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Ü. Ertan M. A. Alpar M. H. Erkut K. Y. Ekşi Ş. Çalışkan 《Astrophysics and Space Science》2007,308(1-4):73-77
The anomalous X-ray pulsar 4U 0142+61 was recently detected in the mid infrared bands with the SPITZER Observatory (Wang, Chakrabarty and Kaplan: Nature 440, 772 (2006)). This observation is the first instance for a disk around an AXP. From a reanalysis of optical and infrared data, we show that the observations indicate that the disk is likely to be an active disk rather than a passive dust disk beyond the light cylinder, as proposed in the discovering paper. Furthermore, we show that the irradiated accretion disk model can also account for all the optical and infrared observations of the anomalous X-ray pulsars in the persistent state. 相似文献
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Rosati P. Basa S. Blain A. W. Bozzo E. Branchesi M. Christensen L. Ferrara A. Gomboc A. O’Brien P. T. Osborne J. P. Rossi A. Schüssler F. Spurio M. Stergioulas N. Stratta G. Amati L. Casewell S. Ciolfi R. Ghirlanda G. Grimm S. Guetta D. Harms J. Le Floc’h E. Longo F. Maggiore M. Mereghetti S. Oganesyan G. Salvaterra R. Tanvir N. R. Turriziani S. Vergani S. D. Balman S. Caruana J. Erkut M. H. Guidorzi G. Frontera F. Martin-Carrillo A. Paltani S. Porquet D. Sergijenko O. 《Experimental Astronomy》2021,52(3):407-437
Experimental Astronomy - The proposed THESEUS mission will vastly expand the capabilities to monitor the high-energy sky. It will specifically exploit large samples of gamma-ray bursts to probe the... 相似文献
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Numerous studies demonstrated the possibility of utilizing fly ash in the construction of embankments, road subgrades and
stabilization of a wide range of soils. The present investigation aims at determining the optimum fly ash (OFA) for mechanical
stabilization of expansive soils. Four different soils were tested for compaction characteristics and unconfined compressive
strength with and without the addition of fly ash to determine the OFA. The liquid limit (LL) and the fraction coarser than
425 μ (CF) of these soils range from 50 to 120 and 25 to 70%, respectively. An experimental strategy called two-factor factorial
design was adopted in the conducting experiments. LL and CF present in the soil are the two factors considered to influence
the OFA content. Factorial experimentation enables relative quantification of the effect of each factor as well as their interaction
with the OFA. The OFA was found to range from 5 to 40% depending upon the two factors. The LL and the CF were found to have
dominating influence on OFA content in that order, whereas the interaction effect of these two factors was marginal to fair.
A statistical regression model was developed for determination of the OFA in terms of the influencing factors. The validity
of the model developed was verified by conducting laboratory tests on two more soils that were not used in the development
of the model. Swell potential and swelling pressure of expansive soils were reduced to non-critical levels when treated with
OFA. 相似文献
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