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Träfflista för sökning "WFRF:(David G) srt2:(2020-2024)"

Search: WFRF:(David G) > (2020-2024)

  • Result 1-10 of 1398
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1.
  • Murari, A., et al. (author)
  • A control oriented strategy of disruption prediction to avoid the configuration collapse of tokamak reactors
  • 2024
  • In: Nature Communications. - 2041-1723 .- 2041-1723. ; 15:1
  • Journal article (peer-reviewed)abstract
    • The objective of thermonuclear fusion consists of producing electricity from the coalescence of light nuclei in high temperature plasmas. The most promising route to fusion envisages the confinement of such plasmas with magnetic fields, whose most studied configuration is the tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one of the main potential showstoppers on the route to a commercial reactor. In this work we report how, deploying innovative analysis methods on thousands of JET experiments covering the isotopic compositions from hydrogen to full tritium and including the major D-T campaign, the nature of the various forms of collapse is investigated in all phases of the discharges. An original approach to proximity detection has been developed, which allows determining both the probability of and the time interval remaining before an incoming disruption, with adaptive, from scratch, real time compatible techniques. The results indicate that physics based prediction and control tools can be developed, to deploy realistic strategies of disruption avoidance and prevention, meeting the requirements of the next generation of devices.
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2.
  • Niemi, MEK, et al. (author)
  • 2021
  • swepub:Mat__t
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  • Kanai, M, et al. (author)
  • 2023
  • swepub:Mat__t
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  • Algaba, Juan-Carlos, et al. (author)
  • Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
  • 2021
  • In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 911:1
  • Research review (peer-reviewed)abstract
    • In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting supermassive black hole of mass ∼6.5 × 109 M o˙. The EHTC also partnered with several international facilities in space and on the ground, to arrange an extensive, quasi-simultaneous multi-wavelength campaign. This Letter presents the results and analysis of this campaign, as well as the multi-wavelength data as a legacy data repository. We captured M87 in a historically low state, and the core flux dominates over HST-1 at high energies, making it possible to combine core flux constraints with the more spatially precise very long baseline interferometry data. We present the most complete simultaneous multi-wavelength spectrum of the active nucleus to date, and discuss the complexity and caveats of combining data from different spatial scales into one broadband spectrum. We apply two heuristic, isotropic leptonic single-zone models to provide insight into the basic source properties, but conclude that a structured jet is necessary to explain M87's spectrum. We can exclude that the simultaneous γ-ray emission is produced via inverse Compton emission in the same region producing the EHT mm-band emission, and further conclude that the γ-rays can only be produced in the inner jets (inward of HST-1) if there are strongly particle-dominated regions. Direct synchrotron emission from accelerated protons and secondaries cannot yet be excluded.
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9.
  • Lindegren, Lennart, et al. (author)
  • Gaia Early Data Release 3 : The Gaia Catalogue of Nearby Stars
  • 2021
  • In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 649
  • Journal article (peer-reviewed)abstract
    • Aims. We produce a clean and well-characterised catalogue of objects within 100 pc of the Sun from the Gaia Early Data Release 3. We characterise the catalogue through comparisons to the full data release, external catalogues, and simulations. We carry out a first analysis of the science that is possible with this sample to demonstrate its potential and best practices for its use.Methods. Theselection of objects within 100 pc from the full catalogue used selected training sets, machine-learning procedures, astrometric quantities, and solution quality indicators to determine a probability that the astrometric solution is reliable. The training set construction exploited the astrometric data, quality flags, and external photometry. For all candidates we calculated distance posterior probability densities using Bayesian procedures and mock catalogues to define priors. Any object with reliable astrometry and a non-zero probability of being within 100 pc is included in the catalogue.Results. We have produced a catalogue of 331 312 objects that we estimate contains at least 92% of stars of stellar type M9 within 100 pc of the Sun. We estimate that 9% of the stars in this catalogue probably lie outside 100 pc, but when the distance probability function is used, a correct treatment of this contamination is possible. We produced luminosity functions with a high signal-to-noise ratio for the main-sequence stars, giants, and white dwarfs. We examined in detail the Hyades cluster, the white dwarf population, and wide-binary systems and produced candidate lists for all three samples. We detected local manifestations of several streams, superclusters, and halo objects, in which we identified 12 members of Gaia Enceladus. We present the first direct parallaxes of five objects in multiple systems within 10 pc of the Sun.Conclusions. We provide the community with a large, well-characterised catalogue of objects in the solar neighbourhood. This is a primary benchmark for measuring and understanding fundamental parameters and descriptive functions in astronomy.
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  • Result 1-10 of 1398
Type of publication
journal article (1286)
research review (72)
conference paper (19)
book chapter (7)
other publication (4)
reports (3)
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doctoral thesis (3)
editorial collection (1)
book (1)
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Type of content
peer-reviewed (1358)
other academic/artistic (37)
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Author/Editor
Zwalinski, L. (302)
Strandberg, Jonas (294)
Ripellino, Giulia (292)
Brenner, Richard (290)
Ekelöf, Tord (286)
Ellert, Mattias (282)
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Bergeås Kuutmann, El ... (282)
Ferrari, Arnaud, 197 ... (282)
Ellajosyula, Venugop ... (252)
Asimakopoulou, Eleni ... (234)
Aad, G (222)
Gonzalez Suarez, Reb ... (204)
Lund-Jensen, Bengt (199)
Milstead, David A. (176)
Backman, Filip, 1991 ... (170)
Moa, Torbjörn (168)
Valdés Santurio, Edu ... (168)
Hellman, Sten (168)
Sjölin, Jörgen (168)
Clement, Christophe (166)
Pereira Sanchez, Lau ... (164)
Andrean, Stefio Y., ... (163)
Bohm, Christian, 194 ... (163)
Barranco Navarro, La ... (162)
Mathisen, Thomas (157)
Shaheen, Rabia (156)
Silverstein, Samuel ... (155)
Pasuwan, Patrawan, 1 ... (150)
Sunneborn Gudnadotti ... (145)
Lundberg, Olof (143)
Shope, David R. (141)
Lytken, E. (132)
Milstead, David A., ... (132)
Hedberg, V. (131)
Konya, B. (131)
Poettgen, R. (131)
Smirnova, O. (131)
Barranco Navarro, La ... (130)
Hellman, Sten, 1956- (130)
Sjölin, Jörgen, 1968 ... (130)
Clément, Christophe, ... (129)
Silverstein, Samuel ... (129)
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Shaikh, Nabila W. (128)
Lou, Xuanhong, 1995- (125)
Bohm, Christian (124)
Dunne, Katherine, 19 ... (123)
Ingebretsen Carlson, ... (123)
Strandberg, Sara, 19 ... (123)
Backman, Filip (123)
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University
Uppsala University (557)
Lund University (511)
Stockholm University (441)
Royal Institute of Technology (339)
Karolinska Institutet (212)
Chalmers University of Technology (141)
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University of Gothenburg (138)
Umeå University (126)
Linköping University (72)
Örebro University (40)
Luleå University of Technology (35)
Swedish University of Agricultural Sciences (29)
Swedish Museum of Natural History (13)
University of Skövde (12)
Linnaeus University (12)
Mid Sweden University (10)
Malmö University (9)
Stockholm School of Economics (9)
Jönköping University (7)
Högskolan Dalarna (7)
Kristianstad University College (4)
University of Gävle (4)
University West (2)
Karlstad University (2)
IVL Swedish Environmental Research Institute (2)
Halmstad University (1)
Mälardalen University (1)
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Royal College of Music (1)
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Language
English (1395)
Russian (3)
Research subject (UKÄ/SCB)
Natural sciences (806)
Medical and Health Sciences (508)
Engineering and Technology (84)
Social Sciences (52)
Agricultural Sciences (27)
Humanities (10)

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