Abstract: A low-dropout regulator includes a first power transistor, where the first power transistor is a first NMOS transistor, a drain of the first NMOS transistor is coupled to a power supply end, a source of the first NMOS transistor is configured to provide an output current for a load, and a gate of the first NMOS transistor is configured to receive a second feedback voltage; an error amplifier, where the error amplifier is a common-gate amplifier and is configured to generate a first feedback voltage based on an output voltage provided for the load and a reference voltage; and a loop gain amplifier, where the loop gain amplifier is a common-source amplifier and is configured to generate the second feedback voltage based on the first feedback voltage.

Abstract: Provided are an experimental apparatus and method for regulating and controlling the Zeeman transition of magnetic resonance. The method includes: generating a constant background magnetic field by using a magnetic shielding cylinder, a background magnetic field coil, and a constant current source, and controlling a Larmor precession frequency corresponding to the background magnetic field to be equal to a frequency of a sinusoidal signal output by a radio frequency signal source; adjusting the amplitude of a signal output by a radio frequency signal source of a pump-probe atomic magnetometer to set a radio frequency signal to be a ?/2 pulse or a ? pulse; and then controlling the radio frequency signal source to output a series of sinusoidal radio frequency pulse strings having the same initial phase. The Zeeman transition of magnetic resonance is regulated and controlled by adjusting the time interval between the radio frequency pulse signals.

Abstract: A pure electric modular subsea test tree is provided, which includes a connect-disconnect device, wherein the first channel is formed in the connect-disconnect device; the connect-disconnect device is provided with a locking assembly and a connection drive mechanism for driving the locking assembly, and the first electrical connection plug is embedded in the connect-disconnect device, and the connection drive mechanism is electrically connected with the first electrical connection plug; a shear-seal assembly, wherein a second channel communicated with the first channel is formed in the shear-seal assembly; the shear-seal assembly includes at least one shear-seal device capable of plugging the second channel; a connection part is formed on the shear-seal assembly; a heating device is arranged at one end of the shear-seal device far from the connection part. The disclosure relates to a pure electric modular subsea test tree, which has fast response speed and high operation safety.

Abstract: A method for automatically identifying an active source azimuth of a planet seismometer, comprising: intercepting a three-channel original time sequence in a duration before and after an active source first arrival signal of each support leg received by a planet seismometer in turn; converting the three-channel original time sequence to a horizontal plane based on a pitch angle and a roll angle of the planet seismometer after being deployed to a surface of a planet; converting a time sequence of the horizontal plane to RTZ coordinates and calculating the maximum amplitudes of components of a vibration signal; constructing a target function based on the maximum amplitudes of components of a vibration signal, and scanning an azimuth of the planet seismometer at preset angle intervals, wherein when the target function reaches the minimum, the corresponding azimuth of the planet seismometer is the optimal estimation.

Abstract: A wavefield simulation method for extending the explicit finite-difference stability condition comprises: performing a time-step iteration on the basis of a wave-field numerical simulation model and adopting the spatial filtering method to filter out wave-field components appearing in the high wave number region (S1); when all time-step iterations end, saving wave-field data that obtained from the time iterations (S2); performing the inverse time-dispersion transform on the target wave-field data required to be output from the wave-field data, so as to obtain the wave-field data with time-dispersion removed (S3); and saving the wave-field data after the inverse time-dispersion transform processing (S4). Further provided are an electronic apparatus and a computer-readable storage medium used to implement the wave-field simulation method for extending the explicit finite-difference stability conditions.

Abstract: Embodiments of the present invention disclose a low dropout regulator and a phase-locked loop. The low dropout regulator includes: a reference voltage source, an error amplifier coupled to the reference voltage source, a regulating circuit, a load coupled to the regulating circuit, a first compensation circuit, and a second compensation circuit. The regulating circuit produces a regulating current under control of a control voltage from the error amplifier. The first compensation circuit is coupled between the error amplifier and the regulating circuit. The second compensation circuit is coupled between an input terminal and an output terminal of the regulating circuit.

Abstract: A touch display apparatus is disclosed. The touch display apparatus includes an electrophoretic structure, a protective layer and at least one touch sensing layer. The protective layer is disposed on the electrophoretic structure. The touch sensing layer is disposed on the protective layer and takes the protective layer as a carrier.

Abstract: Embodiments of the present invention disclose a low dropout regulator and a phase-locked loop. The low dropout regulator includes: a reference voltage source, an error amplifier coupled to the reference voltage source, a regulating circuit, a load coupled to the regulating circuit, a first compensation circuit, and a second compensation circuit. The regulating circuit produces a regulating current under control of a control voltage from the error amplifier. The first compensation circuit is coupled between the error amplifier and the regulating circuit. The second compensation circuit is coupled between an input terminal and an output terminal of the regulating circuit.

Abstract: Embodiments of the present invention disclose a low dropout regulator, a method for improving stability of the low dropout regulator, and a phase-locked loop. The low dropout regulator includes: a reference voltage source, an error amplifier, a regulating circuit, a load, a first compensation circuit, and a second compensation circuit. The first compensation circuit is coupled to the regulating circuit, and is configured to regulate a dominant pole and a secondary dominant pole of the low dropout regulator, to regulate a phase margin. The second compensation circuit is configured to: decrease the dominant pole of the low dropout regulator and further increase the secondary dominant pole on the basis that the first compensation circuit has regulated the dominant pole and the secondary dominant pole of the low dropout regulator, so as to regulate the phase margin; and regulate a gain-bandwidth product of the low dropout regulator.

Abstract: Embodiments of the present invention disclose a low dropout regulator, a method for improving stability of the low dropout regulator, and a phase-locked loop. The low dropout regulator includes: a reference voltage source, an error amplifier, a regulating circuit, a load, a first compensation circuit, and a second compensation circuit. The first compensation circuit is coupled to the regulating circuit, and is configured to regulate a dominant pole and a secondary dominant pole of the low dropout regulator, to regulate a phase margin. The second compensation circuit is configured to: decrease the dominant pole of the low dropout regulator and further increase the secondary dominant pole on the basis that the first compensation circuit has regulated the dominant pole and the secondary dominant pole of the low dropout regulator, so as to regulate the phase margin; and regulate a gain-bandwidth product of the low dropout regulator.

Abstract: The present invention provides a seismic signal processing method, device and system. The method comprises: obtaining an offset of a reflected seismic signal at a sampling point and the corresponding reflected wave arrival time; constructing a non-hyperbolic dynamic correction formula based on Pade approximation according to the offset of the reflected seismic signal at the sampling point and the corresponding reflected wave arrival time; extracting a vertical propagation velocity and anisotropy parameters of the reflected seismic signal according to the non-hyperbolic dynamic correction formula constructed based on Pade approximation.

Abstract: The present invention relates to a follow-focus device comprising: a first terminal comprising a first housing, a first control module, a transmitting module electrically connected with the first control module, and a synchronizing wheel rotatably disposed on the first housing and electrically connected with the first control module; and a second terminal comprising a second housing having a chute, a second control module electrically connected with the driving motor 5, a receiving module electrically connected with the second control module and the transmitting module, a driving motor fixed on the second housing and drivingly connected with an adjusting gear, an adjusting gear, and a clamping mechanism slidably disposed in the chute. The position of the clamping mechanism on the second housing can be slidably adjusted according to the scene and different cameras, thus fitness between the second housing and the camera is improved, and the follow-focus adjustment effect is better.

Abstract: A touch display apparatus is disclosed. The touch display apparatus includes an electrophoretic structure, a protective layer and at least one touch sensing layer. The protective layer is disposed on the electrophoretic structure. The touch sensing layer is disposed on the protective layer and takes the protective layer as a carrier.

Abstract: It is provided a method and a device for acquiring optimization coefficients, and a related method and device for simulating a wave field. Determining whether the values of a discrete variable Kx(i) in the finite difference scheme controlled by the current temporary coefficients {Bn} meet a first condition, the current temporary coefficients {Bn} meeting the condition are selected and are added into a result to be selected; searching for a maximum current discrete value of the discrete variable Kx(i) in the finite difference scheme controlled by the current temporary coefficients {Bn} with the maximum current discrete value satisfying a condition that the values of the discrete variable Kx(i) meet the first condition to determine an accuracy coverage range, and selecting a set of current temporary coefficients {Bn} having the maximum accuracy coverage range as the first-type optimization coefficients {bn}, the first-type optimization coefficients {bn} are found to serve as the optimization coefficients.

Abstract: The present disclosure relates to a touch-sensitive device and a fabricating method thereof, and more particularly, to a touch-sensitive display device and the method for fabricating the same. The touch-sensitive display device including a display panel, a touch-sensitive panel, and a plurality of supporting bumps is located between the display panel and a touch-sensitive panel. The supporting bumps have elasticity to keep the touch-sensitive panel separated from the display panel.