The present invention is to provide a high transmittance glass sheet that has a composition containing as coloring components, expressed in wt. A semiconductor substrate is etched to form a trench, a gate electrode is buried in the trench, an etch-back process thereon is performed to form a buried gate, and an insulating layer is formed at the entire surface with the trench. The dead-end channel is adapted to trap a gas bubble within the dead-end channel when the device is primed or filled with a liquid fluid, wherein the gas bubble changes its size or position if a change in pressure or temperature occurs in the device. The computer system may be integrated as part of a base station or may be provided as a separate entity. Multiple air gaps and multiple stripes of varying magnetic properties may be provided to enhance measuring accuracy and convenience. The present process comprises treating a surface of the silicon wafer with an aqueous etch solution comprising hydrofluoric acid and an oxidizing agent, followed by optical inspection of the treated wafer surface prior to subjecting that surface to conventional mechanical or mechanochemical polishing.