[Comparative analysis of body fat measurement using two bioelectric impedance devices and three household scales (with the function of determining body composition) with dual-energy X-ray absorptiometry].

Body composition assessment is often used in clinical practice to assess and monitor nutritional status. For example, body fat mass is a predictor of metabolic diseases, and for an athlete it is a criterion of performance. "Gold standard" - the method of dual-energy X-ray absorptiometry - in contrast to bioelectrical impedance analysis, is difficult to apply in everyday clinical practice.

Electromagnetic emission from circumbinary disk of merging black holes.

In the paper a scenario of an electromagnetic response formation from the merging of two black holes is considered. In this scenario it's assumed that the binary black hole is surrounded by an accretion disk. As a result of the black holes merging and mass loss, the accretion disk experiences a disturbance, which is accompanied by shock waves propagation of sufficiently high intensity.