This invention relates to circuit boards and methods of fabricating circuit boards. The blocking valves and the bleed valves are actuated by one or more control valves under the control of a process or safety controller which trips the turbine by first performing a bleed function using the bleed valves, which then causes the block function to automatically actuate. The bust detection method comprises the following steps: At first, a reciprocal value of the received signal’s power is calculated. The program causes the display of a control panel, and the Web page may be customized according to a customizing operation initiated by a user via the control panel. Bias applying layers formed on these layers for applying a bias in a longitudinal direction of the soft magnetic layer are made of antiferromagnetic RuxMyMnz, where M is Rh, Pt, Pd, Au, Ag, Re, Ir and Cr, 1×30, 1y30, 69z90 and 10xy31 and the unit of x, y, z is atomic %. An easy-to-open portion 24 is provided in part of the sealed portion 22, and the easy-to-open portion 24 is opened when the cell 10 abnormally generates heat.