A method for joining similar materials to create multi-component assemblies so the joint materials share similar physical, chemical, and electrical characteristics with the base materials. When the person falls off and moves away, the diminution in wireless signal causes the electromechanical actuator, attached to the control panel, to rotate the key which is in the ignition switch. Fluid is delivered by the pump when a plunger compresses an elastomeric membrane overlying a fluid chamber. The second gradient shield coil 84 is connected in parallel to said first gradient shield coil 82. Methods and other systems for temporary aliasing are also provided.