Abstract: Disclosed is a microwave chemical method for totally extracting fluorine and rare earth from bastnaesite concentrate, including: alkaline conversion defluorination of bastnaesite through microwave irradiation, microwave-assisted leaching of fluorine, solid-liquid separation of leaching solution and microwave-assisted leaching of rare earth. The rare earth hydrochloric acid solution for leaching contains no fluorine ion, so that the fluorine interference of subsequent processes such as impurity removal can be completely avoided; the fluorine and the rare earth are leached with microwaves, which does not need the stirring, so that the automatic control is easy to implement; the fluorine and rare earth leaching speed is high, the leaching time is short and the complete leaching of fluorine and little residual alkali in the slag can be realized by two-time leaching; and no fluorine-containing waste water is discharged, and the total extraction of the rare earth can be realized by one-time leaching.

Abstract: The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. At least one of the first lens to the seventh lens is a glass lens. The third lens has positive refractive power, and an image-side surface of the third lens is a convex surface. An object-side surface of the seventh lens is a convex surface, and an image-side surface of the seventh lens is a concave surface. A maximum field-of-view FOV of the optical imaging lens assembly satisfies FOV?134.56°. An effective half-aperture DT62 of an image-side surface of the sixth lens and an effective half-aperture DT72 of the image-side surface of the seventh lens satisfy 0.54?DT62/DT72.

Abstract: The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. At least one of the first lens to the seventh lens is a glass lens. The third lens has positive refractive power, and an image-side surface of the third lens is a convex surface. An object-side surface of the seventh lens is a convex surface, and an image-side surface of the seventh lens is a concave surface. A maximum field-of-view FOV of the optical imaging lens assembly satisfies FOV?134.56°. An effective half-aperture DT62 of an image-side surface of the sixth lens and an effective half-aperture DT72 of the image-side surface of the seventh lens satisfy 0.54?DT62/DT72.

Abstract: A method, a device, and a system for implementing a video call are provided. The method includes: when a video call initiated by a calling party is received, performing media negotiation with the calling party and initiating the video call to a called party; and after the called party makes a response, performing media negotiation with the called party and completing establishment of a video voice channel between the calling party and the called party; and when an indication of the calling party and/or the called party is received, processing a video according to the indication. With the method, device, or system of the present invention, the calling and called users can change video contents viewed by the other party or by himself/herself, which provides the capability of actively controlling the video contents for the calling and called users that conduct a video call and improves the users' interactive capability during the video call.

Abstract: A method, a device, and a system for implementing a video call are provided. The method includes: when a video call initiated by a calling party is received, performing media negotiation with the calling party and initiating the video call to a called party; and after the called party makes a response, performing media negotiation with the called party and completing establishment of a video voice channel between the calling party and the called party; and when an indication of the calling party and/or the called party is received, processing a video according to the indication. With the method, device, or system of the present invention, the calling and called users can change video contents viewed by the other party or by himself/herself, which provides the capability of actively controlling the video contents for the calling and called users that conduct a video call and improves the users' interactive capability during the video call.