مؤلف: Robert C. Sapri

Vibration refers to mechanical oscillations about an equilibrium point. The oscillations may be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road.Vib …

Hafnium is a chemical element with the symbol Hf and atomic number 72. This book brings together contributions from experts in their related fields to illustrate the significance and importance of ha …