Search Results - "Clausen, Lasse"

Automatic Classification of Auroral Images From the Oslo Auroral THEMIS (OATH) Data Set Using Machine Learning by Clausen, Lasse B. N., Nickisch, Hannes

“…Based on their salient features we manually label 5,824 images from various Time History of Events and Macroscale Interactions during Substorms (THEMIS)…”
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Ionospheric Plasma Irregularities Characterized by the Swarm Satellites: Statistics at High Latitudes by Jin, Yaqi, Spicher, Andres, Xiong, Chao, Clausen, Lasse B. N., Kervalishvili, Guram, Stolle, Claudia, Miloch, Wojciech J.

“…The polar ionosphere is often characterized by irregularities and fluctuations in the plasma density. We present a statistical study of ionospheric plasma…”
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Severe and localized GNSS scintillation at the poleward edge of the nightside auroral oval during intense substorm aurora by van der Meeren, Christer, Oksavik, Kjellmar, Lorentzen, Dag A., Rietveld, Michael T., Clausen, Lasse B. N.

“…In this paper we study how GPS, GLONASS, and Galileo navigation signals are compromised by strong irregularities causing severe phase scintillation (σϕ>1) in…”
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A novel system for large-scale storage of electricity as synthetic natural gas using reversible pressurized solid oxide cells by Butera, Giacomo, Jensen, Søren Højgaard, Clausen, Lasse Røngaard

“…The ongoing reduction of greenhouse gas emissions entails increased use of intermittent renewable energy technologies such as wind and solar. This raises the…”
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Statistical study of the GNSS phase scintillation associated with two types of auroral blobs by Jin, Yaqi, Moen, Jøran I., Miloch, Wojciech J., Clausen, Lasse B. N., Oksavik, Kjellmar

“…This study surveys space weather effects on GNSS (Global Navigation Satellite System) signals in the nighttime auroral and polar cap ionosphere using…”
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Increasing carbon efficiency for DME production from wheat straw and renewable electricity – Analysis of 14 system layouts by Kofler, René, Clausen, Lasse Røngaard

“…•14 DME production plants based on wheat straw gasification were analyzed.•Wheat straw based DME production can reach carbon efficiencies of 84 %.•Two-stage…”
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Ionospheric Flow Vortex Induced by the Sudden Decrease in the Solar Wind Dynamic Pressure by Jin, Yaqi, Moen, Jøran Idar, Spicher, Andres, Liu, Jianjun, Clausen, Lasse B. N., Miloch, Wojciech J.

“…Abrupt changes in the solar wind dynamic pressure can greatly affect the Earth's magnetosphere‐ionosphere system. We present an ionospheric flow vortex in the…”
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Energy efficient thermochemical conversion of very wet biomass to biofuels by integration of steam drying, steam electrolysis and gasification by Clausen, Lasse R.

“…A novel system concept is presented for the thermochemical conversion of very wet biomasses such as sewage sludge and manure. The system integrates steam…”
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Measuring small-scale plasma irregularities in the high-latitude E- and F-regions simultaneously by Ivarsen, Magnus F., St-Maurice, Jean-Pierre, Hussey, Glenn, Spicher, Andres, Jin, Yaqi, Lozinsky, Adam, Goodwin, Lindsay V., Galeschuk, Draven, Park, Jaeheung, Clausen, Lasse B. N.

“…The ionosphere, Earth’s space environment, exhibits widespread turbulent structuring, or plasma irregularities, visualized by the auroral displays seen in…”
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Biomass gasification cogeneration – A review of state of the art technology and near future perspectives by Ahrenfeldt, Jesper, Thomsen, Tobias P., Henriksen, Ulrik, Clausen, Lasse R.

“…Biomass is a renewable resource from which a broad variety of commodities can be produced. However, the resource is scarce and must be used with care to avoid…”
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Direct Evidence for the Dissipation of Small‐Scale Ionospheric Plasma Structures by a Conductive E Region by Ivarsen, Magnus F, Jin, Yaqi, Spicher, Andres, Clausen, Lasse B N

“…The conductivity of the ionospheric E region is known to cause effective dissipation of plasma structures in the F region. We use 3.5 years of 16‐Hz sampling…”
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Techno-economic analysis of polygeneration systems based on catalytic hydropyrolysis for the production of bio-oil and fuels by Nguyen, Tuong-Van, Clausen, Lasse Røngaard

“…•Techno-economic models of polygeneration systems with catalytic hydropyrolysis are presented•The capital costs range between $180 and $620 million for a…”
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Ionospheric Plasma Fluctuations Induced by the NWC Very Low Frequency Signal Transmitter by Ivarsen, Magnus F., Park, Jaeheung, Jin, Yaqi, Clausen, Lasse B. N.

“…The Australian NWC (North West Cape) signal transmitter is known to strongly interfere with the topside ionosphere. We analyze 456 conjunctions between Swarm…”
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Maximizing biofuel production in a thermochemical biorefinery by adding electrolytic hydrogen and by integrating torrefaction with entrained flow gasification by Clausen, Lasse R.

“…In a “conventional” thermochemical biorefinery, carbon is emitted from the plant in the form of CO2 to make the synthesis gas from the gasifier suitable for…”
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Technoeconomic analysis of a methanol plant based on gasification of biomass and electrolysis of water by Clausen, Lasse R., Houbak, Niels, Elmegaard, Brian

“…Methanol production process configurations based on renewable energy sources have been designed. The processes were analyzed in the thermodynamic process…”
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Thermodynamic analysis of polygeneration systems based on catalytic hydropyrolysis for the production of bio-oil and fuels by Nguyen, Tuong-Van, Clausen, Lasse Røngaard

“…•An energy efficiency of 61% (LHV) is found for the baseline case with bio-oil production.•Energy efficiencies of 66–89% are achieved when co-producing SNG, H2…”
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Interferometric Study of Ionospheric Plasma Irregularities in Regions of Phase Scintillations and HF Backscatter by Spicher, Andres, LaBelle, James, Bonnell, John W., Roglans, Roger, Moser, Chrystal, Fuselier, Stephen A., Bounds, Scott, Clausen, Lasse B. N., Di Mare, Francesca, Feltman, Connor A., Jin, Yaqi, Kletzing, Craig, Miloch, Wojciech J., Moen, Jøran I., Oksavik, Kjellmar, Sawyer, Rhyan, Takahashi, Toru, Yeoman, Tim K.

“…We investigate the nature of small‐scale irregularities observed in the cusp by the Twin Rockets to Investigate Cusp Electrodynamics‐2 (TRICE‐2) in regions of…”
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Steepening Plasma Density Spectra in the Ionosphere: The Crucial Role Played by a Strong E‐Region by Ivarsen, Magnus F., St‐Maurice, Jean‐Pierre, Jin, Yaqi, Park, Jaeheung, Miloch, Wojciech, Spicher, Andres, Kwak, Young‐Sil, Clausen, Lasse B. N.

“…Based on the Swarm 16 Hz Advanced Plasma Density data set, and using the Swarm A satellite, we apply automatic detection of spectral breaks in seven million…”
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Solution for the future smart energy system: A polygeneration plant based on reversible solid oxide cells and biomass gasification producing either electrofuel or power by Sigurjonsson, Hafthor Ægir, Clausen, Lasse R.

“…[Display omitted] •Solution suggested in future smart energy systems built on fluctuating sources.•Polygeneration system operating in either electricity or…”
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Ionospheric Plasma Irregularities Based on In Situ Measurements From the Swarm Satellites by Jin, Yaqi, Xiong, Chao, Clausen, Lasse, Spicher, Andres, Kotova, Daria, Brask, Steffen, Kervalishvili, Guram, Stolle, Claudia, Miloch, Wojciech

“…In this study, we present global climatological distributions of ionospheric plasma irregularities based on measurements by the Swarm satellites. These first…”
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