The origin of spectral curvature at energies $E\simeq 10$ keV in ultraluminous X-ray sources is not well understood. In this paper, we propose a novel mechanism based on synchrotron radiation to explain cutoff. We show that relativistic plasma can give rise observed for neutron star magnetic fields due the variation latitude radiation. analyze NuSTAR data two bright pulsar ULXs, NGC 5907 ULX1 a...

Discovered by Aldous, Diaconis and Shahshahani in the context of card shuffling, cutoff phenomenon has since then been established for a variety Markov chains. However, proving remains delicate affair, which requires very detailed knowledge chain. Identifying general mechanisms underlying this phase transition, without having to pinpoint its precise location, one most fundamental open problems ...

Maximally-flat (MAXFLAT) finite impulse response (FIR) filters often face a problem of the cutoff-frequency error due to approximation desired frequency by some closed-form solution. So far, there have been plenty efforts design such filter with an arbitrarily specified cut off-frequency, but this type requires extensive computation and is not MAXFLAT anymore. Thus, computationally efficient ef...

We have obtained complete redshift information for a sample of 442 radio-loud quasars with flux densities S 11 ≥ 0.25 Jy. These come from a completely-identified sample of 878 flat-spectrum radio sources, so there is no optical magnitude limit. With these quasars, therefore, we can map out the entire quasar epoch, unhindered by optical selection effects and any intervening dust. The rapid decli...