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  • ASTROPHYSICS  (68)
  • AIRCRAFT PROPULSION AND POWER  (65)
  • 1980-1984
  • 1975-1979  (133)
  • 1935-1939
  • 1975  (133)
  • 1
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    A study of casing treatment stall margin improvement phenomena (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The results of a program of experimental and analytical research in casing treatments over axial compressor rotor blade tips are presented. Circumferential groove, axial-skewed slot and blade angle slot treatments were tested at low speeds. With the circumferential groove treatment the stalling flow was reduced 5.8% at negligible efficiency sacrifice. The axial-skewed slot treatment improved the stalling flow by 15.3%; 1.8 points in peak efficiency were sacrificed. The blade angle slot treatment improved the stalling flow by 15.0%; 1.4 points in peak efficiency were sacrificed. The favorable stalling flow situations correlated well with observations of higher-than-normal surface pressures on the rotor blade pressure surfaces in the tip region, and with increased maximum diffusions on the suction surfaces. Annulus wall pressure gradients, especially in the 50 to 75% chord region, are also increased and blade surface pressure loadings are shifted toward the trailing edge for treated configurations.
    Schlagwort(e): AIRCRAFT PROPULSION AND POWER
    Materialart: ASME PAPER 75-GT-60 , American Society of Mechanical Engineers, Gas Turbine Conference and Products Show; Mar 02, 1975 - Mar 06, 1975; Houston, TX
    Format: text
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  • 2
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    SAS-2 high-energy gamma-ray observations of the Vela pulsar (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The Second Small Astronomy Satellite (SAS-2) high-energy (in excess of 35 MeV) gamma-ray telescope has detected pulsed gamma-ray emission at the radio period from PSR 0833-45, the Vela pulsar, as well as an unpulsed flux from the Vela region. The pulsed emission consists of two peaks following the single radio peak by about 13 ms and 48 ms. The luminosity of the pulsed emission above 100 MeV from Vela is about 0.1 that of the pulsar NP 0532 in the Crab nebula, whereas the pulsed emission from Vela at optical wavelengths is less than 0.0002 that from the Crab. The relatively high intensity of the pulsed gamma-ray emission, and the double peak structure, compared with the single pulse in the radio emission, suggest that the high-energy gamma-ray pulsar emission may be produced under different conditions from those at lower energies.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 200; Sept. 1
    Format: text
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  • 3
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    Na-22, Ne-E, extinct radioactive anomalies and unsupported Ar-40 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The possibility that the origin of extinct radioactivities depended on their living long enough for grains to form in the expanding nucleosynthetic envelope, rather than on their living long enough for meteorites to form, is examined. As an example, the interpretation of Na-22 as a detectable extinct radioactivity, with a half life of only 2.6 years, is explored and related to Ne-22 occurrence. Similar arguments involving He-4, Ar-40, K-40, K-41, and calcium, titanium, chromium, manganese, iron, nickel, and cobalt isotopes are briefly presented.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Nature; 257; Sept. 4
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Pioneer 9 and OGO 5 observations of an interplanetary multiple shock ensemble on February 2, 1969 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A multiple shock system was observed upstream (0.13 AU) of the earth by Pioneer 9 on February 2, 1969. The same system was observed at earth by Ogo 5 and was reported separately in the literature. This paper compares the two sets of observations in still further detail. Both magnetic-field and plasma data are used in a least-squares best-fit method to compute the characteristics of the fast forward shock wave (Pioneer 9 only) and two fast reverse shock waves. Nearly all major features (shock, piston, and tangential discontinuity) retained their characteristics during the transit of the shock ensemble from Pioneer 9 to Ogo 5. The genesis of the ensemble is believed to be due to a complex stream-stream interaction. A substantial density increase (including a large rise of alpha/proton abundance) at Ogo 5, but unobserved at Pioneer 9, is explained by a sudden meridional shift to a flow from below the ecliptic plane while the streams were en route to earth. This study demonstrates a spatial and temporal plasma inhomogeneity which is superimposed on the persistent major features.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Journal of Geophysical Research; 80; Aug. 1
    Format: text
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  • 5
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    High-energy gamma-ray results from the second small astronomy satellite (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Data are reported which were obtained with a high-energy (exceeding 35 Mev) gamma-ray telescope flown on the second Small Astronomy Satellite (SAS-2). The high-energy galactic gamma radiation is observed to dominate over the general diffuse radiation along the entire galactic plane, and its longitudinal and latitudinal distributions appear to be generally correlated with galactic structural features, particularly with arm segments. Principally on the basis of its angular distribution and magnitude, it is suggested that this radiation results primarily from cosmic-ray interactions with interstellar matter. A uniform celestial gamma radiation appears to have been detected; the form of its differential spectrum over the energy range from about 35 to 170 MeV is obtained, and a cosmological origin is suggested for this radiation. In addition to the general galactic emission, high-energy gamma radiation was detected from the Crab Nebula, Vela X, a general region toward the galactic center, and a region located a few degrees north of the galactic plane. Upper limits to the high-energy gamma ray fluxes are set for a number of localized sources.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 198; May 15
    Format: text
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  • 6
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    An upper limit on interstellar C IV in the spectrum of gamma-2 Velorum (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: An upper limit on the column density of C IV along the line of sight to gamma-2 Vel is derived from upper limits placed on the equivalent widths of the interstellar C IV doublet with rest wavelengths at 1548.20 A and 1550.77 A. A lower limit of 250,000 K is calculated for the electron temperature of O VI emitting regions by combining the C IV results with a measurement of the column density of interstellar O VI for the same star and using calculations for the relative ionization of some abundant elements as a function of electron temperature in a low-density plasma. Since gamma-2 Vel is in the central part of the Gum Nebula, the high temperature suggested by these results is shown to support the idea that a high-temperature phase of the interstellar medium, possibly maintained by supernova explosions, may exist.-
    Schlagwort(e): ASTROPHYSICS
    Materialart: The Observatory; 95; Oct. 197
    Format: text
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  • 7
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    Change in the high-energy radiation from the Crab (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: On 1973 July 23, the Cornell gamma-ray telescope had a second exposure to the Crab Nebula and pulsar via balloon flight from Palestine, Texas. On the previous flight, 1971 October 6, the signal from the pulsar had been unmistakably clear, especially at the highest energies (above 800 MeV), and an unpulsed component of similar average power had also been discernible. On the second flight, despite higher altitude, longer exposure, and improved electronics, the pulsed signal was barely detectable and the dc component not observable at all. The drop in intensity seems to increase with energy, being only a factor of 2 at 200 MeV but an order of magnitude at 1 GeV. There is some indication (not compelling) that the gamma-ray flux may have changed even within the 6-hour exposure. The first flight may have viewed the Crab in a state of enhanced high-energy emission correlated with the glitches that occurred on 1971 August 1 and October 25.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 197; Apr. 15
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Identification of the 890 per cm carbonate signature in NGC 7027 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: High-resolution spectroscopic measurements of the 11 micron continuum emission from NGC 7027 indicate that MgCO3 is a constituent of the dust in the nebula. Other carbonate compounds may also be present in concentrations approximately 1 order of magnitude below that of MgCO3. Dust-grain temperatures combined with the abundance of MgCO3 require that most of the material composing the grains must be carbon or C, N, O compounds.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 195; Feb. 1
    Format: text
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  • 9
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    Pulsar fluctuation spectra and the generalized drifting-subpulse phenomenon. II (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Pulsar observations at meter wavelengths have been analyzed to investigate pulse-to-pulse variations and to identify regions of the pulse profile which display distinct statistical properties. Fluctuation spectra of eight recently discovered pulsars are presented along with a description of the drifting-subpulse phenomenon in several objects with quasiperiodic responses in their fluctuation spectra. A quantitative analysis of the drifting-subpulse phenomenon in PSR 0031-07 and PSR 0809+74 is given which emphasizes the broad-band nature of the phenomenon. A summary of the memory exhibited by pulsars with time scales of about 50 periods is given.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 197; Apr. 15
    Format: text
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  • 10
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    Radio detection of interstellar sulfur dioxide (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Interstellar sulfur dioxide (SO2) has been detected in emission from the direction of the Orion Nebula molecular cloud and from Sgr B2. SO2 is the heaviest interstellar molecule detected to date, and the only nonlinear triatomic molecule which does not contain hydrogen. The remarkable Orion emission profiles suggest that two components are supporting the SO2 emission: a dense circumstellar-type envelope, which may be in maser emission, and a warm galactic cloud component.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 198; June 1
    Format: text
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