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    • Filler metal distribution and processing stability in laser-arc hybrid welding of thick HSLA steel 

      Bunaziv, Ivan; Wenner, Sigurd; Ren, Xiaobo; Frostevarg, Jan; Kaplan, Alexander F.H.; Akselsen, Odd Magne (Peer reviewed; Journal article, 2020)
      Welds made by high power laser beam have deep and narrow geometry. Addition offiller wire by the arc source,forming the laser-arc hybrid welding (LAHW) process, is very important to obtain required mechanical prop-erties. ...

    • Finding synergy between renewables and coal: Flexible power and hydrogen production from advanced IGCC plants with integrated CO2 capture 

      Szima, Szabolcs; Arnáiz del Pozo, Carlos; Cloete, Schalk Willem Petrus; Chiesa, Paolo; Álvaro, Ángel Jiménez; Cormos, Ana-Maria; Amini, Shahriar (Peer reviewed; Journal article, 2021)
      Variable renewable energy (VRE) has seen rapid growth in recent years. However, VRE deployment requires a fleet of dispatchable power plants to supply electricity during periods with limited wind and sunlight. These plants ...

    • First Approach to Measure Interfacial Rheology at High-Pressure Conditions by the Oscillating Drop Technique 

      Barrabino, Albert; Holt, Torleif; Bjørkvik, Bård Johan Arnt; Lindeberg, Erik Gøsta Brun (Peer reviewed; Journal article, 2021)
      An oscillating drop rheometer capable of operating under conditions of high pressure and high temperature has been built. The oscillating drop mechanism was able to support pressures as high as 1300 bar and successfully ...

    • First principle calculations of pressure dependent yielding in solute strengthened aluminium alloys 

      Frafjord, Jonas; Ringdalen, Inga Gudem; Hopperstad, Odd Sture; Holmestad, Randi; Friis, Jesper (Peer reviewed; Journal article, 2020)
      The pressure dependence of the yield stress in solute strengthened aluminium alloys is investigated by first principle calculations. The solute elements studied are magnesium, silicon and copper. A fixed boundary cluster ...

    • First-principles study of tensile and shear strength of an Fe2Al5//Fe interface 

      Khalid, Muhammad Zeeshan; Friis, Jesper; Ninive, Per Harald; Marthinsen, Knut; Ringdalen, Inga Gudem; Strandlie, Are (Peer reviewed; Journal article, 2021)
      First-principles virtual tensile and shear strength calculations have been performed on the Fe2Al5// Fe4Al13 and -AlFeSi// Fe4Al13 interfaces. The Fast Inertial Relaxation Engine (FIRE) algorithm is used for optimizing ...

    • Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters 

      Gavrilovic, Ljubisa; Jørgensen, Erik Andreas; Pandey, Umesh; Putta, Koteswara Rao; Rout, Kumar Ranjan; Rytter, Erling; Hillestad, Magne; Blekkan, Edd Anders (Peer reviewed; Journal article, 2020)
      Fischer-Tropsch synthesis has been investigated over a commercial type cobalt-based catalyst (20 %Co/0.5 %Re/γ-Al2O3) by varying the H2/CO ratio (2.55–1.12), CO conversion (15–75 %), reaction temperature (210 °C, 230 °C), ...

    • Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters 

      Gavrilovic, Ljubisa; Jørgensen, Erik Andreas; Pandey, Umesh; Putta, Koteswara Rao; Rout, Kumar Ranjan; Rytter, Erling; Hillestad, Magne; Blekkan, Edd Anders (Peer reviewed; Journal article, 2020)
      Fischer-Tropsch synthesis has been investigated over a commercial type cobalt-based catalyst (20 %Co/0.5 %Re/γ-Al2O3) by varying the H2/CO ratio (2.55–1.12), CO conversion (15–75 %), reaction temperature (210 °C, 230 °C), ...

    • Fischer-Tropsch synthesis—Investigation of the deactivation of a Co catalyst by exposure to aerosol particles of potassium salt 

      Gavrilovic, Ljubisa; Brandin, Jan; Holmen, Anders; Venvik, Hilde Johnsen; Myrstad, Rune; Blekkan, Edd Anders (Journal article; Peer reviewed, 2018)
      The influence of potassium species on a Co based Fischer-Tropsch catalyst was investigated using an aerosol deposition technique. This way of poisoning the catalyst was chosen to simulate the actual potassium behaviour ...

    • Flame spray pyrolysis of electrode materials for energy applications 

      Dahl, Paul Inge; Thomassen, Magnus Skinlo; Rausseo, Luis César Colmenares; Barnet, Alejandro; Lomas, Scott; Vullum, Per Erik; Hanetho, Sidsel Meli; Mokkelbost, Tommy (Peer reviewed; Journal article, 2015)
      Flame spray pyrolysis (FSP) was applied to produce nanopowders of Ti1-xMxO2 and Sn1-xMxO2, where x = 0.05 and M = Nb/Sb, for use as catalyst support materials in PEM fuel cells/ electrolysers. FSP powders in the SnO2-IrO2 ...

    • Flame spray pyrolysis of tin oxide-based Pt catalysts for PEM fuel cell applications 

      Dahl, Paul Inge; Rausseo, Luis César Colmenares; Barnett, Alejandro; Lomas, Scott; Vullum, Per Erik; Kvello, Jannicke Hatlø; Tolchard, Julian R; Hanetho, Sidsel Meli; Mokkelbost, Tommy (Journal article; Peer reviewed, 2017)

    • Flexible Hybrid and Single-Component Aerogels: Synthesis, Characterization, and Applications 

      Fijalkowski, Mateusz; Coufal, Radek; Ali, Azam; Adach, Kinga; Petrik, Stanislav; Bu, Huaitian; Karl, Christian (Peer reviewed; Journal article, 2023)
      The inherent disadvantages of traditional nonflexible aerogels, such as high fragility and moisture sensitivity, severely restrict their applications. To address these issues, different techniques have been used to incorporate ...

    • Flexible power and hydrogen production: Finding synergy between CCS and variable renewables 

      Cloete, Schalk Willem Petrus; Hirth, Lion (Journal article; Peer reviewed, 2020)
      The expansion of wind and solar power is creating a growing need for power system flexibility. Dispatchable power plants with CO2 capture and storage (CCS) offer flexibility with low CO2 emissions, but these plants become ...

    • Flow-based method for biofilm microbiota enrichment and exploration of metagenomes 

      Hageskal, Gunhild; Heggeset, Tonje Marita Bjerkan; Nguyen, Giang-Son; Haugen, Tone; Jønsson, Malene; Egas, Conceição; Hidalgo, Aurelio; Wentzel, Alexander; Lewin, Anna (Peer reviewed; Journal article, 2022)
      Most bacteria live in bioflms in their natural habitat rather than the planktonic cell stage that dominates during traditional laboratory cultivation and enrichment schemes. The present study describes the establishment ...

    • Flowability of Dry and Water Wet Barite Powder 

      Skorpa, Ragnhild; Feneuil, Blandine Fleur Prudence; von Hafenbrädl, Franz O.; Ratnayake, Chandana (Peer reviewed; Journal article, 2022)
      Barite is added to drilling fluids as weight material to increase its density. Over time, when the drilling fluids are left static in the annulus, gravitational forces will make the barite settle out. This settled barite ...

    • Fluidized bed calcination of cement raw meal: Laboratory experiments and CPFD simulations 

      Samani, Nastaran Ahmadpour; Jayarathna, Chameera; Tokheim, Lars-Andre (Peer reviewed; Journal article, 2020)
      The chemical and thermal processes associated with the decarbonation and fuel combustion in the cement kiln process produce a large amount of carbon dioxide (CO2) contributing with around 8 % of the global CO2 emissions. ...

    • Flux-Reducing Tendency of Pd-Based Membranes Employed in Butane Dehydrogenation Processes 

      Peters, Thijs; Stange, Marit Synnøve Sæverud; Bredesen, Rune (Peer reviewed; Journal article, 2020)
      We report on the effect of butane and butylene on hydrogen permeation through thin state-of-the-art Pd–Ag alloy membranes. A wide range of operating conditions, such as temperature (200–450 °C) and H2/butylene (or butane) ...

    • The Formation and Disintegration of Rafts from Different Aluminas and Fines 

      Gylver, Sindre Engzelius; Bekkevoll, Simen; Rørvik, Stein; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2022)
      Raft formation is a frequently encountered problem during alumina feeding in the Hall-Héroult-process and will delay alumina from being dissolved into the melt. The mechanisms for the formation and disintegration of rafts ...

    • Formation of aluminium carbide in Hall-Héroult electrolysis cell environments 

      Novák, Bronislav; Ratvik, Arne Petter; Wang, Zhaohui; Grande, Tor (Journal article; Peer reviewed, 2018)
      The formation and dissolution of aluminium carbide under conditions similar to the chemical and electrochemical environments in the Hall-Héroult process were studied in laboratory cells, including cells with reversed ...

    • Formation of Carbon Build-Up on the Flue Wall of Anode Baking Furnace 

      Wang, Zhaohui; Rørvik, Stein; Ratvik, Arne Petter; Grande, Tor (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2017)
      A hard carbon build-up layer often forms on the flue wall surface in anode baking furnaces. The layer accumulates over thermal circles and needs to be mechanically removed regularly to ensure sufficient space for the anodes ...

    • Formation of hydrogen bubbles in Pd-Ag membranes during H2 permeation 

      Peters, Thijs; Almeida Carvalho, Patricia; Stange, Marit Synnøve Sæverud; Bredesen, Rune (Peer reviewed; Journal article, 2019)
      Palladium membranes used for hydrogen separation seemingly develop cavities filled with hydrogen, i.e. hydrogen bubbles, along the grain boundaries. These bubbles may represent initial stages of pinhole formation that lead ...