University of Electronic Science and Technology of China

Sichuan University

Long Zhang

To Ngai

Chunhua Wang

Jianhui Wu

Wei Lin

Jie Hu

Kun Yang

Yizhe Zhao

A method for reflective index modulation based on intelligent reflecting surface, in which an IRS control unit is added into wireless communication system, and the data to be transmitted in a transmission is divided into two parts: a reflective domain data dand a phase-amplitude domain data d, the reflective domain data dis transmitted through a wired connection to the IRS control unit to activate or deactivate each group of reflecting elements, the phase-amplitude domain data dis modulated through traditional phase-amplitude domain modulation and transmitted to the IRS, the reflected signals contain the information of the reflective domain data d, through the demodulating the baseband symbol y, an estimated phase-amplitude modulation indexand an estimated reflective indexare obtained to recover the phase-amplitude domain data dand the value of the reflective domain data drespectively.

Method for reflective index modulation based on intelligent reflecting surface

A method for preparing a novel waterborne polyurethane foam layer for synthetic leather is disclosed. The method includes first preparing a charged cellulose nanofiber by using a wood pulp as a raw material; meanwhile, subjecting a polyisocyanate, a macromolecular diol, a hydrophilic chain extender and a small molecular chain extender to a polyaddition reaction and an acid-base neutralization reaction in sequence, to obtain a cationic or anionic waterborne polyurethane; adding the charged cellulose nanofiber and a certain amount of a crosslinking agent to the oppositely charged ionic waterborne polyurethane emulsion, stirring the resulting mixture, forming a bimolecular layer at the gas/liquid interface by a self-assembly of the cellulose nanofiber and waterborne polyurethane nanoparticles through electrostatic interactions to obtain a stable Pickering foam; using the stable Pickering foam as a template, drying and solidifying to obtain the waterborne polyurethane foam layer for synthetic leather.

Method for preparing novel waterborne polyurethane foam layer for synthetic leather

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Chengdu, China

Long Zhang