Now showing items 454-473 of 519

    • Tailored Porosities of the Cathode Layer for Improved Polymer Electrolyte Fuel Cell Performance 

      Zlotorowicz, Agnieszka; Jayasayee, Kaushik; Dahl, Paul Inge; Thomassen, Magnus Skinlo; Kjelstrup, Signe (Journal article; Peer reviewed, 2015)
      We show experimentally for the fi rst time that the introduction of macro-pores in the nanoporous catalyst layer of a polymer electrolyte membrane fuel cell can improve its performance. We have ach- ieved a Pt utilization ...
    • TD-DFT based fine-tuning of molecular excitation energies using evolutionary algorithms 

      Abburu, Sailesh; Venkatraman, Vishwesh; Alsberg, Bjørn Kåre (Journal article; Peer reviewed, 2016)
      An evolutionary de novo design method is presented to fine-tune the excitation energies of molecules calculated using time-dependent density functional theory (TD-DFT). The approach is applied to a π-conjugated molecular ...
    • Temperature anisotropy at equilibrium reveals nonlocal entropic contributions to interfacial properties 

      Wilhelmsen, Øivind; Trinh, Thuat; Lervik, Anders (Journal article, 2018)
      Density gradient theory for fluids has played a key role in the study of interfacial phenomena for a century. In this work, we revisit its fundamentals by examining the vapor-liquid interface of argon, represented by the ...
    • Ten-year trends in atmospheric mercury concentrations, meteorological effects and climate variables at Zeppelin, Ny-Ålesund 

      Berg, Torunn; Cole, AS; Engelsen, Ola; Steffen, A; Pfaffhuber, Katrine Aspmo (Journal article; Peer reviewed, 2013)
      Results from ten years of gaseous elemental mercury (GEM) measurements at Zeppelin station, Ny-A° lesund, Svalbard, show no overall annual trend between 2000 and 2009. Seasonal trend analysis showed significantly ...
    • Ten-year trends of atmospheric mercury in the high Arctic compared to Canadian sub-Arctic and mid-latitude sites 

      Cole, AS; Steffen, A; Aspmo, Katrine; Berg, Torunn; Pilote, Martin; Poissant, Laurelier; Tordon, R; Hung, Hayley (Journal article; Peer reviewed, 2013)
      Global emissions of mercury continue to change at the same time as the Arctic is experiencing ongoing climatic changes. Continuous monitoring of atmospheric mercury provides important information about long-term trends in ...
    • The Dalton quantum chemistry program system 

      Aidas, Kestutis; Angeli, Celestino; Bak, Keld L.; Bakken, Vebjørn; Bast, Radovan; Boman, Linus; Christiansen, Ove; Cimiraglia, Renzo; Coriani, Sonja; Dahle, Pål; Dalskov, Erik K.; Ekström, Ulf Egil; Enevoldsen, Thomas; Eriksen, Janus J.; Ettenhuber, Patrick; Fernández, Berta; Ferrighi, Lara; Fliegl, Heike; Frediani, Luca; Hald, Kasper; Halkier, Asger; Hattig, Christof; Heiberg, Hanne; Helgaker, Trygve; Hennum, Alf Christian; Hettema, Hinne; Hjertenæs, Eirik; Høst, Stine; Høyvik, Ida Marie; Iozzi, Maria Francesca; Jansik, Brannislav; Jensen, Hans-Jørgen Aa.; Jonsson, Dan Johan; Jørgensen, Poul; Kauczor, Johanna; Kirpekar, Sheela; Kjærgaard, Thomas; Klopper, Wim; Knecht, Stefan; Kobayashi, Rika; Koch, Henrik; Kongsted, Jacob; Krapp, Andreas; Kristensen, Kasper; Ligabue, Andrea; Lutnæs, Ola B.; Melo, Juan I.; Mikkelsen, Kurt V.; Myhre, Rolf Heilemann; Neiss, Christian; Nielsen, Christian B.; Norman, Patrick; Olsen, Jeppe; Olsen, Jogvan Magnus H.; Osted, Anders; Packer, Martin J.; Pawlowski, Filip; Pedersen, Thomas Bondo; Provasi, Patricio F.; Reine, Simen Sommerfelt; Rinkevicius, Zilvinas; Ruden, Torgeir A.; Ruud, Kenneth; Rybkin, Vladimir V.; Salek, Pawel; Samson, Claire C. M.; Sanchez de Meras, Alfredo; Saue, Trond; Sauer, Stephan P. A.; Schimmelpfennig, Bernd; Sneskov, Kristian; Steindal, Arnfinn Hykkerud; Sylvester-Hvid, Kristian O.; Taylor, Peter R.; Teale, Andrew M.; Tellgren, Erik; Tew, David P.; Thorvaldsen, Andreas J.; Thøgersen, Lea; Vahtras, Olav; Watson, Mark A.; Wilson, David J. D.; Ziolkowski, Marcin; Ågren, Hans (Journal article; Peer reviewed, 2014)
      Dalton is a powerful general-purpose program system for the study of molecular electronic structure at the Hartree–Fock, Kohn–Sham, multiconfigurational self-consistent-field, Møller–Plesset, configuration-interaction, and ...
    • The dye-sensitized solar cell database 

      Venkatraman, Vishwesh; Raju, Rajesh; Economopoulos, Solon; Alsberg, Bjørn Kåre (Journal article; Peer reviewed, 2018)
      Dye-sensitized solar cells (DSSCs) have garnered a lot of attention in recent years. The solar energy to power conversion efficiency of a DSSC is influenced by various components of the cell such as the dye, electrolyte, ...
    • The Effects of Macronutrient Enrichments (ammonium) on the Distribution of Four Bioactive Trace Metals (Cd, Mo, Ni, Cu) in Seawater and Planktonic Biomass. 

      Hunnestad, Annie Vera (Master thesis, 2012)
      Environmental impacts of aquaculture can be widespread and serious, and one of the problems connected to this activity is the release of waste in the form of macronutrients. One important aspect is the potential of a shift ...
    • The Influence of Alternating Current on the Polarization Behavior of Stainless Steels 

      Hagen, Catalina H. Musinoi (Master thesis, 2013)
      In later years direct electrical heating (DEH) based on the use of alternating current (AC) has replaced traditional chemical based methods for hydrate formation control in subsea flow lines. The problem with the AC-method ...
    • The Influence of Chemical Composition on Streamer Initiation and Propagation in Dielectric Liquids 

      Ingebrigtsen, Stian (Doktoravhandlinger ved NTNU, 1503-8181; 2008:264, Doctoral thesis, 2008)
      Effects of electron-attaching and electron-releasing additives in cyclohexane on the initiation and propagation of positive and negative non-breakdown streamers have been studied qualitatively and quantitatively. Fast ...
    • The Methylococcus capsulatus (Bath) Secreted Protein, MopE, Binds Both Reduced and Oxidized Copper 

      Ve, Thomas; Mathisen, Karina; Helland, Ronny; Karlsen, Odd Andre; Fjellbirkeland, Anne; Røhr, Åsmund Kjendseth; Andersson, K. Kristoffer; Pedersen, Rolf B.; Lillehaug, Johan R.; Jensen, Harald B. (Journal article; Peer reviewed, 2012)
    • The Nasal Geometry of the Reindeer Gives Energy-Efficient Respiration 

      Magnanelli, Elisa; Wilhelmsen, Øivind; Acquarone, Mario; Folkow, Lars; Kjelstrup, Signe (Journal article; Peer reviewed, 2016)
      Reindeer in the arctic region live under very harsh conditions and may face temperatures below 233 K. Therefore, efficient conservation of body heat and water is important for their survival. Alongside their insulating ...
    • The Permselectivity and Water Transference Number of Ion Exchange Membranes in Reverse Electrodialysis 

      Zlotorowicz, Agnieszka; Strand, Robin Viktor; Burheim, Odne Stokke; Wilhelmsen, Øivind; Kjelstrup, Signe (Journal article; Peer reviewed, 2016)
      Reverse electrodialysis of saline solutions (RED) is a renewable energy technology with large potential. Key components in the system are the ion exchange membranes. This work evaluates the efficiency of commercially ...
    • The persistent spin helix in the presence of hyperfine interactions 

      Qvist, Jørgen Holme (Master thesis, 2018)
      We study the effect of hyperfine interaction in the persistent spin helix (PSH) by investigating the nuclear spin pumping caused by non-equilibrium electron spin dynamics. In the first two chapters we rederive, based on ...
    • Thermal Conductivity, Heat Sources and Temperature Profiles of Li-ion Batteries 

      Burheim, Odne Stokke; Onsrud, Morten Andreas; Pharoah, John George; Vullum-Bruer, Fride; Vie, Preben Joakim Svela (Journal article; Peer reviewed, 2014)
      In this paper we report the thermal conductivity of several commercial and non-commercial Li-ion secondary battery electrode materials with and without electrolytesolvents. We also measure the Tafel potential, the ohmic ...
    • Thermal conductivity and internal temperature profiles of Li-ion secondary batteries 

      Richter, Frank; Kjelstrup, Signe; Vie, Preben Joakim Svela; Burheim, Odne Stokke (Journal article, 2017)
      In this paper we report the thermal conductivity for several battery components. Materials were obtained from several electrode- and separator suppliers, and some were extracted from commercial batteries. We measured with ...
    • Thermal conductivity and temperature profiles in carbon electrodes for supercapacitors 

      Burheim, Odne Stokke; Aslan, M; Atchison, JS; Presser, V (Journal article, 2014)
      The thermal conductivity of supercapacitor film electrodes composed of activated carbon (AC), AC with 15 mass% multi-walled carbon nanotubes (MWCNTs), AC with 15 mass% onion-like carbon (OLC), and only OLC, all mixed with ...
    • Thermal conductivity of carbon dioxide from non-equilibrium molecular dynamics: a systematic study of several common force fields 

      Trinh, Thuat; Vlugt, Thijs J.H.; Kjelstrup, Signe (Journal article; Peer reviewed, 2014)
      We report a systematic investigation of the thermal conductivity of various three-site models of carbon dioxide (CO2) using nonequilibrium molecular dynamics in the temperature range 300–1000 K and for pressures up to 200 ...
    • Thermodynamic Characterization Of Two Layers Of CO2 On A Graphite Surface 

      Trinh, Thuat; Bedeaux, Dick; Simon, Jean-Marc; Kjelstrup, Signe (Journal article; Peer reviewed, 2014)
      We find by examination of density profiles that carbon dioxide adsorbs on graphite in two distinct layers. We report the activity coefficient, entropy and enthalpy for CO2 in each layer using a convenient computational ...