Abstract: A fracturing apparatus is provided. The fracturing apparatus includes a plunger pump, a transmission shaft, a main motor, an oil pipe, a first radiator and a noise reduction cabin. The main motor is spaced apart from the plunger pump, the plunger pump is connected with the main motor through the transmission shaft; the oil pipe is configured to be connected with the plunger pump; the first radiator is spaced apart from the plunger pump, the first radiator is configured to dissipate heat from oil in the oil pipe, the main motor, the first radiator and at least part of the oil pipe are all located inside the noise reduction cabin, and the plunger pump is located outside the noise reduction cabin.

Abstract: A fracturing apparatus may include a first plunger pump including a first power end and a first hydraulic end; a prime mover including a first power output shaft; and a first clutch including a first connection portion and a second connection portion. The first power end of the first plunger pump includes a first power input shaft, the first connection portion is coupled to the first power input shaft, the second connection portion is coupled to the first power output shaft of the prime mover.

Abstract: The present application discloses a method and a device for user grouping and resource allocation in a NOMA-MEC system. The hybrid deep reinforcement learning algorithm proposed in the present application solves the hybrid problem of deep reinforcement learning that is difficult to deal with both discrete and continuous action spaces by using DDPG to optimize continuous actions and DQN to optimize discrete actions. Specifically, the algorithm determines a bandwidth allocation, an offloading decision, and a sub-channel allocation (user grouping) of the user device based on the user's channel state, in order to maximize the ratio of the computation rate to the consumed power of the system. The algorithm is well adapted to the dynamic characteristics of the environment and effectively improves the energy efficiency and spectrum resource utilization of the system.

Abstract: A fracturing apparatus includes a motor, a first plunger pump, a power supply platform, a gas turbine engine, a generator, and one or more rectifiers. At least two of the gas turbine engine, the generator, and the one or more rectifiers are arranged on the power supply platform. A first end of the generator is connected to the gas turbine engine. A second end of the generator is connected to the one or more rectifiers. The generator is configured to output a voltage to the one or more rectifiers. The one or more rectifiers are configured to provide power to the motor. The motor is configured to drive the first plunger pump.

Abstract: A processor-implemented method including extracting initial feature maps from respective images extracted from a video, wherein the extracting of the initial features maps is performed using a transformer, generating a target feature map by fusing the initial feature maps using a feature fusion network including one or more layers, and identifying an object in the video based on the target feature map.

Abstract: The present disclosure relates to the field of medical equipment, and provides an intelligent thrombus aspiration system, including a negative pressure suction pump, a blood collection tank, a thrombus aspiration connection unit, a suction catheter and a man-machine interaction module. The man-machine interaction module is configured to transmit a target catheter diameter of the suction catheter to the thrombus aspiration connection unit in response to a command for selecting the target catheter diameter.

Abstract: Methods for catalyzing C—H insertion reactions using heme enzymes are described. The present disclosure provides a method for producing a C—H insertion product comprising providing an substrate having an sp3-hybridized C—H bond, a carbene precursor such as a diazo reagent, and a heme enzyme, and admixing the components in a reaction for a time sufficient to produce the C—H insertion product. Heme enzyme variants useful for carrying out in vivo and in vitro C—H insertion reactions, as well as expression vectors and host cells expressing the heme enzymes, are also described.

Abstract: A media file presentation method is disclosed, applicable to an application client and performed at a computing device. The computing device performs a blocking operation on a process of switching from a background state to a suspended state and covers a page screenshot by using a to-be-presented media file in the process of switching from the background state to the suspended state, the page screenshot being captured in a process of switching from a foreground state to the background state. Finally, the computing device presents the media file covering the page screenshot in a process of switching from the suspended state to the foreground state.

Abstract: Methods for catalyzing C—H insertion reactions using heme enzymes are described. The present disclosure provides a method for producing a C—H insertion product comprising providing an substrate having an sp3-hybridized C—H bond, a carbene precursor such as a diazo reagent, and a heme enzyme, and admixing the components in a reaction for a time sufficient to produce the C—H insertion product. Heme enzyme variants useful for carrying out in vivo and in vitro C—H insertion reactions, as well as expression vectors and host cells expressing the heme enzymes, are also described.

Abstract: A media file presentation method is disclosed, applicable to an application client and performed at a computing device. The computing device performs a blocking operation on a process of switching from a background state to a suspended state and covers a page screenshot by using a to-be-presented media file in the process of switching from the background state to the suspended state, the page screenshot being captured in a process of switching from a foreground state to the background state. Finally, the computing device presents the media file covering the page screenshot in a process of switching from the suspended state to the foreground state.

Abstract: Disclosed is a method and device for reporting mobile terminal behaviors, including: acquiring a configuration information from a server in a preset time interval continuously; determining whether the configuration information acquired before and after the preset time interval is the same; if it is the same, then prolonging the preset time interval by a modified duration; if it is different, then resetting the preset time interval to the initial duration; and monitoring a user's behavior according to the configuration information, when an occurrence of the user's behavior is monitored, acquiring the behavior data of the user's behavior from local and reporting the behavior data to the server.

Abstract: The present invention provides methods for catalyzing the conversion of an olefin to a compound containing one or more aziridine functional groups using heme enzymes. In certain aspects, the present invention provides a reaction mixture for producing an aziridination product, the reaction mixture comprising of an olefinic substrate, a nitrene precursor, and a heme enzyme. In other certain aspects, the present invention provides a method for producing an aziridination product comprising providing an olefinic substrate, a nitrene precursor, and a heme enzyme; and admixing the components in a reaction for a time sufficient to produce an aziridine product. In other aspects, the present invention provides heme enzymes including variants and fragments thereof that are capable of carrying out in vivo and in vitro olefin aziridination reactions. Expression vectors and host cells expressing the heme enzymes are also provided by the present invention.