Abstract: A waste collection apparatus for collecting waste in water is provided. The waste collection apparatus includes a floating device and a waste collection device coupled to the floating device. The waste collection device includes a fluid ejection element, and the flow out of the fluid ejection element flows toward a space where waste is collected.

Abstract: The disclosure provides a power management method. The power management method is applicable to an electronic device. The electronic device is electrically coupled to an adapter, and includes a system and a battery. The adapter has a feed power. The battery has a discharge power. The power management method of the disclosure includes: reading a power value of the battery; determining a state of the system; and discharging power to the system, when the system is in a power-on state and the power value is greater than a charging stopping value, by using the battery, and controlling, according to the discharge power and the feed power, the adapter to selectively supply power to the system. The disclosure further provides an electronic device using the power management method.

Abstract: The bicycle transmission device includes a hollow tube extending through the bottom bracket and two caps are connected to two ends of the hollow tube. A motor unit has two extensions and multiple fixing assemblies, wherein the extensions are positioned by the caps. The fixing assemblies fix the motor unit to the underside of the bicycle. A shaft extends through the hollow tube and a first one-way transmission device is connected to one end of the shaft. A chainwheel and a first passive wheel are connected to the other end of the transmission shaft. Two cranks are connected to two ends of the transmission shaft. A motor located in the motor unit and has a second passive wheel. The first and second passive wheels transmit energy via the belt. The present invention reduces the space required for the motor and balances the weight of the bicycle.