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  • Other Sources  (30)
  • SOLAR PHYSICS  (13)
  • STRUCTURAL MECHANICS  (9)
  • ENVIRONMENT POLLUTION  (8)
  • 2005-2009
  • 1975-1979  (30)
  • 1
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    Fatigue failure load indicator (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An indicator for recording the load at which a fatigue specimen breaks during the last cycle of a fatigue test is described. A load cell is attached to the specimen which is alternately subjected to tension and compression loads. The output of the load cell which is proportional to the load on the specimen is applied to the input of a peak detector. Each time the specimen is subjected to a compression load, means are provided for applying a positive voltage to the rest of the peak detector to reset it. During the last cycle of the tension load the peak detector measures the maximum load on the specimen. Means are provided for disconnecting the load cell from the peak detector when there is a failure in the specimen.
    Keywords: STRUCTURAL MECHANICS
    Format: application/pdf
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  • 2
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    Determination of the structure and heating mechanisms of coronal loops from soft X-ray observations with the solar probe (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: High resolution soft X-ray imaging from the solar probe is justified in terms of the expected scientific returns which include the determination of the temperature and density structure of a coronal loop. The advantages of the grazing incidence telescope over the multiple pinhole camera are discussed. An instrument package is described which includes a grazing incidence mirror, a thermal prefilter, a three position filter wheel and a focal plane detector baselined as an 800 by 800 back-illuminated charge coupled device. The structural assembly together with the data processing equipment would draw heavily on the designs being developed for the Solar Polar Mission.
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 94-110
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  • 3
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    Integrated steam systems for electric power generation from waste heat (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA. Washington Proc. of Conf. on Waste Heat Management and Util., Vol. 3; 15 p
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  • 4
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    Social aspects of regulating waste heat (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA, Washington Proc. of the Conf. on Waste Heat Management and Util., Volume 1; 17 p
    Format: text
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  • 5
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    A study of the chemical degradation of ClONO2 in the stratosphere (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The flash photolysis-resonance fluorescence system described by Davis et al. (1974) is used to measure the rate constants for the reactions of chlorine nitrate (ClONO2) with stratospheric O(3-P) and OH. Both reactions are examined in a pyrex cell with an internal volume of about 150 cu cm, where the reaction mixture was maintained at 245 K by circulating methanol from a thermostated circulation bath through the outer jacket of the reaction cell. The relative chemical degradation rates as a function of altitude for both reactions are tabulated, which shows that the chemical degradation pathways contribute less than 10% to the total rate of ClONO2 destruction at altitudes less than 30 km. Since the concentration of ClONO2 is calculated to be near its maximum around 25 km and drops off very significantly at higher altitudes, it is concluded that the photochemical decomposition of ClONO2 in the stratosphere is by far the most important degradation path for this molecule.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters; 4; Jan. 197
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  • 6
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    Boundary layer measurements of the OH radical in the vicinity of an isolated power plant plume - SO2 and NO2 chemical conversion times (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Direct measurements of the OH radical in the vicinity of an isolated power plant plume are reported. These measurements were used to estimate the conversion time of SO2 to H2SO4-sulfate aerosol via the initiating step OH + SO2 + M yields HSO3. Using the near-high-noon measured value of OH (9.5 million per cu cm), resulted in a 1/e conversion time of 1.4 days. The latter lifetime would correspond to a conversion rate of about 2%/hr. When the lifetime calculation was modified to take into consideration the OH diurnal cycle, the 1/e conversion time for SO2 was found to be 4.4 days, giving an apparent overall rate of conversion of about 0.7%/hr. Similar calculations carried out for the conversion of NO2 to NHO3 resulted in 1/e lifetimes for NO2 of 2-3 h for midday time periods.
    Keywords: ENVIRONMENT POLLUTION
    Type: Atmospheric Environment; 13; 8, 19; 1979
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  • 7
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    Dielectronic recombination rates, ionization equilibrium, and radiative energy-loss rates for neon, magnesium, and sulfur ions in low-density plasmas (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Results of detailed and systematic calculations are presented for the total dielectronic recombination rate coefficients for the ions of Ne, Mg, and S in a low-density predominantly hydrogen plasma. The new recombination rates are used to calculate solar corona ionization-equilibrium distributions of the ions. The most important effect of dielectronic recombination for ions in corona equilibrium is found to be a shift in the maximum-abundance temperatures toward higher temperatures, which are in some cases reduced from those predicted on the basis of the simple Burgess formula.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 230
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  • 8
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    Effect of end-ring stiffness on buckling of pressure-loaded stiffened conical shells (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Buckling studies were conducted on truncated 120 deg conical shells having large end rings and many interior reinforcing rings that are typical of aeroshells used as spacecraft decelerators. Changes in base-end-ring stiffness were accomplished by simply machining away a portion of the base ring between successive buckling tests. Initial imperfection measurements from the test cones were included in the analytical model.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-1079 , L-11915
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  • 9
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    Buckling tests of three 4.6 meter diameter aluminum honeycomb sandwich conical shells loaded under external pressure (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Three aluminum honeycomb sandwich conical shells with a 120 apex angle and a 4.6-m (15.0-ft) base diameter were loaded to failure by a uniform external pressure. The cones differed from one another only in the thickness of their respective face sheets. Test specimen details, test procedure, and test results are discussed. Both buckling and prebuckling data are compared with appropriate theoretical predictions, and good agreement was obtained between test and theory. Extensive imperfection measurements were made and reported on the three cones in the as fabricated condition.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-7935 , L-9936
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  • 10
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    Comparison of flare bremsstrahlung resulting from energetic thermal and nonthermal electrons (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper investigates the behavior of the X-ray bremsstrahlung spectra resulting from two distinct types of electron distribution functions impinging on a target atmosphere during flare activity. A power-law distribution function is compared with two double-peaked Maxwellians. The results of these calculations show that it would be difficult to rule out multithermal interpretations for the emitted high-energy X-rays.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 51; Jan
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