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Bi<sub>2</sub>Sr<sub>2-x</sub>Yb<sub>x</sub>CaCu<sub>2</sub>O<sub>8</sub>+O<sub>8+&#x03B4;</sub> (x = 0.00, 0.05, 0.10, and 0.20) single crystals with Yb substitution at the Sr sites are successfully obtained by the self-flux method. The single crystal with doping content x = 0.01 exhibits the highest critical temperature (T<sub>c</sub>) and critical(More)
Beaming of relativistic ejecta in GRBs has been postulated by many authors in order to reduce the total GRB energy, thus it is very important to look for the observational evidence of beaming. Rhoads (1999) has pointed out that the dynamics of the blast wave, which is formed when the beamed ejecta sweeping the external medium, will be significantly modified(More)
Sharp breaks have been observed in the afterglow light curves of several GRBs; this is generally explained by the jet model. However, there are still some uncertainties concerning this interpretation due to the unclear hydrodynamics of jet sideways expansion. Here we propose an alternative explanation to these observed breaks. If we assume that the(More)
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