Abstract: Disclosed are an implement descending stability control method and system and a tractor. An outlet of a main pump is communicated with an inlet of a main overflow valve, an inlet of a constant-difference overflow valve and an inlet of an implement control valve. An oil outlet of the implement control valve is connected with a spring cavity of the constant-difference overflow valve through a steady-state throttle valve and is communicated with an inlet of a switching valve. An oil outlet of the switching valve is connected with a rodless cavity of a suspension cylinder in a suspension mechanism, and the rodless cavity of the suspension cylinder is communicated with an inlet of a descending valve. A rod cavity of the suspension cylinder is connected with an inlet of a secondary overflow valve.

Abstract: The present invention provides an N-substituted isopropyldimethyl azulene sulfonamide derivative as represented by formula (I), and preparation method and uses thereof, wherein R1 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heteroaryl, amino, or a substituted alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heteroaryl, and amino. The N-substituted isopropyldimethyl azulene sulfonamide derivative can be used in treating gastric ulcer.

Abstract: The present invention provides an N-substituted isopropyldimethyl azulene sulfonamide derivative as represented by formula (I), and preparation method and uses thereof, wherein R1 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heteroaryl, amino, or a substituted alkyl, cycloalkyl, alkenyl, alkynyl, aryl, heteroaryl, and amino. The N-substituted isopropyldimethyl azulene sulfonamide derivative can be used in treating gastric ulcer.