In this paper, we study entanglement islands and the Page curve in eternal four-dimensional Schwarzschild black hole surrounded by finite temperature conformal matter. By matter, mean matter described thermal density matrix, rather than usually considered vacuum state. We take at different temperatures calculate entropy for such a setup using s-wave approximation. As result, obtain that late ti...

introduction: non-uniformity test is essentially the only required daily qc procedure in nuclear medicine practice. noise creates statistical variation or random error in a flood image. non-uniformity on the other hand does not have statistical nature and may be regarded as systemic error. the present methods of non-uniformity calculation do not distinguish between these two types of error. the...