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Sökning: LAR1:gu > Jagers Peter 1941

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1.
  • Grandin, Karl, et al. (författare)
  • Nuclear Energy
  • 2010
  • Ingår i: AMBIO. - 0044-7447. ; 39:Suppl. 1, s. 26-30
  • Tidskriftsartikel (refereegranskat)abstract
    • Nuclear energy can play a role in carbon free production of electrical energy, thus making it interesting for tomorrow’s energy mix. However, several issues have to be addressed. In fission technology, the design of so-called fourth generation reactors show great promise, in particular in addressing materials efficiency and safety issues. If successfully developed, such reactors may have an important and sustainable part in future energy production. Working fusion reactors may be even more materials efficient and environmental friendly, but also need more development and research. The roadmap for development of fourth generation fission and fusion reactors, therefore, asks for attention and research in these fields must be strengthened.
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  • Jagers, Peter, 1941- (författare)
  • A plea for stochastic population dynamics
  • 2010
  • Ingår i: Journal of Mathematical Biology. - 0303-6812. ; 60:5, s. 761-764
  • Tidskriftsartikel (refereegranskat)abstract
    • It is argued that biological populations are finite and consisting of individuals with varying life span and reproduction, and that they should be thus modelled. Modern probability theory provides tools for this.
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  • Jagers, Peter, 1941-, et al. (författare)
  • Branching processes with deteriorating random environments
  • 2002
  • Ingår i: Journal of Applied Probability. - 0021-9002. ; 39, s. 395-401
  • Tidskriftsartikel (refereegranskat)abstract
    • We introduce Galton-Watson style branching processes in random environments which are deteriorating rather than stationary or independent. Some primary results on process growth and extinction probability are shown. Two simple examples are given.
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  • Jagers, Peter, 1941-, et al. (författare)
  • Convergence to the coalescent in populations of substantially varying size.
  • 2004
  • Ingår i: J. Appl. Probab.. - 0021-9002. ; 41:2, s. 368-378
  • Tidskriftsartikel (refereegranskat)abstract
    • Kingman's classical coalescent uncovers the basic pattern of genealogical trees of random samples of individuals in large but time-constant populations. Time is viewed as discrete and identified with non-overlapping generations. Reproduction can be very generally taken as exchangeable (meaning that the labelling of individuals in each generation carries no significance). Recent generalisations have dealt with population sizes exhibiting given deterministic or (minor) random fluctuations. We consider population sizes which constitute a stationary Markov chain, explicitly allowing large fluctuations in short times. Convergence of the genealogical tree, as population size tends to infinity, towards the (time-scaled) coalescent is simply proved under minimal conditions. As a result, a formula for effective population size obtains, generalising the well-knownharmonic mean expression for effective size.
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9.
  • Jagers, Peter, 1941-, et al. (författare)
  • Dependence and interaction in branching processes
  • 2013
  • Ingår i: Springer Proceedings in Mathematics and Statistics. - 2194-1009. - 9783642335488 ; 33, s. 325-333
  • Konferensbidrag (refereegranskat)abstract
    • Independence of reproducing individuals can be viewed as the very defining property of branching processes. It is crucial for the most famous results of the theory, the determination of the extinction probability and the dichotomy between extinction and exponential increase. In general processes, stabilisation of the age-distribution under growth follows, and indeed of the over-all population composition, and so do the many fine results of the area, like conditional stabilisation of the size of non-extinct subcritical processes. The last two decades have witnessed repeated attempts at treating branching processes with various kinds of dependence between individuals, ranging from local dependence between close relatives only to population size dependence. Of particular interest are very recent findings on processes that change from being supercritical to subcriticality at some threshold size, the carrying capacity of the habitat. We overview the development with an emphasis on these recent results. © Springer-Verlag Berlin Heidelberg 2013.
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10.
  • Jagers, Peter, 1941- (författare)
  • Extinction
  • 2009
  • Ingår i: Math. Pop Studies. - 0889-8490. ; 16:3, s. 175-176
  • Tidskriftsartikel (refereegranskat)
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  • Resultat 1-10 av 31
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