Search Results - (Author, Cooperation:Kürten)

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  1. 1
    Kuerten, J. G. M.

    [S.l.] : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We propose new identities for dynamic subgrid modeling in large-eddy simulation involving an explicit filter and its inverse. Exact defiltering of a class of numerical realizations of the top-hat filter is developed. The approach is applied to large-eddy simulation of the temporal mixing layer. Smagorinsky's model is adopted as base model and the results are compared to the standard dynamic eddy-viscosity model as well as to filtered DNS (direct numerical simulation) results. The difference between the results of the two models for the present application is found to be quite small. This is explained by performing a sensitivity analysis with respect to the dynamic coefficient, which hints towards a "self-restoring" response underlying the observed robustness of the physical predictions. Using DNS data the validity of the assumption that the model coefficients are independent of filter width is tested and found to favor the inverse modeling procedure. The computational effort of the dynamic inverse model is 15% smaller than of the standard dynamic eddy-viscosity model. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.870238

    Articles: DFG German National Licenses
  2. 2
    Vreman, Bert ; Kuerten, Hans ; Geurts, Bernard

    [S.l.] : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The occurrence of shocks in the confined three-dimensional turbulent mixing layer at convective Mach number 1.2 is established by means of direct numerical simulations. The shocks are generated by the turbulent motions in the flow. Consequently, they can have different shapes and orientations, while they persist for a relatively short time. Furthermore, they are created by different types of turbulent vortices. The shocks do not strongly contribute to the turbulent dissipation. Even at the time when the largest shocks occur, the fraction of the turbulent dissipation due to the shocks is less than 10%. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.868460

    Articles: DFG German National Licenses
  3. 3
    Vreman, Bert ; Geurts, Bernard ; Kuerten, Hans

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The dynamic mixed subgrid-scale model of Zang et al. [Phys. Fluids A 5, 3186 (1993)] (DMM1) is modified with respect to the incorporation of the similarity model in order to remove a mathematical inconsistency. Compared to DMM1, the magnitude of the dynamic model coefficient of the modified model (DMM2) is increased considerably, while it is still significantly smaller than as occurs in the dynamic subgrid-scale eddy-viscosity model of Germano [J. Fluid Mech. 238, 325 (1992)] (DSM). Large eddy simulations (LES) for the weakly compressible mixing layer are conducted using these three models and results are compared with direct numerical simulation (DNS) data. LES based on DMM1 gives a significant improvement over LES using DSM, while even better agreement is achieved with DMM2. © 1994 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.868333

    Articles: DFG German National Licenses
  4. 4
    de Waele, A.T.A.M. ; Kuerten, J.G.M.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4526
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4526(89)90049-5

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    0009-2614
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0009-2614(84)85043-5

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    0378-4363
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0378-4363(85)90103-2

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01751380

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01767197

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01750816

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01750825

    Articles: DFG German National Licenses
  11. 11
    Ruiz-Torres, A. ; Burmeister, H. ; Kürten, I.
    Springer
    Published 1975
    Staff View
    ISSN:
    1436-6215
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Medicine
    Description / Table of Contents:
    Summary The law protein nutrition of the nursing rat inhibits the growth of the new born rats. A percentage reduction of the dry substance by decrease of N2-free substances takes place. In relation to g dry substance the body protein content, collagen also, rises. Absolutely, these parts rest unaltered, just so the relation of the parenchymatous protein to collagen. The often support of view that starving provokes a collagen formation of the body, that means an exceed of the framework, can not be confirmed. Though in this paper we can give an explanation for the occurrence of this conclusion. Long interruptions of lactation periods remarkably have no effect on the growth and on the main compartments of the body of new born rats. Only tryptophane is reduced in favour of the serine-fraction in the body of those animals. We discuss this finding as a change of the metabolisme of tryptophane depending of stress.
    Notes:
    Zusammenfassung Die eiweißarme Ernährung der stillenden Rattenmutter hemmt das Wachstum des neugeborenen Wurfes. Dabei tritt eine prozentuale Reduktion der Trockensubstanz durch Verminderung von N2-freien Stoffen auf, so daß sowohl parenchymatöses als auch kollagenes Eiweiß im Trockenanteil des Körpers dieser Tiere gegenüber den Kontrollen überwiegt. Absolut gesehen bleiben aber diese Fraktionen unverändert bestehen; auch ist die Relation Parenchymeiweiß zu Kollagen — gemessen am Aminosäurenspektrum — konstant. Die oft vertretene Auffassung, daß das Hungern eine „Kollagenisierung“ des Körpers, also das Überwiegen des Gerüstanteiles, bedingt, wird nicht bestätigt, obgleich hier eine Erklärung für das Zustandekommen dieser Schlußfolgerung gegeben wird. Lange Unterbrechungen der Stillperioden rufen bemerkenswerterweise keine Auswirkungen auf das Wachstum und auf die Körperhauptkompartiments der neugeborenen Ratten hervor. Lediglich vermindert sich der Tryptophan- zugunsten des Serinanteiles im Körper dieser Tiere. Dieser Befund wird als belastungsbedingte Änderung im Tryptophanstoffwechsel diskutiert.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02021203

    Articles: DFG German National Licenses
  12. 12
    Grundmann, R. ; Strümper, R. ; Kürten, K. ; Pichlmaier, H.
    Springer
    Published 1977
    Staff View
    ISSN:
    1435-2451
    Keywords:
    Hepatic surgery ; Blood loB ; Hemodilution ; Leberchirurgie ; Blutverlust ; Hiimodilution
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Description / Table of Contents:
    ZusammenfaBung Die Möglichkeiten der Blutersparnis bei Leberresektion werden dargestellt: die anatomiegerechte Lappenresektion—die Resektion mit ein oder zwei Klemmen - unter Hypothermie und Abklemmen der Leberpforte — am blutleer gespülten isolierten Organ - unter Einsetzen des internen Cava-Shunt - unter Verwendung der Autotransfusionspumpe. In einem eigenen Krankengut von 15 Leberresektionen wurde bei 6 Patienten eine weitere Methode der Blutersparnis mit Erfolg eingesetzt: die akute präoperative Hämodilution. GerinnungBtörungen wurden dabei nicht beobachtet.
    Notes:
    Summary Methods to reduce blood loB in hepatic surgery are decribed! 1) the control method of hepatic lobectomy, 2) resection using one or two clamps, 3) resection under hypothermia with simultaneous clamping of the liver hilus, 4) resection of the isolated bloodleB organ under hypothermia, 5) use of an internal cava shunt, 6) use of intraoperative autotransfusion. In 6 of 15 patients treated by liver resection, a further method to reduce blood loB was used: acute preoperative hemodilution. Blood clotting was not impaired postoperatively.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01305665

    Articles: DFG German National Licenses
  13. 13
    Ruiz-Torres, A. ; Kürten, I.
    Springer
    Published 1976
    Staff View
    ISSN:
    1420-9071
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Medicine
    Notes:
    Summary Rats can produce glycine from hydroxyproline and vice versa. After the injection, hydroxyproline is rapidly converted into glycine and then incorporated into collagen. Later the labelled amino acids in collagen are hydroxyproline, proline, serine, threonine, alanine, and glutamic acid. We suppose that all these labelled amino acids come from glycine.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01990157

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01756252

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01756254

    Articles: DFG German National Licenses
  16. 16
    Mayser ; Weninger, Josef ; Ganter ; Ronnefeldt ; Spiecker ; Günther ; Kürten ; Franz ; Martini
    Springer
    Published 1940
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01781185

    Articles: DFG German National Licenses
  17. 17
    Gaase ; Ronnefeldt ; Zech ; Kürten ; Jacob ; Matzdorff
    Springer
    Published 1941
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01750951

    Articles: DFG German National Licenses
  18. 18
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01760433

    Articles: DFG German National Licenses
  19. 19
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01767050

    Articles: DFG German National Licenses
  20. 20
    Staff View
    ISSN:
    1437-1596
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Law
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01754647

    Articles: DFG German National Licenses