Disclosed is a process for storing solar energy in organic compounds. One example method comprises, after shutting down the engine and spinning down the engine to rest, operating a vacuum pump to draw fresh air through the exhaust system to an intake system, and regenerating at least a portion of the particulate filter during the engine rest. A network packet traverses the queues once it satisfies the constraint associated with that queue. An unobjectionable opening process with a low speed of the opening cylinder and with a widened opening cylinder can be achieved with the sliver spreading device of the invention which process is associated with a high-precision dosing and high yarn uniformity.