Abstract: A diesel fuel injector based on a hollow spray structure induced by vortex cavitation in a nozzle, including a needle valve, a nozzle body, a plurality of spray holes, and a sac chamber. An axis of the needle valve coincides with an axis of the nozzle body. The spray holes are evenly distributed on a head of the nozzle body, and each have a converging conical structure. An inlet end of the spray hole is communicated with the sac chamber. The sac chamber consists of a hemispherical cavity and a cylindrical cavity.

Abstract: A diesel fuel injector based on a hollow spray structure induced by vortex cavitation in a nozzle, including a needle valve, a nozzle body, a plurality of spray holes, and a sac chamber. An axis of the needle valve coincides with an axis of the nozzle body. The spray holes are evenly distributed on a head of the nozzle body, and each have a converging conical structure. An inlet end of the spray hole is communicated with the sac chamber. The sac chamber consists of a hemispherical cavity and a cylindrical cavity.

Abstract: A method for combining with a minimum isolation bandwidth includes: determining an insertion loss and an isolation between ports of a combiner; calculating a total isolation bandwidth of an isolation band in the combiner according to the insertion loss and the isolation between ports; determining guard bandwidths adjacent to the isolation band in combined systems, the combined systems being at least two communication systems combined by the combiner; and, calculating an actual isolation bandwidth of the combiner according to the guard bandwidths of the combined systems and the total isolation bandwidth.

Abstract: The present disclosure provides a device for wireless access, which pertains to the technical field of wireless network. The device for wireless access includes a device body; a radio frequency circuit disposed inside the device body; and a plurality of antenna units disposed on an external surface of the device body, each of the plurality of antenna units being connected to the radio frequency circuit; wherein each of the plurality of antenna units comprises an antenna oscillator, and the antenna oscillators on each two adjacent antenna units of the plurality of antenna units are misaligned with each other. By disposing antenna oscillators of adjacent antenna units on the misaligned regions of the respective antenna unit, the interference of co-frequency signals between adjacent antenna units may be reduced, and the isolation of adjacent antenna units may be enhanced. Thus, adjacent antenna units may be disposed at a reduced distance therebetween.

Abstract: The present disclosure provides a device for wireless access, which pertains to the technical field of wireless network. The device for wireless access includes a device body; a radio frequency circuit disposed inside the device body; and a plurality of antenna units disposed on an external surface of the device body, each of the plurality of antenna units being connected to the radio frequency circuit; wherein each of the plurality of antenna units comprises an antenna oscillator, and the antenna oscillators on each two adjacent antenna units of the plurality of antenna units are misaligned with each other. By disposing antenna oscillators of adjacent antenna units on the misaligned regions of the respective antenna unit, the interference of co-frequency signals between adjacent antenna units may be reduced, and the isolation of adjacent antenna units may be enhanced. Thus, adjacent antenna units may be disposed at a reduced distance therebetween.

Abstract: A method for combining with a minimum isolation bandwidth includes: determining an insertion loss and an isolation between ports of a combiner; calculating a total isolation bandwidth of an isolation band in the combiner according to the insertion loss and the isolation between ports; determining guard bandwidths adjacent to the isolation band in combined systems, the combined systems being at least two communication systems combined by the combiner; and, calculating an actual isolation bandwidth of the combiner according to the guard bandwidths of the combined systems and the total isolation bandwidth.

Abstract: A pitch control system for a wind turbine includes a backup battery bank assigned to each pitch drive motor, with each battery bank having a plurality of individual batteries connected in series. A battery charger is connected in parallel across each battery in the battery bank. A protective circuit is configured with each battery charger and includes a voltage comparator circuit that detects a reverse voltage applied to the battery charger above a threshold value to isolate the battery charger from the reverse voltage.

Abstract: A pitch control system for a wind turbine includes a backup battery bank assigned to each pitch drive motor, with each battery bank having a plurality of individual batteries connected in series. A battery charger is connected in parallel across each battery in the battery bank. A protective circuit is configured with each battery charger and includes a voltage comparator circuit that detects a reverse voltage applied to the battery charger above a threshold value to isolate the battery charger from the reverse voltage.