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  • Artikel  (239)
  • Mathematik  (239)
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  • Artikel  (239)
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  • 1
    Digitale Medien
    Digitale Medien
    Letter to the Editor (2002)
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd
    Teaching statistics 24 (2002), S. 0 
    Details
    ISSN: 1467-9639
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/1467-9639.00100_1
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The multilinear extension and the coalition structure value
    Amsterdam : Elsevier
    Games and Economic Behavior 4 (1992), S. 582-587 
    Details
    ISSN: 0899-8256
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Mathematik , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0899-8256(92)90038-T
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Mathematical modelling of juxtacrine patterning (2000)
    Springer
    Bulletin of mathematical biology 62 (2000), S. 293-320 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract Spatial pattern formation is one of the key issues in developmental biology. Some patterns arising in early development have a very small spatial scale and a natural explanation is that they arise by direct cell—cell signalling in epithelia. This necessitates the use of a spatially discrete model, in contrast to the continuum-based approach of the widely studied Turing and mechanochemical models. In this work, we consider the pattern-forming potential of a model for juxtacrine communication, in which signalling molecules anchored in the cell membrane bind to and activate receptors on the surface of immediately neighbouring cells. The key assumption is that ligand and receptor production are both up-regulated by binding. By linear analysis, we show that conditions for pattern formation are dependent on the feedback functions of the model. We investigate the form of the pattern: specifically, we look at how the range of unstable wavenumbers varies with the parameter regime and find an estimate for the wavenumber associated with the fastest growing mode. A previous juxtacrine model for Delta-Notch signalling studied by Collier et al. (1996, J. Theor. Biol. 183, 429–446) only gives rise to patterning with a length scale of one or two cells, consistent with the fine-grained patterns seen in a number of developmental processes. However, there is evidence of longer range patterns in early development of the fruit fly Drosophila. The analysis we carry out predicts that patterns longer than one or two cell lengths are possible with our positive feedback mechanism, and numerical simulations confirm this. Our work shows that juxtacrine signalling provides a novel and robust mechanism for the generation of spatial patterns.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1006/bulm.1999.0152
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    On the core of linear production games (1975)
    Springer
    Mathematical programming 9 (1975), S. 358-370 
    Details
    ISSN: 1436-4646
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Mathematik
    Notizen: Abstract An economic production game is treated, in which players pool resources to produce finished goods which can be sold at a given market price. The production process is linear, so that the characteristic function can be obtained by solving linear programs. Duality theory of linear programming is used to obtain equilibrium price vectors and to prove the non-emptiness of the core. Under replication, it is shown that, in the non-degenerate case, the core converges finitely to the set of competitive equilibria; a counter-example shows that this is not true in the degenerate case (i.e., only convergence in the limit can be guaranteed).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01681356
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Accelerated Test Models for System Strength Based on Birnbaum-Saunders Distributions (1999)
    Springer
    Lifetime data analysis 5 (1999), S. 133-147 
    Details
    ISSN: 1572-9249
    Schlagwort(e): carbon composite materials ; cumulative damage ; damage models ; Fisher information ; size effect ; strength distributions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract Recent research in cumulative damage models for strengths of systems has yielded various statistical distributions that incorporate a system size variable and follow a generalized Birnbaum-Saunders form. These models can be unified as a three-parameter Birnbaum-Saunders-type family of distributions, where the third parameter arises from the size variable through the cumulative damage approach. In this paper, the generalized three-parameter Birnbaum-Saunders distribution is characterized, and examples of cumulative damage models for system strength that fit this form are given. Also, estimation and asymptotic theory are developed for the generalized distribution, and illustrations are presented for experimental strength data for carbon composite materials.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009649428243
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Market economies with many commodities (1996)
    Springer
    Decisions in economics and finance 19 (1996), S. 113-185 
    Details
    ISSN: 1129-6569
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Beschreibung / Inhaltsverzeichnis: Riassunto In questo lavoro si discutono i problemi che si presentano quando, in connessione all'esistenza e all'efficienza di equilibri Walrasiani nel modello di Arrow-Debreu-McKenzie, si ammette che lo spazio dei beni sia di dimensione non finita. È diventato chiaro nei due ultimi decenni che per affrontare questioni reali è necessario usare modelli sia dinamici che stocastici e ciò conduce in modo naturale alla considerazione di spazi infinito-dimensionali. Si rimane principalmente confinati alle economie di puro scambio al solo scopo di semplificare la trattazione.
    Notizen: Abstract In this survey problems from the consideration of infinite dimensional commodity spaces in the Arrow-Debreu-McKenzie model are discussed. It has become clear in the last couple of decades that in order to address real policy questions, economic models that are both stochastic and dynamic have to be employed. These models lead naturally to infinite dimensional commodity spaces.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02441265
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    On the possibility of detecting invariance of material response to changes in time scale (1975)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 26 (1975), S. 605-610 
    Details
    ISSN: 1420-9039
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Stoffe werden betrachtet, deren Verhalten in einer gegebenen Bewegung invariant bezüglich gewisser zeitlicher Masstabwechsel ist. Bedingungen für die Bewegung werden angegeben, mit deren Hilfe die Invarianz folgendermassen feststellbar ist: man betrachtet Bewegungen mit gegebenem Anfangszustand, die sich von der ursprünglichen Bewegung nur in zeitlichen Masstabwechseln unterscheiden, und man misst das Verhalten des Materials. Es wird bewiesen, dass dieses Versuchsverfahren nur dann durchführbar ist, wenn die gegebene Bewegung beschleunigungsfrei oder zirkulationserhaltend ist; diese Bedingung ist bei einfachen, inkompressiblen Stoffen nicht zu einschränkend.
    Notizen: Abstract Our attention is focused here on a class of materials each of whose response to a particular motion is invariant under certain changes in time scale. We establish conditions on the given motion under which this invariance can in principle be detected by means of the following procedure: subject identical specimens to motions which differ from the given one only by the appropriate changes in time scale and measure the responses. In general, the class of motions for which this procedure is feasible includes only certain accelerationless or circulation-preserving motions. However, for the special case of simples, incompressible materials in homogeneous bodies this restriction is not unduly severe.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01594032
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Laminar natural convection boundary layers on horizontal surfaces possessing a circular cut-out (1992)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 43 (1992), S. 553-566 
    Details
    ISSN: 1420-9039
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Summary A first-order boundary-layer analysis, including variable properties effects, is given for laminar natural convection on a horizontal surface possessing a circular cut-out. The latter provides the leading edge of the boundary layer and it is shown that, initially, boundary layer development occurs as if the leading edge were straight. Far from the cut-out, boundary layer development is shown to become completely axially symmetric.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00946246
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    A new proof of Nakano's theorem in locally solid Riesz spaces (1975)
    Springer
    Mathematische Zeitschrift 144 (1975), S. 25-33 
    Details
    ISSN: 1432-1823
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01214405
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Positive compact operators on Banach lattices (1980)
    Springer
    Mathematische Zeitschrift 174 (1980), S. 289-298 
    Details
    ISSN: 1432-1823
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01161416
    Standort Signatur Erwartet Verfügbarkeit
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