5 results about "Environmental resistance" patented technology

This invention discloses a controlled-release nitrogen fertilizer containing organic acid salt signaling substances. From the inside out, it comprises urea particles, a cross-linked material-trace element mixture, molten urea, and a bio-based polyurethane coating material. The cross-linked material-trace element mixture is a porous cross-linked material loaded with trace elements. The porous cross-linked material is obtained by cross-linking alginic acid and organic acid salts through a cross-linking agent. The organic acid salts are selected from at least one of sodium citrate, sodium fumarate, sodium maleate, sodium malonate, and sodium succinate. The trace elements are selected from at least one of zinc, cobalt, molybdenum, and iron. This invention, through alginic acid-organic acid salt cross-linking, precise loading of trace elements, and multi-layer coating technology, produces a novel controlled-release fertilizer that combines pH responsiveness, environmental resistance, and high nutrient utilization. Nutrient release can be dynamically controlled according to soil pH and crop needs, reducing nutrient loss and environmental pollution, meeting the needs of green agriculture development, and providing an innovative solution for improving fertilizer utilization and crop yield.

The present application belongs to the technical field of metal material protection, and specifically discloses an environment-friendly self-film-forming spray and coating with antimicrobial adhesion integrated with polylactic acid and palytoxin II, wherein the spray is obtained by completely dissolving palytoxin II into a dichloromethane solution of polylactic acid; and wherein 20-40 mL of the dichloromethane solution of polylactic acid contains 0.5-1.5 g of polylactic acid, and 10-30 mg of palytoxin II is added accordingly. By introducing palytoxin II into the polylactic acid solution dissolved in dichloromethane, the polylactic acid and palytoxin II are co-dissolved, and the obtained solution system can self-form a film in air, and the obtained coating can resist bacteria and prevent fouling, and is especially suitable for corrosion-resistant treatment of metal pipes. Compared with the related prior art of pure polylactic acid coating, the present application can effectively improve the environmental resistance, anti-bioadhesion property, hydrophobicity and protection of the substrate material of the polylactic acid coating.

This invention discloses a three-dimensional graphene oxide composite foam material with both antibacterial and high uranium selectivity, and its preparation method, belonging to the fields of environmental functional materials and seawater uranium extraction technology. Using graphene oxide (GO) as the matrix, this invention introduces superhydrophilic polyethyleneimine (PEI), highly uranium-selective poly(amine oxime) (PAO), and guanidine phosphate polymer (PGdn) with both antibacterial and uranium coordination capabilities, and prepares the GO-PEI-PAO-PGdn (GPP-PGdn) composite foam material through a one-step covalent cross-linking method. The material prepared by this invention has a three-dimensional interconnected porous structure, superhydrophilic properties, and excellent uranium selectivity. The uranium partition coefficient Kd value in natural seawater reaches as high as 18250 mg / L, and the uranium removal rate reaches 87.65%, achieving highly selective uranium enrichment. Simultaneously, it has significant antibacterial effects against Escherichia coli and Staphylococcus aureus, effectively solving the problem of biofouling during seawater uranium extraction. The material prepared by this invention has a mild and controllable process that can be scaled up and can be widely used in fields such as trace uranium enrichment and uranium-containing radioactive wastewater treatment. It also has excellent adsorption performance, cycle stability and environmental resistance.

The invention discloses a shrimp breeding yield increasing method and system based on staged growth management. By acquiring behavior and physiological change data of shrimps in different growth stages, the resistance of the shrimps to environmental change is evaluated, so that refined growth management stages are divided. Further combining the release characteristics of the bottom mud released substances of the target culture pond, performing correlation analysis with the environmental resistance of the shrimps in each stage, constructing a corresponding matrix of the management stage and the bottom mud influence, and quantifying the fitness index of the shrimps to the bottom mud released substances in each stage. When the fitness index is lower than a safety threshold value, bottom mud state information is obtained, a bottom mud regulation and control mode is determined, then bottom mud regulation and control strategies of all stages are formulated, and dynamic regulation and control and optimization of the breeding environment are achieved. The method can effectively improve the growth efficiency and culture yield of the shrimps, and has high practical value and popularization prospect.