A method for reducing a ripple, caused by rotational nonuniformity of an internal combustion engine, in the output voltage of a generator which is driven by the internal combustion engine is provided. The invention further provides for apparatus and systems for using the microfluidic devices, analyze reactions carried out in the microfluidic devices, and systems to generate, store, organize, and analyze data generated from using the microfluidic devices. This can result in an iso-dense bias mismatch between systems. The at least one lid is pivotally secured to the cover plate for movement between a closed position covering the receptacle and an open position permitting access to the receptacle. The twin wire former is characterized in that, the two wire belts run upwards after a passing a first deviation device, forming an angle relative to an imaginary second horizontal plane, in such a way that the upper vertex of the second deviation device lies above the lower vertex of the first deviation device, and that the angle relative to the imaginary first plane runs downwards.