In an electronically controlled throttle apparatus, a coil spring is shaped to extend from a U-shaped hook portion which is a joint between a first spring portion having a returning function and a second spring portion having an opening function to the other end of the second spring portion. The mobile payment method for a server includes: receiving a payment request message sent by a client; and selecting one piece of payment channel information in a preset payment channel information set and issuing the same to the client. A cell N well is located within the memory region in the semiconductor substrate. An actuator comprising a piezo-electric stack may employ contact-based electrical connection rather than soldered wires to improve packing density. A biomass recycle is provided to the reactor, thus increasing the reactor biomass retention time, or solids retention time within the reactor. The capacitive energy storage element may include one-way energy transfer elements coupled between the super capacitor and the gun-hardened capacitor.