China Petroleum & Chemical Corporation

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

Huaneng Clean Energy Research Institute

Liying Zhang

Shijun Zhang

Jingbo Shao

Yiqing Bai

Dali Gao

Liqiu Chu

Jianye Liu

Yihui Xu

Hao Zou

Mu Dong

Yun Lyu

Qiang Li

Meng Xu

Hua Yin

Meifang Guo

Qingquan Yang

Yujing Tang

Baige Chou

Hao Zhang

Kai Xu

Jinliang Qiao

Peng Guo

Xin Liu

Wenbo Song

Liangshi Wang

Xiaoyu Wang

Luqiang Yu

Hongwei Shi

Huijie Hu

Mingfu Lyu

Hui Quan

Yaohui Xu

Honghong Huang

Liping Hou

Wenjun Wei

Chong Jiao

Chen Guo

Jianjun Yin

Ruxian Li

Zhaolei Wang

Ruoshi Chen

Anmin Cai

A stability measuring method for a synchronous generator includes: S11: collecting electrical quantities, and setting an alarm PQ curve of the synchronous generator; S12: calculating a dynamic reactive power reserve, an inductive dynamic reactive power reserve and a capacitive dynamic reactive power reserve of the synchronous generator; S13: calculating a dynamic reactive power reserve target value, an inductive dynamic reactive power reserve target value and a capacitive dynamic reactive power reserve target value of the synchronous generator; and S14: calculating a capacitive stability, an inductive stability and a stability of the synchronous generator.

Method for measuring degree of stability of generator and power transmission line, and electrical grid control system

A method for preparing a polyolefin resin powder has the steps of The difference between the solubility parameters of the organic solvent and of the polyolefin resin is within 0-20% of the solubility parameter of the polyolefin resin. The polyolefin resin powder obtained according to this method has good antioxidant property, good powder flowability, moderate size, smooth surface, suitable bulk density, and suitable dispersibility and particle size distribution.

Polyolefin resin powder suitable for selective laser sintering and its preparation method

A method for preparing an aliphatic polyester resin powder includes the steps of a) heat dissolving a crystalline aliphatic polyester resin in an organic solvent to obtain an aliphatic polyester resin solution; b) cooling the aliphatic polyester resin solution to precipitate a solid, thereby obtaining a solid-liquid mixture; c) optionally adding an adjuvant to the solid-liquid mixture and mixing; and d) conducting solid-liquid separation and drying to obtain an aliphatic polyester resin powder suitable for selective laser sintering. The crystalline aliphatic polyester resin powder obtained has good antioxidant property, good powder flowability, moderate size, smooth surface, suitable bulk density, and suitable dispersibility and particle size distribution. The aliphatic polyester resin powder is particularly suitable for selective laser sintering method.

Aliphatic polyester resin powder suitable for selective laser sintering and its preparation method

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

The present invention relates to a propylene-butene-1 random copolymer which has a butene-1 content of 1-6 mol % and a relative dispersity of butene-1, as determined according to NMR method, of greater than 98.5%. The propylene-butene-1 random copolymer of the present invention has a high relative dispersity of butene-1, as well as better transparency and heat resistance, so that it is more suitable for packaging food that may be edible after heating. Moreover, the copolymer has a lower xylene solubles content at room temperature. In addition, the present invention further relates to a method for preparing the copolymer and to a composition and an article comprising the copolymer.

Propylene random copolymer, method for its preparation, and compositions and articles containing the same

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Beijing, China

Liying Zhang