Abstract: A method for estimating a flight time of a hydrogen fuel cell UAV (unmanned aerial vehicle) includes multiple steps performed by a controller: obtaining an internal pressure of a hydrogen tank by a pressure sensor installed on the hydrogen tank, calculating a remaining hydrogen volume according to the internal pressure and a capacity of the hydrogen tank, obtaining a reaction current value of the fuel cell, calculating a first hydrogen consumption rate according to the reaction current value, the number of a set of membrane electrodes connected in series and a Faraday constant, obtaining a second hydrogen consumption rate of a purge operation of an anode of the full cell; obtaining a hydrogen leakage rate of a stack of the fuel cell, and calculating the flight time according to the remaining hydrogen volume, the first hydrogen consumption rate, the second hydrogen consumption rate and the hydrogen leakage rate.

Abstract: A method of forming a package structure includes an etching step, a laser step, a plating step and a singulation step. In the etching step, a plurality of cutting streets of a leadframe are etched. In the laser step, a plastic package material covering on each of the cutting streets is removed via a laser beam. In the plating step, a plurality of plating surfaces are disposed on a plurality of areas of the leadframe without the plastic package material. In the singulation step, the cutting streets of the leadframe are cut to form the package structure.

Abstract: An examination and test system for nuclear-grade control valve is provided and includes a hermetic first chamber, a base, a guide unit, a winder, a steel cable, and a length measurement device. The hermetic first chamber includes a second chamber for accommodating a control valve. The base is disposed outside the hermetic first chamber. The guide unit is disposed on at least one of the control valve and the base. The winder and the length measurement device are disposed on the base. The steel cable connects with a valve rod of the control valve and extends out of the hermetic first chamber to connect with the winder. The steel cable is wound on the guide unit, wound up by the winder, and thus rendered taut at any time. The length measurement device has a measurement element coupled to the steel cable and displays the displacement of the measurement element.

Abstract: An examination and test system for nuclear-grade control valve is provided and includes a hermetically sealed chamber, a base, a guide unit, a winder, a steel cable, and a length measurement device. The hermetically sealed chamber includes a chamber for accommodating a control valve. The base is disposed outside the hermetically sealed chamber. The guide unit is disposed on at least one of the control valve and the base. The winder and the length measurement device are disposed on the base. The steel cable connects with a valve rod of the control valve and extends out of the hermetically sealed chamber to connect with the winder. The steel cable is wound on the guide unit, wound up by the winder, and thus rendered taut at any time. The length measurement device has a measurement element coupled to the steel cable and displays the displacement of the measurement element.