THE ROLE OF PSYCHOLOGICAL STRESS IN THE DEVELOPMENT OF ESSENTIAL ARTERIAL HYPERTENSION IN ELDERLY PEOPLE.

This article presents the results of a study of the correlation between psychological stress and essential arterial hypertension in elderly people living in a boarding house. The use of appropriate methods and materials, as well as the t-test to check the equality of the mean values in the two samples, allowed us to establish a certain causal relationship in the development of this disease.

Changes in the Structure of Amorphous Alloys under Deformation by High-Pressure Torsion and Multiple Rolling.

X-ray diffraction and scanning electron microscopy were used to study changes in the structure of amorphous alloys under deformation by high-pressure torsion and multiple rolling. The change in mean nearest neighbor distance (the radius of the first coordination sphere) under deformation was determined. During deformation, shear bands are formed in amorphous alloys, which are regions of lower density compared to the surrounding undeformed amorphous matrix.

Structure, Thermal Properties and Proton Conductivity of the Sulfonated Polyphenylquinoxalines.

This paper briefly reviews the results of scientific research on the proton conductivity of sulfonated polyphenylquinoxalines. Synthesis, structure (IR spectroscopy, SEM, quantum-chemical modeling, molecular weight distribution), moisture capacity, thermal properties, and proton conductivity of sulfonated polyphenylquinoxalines (sulfur content 2.6, 4.

Heat Treatment Effect on the Phase Composition of the Silica Electrochemical Coating and the Carbon Fiber Strength.

This work is devoted to the study of the chemical and phase composition of a carbon fiber coating obtained by the electrochemical sol-gel method. The experimental data obtained using several independent complementary methods, including X-ray phase analysis, thermogravimetric and differential thermal analysis, scanning electron microscopy and elemental analysis, and X-ray photoelectron spectroscopy, are in good agreement with each other. It was found that the resulting coating consists of amorphous silicon oxide and crystalline potassium carbonate.

Unraveling the Impact of Hole Transport Materials on Photostability of Perovskite Films and p-i-n Solar Cells.

We investigated the impact of a series of hole transport layer (HTL) materials such as Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), NiO, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA), and polytriarylamine (PTA) on photostability of thin films and solar cells based on MAPbI, CsFAPbI, CsMAFAPbI, CsMAFAPb(BrI), and CsFAPb(BrI) complex lead halides. Mixed halide perovskites showed reduced photostability in comparison with similar iodide-only compositions. In particular, we observed light-induced recrystallization of all perovskite films except MAPbI with the strongest effects revealed for Br-containing systems.