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  • 1
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    Crustal structure from surface load tilts, using a finite element model (1978)
    In:  Geophys. J. R. astr. Soc., Leiden, Noordhoff, vol. 29, no. 7, pp. 203-226, pp. 2371
    Details
    Publication Date: 1978
    Keywords: Earth model, also for more shallow analyses ! ; Earth tides ; Finite Element Method ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Probability of failure prediction for step-stress fatigue under sine or random stress (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: A previously proposed cumulative fatigue damage law is extended to predict the probability of failure or fatigue life for structural materials with S-N fatigue curves represented as a scatterband of failure points. The proposed law applies to structures subjected to sinusoidal or random stresses and includes the effect of initial crack (i.e., flaw) sizes. The corrected cycle ratio damage function is shown to have physical significance.
    Keywords: STRUCTURAL MECHANICS
    Type: Shock and Vibration Inform. Center The Shock and Vibration Bull., Pt. 1; p 31-41
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Review of Canadian experience in precise gravimetry (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results of gravity observations made in Canada from 1974 to 1978 reviewed, in order to estimate the true accuracy of present-day gravimetry and thereby assess the potential capability of the method for detecting crustal movements. The standard error of the mean of ties is 15-20 nm/s squared. Inter-instrument comparisons and other tests show, however, that a more realistic estimate of D meter accuracy is 30-40 nm/s squared. This accuracy can only be maintained over the long term where uncertainties in gravimeter calibration curves are minimized by resetting to the same dial reading on the resurveys. A further deterioration in accuracy to 40-50 nm/s squared occurs where reliance is placed on presently available D meter calibration curves. Despite the present accuracy limitations significant time variations in gravity of 100-150 nm/s squared are seen over spatial scales of 10-100 kilometers in Canada over a period of several months.
    Keywords: GEOPHYSICS
    Type: Ohio State Univ. Appl. of Geodesy to Geodyn., an Intern. Symp.; p 157-158
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Isotopes of titanium in cool stars (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A program of stellar Ti isotopic-abundance determinations is described and related to changes that may have occurred in the Ti isotopic abundance ratios during the chemical evolution of the Galaxy, and to whether the abundance ratios are perturbed in the S and MS stars having atmospheres with enhanced abundances of s-process nuclei resulting from convective mixing after internal exposure to neutrons. High-resolution (0.07 A) Reticon spectra of portions of the TiO gamma (0,0), gamma (0,1), and delta (0,0) bands were the source material, and particular emphasis was placed on the definition of the continuum level. The isotopic abundance ratios are terrestrial in all of the sample, and errors in the (Ti-i)/(Ti-48) ratio are typically plus or minus 25% for the dwarfs and plus or minus 50% for the giants. The observations show that the magic nucleus Ti-50 is not enhanced in S and MS stars.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 234
    Format: text
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  • 5
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    Observations of emission lines in M supergiants (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Copernicus observations of Mg 2 h and k emission lines from M giants and supergiants are described. Supergiants with extensive circumstellar gas shells show an asymmetric k line. The asymmetry is ascribed to superimposed lines of Fe 1 and Mn 1. The Mg 2 line width fit the Wilson-Bappu relation derived from observations of G and K Stars. Results of correlated ground-based observations include (1) the discovery of K 1 fluorescent emission from the Betelgeuse shell; (2) extimates of the mass-loss rates; and (3) the proposal that silicate dust grains must account for the major fraction of the Si atoms in the Betelgeuse shell.
    Keywords: ASTRONOMY
    Type: NASA-CR-163359
    Format: application/pdf
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  • 6
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    Copernicus observations of Betelgeuse and Antares (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Mg II h and k lines were observed strongly in emission by Copernicus scans of the M supergiants alpha Ori and alpha Sco. The striking symmetry in the k line as contrasted with the symmetric h line, as observed previously was confirmed. Estimates of absolute chromospheric fluxes were obtained. Measured values for the widths of the h and k lines do not follow a Wilson-Bappu relationship. Upper limits determined for other chromospheric lines of alpha Ori tend to exclude the existence of extensive and/or hot regions surrounding this supergiant. Observed weakening by fluorescence of the Fe L 4307 A line is good evidence that the Mn I and Fe I resonance transitions overlying the Mg II k-line profile are responsible for the strong asymmetry of this line in the two stars. However, quantitative study shows that the absorption provided by the cool circumstellar shells is insufficient to provide the observed asymmetry. Additional absorption may be provided by a cool turbulent region at the top of the chromosphere.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 204; Mar. 15
    Format: text
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  • 7
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    Observations of the circumstellar gas shells around Betelgeuse and Antares (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented on the direct observations of the circumstellar shell around alpha-Ori, along with new observations of the Ca II infrared triplet lines which provide lower limits for the Ca(+) shell radii for alpha-Ori and alpha-Sco (Antares). The 8542-A line in alpha-Ori does not show a circumstellar absorption core, and the shell radius limit is estimated to be at least 31 times stellar radius. A 108-mA circumstellar core is observed in the 8542-A line in Antares for which a shell radius equal to 4.0 times stellar radius is suggested. The discovery of circumstellar emission through resonance line scattering will provide valuable additional information on the physical conditions in the shell.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 201; Nov. 1
    Format: text
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  • 8
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    A high-resolution infrared spectrum of IRC +10216 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The IR-emitting core and shell of IRC +10216 are investigated using a high-resolution spectrum covering the wavelength interval between 3 and 5 microns. Line identifications made or confirmed include those due to (C-12)(O-16), (C-13)(O-16), (C-12)(O-17), and (C-12)(O-18). A mean heliocentric velocity of about -32 km/s is obtained from the 42 least blended (C-12)O and (C-13)O lines, and the following isotopic abundance ratios are derived by comparing equivalent widths of the observed lines: C-12/C-13, C-12/C-14, O-16/O-17, and O-17/O-18. The structure of the expanding gas shell is examined, an explanation is offered for the lack of P Cygni profiles in the spectrum, and an unsuccessful search for other molecules is briefly discussed. It is concluded that a low C-12/C-13 ratio is not necessarily a signature of a carbon star.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 213
    Format: text
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  • 9
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    Demonstration of a sterilizable solid rocket motor system (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A solid propellant rocket motor containing 60.9 Kg (134-lb) of propellant was successfully static fired after being subjected to eight heat sterilization cycles (three 54-hour cycles plus five 40-hour cycles) at 125 C (257 F). The test motor, a modified SVM-3 chamber, incorporated a flexible grain retention system of EPR rubber to relieve thermal shrinkage stresses. The propellant used in the motor was ANB-3438, and 84 wt% solids system (18 wt% aluminum) containing 66 wt% stabilized ammonium perchlorate oxidizer and a saturated hydroxylterminated polybutadiene binder. Bonding of the propellant to the EPR insulation (GenGard V-4030) was provided by the use of SD-886, an epoxy urethane restriction.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-2478
    Format: application/pdf
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  • 10
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    Copernicus observations of Betelgeuse and Antares (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Copernicus observations of the M-supergiants, alpha Ori and alpha Sco, are presented. The MgII h and k resonance lines are strongly in emission in both stars. The k line is highly asymmetric in both stars but the h line is symmetric. Upper limits for several other resonance lines are given for alpha Ori. The possibility is explored that the k line asymmetry is caused by overlying resonance lines of MnI and FeI formed in the cool circumstellar gas shells around these stars. Observations of the MnI 4030-4033 A lines are used to show that circumstellar shell absorption is too weak to explain the asymmetry. It is suggested that the absorption occurs in a cool turbulent region between the base of the circumstellar shell and the top of the chromosphere.
    Keywords: ASTRONOMY
    Type: NASA-CR-142815
    Format: application/pdf
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