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Träfflista för sökning "WFRF:(Sun W.) 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.	Morse, R., et al. (author) The AMANDA neutrino astronomy project 1993 In: Venice 1993, Neutrino telescopes. ; , s. 309-320 Conference paper (peer-reviewed)
3.	Rönngren, Lars, et al. (author) Surface reactions in aqueous metal sulfide systems : 2. Ion exchange and acid/base reactions at the ZnSH2O interface 1991 In: Journal of Colloid and Interface Science. - 0021-9797 .- 1095-7103. ; 145:2, s. 396-404 Journal article (peer-reviewed)abstract The amphoteric properties of hydrous ZnS surfaces as well as an ion exchange reaction between surface coordinated Zn2+ ions and H+ ions of the aqueous phase have been established. The measurements were performed as potentiometric titrations in 0.1 M NaClO4 medium at 25°C. Besides measuring -log[H+] by using a glass electrode, -log[S2-] was recorded (Ag/Ag2S selective electrode). In addition, the total concentrations of H+, Zn2+, and S were analyzed as a function of -log[H+] of the bulk solution. Synthetically prepared ZnS and the mineral sphalerite were studied. Bro¨nsted acidity constants pK1s = 6.91 and pK2s = 10.28 for synthetic ZnS, and pK1s = 7.14 and pK2s = 10.29 for sphalerite, were established, which implies -log[H+] of zero proton condition equal to 8.60 and 8.72, respectively. Furthermore, the ion exchange reaction ≡SZn + 2H+ ↔ ≡SH2 + Zn2+ was characterized within the range 4 ≤ -log[H+] ≤ 7, with log K = 9.59 and 9.65. Experimental data were evaluated on the basis of the constant capacitance model by using the computer program FITEQL. The "best" fit to experimental data was obtained by assuming no charge dependence of K1s and K2s.
4.	Sun, Zhongxi, et al. (author) Surface Reactions in Aqueous Metal Sulfide Systems. 3 : Ion exchange and acid/base properties of hydrous PbS 1991 In: Colloids and Surfaces. - 0166-6622 .- 1873-4340. ; 59, s. 243-254 Journal article (peer-reviewed)

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Type of publication: journal article (3); conference paper (1)

Type of content: peer-reviewed (4)

Author/Editor: Sjöberg, Staffan (2); Forsling, Willis (2); Beck, S (1); Richards, A. (1); Perez, E. (1); Barwick, S. W. (1); show more...; Halzen, F. (1); Morse, R. (1); Price, P. B. (1); Tilav, S. (1); Walck, C. (1); Yodh, G. (1); Jacobsen, J. (1); Engel, K. (1); Giommi, P. (1); Hulth, P. O. (1); Zheng, W. (1); Porrata, R. (1); O'Brien, P. (1); Smith, P. S. (1); Sadun, A. C. (1); Carius, Staffan (1); Lasota, J.-P. (1); Pelat, D. (1); Liubarsky, I. (1); Bouchta, A. (1); Gray, L (1); Martin, P. G. (1); Clavel, J (1); Sun, Q. (1); Schneider, E (1); Goobar, A. (1); Lowder, D. M. (1); Kandhadai, V. (1); Miller, T. (1); Erlandsson, B. (1); Westphal, A (1); Halpern, J. P. (1); Mazeh, T. (1); Malkan, M. A. (1); Coulthard, 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); show less...

University: Luleå University of Technology (2); Uppsala University (1); Linnaeus University (1)

Language: English (4)

Research subject (UKÄ/SCB): Natural sciences (4)

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