Abstract: The present disclosure belongs to the technical field of sewage treatment, and relates to a preparation method and use of a cobalt nanoparticle/boron nitride composite. The preparation method includes the following steps: dissolving 2-methylimidazole and boric acid in deionized water, and stirring to obtain a solution A; dissolving Co(NO3)2·6H2O and Zn(NO)3·6H2O in deionized water, and conducting ultrasonic dispersion to obtain a solution B; transferring the solution B into the solution A, and stirring to form a clear and transparent solution; transferring the clear and transparent solution into a container lined with Teflon, and conducting a reaction; subjecting an obtained product to cooling, filtration, washing, and drying sequentially to obtain a precursor of the composite; and conducting roasting on the precursor in an ammonia gas atmosphere to obtain the cobalt nanoparticle/boron nitride composite with a spherical superstructure.

Abstract: The present invention relates to a method of digital film distribution and watching based on an online eye screen. A film distributor distributes film data and film broadcasting rights to a user. The user watches a film based on the film data and the film broadcasting right from the film distributor through the online eye screen. The online eye screen is a wearable display device. The present invention allows film distributors to distribute films to individuals directly, and better control the number of users per distribution right granted, and decreases the cost of film distribution. The present invention decreases piracy and infringement of films because the invention increases the difficulty of unauthorized video recording. The present invention also improves the user's visual effect and viewing experience by filtering the scene outside. The present invention allows user to watch films anywhere and at any time.

Abstract: The present invention relates to a method of digital film distribution and watching based on an online eye screen. A film distributor distributes film data and film broadcasting rights to a user. The user watches a film based on the film data and the film broadcasting right from the film distributor through the online eye screen. The online eye screen is a wearable display device. The present invention allows film distributors to distribute films to individuals directly, and better control the number of users per distribution right granted, and decreases the cost of film distribution. The present invention decreases piracy and infringement of films because the invention increases the difficulty of unauthorized video recording. The present invention also improves the user's visual effect and viewing experience by filtering the scene outside. The present invention allows user to watch films anywhere and at any time.