysis of data obtained by a rocket-borne helium-filled spectrometer employing a curve-of-growth technique in 1977 and 1980 is used in an investigation of the 584-A helium resonance line from the full solar disk. Between 6.5 and 13% of the Gaussian core area was found to be missing through self-reversal. Line widths from 1980 and 1977 were 101 + or - 10 mA and 128 + or - 20 mA full width at half maximum, respectively. No consistent relationship is found between the measured widths and solar activity.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Mar. 1
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  • 6
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    Single event upset sensitivity of low power Schottky devices (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Data taken from tests involving heavy ions in the Berkeley 88 in. cyclotron being directed at low power Schottky barrier devices are reported. The tests also included trials in the Harvard cyclotron with 130 MeV protons, and at the U.C. Davis cyclotron using 56 MeV protons. The experiments were performed to study the single event upsets in MSI logic devices containing flip-flops. Results are presented of single-event upsets (SEU) causing functional degradation observed in post-exposure tests of six different devices. The effectiveness of the particles in producing SEUs in logic device functioning was found to be directly proportional to the proton energy. Shielding was determined to offer negligible protection from the particle bombardment. The results are considered significant for the design and fabrication of LS devices for space applications.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 7
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    Annual Conference on Nuclear and Space Radiation Effects, 19th, Las Vegas, NV, July 20-22, 1982, Proceedings (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The results of research concerning the effects of nuclear and space radiation are presented. Topics discussed include the basic mechanisms of nuclear and space radiation effects, radiation effects in devices, and radiation effects in microcircuits, including studies of radiation-induced paramagnetic defects in MOS structures, silicon solar cell damage from electrical overstress, radiation-induced charge dynamics in dielectrics, and the enhanced radiation effects on submicron narrow-channel NMOS. Also examined are topics in SGEMP/IEMP phenomena, hardness assurance and testing, energy deposition, desometry, and radiation transport, and single event phenomena. Among others, studies are presented concerning the limits to hardening electronic boxes to IEMP coupling, transient radiation screening of silicon devices using backside laser irradiation, the damage equivalence of electrons, protons, and gamma rays in MOS devices, and the single event upset sensitivity of low power Schottky devices.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 8
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    A three-component model of the variability of the solar ultraviolet flux 145-200 nM (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: The variability of the ultraviolet flux between 145 and 200 nm over both the eleven-year cycle and the 27-day solar rotation period is examined in terms of chromospheric activity, as determined from ground-based observations of the CaII K chromosphere. A three-component model of the solar UV flux is developed which includes the contributions to the full disk flux from both plage and active network emission. Solar cycle and solar rotation variations derived from the model are compared with the results of satellite and rocket experiments and with the two-component model of Cook et al (1980). Finally, possible ways of improving the model are discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Dec. 1
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  • 9
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    Active-region evolution and solar rotation variations in solar UV irradiance, total solar irradiance, and soft X rays (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Variations in the total solar irradiance, solar UV spectral irradiance, and solar soft X-ray emission caused by active region evolution and solar rotation are analyzed by using concurrent measurements from the NIMBUS 7 and GOES satellites. The observations are interpreted by using simple empirical models that relate ground-based observations of the size and location of sunspots and plages to the full-disk temporal variations. It is found that the major dips in the photospheric total solar irradiance S, which are evident in both satellite measurements and model predictions, are usually not accompanied by outstanding enhancements in the chromospheric and upper photospheric UV spectral irradiance or coronal X rays. The main cause of this difference between the variability of S and of the UV flux is that the total chromospheric plage enhancements are not outstanding at those times when the total sunspot are outstanding. X rays are even more variable because of a much wider CMD sensitivity.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 87; Dec. 1
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  • 10
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    The dependence of single event upset on proton energy /15-590 MeV/ (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Low earth orbit satellite and Jupiter orbiter probe semiconductor devices may incur soft errors or single event upsets, manifested as bit flips, during exposure to such nuclear particles or heavy ions as trapped protons with energies ranging up to 1000 MeV. Experimental data is given on the average proton fluence needed to cause a bit flip as a function of proton energy for isoplanar bipolar TTL RAMs. Error dependence data shape and threshold energy can be related to the existing body of theoretical data on energy deposition following proton nuclear reactions. Experimental data also show that the relative cross sectional amplitude for functionally identical devices can be related to the device's power consumption.
    Schlagwort(e): ELECTRONICS AND ELECTRICAL ENGINEERING
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