Abstract: A channel state information feedback method and a communication apparatus. A network device sends reference signal configuration information to a terminal device, where the reference signal configuration information is usable for configuring N_1 reference signals, and the N_1 reference signals correspond to N antenna ports. The terminal device determines K_1 first channel vectors based on K_1 combination matrices and measurement results of the N_1 reference signals on the N antenna ports, where an ith combination matrix in the K_1 combination matrices is usable for combining the N antenna ports into M_i antenna ports; the terminal device further obtains K_1 pieces of channel state information CSI based on the K_1 first channel vectors. Then, the terminal device sends K_2 pieces of CSI in the K_1 pieces of CSI to the network device.

Abstract: A communication method and apparatus. for indicating indicate A terminal is indicated to perform second transmission when an SSB or a PRACH on a frequency domain resource overlaps with reverse transmission on another frequency domain resource in time domain. In response to the SSB or the PRACH overlapping with the second transmission in time domain, the terminal device determines, by receiving first indication information, that a priority of the SSB or the PRACH is lower than a priority of the second transmission on an overlapped time domain resource. The terminal device performs the second transmission based on the first indication information. The terminal device performs reverse transmission on a symbol that overlaps with the SSB or the PRACH.

Abstract: In a signal transmission method and apparatus, a network device sends scheduling information of at least one of two carriers whose communication directions are opposite on a target OFDM symbol; a terminal device performs channel transmission of a target carrier on the target OFDM symbol based on the scheduling information, where the target carrier is one of carriers that are of the two carriers whose communication directions are opposite and that have channel transmission on the target OFDM symbol; and the network device performs channel transmission on the target OFDM symbol and the target carrier. A time domain resource may be allocated to a carrier on which transmission scheduling is currently performed, thereby improving transmission resource utilization and reducing a waiting delay.

Abstract: This application provides a cell access method, a communication apparatus, and a computer storage medium. The method includes: A network device sends one or more reference signals to a terminal. The terminal sends corresponding first indication information to the network device based on a first reference signal in the received one or more reference signals, where the first indication information indicates the network device to send a downlink common signal, so that the terminal may access a target cell based on the downlink common signal.

Abstract: Provided is a method for reducing methane production in animal stomachs by adding melatonin to gastric juice of the animal or feeding the animal with melatonin. In the method of the present disclosure, 10?7 mol/L to 10?3 mol/L of melatonin can reduce the methane production from the in vitro gastric fermentation fluid, feeding melatonin of 8.0 to 35.0 mg/kg/day can reduce the methane production from the animal respiration from day 7 of feeding melatonin. The method of the present disclosure can reduce greenhouse gas emissions of animals, control environmental pollution and realize low-carbon farming.

Abstract: Disclosed is a composition for increasing pregnancy rate in ruminants exposed to ovsynch and timed artificial insemination, and a preparation method and application thereof. The effective component of the composition is melatonin with a concentration of 10-20 mg/mL. The present disclosure proves through animal experiments that the use of the composition of the present disclosure in combination with the last injection of GnRH in an ovsynch and timed artificial insemination protocol for a ruminant can regulate the secretion of reproductive hormones in an animal body, increase the levels of luteinizing hormone (LH) and progesterone in pregnant females, and improve ovum quality and facilitate ovulation, thus increasing the pregnancy rate in ruminants exposed to ovsynch and timed artificial insemination.