On the Issue of Nitrogen Solubility in Chromium-Nickel Grades of Steels

The article presents a comparative analysis of the solubility of nitrogen in chromium-nickel grades of steels. It is revealed that the existing theoretical calculations on the solubility of nitrogen in chromium-nickel steels can be applied only to austenitic grades of steels

HARDWARE AND SOFTWARE COMPLEX FOR EVALUATING THE SURFACE ROUGHNESS OF SUBSTRATES

The necessity of developing a software and hardware complex, which makes it possible to evaluate the surface roughness of ceramic substrates, is described. These substrates will be used in experiments to study the wettability of refractory carbides / oxides and iron-carbon melts

Hydrodynamics of the Motion of the Liquid Droplet of Electrode Metal in the Molten Slag

The results of mathematical modeling of liquid metal droplet hydrodynamics in the slag bath during ESR in the field of centrifugal forces are presented. The size of the bead affects its trajectory, the time of stay in the slag bath and the temperature of heating when passing the slag bath

ENGAGING NUMERICAL MODELING TO ANALYZE METALLURGICAL AND CASTING PROCESSES

This theses present the numerical modeling of direct current electroslag remelting process and hardening dispersed carbides injection in centrifugal casting process. The computer soft-ware for modeling this processes has been described

The Effect of Nordic Hamstring Strength Training on Muscle Architecture, Stiffness, and Strength

Purpose: Hamstring strain injury is a frequent and serious injury in competitive and recreational sports. While Nordic hamstring (NH) eccentric strength training is an effective hamstring injury prevention method, the protective mechanism of this exercise is not understood. Strength training increases muscle strength, but also alters muscle architecture and stiffness; all three factors may be associated with reducing muscle injuries. The purpose of this study was to examine the effects of NH eccentric strength training on hamstring muscle architecture, stiffness, and strength. Methods: Twenty healthy participants were randomly assigned to an eccentric training group or control group. Control participants performed static stretching, while experimental participants performed static stretching and NH training for 6 weeks. Pre- and post-intervention measurements included: hamstring muscle architecture and stiffness using ultrasound imaging and elastography, and maximal hamstring strength measured on a dynamometer. Results: The experimental group, but not the control group, increased volume (131.5 vs. 145.2 cm3, p\u3c0.001) and physiological cross-sectional area (16.1 vs. 18.1 cm2, p=0.032). There were no significant changes to muscle fascicle length, stiffness, or eccentric hamstring strength. Conclusions: The NH intervention was an effective training method for muscle hypertrophy, but, contrary to common literature findings for other modes of eccentric training, did not increase fascicle length. The data suggest the mechanism behind NH eccentric strength training mitigating hamstring injury risk could be increasing volume rather than increasing muscle length. Future research is therefore warranted to determine if muscle hypertrophy induced by NH training lowers future hamstring strain injury risk