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  • 1
    Electronic Resource
    Electronic Resource
    A closed form solution for the response of a long elastic beam to dynamic loading (1989)
    Springer
    Archive of applied mechanics 60 (1989), S. 41-50 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Mit Hilfe von Fourier-Transformationen werden geschlossene Lösungen für die Durchbiegung, die Krümmung und die Geschwindigkeit der Punkte auf der Achse langer Balken, die durch eine zeitabhängige vertikale Einzelkraft belastet werden, erhalten. Die Lösungen werden anhand eines halben Sinusstoßes und eines Rechteckstoßes illustriert. Die Durchbiegung, Krümmung und Geschwindigkeit werden in dimensionsloser Form als Funktionen der dimensionslosen Längskoordinate und Zeit dargestellt. Darüber hinaus wird der Sonderfall konstanter Stoßgeschwindigkeit, der von anderen Autoren mit anderen Methoden untersucht wurde, betrachtet: Abgesehen von Abweichungen durch die numerische Lösung auftretender Integrale stimmen die Ergebnisse überein.
    Notes: Summary Closed form solutions have been obtained using Fourier transform method for the deflection, curvature and particle velocity of a long elastic beam when it is subjected to a concentrated transverse force which is varying with time. These solutions have been illustrated with the help of two force histories, i.e. a half-sine pulse and a rectangular pulse. Dimensionless parameters representing deflection, curvature and particle velocity have been plotted as functions of dimensionless distance and dimensionless time. Furthermore, the particular case of constant velocity impact which has been studied by other authors using different techniques has also been considered in the present paper and the results compare within numerical errors involved in the evaluation of integrals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538407
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  • 2
    Electronic Resource
    Electronic Resource
    The strength of the fibre-polymer interface in short glass fibre-reinforced polypropylene (1982)
    Springer
    Journal of materials science 17 (1982), S. 3179-3188 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method for the determination of the interfacial bond strength in well-aligned short glass fibre-reinforced polypropylene samples is discussed. The method takes into account the variation of the interfacial shear stress during the deformation process; consequently, it yields very consistent results at all values of the composite strain. The influence of the fibre orientation with respect to the load axis is appropriately considered using macro-mechanical analyses for stiffness and strength of the composite. The method is compared with two other methods reported in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203481
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of fibre orientation on the interfacial shear stress in short fibre-reinforced polypropylene (1987)
    Springer
    Journal of materials science 22 (1987), S. 1949-1955 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two methods for the determination of interfacial shear stress and the orientation effects in well aligned short fibre-reinforced polypropylene specimens subjected to uniaxial tension have been discussed. Both methods are based on the stress-transfer model due to Kelly and Tyson, but the orientation effects are taken into account by different procedures. In the first procedure the stress and strain along the load axis are considered and the orientation factor is found to be close to cos4θ for θ ⩽ 45°. In the second procedure the fibre orientation is taken into account by resolving stress and strain in the fibre axis direction. The transverse strain is also considered with the help of experimentally determined values of Poisson's ratio. The second procedure was found to be very satisfactory and it also confirms the assumption of linear dependence of interfacial stress on the tensile stress in the fibre direction, as postulated in an earlier study, for all orientations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132922
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation of some phenolic compounds by vanadium (V) (1965)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 209 (1965), S. 337-340 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Oxydation mehrerer phenolischer Verbindungen mit Vanadat wurde unter verschiedenen Bedingungen untersucht. Dabei konnten keine Unterschiede im Reaktionsverlauf festgestellt werden. Je nach dem Verbrauch an OxydationslÖsung wurden die Reaktionsgleichungen formuliert. Die Oxydationsprodukte wurden im Reaktionsgemisch qualitativ nachgewiesen.
    Notes: Summary The oxidation of a number of phenolic compounds with vanadate solution was investigated under varying conditions, but no change in the reaction could be observed. The probable reactions were postulated according to the consumption of vanadate solution. The oxidation products were qualitatively detected in the reaction mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00521553
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  • 5
    Electronic Resource
    Electronic Resource
    Estimation of vanadium in different oxidation states (1965)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 209 (1965), S. 405-409 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die verschiedenen Wertigkeitsstufen des Vanadiums wurden volumetrisch in Mischungen bestimmt. Zur Endpunktanzeige dienten visuelle Indicatoren.
    Notes: Summary In the present investigations, the different oxidation states of vanadium have been estimated volumetrically in mixtures with the help of visual indicators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00520599
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  • 6
    Electronic Resource
    Electronic Resource
    Isoenzymic diversity index of vigna parents in relation to heterosis for seed yield in green gram (Vigna radiata (L.)Wilczek) (1987)
    Springer
    Euphytica 36 (1987), S. 61-68 
    Details
    ISSN: 1573-5060
    Keywords: Vigna radiata ; green gram ; isoenzyme ; enzyme activity ; protein ; heterosis for seed yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Extent of heterosis for seed yield is an indicator for transgressive segregation in cross of self-pollinated crops. However, the extent of heterosis is thought to be related to the genetic diversity among the parents. Isoenzymic variation was used for estimating the genetic diversity. Eight varieties of green gram (Vigna radiata) were characterized for esterase, amylases, phosphatases, catalase and peroxidase isoenzymes. Differences in these systems were used to calculate a diversity index (D.I.). Hybrids produced from an inbred pair having higher D.I.'s outyielded those with low D.I.'s. However, the correlation (r) between D.I. and heterosis for seed yield was not consistent in different seasons but some of the desirable crosses could be singled out on the basis of D.I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730648
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  • 7
    Electronic Resource
    Electronic Resource
    Titrations with hypovanadous salts (1962)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 189 (1962), S. 330-336 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Einstellung von Vanadium(II)-lösungen mit Eisen(III)- oder Kupfer(II)-salzen werden als visuelle Indicatoren Neutralrot, Phenosafranin, Methylenblau oder Gallocyanin benutzt. Bei Zugabe von Eisen(III)-lösung zur Vanadium(II)-lösung zeigt Neutralrot den Übergang VII → VIII an. Dieser Übergang wird ebenfalls von Neutralrot und Phenosafranin angezeigt, wenn Vanadium(II)-lösung in Gegenwart von überschüssiger konz. Salzsäure bei erhöhter Temperatur zu Eisen(III)- oder Kupfer(II)-lösung gegeben wird. Der Übergang VII → VIV wird von Methylenblau oder Gallocyanin angezeigt, wenn Eisen(III)-lösung bei erhöhter Temperatur mit Vanadium(II)-lösung titriert wird. Die Titration eines Gemisches von Eisen(III) und Kupfer(II) wird ebenfalls ausgeführt.
    Notes: Summary In the present investigations, the standardization of vanadium(II) solution against ferric and cupric salts has been described and a few visual indicators have been shown to be applicable in the above titrations. When iron(III) solution is added to vanadium(II) solution neutral red marks the end point for VII to VIII change. This change is also noted when vanadium(II) solution is added to ferric solution in the presence of excess of concentrated hydrochloric acid at an elevated temperature and neutral red and phenosafranine as visual indicators. Under the same conditions, the end point with eupric solution also corresponds to this change. When vanadium(II) solution is added to ferric solution at an elevated temperature in the presence of methylene blue or gallocyanine as visual indicators, the end point marks VII to VIV change. A mixture of iron and copper has also been titrated successfully with the help of visual indicators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00495448
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  • 8
    Electronic Resource
    Electronic Resource
    Titrations with hypovanadous salts (1962)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 189 (1962), S. 406-411 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe von Vanadium(II)-Sulfatlösung können Uran(VI), Zinn(II), Chlorat, Bromat, Persulphat, Perborat sowie Peroxid mit gutem Erfolg titriert werden. Die Erkennung des Endpunkts erfolgt durch visuelle Indikation.
    Notes: Summary Estimations of uranyl acetate, stannous chloride, potassium chlorate, bromate, and a number of oxidising agents (persulphate, perborate, sodium peroxide, and hydrogen peroxide) can be carried out with the help of vanadium(II) sulphate using visual end point indication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00497694
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  • 9
    Electronic Resource
    Electronic Resource
    Colorimetric studies of vanadium(V) with organic acids (1963)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 196 (1963), S. 92-95 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die intensive Gelbfärbung, die Ammoniummetavanadat mit organischen Säuren (Essig-, Bernstein-, Malon-, Benzoe-, Phthalsäure) bildet, kann zu einer colorimetrischen Vanadiumbestimmung benutzt werden. Andererseits kann die Schwächung der aus Metavanadat und Essigsäure gebildeten Gelbfärbung durch Oxal- und Citronensäure zu einer indirekten colorimetrischen Bestimmung dieser Säuren herangezogen werden.
    Notes: Summary The intense yellow colour developed by adding an excess of organic acids (acetic, succinic, malonic, benzoic, phthalic) to an ammonium metavanadate solution is employed for the colorimetric determination of vanadium. On the other hand, the decrease in the intensity of the colour developed by acetic acid and metavanadate by oxalic and citric acids can be used for an indirect colorimetric determination of these acids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00483063
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  • 10
    Electronic Resource
    Electronic Resource
    Estimations with hypovanadous salts (1963)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 196 (1963), S. 169-171 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Cu, Hg, Sb, Bi, Se, Te, Au, Pt und Pd können mit Vanadium(II)-sulfatlösung aus ihren Verbindungen in elementarer Form gefällt und gravimetrisch bestimmt werden.
    Notes: Summary It has been shown that Cu, Hg, Sb, Bi, Se, Te, Au, Pt and Pd precipitated from their compounds in elementary form and thus be determined gravimetrically by vanadium(II) sulphate solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636885
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