Abstract: The present invention discloses a method for UAV path planning in urban airspace based on a safe reinforcement learning (RL) algorithm called shield-DDPG, which combines a shield model with a DDPG algorithm and pertains to the field of UAV technologies. The method takes an attractive force from the destination point into account when an action is selected, which improves the convergence speed of the algorithm and also improve the efficiency of UAV path planning. More importantly, the method provided by the present invention can effectively verify safety of an action in terms of the air collision risk and the ground impact risk, and ensure that a final output of the algorithm is a safe optimal solution. Therefore, the present invention can effectively solve the problem that when the RL algorithm is used for UAV path planning, it is difficult to ensure the safety of the learning or execution process due to the lack of hard constraints.

Abstract: The present invention discloses a method for UAV path planning in urban airspace based on a safe reinforcement learning (RL) algorithm called shield-DDPG, which combines a shield model with a DDPG algorithm and pertains to the field of UAV technologies. The method takes an attractive force from the destination point into account when an action is selected, which improves the convergence speed of the algorithm and also improve the efficiency of UAV path planning. More importantly, the method provided by the present invention can effectively verify safety of an action in terms of the air collision risk and the ground impact risk, and ensure that a final output of the algorithm is a safe optimal solution. Therefore, the present invention can effectively solve the problem that when the RL algorithm is used for UAV path planning, it is difficult to ensure the safety of the learning or execution process due to the lack of hard constraints.

Abstract: Provided in the present invention are a method for constructing a strain for producing a recombinant protein containing unnatural amino acids, and the strain obtained therefrom. The method comprises modifying the expression of a prfA gene contained in the strain to be controllable. The strain constructed by the method of the present invention can efficiently produce in intact protein containing unnatural amino acids, greatly reduce the production of a truncated protein and can also maintain high-speed growth.

Abstract: A data synchronization device is provided, including a control module, a data block storage module and an encoding/decoding module. A data synchronization method using the device is also provided, including: selecting, by the control module, a data transmission network node and selecting the to-be-synchronized data block of a data transmission network node from the data storage module; encapsulating the to-be-synchronized data block in a specific format and then broadcasting the encapsulated data, where if there are two or more to-be-synchronized data blocks, the to-be-synchronized data blocks are encoded and then encapsulated; otherwise, the to-be-synchronized data block is directly encapsulated; processing, by the encoding/decoding module, the encapsulated data to obtain the to-be-synchronized data block, and finally inputting the obtained to-be-synchronized data block into the data block storage module.

Abstract: Disclosed are a method and device for implementing an ad hoc network routing protocol in a multi-agent system. The device includes a trajectory information acquisition module, a data packet delivery module, a delivery confirmation module, a data packet forwarding module, a data transmission feedback module and a data storage module. The method includes: acquiring a separation and rendezvous timing table and an adjacency matrix of an ad hoc network composed of multiple agents at a given moment; if a source node has message sending requirement, performing data packet delivery and delivery confirmation based on the separation and rendezvous timing table and the adjacency matrix; and performing data packet forwarding and transmission status feedback by a non-source node.

Abstract: A data synchronization device is provided, including a control module, a data block storage module and an encoding/decoding module. A data synchronization method using the device is also provided, including: selecting, by the control module, a data transmission network node and selecting the to-be-synchronized data block of a data transmission network node from the data storage module; encapsulating the to-be-synchronized data block in a specific format and then broadcasting the encapsulated data, where if there are two or more to-be-synchronized data blocks, the to-be-synchronized data blocks are encoded and then encapsulated; otherwise, the to-be-synchronized data block is directly encapsulated; processing, by the encoding/decoding module, the encapsulated data to obtain the to-be-synchronized data block, and finally inputting the obtained to-be-synchronized data block into the data block storage module.

Abstract: Disclosed are a method and device for implementing an ad hoc network routing protocol in a multi-agent system. The device includes a trajectory information acquisition module, a data packet delivery module, a delivery confirmation module, a data packet forwarding module, a data transmission feedback module and a data storage module. The method includes: acquiring a separation and rendezvous timing table and an adjacency matrix of an ad hoc network composed of multiple agents at a given moment; if a source node has message sending requirement, performing data packet delivery and delivery confirmation based on the separation and rendezvous timing table and the adjacency matrix; and performing data packet forwarding and transmission status feedback by a non-source node.

Abstract: The invention discloses a protective device for the occurrence of a mine roof fall, which includes a machine body. A load-bearing cavity 72 is provided in the machine body 10, a load-bearing platform 11 is fixedly arranged on the lower side of the machine body 10, and four circumferences of the machine body 10 are evenly distributed on the outside. The cavity 69 and the load-bearing cavity 72 are provided with a weight-bearing device 75 for lifting a weight. The weight-bearing device can withstand the falling top plate, and the hydraulic cylinder therein can make the device bear the pressure of the top plate on the device and fix the device at the same time. The stabilizing device can keep the device in a stable state under the action of pressure, will not fall, and share part of the pressure. The load-bearing device can support the device to support the pressure on the roof of the mine and drill into the ground.

Abstract: A thermally insulating protective sleeve. The thermally insulating protective sleeve comprises a tubular shell and a thermally insulating liner located in the tubular shell and made of a thermally insulating soft material. The shell comprises two longitudinally separated half-parts, the two half-parts being detachably connected to each other. The thermally insulating liner defines a hollow opening in the shell, and an object to be thermally insulated can be received in the hollow opening in such a way that the thermally insulating liner is subjected to pressure in a radial direction.

Abstract: A gas pressure tank structure including: a tank wall, a compression oil cylinder, a locking ring, a spring cylinder, a locating pin mounting hole, a dowel pinhole, a refractory brick, a guide mechanism, a sealing structure, an arc joint, an arc shaped tank bottom, a steel ladle stand, a tank cover, and a reinforcing board.

Abstract: A thermally insulating protective sleeve. The thermally insulating protective sleeve comprises a tubular shell and a thermally insulating liner located in the tubular shell and made of a thermally insulating soft material. The shell comprises two longitudinally separated half-parts, the two half-parts being detachably connected to each other. The thermally insulating liner defines a hollow opening in the shell, and an object to be thermally insulated can be received in the hollow opening in such a way that the thermally insulating liner is subjected to pressure in a radial direction.

Abstract: A gas pressure tank structure including: a tank wall, a compression oil cylinder, a locking ring, a spring cylinder, a locating pin mounting hole, a dowel pinhole, a refractory brick, a guide mechanism, a sealing structure, an arc joint, an arc shaped tank bottom, a steel ladle stand, a tank cover, and a reinforcing board.

Abstract: The present invention relates to a compound of formula (I) or isomers thereof, or pharmaceutically acceptable salts or hydrates thereof. The present invention further relates to processes for the preparation of the compounds of formula (I) and optical isomers, and to the use of the compounds of formula (I), or isomers thereof, or pharmaceutically acceptable salts or hydrates thereof as medicaments, in particular as medicaments for the treatment and prevention of Hepatitis B.

Abstract: The present invention relates to compounds of the formula (I) or pharmaceutically acceptable salts or hydrates thereof. The present invention further relates to processes for the preparation of the compounds of formula (I) and optical isomers and to use of the compounds of formula (I), isomers, pharmaceutically acceptable salts or hydrates thereof as medicaments, in particular as medicaments for the treatment and prevention of Hepatitis B.

Abstract: The present invention relates to a compound of formula (I) or isomers thereof, or pharmaceutically acceptable salts or hydrates thereof. The present invention further relates to processes for the preparation of the compounds of formula (I) and optical isomers, and to the use of the compounds of formula (I), or isomers thereof, or pharmaceutically acceptable salts or hydrates thereof as medicaments, in particular as medicaments for the treatment and prevention of Hepatitis B.

Abstract: The present invention relates to compounds of the formula (I) or pharmaceutically acceptable salts or hydrates thereof. The present invention further relates to processes for the preparation of the compounds of formula (I) and optical isomers and to use of the compounds of formula (I), isomers, pharmaceutically acceptable salts or hydrates thereof as medicaments, in particular as medicaments for the treatment and prevention of Hepatitis B.

Abstract: HD4 polypeptides and polynucleotides and methods for producing such polypeptides by recombinant techniques are disclosed. Also disclosed are methods for utilizing HD4 polypeptides and polynucleotides in therapy, and diagnostic assays for such.