University of Illinois

Petrochina Company Limited

Shenghui Zhang

Liang Cui

Jianjun Yi

Jennifer T Bernhard

Gregory Hilding Huff

Kefeng Wang

Haijun Hao

Shisheng Zhao

Garvin Cung

Junpeng Zhuang

Xilai Zhang

Junyu Lei

The present disclosure discloses an arylaminosilane compound, a propylene polymerization catalyst and preparation thereof. The arylaminosilane compound has a structure of wherein Ris a C-Calkyl group or a C-Csilanyl group; R, R, R, Rand Rare each independently H or a C-Calkyl group; R, Rand Rare each independently a C-Calkyl group or a C-Calkoxy group. When the arylaminosilane compound is used as an external electron donor of a propylene polymerization catalyst in propylene polymerization reaction, the catalyst has good hydrogen response.

Arylaminosilane compound, propylene polymerization catalyst and preparation thereof

An antenna device includes a dielectric layer, an electrical ground layer carried on one side of the dielectric layer, and an antenna arrangement carried on another side of the dielectric layer. This arrangement includes two parasitic microstrip elements and a microstrip signal element. The signal element is structured to radiate an electromagnetic signal in response to application of a corresponding electrical communication signal. The parasitic antenna elements extend along opposing longitudinal sides of the signal element and each includes an adjustable component operatively connected between two microstrips. The adjustable component is structured to selectively adjust operable length of a selected one of the parasitic antenna elements to change a maximum radiation direction of the antenna device.

Reconfigurable, microstrip antenna apparatus, devices, systems, and methods

Growing community of inventors

Beijing, China

Shenghui Zhang