Browsing Faculty of Mathematics and Natural Sciences by Title

Now showing items 4889-4908 of 9919

    • Long‑term demise of sub‑Antarctic glaciers modulated by the Southern Hemisphere Westerlies 

      Bakke, Jostein; Paasche, Øyvind; Schaefer, Joerg M.; Timmermann, Axel (Journal article; Peer reviewed, 2021)
      The accelerated melting of ice on the Antarctic Peninsula and islands in the sub-Antarctic suggests that the cryosphere is edging towards an irreversible tipping point. How unusual is this trend of ice loss within the frame ...

    • Looking at the Stars 

      Prieto, Elena; Sloper, Christian (Journal article, 2006-02-28)
      The problem of packing k vertex-disjoint copies of a graph H into another graph G is NP-complete if H has more than two vertices in some connected component. In the framework of parameterized complexity we analyze a ...

    • Looking forward through the past: identification of 50 priority research questions in palaeoecology 

      Seddon, Alistair; Mackay, Anson W.; Baker, Ambroise G.; Birks, Harry John Betteley; Breman, Elinor; Buck, C. E.; Ellis, Erle C.; Froyd, Cynthia A.; Gill, Jacquelyn L.; Gillson, Lindsey; Johnson, Edward A.; Jones, Vivienne J.; Juggins, Stephen; Macias-Fauria, Marc; Mills, Keely; Morris, Jesse L.; Nogués-Bravo, David; Punyasena, Surangi W.; Roland, Thomas P.; Tanentzap, Andrew; Willis, Katherine Jane; Aberhan, Martin; van Asperen, Eline N.; Austin, William E. N.; Battarbee, Richard W.; Bhagwat, Shonil; Belanger, Christina L.; Bennett, Keith D.; Birks, Hilary H.; Ramsey, Christopher Bronk; Brooks, Stephen J.; de Bruyn, Mark; Butler, Paul G.; Chambers, F. M.; Clarke, Stewart J.; Davies, Althea L.; Dearing, John A.; Ezard, Thomas H. G.; Feurdean, Angelica; Flower, Roger J.; Gell, Peter; Hausmann, Sonja; Hogan, Erika J.; Hopkins, Melanie J.; Jeffers, Elizabeth S.; Korhola, Atte; Marchant, Robert; Kiefer, Thorsten; Lamentowicz, Mariusz; Larocque-Tobler, Isabelle; López-Merino, Lourdes; Liow, Lee Hsiang; McGowan, Suzanne; Miller, Joshua H.; Montoya, Encarni; Morton, Oliver; Nogué, Sandra; Onoufriou, Chloe; Boush, Lisa P.; Rodriguez-Sanchez, F; Rose, Neil L.; Sayer, Carl D.; Shaw, Helen E.; Payne, Richard; Simpson, Gavin; Sohar, Kadri; Whitehouse, Nicki J.; Williams, John W.; Witkowski, Andrzej (Peer reviewed; Journal article, 2014)

    • Loop current variability as trigger of coherent gulf stream transport anomalies 

      Hirschi, Joël J.-M.; Frajka-Williams, Eleanor; Blaker, Adam T; Sinha, Bablu; Coward, Andrew; Hyder, Pat; Biastoch, Arne; Böning, Claus; Barnier, Bernard; Penduff, Thierry; Garcia, Ixetl; Fransner, Filippa; Madec, Gurvan (Journal article; Peer reviewed, 2019)
      Satellite observations and output from a high-resolution ocean model are used to investigate how the Loop Current in the Gulf of Mexico affects the Gulf Stream transport through the Florida Straits. We find that the expansion ...

    • Loop-checking and the uniform word problem for join-semilattices with an inflationary endomorphism 

      Bezem, Marc; Coquand, Thierry (Journal article; Peer reviewed, 2022)
      We solve in polynomial time two decision problems that occur in type checking when typings depend on universe level constraints.

    • Losing the ‘arms race’: multiresistant salmon lice are dispersed throughout the North Atlantic Ocean 

      Fjørtoft, Helene Børretzen; Nilsen, Frank; Besnier, Francois; Stene, Anne; Tveten, Ann-Kristin; Bjørn, Pål Arne; Aspehaug, Vidar Teis; Glover, Kevin Alan (Journal article; Peer reviewed, 2021)
      Nothing lasts forever, including the effect of chemicals aimed to control pests in food production. As old pesticides have been compromised by emerging resistance, new ones have been introduced and turned the odds back in ...

    • Loss and Reformation of Ruthenium Alkylidene: Connecting Olefin Metathesis, Catalyst Deactivation, Regeneration, and Isomerization 

      Engel, Julien; Smit, Wietse; Foscato, Marco; Occhipinti, Giovanni; Törnroos, Karl Wilhelm; Jensen, Vidar Remi (Peer reviewed; Journal article, 2017)
      Ruthenium-based olefin metathesis catalysts are used in laboratory-scale organic synthesis across chemistry, largely thanks to their ease of handling and functional group tolerance. In spite of this robustness, these ...

    • Loss of sea ice during winter north of Svalbard 

      Onarheim, Ingrid Husøy; Smedsrud, Lars Henrik; Ingvaldsen, Randi; Nilsen, Frank (Peer reviewed; Journal article, 2014-06-05)
      Sea ice loss in the Arctic Ocean has up to now been strongest during summer. In contrast, the sea ice concentration north of Svalbard has experienced a larger decline during winter since 1979. The trend in winter ice area ...

    • Loss of stomach, loss of appetite? Sequencing of the ballan wrasse (Labrus bergylta) genome and intestinal transcriptomic profiling illuminate the evolution of loss of stomach function in fish 

      Lie, Kai Kristoffer; Tørresen, Ole K.; Solbakken, Monica Hongrø; Rønnestad, Ivar; Tooming-Klunderud, Ave; Nederbragt, Alexander Johan; Jentoft, Sissel; Sæle, Øystein (Peer reviewed; Journal article, 2018-03-06)
      Background: The ballan wrasse (Labrus bergylta) belongs to a large teleost family containing more than 600 species showing several unique evolutionary traits such as lack of stomach and hermaphroditism. Agastric fish are ...

    • Loss-function learning for cell type mapping of spatial transcriptomics using single-cell RNA-seq data 

      Skaar, Ørjan Løseth (Master thesis, 2023-06-01)
      Breast cancers are complex cellular ecosystems consisting of multiple cell types. Heterotypic interactions and their unique gene expression profiles play central roles in cancer progression and response to therapy. However, ...

    • Lossy Kernelization of Same-Size Clustering 

      Bandyapadhyay, Sayan; Fomin, Fedor; Golovach, Petr; Purohit, Nidhi; Simonov, Kirill (Journal article; Peer reviewed, 2023)
      In this work, we study the k-median clustering problem with an additional equal-size constraint on the clusters from the perspective of parameterized preprocessing. Our main result is the first lossy (2-approximate) ...

    • Lost in Translation? Multiple Discursive Strategies and the Interpretation of Sustainability in the Norwegian Salmon Farming Industry 

      Aarset, Bernt; Carson, Siri Granum; Wiig, Heidi; Måren, Inger Elisabeth; Marks, Jessica (Journal article; Peer reviewed, 2020-04-04)
      The term ‘sustainability’ is vague and open to interpretation. In this paper we analyze how firms use the term in an effort to make the concept their own, and how it becomes a premise for further decisions, by applying a ...

    • A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene 

      Irvali, Nil; Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Rosenthal, Yair; Born, Andreas; Kleiven, Helga Flesche (Peer reviewed; Journal article, 2020-01-07)
      The Greenland Ice Sheet (GIS) has been losing mass at an accelerating rate over the recent decades. Models suggest a possible temperature threshold between 0.8 and 3.2 °C, beyond which GIS decline becomes irreversible. The ...

    • Low Level Jet Streams at the Sea Ice Edge - Numerical Simulations using WRF 

      Keiderling, Stefan (Master thesis, 2013-06-03)
      The goal of the presented thesis is to investigate the formation of low level jets at the sea ice edge. Differential heating creates very sharp fronts at the ice edge. A transversal circulation, initiated by altered pressure ...

    • Low Level Jets over the Southern North Sea 

      Wagner, David; Steinfeld, Gerald; Witha, Björn; Wurps, Hauke; Reuder, Joachim (Peer reviewed; Journal article, 2019-12-02)
      An extensive analysis of Low Level Jets (LLJs) over the Southern North Sea is presented. The study is based on observational data from a wind LiDAR and a passive microwave radiometer, operated from May 2015 to October 2016 ...

    • Low Molecular Weight Hydrogel for Wound Healing 

      Gu, Shangyan; Lu, Yu; Wang, Yuji; Lu, Wensheng; Wang, Wei (Journal article; Peer reviewed, 2023)
      Octadecylazanediyl dipropionic acid (C18ADPA) is a zwitterionic amphiphile with a dendritic headgroup. C18ADPA self-assembles to lamellar networks, which encompasses water and forms a low-molecular-weight hydrogel (LMWG). ...

    • Low Power Giga Bit Transceiver (lpGBT) Test-Suite 

      Jensen, Sander (Master thesis, 2023-12-20)
      The ALICE detector, one of the key instruments at CERN's LHC, is dedicated to capturing and measuring the properties of particles generated in high-energy particle collisions. To enhance its capabilities for studying these ...

    • Low Salinity Surfactant Flooding in Sandstone Cores 

      Johannessen, Annette Meland (Doctoral thesis, 2018-01-26)
      A new generation enhanced oil recovery (EOR) methods comes from combining techniques to make the overall process more efficient than either of the processes alone. These combined methods are often called hybrid EOR methods, ...

    • Low Salinity Waterflood in Combination with Surfactant/Polymer: Effect of Brine Composition 

      Mjøs, Jon Endre Seljeset (Master thesis, 2014-06-02)
      The effect of low salinity water (LSW) on enhanced oil recovery has been known for decades. Although much research is done on the topic, a general agreement of the prevailing mechanism for the low salinity effect has still ...

    • Low Salinity Waterflood in Combination with Surfactant/Polymer; Effect of Surfactant Slug Size 

      Al-Ajmi, Adnan Ibrahim Ahmed (Master thesis, 2014-06-02)
      In last years, there has been a growing interest in the effect of reducing salinity of injected water in oil recovery. Many studies have showed that low salinity waterflooding is a promising method that can lead to a ...