Abstract: Disclosed is an angularly adjustable Fresnel turning lens, including a lens body, where one side surface of the lens body is a surface A, and the other side surface of the lens body is a surface B, where a convex cambered surface is provided at a middle position of the surface A, and a third convex surface, a second convex surface, and a first convex surface are provided successively at an outer side of the convex cambered surface; a concave cambered surface is arranged at a middle position of the surface B. An implementation method of the angularly adjustable Fresnel turning lens is also disclosed. In the present disclosure, a light-emitting angle may be adjusted only by turning the lens body, and compared with the focusing mode in the related art, this lens has the features of a smaller amount of material and a smaller weight and volume, thereby reducing the cost of the lens.

Abstract: A lens capable of rotatably adjusting a light emitting angle is disclosed, and the lens includes a lens body, where the lens body is provided with a plurality of lens rings in an equal spacing manner from inside to outside; each lens ring includes a plurality of first lens portions and a plurality of second lens portions, which are alternatively arranged and have different light emitting angles; and the first lens portions and the second lens portions on two adjacent lens rings are staggered. An optical system capable of rotatably adjusting a light emitting angle and an implementation method for the optical system capable of rotatably adjusting a light emitting angle are further disclosed. The lens body is matched with a light source plate.

Abstract: Disclosed are an abietane type diterpene compound, a preparation method and an application thereof, relating to the technical field of anti-tumor compounds, where the compound has a chemical structure as shown in the following formula I: Leucosceptrum canum is extracted to prepare the abietane type diterpene compound according to the present application, and the prepared compound is effectively applied in inhibiting human lung cancer cell A549 and human myeloid leukemia cell HL-60.

Abstract: Disclosed are an abietane type diterpene compound, a preparation method and an application thereof, relating to the technical field of anti-tumor compounds, where the compound has a chemical structure as shown in the following formula I: Leucosceptrum canum is extracted to prepare the abietane type diterpene compound according to the present application, and the prepared compound is effectively applied in inhibiting human lung cancer cell A549 and human myeloid leukemia cell HL-60.