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Träfflista för sökning "WFRF:(Zheng J) srt2:(1991-1994)"

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1.	Clavel, J., et al. (author) Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I. An 8 month campaign of monitoring NGC 5548 with IUE 1991 In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 366:1, s. 64-8181 Journal article (peer-reviewed)abstract The authors present emission-line and ultraviolet continuum observations of a type I Seyfert galaxy in which the time resolution is adequate for describing the character of variability. Using the IUE satellite, the nucleus of NGC 5548 was observed every 4 days for a period of 8 months. Its mean properties-continuum shape, line ratios-are not unusual for type I Seyfert galaxies, but it was found to be strongly variable. The ultraviolet continuum flux and broad emission line fluxes varied significantly, going through three large maxima and three deep minima. The great majority of all variations were well resolved in time. The data lend qualitative support to the view that photoionization by the nuclear continuum is responsible for driving the emission lines
2.	Li, Zheng, et al. (author) Minimum Variance Prediction for Linear Time-Varying Systems 1994 In: IFAC Proceedings Volumes. ; 27:8 Conference paper (peer-reviewed)abstract In this paper we study the problem of minimum variance prediction for linear time-varying systems. We consider the standard time-varying autoregression moving average (ARMA) model and develop a predictor which guarantees minimum variance prediction for a large class of linear time-varying systems. The predictor is developed based on a pseudocommutation technique for dealing with noncommutativity of linear time-varying operators in a transfer operator framework. We also show connections between this input-output predictor and the Kalman predictor via an example.

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Type of publication: conference paper (1); journal article (1)

Type of content: peer-reviewed (2)

Author/Editor: Beck, S (1); Perez, E. (1); Giommi, P. (1); Zheng, W. (1); O'Brien, P. (1); Smith, P. S. (1); show more...; Sadun, A. C. (1); Lasota, J.-P. (1); Pelat, D. (1); Wittenmark, Björn (1); Martin, P. G. (1); Clavel, J (1); Li, Zheng (1); Halpern, J. P. (1); Mazeh, T. (1); Malkan, M. A. (1); Filippenko, A. V. (1); Fricke, K. (1); Reichert, G. A. (1); Alloin, D. (1); Crenshaw, D. M. (1); Kriss, G. (1); Krolik, J. H. (1); Netzer, H. (1); Peterson, B. M. (1); Wamsteker, W. (1); Altamore, A. (1); Baribaud, T. (1); Barr, P. (1); Binette, L. (1); Bromage, G. E. (1); Brosch, N. (1); Diaz, A. I. (1); Gaskell, C. M. (1); Glass, I. S. (1); Gondhalekar, P. (1); Hackney, R. L. (1); Hutter, D. J. (1); Jorsater, S. (1); Kinney, A. L. (1); Kollatschny, W. (1); Koratkar, A. (1); Korista, K. T. (1); Laor, A. (1); Leibowitz, E. (1); Maoz, D. (1); Meurs, E. J. A. (1); Nair, A. D. (1); Perola, G. C. (1); Ptak, R. L. (1); show less...

University: Uppsala University (1); Lund University (1)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (1); Engineering and Technology (1)

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