MRI of a knee. MRIs employ powerful magnets which produce a strong magnetic field that forces protons in the body to align with that field. When a radiofrequency current is then pulsed through the patient, the protons are stimulated, and spin out of equilibrium, straining against the pull of the magnetic field.
Noun. 1. aestivation - (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period. estivation. zoological science, zoology-the branch of biology that studies animals.
Passivation is a process to build up a layer of Chromium oxide armour on Austenetic Stainless steel of ships cargo tanks. This mono-molecular oxide layer is about 10 angstroms (one divided by 10 million-- millimeters) is invisible, chemically unreactive, self repairing and uni-potentialises the Stainless steel surface.