Abstract: Disclosed are a method and system for detecting a complex multi-step attack in an electric power system. The method includes: collecting interaction behavior data of a network entity; preprocessing the interaction behavior data of the network entity based on a heterogeneous graph to obtain input data; and inputting the input data into a complex multi-step attack detection module to obtain an attack detection result. Information is extracted from the interaction behavior data to construct a node and an edge of the heterogeneous graph. Timestamp information of a destination node and an adjacent source node of the destination node is input into a Time2Vec layer to obtain a first time embedding representation. Data that fuses node feature information and the first time embedding representation is input into a Heteformer layer, and a second node embedding representation is obtained as input data and input into the complex multi-step attack detection module.

Abstract: The invention provides a method for increasing wear resistance of a surface of a crankshaft, including: dividing a journal of a crankshaft into a journal coating portion and two journal grinding portions located on two sides of the journal coating portion; the surface of the journal grinding portion is higher than that of the journal coating portion, and higher than the surface of the journal of a finished crankshaft, the surface of the rounded corner of the crankshaft is higher than that of the rounded corner of the finished crankshaft, and the size of the journal coating portion is smaller than that of the journal of the finished crankshaft; and spraying a ceramic coating on the surface of the journal coating portion, grinding the surfaces of the journal and the rounded corner until the ceramic coating and the surface of the rounded corner are seamlessly joined, and performing polishing.

Abstract: A flow splitting device for gas reverse circulation drilling, including: an upper joint for connecting with a double-wall drill pipe; an inner tube which is arranged in the upper joint and defines a first passageway in communication with an inner chamber of the double-wall drill pipe, a second passageway in communication with an annular space in the double-wall drill pipe formed between the inner tube and the upper joint; a lower joint, having an upper end fixedly connected with the upper joint and a lower end for connecting with a drill tool; and a flow guiding member provided between the upper joint and the lower joint. A flexible sealing mechanism is provided outside the upper joint. The flexible sealing mechanism extends radially outward relative to the upper joint and the lower joint to form a sealing contact with a wellbore wall.

Abstract: A method for determining a productivity of a coalbed methane well without shutting down the well includes steps of: obtaining coalbed methane basic data; based on PVT experimental data, determining a relationship table between a pressure and a coalbed methane deviation factor, and a relationship table between the pressure and a pseudo-pressure; recording daily gas production rates, bottomhole flow pressures, and cumulative gas productions at each stabilized flow pressure test moment in at least three different production stages; determining formation pressures corresponding to each stabilized flow pressure test moment based on a material balance equation; according to the formation pressures, the bottomhole flow pressures and the production rates, determining coefficients in a deliverability equation of the coalbed methane well for determining the deliverability equation; substituting the formation pressures and the bottomhole flow pressures into the deliverability equation for obtaining corresponding product

Abstract: In various aspects, the invention provides methods of modifying plant development using cyclin-dependent kinase (CDK) inhibitors, cyclins and proteins that bind to CDK inhibitors, including methods of genetic modification utilizing nucleic acids encoding such proteins. In alternative aspects, the invention may provide methods of plant breeding that facilitate the modulation of plant phenotype in alternative generations. The invention may also provide plants produced by the methods of the invention, including transgenic plants having recombinant genomes that include heterologous sequences encoding CDK inhibitors, cyclins and proteins that bind to CDK inhibitors.