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 teaching relates to placing sponsored search results based on correlation of the sponsored search results. A search query is first received at a search engine from a user. One or more keywords are further extracted from the search query. A plurality of sponsored search results related to the one or more keywords are received in response to the search query. The placement of the plurality of sponsored search results are further determined based on correlation of the plurality of sponsored search results, and a search results page containing the plurality of sponsored search results are presented to the user.

Abstract: The present teaching relates to placing sponsored search results based on correlation of the sponsored search results. A search query is first received at a search engine from a user. One or more keywords are further extracted horn the search query. A plurality of sponsored search results related to the one or more keywords are received in response to the search query. The placement of the plurality of sponsored search results are further determined based on correlation of the plurality of sponsored search results, and a search results page containing the plurality of sponsored search results are presented to the user.