Abstract: A power module includes a power source module and a metallic heat-dissipation substrate. The power source module has an input pin and an output pin soldered on and electrically connected with a system board and includes a printed circuit board. The printed circuit board has a first surface and a second surface. At least a heat-generating component is disposed on the second surface. The metallic heat-dissipation substrate has a first surface and a second surface opposite to each other. The first surface has at least a fixing position and at least a heat-dissipating position. The fixing position is directly or indirectly connected with the second surface. A gap accumulated by tolerances is existed between the heat-dissipating position and the heat-generating component. A gap-filling material is filled into the gap. The second surface and the system board are soldered with each other. Therefore, the heat-dissipation efficiency is enhanced.

Abstract: Provided by the present invention is a cathode material for a sodium-ion battery with a coating structure and a preparation method therefor. In the present invention, an Na3V2(PO4)3/C cathode material is prepared by means of a sol-gel method. Synthesized zwitterionic polymers may be used as chelating agents and as a carbon source; the process is simple, can quickly form a gel, and the reaction time is shortened contains a zwitterionic structure which may be well dissolved with the precursor of sodium vanadium phosphate to form a stable carbon coating layer. Compared to the prior art, the cathode material for a sodium-ion battery of the present invention enhances the electrical conductivity and cycle performance of the cathode material by means of the doping of nitrogen and sulfur on carbon. At the same time, the prepared cathode material for a sodium-ion battery has sodium vacancies and maintains a stable structure during the process of sodium-ion intercalation/deintercalation.

Abstract: A power module includes a power source module and a metallic bottom heat-dissipation substrate. The power source module has an input pin and an output pin soldered on and electrically connected with a system board and includes a printed circuit board. The printed circuit board has a top surface and a bottom surface. At least a heat-generating component is disposed on the bottom surface. The metallic bottom heat-dissipation substrate has an upper surface and a lower surface opposite to each other. The upper surface has at least a fixing position and at least a heat-dissipating position. The fixing position is directly or indirectly connected with the bottom surface. A gap accumulated by tolerances is existed between the heat-dissipating position and the heat-generating component. A gap-filling material is filled into the gap. The lower surface and the system board are soldered with each other. Therefore, the heat-dissipation efficiency is enhanced.

Abstract: A voltage regulator module includes a circuit board assembly and a magnetic core assembly. The circuit board assembly includes a printed circuit board and at least one switch element. A first concave structure is concavely formed on a second surface of the printed circuit board. At least one protrusion post is disposed within the first concave structure. A pin as a positive output terminal, a pin as a positive input terminal and a pin as a negative output terminal are disposed on the second surface of the printed circuit board. The switch element is disposed on a first surface of the printed circuit board. The magnetic core assembly is accommodated within the first concave structure, and includes at least one opening. The protrusion post is penetrated through the corresponding opening. Consequently, at least one inductor is defined by the at least one protrusion post and the magnetic core assembly collaboratively.

Abstract: The present disclosure provides a preparation method of a shape memory polyurethane, which comprising: reacting 1,3,5,7-tetrahydroxyadamantane, ?-caprolactone, a catalyst and a solvent for 20-50 hours under the conditions of inert gas and 70° C. to 130° C. to obtain adamantyl star poly(?-caprolactone), wherein the mole ratio of the 1,3,5,7-tetrahydroxyadamantane to the ?-caprolactone is 1:(40-240); mixing the adamantyl star poly(?-caprolactone) with long-chain diol and diisocyanate, adding the catalyst and the solvent, and reacting for 3-9 hours at 50-100° C. to obtain an isocyanate-terminated polyurethane prepolymer, wherein the mass ratio of the adamantyl star poly(?-caprolactone) to the long-chain diol is 9:1-1:9; and adding a linking agent in the polyurethane prepolymer so that the linking agent reacts with isocyanate in the polyurethane prepolymer to obtain an adamantyl cross-linked shape memory polyurethane.

Abstract: The present disclosure provides a method for preparing hollow glass microbeads coated with graphene oxide, which includes: dispersing graphene oxide into deionized water, to form an aqueous graphene oxide solution; placing hollow glass microbeads into the aqueous graphene oxide solution, to achieve a dispersion liquid; and simultaneously performing an ultrasonic vibration treatment and a drying treatment to the dispersion liquid, to achieve the hollow glass microbeads coated with the graphene oxide. Through simultaneously performing the ultrasonic vibration treatment and the drying treatment to the dispersion liquid, the graphene oxide is uniformly coated on the surface of the hollow glass microbeads, and thus the surface properties of the hollow glass microbeads are maintained, because no other additives such as adhesives are required.

Abstract: Provided are a polymer having ultraviolet absorption functionality and preparation method thereof; specifically, three monomers having different ultraviolet absorption bands are used for copolymerization, achieving a significant expansion of the ultraviolet absorption range and achieving the effect of full-band ultraviolet shielding. The obtained polymer film has strong visible light transmittance, fluorescence, easy processing, excellent stability, and remarkable ultraviolet shielding performance, and can be broadly applied in such areas as aviation, construction, agriculture, and optical devices.

Abstract: Provided by the present invention is a cathode material for a sodium-ion battery with a coating structure and a preparation method therefor. In the present invention, an Na3V2(PO4)3/C cathode material is prepared by means of a sol-gel method. Synthesized zwitterionic polymers may be used as chelating agents and as a carbon source; the process is simple, can quickly form a gel, and the reaction time is shortened contains a zwitterionic structure which may be well dissolved with the precursor of sodium vanadium phosphate to form a stable carbon coating layer. Compared to the prior art, the cathode material for a sodium-ion battery of the present invention enhances the electrical conductivity and cycle performance of the cathode material by means of the doping of nitrogen and sulfur on carbon. At the same time, the prepared cathode material for a sodium-ion battery has sodium vacancies and maintains a stable structure during the process of sodium-ion intercalation/deintercalation.

Abstract: A story album display method and apparatus, and relate to the field of communications technologies, so that a thematic story album can be generated. The method includes: aggregating, by a terminal, N images in a gallery based on a first dimension, where the first dimension includes a photographing time and/or a photographing location, and N>1; and removing, by the terminal, an invalid image from the N images, to obtain the story album comprising the M images, wherein the invalid image comprises an image with an invalid label, or one or more images with an image similarity greater than a threshold; and displaying, by the terminal, an album cover of a story album, where the story album includes M images in the N images, the M images are associated with a theme of the story album, and M<N.

Abstract: A voltage regulator module includes a circuit board assembly, a magnetic core assembly and a molding compound layer. The circuit board assembly includes a printed circuit board and at least one switch element. The switch element is disposed on a first surface of the printed circuit board. Moreover, at least one first copper post, at least one second copper post, at least one third copper post and the magnetic core assembly are disposed on a second surface of the printed circuit board. The magnetic core assembly includes at least one opening. The at least one first copper post is penetrated through the corresponding opening, so that at least one inductor is defined by the at least one first copper post and the magnetic core assembly collaboratively. The molding compound layer encapsulates the printed circuit board and the magnetic core assembly in a double-sided molding manner.

Abstract: A voltage regulator module includes a circuit board assembly and a magnetic core assembly. The circuit board assembly includes a printed circuit board and at least one switch element. A first concave structure is concavely formed on a second surface of the printed circuit board. At least one protrusion post is disposed within the first concave structure. A pin as a positive output terminal, a pin as a positive input terminal and a pin as a negative output terminal are disposed on the second surface of the printed circuit board. The switch element is disposed on a first surface of the printed circuit board. The magnetic core assembly is accommodated within the first concave structure, and includes at least one opening. The protrusion post is penetrated through the corresponding opening. Consequently, at least one inductor is defined by the at least one protrusion post and the magnetic core assembly collaboratively.

Abstract: A file processing method includes obtaining, by a mobile terminal, a first operation from a user, displaying a first file on a first screen of a first application, obtaining, by the mobile terminal, a second operation from the user on the first screen, displaying, in response to the second operation, the first file on a recycle bin screen of the first application, deleting, by the mobile terminal, a first data table, where the first file is invisible to the user on the recycle bin screen of the first application due to deletion of the first data table, obtaining, by the mobile terminal, a third operation from the user, and generating, in response to the third operation, a second data table, where the first file is visible due to existence of the second data table.

Abstract: A power module includes a power source module and a metallic bottom heat-dissipation substrate. The power source module has an input pin and an output pin soldered on and electrically connected with a system board and includes a printed circuit board. The printed circuit board has a top surface and a bottom surface. At least a heat-generating component is disposed on the bottom surface. The metallic bottom heat-dissipation substrate has an upper surface and a lower surface opposite to each other. The upper surface has at least a fixing position and at least a heat-dissipating position. The fixing position is directly or indirectly connected with the bottom surface. A gap accumulated by tolerances is existed between the heat-dissipating position and the heat-generating component. A gap-filling material is filled into the gap. The lower surface and the system board are soldered with each other. Therefore, the heat-dissipation efficiency is enhanced.

Abstract: A method can measure the size of an object using a terminal having two cameras. The method includes obtaining, by a terminal using a first camera, a first image that includes a to-be-measured object, and obtaining, using a second camera, a second image that includes the to-be-measured object, where the first camera and the second camera are disposed in a same plane. The method also includes comparing locations of the to-be-measured object in the first image and in the second image, so as to obtain a total location offset of the to-be-measured object. Additionally, the method includes receiving a measurement point selection instruction entered by a user based on the first image, and calculating a distance between selected measurement points according to the total location offset, a distance between a center of the first camera and a center of the second camera, and a focal length of the first camera.

Abstract: The present invention is applicable to the field of polymer material preparation, and provides a method for preparing polymer hollow microspheres, the steps are as follows: mixing a styrene-based monomer A, an acrylic monomer B, and an acrylate monomer C with a initiator, and reacting to prepare a seed emulsion; maintaining the temperature of the seed emulsion unchanged, mixing the styrene-based monomer A, the monomer C, and a sulfur-containing acrylic monomer D with the initiator, continuously dripping to the seed emulsion, to obtain a product; adding alkaline solution to the product, then adding acid solution, and finally neutralizing, to obtain hollow microspheres.

Abstract: The present disclosure provides a preparation method of a shape memory polyurethane, which comprising: reacting 1,3,5,7-tetrahydroxyadamantane, ?-caprolactone, a catalyst and a solvent for 20-50 hours under the conditions of inert gas and 70° C. to 130° C. to obtain adamantyl star poly(?-caprolactone), wherein the mole ratio of the 1,3,5,7-tetrahydroxyadamantane to the ?-caprolactone is 1:(40-240); mixing the adamantyl star poly(?-caprolactone) with long-chain diol and diisocyanate, adding the catalyst and the solvent, and reacting for 3-9 hours at 50-100° C. to obtain an isocyanate-terminated polyurethane prepolymer, wherein the mass ratio of the adamantyl star poly(?-caprolactone) to the long-chain diol is 9:1-1:9; and adding a linking agent in the polyurethane prepolymer so that the linking agent reacts with isocyanate in the polyurethane prepolymer to obtain an adamantyl cross-linked shape memory polyurethane.

Abstract: The present invention relates to the field of shape memory materials. Specifically, a shape memory polymer, a preparation method therefor, and use thereof are provided. The shape memory polymer is formed by polymerizing methyl ally polyethenoxy ether and 2-(dimethylamino)ethyl methacrylate. The synthesis steps of the shape memory polymer are simplified, the preparation method is simple, and the production cost is low. In addition, the shape memory polymer prepared in the present invention has excellent shape memory performance and high hydrophilicity and biocompatibility, and is suitable for preparing biomedical materials in the field of biomedical science.

Abstract: A method for preparing an amphoteric shape-memory polyurethane and an amphoteric shape-memory polyurethane prepared by the method, the method including: 1) polymerizing monomer A and monomer B to synthesize a polyurethane; and 2) contacting monomer D and the polyurethane to conduct a ring-opening reaction on a nitrogen group of the polyurethane, to yield an amphoteric shape-memory polyurethane. The monomer A is a N-alkyl dialkanolamine having a formula I. The monomer B is a polyisocyanate, and the monomer D is an alkyl sulfonate.

Abstract: The present invention is applicable to the field of polymer material preparation, and provides a method for preparing polymer hollow microspheres, the steps are as follows: mixing a styrene-based monomer A, an acrylic monomer B, and an acrylate monomer C with a initiator, and reacting to prepare a seed emulsion; maintaining the temperature of the seed emulsion unchanged, mixing the styrene-based monomer A, the monomer C, and a sulfur-containing acrylic monomer D with the initiator, continuously dripping to the seed emulsion, to obtain a product; adding alkaline solution to the product, then adding acid solution, and finally neutralizing, to obtain hollow microspheres.

Abstract: The present disclosure relates to the field of shape memory materials, it discloses a betaine-based shape memory polymer and the preparation method thereof. The polymer is formed through free radical polymerization of an unsaturated betaine monomer, an acrylic monomer, and an ethylene glycol divinyl ether monomer with the addition of an initiator. The betaine-based shape memory polymer has thermosensitive shape memory property and wet sensitive shape memory property, and it has good biocompatibility and an excellent shape memory property, antibacterial property. It is of great potential for use in engineering, construction, daily life and medical service.