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Digitale Medien

Global Oscillations at Low Frequency from the SOHO mission (GOLF) (1995)

Gabriel, A. H. ; Grec, G. ; Charra, J. ; [weitere]

Springer

Solar physics 162 (1995), S. 61-99

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ISSN: 1573-093X

Schlagwort(e): sun ; helioseismology

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The GOLF experiment on the SOHO mission aims to study the internal structure of the sun by measuring the spectrum of global oscillations in the frequency range 10−7 to 10−2 Hz. Bothp andg mode oscillations will be investigated, with the emphasis on the low order long period waves which penetrate the solar core. The instrument employs an extension to space of the proven ground-based technique for measuring the mean line-of-sight velocity of the viewed solar surface. By avoiding the atmospheric disturbances experienced from the ground, and choosing a non-eclipsing orbit, GOLF aims to improve the instrumental sensitivity limit by an order of magnitude to 1 mm s−1 over 20 days for frequencies higher than 2.10−4 Hz. A sodium vapour resonance cell is used in a longitudinal magnetic field to sample the two wings of the solar absorption line. The addition of a small modulating field component enables the slope of the wings to be measured. This provides not only an internal calibration of the instrument sensitivity, but also offers a further possibility to recognise, and correct for, the solar background signal produced by the effects of solar magnetically active regions. The use of an additional rotating polariser enables measurement of the mean solar line-of-sight magnetic field, as a secondary objective.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00733427

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Digitale Medien

Syntheses of Zindoxifene and Analogues by Titanium-Induced Oxo-Amide Coupling (1994)

fürstner, Alois ; Jumbam, Denis N. ; Seidel, Günter

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1125-1130

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ISSN: 0009-2940

Schlagwort(e): Indoles, 2-aryl- ; Titanium graphite ; Zindoxifene ; Tumor-growth inhibitors ; Alkylidenation, intramolecular ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Highly reactive titanium on graphite is used to reductively cyclize electron-rich acylamino carbonyl compounds 7, 8, 12, 14, and 16 to the corresponding indole derivatives 9, 10, 13, 15, and 17. Compound 9b is a known precursor of the mammary tumor-inhibiting compound zindoxifene (2). The other products are new analogues of this anticancer drug, exhibiting the substitution pattern previously recognized to be essential for high pharmacological activity.