A wafer based APC method for controlling an oxide polish step is described and combines a feed forward model that compensates for incoming wafer variations with a feed backward model which compensates for CMP variations. In one aspect, a pelvic floor support device is positioned adjacent the pelvic floor tissues. The crossflow blower hydraulically connected to one of the openings and comprises a casing rigidly built-in to the heatsink and a drum type impeller comprises magnetic means and serves as a magnetized rotor of the electric drive. The fixed electrodes are stationarily supported by the semiconductor substrate. 0001% to 5% by weight surfactant, which is preferably a soluble soap that is incorporated into the batch as it is mixed.