Abstract: The present disclosure belongs to the technical field of seismic exploration, and specifically relates to a method, device, apparatus and storage medium for migration imaging of scattered waves. A method for the migration imaging of scattered waves includes: acquiring a scattered wave data volume and one or more velocity models; performing a coherent migration operation on the scattered wave data volume to generate a coherent migration operator corresponding to the scattered wave data volume; generating one or more respective integral paths based on the one or more velocity models; associating the coherent migration operator with the one or more integral paths respectively to determine one or more respective coherent migration results; and superimposing the one or more respective coherent migration results to obtain a migration imaging result.

Abstract: A radio frequency power amplifier circuit includes a controllable attenuation circuit, an input matching circuit, a drive amplification circuit, an inter-stage matching circuit, a power amplification circuit and an output matching circuit connected in sequence, and respectively configured to switch between a negative gain mode and a non-negative gain mode of the radio frequency power amplifier circuit based on a mode control signal, match the impedance between the controllable attenuation circuit and the drive amplification circuit, amplify a signal, configured to match the impedance between the drive amplification circuit and the power amplification circuit, amplify a signal, and match the impedance between the radio frequency power amplifier circuit and a post-stage circuit. A feedback circuit is connected across the drive amplification circuit, and is configured to adjust a gain.

Abstract: An overvoltage protection and gain bootstrap circuit of a power amplifier includes a power amplification transistor, and a diode reversely connected with a gate of the power amplification transistor. A negative electrode of the diode is connected with the gate of the power transistor, and a positive electrode of the diode is connected with a constant voltage source, such that a function of overvoltage protection and gain bootstrap of the circuit is realized by controlling a turn-on state of the diode. By adding a diode device to the circuit, gate-drain overvoltage protection for the power amplification transistor can be provided, and the gain of the amplifier can be improved before power compression, thereby improving linearity of the power amplifier. The structure of the circuit can be simple, with reduced occupied area hardware cost.

Abstract: An overvoltage protection and gain bootstrap circuit of a power amplifier includes a power amplification transistor, and a diode reversely connected with a gate of the power amplification transistor. A negative electrode of the diode is connected with the gate of the power transistor, and a positive electrode of the diode is connected with a constant voltage source, such that a function of overvoltage protection and gain bootstrap of the circuit is realized by controlling a turn-on state of the diode. By adding a diode device to the circuit, gate-drain overvoltage protection for the power amplification transistor can be provided, and the gain of the amplifier can be improved before power compression, thereby improving linearity of the power amplifier. The structure of the circuit can be simple, with reduced occupied area hardware cost.

Abstract: A radio frequency power amplifier circuit includes a controllable attenuation circuit, an input matching circuit, a drive amplification circuit, an inter-stage matching circuit, a power amplification circuit and an output matching circuit connected in sequence, and respectively configured to switch between a negative gain mode and a non-negative gain mode of the radio frequency power amplifier circuit based on a mode control signal, match the impedance between the controllable attenuation circuit and the drive amplification circuit, amplify a signal, configured to match the impedance between the drive amplification circuit and the power amplification circuit, amplify a signal, and match the impedance between the radio frequency power amplifier circuit and a post-stage circuit. A feedback circuit is connected across the drive amplification circuit, and is configured to adjust a gain.

Abstract: The present invention is related to a replenishment method and device in an assembly line. A usage storage area for storing a first object set and a spare storage area for storing a second object set are defined in the replenishment apparatus. The replenishment apparatus comprises a fixing carrier in the usage storage area and a moving carrier in the spare storage area. The replenishment method comprises driving the moving carrier to move the second object set in the spare usage area to the fixing carrier in the usage storage area when a remaining number of objects in the first object set carried in the fixing carrier is zero and the first object set in the fixing carrier is removed; and moving the moving carrier to leave the fixing carrier and recover to the spare usage area.

Abstract: The present invention is related to a replenishment method and device in an assembly line. A usage storage area for storing a first object set and a spare storage area for storing a second object set are defined in the replenishment apparatus. The replenishment apparatus comprises a fixing carrier in the usage storage area and a moving carrier in the spare storage area. The replenishment method comprises driving the moving carrier to move the second object set in the spare usage area to the fixing carrier in the usage storage area when a remaining number of objects in the first object set carried in the fixing carrier is zero and the first object set in the fixing carrier is removed; and moving the moving carrier to leave the fixing carrier and recover to the spare usage area.

Abstract: An ergonomic pillow includes a body having a top with upper, middle, and lower stepped portions descending from the rear to the front thereof, and a transverse, elongated support member arranged between the upper and middle stepped portions. The pillow is usable for supporting a supine person for sleeping, so that the head is supported on the upper stepped portion, the neck is supported on the elongated support member, the shoulders are supported on the middle and lower stepped portions. Thus the head is tilted back slightly relative to the back, so as to promote shortening and relaxation of the muscles on the back of the neck and shoulders. The pillow is also usable for supporting a person sleeping sideways, so that a shoulder is supported on the middle and lower stepped portions, and the head is supported on the elongated support member in a comfortable, natural position.

Abstract: An adjustable back support device comprises a seat cover snugly enclosing the seat back of a car seat, and a basic set of three cushions. The seat cover and the shells of the cushions are made of fastening-loop fabric. The cushions also include fastening-hook strips disposed thereon, so that they can be individually attached to the seat cover for supporting different parts of a user's body, such as the neck, upper back, and lumbar area. The cushions can be easily and precisely positioned to suit individual users, and can be attached anywhere on the seat cover for supporting other parts of a user's body. Fewer or more cushions can be used if desired to suit individual preferences.