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  • Spektralphotometrie  (5)
  • PACS. 02.50.Ey Stochastic processes – 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 89.90.+n Other topics in areas of applied and interdisciplinary physics  (2)
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  • 2020-2022
  • 2000-2004  (2)
  • 1975-1979
  • 1945-1949  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Empirical properties of the variety of a financial portfolio and the single-index model (2001)
    Springer
    The European physical journal 20 (2001), S. 503-509 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 02.50.Ey Stochastic processes – 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 89.90.+n Other topics in areas of applied and interdisciplinary physics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We investigate the variety of a portfolio of stocks in normal and extreme days of market activity. We show that the variety carries information about the market activity which is not present in the single-index model and we observe that the variety time evolution is not time reversal around the crash days. We obtain the theoretical relation between the square variety and the mean return of the ensemble return distribution predicted by the single-index model. The single-index model is able to mimic the average behavior of the square variety but fails in describing quantitatively the relation between the square variety and the mean return of the ensemble distribution. The difference between empirical data and theoretical description is more pronounced for large positive values of the mean return of the ensemble distribution. Other significant deviations are also observed for extreme negative values of the mean return.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170229
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  • 2
    Electronic Resource
    Electronic Resource
    Langevin dynamics of financial systems: A second-order analysis (2001)
    Springer
    The European physical journal 22 (2001), S. 123-127 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 02.50.Ey Stochastic processes – 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 89.90.+n Other topics in areas of applied and interdisciplinary physics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We address the issue of stock market fluctuations within Langevin Dynamics (LD) and the thermodynamics definitions of multifractality in order to study its second-order characterization given by the analogous specific heat Cq, where q is an analogous temperature relating the moments of the generating partition function for the financial data signals. Due to non-linear and additive noise terms within the LD, we found that Cq can display a shoulder to the right of its main peak as also found in the S&P500 historical data which may resemble a classical phase transition at a critical point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011127
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photometrische Bestimmung von Benzylhydrazin und Phenelzin (1947)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 325-328 
    Details
    ISSN: 1618-2650
    Keywords: Best. Von Benzylhydrazin und phenelzin ; Spektralphotometrie ; Reaktion mit Glutacondialdehyd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Glutacondialdehyd, hergestellt aus Pyridylpyridiniumdichlorid und Natronlauge, reagiert, wenn er im Überschuß vorliegt, in saurer Lösung mit den Monoaminoxydasehemmern Benzylhydrazin und Phenelzin unter Bildung roter Kondensationsprodukte. Diese Farbreaktion bildet die Grundlage der photometrischen Bestimmungsverfahren, bei denen 0,6–100 nMol/ml der Hydrazinderivate bestimmt werden können. Bei 2 nMol/ml betragen die Variationskoeffizienten 3,2 Rel-% für Benzylhydrazin und 5,2 Rel-% für Phenelzin.
    Notes: Abstract Benzylhydraine and phenelzine both of which are inhibitors of monoaminoxidase reactions form red condensation products in their reaction with glutacondialdehyde. The latter compound which was prepared from pyridylpyridinium dichloride and sodium hydroxide has to be in excess concentration. This colour reaction is used in a photometric method to determine 0.6 to 100 nmole/ml of the hydrazine derivatives. The variation coefficients at 2 nmole/ml are 3.2 and 5.2% rel. for benzylhydrazine and phenelzine, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423799
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    New method for the spectrophotometric determinations of ascorbic acid and dehydroascorbic acid (1947)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 334-336 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Ascorbinsäure und Dehydroascorbinsäure in Pharmazeut. Produkten ; Spektralphotometrie ; Dimethylphenylendiamin als Reagens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The condensation of dehydroascorbic acid with o-phenylene diamine or its 4,5-dimethyl derivative yields quinoxaline derivatives which can be measured by photometry. Ascorbic acid can be determined after preliminary oxidation with mercury(II) chloride in the same way. This highly specific method has been employed for determinations in pharmaceutical formulations (coefficient of variation ± 1–1.5%).
    Notes: Zusammenfassung Die Kondensation von Dehydroascorbinsäure mit o-Phenylendiamin oder 4,5-Dimethyl-o-phenylendiamin führt zur Bildung von spektrophotometrisch auswertbaren Chinoxalinderivaten. Ascorbinsäure kann nach vorangehender Oxidation mit Quecksilberchlorid auf die gleiche Weise bestimmt werden. Die Methode wurde zu Bestimmungen in pharmazeutischen Präparaten verwendet (Variationskoeffizient ± 1–1,5%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423802
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Rapid extraction and direct spectrophotometric determination of iron(III) with thiothenoyltrifluoroacetone (1947)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 348-348 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Eisen(III) ; Spektralphotometrie ; Extraktion mit Thiothenoyltrifluoraceton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423808
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Synergetic extraction and spectrophotometric determination of iron(III) in steel (1947)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 349-349 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Eisen(III) in Stahl ; Spektralphotometrie ; Extraktion mit Acetylaceton und Pyridin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423809
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Extraction of cobalt with ethyl acetate and simultaneous photometric determination of cobalt and nickel (1947)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1947), S. 351-351 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kobalt neben Nickel ; Spektralphotometrie ; Extraktion mit Äthylacetat als Xanthate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423811
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    Paper (German National Licenses)
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