4results about How to "Protect resources" patented technology

This invention discloses a method for separating fluorosilicic acid and hydrofluoric acid using an anion exchange membrane, comprising the following steps: adding a flocculant to a fluorosilicic acid-hydrofluoric acid mixture, aging it, then adding a desulfurizing agent to carry out a desulfurization reaction to obtain a mixed solution, adding the mixed solution to the feed side of an anion exchange membrane for membrane separation, and obtaining a hydrofluoric acid solution with a mass concentration of 2-30% on the clear water side after separation. This invention uses a flocculant to rapidly settle solids such as sodium fluorosilicate and potassium fluorosilicate in the fluorosilicic acid-hydrofluoric acid mixture, uses a desulfurizing agent to remove sulfuric acid, and then uses an anion exchange membrane to effectively separate fluorosilicic acid and hydrofluoric acid in the fluorosilicic acid-hydrofluoric acid mixed solution. The hydrofluoric acid separated by membrane separation has high purity and high output value, increases the utilization rate of by-product hydrofluoric acid, and reduces costs.

The invention provides a standing tree cutting degree parameter automatic inversion method based on a ground-based laser radar and deep learning, and relates to the technical field of forest tree measurement. The method comprises the following steps: acquiring an original three-dimensional laser point cloud based on multi-station scanning, and acquiring a clean trunk point cloud; and generating a high-density diameter-height observation data set through axial skeletonization extraction and slicing processing in combination with circle fitting calculation. A variable parameter cutting degree equation model introducing a relative tree height ratio and a height-diameter ratio factor is constructed, and a residual sum of squares objective function is established; and iteratively solving the optimal shape parameter vector by using a nonlinear least square algorithm, and outputting a model parameter of the target stumpage when a precision evaluation index is met. According to the method, the problem of measurement errors caused by branch and leaf shielding in a complex under-forest environment is effectively solved, a traditional destructive survey mode of cutting down and analyzing trees is replaced, non-destructive, high-precision and automatic inversion of standing tree cutting degree parameters is achieved, and the efficiency and the digital level of forest resource monitoring are improved.

This invention provides an experimental device and method for attracting, blocking, guiding, and enticing fish. The bottom center of the experimental fish tank is hinged to a base. Multiple lifting devices connect the fish tank to the base on both sides of the hinge point. One end of the fish tank has an outlet, and the other end has a return channel, which is connected to the outlet via a pump to form a circulation system. A sliding experimental platform is mounted on the fish tank, and the experimental device for attracting, blocking, guiding, and enticing fish is installed on the platform. Fish-blocking nets are installed inside the fish tank and on both sides of the platform. This helps us better understand how to protect marine and freshwater ecosystems. In summary, the purpose of constructing this experimental device for attracting, blocking, guiding, and enticing fish is to protect fishery resources and the ecological environment, and to promote sustainable development.

This invention discloses a method for artificially cultivating large-flowered sesame, comprising the following steps: S1, preparing the seedbed: After tilling the land, make raised beds and evenly spread well-rotted organic fertilizer on the bed surface; thoroughly water the bed surface, stir the surface soil into a thin mud, and scrape it smooth to create a slurry; S2, sowing: On the slurry bed surface, sow the seeds or tubers of the host plant, tiger nut, at a spacing of 10-15 cm, and evenly scatter the large-flowered sesame seeds on the muddy bed surface; S3, seedling management: Immediately after sowing, construct an arched shed, controlling the light transmittance at 40%-50%; ventilate in the morning and evening 20-30 days after emergence; remove the arched shed after 45-60 days and remove weeds; maintain the relative soil moisture content of the bed surface at 60%-80%. The advantages of this invention are: effectively increasing the yield of large-flowered sesame, achieving a double harvest of large-flowered sesame and tiger nut.