Browsing NTNU Open by Author "Aune, Ragnhild Elizabeth"
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Automated Metal Cleanliness Analyzer (AMCA) – An Alternative Assessment of Metal Cleanliness in Aluminum Melts
Zedel, Hannes; Fritzsch, Robert; Akhtar, Shahid; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2021)The established industry standards for assessing the cleanliness of aluminum melts are PoDFA (Porous Disc Filtration Apparatus) and LiMCA (Liquid Metal Cleanliness Analyzer) analyses. PoDFA provides the necessary qualitative ... -
“Caring for Breast Cancer Patients Is a Work That Brings Sorrow”: A Qualitative Interview Study with Nurses in Tanzania
Kidayi, Paulo L.; Manhica, Hélio; Nakazzi, Sandra; Mtuya, Christina C.; Aune, Ragnhild Elizabeth; Serventi, Furaha; Mahande, Michael Johnson; Björling, Gunilla (Peer reviewed; Journal article, 2023)Introduction Breast cancer is increasing in sub-Saharan Africa (SSA), and most women are diagnosed at a late stage. This leads to increased suffering for the patients and challenging care situations for nurses. Limited ... -
Characterizing the damage mechanisms of orthopedic joint prostheses
Johannessen, Anette (Master thesis, 2021)Dette prosjektet undersøkte tre brukte hofteleddsproteser med hensikt å forstå hvilke skademekanismer som var til stede og hvorfor disse oppsto. En rekke metallurgiske undersøkelser ble benyttet for å avdekke overflateka ... -
Comparison of the electrochemical behavior of amorphous Zr55Cu30Ni5Al10, stainless steel (316LVM), and CoCrMo (F75) in simulated body fluid with and without addition of protein
Tabeshian, Ali; Persson, Dan; Arnberg, Lars; Aune, Ragnhild Elizabeth (Journal article; Peer reviewed, 2018)Electrochemical behavior of, and metal ion release from the bulk amorphous (glassy) Zr55Cu30Ni5Al10 alloy (Zr‐MG) was evaluated in simulated body fluid (phosphate buffer saline [PBS]), with and without additions of protein ... -
Composition and Structure Analysis of Hard Grey Scale (HGS) Formed on Cold Surfaces Exposed to Aluminium Production Off-gas
Perez Clos, Daniel; Zedel, Hannes; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2022)Hard grey scale (HGS) is a strongly adhering fouling material forming on solid surfaces impinged by off-gas generated in the pot cells of primary aluminium production plants. Even though associated maintenance costs have ... -
Compression Testing of Ceramic Foam Filters (CFFs) Submerged in Aluminium at Operating Temperature
Bergin, Are; Fritzsch, Robert; Akhtar, Shahid; Arnberg, Lars; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2021)Particles and inclusions are commonly removed from molten aluminium with the use of Ceramic Foam Filters (CFF). The mechanical properties of CFFs are of great importance not only during transportation, storage, and mounting, ... -
Cross-Cultural Adaptation and Psychometric Properties of the Swahili Version of the European Organization for Research and Treatment of Cancer (EORTC) QLQ-BR45 among Breast Cancer Patients in Tanzania
Kidayi, Paulo L.; Pakpour, Amir H.; Saboonchi, Fredrik; Bray, Freddie Ian; Manhica, Hélio; Mtuya, Christina C.; Serventi, Furaha; Aune, Ragnhild Elizabeth; Mahande, Michael Johnson; Björling, Gunilla (Peer reviewed; Journal article, 2023)Breast cancer is the most frequent cancer in women in Africa and contributes to premature death and poor quality of life. This study aimed to determine the validity, reliability, and psychometric properties of the Swahili ... -
Effect of (5%) CO2 on the Oxidation Rate During Cooling of Industrial Aluminum White Dross
Solem, Cathrine Kyung Won; Deledda, Stefano; Zedel, Hannes; Tranell, Maria Gabriella; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2023)Aluminum (Al) white dross is classified as hazardous waste and originates from the primary production of Al as a result of molten metal oxidation at an industrial scale. As the produced dross reduces the annual metallic ... -
Enabling Efficient Heat Recovery from Aluminium Pot Gas
Clos, Daniel Perez; Andresen, Trond; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth (Chapter, 2017)In the present work, previous studies carried out by the Norwegian aluminium industry and research centres with the aim of recovering heat from aluminium production off-gas, are reviewed. The main challenge in improving ... -
Evaluation of the Effect of CO2 Cover Gas on the Rate of Oxidation of an AlMgSi Alloy
Solem, Cathrine Kyung Won; Ekstrøm, Kai Erik; Tranell, Gabriella; Aune, Ragnhild Elizabeth (Journal article, 2020)Small additions of beryllium (Be) to aluminum magnesium (AlMg) alloys have proven to decrease their oxidation rate during industrial liquid metal handling. As Be can cause respiratory health issues, it is desirable to ... -
Experimental Assessment of the Compression Strength of Conventional Ceramic Foam Filters, at Room Temperature and 730°C
Olsen, Kristoffer Smedal; Grayston, Sara Linnea Larsson (Bachelor thesis, 2020)Keramiske filtre (CFF) spiller en viktig rolle når aluminium resirkuleres på grunn av at sekundært aluminium ofte inneholder en stor mengde ikke-metalliske partikler som vil redusere de mekaniske egenskapene til produktet. ... -
Experimental Study on the Chemical Stability of Phosphate Bonded Al2O3-based Ceramic Foam Filters (CFFs)
Bergin, Are; Voigt, Claudia; Fritzsch, Robert; Akhtar, Shahid; Arnberg, Lars; Aneziris, Christos G; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2021)Production of high-quality aluminum products requires an extensive melt treatment process, even more so with the increasing focus on recycling and sustainability. Filtration is a commonly used process segment for removal ... -
Gas-Atomized Nickel Silicide Powders Alloyed with Molybdenum, Cobalt, Titanium, Boron, and Vanadium for Additive Manufacturing
Ibrahim, Mohammad; Du, Qiang; Hovig, Even Wilberg; Grasmo, Geir; Hulme, Christopher; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2023)Nickel silicides (NiSi) are renowned for their ability to withstand high temperatures and resist oxidation and corrosion in challenging environments. As a result, these alloys have garnered interest for potential applications ... -
Gjenvinning av Sjeldne Jordarter fra Elektronisk Avfall
Vinje, Berit Johansen (Master thesis, 2016)De sjeldne jordartene er en gruppe av grunnstoffer med like kjemiske egenskaper som omfatter lantanoidene og scandium og yttrium. I løpet av de siste tiårene har de blitt essensielle for moderne og grønn teknologi, men ... -
Green Ironmaking - Carburization of Green Direct Reduced Iron (DRI)
Granhei, Robert; Græsmo, Emma Victoria Vinje (Bachelor thesis, 2023)Dagens mest vanlige måte å lage jern fra jernmalm på er ved bruk av masovn, som produserer en stor mengde CO2-utslipp hvert år. Et grønnere alternativ til masovn er Direkte Reduksjon av Jern (DRI), som bruker reduksjonsgasser, ... -
Green Ironmaking – Direct Reduction of Iron Ore Pellets with Hydrogen Gas at Varying Temperature
Sivananthan, Pratheepa; Wego, Helene (Bachelor thesis, 2023)Dagens jernproduksjon (Fe) med masovner er et voksende miljøproblem, ettersom det brukes store mengder med råmaterialer som bidrar til mye CO2-utslipp. Direkte redusert jernproduksjon (DRI) med hydrogen (H2) har vekket ... -
Heat Treatment of Mg-Containing Aluminum Alloys 5182 and 6016 in an Oxidizing Atmosphere with 4% CO2
Solem, Cathrine Kyung Won; Vullum, Per Erik; Tranell, Gabriella; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2022)Oxidation of liquid aluminum (Al) during processing is a widely known problem, and magnesium (Mg), as a common alloying element, increases the oxidation rate of the alloy. It has been established that small additions of ... -
Hydraulic Characterization of Ceramic Foam Filters Used in Aluminum Filtration
Hassanabadi, Massoud; Berto, Thomas; Akhtar, Shahid; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2023)Ceramic Foam Filters (CFF) are frequently used during the filtration of aluminum (Al) melts to produce high-quality products. In the present study, the physical and hydraulic characteristics of alumina (Al2O3)-based CFF ... -
Influence of filter surface roughness on the pressure drop of ceramic foam filters
Voigt, Claudia; Werzner, Eric; Fritzsch, Karl Robert Drescher; Hubálková, Jana; Hassanabadi, Massoud; Aune, Ragnhild Elizabeth; Innocentini, Murilo D.M.; Aneziris, Christos G. (Peer reviewed; Journal article, 2023)The pressure drop of a ceramic foam filter is an important characteristic indicating the resistance to fluid flow through the filter. Filtration experiments have shown that filtration efficiency increases with decreasing ... -
Influence of Mg Concentration on the Inhibiting Effect of CO2 on the Rate of Oxidation of Aluminum Alloys 5182 and 6016
Solem, Cathrine Kyung Won; Solberg, Egil; Tranell, Gabriella; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2021)Oxidation of aluminum alloys during production is a well-known problem and contributes to significant metal losses. As small additions of CO2 in the oxidizing atmosphere has proven to inhibit the oxidation rate for ...