Abstract: An electrostatic dust collector-purifier is provided, which includes a top cover, a base, two side baffles, a front grille, and a rear grille, characterized by: a power generation mechanism, the power generation mechanism being located inside the base and including a high-voltage generator, a low-voltage terminal fixedly connected to one side of the high-voltage generator, and a ground terminal fixedly connected to one side of the high-voltage generator; a dust collection mechanism, the dust collection mechanism being located between the base and the top cover, the dust collection mechanism including a metal dust collection support and a metal electrode sheet fixedly connected to the interior of the metal dust collection support, the metal dust collection support being washable and reusable; and a filtering mechanism, the filtering mechanism being located between the base and the top cover.

Abstract: Provided are an ethylene-vinyl alcohol copolymer composition and a preparation method therefor. The composition includes an ethylene-vinyl alcohol copolymer, an alkali metal element and a carboxyl-containing material, characterized in that the carboxyl-containing material includes a mono-saturated carboxylic acid and a carboxylic acid containing a carbon-carbon double bond. The present invention can improve the yellowing resistance of an EVOH resin composition by making the EVOH resin composition contain both acetic acid and a carboxylic acid containing a carbon-carbon double bond. After heat treatment at 210° C. for 0.5 h, the yellowing index YI does not exceed 20 and the increase does not exceed 15.

Abstract: Described are an ethylene-vinyl alcohol (EVOH) copolymer composition, and a preparation method therefor. The composition contains an EVOH copolymer, element potassium, and element sodium, wherein the mass ratio of element sodium to element potassium is 0.1:1 to 1:1. By controlling the contents of element sodium and element potassium in an EVOH resin composition to fall within a specific proportion range, the heat resistance of the resulting EVOH resin composition is greatly improved, the initial decomposition temperature can be increased to 370-400° C., the maximum decomposition temperature can be increased to 400-440° C., and thus EVOH resin can adapt to the process requirement for a higher processing temperature. Moreover, further adding acyl-containing carboxylic acid and a phosphorus-containing compound/boron-containing compound can improve the thermal yellowing resistance of the EVOH resin composition, where the value of the yellowing index (YI) after 5-hour thermal treatment at 150° C.

Abstract: The present invention relates to methods and compositions for assessing copy number of a target polynucleotide in a sample, methods and compositions for establishing a standard curve for a target polynucleotide, and the uses of the methods and compositions for detecting a pathogen, e.g., human papillomavirus (HPV).

Abstract: The present invention relates to methods and compositions for assessing copy number of a target polynucleotide in a sample, methods and compositions for establishing a standard curve for a target polynucleotide, and the uses of the methods and compositions for detecting a pathogen, e.g., human papillomavirus (HPV).