Abstract: A metal 3D printing device comprises a building platform, a first powder spreading arm, a second powder spreading arm, a gas stream unit and a scanning module. The building platform is for supporting the powder. The first and second powder spreading arms are spaced and configured for spreading powder. The gas stream unites comprises a gas blowing port and a gas suction port, the gas blowing port is provided in the first powder spreading arm, and the gas suction port is provided in the second powder spreading arm. The scanning module is for emitting a laser to the powder preplaced between the first and second powder spreading arms to solidify the powder to form the product.

Abstract: An inertia braking test system and a control method is provided, wherein the inertia braking test system is composed of an inertia brake test system, a sensor system and a tested object. An actuating device is connected with the inertia brake control device through a ball stud. The actuation function of the inertia brake control device with two degrees of freedom along the front-and-rear direction and the up-and-down direction of the vehicle is realized. The movable chassis realizes the mobile function of the system. The acceleration sensor can sense the acceleration of the movable chassis. Each force is tested by the first force sensor, the second force sensor and the third force sensor. The displacement data is measured by the first displacement sensor and the second displacement sensor, so that a movable brake system test is achieved.

Abstract: An inertia braking test system and a control method is provided, wherein the inertia braking test system is composed of an inertia brake test system, a sensor system and a tested object. An actuating device is connected with the inertia brake control device through a ball stud. The actuation function of the inertia brake control device with two degrees of freedom along the front-and-rear direction and the up-and-down direction of the vehicle is realized. The movable chassis realizes the mobile function of the system. The acceleration sensor can sense the acceleration of the movable chassis. Each force is tested by the first force sensor, the second force sensor and the third force sensor. The displacement data is measured by the first displacement sensor and the second displacement sensor, so that a movable brake system test is achieved.

Abstract: Disclosed are a continuous rolling device and method with interfacial temperature-force controllability for a seamless metal cladding pipe. The device comprises a multi-roller skew rolling mill set, an interfacial temperature-force controlled rolling mill set and a sizing and finishing mill set sequentially distributed along a rolling axis; and the interfacial temperature-force controlled rolling mill set comprises an interface temperature control module and an interface pressure control module sequentially distributed along the rolling axis, the interface pressure control module comprises two racks and a plurality of controlled rolling rollers circumferentially and evenly distributed along the rolling axis, two ends of the controlled rolling roller are respectively mounted on the two racks through corresponding screwdown apparatuses, and the interface pressure control module realizes passive driving through a spiral pushing force or a traction force.

Abstract: A vulcanizing agent is added during the processing of a polymer, and can form a crosslinking structure network in the polymer, thereby improving the mechanical properties of the material. Furthermore, the crosslinking agent can also de-crosslink the polymer material at a high temperature, and after being cooled, same can be crosslinked again to produce a network structure, thus endowing the polymer material with thermoplasticity for repeated processing.

Abstract: A propylene copolymer, a preparation method therefor, and an application thereof are provided. The copolymer forms a cross-linked network by means of a reaction between a furan-containing propylene copolymer and a small molecule of a coupling agent, thereby achieving a chemical bond connection between a polypropylene resin phase and an ethylene-propylene copolymer elastomer phase, fundamentally strengthening the force between the two phases, and improving the mechanical properties of a material. Meanwhile, the copolymer can achieve the decrosslinking of a material during melt processing such that the material has thermoplasticity, and after cooling, it can be crosslinked again to produce network structure.

Abstract: A laser printing device for making high-precision 3D products includes a platform, a device supplying and spreading powder for transporting and spreading metal powder on the top surface of the platform, a first laser source for emitting continuous laser beam, a second laser source for emitting pulsed laser beam, an optical path switching device connected with the first laser source and the second laser source for controlling and selecting the first laser source and the second laser source to emit laser beam, a scanning galvanometer system for focusing the laser beam on the platform for making the continuous laser beam melt the metal powder and a layer of a product being formed after cooling, a mechanical processing device for polishing the final surface of the product. The pulsed laser beam cuts the edge of each newly-deposited layer with geometric accuracy. A laser printing method for 3D product is also provided.

Abstract: Systems and methods of separating components of a multi-component gas mixture are described herein. The systems include one or more packed bed columns packed with a biosorbent material. Upon passing the multi-component gas mixture through the packed bed column, substantially all of a polar component of the multi-component gas mixture is adsorbed by the biosorbent material and a non-polar component of the multi-component gas mixture is not substantially adsorbed by the biosorbent material.

Abstract: Provided are an active antenna system, a mobile terminal, and a configuration method of an antenna system. The active antenna system includes an active amplification module and an external antenna. The active amplification module is detachably electrically coupled to an electronic device, wherein the active power amplification module includes an active antenna circuit for amplifying and filtering a signal transmitted and received by the external antenna, and the external antenna is detachably electrically coupled to the active power amplification module. The problem of increase of power consumption of the terminal caused by enlarging a signal radiation range of the terminal is solved, thereby realizing decrease of the power consumption of the terminal while enlarging the signal radiation range of the terminal.

Abstract: A BLDC includes an outer casing, and a first sub-motor and a second sub-motor mounted within the outer casing. The BLDC further includes a terminal hub, and a first conductive terminal set and a second conductive terminal set. The first and second sub-motor include their respective stators that are energized independently and a common rotor. The first conductive terminal set is configured as a power supply branch circuit for the stator of the first sub-motor, the second conductive terminal set is configured as a power supply branch circuit for the stator of the second sub-motor. The first and second sub-motors can be configured to selectively commonly operate as a single motor to output normal power or operate independently. When one sub-motor fails, the other sub-motor can independently operate to ensure reliability and safety of the motor.

Abstract: Provided are an active antenna system, a mobile terminal, and a configuration method of an antenna system. The active antenna system includes an active amplification module and an external antenna. The active amplification module is detachably electrically coupled to an electronic device, wherein the active power amplification module includes an active antenna circuit for amplifying and filtering a signal transmitted and received by the external antenna, and the external antenna is detachably electrically coupled to the active power amplification module. The problem of increase of power consumption of the terminal caused by enlarging a signal radiation range of the terminal is solved, thereby realizing decrease of the power consumption of the terminal while enlarging the signal radiation range of the terminal.

Abstract: A BLDC includes an outer casing, and a first sub-motor and a second sub-motor mounted within the outer casing. The BLDC further includes a terminal hub, and a first conductive terminal set and a second conductive terminal set. The first and second sub-motor include their respective stators that are energized independently and a common rotor. The first conductive terminal set is configured as a power supply branch circuit for the stator of the first sub-motor, the second conductive terminal set is configured as a power supply branch circuit for the stator of the second sub-motor. The first and second sub-motors can be configured to selectively commonly operate as a single motor to output normal power or operate independently. When one sub-motor fails, the other sub-motor can independently operate to ensure reliability and safety of the motor.

Abstract: An ornament piece includes a base, a middle layer formed on the base and a surface layer formed on the middle layer. The middle layer includes a priming layer and a metal layer, the priming layer includes a matted metal texture, the metal layer includes a bright metal texture, the middle layer defines at least one groove. The at least one groove extends to the metal layer, a portion of the priming layer aligned to the groove is visual from the surface layer. A manufacture method of the ornament piece is also provided.

Abstract: A process for preparing polypropylene compositions having high impact strength at low temperatures is disclosed in which the reaction is catalyzed by Ziegler-Natta/metallocene hybrid catalysts by the in-situ polymerization of one or more olefins of the formula CH2?CHR, in which R is hydrogen or an alkyl, cycloalkyl or aryl group having from 1 to 10 carbon atoms, and more specifically comprises preparing an olefin polymer by Ziegler-Natta catalyst components of the titanium or vanadium/metallocene hybrid catalysts while the metallocene components are inactivated beforehand by catalyst inactivators; and polymerizing one or more olefins in the presence of the above olefin polymer, followed by a reactivation of the metallocene components.

Abstract: A testing system (100) for testing quality of portable electronic devices includes a processor (10) and a plurality of testing apparatuses (20) connected to the processor. The processor includes a database module (13); the database module saves testing programs and testing parameters. The testing apparatuses are configured for receiving testing data from the portable electronic devices and sending the testing data to the processor. The processor processes the testing data to test quality of the portable electronic devices and check working status of each testing apparatus at the same time of testing quality of the portable electronic devices.