China Petroleum & Chemical Corporation

Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation

The Ncs Testing Technology Co., Ltd.

China Fortune Way Company

Nanjing Redwood Fine Chemical Co., Ltd.

Hongwei Shi

Jinliang Qiao

Meifang Guo

Ying Li

Jia Liu

Kai Xu

Qiang Li

Ying Zhao

Xiaohong Zhang

Peng Guo

Xiang Wang

Meng Xu

Ya Wang

Wen Wen Yang

Jianming Gao

Shijun Zhang

Zhihai Song

Gang Li

Haizhou Wang

Ling Liu

Hongbin Zhang

Xuejing Shen

Jinmei Lai

Binghai Li

Chuanlun Cai

Guicun Qi

Liangshi Wang

Hua Yin

Jingbo Shao

Luqiang Yu

Lili Liu

Liying Zhang

Mingfu Lyu

Hui Quan

Dali Gao

Yiqing Bai

Liqiu Chu

Hao Zou

Mu Dong

Yaohui Xu

Honghong Huang

Yun Lyu

Yihui Xu

Jianye Liu

Jianjun Yin

Yujing Tang

Yuexin Cong

Qianmin Zhang

Yanling Sun

Qingquan Yang

Peijun Song

Guoxun Zhao

Xiaopeng Li

Ruxian Li

Fahao Wu

Yangzhe Gao

Zhifa Yuan

Feipeng Cui

Feifei Guo

An adaptive characteristic spectral line screening method and system based on atomic emission spectrum are provided, the method includes: using a set characteristic screening optimization method to perform a plurality of optimization rounds of characteristic screening, obtaining an initialized spectral dataset of each round of the characteristic screening and initialized characteristic population genes; obtaining an optimal characteristic population gene of each round by a set analysis method, a fitness function, and an iteration of a genetic algorithm; obtaining an optimized characteristic spectral information set when the plurality of optimization rounds reach set optimization rounds; performing combination statistics and discriminant analyses on the optimized characteristic spectral information set to complete an adaptive characteristic spectral line screening. The disclosure can efficiently and automatically screen out the characteristic spectral lines that meet the analysis requirements in the complex atomic emission spectrum, thus ensuring the effectiveness and accuracy of screening the characteristic spectral lines.

Adaptive characteristic spectral line screening method and system based on atomic emission spectrum

Provided is a method for biocatalytic synthesis of Sitagliptin and intermediates thereof, in particular, provided are compounds of Formula (I) and Formula (II), or pharmaceutically acceptable salts thereof, a polypeptide capable of catalyzing conversion of a compound of Formula (I) to a compound of Formula (II), a nucleic acid encoding the polypeptide, a vector and a cell comprising the nucleic acid. In addition, also provided are a method for producing a compound of Formula (II) and Sitagliptin by using the polypeptide and the compound of Formula (I), and a method for preparing the polypeptide.

Method for biocatalytic synthesis of Sitagliptin and intermediate thereof

A polyethylene composition comprising an ethylene/&#x3b1;-olefin copolymerized linear low density polyethylene, wherein the polyethylene composition has a Mw of from 100,000 g/mol to 200,000 g/mol, a Mw/Mn of from 4.0 to 9.0, a Mz/Mw of from 4.0 to 7.0, and a Mz+1/Mw of from 4.5 to 13.5, is provided. A film formed of the polyethylene composition is also provided.

Polyethylene compositions and films formed therefrom

A rubber composition, preparation method and vulcanized rubber thereof are provided. The rubber composition comprises uncrosslinked rubber and rubber particles having crosslinked structure dispersed therein, wherein the rubber particles having crosslinked structure are synthetic rubber particles and/or natural rubber particles with an average particle size of 20 to 500 nm and a gel content of 60% by weight or higher, and the uncrosslinked rubber is styrene-butadiene rubber, and wherein the weight ratio of the rubber particles having crosslinked structure to the uncrosslinked rubber is 1:99-20:80.

Rubber composition, preparation method and vulcanized rubber thereof

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Beijing, China

Hongwei Shi