Abstract: Provided are a method of preparing a malononitrile oxime ether compound and an intermediate compound. The malononitrile oxime ether compound has a structure as shown in formula (VII), wherein W is selected from aryl or heteroaryl. The preparation method comprises: reacting a first raw material with a second raw material in the presence of a first solvent and a catalyst to obtain the intermediate compound, wherein the first raw material has a structure as shown in formula (IV), and the second raw material has a structure as shown in formula (V); and subjecting the intermediate compound, and a dehydrant to a dehydration reaction in the present of a second solvent to obtain the malononitrile oxime ether compound. Furthermore, the malononitrile oxime ether compound is obtained through one-step dehydration reaction. using the preparation method, is advantageous for improving the yield of malononitrile oxime ethers and reducing the cost.

Abstract: A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Abstract: This application provides techniques for implementing interactions in games. The techniques comprise in response to detecting that a client device associated with a player enters a plot stage of a target game, capturing a current game picture at intervals of a preset duration; obtaining a screen recording video corresponding to the target game from a video platform; determining a plot video frame that is in the screen recording video and that matches the current game picture; obtaining target bullet-screen comment information corresponding to the plot video frame from the video platform; and synchronously displaying target bullet screens in the current game picture on the client device, wherein the target bullet screens correspond to the target bullet-screen comment information.

Abstract: The present disclosure provides techniques for presenting information associated with bullet screens. The techniques comprise receiving trigger information comprising information of identifying a bullet screen and information of identifying a user who performed a trigger event for the bullet screen; determining a list of jump links associated with the bullet screen based on the information of identifying the bullet screen; determining a tag associated with the user based on the information of identifying the user; selecting a target jump link from the list of jump links based on the tag associated with the user; and transmitting information associated with the bullet screen and comprising the target jump link for display of at least one part of the information in a preset area associated with the bullet screen.

Abstract: The present disclosure provides techniques for presenting information associated with bullet screens. The techniques comprise receiving trigger information comprising information of identifying a bullet screen and information of identifying a user who performed a trigger event for the bullet screen; determining a list of jump links associated with the bullet screen based on the information of identifying the bullet screen; determining a tag associated with the user based on the information of identifying the user; selecting a target jump link from the list of jump links based on the tag associated with the user; and transmitting information associated with the bullet screen and comprising the target jump link for display of at least one part of the information in a preset area associated with the bullet screen.

Abstract: Method and apparatus for detecting obstacle based on monocular camera are provided. The method includes: obtaining a target frame image and its adjacent frame image shot by the monocular camera; deleting an unstable feature point from an initial feature point set of the adjacent frame image to obtain a preferred feature point set; dividing a target feature point set to obtain several target feature point subsets; judging whether the target feature point subset corresponds to obstacle based on a change of a distance between points within a ground projection point set of the target feature point subset from adjacent frame time instant to target frame time instant; and determining a union of all the target feature point subsets which are judged as corresponding to obstacles as an obstacle point set of the target frame image.

Abstract: Method and apparatus for detecting obstacle based on monocular camera are provided. The method includes: obtaining a target frame image and its adjacent frame image shot by the monocular camera; deleting an unstable feature point from an initial feature point set of the adjacent frame image to obtain a preferred feature point set; dividing a target feature point set to obtain several target feature point subsets; judging whether the target feature point subset corresponds to obstacle based on a change of a distance between points within a ground projection point set of the target feature point subset from adjacent frame time instant to target frame time instant; and determining a union of all the target feature point subsets which are judged as corresponding to obstacles as an obstacle point set of the target frame image.