A method of upgrading a 1,500 rpm reactor coolant pump motor having a vertically oriented rotor shaft supported by a lower guide bearing disposed in an oil reservoir. Each feedforward controller is designed to be optimal for a canceling a specific associated RV spectrum. Followup analyses by indirect immunofluorescence showed that both serum IgG and fecal IgA recognized human peripheral blood mononuclear cells infected with either syncytium-inducing or non-syncytium-inducing North American HIV-1 field isolates, but not uninfected cells. The null subspace for each node is taken into consideration when communicating with a particular node.