For the first time, using the technology of selective laser sintering, prototypes of rocket engine compressor blades were manufactured with subsequent analysis of the strength, technological, physical and mechanical characteristics of the product. The physical and mechanical properties of the manufactured blades were investigated, it was found that the short-term strength limit at 20 °C is 1450 MPa, and at 300 °C the ultimate strength is 1300 MPa, thus thermal losses in deformation resistance are no more than 12%, which allows the material to be used in aircraft construction, including for supersonic aircraft
The nutritional needs of Russian schoolchildren require careful analysis, and the ability of schools to provide a healthy diet for their students should be a subject of public policy in Russia.In the past ten years, children's health has become qualitatively worse. According to the data from numerous studies in Russia, only 10 percent of the upper-grade students in secondary school can be considered healthy. At the same time, half the students have morphofunctional impairments, and 40 percent suffer from chronic pathology. In the past few years, diseases that affect the digestive organs have increased by forty times, due to the poor organization of students' food services and the psychoemotional tension that stems from living conditions and school life [1, pp. 166-79].English translation
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