The present invention relates to use of selective oxidation to oxidize silicon in the presence of tungsten andor tungsten nitride in memory cells and memory arrays. The assembly has a plurality of hollow fiber filtering membranes disposed generally vertically between two solid bodies, an enclosure sealed to the upper solid body to define a cavity, a permeate port in communication with the cavity and the lumen of each membrane in fluid communication with the port via the cavity. Enantioselective methods for preparation of compounds of structure, compositions comprising a compound of structure in combination with a pharmaceutically acceptable carrier or diluents and methods of SHIP1 modulation by administration of such compounds to an animal in need thereof are also disclosed. This simplifies the operations and procedures needed for achieving a desired blasting pattern, without sacrificing safety or quality. When vibration of the spring vibrator is stopped, a signal opposite to that when the spring vibrator is vibrated is applied from the spring vibration control integrated circuit to the switching element so as to cause the spring vibrator to generate a force to attenuate vibration and to stop the vibrator from vibrating. The released springs push the piston which partially retracts the actuator stem into the housing causing the valve to be closed.