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  • ASTROPHYSICS  (7)
  • AIRCRAFT PROPULSION AND POWER  (5)
  • 25.40.Ep  (1)
  • COMPUTER PROGRAMMING AND SOFTWARE  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    T=1, spin-dipole strength in40Ca (1989)
    Springer
    The European physical journal 333 (1989), S. 39-43 
    Details
    ISSN: 1434-601X
    Keywords: 24.30 ; 24.30.CZ ; 25.40.Ep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spin-dipole strength in40Ca has been studied by inelastic scattering of 500-MeV protons and the dipole response in40Ca is compared with the spin-dipole data from the40Ca(p, n) reaction and nonspin-dipole data from photonuclear studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290108
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Assessment of Variable-Cycle Engines for Supersonic Transports (1976)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Propulsion systems are evaluated in terms of relative aircraft range for a fixed payload and takeoff gross weight with a design cruise Mach number of 2.7. In order to put the performance of these engines in perspective, a comparison of these engines and the former U.S. SST engine is made with an idealized variable cycle engine whose performance at all operating points matches that of an optimized point design cycle within specified limits. Range comparisons are made with and without noise level constraints to determine the influence of noise upon cycle selection. The critical areas requiring new or improved technology for each cycle are delineated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AGARD Variable Geometry and Multicycle Eng.; 19 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A cooling flow cluster at redshift z = 0.2 (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The cluster of galaxies 1E0839.9 + 2938, discovered in X-ray observations by Nesci et al. (1988), is characterized on the basis of VLA 6-cm radio observations, Whipple Observatory CCD photometry, and spectroscopic observations obtained with the Multiple Mirror Telescope and the 88-inch University of Hawaii Telescope at Mauna Kea. The data are presented in tables, maps, and sample images and spectra and briefly characterized. The bright X-ray object is identified with a cluster at redshift z = 0.195; its central galaxy has radio emission of 1.1 x 10 exp 24 W/Hz as well as strong optical line emission which is not restricted to its nucleus. It is concluded that 1E0839.9 + 2938 is a cooling-flow cluster similar to 3C295 (found at z = 0.461 by Henry et al., 1986). The need for space observations (by Rosat or the AXAF) to determine the object's X-ray luminosity distribution is indicated.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Performance estimation for highly loaded six and ten blade propellers combined with an advanced technology turboshaft engine (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Performance estimations, weights, and scaling laws for the six blade and ten blade highly loaded propellers combined with an advanced turboshaft engine are presented. These data are useful for aircraft mission studies using the turboprop system. Comparisons are made between the performance of post 1980 technology turboprop propulsion systems and the performance of both a current technology turbofan and a post 1990 technology turbofan.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-81840
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Computer Program for the Design and Off-Design Performance of Turbojet and Turbofan Engine Cycles (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The rapid computer program is designed to be run in a stand-alone mode or operated within a larger program. The computation is based on a simplified one-dimensional gas turbine cycle. Each component in the engine is modeled thermo-dynamically. The component efficiencies used in the thermodynamic modeling are scaled for the off-design conditions from input design point values using empirical trends which are included in the computer code. The engine cycle program is capable of producing reasonable engine performance prediction with a minimum of computer execute time. The current computer execute time on the IBM 360/67 for one Mach number, one altitude, and one power setting is about 0.1 seconds. about 0.1 seconds. The principal assumption used in the calculation is that the compressor is operated along a line of maximum adiabatic efficiency on the compressor map. The fluid properties are computed for the combustion mixture, but dissociation is not included. The procedure included in the program is only for the combustion of JP-4, methane, or hydrogen.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-78653
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Performance estimation for a highly loaded eight-blade propeller combined with an advanced technology turboshaft engine (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Performance estimation, weights, and scaling laws for an eight-blade highly loaded propeller combined with an advanced turboshaft engine are presented. The data are useful for planned aircraft mission studies using the turboprop propulsion system. Comparisons are made between the performance of the 1990+ technology turboprop propulsion system and the performance of both a current technology turbofan and an 1990+ technology turbofan.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-80075
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    INTERP3: A computer routine for linear interpolation of trivariate functions defined by nondistinct unequally spaced variables (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A report on the computer routine INTERP3 is presented. The routine is designed to linearly interpolate a variable which is a function of three independent variables. The variables within the parameter arrays do not have to be distinct, or equally spaced, and the array variables can be in increasing or decreasing order.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-80070
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Assessment of Variable-cycle Engines for Mach 2.7 Supersonic Transports (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Three proposed SCAR propulsion systems in terms of aircraft range for a fixed payload and take-off gross weight with a design cruise Mach number 2.7 are evaluated. The effects of various noise and operational restraints are determined and sensitivities to some of the more important performance variables are presented for the most probable design noise and operational restraint case. Critical areas requiring new or improved technology for each cycle are delineated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-X-73977
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    The extended medium sensitivity survey distant cluster sample - X-ray data and interpretation of the luminosity evolution (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The X-ray properties of a cluster of galaxies subsample of the Einstein Extended Medium Sensitivity Survey is described. A summary of this sample and its implication has been presented previously; this paper gives the full details. The cluster subsample is 98.4 percent identified and contains 93 X-ray-selected clusters to a redshift of 0.58. The cluster X-ray luminosity function at three cosmic epochs is derived. While the present luminosity function agrees with previous determinations at the lowest redshifts, it is found that the volume density of high-luminosity clusters is greater now than it was in the past. The normalization, shape, and time dependence of the luminosity function can be described by a simple hierarchical formation model with parameters which also describe the temperature function of an independent sample of low-redshift clusters. In this model the comoving hot gas density remains constant with time at least to redshifts of order 0.35.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 386; 408-419
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    X-ray selected high redshift clusters of galaxies (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Studies of the evolution of X-ray emission from clusters of galaxies have so far used distant clusters discovered optically and then observed at X-ray wavelengths (Henry et al., 1982; Henry and Lavery, 1984). A different approach to the study of cluster evolution is to use clusters selected directly by their X-ray emission, since X-ray selection is extremely successful at discovering high-redshift clusters (up to z = 0.5). The Extension of the Medium Sensitivity Survey, a study of serendipitous X-ray sources discovered with the Einstein Imaging Proportional Counter, has so far provided a sample of more than 60 clusters with relatively high redshifts. Upon completion of the identification programs the sample will include over 100 clusters. Here the data currently available are presented, and the basic properties of this new sample of clusters of galaxies are discussed. A preliminary number-counts distribution is also derived.
    Keywords: ASTROPHYSICS
    Type: High redshift and primeval galaxies; Jun 29, 1987 - Jul 03, 1987; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
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