Abstract: An inverter and a method for detecting insulation impedance of the inverter are provided. During grid-connected operation of the inverter, the method includes: controlling a power supply to output two different test signals, and recording voltages of a power grid to ground corresponding to the two test signals; and calculating the insulation impedance to ground of the inverter during the grid-connected operation of the inverter according to the two test signals and the voltages of the power grid to ground corresponding to the two test signals. According to the present disclosure, the power supply outputs different test signals to disturb the voltage of the power grid to ground, so as to detect insulation impedance of the inverter during grid-connected operation of the inverter.

Abstract: The invention provides a solid material for air purification and disinfection and a preparation method and application thereof. The solid material includes: 50-60 wt. % of inorganic porous materials, 10-20 wt. % of nano titanium dioxide, 3-5 wt. % of fluorescent materials, 20-30 wt. % of sodium chlorite, 3-5 wt. % of sodium lignosulfonate, 1-10 wt. % of polyethylene glycol, and 1-10 wt. % of polyvinyl alcohol. The method for preparing the solid material includes: formulating the fluorescent material into a slurry by using a polyethylene glycol aqueous solution; uniformly mixing the nano titanium dioxide, the sodium lignosulfonate, and the fluorescent material formulated into the slurry, and then spraying the mixture on an inorganic porous material carrier to be uniformly adsorbed; and mixing the sodium chlorite with the above mixture for granulation to obtain the product.

Abstract: Disclosed is a process for producing biomass fiber molding material, and relates to the technical field of biological fibers. In the present disclosure, pretreated dried leaf fibers are softened by being subjected to a soaking process; the leaf fibers are grounded through a high-concentration grinder to obtain primary pulp of biomass fiber molding material; and then excess water is removed from the primary pulp of biomass fiber molding material through a pulp squeezing thickener to obtain the biomass fiber molding material. The primary pulp of biomass fiber molding material obtained by the production process of the present disclosure meets the specification for manufacturing safe paper, water is recycled in the production process to reduce water resource consumption; and the adding of auxiliary agents is reduced, which can reduce the cleaning of the product and improve the utilization rate of the leaf fibers.