A pivot position in a matrix, A, is a position in the matrix that corresponds to a rowâleading 1 in the reduced row echelon form of A. Since the reduced row echelon form of A is unique, the pivot positions are uniquely determined and do not depend on whether or not row interchanges are performed in the reduction process. Also, the pivot of a row must appear to the right of the pivot in the above row in row echelon form.
Distribution pipes send water to the fire sprinkler heads using. a water source to maintain and increase water pressure according to design criteria. Modern systems can detect a fire condition and discharge water. quickly, before a fire grows to a fatal or catastrophic size, reducing fire deaths by nearly 100 percent.
''So the O.D.S. is designed to shut off the gas supply to the fireplace when the oxygen level falls to 18.5 percent.''. That is accomplished, she said, by placing what is known as a thermocouple -- a switch turned on or off by heat -- at the base of the flame produced by the fireplace's pilot light.