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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen ion dependence of the oxidation of iron(II) with peroxydisulfate in acid perchlorate solutions (1981)
    s.l. : American Chemical Society
    Inorganic chemistry 20 (1981), S. 454-457 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50216a027
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of the iron(III)-catalyzed oxidation of hydrazine with peroxydisulfate in acid medium (1981)
    s.l. : American Chemical Society
    Inorganic chemistry 20 (1981), S. 1748-1751 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50220a027
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  • 3
    Electronic Resource
    Electronic Resource
    On the eruption of prominences and disappearance of quiescent filaments (1995)
    Springer
    Solar physics 158 (1995), S. 259-268 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We suggest the following heuristic model for the evolution of a quiescent filament. The middle part of the filament rises due to heating, while its ends remain anchored in the chromosphere; and a kink appears in the Hα filament due to projection and line-of-sight effects. Further, the top segment of the filament rises rapidly above the solar surface 1–2 days before the disappearance of a filament or eruption of a prominence. The top of the filament attains a high temperature due to further heating, thereby becoming invisible in Hα, giving the impression that the filament has split into two parts. It is expected that this gap between the Hα filament can be seen in the observations in high-temperature lines and soft X-rays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00795662
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of Kodaikanal white-light images (1993)
    Springer
    Solar physics 146 (1993), S. 27-47 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A program of digitization of the daily white-light solar images from the Kodaikanal station of the Indian Institute of Astrophysics is in progress. A similar set of white-light data from the Mount Wilson Observatory was digitized some years ago. In both cases, areas and positions of individual sunspot umbrae are measured. In this preliminary report, comparisons of these measurements from the two sites are made. It is shown that both area and position measurements are in quite good agreement. The agreement is sufficiently good that it is possible to measure motions and area changes of sunspots from one site to the next, involving time differences from about 12 hours to about 36 hours. This enables us to trace the motions of many more small sunspots than could be done from one site alone. Very small systematic differences in rotation rate between the two sites of about 0.4% are found. A portion of this discrepancy is apparently due to the difference in plate scales between the two sites. Another contributing factor in the difference is the latitude visibility of sunspots. In addition it is suggested that a small, systematic difference in the measured radii at the two sites may contribute a small amount to this discrepancy, but it has not been possible to confirm this hypothesis. It is concluded that in general, when dealing with high precision rotation results of this sort, one must be extremely careful about subtle systematic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662168
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  • 5
    Electronic Resource
    Electronic Resource
    Ca II K line profile of the truly quiet Sun (1996)
    Springer
    Solar physics 163 (1996), S. 93-97 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract While evaluating the chromospheric variability (solar cycle related or any other) using the Ca II K line (λ3933.684 Å) as an indicator, an essential prerequisite is the knowledge of the profile of a truly quiet Sun in the integrated light. Such a profile can serve as a bench mark over which enhancements can be measured, particularly when modelling variability. This paper describes how such a K-line profile has been derived for the quiet Sun using disc-integrated light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165458
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of magnetic shear, spot, and plage rotation on prominence evolution (1993)
    Springer
    Solar physics 146 (1993), S. 259-276 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the evolution of two dark Hα filaments as prominences during their disk passage from 12 to 19 February, 1992 and 6 to 17 March, 1992, using Kodaikanal Observatory Hα and Caii K spectroheliograms. Both the filaments were well outside the spot regions. However, they were connected to sunspots by small threads. Outside the spot regions, the filaments were also anchored between opposite polarity plage regions. Both the filaments were almost straight in the beginning. However, they acquired a curved shape (inverted U-shape) as the spot and plages underwent rotation. It is shown that rotation of the plage and spot plays an important role in the evolution of prominences, one serving as the anchor and the other imparting necessary shear. Once the shear reaches a critical value it starts unwinding the filaments, resulting in the fine structure of the two prominences studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662013
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  • 7
    Electronic Resource
    Electronic Resource
    Analytical chemistry of benzilic acid (1968)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 233 (1968), S. 20-25 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das analytische Verhalten der Benzilsäure wurde untersucht und festgestellt, daß Natriumbenzilat mit einer großen Anzahl von Metallionen Fällungen ergibt. Zusammensetzung der Niederschläge und Fällungsbedingungen wurden aufgeklärt. Für Zink, Blei und Silber werden Trennungsverfahren beschrieben, die auf der Fällung der Benzilate zusammen mit den anderen Metallen und anschließender Extraktion mit einem organischen Lösungsmittel beruhen.
    Notes: Summary Sodium benzilate is a very versatile reagent as it precipitates a large number of metal ions, most of them quantitatively. The composition of the precipitates and conditions for their quantitative precipitation were found out. A proper use of the reagent was made by co-precipitating metals like zinc, lead and silver, then separating them by organic solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541944
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  • 8
    Electronic Resource
    Electronic Resource
    Chromatographic separation of rare earths and uranium from thorium (1965)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 213 (1965), S. 38-39 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00516108
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  • 9
    Electronic Resource
    Electronic Resource
    Chromatographic separation of Ga, In, Zr and UO2 (1967)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 226 (1967), S. 201-202 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503001
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  • 10
    Electronic Resource
    Electronic Resource
    Microdetermination of uranium (VI) (1967)
    Springer
    Microchimica acta 55 (1967), S. 763-767 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine neue Methode der Trennung und Bestimmung von UO2 2+ neben Cu2+, Zn2+, Ag+, Pb2+, Ga3+, In3+, Tl2+, La3+, Ti4+, Zr4+ und Th4+ wurde ausgearbeitet. Das Natriumsalz der Benzilsäure dient als Färbungs- und Komplexbildungsmittel und n-Butanol zur Extraktion. Alle angeführten Kationen mit Ausnahme von UO2 2+ werden von Benzilsäure gefällt; UO2 2+ bildet einen tiefgelben, mit n-Butanol extrahierbaren Komplex und kann in der organischen Phase spektrophotometrisch bei 430 nm bestimmt werden. Die Trennung kann bei pH 2,6 bis 4,0 durchgeführt werden. Nur wenige Anionen und Kationen stören.
    Abstract: Résumé On développe une nouvelle méthode pour la séparation et l'évaluation de UO2 2+ dans Cu2+, Zn2+, Ag+, Pb2+, Ga3+, In3+, Tl3+, La3+, Ti4+, Zr4+ et Th4+, par le sel de sodium de l'acide benzilique comme agent précipitant et chélatant et le N-butanol comme solvant pour l'extraction par solvant. Tous ces cations, sauf UO2 2+, précipitent par l'acide benzilique; UO2 2+ forme un complexe jaune intense que l'on peut extraire par le N-butanol. On peut doser l'uranium en phase organique par spectrophotométrie à 430 nm. La séparation peut s'effectuer dans le domaine de pH de 2,6 à 4,0. Peu d'anions et de cations interfèrent.
    Notes: Summary A new method has been evolved for the separation and estimation of UO2 2+ from Cu2+, Zn2+, Ag+, Pb2+, Ga3+, In3+, Tl3+, La3+, Ti4+, Zr4+ and Th4+ with the sodium salt of benzilic acid as precipitating and chelating agent andn-butanol as solvent for solvent extraction. All these cations except UO2 2+ are precipitated by benzilic acid; UO2 2+ forms a deep yellow complex extractable byn-butanol. The uranium can be determined in the organic phase spectrophotometrically at 430 nm. The pH range over which the separation can be carried out is 2.6–4.0. Few anions and cations interfere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01224401
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