No abstract

We have experimentally analyzed the topological reactions occurred in the elliptic vortex-beam transmitting orthogonally to the optical axis of the SiO 2 crystal. We have revealed that the oscillations of the polarization state when propagating the beam are accompanied by reconstruction of the polarization singularities at the beam cross-section that, in turn, entails the reconstruction of the wavefront in each circularly polarized beam component. Both synchronic oscillations of the spin angular momentum and the sign of the vortex topological charge are expressing in a field structure as birth and annihilation of topological dipoles. Also periodical conversion of the vortex ellipticity along the crystal length z and huge splash of spin angular momentum were analysed. The run of the dislocation reactions in the beam component results in converting the sign of the topological charge in the centered optical vortex, the distance of the vortex conversion being about 0.05 of the wavelength.

SUMMARY Researchers base their analysis on basic drilling parameters obtained during mud logging and demonstrate impressive results. However, due to limitations imposed by data quality often present during drilling, those solutions often tend to lose their stability and high levels of predictivity. In this work, the concept of hybrid modeling was introduced which allows to integrate the analytical correlations with algorithms of machine learning for obtaining stable solutions consistent from one data set to another.

No abstract

SUMMARYIt is shown that Vendian terrigenous deposits are characterized by anisotropic mechanical properties. Transversely isotropic model with vertical axis of symmetry (TIV) was used for geomechanics model construction of one of the largest field in East Siberia. In this paper an algorithm and main aspects of geomechanical modeling with respect to anisotropy of the rock mechanical properties are presented on example of particular field. The impact of anisotropy on results of geomechanical modeling is demonstrated, justifying the need to take into consideration anisotropic effects. It is shown that anisotropy of rock mechanical properties has to be taken into account for more accurate results of different studies such as avoiding instabilities while drilling, hydraulic fracturing treatment design etc.