Abstract: Disclosed are a positive electrode material, a preparation method therefor, and an application thereof. The method includes: (1) performing a co-precipitation reaction by mixing a soluble manganese salt and a soluble metal M salt with carbonate, to obtain a co-precipitate containing MxMn1-xCO3; and (2) sintering the co-precipitate containing MxMn1-xCO3 in an air atmosphere to obtain the positive electrode material containing MxMn1-xP2, where M is at least one selected from Al, Zr, Ti, Ni, Co, Mg, Ta, Ca, Fe, Na, K, Cu, Zn, Nb, Sn, Sb, La and In, and where x is in a range from 0 to 1 excluding endpoints 0 and 1.

Abstract: A bonding structure and a power device. The bonding structure includes a first power unit and at least two bonding wires. At least one end of the bonding wire is connected to the first power unit through bonding. Projections that are of lead paths of the at least two bonding wires and that are on a preset plane have at least one intersection point. Spatial cross wire bonding is performed on the bonding wires, so that lead paths of the bonding wires form an angle with each other, thereby weakening electromagnetic force between the bonding wires. Therefore, fatigue due to fluctuating stress of the bonding wires can be alleviated, service lives of the bonding wires can be prolonged, and bonding effect can be ensured to a maximum extent.

Abstract: An open-ear earphone includes a housing, a chamber is provided inside the housing, a speaker is provided inside the chamber and divides the chamber into a front chamber and a rear chamber. The housing is provided with a first sound hole and a second sound hole. The front chamber is communicated to the outside through the first sound hole, and the rear chamber is communicated to the outside through the second sound hole. The rear chamber includes a first volume down chamber and a second volume down chamber communicated to the first volume down chamber, and the first volume down chamber is located between the speaker and the second volume down chamber. The sound wave in backward motion generated by the speaker is transmitted to the outside from the second sound hole after being reduced by the first volume down chamber and the second volume down chamber.

Abstract: A rotary earhanger structure of a wireless earphone includes an earhanger unit and a movable connection sleeve rotationally connected therewith. One end of the earhanger unit includes a first inclined surface portion extending obliquely in a preset rotational direction. The movable connection sleeve has a second inclined surface portion cooperatively connected with the first inclined surface portion. The movable connection sleeve is connected with an elastic member for driving the movable connection sleeve in a direction close to the earhanger unit. The external force rotates the earhanger unit in the preset rotating direction to adjust the wearing angle. When the earhanger unit is not subjected to the external force, the movable connection sleeve moves in the direction close to the earhanger unit under the force of the elastic member, so that the automatic reset function after the earhanger rotation is realized, thereby simplifying user operation and improving user experience.

Abstract: An open-ear Bluetooth® earphone includes an earphone body and a support frame. The support frame is configured to be plugged into a cavum concha of a wearer. The earphone body is provided with an audio source, and the support frame is installed on the earphone body and corresponds to the audio source. When in use, the support frame is configured to be firmly plugged into the cavum concha of the wearer to allow the earphone body to be worn on the ear of the wearer. The audio source corresponds to the ear canal of the wearer through the support frame, so that the sound emitted from the audio source is transmitted into the ear canal through the support frame. The audio source is directly opposite of the ear canal through the support frame to shorten the distance between the audio source and the ear canal.

Abstract: The present disclosure relates to a cover plate assembly for a lithium ion battery and a lithium ion battery. The cover plate assembly includes a cover plate body, provided at a middle portion thereof with a through hole which extends to form a tube body, and the tube body protrudes from at least one surface of the cover plate body; a pressure relief portion, wherein the pressure relief portion is located in the tube body and is in sealed communication with the tube body, the pressure relief portion is ring-shaped and is configured to crack and split from the cover plate body in response to deformation of the cover plate body; and a central conductor, embraced by the pressure relief portion and runs through the pressure relief portion along the axial direction. The cover plate assembly features excellent safety performance and small space occupation.

Abstract: A multi-drivers-in-the-loop driving testing platform is provided including at least a sensing simulation system, a vehicle dynamic simulation system, a driving simulator and a scene simulation system. The sensing simulation system is configured to generate object-level perception information, and send it to a vehicle control system; the driving simulator is configured to provide a driving environment and a driving scene for a human driver, output a driving instruction according to a driving intention of the human driver, and then send the driving instruction to the vehicle control system; the vehicle dynamic simulation system is configured to calculate state information according to control signals output by the vehicle control system; and the scene simulation system is configured to update the driving scene displayed in the driving simulator timely according to the vehicle state information. The disclosure saves costs of research and development and shortens cycles of research and development.

Abstract: A packaged device includes a circuit board, an electronic component, and a heat storage portion. The electronic component is electrically coupled to the circuit board; and the heat storage portion is disposed on the circuit board or embedded in the circuit board, and the heat storage portion is adjacent to the electronic component, where a specific heat capacity of the heat storage portion is higher than a specific heat capacity of the circuit board, and the heat storage portion is configured to store and release heat. A heat storage material with a relatively high specific heat capacity is introduced into the packaged device, and the heat storage portion is disposed on the circuit board around the electronic component where a large amount of heat generated by the electronic component in a short time can be quickly stored in the heat storage portion and then released to the outside.

Abstract: Provided are a laser cutting device and a laser cutting method. The laser cutting device comprises a beam expanding element provided with a plurality of lens sets, wherein optical axes of the plurality of lens sets are located in the same line and each lens set comprises at least one lens; the beam expanding element is configured to convert an incident beam into a first beam; and a spectroscopic element arranged on a light path of an emitted light of the beam expanding element, and wherein the spectroscopic element is configured to convert the first beam into multiple second beams that are annular and spaced apart from each other.

Abstract: The present disclosure provides a momentum-matching and band-alignment van der Waals (vdW) infrared photodetector and a fabrication method thereof. The photodetector includes a substrate, a dielectric layer, a Bi2O2Se layer, a black phosphorus (BP) layer, a metal source and a metal drain. The fabrication method includes: transferring, in a wet manner, the Bi2O2Se layer grown on the mica substrate onto the substrate having the dielectric layer, transferring the mechanically exfoliated BP layer through a micro-region fixed-point transfer device onto the Bi2O2Se layer, and separately fabricating the metal source and the metal drain on the Bi2O2Se layer and the BP layer by processes such as electron beam exposure and electron beam evaporation, thereby forming the momentum-matching and band-alignment vdW infrared photodetector having a vertical structure.

Abstract: The present invention relates to a method for producing a composite membrane, the method comprising impregnating a surface of a porous membrane substrate with an aqueous suspension comprising a mixture of at least one polyamine and at least one hospholipid; and contacting the impregnated surface with an organic phase containing a monomer to thereby deposit a polyamide layer on the impregnated surface. The present invention also relates to a composite membrane comprising at least one porous membrane substrate having nano-sized or micro-sized pores; and at least a polyamide layer disposed on a surface of the porous membrane substrate, the polyamide layer comprising at least one phospholipid dispersed therein, and wherein the polyamide layer is an interfacial polymerization product.

Abstract: A toy water ball includes a plurality of petals each having a first edge portion and a second edge portion. Each first edge portion is provided with first magnetic members, and each second edge portion is provided with second magnetic members. When all petals are closed to form a spherical shape, an attraction force is generated between the first magnetic members of each petal and the second magnetic members of the adjacent petal so that the first edge portion of the petal tightly fit the second edge portion of the adjacent petal and a water-carrying cavity is formed. The toy water ball can be closed or opened repeatedly and can be reused. Thus, it is environmentally friendly and clean. Furthermore, the toy water ball can be filled with water in a common water source without a specific pressure, so it can be used in many occasions, and has strong applicability.

Abstract: A construction device and method for a lateral bracing in an ultra-deep foundation pit with silt includes a first-layer lateral bracing member, a plurality of suspension rope systems and construction operation plates. The first-layer lateral bracing member is connected with the enclosing structure of the foundation pit. The suspension rope systems include saddles, slings and joists. The saddles are connected with the first-layer lateral bracing member, and the construction operation plates are connected with the joists.

Abstract: A construction device and method for a lateral bracing in an ultra-deep foundation pit with silt includes a first-layer lateral bracing member, a plurality of suspension rope systems and construction operation plates. The first-layer lateral bracing member is connected with the enclosing structure of the foundation pit. The suspension rope systems include saddles, slings and joists. The saddles are connected with the first-layer lateral bracing member, and the construction operation plates are connected with the joists.

Abstract: A method and apparatus for controlling distribution of power is provided. The apparatus comprises a plurality of power outlets including a master power outlet (12M) and at least one controlled power outlet (12S), a control circuit configured to sense a characteristic of power delivered to the master power outlet (12M), a relay circuit coupled to the control circuit and a power supply configured to provide power to the control circuit and to the relay circuit. The power supply adjusts a voltage level on the base of the power delivered to the master power outlet. The apparatus can reduce energy consumption.

Abstract: A power amplifier comprises a first inductor, a second inductor, a capacitor, a first MOS transistor, a second MOS transistor and a current source. The first and the second inductors are both connected to a first power supply. The first inductor and the second inductor form a differential inductor. The capacitor is connected to the first inductor at a first terminal of and to the second inductor at a second terminal. A drain of the first MOS transistor is connected to the first terminal of the capacitor. A drain of the second MOS transistor is connected to the second terminal of the capacitor. A first terminal of the current source is connected to sources of both the first and the second MOS transistors. A second terminal of the current source is connected to a second power supply. The current source outputs a variable current based on a bias voltage input.

Abstract: A method and apparatus for controlling distribution of power is provided. The apparatus comprises a plurality of power outlets including a master power outlet (12M) and at least one controlled power outlet (12S), a control circuit configured to sense a characteristic of power delivered to the master power outlet (12M), a relay circuit coupled to the control circuit and a power supply configured to provide power to the control circuit and to the relay circuit. The power supply adjusts a voltage level on the base of the power delivered to the master power outlet. The apparatus can reduce energy consumption.

Abstract: A circuit comprises a transmitter port; a receiver port; an antenna port configured to transmit a signal from the transmitter port to antenna port and receive a signal at antenna port and pass to the receiver port; and a switch configured to switch whether the transmitter port or the receiver port is communicatively coupled to the antenna port. The switch comprises a plurality of NMOS FETs configured to switch between the transmitter port and the receiver port.