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    • Understanding precipitation in amino acid salt systems at process conditions 

      Aronu, Ugochukwu Edwin; Ciftja, Arlinda Fejzo; Kim, Inna; Hartono, Ardi (Peer reviewed; Journal article, 2013)
      Rapid screening experiment has been used to acquire first-hand information on the precipitation characteristics of 14 aqueous amino acid salt systems. Absorption tests at 40°C have shown that at high concentrations, amino ...

    • Understanding the patterns that neural networks learn from chemical spectra 

      Rieger, Laura Hannemose; Wilson, Max; Vegge, Tejs; Flores Cedeño, Eibar (Peer reviewed; Journal article, 2023)
      Analysing spectra from experimental characterization of materials is time consuming, susceptible to distortions in data, requires specific domain knowledge, and may be susceptible to biases in general heuristics under human ...

    • A unified and simple medium for growing model methanogens 

      Ngoumelah, Daniel Dzofou; Harnisch, Falk; Sulheim, Snorre; Heggeset, Tonje Marita Bjerkan; Aune, Ingvild Haugnes; Wentzel, Alexander; Kretzschmar, Jörg (Peer reviewed; Journal article, 2023)
      Apart from their archetypic use in anaerobic digestion (AD) methanogenic archaea are targeted for a wide range of applications. Using different methanogenic archaea for one specific application requires the optimization ...

    • Unimolecular Decomposition Reactions of Picric Acid and its Methylated Derivatives — A DFT Study 

      Wiik, Kristine; Høyvik, Ida-Marie; Unneberg, Erik; Jensen, Tomas Lunde; Swang, Ole (Peer reviewed; Journal article, 2022)
      To handle energetic materials safely, it is important to have knowledge about their sensitivity. Density functional theory (DFT) has proven a valuable tool in the study of energetic materials, and in the current work, DFT ...

    • The unique hybrid precipitate in a peak-aged Al-Cu-Mg-Ag alloy 

      Gazizov, Marat; Boev, A.O.; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Holmestad, Randi; Kaibyshev, Rustam; Aksyonov, D.A.; Krasnikov, V.S. (Peer reviewed; Journal article, 2021)
      The prevalent hardening phase forming in an Al-Cu-Mg-Ag alloy after peak-aging at 150 and 190 °C has been investigated using transmission electron microscopy methods. The precipitate atomic structure was determined. It is ...

    • Unraveling Enhanced Activity, Selectivity, and Coke Resistance of Pt–Ni Bimetallic Clusters in Dry Reforming 

      Niu, Juntian; Wang, Yalan; Liland, Shirley Elisabeth Sjø; Regli, Samuel K.; Yang, Jia; Rout, Kumar Ranjan; Luo, Jun; Rønning, Magnus; Ran, Jingyu; Chen, De (Peer reviewed; Journal article, 2021)
      By introducing Pt atoms into the surface of reduced hydrotalcite (HT)-derived nickel (Ni/HT) catalysts by redox reaction, we synthesized an enhanced active and stable Ni-based catalyst for methane dry reforming reaction. ...

    • Unraveling the roles of the reductant and free copper ions in LPMO kinetics 

      Stepnov, Anton; Forsberg, Zarah; Sørlie, Morten; Nguyen, Giang-Son; Wentzel, Alexander; Kjendseth, Åsmund Røhr; Eijsink, Vincent (Peer reviewed; Journal article, 2021)
      Background: Lytic polysaccharide monooxygenases (LPMOs) are monocopper enzymes that catalyze oxidative depolymerization of industrially relevant crystalline polysaccharides, such as cellulose, in a reaction that depends ...

    • Unscented Kalman Filter Based State and Parameter Estimation in Percussive Drilling Systems 

      Song, Xianfeng; Kane, Pascal-Alexandre; Abooshahab, Mohammad Ali (Chinese Control Conference (CCC);1934-1768, Chapter; Peer reviewed, 2019)
      Down-The-Hole (DTH) percussion tool is recognized for its high average rate of penetration (ROP), when drilling medium hard to very hard rock formations. This ROP which depends on the bit-rock contact conditions at the ...

    • Uptake and toxicity of methylmethacrylate-based nanoplastic particles in aquatic organisms 

      Booth, Andy; Hansen, Bjørn Henrik; Frenzel, Max; Johnsen, Heidi; Altin, Dag (Journal article; Peer reviewed, 2015)
      The uptake and toxicity of 2 poly(methylmethacrylate)-based plastic nanoparticles (PNPs) with different surface chemistries (medium and hydrophobic) was assessed using aquatic organisms selected for their relevance based ...

    • Use of a Distributed Micro-sensor System for Monitoring the Indoor Particulate Matter Concentration in the Atmosphere of Ferroalloy Production Plants 

      Myklebust, Håkon A Hartvedt Olsen; Aarhaug, Thor Anders; Tranell, Maria Gabriella (Peer reviewed; Journal article, 2022)
      Airborne particulate matter (PM) is a concern for both occupational health and the environment, and, in the ferroalloy industry, the level of such particles in the air can be considerable. Small, low-cost sensors for ...

    • Use of concentric hele-shaw cell for the study of displacement flow and interface tracking in primary cementing 

      Taheri, Amir; Ytrehus, Jan David; Lund, Bjørnar; Torsæter, Malin (Peer reviewed; Journal article, 2021)
      We present our new designed concentric Hele-Shaw cell geometry with dynamic similarity to a real field wellbore annulus during primary cementing, and then, the results of displacement flow of Newtonian and yield-stress ...

    • The Use of Eutectic Fe-Si-B Alloy as a Phase Change Material in Thermal Energy Storage Systems 

      Jiao, Jianmeng; Grorud, Bettina; Sindland, Caroline; Safarian, Jafar; Tang, Kai; Sellevoll, Kathrine; Tangstad, Merete (Journal article; Peer reviewed, 2019)
      Fe-26.38Si-9.35B eutectic alloy is proposed as a phase change material (PCM) as it exhibits high latent heat, high thermal conductivity, moderate melting point, and low cost. For successful implementation of it in the ...

    • The Use of Extracellular Membrane Vesicles for Immunization against Francisellosis in Nile Tilapia (Oreochromis niloticus) and Atlantic cod (Gadus morhua L.) 

      Mertes, Verena; Kashulin, Alexander; Lagos, Leidy; Ciani, Elia; Colquhoun, Duncan John; Haslene-Hox, Hanne; Sletta, Håvard; Sørum, Henning; Winther-Larsen, Hanne Cecilie (Peer reviewed; Journal article, 2021)
      Francisellosis in fish is caused by the facultative intracellular Gram-negative bacterial pathogens Francisella noatunensis ssp. noatunensis and Francisella orientalis. The disease is affecting both farmed and wild fish ...

    • The use of hydrogen as a potential reductant in the chromite smelting industry 

      Davies, Jamey; Paktunc, Dogan; Ramos-Hernandez, José Juan; Tangstad, Merete; Ringdalen, Eli; Beukes, Johan P.; Bessarabov, Dmitri G.; Du Preez, Stephanus P. (Peer reviewed; Journal article, 2022)
      The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction of chromite ore. Ever-increasing pressure on FeCr producers to ...

    • Use of metal-organics based solvents for CO2 capture 

      Heyn, Richard H; Aronu, Ugochukwu Edwin; Vevelstad, Solrun Johanne; Hoff, Karl Anders; Didriksen, Terje; Arstad, Bjørnar; Blom, Richard (Journal article; Peer reviewed, 2014)
      There are a number of metal-organic compounds that can loosely be considered CA mimics and which are known to absorb CO2 directly from the atmosphere. The metal-organic complex, {Zn[N[CH2(2-py)]3](μ-OH)}2(NO3)2 (I), is one ...

    • Using machine learning-based variable selection to identify hydrate related components from FT-ICR MS spectra 

      Gjelsvik, Elise Lunde; Fossen, Martin; Brunsvik, Anders; Tøndel, Kristin (Peer reviewed; Journal article, 2022)
      The blockages of pipelines caused by agglomeration of gas hydrates is a major flow assurance issue in the oil and gas industry. Some crude oils form gas hydrates that remain as transportable particles in a slurry. It is ...

    • The Utilization of Bauxite Residue with a Calcite-Rich Bauxite Ore in the Pedersen Process for Iron and Alumina Extraction 

      Lazou, Adamantia; Eijk, Casper van der; Tang, Kai; Balomenos, Efthymios; Kolbeinsen, Leiv; Safarian, Jafar (Peer reviewed; Journal article, 2021)
      Metallurgical grade alumina is produced worldwide through the well-known Bayer process, which unavoidably generates bauxite residue (BR, also known as red mud) in almost equal amounts to alumina. This study aims the ...

    • Utilization of dual - PSA technology for natural gas upgrading and integrated CO2 capture 

      Grande, Carlos Adolfo; Blom, Richard (Peer reviewed; Journal article, 2012)
      In this study, we have considered Pressure Swing Adsorption (PSA) technology natural gas purification and integrated CO2 capture. We present the utilization of Dual-PSA technology for obtaining pipeline-quality methane and ...

    • Utilization of waste heat for pre-heating of anodes 

      Grimstad, Martin; Elstad, Kim Ronny; Solheim, Asbjørn; Einarsrud, Kristian Etienne (The Minerals, Metals & Materials Series;2367-1181, Peer reviewed; Journal article, 2020)
      Carbon anodes are replaced on a regular basis in Hall–Héroult cells as they are consumed by electrochemical reactions. Upon insertion of new anodes, bath will freeze locally as a result of low bath superheat and comparatively ...

    • Vacancy diffusion in palladium hydrides 

      Polfus, Jonathan; Peters, Thijs; Bredesen, Rune; Løvvik, Ole Martin (Peer reviewed; Journal article, 2021)
      The self-diffusion coefficients of palladium in PdHx (x = 0, 0.25, 0.5, 0.75, 1) were studied using density functional theory to obtain the required thermodynamic and kinetic parameters. The enthalpy of migration decreased ...