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  • Fluid Mechanics and Heat Transfer  (2)
  • Cell & Developmental Biology
  • 1995-1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Human senescence (1996)
    New York, NY : Wiley-Blackwell
    BioEssays 18 (1996), S. 1009-1016 
    Details
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Human life expectancy has increased dramatically through improvements in public health, housing, nutrition and general living standards. Lifespan is now limited chiefly by intrinsic senescence and its associated frailty and diseases. Understanding the biological basis of the ageing process is a major scientific challenge that will require integration of molecular, cellular, genetic and physiological approaches. This article reviews progress that has been made to date, particularly with regard to the genetic contribution to senescence and longevity, and assesses the scale of the task that remains.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bies.950181211
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Efficient Parallel Algorithm For Direct Numerical Simulation of Turbulent Flows (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A distributed algorithm for a high-order-accurate finite-difference approach to the direct numerical simulation (DNS) of transition and turbulence in compressible flows is described. This work has two major objectives. The first objective is to demonstrate that parallel and distributed-memory machines can be successfully and efficiently used to solve computationally intensive and input/output intensive algorithms of the DNS class. The second objective is to show that the computational complexity involved in solving the tridiagonal systems inherent in the DNS algorithm can be reduced by algorithm innovations that obviate the need to use a parallelized tridiagonal solver.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA-TP-3686 , NAS 1.60:3686 , L-17638
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The structure of variable property, compressible mixing layers in binary gas mixtures (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: We present the results of a study of the structure of a parallel compressible mixing layer in a binary mixture of gases. The gases included in this study are hydrogen (H2), helium (He), nitrogen (N2), oxygen (02), neon (Ne) and argon (Ar). Profiles of the variation of the Lewis and Prandtl numbers across the mixing layer for all thirty combinations of gases are given. It is shown that the Lewis number can vary by as much as a factor of eight and the Prandtl number by a factor of two across the mixing layer. Thus assuming constant values for the Lewis and Prandtl numbers of a binary gas mixture in the shear layer, as is done in many theoretical studies, is a poor approximation. We also present profiles of the velocity, mass fraction, temperature and density for representative binary gas mixtures at zero and supersonic Mach numbers. We show that the shape of these profiles is strongly dependent on which gases are in the mixture as well as on whether the denser gas is in the fast stream or the slow stream.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA-CR-198337 , NAS 1.26:198337 , ICASE-96-36
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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