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Biomechanical properties of bicortical and monocortical plate fixation for rib fractures in the adolescent human rib fracture model

Glowacki Jakub, Bartkowiak Tomasz, Paczos Piotr, Zielinski Michał, Smyczynski Mikołaj, Pelic Marcin

Acta of Bioengineering and Biomechanics

2023

Vol. 25, no. 3

The technical advancement of surgical stabilization of ribs often prevents the surgeons from fixation, despite the procedure`s documented improved outcomes. The aim of this study was to evaluate a less invasive approach involving a simplified monocortical rib fixation technique.

Energy analysis of a real suction-pressure unit

Myszkowski Adam, Staniek Roman, Zielinski Michał

Mechanics and Mechanical Engineering

2020

Vol. 24, nr 1

26--35

The article presents an energy analysis of a real suction-pressure unit of a high-efficiency radial piston pump. This pump can be used in small hydropower plants, where, together with a variable displacement hydraulic motor, it would form a hydrostatic transmission. The main advantage of this solution is the possibility of a stepless, automatic change of gear ratio during its operation, which allows an increase of the efficiency of power generation in a hydropower plant. Mathematical models of friction and resistance of flow through self-acting and geometrical deformations of chambers and piston under stress field are presented. In addition, mass, volume, and energy balance calculations were computed for the ideal unit and pressure losses were determined. Derived indicator diagrams for each chamber of the ideal suction-pressure unit served to analyze the technical work of occurring processes. The paper also presents the formulation of total efficiency of the unit. Lastly, the experimental procedure is presented, according towhich it is possible to register the most important parameters of the proposed model.