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  • Elemental carbon measurements in European Arctic snow packs 

    Forsström, S.; Isaksson, Elisabeth; Skeie, Ragnhild Bieltvedt; Ström, Johan; Pedersen, CA; Hudson, S.R.; Berntsen, Terje Koren; Lihavainen, H.; Godtliebsen, Fred; Gerland, Sebastian (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-12-26)
    Black carbon (BC) and other light-absorbing particles deposited on snow and ice are known to perturb the surface radiative balance. There are few published observations of the concentration of these particles in the snow ...
  • Dynamic self-organisation of haematopoiesis and (a)symmetric cell division 

    Måløy, Marthe; Måløy, Frode; Jakobsen, Per; Brandsdal, Bjørn Olav (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-05)
    A model of haematopoiesis that links self-organisation with symmetric and asymmetric cell division is presented in this paper. It is assumed that all cell divisions are completely random events, and that the daughter ...
  • Statistics of Regional Surface Temperatures after 1900: Long-Range versus Short-Range Dependence and Significance of Warming Trends 

    Løvsletten, Ola; Rypdal, Martin wibe (Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
    This paper studies regional climate variability for the time period 1900–2013 using parsimonious stochastic models. Instrumental data records on 5° × 5°, 2° × 2°, and equal-area grids are examined. A long-range dependent ...
  • Spectral characteristics of instrumental and climate model surface temperatures 

    Fredriksen, Hege-Beate; Rypdal, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-05)
    The spatiotemporal temperature variability for several gridded instrumental and general circulation climate model data is characterized, contrasting power spectra of local and global temperatures, land and sea temperatures, ...
  • Early-warning signals for the onsets of Greenland interstadials and the younger dryas-preboreal transition 

    Rypdal, Martin wibe (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-20)
    The climate system approaches a tipping point if the prevailing climate state loses stability, making a transition to a different state possible. A result from the theory of randomly driven dynamical systems is that the ...
  • On Data-Independent Properties for Density-Based Dissimilarity Measures in Hybrid Clustering 

    Møllersen, Kajsa; Dhar, Subhra; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-12)
    Hybrid clustering combines partitional and hierarchical clustering for computational effectiveness and versatility in cluster shape. In such clustering, a dissimilarity measure plays a crucial role in the hierarchical ...
  • Are there multiple scaling regimes in Holocene temperature records? 

    Nilsen, Tine; Rypdal, Kristoffer; Fredriksen, Hege-Beate (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-04-28)
    In this article it is discussed how temperature variability on centennial timescales and longer can be described in a simplistic way. By analysing the scaling in late Holocene temperature reconstructions and longer temperature ...
  • Comment on "Scaling regimes and linear/nonlinear responses of last millennium climate to volcanic and solar forcing" by S. Lovejoy and C. Varotsos (2016) 

    Rypdal, Kristoffer; Rypdal, Martin Wibe (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-13)
    Lovejoy and Varotsos (2016) (L&V) analyse the temperature response to solar, volcanic, and solar plus volcanic forcing in the Zebiak–Cane (ZC) model, and to solar and solar plus volcanic forcing in the Goddard Institute ...
  • Late Quaternary temperature variability described as abrupt transitions on a 1/f noise background 

    Rypdal, Kristoffer; Rypdal, Martin Wibe (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-31)
    In order to have a scaling description of the climate system that is not inherently non-stationary, the rapid shifts between stadials and interstadials during the last glaciation (the Dansgaard-Oeschger events) cannot be ...
  • Global warming projections derived from an observation-based minimal model 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-29)
    A simple conceptual model for the global mean surface temperature (GMST) response to CO2 emissions is presented and analysed. It consists of linear long-memory models for the GMST anomaly response 1T to radiative forcing ...
  • Paris-toppmøtet og spillet om CO2-kvotene 

    Rypdal, Kristoffer (Chronicle; Kronikk, 2015-11-25)
  • Learning similarities between irregularly sampled short multivariate time series from EHRs 

    Mikalsen, Karl Øyvind; Bianchi, Filippo Maria; Soguero-Ruiz, Cristina; Skrøvseth, Stein Olav; Lindsetmo, Rolv-Ole; Revhaug, Arthur; Jenssen, Robert (Conference object; Konferansebidrag, 2016-12-04)
    A large fraction of the Electronic Health Records consists of clinical multivariate time series. Building models for extracting information from these is important for improving the understanding of diseases, patient ...
  • COPD in primary lung cancer patients: prevalence and mortality 

    Ytterstad, Elinor; Moe, Per Christian; Hjalmarsen, Audhild (Journal article; Peer reviewed; Tidsskriftartikkel, 2016-03-23)
    Background: Previous studies have relied on international spirometry criteria to diagnose COPD in patients with lung cancer without considering the effect lung cancer might have on spirometric results. The aim of this study ...
  • A generalization of weight polynomials to matroids 

    Johnsen, Trygve; Roksvold, Jan Nyquist; Verdure, Hugues (Tidsskriftartikkel; Peer reviewed, 2015-11-11)
    Generalizing polynomials previously studied in the context of linear codes, we define weight polynomials and an enumerator for a matroid M. Our main result is that these polynomials are determined by Betti numbers associated ...
  • A generalization of Kung’s theorem 

    Johnsen, Trygve; Shiromoto, Keisuke; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-01)
    We give a generalization of Kung’s theorem on critical exponents of linear codes over a finite field, in terms of sums of extended weight polynomials of linear codes. For all i=k+1,…,ni=k+1,…,n, we give an upper bound on ...
  • Stanley-Reisner resolution of constant weight linear codes 

    Johnsen, Trygve; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-08)
    Given a constant weight linear code, we investigate its weight hierarchy and the Stanley–Reisner resolution of its associated matroid regarded as a simplicial complex. We also exhibit conditions on the higher weights ...
  • Betti numbers associated to the facet ideal of a matroid 

    Johnsen, Trygve; Roksvold, Jan Nyquist; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-06)
    To a matroid M with n edges, we associate the so-called facet ideal F(M)⊂k[x1,…,xn] , generated by monomials corresponding to bases of M. We show that when M is a graph, the Betti numbers related to an ℕ0-graded minimal ...
  • Stem cell regulation: Implications when differentiated cells regulate symmetric stem cell division 

    Høyem, Marte Rørvik; Måløy, Frode; Jakobsen, Per; Brandsdal, Bjørn Olav (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-19)
    We use a mathematical model to show that if symmetric stem cell division is regulated by differentiated cells, then changes in the population dynamics of the differentiated cells can lead to changes in the population ...
  • Dørene lukkes for klimamålene 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel, 2016)
    FNs klimapanel har utarbeidet en rekke prognoser for økningen i global middeltemperatur basert på ulike scenarier for ­ut­vik­lingen av utslipp av drivhusgasser og partikler fra menneskelig aktivitet. Disse prognosene er ...
  • Holdbarhet på klippfisk. Vekst av rødmidd i klippfisk lagret ved forhøyede temperaturer (AP2) 

    Lorentzen, Grete Elisabeth; Johansen, Jørn-Owe; Breiland, Mette Serine Wesmajervi; Dahl, Reidun Wenche; Sandaker, Elin Kristianne; Ytterstad, Elinor (Research report; Forskningsrapport, 2016-02)
    I prosjektet «Holdbarhet på klippfisk» er det foretatt studier for å fastsette holdbarhet på klippfisk basert på vekst av rødmidd. Denne rapporten referer til studier hvor klippfisk er lagret ved forhøyede temperaturer. ...

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