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  • Weitere Quellen  (20)
  • AERODYNAMICS  (10)
  • ASTROPHYSICS  (10)
  • Chemistry
  • 1985-1989  (6)
  • 1975-1979  (14)
  • 1
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    Rotor wake characteristics of a transonic axial-flow fan (1986)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal (ISSN 0001-1452); 24; 1802-181
    Format: text
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  • 2
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    Vortex shedding in high-speed compressor blade wakes (1988)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: The wakes of highly loaded compressor blades are generally considered to be turbulent flows. Recent work has suggested that the blade wakes are dominated by a vortex streetlike structure. The experimental evidence supporting the wake vortex structure is reviewed. This structure is shown to redistribute thermal energy within the flowfield. The effect of the wake structure on conventional aerodynamic measurements of compressor performance is noted. A two-dimensional, time-accurate, viscous numerical simulation of the flow exhibits both vortex shedding in the wake and a lower-frequency flow instability that modulates the shedding. The numerical results are shown to agree quite well with the measurement from transonic compressor rotors.
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Propulsion and Power (ISSN 0748-4658); 4; 236-244
    Format: text
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  • 3
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    NGC 1275 /3C 84/ - Similar structure in the optical and 3-mm radio variations (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Optical and 3.3-mm data for the Seyfert galaxy NGC 1275 (3C 84) are compared. Similarities exist between the variations at the two wavelengths with regard to amplitude, time scale, and interval between events. The question is raised whether these similarities may be the result of a common triggering mechanism.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomical Society of the Pacific; vol. 91
    Format: text
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  • 4
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    Active suppression of compressor instabilities (1986)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: A strategy is proposed for controlling aerodynamic instabilities which limit the useful range of both axial and centrifugal turbomachines. Both local and global instabilities (incipient rotating stall and surge) are analyzed. A theory is developed which shows how an additional disturbance, driven from real time data measured within the machine, can be generated so as to realize a device with characteristics fundamentally different from those of the turbomachine without control; for the particular compressor analyzed, the control led to a 20 percent increase in the extent of the stable operating range. The use of structural dynamics to enhance stability is also discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 86-1914
    Format: text
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  • 5
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    Rotor wake characteristics of a transonic axial flow fan (1985)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: State of the art turbomachinery flow analysis codes are not capable of predicting the viscous flow features within turbomachinery blade wakes. Until efficient 3D viscous flow analysis codes become a reality there is therefore a need for models which can describe the generation and transport of blade wakes and the mixing process within the wake. To address the need for experimental data to support the development of such models, high response pressure measurements and laser anemometer velocity measurements have been obtained in the wake of a transonic axial flow fan rotor.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 85-1133
    Format: text
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  • 6
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    High-resolution X-ray observations of the Cassiopeia A supernova remnant with the Einstein Observatory (1979)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Cas A was observed with the imaging detectors on the Einstein X-ray Observatory. The mass of the expanding shell due to the interaction of the blast wave and the ambient medium is determined. This indicates that Cas A is probably not in the free expansion phase, but has not yet reached the adiabatic phase of expansion. Detailed comparison of X-ray, optical, and radio images shows various degrees of correlation, indicating that several processes for emission are present. An upper limit of 1,500,000 K is established for any stellar remnant that is below the expected temperature of a neutron star by a factor of about 5. The total mass of the SNR is found to be 10-30 solar masses
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 234
    Format: text
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  • 7
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    The generation of gravitational radiation by escaping supernova neutrinos (1978)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Formulae for the gravitational radiation due to the anisotropic axisymmetric emission of neutrinos from a small source are derived. We find that a burst of neutrinos released anisotropically from a supernova will generate a burst of gravitational radiation that may be comparable in amplitude and energy to the gravitational radiation generated by the fluid motion in the collapse of the supernova core.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 223
    Format: text
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  • 8
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    Effects of primordial fluctuations on the abundances of light elements (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Some of the effects of primordial inhomogeneities on the production of H-2, He-3, and Li-7 are investigated. For the most part, temperature fluctuations have only small effects on the abundances. The density fluctuations are modeled by a unimodal distribution so that the Universe is characterized by the mean density and the relative amplitude of the density variations. It has been found that the constraint which H-2 production imposes on the mean mass density is eased somewhat by allowing for density inhomogeneities. However, unless the composition of the interstellar matter is atypical of most of the matter in the Universe, the mass density will be at least a factor of 3 below the critical density. For reasonable estimates of the pregalactic abundances, sufficient He-3 and Li-7 cannot be produced in the same model universe. Production of both Li-7 and H-2 requires large-amplitude primordial fluctuations, while sufficient He-3 and H-2 can be formed in very low-density, fairly homogeneous universes.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; 197; Apr. 15
    Format: text
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  • 9
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    ANS observations of Cygnus X-1 (1976)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Cygnus X-1 was observed from 3 November until 9 November 1974, using the hard X-ray (1-28 keV) and soft X-ray (1-8 keV) experiment on board the Astronomical Netherlands Satellite. On three occasions, on 4 and 5 November, the X-ray spectrum was observed to be harder, while the flux intensity in the 1-7 keV ranges decreased by about 50% from its quiescent value. These events occurred near and following the time of superior conjunction of the likely optical counterpart HDE 226 868. These events appear to be the same as previously reported absorption dips and reveal this phenomenon to be more complex than had been believed. A systematic study of the X-ray spectral variations in these energy bands, on a time scale of 64 seconds over the period of the spectroscopic binary, is presented.
    Schlagwort(e): ASTROPHYSICS
    Format: text
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  • 10
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    The binary pulsar - Post-Newtonian timing effects (1977)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Certain post-Newtonian effects may be observable in the arrival times of pulses from the binary pulsar PSR 1913+16. Such effects include the gravitational propagation delay and the post-Newtonian corrections to the elliptical binary orbit. Fitting a model of these effects as they are predicted by general relativity to the pulse arrival times permits the estimation of more parameters than are necessary to determine the orbit and masses of the system. This redundancy provides an important check of the assumption that the observed periastron precession rate is entirely due to the effect of general relativity on compact masses.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 216
    Format: text
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