Abstract: An energy adjustor coupled between a fuel cell group and a secondary battery group is disclosed. A load is coupled to the secondary battery group in parallel. The energy adjustor includes a boost regulation module, a drop regulation module, a detecting module and a control module. The boost regulation module boosts an output voltage of the fuel cell group to generate a first adjustment voltage according to a first control signal. The drop regulation module drops the first adjustment voltage to generate a second adjustment voltage to the load according to a second control signal. The detecting module detects at least one of the fuel cell group, the boost regulation module, the drop regulation module and the load to generate a detection result. The control module generates the first and the second control signals according to the detection result.

Abstract: A skate includes a lower base, an upper base adjustably mounted on the lower base, and a control knob mounted on the lower base and detachably locked onto the upper base. The upper base has a slide provided with a plurality of locking teeth. The control knob is movably mounted in the lower base and has a first end provided with a support and a second end provided with a press button protruding from the lower base. The support of the control knob has a locking groove detachably locked on one of the locking teeth of the upper base.

Abstract: A lithium-ion rechargeable battery preparation methods that utilizes a double-injection method to reduce the thickening of the solid electrolyte interface (SEI) membrane caused by electrolyte additives such as lithium bis(oxalato)borate (LiBOB). The method includes injecting a portion of the electrolyte into the battery for the formation process and injecting a second portion of the electrolyte into the battery with the additives after the formation process.

Abstract: A dual-band antenna is provided, which includes a signal resonance unit, a grounding unit, a connection unit, and a signal line. The grounding unit is disposed opposite to the signal resonance unit. The connection unit has a first connection element and a second connection element, wherein one end of the first connection element is connected to the signal resonance unit and the other end of the first connection element is connected to the grounding unit, while one end of the second connection element is connected to one side of the first connection element. The signal line has a signal feeding end and a circuit connection end, wherein the signal feeding end is electrically connected to the second connection element, and the circuit connection end is electrically connected to a wireless circuit device.

Abstract: A skate includes a wheel seat, a heel hard shell adjustably mounted on the wheel seat, a guide mechanism mounted between the wheel seat and the heel hard shell to guide movement of the heel hard shell relative to the wheel seat, and a size adjustment operation device mounted between the wheel seat and the heel hard shell. Thus, the user only needs to press the locking plate of the size adjustment operation device so as to adjust the position of the heel hard shell relative to the wheel seat, so that the size of the skate is adjusted easily and conveniently, thereby facilitating the user adjusting the size of the skate.