Concrete is the most common artificial composite material of all and typically consists of loose stones (aggregate) held with a matrix of cement. Concrete is a very robust material, much more robust than cement, and will not compress or shatter even under quite a large compressive force.
2) Y-axis contains absolute brightness Why do astronomers use the H-R Diagram? Astronomers use H-R Diagrams to classify stars and to understand how stars change over time.
Graphical representation of the relative blood volume (RBV) course during four haemodialysis sessions with constant ultrafiltration rate and conductivity. The x-axis represents the dialysis duration and the y-axis represents the RBV change.RBV curves (A), (B) and (C) are from the same patient. second system adapts the ultrafiltration rate in response to RBV changes in order to stay on the safe side of a pre-set individual RBV limit below which the patient is expected to be at risk for dialysis hypotension on the basis of earlier observations [ 40 ].