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The results of a study of the concentration of vitamin D in blood serum of 3455 residents of Ufa are presented. Physiological values of 25(OH)D were observed in 34.9 % (274) of men and 31.7 % (847) of women, which is 32.4 % (1121) of all examined. Vitamin D deficiency was detected in 67.1 % of the examined. The level of 25(OH)D in the blood serum of residents is on average 75 nmol/L, which is the upper limit of vitamin D deficiency. Vitamin D deficiency is extremely common among residents of this region of the Russian Federation (67.1 %).

Pipeline systems are used in almost all industries and are rightfully considered one of the safest and most economical ways of transporting various media. Nevertheless, the consequences of failure and violating the integrity of this class of equipment lead to significant technological disasters. Pipeline valves are integral elements of pipeline systems, including those responsible for operational safety. To confirm the main characteristics, such as strength and tightness, pipeline valves must pass a set of tests. However, the problem of equipping production facilities with test equipment is relevant now because a significant part of the equipment fleet no longer fully complies with current operating conditions. Therefore, this study develops equipment for in-plant pneumatic testing of swing check valves for pipeline systems of hazardous production facilities with ultra-high parameters of the working media. Keywords —finite-element method, mathematical simulation, pipeline system, pipeline valves, pneumatic testing, strength analysis, stress-strain state, swing check valve, technological hydraulic installation

The results of a study of the concentration of vitamin D and parathyroid hormone in 353 residents of the Republic of Bashkortostan in blood serum. The frequency of hypovitaminosis and a deficiency of 25 (OH) D in the older age groups of the population of the Republic of Bashkortostan is excessively high, the level reaches 77.1 %. The average value of parathyroid hormone was 55.1 ± 26.33 pg/ ml, vitamin D –22.57 ± 12.24 ng / ml. A negative correlation between 25 (OH) D and the level of PTH is characteristic (r = –0.144, p <0.001). Normal level of parthyrin was detected in 89.8 %, an excess in 8.8 % of the studied, which indicates the active work of the gland in conditions of cholecalciferol deficiency.