Abstract: A grading system and an application of a hydrogenation catalyst and a grading method of the hydrogenation catalyst are provided. The system contains M hydrogenation catalysts sequentially filled in a material flow direction. An R value of an Nth hydrogenation catalyst is not less than an R value of an (N?1)th hydrogenation catalyst, and the R value of at least one Nth hydrogenation catalyst is greater than the R value of the (N?1)th hydrogenation catalyst. N is an integer greater than 2 and not greater than M; the R value is a ratio of molar content of the VIII group metal element in the hydrogenation catalyst characterized by an X-ray photoelectron spectrum to weight content of the VIII group metal element in terms of oxides in the hydrogenation catalyst characterized by an X-ray fluorescence spectrum. The hydrogenation catalysts having different surface nickel atom concentrations are used for grading, thereby improving denitrification and the hydrogenation saturation performance of a catalyst system.

Abstract: A self-locking connection device includes a housing, and a sliding block and a buckle, which are mounted in the housing. The sliding block slides back and forth along the housing and is locked in case that the sliding block is pushed to a front side, and is unlocked and reset in case that the sliding block is pushed to the front side again. An inclined wall for supporting the buckle is provided inside the housing, a height of the inclined wall gradually decreases from front to rear, the buckle is connected to the sliding block to move along the inclined wall with the sliding block, and the buckle is locked at a top end and protrudes out of the opening in case that the sliding block is locked at the front side.

Abstract: A self-locking connection device is provided, which includes a housing, a sliding block and a buckle which are mounted in the housing. The sliding block slides back and forth along the housing and is locked in case that the sliding block is pushed to a front side, and is unlocked and reset in case that the sliding block is pushed to the front side again. An inclined wall for supporting the buckle is provided inside the housing, a height of the inclined wall gradually decreases from front to rear, the buckle is connected to the sliding block to move along the inclined wall with the sliding block, and the buckle is locked at a top end and protrudes out of the opening in case that the sliding block is locked at the front side.

Abstract: A method for using pins in different mode during different time is provided. The method is able to make at least one pin of a SOC be used in a first interface mode or a second interface mode during different time; wherein the SOC comprises a first interface circuit, a first pin, a second interface circuit, and a second pin; the first interface circuit comprises a first bidirectional PAD unit, a first signal interface unit of the first interface mode and a interface unit of the second interface mode; the second interface circuit comprises a second bidirectional PAD unit, a second signal interface unit of the first interface mode. The method comprises: selecting the output of the first signal interface unit or the output of the interface unit of the second interface mode to be connected with the first pin through the first bidirectional PAD unit during different time.

Abstract: A method for using pins in different mode during different time is provided. The method is able to make at least one pin of a SOC be used in a first interface mode or a second interface mode during different time; wherein the SOC comprises a first interface circuit, a first pin, a second interface circuit, and a second pin; the first interface circuit comprises a first bidirectional PAD unit, a first signal interface unit of the first interface mode and a interface unit of the second interface mode; the second interface circuit comprises a second bidirectional PAD unit, a second signal interface unit of the first interface mode. The method comprises: selecting the output of the first signal interface unit or the output of the interface unit of the second interface mode to be connected with the first pin through the first bidirectional PAD unit during different time.