Abstract: The disclosure discloses an irreversible covalent organic framework for efficient and selective gold recovery and a preparation method thereof, and belongs to the technical field of precious metal recovery from an aqueous solution. In the disclosure, metal trifluoromethanesulfonate is used as a catalyst, and a solvothermal method is used to prepare a mother covalent organic framework, and then the corresponding structural unit is used to perform an exchange reaction to prepare an irreversible amide-linked covalent organic framework material. The disclosure solves the problem of preparation of high-stability irreversible covalent organic framework, the introduced amide bond gives the covalent organic framework the ability to quickly and selectively recover precious metal gold from an aqueous solution, and the covalent organic framework can be used repeatedly.

Abstract: A pixel circuit, a driving method, a display substrate, and a display device are provided. The pixel circuit includes a driving circuit, a first light-emitting control circuit, a light-emitting element, a first initialization circuit, and a second initialization circuit. The first initialization circuit writes, under the control of a first initialization control signal, an initialization voltage provided by an initialization voltage line, to a control terminal of the driving circuit; the second initialization circuit writes, under the control of a second initialization control signal provided by a second initialization control line, an initial data voltage provided by an initial data line, to an anode of the light-emitting element. Light emission of the light-emitting element from a leakage current and lateral leakage at low gray scales caused when initializing the anode of the light-emitting element can be prevented.

Abstract: The present invention relates to a flame retardant and iodine stain resistant topcoat composition comprising: a thermoplastic component including one or both of ethylene vinyl acetate resin and chloride vinyl acetate resin; and a radiation curable component including one or more acrylic oligomers and one or more acrylic monomers. The present invention further relates a method of coating at least a portion of a substrate with the topcoat composition and a substrate being at least partially coated with the topcoat composition. The present invention further discloses a flame retardant topcoat composition, comprising an alumina pigment; and a radiation curable component including one or more acrylic oligomers and one or more acrylic monomers.

Abstract: The present invention relates to anti-slip coatings comprising resin, diluent, PMU particles and photo-initiator. The present invention also relates to the preparation of anti-slip coatings, methods for applying anti-slip coatings, and substrates coated with such anti-slip coatings.

Abstract: An electrical connector is provided and includes an insulating body, a plurality of signal terminals, and a plurality of ground terminals. The insulating body includes a slot extending therein. The signal terminals are positioned in the insulating body and configured in pairs along a width of the slot to form a plurality of signal terminal units. Each signal terminal unit includes a pair of signal contact portions positioned opposite each other with respect to the slot and a pair of signal terminal pins positioned opposite the pair of signal contact portions. The ground terminals are positioned in the insulating body and configured in pairs along the width of the slot as a plurality of ground terminal units. Each ground terminal unit includes a pair of ground contact portions located on opposite sides of the slot and arranged sequentially in alternation with the pair of signal contact portions along a length of the slot.

Abstract: The present invention relates to anti-slip coatings comprising resin, diluent, PMU particles and photo-initiator. The present invention also relates to the preparation of anti-slip coatings, methods for applying anti-slip coatings, and substrates coated with such anti-slip coatings.

Abstract: An electrical connector is provided and includes an insulating body, a plurality of signal terminals, and a plurality of ground terminals. The insulating body includes a slot extending therein. The signal terminals are positioned in the insulating body and configured in pairs along a width of the slot to form a plurality of signal terminal units. Each signal terminal unit includes a pair of signal contact portions positioned opposite each other with respect to the slot and a pair of signal terminal pins positioned opposite the pair of signal contact portions. The ground terminals are positioned in the insulating body and configured in pairs along the width of the slot as a plurality of ground terminal units. Each ground terminal unit includes a pair of ground contact portions located on opposite sides of the slot and arranged sequentially in alternation with the pair of signal contact portions along a length of the slot.