Abstract: The present invention relates to the technical field of land engineering, and relates to a water and soil resource comprehensive improvement method for loess hilly and gully region channels. The method comprises: (1) soil layer general survey: performing soil layer thickness survey and soil nutrition content measurement; (2) soil body reconstruction: on the basis of soil layer general survey data, selecting a soil body construction mode, and performing soil body profile reconstruction, soil body nutrition reconstruction and field parcel arrangement; and (3) constructing a water resource regulation and control system for the loess hilly and gully region channels. According to the present invention, investigation and survey are performed firstly, then treatment is performed, water and soil are treated simultaneously, and steps are coordinated, so that ecological treatment of the loess hilly and gully region channels is finally completed, and comprehensive improvement of water and soil resources is achieved.

Abstract: The present invention provides an optical solar collector, in which a spherical or aspheric reflector coated with specular coating is set upon the optical circuit; on the other hand, an optical concentrator is built upon the front of the spherical or aspheric reflector oppositely and directly. Due to applying above-mentioned structure, like building up spherical or aspheric reflector on the optical circuit cooperating to an optical concentrator to construct an optical collecting system, so tile solar energy can be focused on said optical concentrator through the reflecting by said spherical or aspheric reflector, meanwhile the reflecting coatings coated on the surfaces of said spherical or aspheric reflectors can reflect the useful part of the solar light to the optical concentrator, but not the harmful part (such like ultraviolet below 400 nm in wavelength) absorbed completely by it, further to transfer it into disposable energy.

Abstract: The present invention provides an optical solar collector, in which a couple of opposite spherical or aspheric reflectors coated with specular coating are set upon the optical circuit; wherein the smaller spherical or aspheric reflector is built upon the front of the bigger spherical or aspheric reflector oppositely, and a through-hole is built upon the center of the bigger spherical or aspheric reflector for passing through the light reflected by the smaller spherical or aspheric reflector, and an optical concentrator is located behind the bigger spherical or aspheric reflector aiming to the through-hole to construct an optical system; in said optical system, an aspheric flattening lens is set upon the forest of the optical circuit; said aspheric flattening lens is coated with reflection reducing coating on the surface.