Abstract: A three-port LLC resonant converter and power conversion system bidirectionally transfers power among three ports, each operable as a source or a load. The converter comprises a primary-side switching network at a first port driving a transformer, and secondary-side resonant tanks at second and third ports, the transformer providing galvanic isolation and voltage gain. The system includes a controller configured to monitor port voltages and power and to generate gate-drive signals that regulate power flow between an input port and at least one output port via switching-frequency control. Cross-regulation allows one port to be trimmed while maintaining another substantially constant. Implementations include full-bridge and voltage-doubler rectification on the secondary side and support soft switching to reduce losses, with multi-phase transformer variants to distribute conduction and thermal stress and scale power capability.

Abstract: The present disclosure provides a data writing method and a memory controller, adapted for a rewritable non-volatile memory module having a plurality of memory cells. The method comprises the following steps: first, obtaining original data from a host system. Then, performing a plurality of randomization operations on the original data to obtain a plurality of write data. Next, based on a plurality of directions of a three-dimensional circuit architecture of the rewritable non-volatile memory module, performing a randomization verification operation on each write data to obtain a target write data from the plurality of write data, wherein a quality of randomization of the target write data is determined to be qualified. Finally, storing the target write data into a plurality of target memory cells among the plurality of memory cells. Through multiple randomization operations and a verification process, the present disclosure effectively improves the randomness and reliability of data storage.

Abstract: The present disclosure provides a testing device and evaluation method for the entire process of borehole deformation-crack evolution of coal mass, which relates to the technical field of coal borehole deformation testing. The testing device includes a loading mechanism and a monitoring mechanism; the loading mechanism includes an outer frame, a bearing plate, a loading cylinder, a spacer block, and a coal specimen; the monitoring mechanism includes an industrial camera, an acoustic emission detector, and an information acquisition unit. This testing device uses high-strength transparent material bearing plate to achieve visual observation; for monitoring the status of borehole, a borehole deformation monitoring sensor or a miniature camera can be selected to achieve the entire process testing of borehole from deformation to closure.

Abstract: The present disclosure provides a data writing method and a memory controller, adapted for a rewritable non-volatile memory module having a plurality of memory cells. The method includes the following steps: First, obtaining original data from a host system. Then, performing a plurality of randomization operations on the original data to obtain a plurality of write data. Next, performing a first randomization verification operation on each of the write data to obtain a target write data from the plurality of write data, wherein the quality of randomization of the target write data is determined to be qualified. Finally, storing the target write data into a plurality of target memory cells among the plurality of memory cells. The present disclosure, through multiple randomization operations and a verification process, effectively improves the randomness and reliability of data storage, so as to enhance the overall performance and data security of the storage system.

Abstract: A system and method is proposed for constant-on time control of a converter for regulation of an output DC voltage. The system and method include a converter having a transformer with a primary side coupled in series with a switching network having at least two switches, where a switching frequency is set for the switches to regulate the output DC voltage, and the switching frequency has a corresponding switching period. The switches are modulated 180 degrees out of phase between an on-state and an off-state, and the switches are kept in the on-state for a fixed time duration that is at most half the switching period.

Abstract: The present disclosure discloses an active perception system for a double-axle steering cab-less mining vehicle. The adaptive perception system includes: an environment perception mapping module, a single-frame target detection module, a multi-frame data association module, a cloud control platform, a decision-making and planning module, and a vehicle control module. The double-axle steering autonomous driving mining vehicle can be actively adjusted to be in a forward advancing mode or a backward advancing mode according to the driving mode and comprehensive information of a sensor. The system improves working efficiency of mining area, and solves the problems of large perception blind area and high risk during turning, uphill and downhill of an existing autonomous driving perception system.

Abstract: A fluorescence immunoassay device based on integration of a photonic crystal and magnetic beads and a method thereof are provided. Magnetic beads with high surface-to-volume ratio are used as carriers of fluorescent molecules to obtain higher fluorescence density. The electric field on the surface of the photonic crystal is enhanced through excitation of photonic crystal resonance. The intensity of the fluorescence signal excited by the enhanced electric field is increased. Moreover, through interaction with the photonic crystal, some fluorescent signals that originally cannot be received by the fluorescent sensor are coupled to the photonic crystal resonant modes and reradiate toward the fluorescent sensor, thereby increasing collection efficiency. The fluorescence signals generated by fluorescent molecules on the magnetic beads are significantly intensified, which could lower the detection limit.

Abstract: The present disclosure relates to the technical field of water electrolysis, in particular to a low-hydrogen-permeability proton exchange membrane as well as a preparation method and use thereof. The proton exchange membrane comprises a Pt-based additive layer and a substrate membrane, wherein the Pt-based additive layer consists of a Pt-based additive and a fluorinated proton exchange resin and comprises an array layer and a flat layer, with the thickness ratio and active components ratios of the array layer to the flat layer ranging from 1:(0.5-30) to 1:(1-50), and the array layer is composed of an orderly arranged arrays and an array layer resin wrapping the arrays. The low-hydrogen-permeability proton exchange membrane provided by the present disclosure has the Pt-based additive layer composed of the array layer and the flat layer.

Abstract: Systems and methods for a lithium-ion battery cell are disclosed. In one example, a method for forming a cathode for a lithium-ion battery cell includes forming a pre-lithiated cathode with a pre-lithiation reagent and positioning the pre-lithiated cathode in contact with an electrolyte. An electrolyte additive is injected into the electrolyte to form a passivation layer at the pre-lithiated cathode, the passivation layer inhibiting continued decomposition of the pre-lithiation reagent of the pre-lithiated cathode after completion of a formation cycle of the lithium-ion battery cell.

Abstract: Provide is a friction pair device comprising a friction pair stationary member, a plurality of micro channels, a Tesla valve structure, and a stress application device. The friction pair stationary member includes a friction pair static surface, which friction pair static surface is provided with a dynamic pressure groove. The dynamic pressure groove includes a dynamic pressure groove bottom. A surface of the dynamic pressure groove bottom is provided with micro-nano scale gaps. A super-lubricant is injected into the gaps to form a super-lubricant layer, allowing liquid medium molecules of a liquid-film to move freely along the dynamic pressure groove bottom. A slip velocity of the liquid medium molecules approaches a moving velocity of a friction pair dynamic surface, a slip length of the liquid medium molecules approaches positive infinity, and a super slip surface is formed on the dynamic pressure groove bottom.

Abstract: The present application provides a surface covering product comprising a surface ornamental layer, a buffer layer, a supporting layer, and a backing layer. The surface ornamental layer has a top surface and a bottom surface. The buffer layer is made from a porous material with a top surface and a bottom surface. The supporting layer is made from a foamed polymeric material with a top surface and a bottom surface. The backing layer has a top surface and a bottom surface. The bottom surface of the surface ornamental layer is attached to the upper surface of the buffer layer, the bottom surface of the buffer layer is attached to the top surface of the supporting layer, and the bottom surface of the supporting layer is attached to the top surface of the backing layer.

Abstract: A modular horizontal channel steel beam connection device is disclosed, pertaining to the technical field of prefabricated building structures. The device comprises an I-shaped stiffener, and a vertical force reinforcement module mounted in a mounting groove, wherein top four corners of the I-shaped stiffener are provided with threaded holes corresponding to the vertical force reinforcement module and the top of the vertical force reinforcement module is fixed in the reinforcement module mounting groove by fixing bolts. By adopting a modular horizontal channel steel beam connection configuration, the disclosed beam connection device can solve the problems of low construction efficiency, stress concentration at the joints and poor modular adaptability caused by insufficient standardization of connection interfaces, and by discontinuous force transmission paths in existing connection devices, thereby enhancing structural integrity and seismic performance of prefabricated steel beams.

Abstract: A boltless connection device for upper and lower modular beams of a steel structure modular building is disclosed, comprising a geared reinforcement structure; the modular beam reinforcement structure is a monolithic C-shaped channel structure; large gears are arranged oppositely on an inner side surface of the modular beam reinforcement structure; pinion gears and bolts are arranged at upper and lower relative positions of the modular beam reinforcement structure, and form a gear transmission fit with the large gears; a push-pull sliding plate is slidably connected via a sliding groove, and a gear sliding plate forms a gear transmission fit with the large gear. The connection device of the modular beam structure forms a tight mechanical interlock, which replaces the conventional single-point stress mode of bolts and welding, and can effectively resist the combined effect of bending moment, shear force and axial force.

Abstract: Training an encoder is provided. The method comprises inputting a current state of a number of aircraft into a recurrent layer of a neural network, wherein the current state comprises a reduced state in which a value of a specified parameter is missing. An action applied to the aircraft is input into the recurrent layer concurrently with the current state. The recurrent layer learns a value for the parameter missing from current state, and the output of the recurrent layer is input into a number of fully connected hidden layers. The hidden layers, according to the current state, learned value, and current action, determine a residual output that comprises an incremental difference in the state of the aircraft resulting from the current action.

Abstract: A shale gas formation oxidation induced rock burst stimulation method, the method including: performing hydraulic fracturing stimulation on a shale gas well to be fractured; and in the hydraulic fracturing process, injecting slick water A (f), oxidation fluid (e), slick water containing glue liquid (d), catalytic decomposition fluid (c), and slick water B (b) in a slug mode in sequence, and integrating shale physical characteristics and chemical thermodynamic properties to provide a fracturing fluid usage and the radius of the oxidation induced rock burst calculation formula. According to the method, the methane gas released by the shale gas formation after fracturing by the slick water A (f) is mixed with oxygen generated by the decomposition of hydrogen peroxide in the oxidation solution (e), and the shale gas formation is burst, such that the safe, efficient and damage-free multi-scale yield increasing stimulation of hydraulic fractures.

Abstract: In some implementations, a device may receive a set of update expressions associated with updating one or more items in the distributed database. The device may store the set of update expressions in an input queue. The device may aggregate, based on a value of a parameter satisfying a threshold, the set of update expressions to obtain aggerated update values for respective items of the one or more items, wherein the aggregated update values are summed values indicated by update expressions, of the set of update expressions, for the respective items of the one or more items. The device may generate, for each item, an aggregated update expression that indicates an aggregated update value, of the aggerated update values, for that item. The device may update the one or more items in the distributed database using the aggregated update expression for each item.

Abstract: The present disclosure provides a system and method for scanning a subject. The method includes determining reference dimensions, along the width direction of the table, of the subject on the table at positions along the moving direction of the table; dividing, based on the reference dimensions, the subject into at least one region along the moving direction of the table, the at least one region including at least one of a first region or a second region; and controlling a relative motion between the detector and the table to perform scanning on the at least one region in sequence along the moving direction of the table. During scanning one of the at least one region, the detector moves along the width direction of the table relative to the table.

Abstract: A high-density optical connector for demountable coupling to an external component having a fiber block that includes a body supporting a 2-D array of optical fibers, a 2-D array of microlenses aligned with the optical fibers for beam shaping, a coupling surface having passive alignment demountable coupling features matching complementary coupling features on a receptacle associated with the external connection point to be coupled, wherein the coupling surface comprises an optical region aligned with the microlens array and the optical fiber array permitting passage of light to and from optical fibers, with the demountable coupling features distributed adjacent the optical region in reference to the microlens array and optical fiber, and wherein the demountable coupling features are symmetrically arranged about at least one of two orthogonal axes of optical region.

Abstract: In a method, a main control virtual character is displayed in a world scene. A first battle character is subordinate to the main control virtual character. In the method, based on a scene switching condition being satisfied, one or more battle characters are displayed in a turn-based battle scene. The one or more battle characters include the first battle character or a second battle character in a region. A battle attribute of one of the one or more battle characters in the turn-based battle scene is determined based on (i) a behavior mode of the one or more battle characters or (ii) an influencing factor in the world scene. The one of the one or more battle characters is controlled to engage in the turn-based battle scene based on the battle attribute of the one of the one or more battle characters.

Abstract: The present invention discloses a vehicle fuzzy feedforward path tracking control method based on hydraulic steering leakage compensation. The method comprises: acquiring the steering wheel angle, wheel angle, and piston rod displacement; outputting desired wheel and steering wheel angles in different cycles using a path tracking algorithm; obtaining a feedforward leakage compensation parameter via fuzzy control; constructing a fuzzy control system; defuzzifying it using the centroid method to yield a fuzzy sliding mode controller; comparing the actual rear wheel angle; and controlling a compensation solenoid valve to replenish fluid each cycle. These steps are repeated for subsequent cycles until the path tracking process is complete. The method precisely determines the feedforward compensation parameter, thus accurately controlling the solenoid valve's duty cycle to timely compensate for leakage and enhance the path tracking accuracy of intelligent vehicles.