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  • Chemistry  (5)
  • Engineering  (1)
  • Key words Finite elements, statistical equivalent linearization, component-mode synthesis, complex modal analysis, random eigenvalue problem, hysteresis, damping  (1)
  • Lactobacillus delbrueckii subsp. lactis  (1)
  • 1995-1999  (4)
  • 1965-1969  (4)
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Keywords
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Years
Year
  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Cloning and DNA sequence analysis of pepQ, a prolidase gene from Lactobacillus delbrueckii subsp. lactis DSM7290 and partial characterization of its product (1995)
    Springer
    Molecular genetics and genomics 247 (1995), S. 494-500 
    Details
    ISSN: 1617-4623
    Keywords: Prolidase ; Metalloprotease ; Lactobacillus delbrueckii subsp. lactis ; Nucleotide sequence analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From a genomic library of Lactobacillus delbrueckii subsp. lactis (DSM7290) DNA, in the low-copy-number vector pLG339, a recombinant clone was selected, which complemented a mutation in the prolidase gene (pepQ) of Escherichia coli UK173. Nucleotide sequence analysis revealed an open reading frame of 1104 nucleotides corresponding to a protein of 368 amino acids with a calculated pI of 4.64 and a molecular mass of 41087 Da. The start site of pepQ transcription was determined by primer extension analysis with mRNA prepared from L. delbrueckii. Based on homology of the gene product to various peptidases and on the substrate specificity determined, the peptidase was designated PepQ. The influence of various protease inhibitors and cations on peptidase activity indicated that PepQ is a metalloprotease. The absence of a membrane-spanning domain and a signal peptide sequence argues for a cytoplasmic localization of the enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293152
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  • 3
    Electronic Resource
    Electronic Resource
    Fabrication of glassy carbon microstructures by pyrolysis of microfabricated polymeric precursorsThis work has been supported in part by the Office of Naval Research and the Defense Advanced Research Projects Agency. It used MRSEC Shared Facilities supported by the National Science Foundation (DMR-9400396). The authors thank Xiao-Mei Zhao for demonstrating microtransfer molding. (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 477-480 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970090604
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen über das elektrolytisch-potentiostatische Ätzen von nichtrostenden Stählen in 10 n NaOH unter Anwendung eines Coulometers (1969)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 183-194 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigations into the electrolytic-potentiostatic etching of stainless steels in 10 n NaOH, using a coulometerCurrent density/potential characteristics can only provide qualitative indications concerning the phenomena encountered with potentiostatic etching in 10 n NaOH. The process is best carried out in the trans-passive zone. Identification is based, not on the selective dissolution of certain standard components, but on the interference colours which can be observed as a result of the formation of cover layers of different thickness. The charge density/time characteristics also permit quantitative indications of the different phases. Current density/time curves permit a clarification of the mechanism govering the formation of cover layers. A ferritic steel (28 pC Cr) and a NiCr alloy (45 pC Cr) were found to follow a cubic law of growth, whilst CrNi steel 18-8 is initially governed by an approximately logarithmic law, followed by a zone extending over several hours where the growth begins to follow a parabolic law.
    Notes: Stromdichte-Potential-Kurven ermöglichen nur qualitative Aussagen über die Vorgänge beim potentiostatischen Ätzen in 10 n NaOH. Am günstigsten ist Ätzen im Transpassivbereich. Die Identifizierung erfolgt dabei nicht durch selektive Auflösung bestimmter Gefügebestandteile, sondern aufgrund der Interferenzfarben, die infolge der Bildung unterschiedlich starker Deckschichten zu beobachten sind. Die Ladungsdichte-Zeit-Kurven ermöglichen auch Aussagen über die Mengen der einzelnen Phasen. Stromdichte-Zeit-Kurven ermöglichen eine Aufklärung des Deckschichtbildungsmechanismus. Für einen ferritischen Stahl (28% Cr) und eine NiCr-Legierung mit 45% Cr gilt ein kubisches Wachstumsgesetz, während für CrNi-Stahl 18-8 zunächst ein annähernd logarithmisches Gesetz gilt, an das sich ein mehrstündiger Bereich anschließt, in dem übergang zu einem parabolischen Schichtwachstum erfolgt.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19690200302
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Existenz niedergliedriger Cycloalkine, X Bildung und Verhalten von Cycloheptin Kollegen B. Eistert zum 65. Geburtstag in freundschaftlicher Verbundenheit (1968)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 711 (1968), S. 65-75 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei Umsetzungen von 1.2-Dibrom-cyclohepten (1) mit Magnesium bzw. Alkaliamalgamen erhielt man neben Trispentamethylenbenol (2) ein Hexameres des Cycloheptins (3a), das sich durch leichte Umlagerung zu einem höher schmelzenden Isomeren 3b auszeichnete. Für die beiden Kohlenwasserstoffe werden die Strukturen A oder B vorgeschlagen. Das Hexamere 3a ließ sich auch durch Bleitetraacetat-Oxydation des Aminotriazols 6 darstellen, wenn man mit Pyridin die Addition der bei der Reaktion freiwerdenden Essigsaure an die Dreifach-bindung verhinderte. Außerdem ermöglichte die Bleitetraacetat-Oxydation Aussagen über die Lebensdauer des Cycloheptins: In verdünnter Lösung ist es mehrere Stunden haltbar und übertrifft damit die Beständigkeit des Sechsringhomologen bei weitem.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19687110110
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Existenz niedergliedriger Cycloalkine, IX Über das intermediäre Auftreten von Cyclooctadien-(1.2) (1968)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 711 (1968), S. 55-64 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung von Cyclononin und Cyclononadien-(1.2) mit 1.3-Diphenyl-benzo[c]furan wurden die korrespondierenden Cycloalkin- bzw. Cycloallen-Diphenyliso-benzofuran-Addukte hergestellt und durch ihre NMR-Spektren charakterisiert. Ein Vergleich mit den Addukten der niedergliedrigen Cycloalkine bestätigte, daß diese Substanzen tatsächlich Cycloalkin-Abfangprodukte darstellen. Bei Versuchen, Cyclooctadien-(1.2) intermediär freizusetzen und mit Diphenylisobenzofuran abzufangen, entstand das Addukt 2, das jedoch nur mit Vorbehalt als Cycloallen-Abfangprodukt aufgefaßt werden kann. Bei Wiederholung dieser Versuche in Abwesenheit eines Abfangmittels wurde das Cyclobutan-Derivat 5 nachgewiesen, das, als Folgeprodukt des Cyclooctadiens-(1.2) betrachtet, dessen Auftreten sehr wahrscheinlich macht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19687110109
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Existenz niedergliedriger Cycloalkine, XI Zum intermediären Auftreten von Cycloheptadien-(1.2) (1968)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 711 (1968), S. 76-81 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Behandeln von 1-Brom-cyclohepten (1) mit Kalium-tert.-butanolat in Gegenwart von 1.3-Diphenyl-benzo[c]furan wurde das zugehörige Cycloheptadien-Addukt 2 erhalten, das jedoch den Schluß auf intermediär erzeugtes Cycloallen nur mit Vorbehalt zuließ, da es sich auch durch basenkatalysierte Umlagerung aus dem Cycloheptin-Addukt 3 bilden kann. Bei einer analogen Reaktion mit 1.2-Dibrom-cyclohepten ließ sich hingegen eine Allen-Zwischenstufe mit Sicherheit nachweisen. Auch die Umsetzung von 1 ohne Abfangmittel, die zu zwei tricyclischen Kohlenwasserstoffen C14H20 führte, spricht für die Existenz des Cycloheptadiens-(1.2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19687110111
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  • 8
    Electronic Resource
    Electronic Resource
    ADAPTIVE PARALLEL MULTIGRID SOLUTION OF 2D INCOMPRESSIBLE NAVIER-STOKES EQUATIONS (1997)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 24 (1997), S. 875-892 
    Details
    ISSN: 0271-2091
    Keywords: adaptive parallel multigrid method ; local refinement criteria ; incompressible Navier-Stokes equations ; hole pressure problem ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper an adaptive parallel multigrid method and an application example for the 2D incompressible Navier-Stokes equations are described. The strategy of the adaptivity in the sense of local grid refinement in the multigrid context is the multilevel adaptive technique (MLAT) suggested by Brandt. The parallelization of this method on scalable parallel systems is based on the portable communication library CLIC and the message-passing standards: PARMACS, PVM and MPI. The specific problem considered in this work is a two-dimensional hole pressure problem in which a Poiseuille channel flow is disturbed by a cavity on one side of the channel. Near geometric singularities a very fine grid is needed for obtaining an accurate solution of the pressure value. Two important issues of the efficiency of adaptive parallel multigrid algorithms, namely the data redistribution strategy and the refinement criterion, are discussed here. For approximate dynamic load balancing, new data in the adaptive steps are redistributed into distributed memories in different processors of the parallel system by block remapping. Among several refinement criteria tested in this work, the most suitable one for the specific problem is that based on finite-element residuals from the point of view of self-adaptivity and computational efficiency, since it is a kind of error indicator and can stop refinement algorithms in a natural way for a given tolerance. Comparisons between different global grids without and with local refinement have shown the advantages of the self-adaptive technique, as this can save computer memory and speed up the computing time several times without impairing the numerical accuracy. © 1997 By John Wiley & Sons, Ltd. Int. J. Numer. Methods Fluids 24, 875-892, 1997.
    Additional Material: 13 Ill.
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