نتایج جستجو برای: break through curve
تعداد نتایج: 1500322 فیلتر نتایج به سال:
In September 2009, we released a set of concrete, feasible steps that could achieve the goal of significantly slowing spending growth while improving the quality of care. We stand by these recommendations, but they need to be updated in light of the new Patient Protection and Affordable Care Act (ACA). Reducing healthcare spending growth remains an urgent and unresolved issue, especially as the...
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 by the sideways expansion due to the ...
Although the Boneh and Franklin identity-based encryption scheme is not overly complex theoretically, the implementation of the system proves to be somewhat difficult. 1 Identity Based Encryption: The difficulty with public key encryption involves distribution of the keys and the assumption that they will always be available (Ding 194). It is not always practical to be connected to a key certif...
The most luminous GRBs can be explained in terms of models involving stellar mass central engines only if the ejecta are beamed. As was pointed out by Rhoads (1997), the dynamics of the blast wave, formed by the beamed ejecta sweeping the external gas, can be significantly modified by the sideways expansion. This is because in this case the surface of the blast wave increases faster than just d...
We derive a relation between the flux density Fν, j at the light-curve break of a gamma-ray burst (GRB) afterglow and the break time t j. The break is due to the transition from the spherical-like to jet-like evolution of the afterglow, when the Lorentz factor of the jet equals the inverse of the initial half-opening angle, i.e., γ = 1/θ0. We show that this relation indeed behaves as Fν, j ∝ t ...
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