Abstract: Embodiments of the present disclosure provide an active equalizer circuit, a battery management system, a power supply system and an electrical equipment. The active equalizer circuit comprises a plurality of switching transistors, a driving transformer, a multi-port converter, a buck converter, and a microcontroller. Each of the switching transistors is coupled to a battery cell in the series battery pack on a one-to-one basis. The multi-port converter comprises an equalizing transformer and a bridge converter, each secondary winding of the bridge converter is coupled to a corresponding plurality of battery cells. The buck converter has an input terminal coupled to an output terminal of the series battery pack and an output terminal coupled to an input terminal of the bridge converter.

Abstract: The present invention provides a virulent Pseudomonas fluorescens (P. fluorescens) phage ?Pf1901, and a phage ?Pf1901 preparation and an application thereof, and relates to the technical field of phage. The virulent P. fluorescens phage ?Pf1901 has an accession number of CCTCC M2019447. The virulent phage ?Pf1901 has a titer of (1.4-3)×1010 PFU/mL. The virulent phage ?Pf1901 has an optimal multiplicity of infection (MOI) value of 0.0001. The virulent P. fluorescens phage ?Pf1901 provided by the present invention exhibits very high specificity and lytic ability to P. fluorescens, which can be used to control P. fluorescens, with strong lytic and scavenging effects on a host.

Abstract: The present invention provides a virulent Pseudomonas fluorescens (P. fluorescens) phage ?Pf1901, and a phage ?Pf1901 preparation and an application thereof, and relates to the technical field of phage. The virulent P. fluorescens phage ?Pf1901 has an accession number of CCTCC M2019447. The virulent phage ?Pf1901 has a titer of (1.4?3)×1010 PFU/mL. The virulent phage ?Pf1901 has an optimal multiplicity of infection (MOI) value of 0.0001. The virulent P. fluorescens phage ?Pf1901 provided by the present invention exhibits very high specificity and lytic ability to P. fluorescens, which can be used to control P. fluorescens, with strong lytic and scavenging effects on a host.

Abstract: A belt-driven tape cartridge has a rectangular housing with a front wall shorter than its side walls. The front wall has an access opening for a tape read/write head and a drive opening. A pair of tape spools are rotatably mounted in the housing so as to lie on an axis oriented at an angle to the front wall, and a plurality of tape guides define a tape path between the spools and across the access opening. An endless drive belt extends around a drive roller at the drive opening and at least three belt guide rollers in a belt path arranged to contact tape on each spool. The tape path has extended portions extending between the tape contacting portions on each side of the spools. At least one belt guide roller is located in the same extended portion of the belt path as the drive roller, and at least two belt guide rollers are located in the other extended portion of the belt path.

Abstract: A belt-driven tape cartridge has a rectangular housing with a front wall shorter than its side walls. The front wall has an access opening for a tape read/write head and a drive opening. A pair of tape spools are rotatably mounted in the housing so as to lie on an axis oriented at an angle to the front wall, and a plurality of tape guides define a tape path between the spools and across the access opening. An endless drive belt extends around a drive roller at the drive opening and at least three belt guide rollers in a belt-path arranged to contact tape on each spool. The tape path has extended portions extending between the tape contacting portions on each side of the spools. At least one belt guide roller is located in the same extended portion of the belt path as the drive roller, and at least two belt guide rollers are located in the other extended portion of the belt path.