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  • 1
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    Einstein SSS+MPC observations of Seyfert type galaxies (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The X-ray spectra of 27 Seyfert galaxies measured with the Solid State Spectrometer (SSS) onboard the Einstein Observatory is investigated. This new investigation features the utilization of simultaneous data from the Monitor Proportional Counter (MPC) and automatic correction for systematic effects in the SSS. The new results are that the best-fit single power law indices agree with those previously reported, but that soft excesses are inferred for at least 20 percent of the measured spectra. The soft excesses are consistent with either an approximately 0.25 keV black body or Fe-L line emission.
    Keywords: ASTRONOMY
    Type: ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background; p 1105-1110
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  • 2
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    The identification of a distributed parameter model for a flexible structure (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A computational method is developed for the estimation of parameters in a distributed model for a flexible structure. The structure we consider (part of the RPL experiment) consists of a cantilevered beam with a thruster and linear accelerometer at the free end. The thruster is fed by a pressurized hose whose horizontal motion effects the transverse vibration of the beam. The Euler-Bernoulli theory is used to model the vibration of the beam and treat the hose-thruster assembly as a lumped or point mass-dashpot-spring system at the tip. Using measurements of linear acceleration at the tip, it is estimated that the parameters (mass, stiffness, damping) and a Voight-Kelvin viscoelastic structural damping parameter for the beam using a least squares fit to the data. Spline based approximations to the hybrid (coupled ordinary and partial differential equations) system are considered; theoretical convergence results and numerical studies with both simulation and actual experimental data obtained from the structure are presented and discussed.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-178199 , ICASE-86-71 , NAS 1.26:178199
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  • 3
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    A comparison of star formation characteristics in different types of irregular galaxies (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two regions of recent star formation in blue irregular galaxies were observed with the IUE in the short wavelength, low dispersion mode. The spectra indicates that the massive star content is similar in these regions and is best fit by massive stars formed in a burst and now are approximately 2.5 to 3.0 million years old.
    Keywords: ASTRONOMY
    Type: NASA-TM-88779 , NAS 1.15:88779
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  • 4
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    Analysis of regularized Navier-Stokes equations, 2 (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A practically important regularization of the Navier-Stokes equations was analyzed. As a continuation of the previous work, the structure of the attractors characterizing the solutins was studied. Local as well as global invariant manifolds were found. Regularity properties of these manifolds are analyzed.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-181801 , ICASE-89-14 , NAS 1.26:181801 , AD-A206511
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  • 5
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    A new approach to the solution of boundary value problems involving complex configurations (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new approach for solving certain types of boundary value problems about complex configurations is presented. Numerical algorithms from such diverse fields as finite elements, preconditioned Krylov subspace methods, discrete Fourier analysis, and integral equations are combined to take advantage of the memory, speed and architecture of current and emerging supercomputers. Although the approach has application to many branches of computational physics, the present effort is concentrated in areas of Computational Fluid Dynamics (CFD) such as steady nonlinear aerodynamics, time harmonic unsteady aerodynamics, and aeroacoustics. The most significant attribute of the approach is that it can handle truly arbitrary boundary geometries and eliminates the difficult task of generating surface fitted grids.
    Keywords: NUMERICAL ANALYSIS
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  • 6
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    Algebra and topology for applications to physics (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The principal concepts of algebra and topology are examined with emphasis on applications to physics. In particular, attention is given to sets and mapping; topological spaces and continuous mapping; manifolds; and topological groups and Lie groups. The discussion also covers the tangential spaces of the differential manifolds, including Lie algebras, vector fields, and differential forms, properties of differential forms, mapping of tangential spaces, and integration of differential forms.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TT-20056 , NAS 1.77:20056
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  • 7
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    Development of the EXITE detector - A new imaging detector for 20 - 300 keV astronomy (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The development and testing of a detector to be used in the Energetic X-ray Imaging Telescope Experiment (EXITE) are reported. It consists of a 34 cm diameter NaI(Tl) crystal coupled directly to a single large image intensifier tube with associated silicon PIN diode readout. The measured spatial and energy resolutions at 122 keV are 6mm (FWHM) and 9 percent (FWHM), respectively. This energy resolution is about 50 percent better than that of any previously flown hard X-ray experiment. These resolutions decrease with the square root of the energy of the incident X-ray, indicating that they are determined by the number of photons emitted in the NaI(Tl) scintillator light flash.
    Keywords: ASTRONOMY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-33; 735-740
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  • 8
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    Solving rational matrix equations in the state space with applications to computer-aided control-system design (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A method of solving a class of linear matrix equations over various rings is proposed, using results from linear geometric control theory. An algorithm, successfully implemented, is presented, along with non-trivial numerical examples. Applications of the method to the algebraic control system design methodology are discussed.
    Keywords: NUMERICAL ANALYSIS
    Type: International Journal of Control (ISSN 0020-7179); 43; 65-90
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  • 9
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    The energetic X-ray imaging telescope experiment (EXITE) (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A new position-sensitive scintillation detector (NaI(Tl)), coded mask, and precision pointing system (resolution less than 1 arcmin) are being developed for balloon-borne imaging and spectral studies of cosmic X-ray sources in the 20-300 keV band. The scientific objectives of EXITE, as well as the general design of the detector, telescope and balloon gondola systems are presented.
    Keywords: ASTRONOMY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-33; 750-754
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  • 10
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    The AXAF high resolution camera (HRC) and its use for observations of distant clusters of galaxies (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The High Resolution Camera being developed for AXAF is briefly described, comparing it with its predecessor, the Einstein HRI, and providing preliminary performance data. The HRC is a 10 cm x 10 cm detector with CsI coated microchannel plates providing a large field of view device with high X-ray quantum efficiency. The overall sensitivity of the HRC on AXAF is about 50 times that of the Einstein HRI. An example of the power of this instrument is discussed in the context of studies of distant clusters of galaxies. The HRC can detect individual galaxies in a cluster of redshift 1, if they are similar to the early-type galaxies in nearby clusters that have been observed by the Einstein instruments. The HRC will be used to measure the luminosity function for clusters of galaxies as a function of their distance up to a redshift of 1. This will allow observation of evolutionary effects in clusters as a whole, while the detection of individual galaxies will permit studies of galaxy evolution in a cluster environment.
    Keywords: ASTRONOMY
    Type: Astrophysical Letters and Communications (ISSN 0888-6512); 26; 1-2
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