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  • ASTROPHYSICS  (1,248)
  • General Chemistry  (1,203)
  • FLUID MECHANICS AND HEAT TRANSFER  (831)
  • Fisheries
  • 2020-2022
  • 1990-1994  (3,284)
  • 1960-1964
  • 1992  (3,284)
Collection
Keywords
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  • 2020-2022
  • 1990-1994  (3,284)
  • 1960-1964
Year
  • 1
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    Low gravity quenching of hot tubes with cryogens (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: An experimental proceedure for examining flow boiling in low gravity environment is presented. The proceedure involves both ground based and KC-135 flight experiments. Two experimental apparati were employed, one for studying subcooled liquid boiling and another for examining saturated liquid boiling. For the saturated flow experiments, liquid nitrogen was used while freon 113 was used for the subcooled flow experiments. The boiling phenomenon was investigated in both cases using flow visualization techniques as well as tube wall temperature measurements. The flow field in both cases was established by injecting cold liquid in a heated tube whose temperature was set above the saturation values. The tubes were both vertically and horizontally supported with the liquid injected from the lower end of the tube. The results indicate substantial differences in the flow patterns established during boiling between the ground based, (1-g), experiments and the flight experiments, (low-g). These differences in the flow patterns will be discussed and some explanations will be offered.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ; : Algorithmic trends
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  • 2
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    Simulation of particle mixing by turbulent convective flows on the connection machine (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Mixing of particles by chaotic flow fields was simulated on the Connection Machine. Each cell was assigned to the processor, and the coordinates of particles residing on the cell were kept in the local memory of the processor. This approach implies the exchange between the local memories, when a particle moves from one cell to another. Approximately 10 exp 5 particles were injected into a time-dependent flow field obtained by solving the nonlinear system of partial differential equations describing turbulent thermal convection. The flow field was calculated on a CRAY, and data were transferred to a CM-200 through a high-speed HIPPI channel.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: In: Supercomputing '92; Proceedings of the Conference, Minneapolis, MN, Nov. 16-20, 1992 (A94-10682 01-62); p. 294-300.
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  • 3
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    On the decay of the magnetic fields of single radio pulsars (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We investigate the statistical evidence for the decay of the magnetic field of single radio pulsars. We perform population syntheses for different assumed values for the time scale of field decay using a Monte Carlo method. We allow for the selection effects in pulsar surveys and compare the synthesized populations with the observed pulsars. We take account of the finite scale height of the distribution in the Galaxy of free electrons, which determine the dispersion measure and hence the apparent distance of radio pulsars. Our simulations give much better agreement with the observations if the time scale for the field decay is assumed to be longer than the typical active life time of a radio pulsar. This indicates that no significant field decay occurs in single radio pulsars.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); p. 198-212.
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  • 4
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    Diagnostics of disk-magnetosphere interaction in neutron star binaries (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The interaction between the magnetospheres of accreting neutron stars and accretion disks plays at key role in determining the properties of many accretion-powered neutron star X-ray sources and the recycled binary and millisecond rotation-powered pulsars. Here we show that the behavior of the horizontal branch quasi-periodic intensity oscillations in low mass X-ray binaries and the correlation between the magnetic fields and periods of binary and millisecond pulsars are sensitive probes of the state of the inner disk.
    Keywords: ASTROPHYSICS
    Type: ; : Problems in the ae
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  • 5
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    COBE DMR results and implications (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: This lecture presents early results obtained from the first six months of measurements of the Cosmic Microwave Background (CMB) by Differential Microwave Radiometers (DMR) aboard COBE and discusses significant cosmological implications. The DMR maps show the dipole anisotropy and some galactic emission but otherwise a spatially smooth early universe. The measurements are sufficiently precise that we must pay careful attention to potential systematic errors. Maps of galactic and local emission such as those produced by the FIRAS and DIRBE instruments will be needed to identify foregrounds from extragalactic emission and thus to interpret the results in terms of events in the early universe. The current DMR results are significant for Cosmology.
    Keywords: ASTROPHYSICS
    Type: In: The infrared and submillimetre sky after COBE; Proceedings of the NATO Advanced Study Institute, Les Houches, France, Mar. 20-30, 1991 (A93-51701 22-90); p. 331-344.
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  • 6
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    Finite-element solution scheme for compressible viscous flow (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Adaptivity offers the possibility of using FEM for problems that are otherwise intractable. The solution algorithm is combined with an adaptive approach in which the unstructured portion of the grid is adaptively regenerated as the solution proceeds; the structured portion of the mesh is modified accordingly, to ensure both compatibility along the interface between the implicit and explicit element groups and increased resolution of the viscous layer. The approach offers significant computational savings in 3D simulations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: In: Finite elements in fluids. Vol. 8 (A93-45962 19-34); p. 47-73.
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  • 7
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    The origin of the extremely metal-poor post-AGB stars (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Certain A-F supergiants show almost solar photospheric abundances of C, N, O, S, and Zn, while Fe, Mg, Ca, Si, Cr, and other elements are more than two orders of magnitude below solar. We suggest that the present photosphere was originally solar in composition; the missing elements were incorporated into dust grains that were separated from the atmosphere. The heavy-element-depleted gas comprises the present photosphere. There are two possible mechanisms by which this process might take place: capture by the presently visible star of the depleted gas from a binary companions, or the rapid termination of a vigorous stellar wind in a single star, so that the grains are blown outward through the expanding envelope. Besides the abundance peculiarities, the hypothesis explains why some objects have carbon-rich dust outside of an oxygen rich photosphere, why these stars have the rather narrow range of (T(eff), log g) near (7000 K, 1.0), and why some might have a great deal of circumstellar dust while others have little. Perhaps the most serious objection to the hypothesis is the possible presence of stellar winds observed in the winds of the peculiar post-AGB stars themselves.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 259; 2; p. L39-L42.
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  • 8
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    Particle acceleration at comets (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: This paper compares calculated and measured energy spectra of implanted H(+) and O(+) ions on the assumption that the pickup geometry is quasi-parallel and about 1 percent of the waves generated by the cometary pickup process propagates backward (towards the comet). The model provides a good description of the implanted O(+) and H(+) energy distribution near the pickup energies.
    Keywords: ASTROPHYSICS
    Type: In: Particle acceleration in cosmic plasmas; Proceedings of the Workshop, Bartol Research Inst., Newark, DE, Dec. 4-6, 1991 (A93-39976 16-93); p. 267-272.
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  • 9
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    Constraints on dark matter from intergalactic radiation (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Several of the dark matter candidates that have been proposed are believed to be unstable to decay, which would contribute photons to the radiation field between galaxies. The main candidates of this type are light neutrinos and axions, primordial mini-black holes, and a nonzero 'vacuum' energy. All of these can be constrained in nature by observational data on the extragalactic background light and the microwave background radiation. Black holes and the vacuum can be ruled out as significant contributors to the 'missing mass'. Light axions are also unlikely candidates; however, those with extremely small rest energies (the so-called 'invisible' axions) remain feasible. Light neutrinos, like those proposed by Sciama, are marginally viable. In general, we believe that the intergalactic radiation field is an important way of constraining all types of dark matter.
    Keywords: ASTROPHYSICS
    Type: Vistas in Astronomy (ISSN 0083-6656); 35; p. 439-478.
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  • 10
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    Non-linear effects of QED multiple-photon processes on cyclotron spectra (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The relativistic magnetic resonant multiple-photon processes are discussed up to order alpha(f)exp 2, in particular two-photon scattering and two-photon emission. The latter also contributes to the opacity and photon production, although more weakly than the scattering. These processes are nonlinear in the radiation field, and therefore the transfer depends sensitively on the cross sections. We show model spectra including three cyclotron harmonics for the accreting pulsar Her X-1 and the gamma-ray burster GB880205. The lines are highly polarized, and their depth is sensitive to the polarization treatment.
    Keywords: ASTROPHYSICS
    Type: In: Gamma-ray bursts - Observations, analyses and theories (A93-20206 06-90); p. 369-376.
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