Abstract: The present invention provides a ring varistor for use in DC micromotor including a ring varistor substrate having nonlinear volt-ampere characteristics and at least three independent electrodes evenly sintered on an end face of the ring varistor substrate. The electrode gap between two adjacent electrodes consists of two straight parallel edges of the two adjacent electrodes, and an inner and an outer concentric arc on the substrate ring, the electrode gap is not orthogonal to the ring. Due to the asymmetry arrangement of the surface electrodes and the electrode gaps, the electrode materials and the substrate materials with different thermal conductivity have no contact cross distribution with each other at the radial electrode gap. During welding, the heat shock is transmitted asymmetrically through the asymmetric electrodes, to improve the uniformity of the heat conduction distribution of the varistor and reduce the defective rate of the substrate welding fracture.

Abstract: This application provides a thermal management system and an electric vehicle. The thermal management system includes a battery water circuit and a seat water circuit. The battery water circuit includes a cooling water pump and a battery cooling/heating plate connected through a cooling water pipe. The seat water circuit has a liquid inlet end and a liquid outlet end. The liquid inlet end is connected between a liquid outlet of the cooling water pump and a liquid inlet of the battery cooling/heating plate through a seat water pipe and the cooling water pipe, and the liquid outlet end is connected between a liquid inlet of the cooling water pump and a liquid outlet of the battery cooling/heating plate through the seat water pipe and the cooling water pipe. The seat water circuit can be cooled by using the battery water circuit, to improve energy efficiency of the thermal management system.

Abstract: Provided are the expression method of influenza virus polymerase PAc-PB1N complex, the co-crystallization method of the complex and the three-dimendional structure of the crystal of PAc-PB1N complex. Also provided are the compounds binding to the influenza virus polymerase PAc and the expression method of influenza virus polymerase PAN. The three-dimensional structure of the crystal of PAc-PB1N complex can be used for screening and designing the drug for the treatment of influenza.

Abstract: Provided are the expression method of influenza virus polymerase PAc-PB1N complex, the co-crystallization method of the complex and the three-dimendional structure of the crystal of PAc-PB1N complex. Also provided are the compounds binding to the influenza virus polymerase PAc and the expression method of influenza virus polymerase PAN. The three-dimensional structure of the crystal of PAc-PB1N complex can be used for screening and designing the drug for the treatment of influenza.