Exact solutions for magnetized black holes

The Ernst-Wild solution with conical singularities removed is discussed. The physical quantities characterizing the modified solution including electromagnetic four-potential, electric, and magnetic field fluxes through the upper hemisphere of the horizon, equatorial and meridional circumferences on the horizon are calculated.     

Negative absorption near a magnetized black hole: Black hole masers

The mechanism of the energy extraction from charged particles moving in the vicinity of black holes due to the negative absorption of electromagnetic waves is considered. It is shown that there exist a number of resonant frequencies for which the ring of particles circling in the equatorial plane of Kerr black holes amplifies the incident electromagnetic waves. The negative absorption coefficients are calculated both for non-relativistic and ultrarelativistic cases.     

Radiostratigraphic study of the deposits of the Maikop Group, Western Azerbaijan

This work presents the results of biostratigraphic study of natural outcrops of the Maikop Group, which were first carried together with detailed radiometric studies in the Ganja oil and gas-bearing region, Western Azerbaijan. The paleontological research method included determination of the genus or species (depending on the preservation) of microfaunistic remains (foraminifera, ostracods, fish remains). The radiometric research method included measurements of the integral radioactivity in the field, the sampling, as well as laboratory radionuclide (spectral) analysis. As a result of our research, the stratigraphic control of variation in the radioactivity of rocks of the Maikop Group of the Ganja oil and gas-bearing region has been established. The radioactivity of Oligocene rocks is predominantly determined by potassium content. The radioactivity of the Miocene part of the section of the Maikop Group is determined by uranium-potassium contents. Within the Ganja oil and gas-bearing region, deposits of the Kotsakhurian regional stage, which are usually referred to ??barren?? formations or anoxic ??fish facies??, contain a significant number of species of benthic foraminiferal fauna.