The design of high-speed railway lines involves geotechnical challenges, one which is the risk dynamic track amplification, for example on sections where train speed approaches track-ground critical speed. In these cases, soil strains increase significantly with an in speed, far exceeding limits linear elastic behaviour. This can result a non-linear reduction stiffness. To better understand thi...

Fast reduction of blood water volume due to ultra-filtration via hemodialysis machine and critical threshold of blood water volume can result in clinical complications such as hypotension. When blood water volume reduces during hemodialysis process, the concentration of blood forming elements will increase. One of the methods for the monitoring of the concentration changes is ultrasonic speed m...