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Your search keyword '"Korolev, A.V."' showing total 43 results
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43 results on '"Korolev, A.V."'

19. New material for anti-wear corrosion-resistant coating of agro industrial complex machinery parts

Author

Okhlupin D.N., Korolev A.V., and Sinev I.V.

Subjects
Environmental sciences, GE1-350
Abstract

The article presents the results of an experimental study of the corrosion resistance of the ta-C double coating of parts by PVD method with intermediate and final surface polishing with a discrete tool. The influence of regime factors on the results of polishing the ta-C coating with a discrete tool is shown, and optimal processing modes are proposed. Tests of samples in a salt bath showed that the double ta-C coating by PVD method with intermediate and final polishing ensures the absence of corrosion and coating peeling

Published
2020
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29. Surgical treatment of comminuted intraarticular distal femur fracture in patient with osteogenesis imperfecta type I

Author

1, The investigation didn't have sponsorship, Исследование не спонсировалось, Burtsev M.E., Frolov A.V., Logvinov A.N., Ilyin D.O., Korolev A.V., 1, The investigation didn't have sponsorship, Исследование не спонсировалось, Burtsev M.E., Frolov A.V., Logvinov A.N., Ilyin D.O., and Korolev A.V.

Abstract

Aim. Osteogenesis imperfecta (OI) is characterized by bone fragility and long bones deformities. Most studies are dedicated to surgical treatment of diaphyseal fractures. To our knowledge, there are no reports giving recommendations about surgical treatment of distal femur intraarticular fractures. Clinical case. We describe the surgical treatment of a 14-year-old girl with OI who had intraarticular fracture of the left distal femur and fracture of a right femur diaphysis. Surgical treatment was complicated by migration of a titanium elastic nail and impaired consolidation, which had to be fixed with a plate and led to peri-implant fracture. Results were assessed before trauma and at 1 and 2 years after trauma with Gillette Functional Assessment Questionnaire (GFAQ) and Bleck score. Discussion. During surgical treatment of comminuted intraarticular distal femur fractures in patients with OI, we had to use big cancellous screw that made implantation in an intramedullary fixator more difficult. Internal fixation with a plate in patients with OI is associated with high risks of peri-implant fracture. Conclusion. For treatment of comminuted intraarticular fracture of the distal femur, it is necessary to have large variety of internal fixators, follow the principles of absolute and relative stability, and be familiar with minimally-invasive techniques., Введение. При несовершенном остеогенезе часто встречаются переломы и деформации длинных трубчатых костей. В литературе, посвященной хирургическому лечению переломов бедренной кости, описаны методы остеосинтеза диафизарных переломов, но отсутствуют рекомендации по лечению внутрисуставных переломов дистальной трети бедренной кости. Описание случая. В работе представлен клинический случай лечения пациентки 14 лет с I типом несовершенного остеогенеза, которая перенесла тяжелый внутрисуставной оскольчатый перелом дистальной трети левой бедренной кости и перелом диафиза правой бедренной кости. Хирургическое лечение внутрисуставного перелома осложнилось миграцией титанового эластичного стержня (TEN), замедленной консолидацией дистального метадиафиза бедренной кости, потребовавшей применения пластины, что повлекло за собой переимплантный перелом. Двигательные возможности до травмы, через 1 и 2 года после травмы были оценены по шкалам GFAQ (Gillette Functional Assessment Questionnaire) и Bleck Score. Обсуждение. Хирургическое лечение внутрисуставного оскольчатого перелома дистальной трети бедра у ребенка с несовершенным остеогенезом потребовало установки спонгиозных винтов большого диаметра в метаэпифизе, что затрудняет использование интрамедуллярного фиксатора. Применение пластин у пациентов с несовершенным остеогенезом сопровождается высоким риском переимплантных переломов. Заключение. При лечении внутрисуставных оскольчатых переломов дистальной трети бедренной кости необходимо иметь в распоряжении широкий выбор металлофиксаторов, соблюдать принципы абсолютной и относительной стабильности и владеть мини-инвазивными методиками.

Published
2019

35. ON ERGODICITY OF A SYSTEM DESCRIBING THE LIQUID FLOW

Author

KOROLEVA YU. O. and KOROLEV A.V.

Subjects
Physics::Fluid Dynamics
Abstract

The paper considers the Stokes system that model a liquid flow in a layer between solid bodies. The ergodic properties of the considered model are studied.

Published
2016

43. Structural and magnetic investigations of CaBaCo4−xFexO7 solid solutions.

Author

Turkin, D.I., Bazuev, G.V., and Korolev, A.V.

Subjects
*CRYSTALLIZATION, *PHYSICAL & theoretical chemistry, *SOLIDIFICATION, *SOLID solutions, *MAGNETIC measurements
Abstract

Solid solutions of CaBaCo 4− x Fe x O 7 ( x =0, 0.05, 0.2, 1, 2) were synthesized by glycine-nitrate combustion process. Their structural and magnetic properties were characterized by means of x-ray diffraction and magnetization measurements. In the examined range of the solid solutions, their crystal lattice symmetry changes from orthorhombic with space group Pbn2 1 (0< x <0.5) to hexagonal with space group P 6 3 mc ( x >0.5). The magnetic measurements revealed that even small doping ( x =0.05) of the transition metal sublattice noticeably suppresses ferrimagnetism of the parent compound and induces an AF transition at 88 K. An increase in the doping concentration lowers the frustration parameter | θ CW |/ T C from 17.2 (for x =0.05) to 13.7 (for x =2) and strengthens the antiferromagnetic interactions, which manifests itself in the Curie–Weiss temperature ( θ CW ) growth. The samples with x =0.05 and x =0.2 also show an additional magnetic transition at temperatures T g (55 and 70 K respectively). The temperature irreversibility between the ZFC and FC magnetization curves may suggest the formation of a spin-glass state below that temperature. [ABSTRACT FROM AUTHOR]

Published
2017
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