Sulfur-doping effects on oxygen vacancy formation in LaBO (B = Fe, Co, and Ni) perovskites.

Oxygen vacancy (V) formation in perovskites plays an important role in improving their functional applications. Using density functional theory calculations, we investigated the effect of sulfur (S) doping on V formation in LaBO (B = Fe, Co, and Ni) perovskites, considering the HS, IS, and LS states of Co ions in LaCoO to examine the influence of spin states. Our results show that the weaker electronegativity of S than that of O leads to a decrease in the magnetic moment of B atoms directly adjacent to the substituted S and an increase in the electrical conductivity of insulating systems.

Ni-doping effects on formation and migration of oxygen vacancies in SrFeNiO oxygen carriers.

Ni is a promising B-site doping element capable of improving the oxygen carrier performance of SrFeO perovskite. In this work, the effect of Ni doping on the formation and migration of oxygen vacancies in SrFeNiO ( = 0, 0.0625, 0.

Key Generation Method Based on Multi-Satellite Cooperation and Random Perturbation.

In low-earth-orbit (LEO) satellite-to-ground communication, the size of satellite antennae is limited and the satellite motion trajectory is predictable, which makes the channel state information (CSI) of the satellite-to-ground channel easy to leak and impossible to use to generate a physical layer key. To solve these problems, we propose a key generation method based on multi-satellite cooperation and random perturbation. On the one hand, we use multi-satellite cooperation to form a constellation that services users, in order to increase the equivalent aperture of satellite antennae and reduce the correlation between the legal channel and the wiretap channel.