Abstract: The present disclosure provides a fixed cylinder centrifuge, including a base, a driving device, a screw propeller, a liquid inlet pipe, and a fixed cylinder. The fixed cylinder includes a straight cylinder and a conical cylinder. The straight cylinder and the conical cylinder are communicated with each other and are connected to each other through a first flange. Sand discharging holes are formed in the tail end of the conical cylinder. The screw propeller is rotatabh arranged in the straight cylinder and the conical cylinder and includes a central pipe and a blade. The blade is spirally welded on a pipe wall of the central pipe in an axial direction. A tiny spacing is reserved between the tail end of the blade and the inner wall of the straight cylinder and between the tail end of the blade and the inner wall of the conical cylinder.

Abstract: The present invention provides an active radio frequency identification (RFID) tag and a system and method thereof. The system includes: a coordinator, configured to uninterruptedly and repeatedly transmit a wakeup instruction on a first channel, and a reader/writer, connected to a control processor, and configured to establish communication with the active RFID tag on a second channel after the active RFID tag receives the wakeup instruction, and transmit an action instruction index to the active RFID tag; wherein the active RFID tag comprises: a receiver, configured to receive the wakeup instruction during a time period of an interception state and receive the action instruction index; a processor, configured to store a preset index-action mapping relationship, be waked up according to the wakeup instruction and search out an action instruction corresponding to the action instruction index from the index-action mapping relationship, and execute an operation in response to the action instruction.

Abstract: The present invention provides an active radio frequency identification (RFID) tag and a system and method thereof. The system includes: a coordinator, configured to uninterruptedly and repeatedly transmit a wakeup instruction on a first channel, and a reader/writer, connected to a control processor, and configured to establish communication with the active RFID tag on a second channel after the active RFID tag receives the wakeup instruction, and transmit an action instruction index to the active RFID tag; wherein the active RFID tag comprises: a receiver, configured to receive the wakeup instruction during a time period of an interception state and receive the action instruction index; a processor, configured to store a preset index-action mapping relationship, be waked up according to the wakeup instruction and search out an action instruction corresponding to the action instruction index from the index-action mapping relationship, and execute an operation in response to the action instruction.

Abstract: The present invention provides an active radio frequency identification (RFID) tag and an application system and method thereof. The system includes: a control processor; a coordinator; an active RFID tag, configured to perform an RF feature check first with very little time before spending more time to receive a whole valid data packet during the time period of an interception state; and a reader/writer. Therefore, the power consumption of an active RFID tag is reduced drastically. Further, the present invention also provides an active RFID tag having a plurality of fixed mode actions and the application system and method thereof, thereby improving the communication efficiency of the radio communication system and effectively reducing the probability of signal collision and mutual interference.

Abstract: The present invention provides an active radio frequency identification (RFID) tag and an application system and method thereof. The system includes: a control processor; a coordinator; an active RFID tag, configured to perform an RF feature check first with very little time before spending more time to receive a whole valid data packet during the time period of an interception state; and a reader/writer. Therefore, the power consumption of an active RFID tag is reduced drastically. Further, the present invention also provides an active RFID tag having a plurality of fixed mode actions and the application system and method thereof, thereby improving the communication efficiency of the radio communication system and effectively reducing the probability of signal collision and mutual interference.

Abstract: A system and method for positioning using signal transmit power, SNR of the signal receiving unit, signal receive PER or PLR, and distance relationship between the signal source and receiving unit. The system includes a ranging signal transmitting unit and receiving unit. The transmitting unit continuously transmits a fixed number of ranging signal packets using different transmit powers, and the receiving unit receives the ranging signal packets, collect statistics for the PLR at each transmit power, and calculates the distance between the transmitting unit and itself using the distance relationship. The present invention uses the reference signal source and the method for calculating relative distance to reduce the impact from the noise and environment changes on the positioning, and introduces the critical transmit power to further enhance positioning precision. With the method provided in the present invention, using a common active RFID tag achieves high precision and effective positioning.

Abstract: A system and method for positioning using signal transmit power, SNR of the signal receiving unit, signal receive PER or PLR, and distance relationship between the signal source and receiving unit. The system includes a ranging signal transmitting unit and receiving unit. The transmitting unit continuously transmits a fixed number of ranging signal packets using different transmit powers, and the receiving unit receives the ranging signal packets, collect statistics for the PLR at each transmit power, and calculates the distance between the transmitting unit and itself using the distance relationship. The present invention uses the reference signal source and the method for calculating relative distance to reduce the impact from the noise and environment changes on the positioning, and introduces the critical transmit power to further enhance positioning precision. With the method provided in the present invention, using a common active RFID tag achieves high precision and effective positioning.