Abstract: Provided in the present application are a positioning method and apparatus, and a terminal and a storage medium. On a first terminal side, the positioning method includes: acquiring positioning service information of a target terminal; determining from the target terminal, according to the positioning service information, a primary positioning terminal for providing a primary positioning service and a secondary positioning terminal for providing a secondary positioning service; and performing positioning for a location of a first terminal based on the primary positioning terminal and the secondary positioning terminal. Since the positioning of the first terminal can be assisted by the primary positioning terminal and the secondary positioning terminal, the location of the first terminal can be accurately positioned even if a network coverage area where the first terminal is located does not have a proper positioning server therein to provide a positioning service.

Abstract: A native leaflet treatment system and method for treating native heart valve leaflets before heart valve repair or replacement procedure. The treatment system includes a delivery apparatus configured to enter the heart, and a native leaflet treatment device stored in the delivery apparatus in a compressed state. The treatment device includes a clamping structure, which is configured to retain at least a portion of the native leaflets in the deployed state. The treatment device is delivered into the heart using the delivery apparatus, and released near the native heart valve, where the treatment device expands and the clamping structure captures and holds the native leaflet, such that the native leaflets will no longer block blood flow. This improves the dynamics of the blood flow which facilitates subsequent surgical procedures (minimally-invasive surgery or open surgery) for heart valve repair or replacement.

Abstract: Embodiments of the present disclosure provide an antenna device and a base station comprising the same. The antenna device may comprise an antenna array with a radiation pattern including a main lobe and a back lobe; and a first reflector able to be configured to reflect a first part of energy of the back lobe to at least one direction different from a direction of the main lobe.

Abstract: Embodiments of the present disclosure provide method and apparatus for positioning. The method may comprise receiving a first radio signal of a terminal device located in the area from a line of sight (LOS) path between the antenna array and the terminal device; receiving a second radio signal of the terminal device located in the area from at least one path reflected by the reflector; determining respective angles of arrival of the LOS path and the at least one path reflected by the reflector; and determining a location of the terminal device by using triangulation based on the respective angles of arrival.

Abstract: Embodiments of the present disclosure provide an antenna device and a base station comprising the same. The antenna device may comprise an antenna array with a radiation pattern including a main lobe and a back lobe; and a first reflector able to be configured to reflect a first part of energy of the back lobe to at least one direction different from a direction of the main lobe.