Viser treff 2321-2340 av 5336

    • A Possible Explanation of Interhemispheric Asymmetry of Equatorial Plasma Bubbles in Airglow Images 

      Hickey, Dustin A.; Sau, Sukanta; Narayanan, Viswanathan Lakshmi; Gurubaran, S. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-28)
      Equatorial plasma bubbles resulting from equatorial spread urn:x-wiley:jgra:media:jgra55597:jgra55597-math-0002 are well known to be aligned along the Earth's geomagnetic fields. During the geomagnetic storm on 17 March 2015, all‐sky airglow observations from Tirunelveli (8.7°N, 77.8°E, 1.7°N dip latitude) showed an apparent interhemispheric asymmetry in the tilt of the equatorial plasma bubbles. ...
    • Learning from crisis: the 2015 and 2017 avalanches in Longyearbyen 

      Sydnes, Are K.; Sydnes, Maria; Hamnevoll, Helle (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-27)
      Longyearbyen has been hit by two avalanches in 2015 and 2017 causing severe damages to housing and two fatalities. In this study we investigate organised learning processes regarding emergency preparedness and response following the avalanches. Longyearbyen provides a case of particular interest as climatic change rapidly is altering the environmental conditions, including the risk of avalanches.< ...
    • Renewable Solvents for Palladium-Catalyzed Carbonylation Reactions 

      Ismael, Aya; Gevorgyan, Ashot; Skrydstrup, Troels; Bayer, Annette (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-04)
      Solvents constitute the largest component for many chemical processes and substitution of nonrenewable solvents is a longstanding goal for green chemistry. Here, we show that Pd-catalyzed carbonylative couplings, such as carbonylative cross-couplings, aminocarbonylations, and alkoxycarbonylations, can be successfully realized using renewable solvents. The present research covers not only well-established ...
    • Radar System Development for Drone Borne Applications with Focus on Snowpack Parameters 

      Jenssen, Rolf-Ole Rydeng (Doctoral thesis; Doktorgradsavhandling, 2021-05-11)
      A complete representation of the Arctic cryosphere has historically been restricted by its remoteness, large extent, and restrictions in measurement methods and equipment. Here, remote sensing of snow-cover is a central method to improve the current knowledge of the Earth's ecosystem, and hence a critical component in cryospheric models. The use of drone-borne radar systems has seen considerable ...
    • General recurrence-relation generation scheme for molecular integral evaluation 

      Gao, Bin (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)
      We develop a new scheme for evaluating different molecular integrals using Gaussian type orbitals. In this new scheme, the evaluation of integrals is performed in two steps during runtime. The first step is a top-down procedure that maps each recurrence relation into a jagged array (array of arrays), where each element of a member array represents either the final results or some intermediate integrals ...
    • Effects of fecal microbiota transplantation in subjects with irritable bowel syndrome are mirrored by changes in gut microbiome 

      Goll, Rasmus; Johnsen, Peter Holger; Hjerde, Erik; Diab, Joseph; Valle, Per Christian; Hilpüsch, Frank; Cavanagh, Jorunn Pauline (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-29)
      Irritable bowel syndrome (IBS) is a common disorder of the lower gastrointestinal tract. The pathophysiology is far from settled, but a gut microbial dysbiosis is hypothesized to be a contributing factor. We earlier published a randomized double-blind placebo-controlled clinical trial on fecal microbiota transplantation (FMT) for IBS – the REFIT trial. The present data set describes the engraftment ...
    • Integrating Incidence Angle Dependencies Into the Clustering-Based Segmentation of SAR Images 

      Cristea, Anca; Van Houtte, Jeroen; Doulgeris, Anthony Paul (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-28)
      Synthetic aperture radar systems perform signal acquisition under varying incidence angles and register an implicit intensity decay from near to far range. Owing to the geometrical interaction between microwaves and the imaged targets, the rates at which intensities decay depend on the nature of the targets, thus rendering single-rate image correction approaches only partially successful. The decay, ...
    • Effectiveness of Fluorescent Viability Assays in Studies of Arctic Cold Seep Foraminifera 

      Melaniuk, Katarzyna (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-09)
      Highly negative δ<sup>13</sup>C values in fossil foraminifera from methane cold seeps have been proposed to reflect episodes of methane release from gas hydrate dissociation or free gas reservoirs triggered by climatic changes in the past. Because most studies on live foraminifera are based on the presence of Rose Bengal staining, that colors the cytoplasm of both live and recently dead individuals ...
    • Cenozoic uplift and erosion of the Norwegian Barents Shelf – A review 

      Lasabuda, Amando Putra Ersaid; Johansen, Nora; Laberg, Jan Sverre; Faleide, Jan Inge; Senger, Kim; Rydningen, Tom Arne; Patton, Henry; Knutsen, Stig-Morten; Hanssen, Alfred (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-23)
      Uplift and erosion are complex phenomena in terms of their governing processes, precise timing and exact magnitude. The intricate relationship between different geodynamic processes leading to uplift may increase uncertainties in estimating spatial and temporal patterns. Sediment distribution from uplifted (and eroded) topography and the corresponding paleoenvironmental reconstructions require ...
    • Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin 

      Hong, Wei-Li; Pape, T; Schmidt, C.; Yao, Haoyi; Wallmann, K.; Plaza-Faverola, Andreia; Rae, J.W.B; Lepland, Aivo; Bünz, Stefan; Bohrmann, G. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-11)
      Seafloor seepage sites along the Vestnesa Ridge off west-Svalbard have been, for decades, a natural laboratory for the studies of fluid flow and gas hydrate dynamics at passive continental margins. The lack of ground truth evidence for fluid composition and gas hydrate abundance deep in the sediment sequence however prohibits us from further assessing the current model of pockmark evolution from the ...
    • Younger Dryas ice margin retreat in Greenland: new evidence from southwestern Greenland 

      Funder, Svend; Sørensen, Anita H. L.; Larsen, Nicolaj K.; Bjørk, Anders A.; Briner, Jason P.; Olsen, Jesper; Schomacker, Anders; Levy, Laura B.; Kjær, Kurt H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-04)
      To date the final stage in deglaciation of the Greenland shelf, when a contiguous ice sheet margin on the inner shelf transitioned to outlet glaciers in troughs with intervening ice-free areas, we generated cosmogenic <sup>10</sup>Be dates from bedrock knobs on six outlying islands along a stretch of 300 km of the southwestern Greenland coast. Despite <sup>10</sup>Be inheritance influencing some ...
    • Integration of solar latent heat storage towards optimal small-scale combined heat and power generation by Organic Rankine Cycle 

      Lizana, Jesus; Bordin, Chiara; Rajabloo, Talieh (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-16)
      Thermal energy and distributed electricity demand are continuously increased in areas poorly served by a centralized power grid. In many cases, the deployment of the electricity grid is not economically feasible. Small-scale Organic Rankine Cycle (ORC) appears as a promising technology that can be operated by solar energy, providing combined heat and power (CHP) generation. Additionally, thermal ...
    • Millennial‐scale changes in bottom water temperature and water mass exchange through the Fram Strait 79ºN, 63–13 ka 

      El Bani Altuna, Naima; Ezat, Mohamed; Greaves, M.; Rasmussen, Tine Lander (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-31)
      The Svalbard margin, in the eastern Fram Strait with its high sediment accumulation, form a key area for the reconstruction of water mass and heat exchange between the North Atlantic and Arctic Ocean in relation to abrupt climate changes as seen in glacial Greenland Interstadial and Greenland Stadial (GI‐GS) events. Here, we present a bottom water temperature (BWT) record from the northern Nordic ...
    • Two SnRK2-Interacting Calcium Sensor Isoforms Negatively Regulate SnRK2 Activity by Different Mechanisms 

      Tarnowski, Krzysztof; Klimecka, Maria; Ciesielski, Arkadiusz; Goch, Grazyna; Kulik, Anna; Fedak, Halina; Poznanski, Jaroslaw; Lichocka, Malgorzata; Pierechod, Marcin Miroslaw; Engh, Richard Alan; Dadlez, Michal; Dobrowolska, Grazyna; Bucholc, Maria (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-07)
      SNF1-related protein kinases 2 (SnRK2s) are key signaling elements regulating abscisic acid-dependent plant development and responses to environmental stresses. Our previous data showed that the SnRK2-interacting Calcium Sensor (SCS) inhibits SnRK2 activity. Use of alternative transcription start sites located within the Arabidopsis (Arabidopsis thaliana) AtSCS gene results in two in-frame transcripts ...
    • Necessary Conditions for Warm Inflow Toward the Filchner Ice Shelf, Weddell Sea 

      Daae, Kjersti; Hattermann, Tore; Darelius, Elin Maria K.; Mueller, Rachael D.; Naughten, Kaitlin A; Timmermann, Ralph; Hellmer, Hartmut H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-09)
      Understanding changes in Antarctic ice shelf basal melting is a major challenge for predicting future sea level. Currently, warm Circumpolar Deep Water surrounding Antarctica has limited access to the Weddell Sea continental shelf; consequently, melt rates at Filchner‐Ronne Ice Shelf are low. However, large‐scale model projections suggest that changes to the Antarctic Slope Front and the coastal ...
    • Visualizing ultrastructural details of placental tissue with super-resolution structured illumination microscopy 

      Villegas Hernandez, Luis Enrique; Nystad, Mona; Ströhl, Florian; Basnet, Purusotam; Acharya, Ganesh; Ahluwalia, Balpreet Singh (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-14)
      Super-resolution fluorescence microscopy is a widely employed technique in cell biology research, yet remains relatively unexplored in the field of histopathology. Here, we describe the sample preparation steps and acquisition parameters necessary to obtain fluorescent multicolor super-resolution structured illumination microscopy (SIM) images of both formalin-fixed paraffin-embedded and cryo-preserved ...
    • Machine Learning for Enhanced Maritime Situation Awareness: Leveraging Historical AIS Data for Ship Trajectory Prediction 

      Murray, Brian (Doctoral thesis; Doktorgradsavhandling, 2021-05-03)
      In this thesis, methods to support high level situation awareness in ship navigators through appropriate automation are investigated. Situation awareness relates to the perception of the environment (level 1), comprehension of the situation (level 2), and projection of future dynamics (level 3). Ship navigators likely conduct mental simulations of future ship traffic (level 3 projections), that ...
    • Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials 

      Dessandier, Pierre-Antoine; Knies, Jochen; Plaza-Faverola, Andreia; Labrousse, C.; Renoult, M.; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-22)
      Circum-Arctic glacial ice is melting in an unprecedented mode, and release of currently trapped geological methane may act as a positive feedback on ice-sheet retreat during global warming. Evidence for methane release during the penultimate (Eemian, ca. 125 ka) interglacial, a period with less glacial sea ice and higher temperatures than today, is currently absent. Here, we argue that based on ...
    • Autochthonous origin of the Encruzilhada Block, Dom Feliciano Belt, southern Brazil, based on aerogeophysics, image analysis and PT-paths 

      De Toni, Giuseppe Betino; Bitencourt, Maria de Fatima; Konopásek, Jiří; Battisti, Matheus Ariel; da Costa, Elisa Oliveira; Savian, Jairo Francisco (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-04)
      The Encruzilhada Block lies between the eastern hinterland and western foreland of the Dom Feliciano Belt (southern Brazil) and its tectonic meaning in the orogenic evolution of the belt is still poorly understood. Its low magnetic signal is similar to that of the foreland supracrustal sequences, whereas the high gammaspectrometric signal appears due to the hinterland post-collisional granitoids. ...
    • The Plio-Pleistocene seepage history off western Svalbard inferred from 3D petroleum systems modelling 

      Daszinnies, Matthias Christian; Plaza-Faverola, Andreia; Sylta, Øyvind; Bünz, Stefan; Mattingsdal, Rune; Tømmerås, Are; Knies, Jochen (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-05)
      Methane seepage off the coast of Svalbard is demonstrated by active gas flares in the water column today and through precipitation of methane-derived authigenic carbonates (MDAC) over the past 160 000 years. Though submarine discharge of thermogenic methane is well documented, the geological history of past leakage is still debated, largely due to unconstrained free gas sources and seepage trigger ...