The apparent angular size of the shadow a black hole in an expanding Universe is redshift-dependent. Since cosmological redshifts change with time - known as redshift drift all redshift-dependent quantities acquire time-dependence, and fortiori so do shadows. We find mathematical description show that amplitude this effect order $10^{-16}$ per day for M87$^{\star}$. While small, we argue its no...

Rotational atherectomy (RA) for heavily calcified lesions is essential for improved stent delivery and stent expansion. In tortuous vessels it is often difficult to advance the burr without rotation and possible injury to the endothelium of healthy vessel. The GuideLiner catheter, a child in mother catheter, has recently been used to allow for increased support for delivery of stents through to...

Rotational cryptanalysis is a statistical method for attacking ARX constructions. It was previously shown that ARX-C, i.e., ARX with the injection of constants can be used to implement any function. In this paper we investigate how rotational cryptanalysis is affected when constants are injected into the state. We introduce the notion of an RX-difference, generalizing the idea of a rotational d...

background and objective: parkinson’s disease (pd) is a rather common neurological disorder in elders that is due to degeneration of dopaminergic neurons within mesencephalic substantia nigra pars compacta. with regard to protective and antioxidant effect of simvastatin, this study was conducted to evaluate its neuroprotective effect in an experimental model of pd. materials and methods: in thi...

purpose: to evaluate and compare the results of different surgical methods for post-trabeculectomy bleb revision at labbafinejad medical center, tehran-iran, from 1999 to 2003. methods: this study was conducted on all patients who underwent post-trabeculectomy bleb revision due to hypotony [intraocular pressure (iop) less than 6 mmhg] or bleb leakage. surgical methods were: conjunctival advance...