Fakultet for naturvitenskap og teknologi: Nye registreringer

Viser treff 3021-3040 av 5433

    • Measurement of inner wall limiter SOL widths in KSTAR tokamak 

      Bak, J. G.; Pitts, RA; Kim, HS; Lee, H; Bin, C.; Juhn, JW; Hong, SH; Garcia, Odd Erik; Kube, Ralph Arthur; Seo, DC (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-27)
      Scrape-off layer (SOL) widths <i>λ<sub>q</sub></i> are presented from the KSTAR tokamak using fast reciprocating Langmuir probe assembly (FRLPA) measurements at the outboard mid-plane (OMP) and the infra-Red (IR) thermography at inboard limiter tiles in moderately elongated (<i>κ</i> = 1.45 – 1.55) L-mode inner wall-limited (IWL) plasmas under experimental conditions such as B<sub>T</sub> = 2.0 T, ...

    • SOL width and intermittent fluctuations in KSTAR 

      Garcia, Odd Erik; Kube, Ralph Arthur; Theodorsen, Audun; Bak, J. G.; Hong, SH; Kim, H.S.; KSTAR, project team; Pitts, RA (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-27)
      Radial profiles of the ion saturation current and its fluctuation statistics are presented from probe measurements in L-mode, neutral beam heated plasmas at the outboard mid-plane region of KSTAR. The results are consistent with the familiar two-layer structure, seen elsewhere in tokamak L-mode discharges, with a steep near-SOL profile and a broad far-SOL profile. The profile scale length in the ...

    • Surface mass balance and stable oxygen isotope ratios from shallow firn cores on Fimbulisen, East Antarctica 

      Schlosser, E; Anschütz, Helgard; Isaksson, E.; Martma, T; Divine, Dmitry V; Nøst, O.-A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      The mass balance of Antarctica is one of the crucial factors for determining sea-level change in a warming climate. The marginal zones of the continent, namely the ice shelves, are most sensitive to climate change. During the 2009/10 austral summer an extensive glaciological field campaign was carried out on Fimbulisen, an ice shelf in East Antarctica, to investigate its recent surface mass balance. ...

    • The quantitative level of T315I mutated BCR-ABL predicts for major molecular response to second-line nilotinib or dasatinib treatment in patients with chronic myeloid leukemia 

      Lange, Thoralf; Ernst, Thomas; Gruber, Franz; Maier, Jacqueline; Cross, Michael; Müller, Martin C.; Niederwieser, Dietger; Hochhaus, Andreas; Pfirrmann, Markus (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-05)
      The BCR-ABL T315I mutation causes resistance to imatinib, nilotinib and dasatinib in chronic myeloid leukemia. Forty BCR-ABL positive patients with imatinib resistance were analyzed for T315I mutated clones after six months on nilotinib or dasatinib treatment by quantitative allele-specific ligation polymerase chain reaction with a sensitivity of 0.05%. Ligation polymerase chain reaction revealed ...

    • Airmanship - A qualitative approach 

      Nergård, Vegard (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-10)
      The purpose of this study was to investigate how pilots themselves characterize a good pilot and airmanship, and how safety is created by the practice of knowledge. The purpose of this study was to get the insiders’ understanding of the concept of airmanship. Results indicate that the formulation of the concept of airmanship is complex, and it is first and foremost comprised of the knowledge about ...

    • One-Year Analysis of Dust Impact-Like Events Onto the MMS Spacecraft 

      Vaverka, Jakub; Pavlu, Jiri; Nouzak, Libor; Safrankova, Jana; Nemecek, Zdenek; Mann, Ingrid; Ye, Shengyi; Lindqvist, Per-Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-16)
      We present an analysis of 1‐year data of dust impacts observed on two of the Earth‐orbiting Magnetospheric Multiscale mission (MMS) spacecraft. The dust impact signals were identified in observations of the electric field probes and were registered simultaneously by monopole and dipole configurations of the instrument. This unique setup allows us to reliably identify changes in the spacecraft potential ...

    • Learning from experience 

      Nergård, Vegard (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-14)
      The purpose of this study was to explore how pilots potentially learn from their and others‘ experience through post-flight debriefing. Through a case study of pilots who fly air ambulances, this article attempts to illustrate the importance of learning from experience (Bion 1962) among pilots in aviation.

    • Baseline undersøkelse av studiekvalitet og undervisningskultur på Institutt for geovitenskap ved UiT Norges arktiske universitet 

      Martens, Iver; Malm, Rie Hjørnegaard (Research report; Forskningsrapport, 2019-04)
      Institutt for geovitenskap ved UiT Norges arktiske universitet ønsker å gjøre en innsats for å forbedre undervisningen ved instituttet. Instituttet tilbyr utdanninger på bachelor-, master- og doktorgradsnivå, med 12 bachelorkurs, 28 masterkurs og 9 kurs på doktorgradsnivå. Dette prosjektet fokuserer på undervisningskvaliteten på bachelor- og master utdanningen. Vi håper rapporten kan bidra til ...

    • Engineering low-temperature expression systems for heterologous production of cold-adapted enzymes 

      Bjerga, Gro Elin Kjæreng; Lale, Rahmi; Williamson, Adele Kim (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-26)
      Production of psychrophilic enzymes in the commonly used mesophilic expression systems is hampered by low intrinsic stability of the recombinant enzymes at the optimal host growth temperatures. Unless strategies for low-temperature expression are advanced, research on psychrophilic enzymes may end up being biased toward those that can be stably produced in commonly used mesophilic host systems. Two ...

    • Late Weichselian and Holocene palaeoceanography of Storfjordrenna, southern Svalbard 

      Lacka, M.; Zajaczkowski, M.; Forwick, Matthias; Szczucinski, W. (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-03-27)
      Multiproxy analyses (including benthic and planktonic foraminifera, δ<sup>18</sup>O and δ<sup>13</sup>C records, grain-size distribution, ice-rafted debris, XRF geochemistry and magnetic susceptibility) were performed on a <sup>14</sup>C-dated marine sediment core from Storfjordrenna, located off of southern Svalbard. The sediments in the core cover the termination of Bølling–Allerød, the Younger ...

    • Novel secure VPN architectures for LTE backhaul networks 

      Liyanage, Madhusanka; Kumar, Pradeep; Ylianttila, Mika; Gurtov, Andrei (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-11)
      In this paper, we propose two secure virtual private network architectures for the long‐term evolution backhaul network. They are layer 3 Internet protocol (IP) security virtual private network architectures based on Internet key exchange version 2 mobility and multihoming protocol and host identity protocol. Both architectures satisfy a complete set of 3GPP backhaul security requirements such as ...

    • The Distribution of Heavy Metals in the Sediment of Low Tidal Flat, Eastern Chongming Island, China 

      Lu, Jinmei; Yuan, Fuqing (Journal article; Tidsskriftartikkel; Peer reviewed, 2019)
      The distribution of heavy metals in the tidal flat is of great significance on the estuary environment. This study aims to find the heavy metal distribution mechanism at low tidal flat in Yangtze Estuary, China. 4 sediment cores were collected at low tidal flat of eastern Chongming Island at four seasons spring, summer, autumn and winter. The concentrations of element Al, Cu, Cr, Fe, Mn, Pb, Rb, Zn, ...

    • Exploring the teaching environment in a higher education geoscience programme 

      Malm, Rie Hjørnegaard; Martens, Iver (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-19)
      This paper explores the teaching environment among the teaching staff in thegeoscience programme at UiT The Arctic University of Norway. The findings in this paper are based on a large baseline study conducted in 2018. This paper operationalises the teaching culture by analysing the teachers’ ideas, collaborations, and attitudes towards teaching. In-depth interviews ...

    • Geochemistry of rutile-bearing veins at Engebøfjellet, Naustdal, Norway. 

      Grane, Kristoffer (Master thesis; Mastergradsoppgave, 2018-11-15)
      The Engebøfjellet eclogite, located in Naustdal, Norway, contain quartz veins with large rutile (TiO2) phenocrystals. Trace element composition of rutile deposited in veins and in the eclogite matrix was analysed with the use of LA-ICP-MS. The Nb content decrease with increasing V in the rutile, and contents of these elements vary depending on depositional environment. One quartz vein associated ...

    • Microwave-assisted synthesis of heterocycles from aryldiazoacetates. 

      Kristoffersen, Tone (Master thesis; Mastergradsoppgave, 2017-11-15)
      A novel microwave-assisted method for generation of heterocycles have been explored. A range of 3,4 dihydroquinoxalin-2-ones have been prepared via an N-H insertion/cyclization cascade of dinucleophiles and aryldiazoacetates in moderate to good yields (12 - 80%). Reactions of aryldiazoacetates with o-phenylenediamine generated the best yields, while reactions with aliphatic and benzylic dinucleophiles ...

    • Winter storms accelerate the demise of sea ice in the Atlantic sector of the Arctic Ocean 

      Graham, Robert M.; Itkin, Polona; Meyer, Amelie; Sundfjord, Arild; Spreen, Gunnar; Smedsrud, Lars H.; Liston, Glen E.; Cheng, Bin; Cohen, Lana; Divine, Dmitry; Fer, Ilker; Fransson, Agneta; Gerland, Sebastian; Haapala, Jari; Hudson, Stephen R.; Johansson, Malin; King, Jennifer A.; Merkouriadi, Ioanna; Peterson, Algot Kristoffer; Provost, Christine; Randelhoff, Achim; Rinke, Annette; Rösel, Anja; Sennechael, Nathalie; Walden, Von P.; Duarte, Pedro; Assmy, Philipp; Steen, Harald; Granskog, Mats A. (Journal article; Peer reviewed, 2019-06-25)
      A large retreat of sea-ice in the ‘stormy’ Atlantic Sector of the Arctic Ocean has become evident through a series of record minima for the winter maximum sea-ice extent since 2015. Results from the Norwegian young sea ICE (N-ICE2015) expedition, a five-month-long (Jan-Jun) drifting ice station in first and second year pack-ice north of Svalbard, showcase how sea-ice in this region is frequently ...

    • Recent advances in hyperspectral imaging for melanoma detection 

      Johansen, Thomas Haugland; Møllersen, Kajsa; Ortega, Samuel; Fabelo, Himar; Garcia, Aday; Callico, Gustavo; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-22)
      Skin cancer is one of the most common types of cancer. Skin cancers are classified as nonmelanoma and melanoma, with the first type being the most frequent and the second type being the most deadly. The key to effective treatment of skin cancer is early detection. With the recent increase of computational power, the number of algorithms to detect and classify skin lesions has increased. The overall ...

    • Geochemistry of sediment-hosted copper deposits and their environmental impact: A case study from the Nussir and Ulveryggen deposits, Repparfjord Tectonic Window, Northern Norway 

      Mun, Yulia (Doctoral thesis; Doktorgradsavhandling, 2019-11-07)
      Modern growing economy and technology require metals. Therefore mining is an unavoidable process. Mining in its turn results in the production of large amounts of mine waste. This research is focused on one type of mine waste, mine tailings, formed after the processing of Cu-sulphides deposits. Acid mine drainage (AMD) is a consequence of the oxidation of sulphide-rich rocks and has a drastic impact ...

    • Caesium Fluoride-Mediated Hydrocarboxylation of Alkenes and Allenes: Scope and Mechanistic Insights 

      Gevorgyan, Ashot; Obst, Marc; Guttormsen, Yngve; Maseras, Feliu; Hopmann, Kathrin Helen; Bayer, Annette (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-11)
      A caesium fluoride-mediated hydrocarboxylation of olefins is disclosed that does not rely on precious transition metal catalysts and ligands. The reaction occurs at atmospheric pressures of CO<sub>2</sub> in the presence of 9-BBN as a stoichiometric reductant. Stilbenes, β-substituted styrenes and allenes could be carboxylated in good yields. The developed methodology can be used for preparation of ...

    • On-chip optical nanoscopy: towards high throughput and multi-modality 

      Helle, Øystein Ivar (Doctoral thesis; Doktorgradsavhandling, 2019-11-07)
      Super-resolution microscopy techniques improve the resolution of the optical microscope beyond the diffraction limit of light. A range of different techniques demands different optical configurations and clever illuminating strategies to enhance the resolution. This has led to the development of advanced instrumentation, where the super-resolution mechanisms are adding both cost and bulk to the ...