Most Greek houses were small, with a walled garden or yard in the middle. The house was made of sun-dried mud brick. Mud houses crumbled away in a few years, and had to rebuild. So archaeologists do not dig up the ruins of Ancient Greek homes.ost Greek houses were small, with a walled garden or yard in the middle. The house was made of sun-dried mud brick. Mud houses crumbled away in a few years, and had to rebuild. So archaeologists do not dig up the ruins of Ancient Greek homes.
Quick Answer. In chromatography, the Rf value represents the ratio between the migration distance of a substance and the migration distance of the solvent front. Rf is a coefficient called retention factor and has values that range between zero and 1.
Specific Absorption Rate. (SAR) The Specific Absorption Rate is defined as the RF power absorbed per unit of mass of an object, and is measured in watts per kilogram (W/kg). The SAR describes the potential for heating of the patient's tissue due to the application of the RF energy necessary to produce the MR signal.