Abstract: The present disclosure discloses an optical imaging system. The optical imaging system comprises a lens barrel, and a lens group and at least one spacing element accommodated in the lens barrel. The lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens that are arranged in sequence along an optical axis from an object side to an image side. Here, the sixth lens has a negative refractive power. The at least one spacing element comprises a fifth spacing element that is located between the fifth lens and the sixth lens and is in contact with an image-side surface of the fifth lens.

Abstract: An optical camera lens assembly is provided, including: a lens group, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged sequentially along an optical axis from an object side to an image side, where, each of the first, the fourth, and the sixth lens has a positive refractive power, and each of the second, the third, the fifth, and the seventh lens has a negative refractive power; and a plurality of spacing elements, including a third spacing element disposed between the third lens and the fourth lens and in contact with an image-side surface of the third lens; the optical camera lens assembly satisfies: 3.0<(R3+R4)/d3s<5.0.

Abstract: An optical imaging lens assembly is provided, including: an imaging lens group, a plurality of spacing elements, and a lens barrel configured to accommodate the imaging lens group and the plurality of spacing elements comprising a third spacing element that is placed between the third lens and the fourth lens and is in contact with an image-side surface of the third lens. Here, an inner diameter d3s of an object-side surface of the third spacing element, a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 5.0<d3s/(R5+R6)<10.5.

Abstract: The present disclosure discloses a digital construction-based intelligent construction period early warning system and method, which belongs to the technical field of intelligent early warning. The system includes a digital construction module, a data calling module, an initial judgment module, an association analysis module, and an adjustment early warning module. An output end of the digital fabrication module is connected to an input end of the data calling module; an output end of the data calling module is connected to an input end of the initial judgment module; an output end of the initial judgment module is connected to an input end of the association analysis module; and an output end of the association analysis module is connected to an input end of the adjustment early warning module.

Abstract: The present invention relates to an amorphous polyolefinic ionomer and a process for the preparation of an amorphous polyolefinic ionomer.

Abstract: The present invention relates to an amorphous polyolefinic ionomer and a process for the preparation of an amorphous polyolefinic ionomer.