Electronic apparatus that can be disposed in a small space and allows multidirectional input without impairment of a click feeling. For example, certain aspects of the invention are directed toward a microelectronic device that includes a microfeature workpiece having a side and an aperture in the side. The assembly responds to commands based on engine performance and can vary the size of the opening to the metering chamber. This allows considering a possible dependency of the corresponding decomposition on the orientation of the ray, thereby allowing the imaging apparatus to improve the quality of decomposing the provided energy projection data values into the component projection data values and thus of a finally reconstructed image of the object, which is reconstructed based on the component projection data values. The molten materials store thermal energy and provide thermal stability to the treatment system.