Abstract: A method and a system for controlling battery swapping of a vehicle and a vehicle are provided. The method includes: receiving, by a vehicle control unit (VCU), a battery swapping instruction, and transmitting the battery swapping instruction to a battery manager when the vehicle is in a high-voltage power-on state; transmitting, by the battery manager, an enable instruction to a direct current (DC) charger assembly in response to the received battery swapping instruction; and performing, by the DC charger assembly, a starting operation in response to the enable instruction, so as to provide a power supply voltage to a vehicle load after an electrical connection between a power battery pack and a high-voltage circuit of the vehicle is cut off during battery swapping of the vehicle.

Abstract: A multi-functional massager, including a foot massage mechanism and a leg massage mechanism; the foot massage mechanism has a foot massage assembly provided within a first housing to provide foot massage, and the leg massage mechanism has two adjacent slots formed within a second housing; massage airbags are provided in the slots; two sides of the second housing is rotatably connected to two side surfaces of the first housing. Accordingly, simultaneous foot and leg massage can be achieved, and the massager can be folded in a storage position to form a footstool.

Abstract: A method for controlling automatic battery swapping of a rail vehicle, includes: receiving vehicle information sent by the rail vehicle; determining whether the rail vehicle has a battery swapping need based on the vehicle information of the rail vehicle; in response to determining that the rail vehicle has the battery swapping need, determining a target battery swapping station according to the battery swapping need; and sending a battery swapping notification signal and a vehicle control signal to the rail vehicle, and sending a battery swapping request signal to the target battery swapping station, where the battery swapping notification signal includes position information of the target battery swapping station, the vehicle control signal controls the rail vehicle to travel to the target battery swapping station, and the battery swapping request signal includes identification information of the rail vehicle and requests the target battery swapping station to swap a battery pack for the rail vehicle.

Abstract: The present disclosure provides a method and a device for preparing a modified poly (m-phenylene isophthalamide) (PMIA) fiber by continuous polymerization-dry-wet spinning. The method includes the following steps: (1) preparing a mixed solution of m-phenylenediamine (MPD) and a copolymerized diamine monomer in N,N-dimethylacetamide (DMAC) serving as a solvent using a cosolvent; (2) mixing isophthaloyl chloride (IPC) with the mixed solution of the MPD and the copolymerized diamine monomer in the DMAC, and conducting pre-polycondensation and polycondensation in sequence to obtain a modified PMIA resin solution; and (3) subjecting the modified PMIA resin solution to additive addition, filtration, defoaming, and dry-wet spinning to obtain the modified PMIA fiber.

Abstract: A radio frequency laser includes: a power box, a radio frequency cavity, an electrode, and a first metal blocking ring. A bottom plate of the power box is provided with a first installation hole and a first installation groove, and the first installation groove is arranged around the first installation hole. A top plate of the radio frequency cavity is provided with a second installation hole and a second installation groove, and the second installation groove is arranged around the second installation hole. When the power box is assembled with the radio frequency cavity, the second installation hole corresponds to the first installation hole, and the second installation groove corresponds to the first installation groove.

Abstract: A modular wind turbine blade includes a blade root, an intermediate portion and a blade tip. The intermediate portion includes a plurality of modular blades, two adjacent modular blades being provided at edge thereof with a first connecting portion and a second connecting portion that cooperate with each other, and wherein the plurality of modular blades includes a trailing edge shell, a leading edge shell and a main beam, respectively, the first connecting portion at the edge of the trailing edge shell and the leading edge shell being fixedly connected to the second connecting portion at the edge of the main beam. The wind turbine blade according to the present invention adopts segmented modular structural design, which effectively reduces the mold occupancy time of the blade, shortening the production cycle and improving the molding efficiency.

Abstract: A massage head assembly, including a massage head base disc (1), a massage head support (2), and silicone massage heads (3). The silicone massage heads (3) are fixed on the massage head support (2), the massage head support (2) is detachably fixed on the massage head base disc (1), the silicone massage heads (3) are hollow, and a buffer space (31) is formed between inner walls of the silicone massage heads (3) and the massage head support (2). The overall structure of the massage head assembly is simple, and when used for massaging the human body, the massage head assembly provides a comfortable massage.

Abstract: A fluidic system for fraction collection comprises a switching valve having a plurality of ports for connecting first and second ports in different configurations. An inlet line is directly connected to the first port, and a collection device is directly connected to the second port. In a collection configuration, the first port and the second port are connected. The ports further comprise third and fourth ports, and the fluidic system further comprises a buffer section directly connected to the third and fourth ports. The fluidic system further comprises a first collection reservoir and is configured to position the collection device to expel a fluid into the first collection reservoir. In a buffer configuration, fluid flows through the inlet line, the first port, the third port, the buffer section, the fourth port, the second port, and the collection device.

Abstract: The present invention discloses a construction method for a spatial aggregate reinforced 3D printed concrete structure, including: selecting a structural member, performing mechanical analysis, and determining a basic dosage and a printing and weaving process of an implanted reinforcement or braided rope/wire material, determining a type, positioning and dosage of a spatial aggregate, preparing 3D printing materials, editing an electromagnetic signal and positioning push program of the spatial rigid aggregate according to the selected positioning and dosage of the spatial rigid aggregate, the 3D printing material is extruded along the printing and weaving process and while the reinforcement is implanted or the rope/wire is woven into the space, the spatial rigid aggregate is evenly scattered, and realizing the connection between spatial aggregates and the connection between the spatial aggregates and the reinforcements or ropes/wires respectively, a spatial aggregate reinforced 3D printed concrete structure i

Abstract: A foamable polypropylene composition, and foamed polypropylene and a preparation method therefor are provided. The polypropylene composition comprises polypropylene, a polypropylene modifier, a foaming agent, and an optional nucleating agent. A preparation method for the polypropylene modifier comprises: enabling polar monomer grafted polypropylene to be in contact with a component A to react and carrying out extruding pelletizing, wherein a polar monomer in the polar monomer grafted polypropylene can chemically react with the component A; the polar monomer is selected from at least one of dimethylamino methacrylate, epoxy acrylate, trimeric acrylic isocyanurate, and acrylamide; and the component A is selected from at least one of polyisocyanate, polyethylene oxide, and an amido-containing substance. The foamed polypropylene has an obtained foaming ratio of 12 times or more, and also has high tensile and flexural properties.

Abstract: Provided is a rhomboid structured triboelectric nanogenerator based on a built-in U-shaped support. The device includes a diamond-shaped bracket and two U-shaped supports. The U-shaped supports is connected with the diamond-shaped bracket through four connecting rods, and the supporting plates of U-shaped supports are sequentially adhered with metal conductor layer and a dielectric material layer, which forms the power generation unit. When the diamond-shaped bracket is closed, the dielectric material layers on the two supporting plates come into contact to produce friction charge; and then subjected to the reverse force after compression of the spring, the two dielectric material layers are separated, so as to generate an induction electric field by the friction charge and form a potential difference. Compared with an existing vibration energy harvester, the advantages will be small space occupation, a long service life, simple fabrication, and a high energy conversion rate.

Abstract: An information transmission method is provided, including: A control device obtains a second universal serial bus video class UVC port and a second virtual network port based on configuration of a universal serial bus USB port of the control device. The control device determines address information of a camera device, where a first UVC port and a first virtual network port are configured on the camera device, and the first UVC port and the first virtual network port are obtained based on configuration of a USB port of the camera device. The control device sends the address information to the camera device through a UVC channel, where the UVC channel is established based on the first UVC port and the second UVC port.

Abstract: The present disclosure provides an electrostatic self-powered displacement grid sensor used for measuring the displacement of a component to be measured. The device structure includes a sliding chute and a sliding sheet, wherein the sliding chute is fixed to a fixed end, and the bottom of the inner side of the sliding chute is provided with a sensing array; the sliding sheet is fixedly connected with the component to be measured, and the lower end of the sliding plate is in contact with the bottom of the inner side of the sliding chute. When the sliding sheet slides over the sensing array; a corresponding electrical signal is produced, and the number of segments and the distance on sensing units on a single sensing array over which the sliding sheet slides can be obtained according to numbers and output current of sensing units in the sensing array indicated by the signal, and therefore the structural displacement is obtained.

Abstract: Disclosed in the present invention is a novel overvoltage protective device for lightning protection, comprising a first varistor, a second varistor, a PTC Thermistor, and lead-out terminals. The first varistor and the PTC Thermistor are connected in parallel, and then further connected in series with the second varistor to form a single port combined circuit. The surge-withstand capability of the first varistor is higher than the surge-withstand capability of the second varistor. At least one of the two lead-out terminals of the single port combined circuit is a thermally-conductive end with low thermal resistance. The second varistor is thermally coupled to the PTC Thermistor. The thermally-conductive end with low thermal resistance is thermally coupled to one or both of the second varistor and the PTC Thermistor.

Abstract: A packer module with selective control and fluid bypass can be interactive with other packer modules in a system for isolating and evaluating. The packer module includes a motor section, a conversion section, a control section, a sealing member, and an isolated flow path section. The control section includes a ramp sleeve cooperative with the sealing member to set a retracted configuration, an initial sealed configuration, and an isolated sealed configuration of the sealing member. The isolated flow path section includes an isolated flow path channel. The isolated flow path channel can only be opened with the sealing member in the isolated sealed configuration so that a zone formed by the packer module can be isolated and evaluated. Measuring and detecting instruments along the different flow paths through packer module evaluate the fluid properties of the bypass fluids and isolated fluids through the different flow paths.

Abstract: The present invention discloses a construction method of 3D printing and weaving integrated building, comprising: selecting basic building structural components, using finite element analysis after spatial modeling, and combining stress nephogram to set a discrimination domain value and optimize a structure space, obtaining a structural component skeleton; calculating and analyzing the structural component skeleton, determining a weaving range and weaving density of a wire according to weak areas and sizes under structural stress; and then determining a printing process and weaving process according to the structural component skeleton, the weaving range and the weaving density; preparing 3D printing material; 3D printing a matrix and weaving the wire according to the printing process and weaving process, constructing layer by layer, or printing segments, and then connecting segments by preset tenoning structural sections to form a 3D printing and weaving integrated building.

Abstract: The present disclosure provides an electrostatic self-powered strain grid sensor configured to measure strain of a component to be measured. The sensor includes a slide groove and a slide sheet. The slide groove is fixed to a fixing end and a sensor array is arranged at an inside bottom of the slide groove. The slide sheet is fixedly connected with the component to be measured and a lower end part of the slide sheet is in contact with the inside bottom of the slide groove. An electric signal is output when the slide sheet sweeps over the sensor array. Based on the output current of a sensor unit of the sensor array indicated by the signal, the number of segments swept over by the slide sheet and a distance swept over the sensor units in a single sensor array by the slide sheet is obtained, thereby acquiring a structural strain.

Abstract: The present disclosure provides an electrostatic self-powered displacement grid sensor used for measuring the displacement of a component to be measured. The device structure includes a sliding chute and a sliding sheet, wherein the sliding chute is fixed to a fixed end, and the bottom of the inner side of the sliding chute is provided with a sensing array; the sliding sheet is fixedly connected with the component to be measured, and the lower end of the sliding plate is in contact with the bottom of the inner side of the sliding chute. When the sliding sheet slides over the sensing array; a corresponding electrical signal is produced, and the number of segments and the distance on sensing units on a single sensing array over which the sliding sheet slides can be obtained according to numbers and output current of sensing units in the sensing array indicated by the signal, and therefore the structural displacement is obtained.

Abstract: The present disclosure provides an electrostatic self-powered strain grid sensor configured to measure strain of a component to be measured. The electrostatic self-powered strain grid sensor includes a slide groove and a slide sheet. The slide groove is fixed to a fixing end and a sensor array is arranged at an inside bottom of the slide groove. The slide sheet is fixedly connected with the component to be measured and a lower end part of the slide sheet is in contact with the inside bottom of the slide groove. A corresponding electric signal is output when the slide sheet sweeps over the sensor array. Based on the number and magnitude of the output current of a sensor unit of the sensor array indicated by the signal, the number of segments swept over by the slide sheet and a distance swept over the sensor units in a single sensor array by the slide sheet is obtained, thereby acquiring a structural strain.