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Sökning: WFRF:(Wolff D) > (2010-2014) > (2013)

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  • Abdo, A. A., et al. (författare)
  • The second Fermi large area telescope catalog of gamma-ray pulsars
  • 2013
  • Ingår i: Astrophysical Journal Supplement Series. - : American Astronomical Society. - 0067-0049 .- 1538-4365. ; 208:2, s. 17-
  • Tidskriftsartikel (refereegranskat)abstract
    • This catalog summarizes 117 high-confidence ≥0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half are neutron stars discovered using LAT data through periodicity searches in gamma-ray and radio data around LAT unassociated source positions. The 117 pulsars are evenly divided into three groups: millisecond pulsars, young radio-loud pulsars, and young radio-quiet pulsars. We characterize the pulse profiles and energy spectra and derive luminosities when distance information exists. Spectral analysis of the off-peak phase intervals indicates probable pulsar wind nebula emission for four pulsars, and off-peak magnetospheric emission for several young and millisecond pulsars. We compare the gamma-ray properties with those in the radio, optical, and X-ray bands. We provide flux limits for pulsars with no observed gamma-ray emission, highlighting a small number of gamma-faint, radio-loud pulsars. The large, varied gamma-ray pulsar sample constrains emission models. Fermi's selection biases complement those of radio surveys, enhancing comparisons with predicted population distributions.
  • Dahl-Jensen, D., et al. (författare)
  • Eemian interglacial reconstructed from a Greenland folded ice core
  • 2013
  • Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 493:7433, s. 489-494
  • Tidskriftsartikel (refereegranskat)abstract
    • Efforts to extract a Greenland ice core with a complete record of the Eemian interglacial (130,000 to 115,000 years ago) have until now been unsuccessful. The response of the Greenland ice sheet to the warmer-than-present climate of the Eemian has thus remained unclear. Here we present the new North Greenland Eemian Ice Drilling ('NEEM') ice core and show only a modest ice-sheet response to the strong warming in the early Eemian. We reconstructed the Eemian record from folded ice using globally homogeneous parameters known from dated Greenland and Antarctic ice-core records. On the basis of water stable isotopes, NEEM surface temperatures after the onset of the Eemian (126,000 years ago) peaked at 8 +/- 4 degrees Celsius above the mean of the past millennium, followed by a gradual cooling that was probably driven by the decreasing summer insolation. Between 128,000 and 122,000 years ago, the thickness of the northwest Greenland ice sheet decreased by 400 +/- 250 metres, reaching surface elevations 122,000 years ago of 130 +/- 300 metres lower than the present. Extensive surface melt occurred at the NEEM site during the Eemian, a phenomenon witnessed when melt layers formed again at NEEM during the exceptional heat of July 2012. With additional warming, surface melt might become more common in the future.
  • Lind, Monica P., et al. (författare)
  • Circulating levels of persistent organic pollutants are related to retrospective assessment of life-time weight change
  • 2013
  • Ingår i: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 90:3, s. 998-1004
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Persistent organic pollutants (POPs) have been suggested to be linked to obesity. We have previously shown that less-chlorinated PCBs were positively related to fat mass, while highly-chlorinated PCBs were inversely related to obesity.Objective: The aim of the present evaluation is to investigate the relationship between retrospective assessed life-time change in body weight (20-70. years) with circulating POP levels measured at age 70. years.Methods: 1016 subjects aged 70. years were investigated in the Prospective Investigation of the Vasculature in Uppsala Seniors (PIVUSs) study. 16 PCBs and 3 OC pesticides were analyzed using HRGC/HRMS. Current body weight was measured and participants self-reported their weight at age 20.Results: The average estimated weight change over 50. years was 14.4. kg. Both the sum of OC pesticide concentrations (4.3. kg more weight gain in quintile 5 vs. quintile 1, p< 0.0001) and the sum of the less-chlorinated PCBs were positively related to the estimated weight change (3.7. kg more weight gain in quintile 2 vs. quintile 1, non-linear relationship p=0.0015). In contrast, the sum of concentrations of highly-chlorinated PCBs were inversely related to estimated weight change (8.4. kg less weight gain in quintile 5 vs. quintile 1, p< 0.0001).Conclusion: High levels of OC pesticides and the less-chlorinated PCBs at age 70 were associated with a pronounced estimated weight change over the previous 50. years. However, the opposite was seen for highly-chlorinated PCBs. Differences in mode of action, toxicokinetics, non-linear relationships and reverse causation might explain these discrepancies.
  • Bellec, G., et al. (författare)
  • A social network integrated game experiment to relate tapping to speed perception and explore rhythm reproduction
  • 2013
  • Ingår i: Proceedings of the Sound and Music Computing Conference 2013. - 9783832534721 ; , s. 19-26
  • Konferensbidrag (refereegranskat)abstract
    • During recent years, games with a purpose (GWAPs) have become increasingly popular for studying human behaviour [1–4]. However, no standardised method for web-based game experiments has been proposed so far. We present here our approach comprising an extended version of the CaSimIR social game framework [5] for data collection, mini-games for tempo and rhythm tapping, and an initial analysis of the data collected so far. The game presented here is part of the Spot The Odd Song Out game, which is freely available for use on Facebook and on the Web 1 .We present the GWAP method in some detail and a preliminary analysis of data collected. We relate the tapping data to perceptual ratings obtained in previous work. The results suggest that the tapped tempo data collected in a GWAP can be used to predict perceived speed. I toned down the above statement as I understand from the results section that our data are not as good as When averagingthe rhythmic performances of a group of 10 players in the second experiment, the tapping frequency shows a pattern that corresponds to the time signature of the music played. Our experience shows that more effort in design and during runtime is required than in a traditional experiment. Our experiment is still running and available on line.
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  • Resultat 1-6 av 6

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