Stationary electrical polarizing field and charge in plasma of the solar atmosphere

The dependence of the proton velocity and concentration, electric field, electric charge and electron density on a distance from the centre of the Sun is derived within the framework of hydrodynamical two-zoned model

Study of nanomodification of nickel alloy GS3 with titanium carbide

The work deals with the fundamentals of nanomodification of the GS3 heat-resisting multicomponent nickel alloy, out of which blades for gas turbine engines are made. The selection of the modifier for the experimental alloy was justified; the technology of acquiring the nanomodifier, using the plasma-chemical synthesis method, was developed; and the calculations of the specific surface of the TiC particles were performed. The required quantity of nanomodifier introduced to the liquid alloy to acquire the set structure was determined experimentally. Through electronic microprobe analysis, introduction to the metal matric of nanoparticles of titanium carbide is approved. Nanomodification allows achieving refinement of the GS3 nickel alloy structure, which is going to provide an opportunity to increase the effective life of gas turbine engine blades.Розглянуто основи наномодифікування жароміцного багатокомпонентного нікелевого сплаву ЖС3, з якого виготовляються лопатки для газотурбінних двигунів. Обґрунтовано вибір модифікатора для експериментального сплаву; розроблено технологію отримання наномодифікатора за допомогою методу плазмохімічного синтезу; проведено розрахунки питомої поверхні частинок TiC. Експериментальним шляхом встановлено необхідну кількість наномодифікатора, що вводиться в розплав для отримання заданої структури. За допомогою мікрорентгеноспектрального аналізу підтверджується впровадження у металеву матрицю наночастинок карбіду титану. Наномодифікація дозволяє досягти подрібнення структури нікелевого сплаву ЖС3, що дасть можливість збільшити термін експлуатації лопаток газотурбінних двигунів

Guideline for diagnostic, prevention and treatment of postmenopausal osteoporosis

Background.Postmenopausal osteoporosis (PMO), which is developed due the estrogen deficiency in women after menopause, is the most common type of systemic osteoporosis. The latest Ukrainian recommendation for its management requires revision due to new data from high-quality research performed in recent years. Thepurposewas to develop a guideline on the diagnosis, prevention, and treatment of PMO based on an analytical analysis of modern literary sources in order to improve the awareness of the medical community of Ukraine. Methodology. To develop the guideline, an expert group of 13 leading Ukrainian scientists of various specialties was created who conducted a thorough review of modern literature on this topic, assessed the level of existing evidence using the GRADE system, proposed and voted on 15 recommendations of the guideline. Results. The guideline contains chapters on diagnosis and differential diagnosis of PMO, assessment of the osteoporotic fracture risk, the role of bone turnover markers in the management of PMO, and modern strategies of antiosteoporotic treatment.Conclusions. The Ukrainian guideline on the diagnosis, prevention, and treatment of PMO, which contains 15 main recommendations, created on the basis of a thorough analysis and synthesis of modern literature data, is an important tool for the management of PMO and is recommended by Ukrainian Association of Osteoporosis for use in Ukrainian medical community

Increase of reliability of welded workings organs and frames of machines for earthworks

Показана можливість підвищення надійності зварних конструкцій із листових двофазних низьколегованих сталей шляхом мікролегування металу шва ітрієм.Показана возможность повышения надежности сварных конструкций из листовых двухфазных низколегированных сталей путем микролегирования металла шва иттрием.Possibility of increase of reliability of weldments is rotined from sheet diphasic низколегированных сталей by the microalloying of metal of guy-sutures by a yttrium