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  • Springer  (96)
  • PANGAEA  (33)
  • Wiley-Blackwell  (22)
  • EMBO Press  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Elastic scattering of α-particles on10B forE α = 5−50 MeV (1976)
    Springer
    The European physical journal 279 (1976), S. 163-168 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental data of the elastic scattering ofα-particles on10B forE α = 30−50.6 MeV are presented. They are analysed together with the data of a previous measurement forE α = 5−30 MeV in the frame of the optical model including spin-orbit coupling. The interaction radii of theα-10B-systems are determined with the Inopin-Ericson model forE α = 5−50 MeV. The mean free path ofα-particles in10B is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437873
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of spatial correlation of concrete strength on the failure probabilities of reinforced concrete chinneys (1989)
    Springer
    Materials and structures 22 (1989), S. 255-263 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A procedure to estimate the failure probabilities of reinforced concrete (R/C) chimneys under severe wind loading which allows for considering realistic correlation values of concrete strength is developed. The results show that the assumption of full correlation of concrete strength within cross-sections, as suggested for example in present codes, may significantly overestimate the failure rates in present examples by two orders of magnitude. However, it is also shown that not only one but a number of cross-sections may contribute to the total failure rate of R/C chimneys. As a consequence, the failure estimates increase, in some cases by as much as two orders of magnitude. In the numerical examples as investigated here these counteracting effects neutralize each other. This fact, however, should not be generalized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472557
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  • 3
    Electronic Resource
    Electronic Resource
    On the stochastic response of nonlinear FE models (1999)
    Springer
    Archive of applied mechanics 69 (1999), S. 765-784 
    Details
    ISSN: 1432-0681
    Keywords: Key words Finite elements, statistical equivalent linearization, component-mode synthesis, complex modal analysis, random eigenvalue problem, hysteresis, damping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary This paper focuses on the stochastic dynamic response of structures modeled by finite elements with a relatively large number of degrees of freedom. FE models with nonlinearities and uncertain (stochastic) system properties are discussed. It is shown that component mode synthesis can be used most advantageously to solve the issue of computational efficiency and feasibility. The stochastic response due to stochastic loading of large FE models with nonlinear elements is determined by statistical equivalent linearization (EQL). The developed component-mode synthesis allows to determine the complex modal properties of arbitrary large linearized finite element models. Nonsymmetric structural matrices, as a result of the EQL, and filters for modeling of filtered white noise can be treated by the suggested approach. Since the efficiency of the procedure is nearly independent of the number of degrees-of-freedom (DOF) involved, statistical equivalent linearization becomes applicable for arbitrary detailed FE models. Furthermore, the dynamic response of FE models with uncertain or stochastic system properties is discussed. In this case, Monte Carlo simulation is suggested as the most appropriate approach for FE models. The paper focuses on the random eigenvalue problem for large FE systems as the computationally most demanding part of the dynamic analysis. Component-mode synthesis is used to provide in an efficient manner all the eigenvalue solutions of the FE system needed by the Monte Carlo simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050255
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  • 4
    Electronic Resource
    Electronic Resource
    Zur petrologischen und tektonischen Analyse des Fichtelgebirges (1936)
    Springer
    International journal of earth sciences 27 (1936), S. 260-275 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Zusammenfassung Es wird über auffällige petrographische und tektonische Erscheinungen an den Gneisen des Fichtelgebirges berichtet. Die Gneise haben hier alle eine epizonale Dislokationsmetamorphose erfahren, wie sie in den Mylonitgneisen von Goldkronach heute vorliegt. Die epizonale Fazies wurde in den Wunsiedeler „Kerngneisen“ in der Kontakthaube des variscischen Granites katazonal (bis mesozonal) umgeprägt. Eine großartige, an alpine Beispiele erinnernde Tektonik wird durch Gesteinsverknetungen sichtbar. Eine jüngere, 35 km lange Blattverschiebung wird an der gleichsinnigen Verlagerung von Münchberger Gneis (Bernecker Gneiskeil), Paläozoikum, der Achsen der Magmatite und von drei Marmorzügen nachgewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01804991
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  • 5
    Electronic Resource
    Electronic Resource
    Überlegungen bei der Wahl der Methode zur Analyse von Spurenstoffen (1966)
    Springer
    Microchimica acta 54 (1966), S. 742-750 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary In the determination of materials that are present in very small amounts, it is necessary above all to learn the error of the individual steps of the analysis. The greatest partial error governs the total error of the procedure and usually is due to the inhomogeneity of the material being examined. Only with knowledge of the total error can a decision be reached as to whether the analysis has informational worth, and what apparatus is necessary. The concepts: error, precision, and accuracy are defined and the problem is made clear on the basis of several examples.
    Abstract: Résumé Dans le cas de l'analyse de substances se trouvant en très petites quantités, il est indispensable, en première ligne, d'établir l'erreur intervenant dans chaque étape de l'analyse. L'erreur partielle la plus grande l'emporte sur l'erreur totale du procédé. Elle est due, la plupart du temps, au manque d'homogénéité dû corps étudié. Les notions d'erreur, de précision et d'exactitude se trouvent définies et le problème est rendu explicite à l'aide d'exemples.
    Notes: Zusammenfassung Bei der Analyse von Stoffen, die in sehr geringen Gehalten vorliegen, ist es in erster Linie notwendig, die Fehler der einzelnen Analysenschritte festzustellen. Der größte Teilfehler beherrscht den Gesamtfehler des Verfahrens und ist meist in der Inhomogenität des zu untersuchenden Materials begründet. Erst bei Kenntnis des Gesamtfehlers kann entschieden werden, ob der Analyse Aussagekraft zukommt und welche Apparate notwendig sind. Die Begriffe Fehler, Genauigkeit und Richtigkeit werden definiert und das Problem an Hand einiger Beispiele deutlich gemacht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01222998
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Bestimmung der Spurenelemente in der Agrikulturchemie (1956)
    Springer
    Microchimica acta 44 (1956), S. 393-400 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method is described for determining the trace elements in soils, plants, feeds, and fertilizers. The trace elements are separated from the major constituents and concentrated by shaking with complex-forming compounds, after destroying the organic material, the concentrate obtained is dissolved in acid. These solutions are brought continuously on a disk of spectrum carbon and simultaneously spectrographed in sparks. The evaluation is made by comparison with solutions of known content in the usual manner.
    Abstract: Résumé Description d'une méthode de dosage des oligoéléments dans les sols, les plantes, la nourriture et les engrais. Les éléments sont séparés de la matière à analyser, concentrés par agitation avec des substances complexantes. Après destruction de la matière organique les concentrés obtenus sont dissouts dans un acide. Ces solutions sont amenées de façon continue sur un disque en carbone pur et analysées par spectrographie d'étincelles. La détermination se fait par comparaison avec des solutions étalons suivant la méthode classique.
    Notes: Zusammenfassung Es wird eine Methode zur Bestimmung der Spurenelemente in Böden, Pflanzen, Futter- und Düngemitteln beschrieben. Die Spurenelemente werden von den Hauptbestandteilen getrennt, durch Ausschüttelung mit komplexbildenden Verbindungen angereichert, nach Zerstörung der organischen Substanz die erhaltenen Konzentrate in Säure gelöst. Diese Lösungen werden auf einer Scheibe aus spektralreiner Kohle kontinuierlich aufgebracht und gleichzeitig im Funken spektrographiert. Die Auswertung erfolgt durch Vergleich mit Lösungen bekannten Gehaltes in üblicher Weise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01216624
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  • 7
    Electronic Resource
    Electronic Resource
    Neue Lanthanoidmagnetoplumbite: LaFe11A1019, SmFe4Al8O19 und Eu0,83Fe2Al10O19 (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 1079-1085 
    Details
    ISSN: 1434-4475
    Keywords: Aluminium ; Crystal Structure ; Iron ; Oxygen ; Rare Earth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New compounds of magnetoplumbite structure with rare earth-ions were prepared by solid state reactions and determined by X-ray single crystal work. They crystallize in space group D 6h 4 -P63/mmc withA:a=582.6,c=2283;B:a=563.4,c=2208;C:a=565.8,c=2218 pm. The distribution of Fe and Al to the metal positions were determined and the thermal ellipsoids of the metal positions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808621
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of pollen competitive environment on pollen performance in Mirabilis jalapa (Nyctaginaceae) (1997)
    Springer
    Sexual plant reproduction 10 (1997), S. 101-106 
    Details
    ISSN: 1432-2145
    Keywords: Key words Pollen ; Pollen competition ; Pollen performance ; Microgametophyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We examined the influence of pollen competitive environment on pollen performance in Mirabilis jalapa. We used the number of pollen grains and the number of pollen tubes per pistil as measures of pollen competition. Pollen germination, pollen tube penetration into the style, and pollen tube growth rates were used as measures of pollen performance. All three measures of pollen performance were affected by the competitive environment. Pollen germination was greatest at intermediate pollen load sizes. The percentage of germinated pollen grains that penetrated the stigma and grew into the style decreased with pollen load size. Pollen tube growth rate in the style was greater and more variable with larger numbers of pollen tubes in the style. Controlling for the degree of selection at the stigma indicated that pollen-pollen or pollen-style interactions were the likely causes of increased growth rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050074
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  • 9
    Electronic Resource
    Electronic Resource
    Über einen ungewöhnlichen Saponit von Raschau i. Sa. (1950)
    Springer
    Contributions to mineralogy and petrology 2 (1950), S. 279-290 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01098088
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  • 10
    Electronic Resource
    Electronic Resource
    Ein Plagioklas-Charnockit vom Typus Akoafim und seine Stellung innerhalb der Charnockit-Serie (1949)
    Springer
    Contributions to mineralogy and petrology 1 (1949), S. 573-592 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111676
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