Wear-Resistant Polymer Composites Based On Polytetrafluoroethylene And Layered Silicates

To improve interaction on the phase boundary of polymer composites, we used functional additives, mechanoactivation method, and ultrasound. In the case of the use of serpentine as a modifier of polytetrafluoroethylene (PTFE), the introduction of magnesium nanospinel (NS) as functional additive resulted in the increase of wear resistance of composite in 2500 times. Effect of ultrasonic irradiation on the composites comprising phlogopite was considered. IR data have shown that NS influences the intensification of the tribological processes. In sonicated composites the intensity of the IR spectra of oxidized fragments depends on the content of NS and correlates with the wear resistance

Optimality of systems of identically distributed competing processes

This paper considers the problem of optimal distribution of computational resources of multiprocessor systems based on the principles of parallelization and conveyorization. The necessary conditions and criteria of efficiency and optimality of systems of identically distributed competing processes are obtained that take into account the overheads required in the context of their run time

HALLUX VALGUS: LICKS AT THE ANKLE JOINTS, BUT BITES AT THE HIP JOINTS?

Objective: To present the coverage in the literature of recent years of the problem of the influence of foot pathology (Hallux Valgus, HV) on the condition of the proximal and distal joints of the lower limb (LL) in a comparative aspect Methods: Literature searches were carried out in the Web of Science, PubMed and Scopus databases as of September 1, 2023 using the keywords “hallux valgus”, “bunion”, “hip joint”, “knee joint”, “ankle joint”. The inclusion criterion was the availability of full-text articles in English. Exclusion criteria included reviews, case reports, and abstracts. Results: Along with the previously described changes in the spatiotemporal parameters of gait, kinematics of the ankle joint (AJ) with HV, recently there have been studies regarding its influence on the kinematics of the proximal segment of the knee joint, including those contributing to the development of osteoarthritis (OA) of the knee joint (KJ). At the same time, disturbances in the kinematics of the hip joint (HJ) in HV, leading to the development of pathomorphological changes in it, remain unexplored. Conclusion: HV is a common disease of the musculoskeletal system, significantly worsening the quality of life of patients and often leading to disability. While the effect of HV on foot kinematics and the joint axis has been described in some detail, its effect on the hip joint remains poorly understood. Surgical treatment does not lead to a significant improvement in the kinematics of the lower limb and pelvis, but, on the contrary, can lead to its negative dynamics not only in the operated, but also in the contralateral LL, which dictates the need to conduct research to identify clinically significant kinematic parameters of gait and proximal joints of the LL for HV and optimization of existing treatment approaches