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Sökning: hsv:(NATURVETENSKAP) hsv:(Matematik) hsv:(Matematisk analys)

  • Resultat 2601-2610 av 4630
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2601.
  • Gyllenberg, Mats, et al. (författare)
  • Population models with environmental stochasticity
  • 1994
  • Ingår i: Journal of Mathematical Biology. - 0303-6812 .- 1432-1416. ; 32:2, s. 93-108
  • Tidskriftsartikel (refereegranskat)abstract
    • Two discrete population models, one with stochasticity in the carrying capacity and one with stochasticity in the per capita growth rate, are investigated. Conditions under which the corresponding Markov processes are null recurrent and positively recurrent are derived
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2602.
  • Gyllenberg, Mats, et al. (författare)
  • Quasi-stationary distributions of a stochastic metapopulation model
  • 1994
  • Ingår i: Journal of Mathematical Biology. - 0303-6812 .- 1432-1416. ; 33:1, s. 35-70
  • Tidskriftsartikel (refereegranskat)abstract
    • A stochastic metapopulation model which explicitly considers first order interactions between local populations is constructed. The model takes the spatial arrangement of patches into account and keeps track of which patches are occupied and which are empty. The time-evolution of the meta-population is governed by a Markov chain with finite state space. We give a detailed description of the long term behaviour of the Markov chain. Many interesting biological issues can be addressed using the model. As an especially important example we discuss the so-called core and satellite species hypothesis in the light of the model.
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2603.
  • Gyllenberg, Mats, et al. (författare)
  • Single-species metapopulation dynamics : A structured model
  • 1992
  • Ingår i: Theoretical Population Biology. - 0040-5809 .- 1096-0325. ; 42:1, s. 35-61
  • Tidskriftsartikel (refereegranskat)abstract
    • We describe and analyse a general metapopulation model, which consists of a model of local dynamics within a habitat patch, and balance equations for dispersing individuals and the metapopulation. The model includes the effects of emigration and immigration on local dynamics. We derive the equilibrium population size distribution, which is skewed towards either small or large populations, depending on the relative magnitudes of local and metapopulation time scales. The model predicts a generally positive relationship between the fraction of occupied patches and the average local population size. Such a relationship has been commonly observed in nature. The model allows alternative stable equilibria, not found in models which ignore the effect of dispersal on local dynamics. We discuss the implications of our results for biological invasions and conservation biology
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2604.
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2605.
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2606.
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2607.
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2608.
  • Hagendorf, Christian, et al. (författare)
  • Nearest-Neighbour Correlation Functions for the Supersymmetric XYZ Spin Chain and Painlevé VI
  • 2024
  • Ingår i: Communications in Mathematical Physics. - 0010-3616 .- 1432-0916. ; 405
  • Tidskriftsartikel (refereegranskat)abstract
    • We study nearest-neighbour correlation functions for the ground state of the supersymmetric XYZ spin chain with odd length and periodic boundary conditions. Under a technical assumption related to the Q-operator of the corresponding eight-vertex model, we show that they can be expressed exactly in terms of the Painlevé VI tau functions sn and s¯n introduced by Bazhanov and Mangazeev. Furthermore, we give an interpretation of the correlation functions in terms of the Painlevé VI Hamiltonian.
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2609.
  • Haghbin, Hossein, et al. (författare)
  • Functional singular spectrum analysis
  • 2021
  • Ingår i: Stat. - : Wiley. - 2049-1573. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we develop a new extension of the singular spectrum analysis (SSA) called functional SSA to analyze functional time series. The new methodology is constructed by integrating ideas from functional data analysis and univariate SSA. Specifically, we introduce a trajectory operator in the functional world, which is equivalent to the trajectory matrix in the regular SSA. In the regular SSA, one needs to obtain the singular value decomposition (SVD) of the trajectory matrix to decompose a given time series. Since there is no procedure to extract the functional SVD (fSVD) of the trajectory operator, we introduce a computationally tractable algorithm to obtain the fSVD components. The effectiveness of the proposed approach is illustrated by an interesting example of remote sensing data. Also, we develop an efficient and user‐friendly R package and a shiny web application to allow interactive exploration of the results.
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2610.
  • Hagström, Linus, et al. (författare)
  • Introduction: Japan, the Great powers, and the coordination of North Korea Policy
  • 2006
  • Ingår i: North Korea Policy: Japan and the Great Powers. - Abingdon, Oxon, OX : Routledge. - 1134149980 - 9780203966655 - 0203966651 - 9781134149988 - 9781134149971 - 1134149972 - 0415399165 - 9780415399166 - 9781134149971 - 1134149972 - 0203966651 - 9780203966655 - 1134149980 - 9781134149933 - 9781134149988 - 113414993X - 9780415546904 - 0415546907 ; , s. 1-18
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • The primary aim of this book is to use North Korea policy as the subject for a case study to analyse Japanese foreign policy. Has the image of Japan as a curiously (or intelligibly) passive and reactive trading state remained an accurate one in the midst of the turbulent changes, both domestically and internationally, of the recent years? And how has the power of influence of Japanese foreign policy evolved relative to that of other important actors in the region during the last decade or so? These questions are examined by asking to what extent Japan was pursuing its North Korea policy autonomously of other involved actors in the early and mid-1990s - and to what extent and how Japan was exercising power over them - in the bilateral and multilateral interaction over such policy? Has the situation changed a decade or so later? The chapters of this book tackle these questions not only by examining Japan's North Korea policy (Chapter 1), but also by analysing 'the Japan factor' in the North Korea policy of other great powers (Chapters 3 - 7) and Japanese participation in multilateral forums (Chapter 8). North Korea (the Democratic People's Republic of Korea, DPRK) is treated here primarily as the focal pint for coordination efforts between Japan and other major actors in North-Asian politics. However, in order not to nurture and reproduce the historical tendency to objectify Korea more than necessary, the book also includes a chapter on North Korea's own policy orientations and images of its neighboring states (Chapter 2).
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