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Träfflista för sökning "LAR1:gu ;pers:(Jagers Peter 1941)"

Sökning: LAR1:gu > Jagers Peter 1941

  • Resultat 1-10 av 24
  • [1]23Nästa
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  • 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.
  • 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.
  • 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.
  • Jagers, Peter, 1941- (författare)
  • Extinction
  • 2009
  • Ingår i: Math. Pop Studies. - 0889-8490. ; 16:3, s. 175-176
  • Tidskriftsartikel (refereegranskat)
  • Jagers, Peter, 1941- (författare)
  • Extinction, Persistence, and Evolution
  • 2011
  • Ingår i: Mathematics of Darwin's Legacy, Ed. by: Chalub, FACC; Rodrigues, JF; (Book Series: Mathematics and Biosciences in Interaction); (Conference on Mathematics of Darwin's Legacy, Univ Lisbon, Lisbon, PORTUGAL, NOV 23-24, 2009). - 978-3-0348-0121-8 ; s. 91
  • Konferensbidrag (refereegranskat)abstract
    • Extinction can occur for many reasons. We have a closer look at the most basic form, extinction of populations with stable but insufficient reproduction. Then we move on to competing populations and evolutionary suicide.
  • Jagers, Peter, 1941-, et al. (författare)
  • General branching processes in discrete time as random trees.
  • 2008
  • Ingår i: Bernoulli. - 1350-7265. ; 14:4, s. 949-962
  • Tidskriftsartikel (refereegranskat)abstract
    • The simple Galton-Watson process describes populations where individuals live one season and are then replaced by a random number of children. It can also be viewed as a way of generating random trees, each vertex being an individual of the family tree. This viewpoint has led to new insights and a revival of classical theory. We show how a similar reinterpretation can shed new light on the more interesting forms of branching processes that allow repeated bearings and, thus, overlapping generations. In particular, we use the stable pedigree law to give a transparent description of a size-biased version of general branching processes in discrete time. This allows us to analyse the xlog x condition for exponential growth of supercritical general processes, and also the relation between simple Galton-Watson and more general branching processes.
  • Jagers, Peter, 1941-, et al. (författare)
  • Markovian Paths to Extinction
  • 2007
  • Ingår i: Adv. Appl. Prob.. ; 39, s. 569-587
  • Tidskriftsartikel (refereegranskat)
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