Abstract: An impact-resistant balanced hydro-cylinder with pressure relief and buffering protection comprises a cylinder body (11), a piston (13), a piston rod (14), and a first valve core (21) and a second valve core (51) slidable relative to the cylinder body (11). A closed first gas cavity (22) and a closed second gas cavity (52) are respectively formed between the two valve cores and inner walls of two opposite ends of the cylinder body (11). A closed first oil cavity (32) and a closed second oil cavity (42) are respectively formed between the two valve cores and two end faces of the piston (13). A through hole (33) for the first oil cavity and a through hole (43) for the second oil cavity are respectively provided in the positions on the cylinder body (11) corresponding to the first oil cavity (32) and the second oil cavity (42).

Abstract: The present disclosure relates to a hydraulic support with a quick response function for coal wall spalling, which includes a base, an upright post, a top beam, an extensible canopy, a face guard, and a vibration meter. The vibration meter is mounted on a hydraulic support, and detects a vibration signal of a coal wall in a non-contact mode. The face guard includes a primary face guard, a secondary face guard, and a tertiary face guard connected in sequence. One side, close to a coal wall, of the primary face guard is connected to a quick response device. The quick response device is in signal communication with the vibration meter. After receiving the vibration signal of the coal wall, the quick response device is abutted against the coal wall before the secondary face guard and the tertiary face guard fit the coal wall.

Abstract: A random access method and apparatus and a device are provided. The method includes: sending a message A in two-step random access. The message A includes a preamble and a Physical Uplink Shared Channel (PUSCH). At least one of related information of the preamble or related information of the PUSCH indicates location-related information of a terminal.

Abstract: This application discloses an information transmission method and apparatus, a device, and a storage medium, and pertains to the communications field. The method is applied to a communications device and includes: obtaining channel quality of a plurality of antennas; determining an antenna working mode according to the channel quality; and performing information transmission by using the antenna working mode, where the antenna working mode includes a MIMO mode, an FTN mode, or a MIMO-FTN mode in which an FTN manner is used for a same intra-antenna port group in the plurality of antennas and a MIMO manner is used for different inter-antenna port groups, where each antenna port group includes at least one antenna.

Abstract: This application discloses an information transmission method and apparatus, a device, and a storage medium. The method is performed by a communications device, and includes: obtaining channel quality of a plurality of antenna channels; and determining an antenna operation mode based on the channel quality, and transmitting information. The antenna operation mode includes: a MIMO mode, an FTN mode, or a MIMO-FTN mode in which the same antenna port group in the plurality of antenna channels operates in a MIMO precoding manner and different antenna port groups operate in an FTN manner, where each antenna port group includes at least one antenna channel.

Abstract: An impact-resistant balanced hydro-cylinder with pressure relief and buffering protection comprises a cylinder body (11), a piston (13), a piston rod (14), and a first valve core (21) and a second valve core (51) slidable relative to the cylinder body (11). A closed first gas cavity (22) and a closed second gas cavity (52) are respectively formed between the two valve cores and inner walls of two opposite ends of the cylinder body (11). A closed first oil cavity (32) and a closed second oil cavity (42) are respectively formed between the two valve cores and two end faces of the piston (13). A through hole (33) for the first oil cavity and a through hole (43) for the second oil cavity are respectively provided in the positions on the cylinder body (11) corresponding to the first oil cavity (32) and the second oil cavity (42).