Abstract: Embodiments of this application provide a Wi-Fi communication method and apparatus, and relate to the wireless communication field. A station may obtain detection information including a start time point at which an access point actually sends a beacon packet to the station for one time, obtain a low power consumption parameter based on the detection information and a first time interval, and receive the beacon packet from the access point based on the low power consumption parameter. The low power consumption parameter includes an actual wakeup periodicity of the station and an actual receive window length within which the station receives the beacon packet, or the low power consumption parameter includes an actual wakeup periodicity of the station, and the actual wakeup periodicity of the station is greater than a preconfigured wakeup periodicity of the station.

Abstract: The present invention provides a high-low-voltage conversion star multi-phase variable-frequency drive system and relates to a high-voltage high-power motor and drive control thereof. The variable-frequency drive technical solution which is commonly used at present mainly has the disadvantages that a frequency converter is added to a common motor, the insulation life of the motor is short and the heat dissipating ability of the motor is poor.

Abstract: The present invention provides a high-low-voltage conversion star multi-phase variable-frequency drive system and relates to a high-voltage high-power motor and drive control thereof. The variable-frequency drive technical solution which is commonly used at present mainly has the disadvantages that a frequency converter is added to a common motor, the insulation life of the motor is short and the heat dissipating ability of the motor is poor.

Abstract: Disclosed are a HPPH lyophilized powder injection for injection and the preparation method thereof. The HPPH lyophilized powder injection contains HPPH, auxiliary solvents, solubilizing agents, excipients, and pH adjusting agents. The HPPH lyophilized powder injection is loose and has good resolubility, low moisture, and good stability.

Abstract: Disclosed are a HPPH lyophilized powder injection for injection and the preparation method thereof. The HPPH lyophilized powder injection contains HPPH, auxiliary solvents, solubilizing agents, excipients, and pH adjusting agents. The HPPH lyophilized powder injection is loose and has good resolubility, low moisture, and good stability.