Nanjing University of Aeronautics and Astronautics

Hohai University

Jiangxi University of Science and Technology

Jiangsu Dongjiao Intelligent Control Technology Group Co., Ltd.

Li Wei

Jie Wang

Shilong Pan

Maosen Cao

Tongfa Deng

Wenquan Che

Dragoslav Sumarac

Nizar Faisal Alkayem

Drahomir Novak

Lei Shen

Wanchen Yang

Jinghao Li

Xiangdong Qian

Xiangchuan Wang

Lihan Wang

The provided is a germanium telluride-based reflectarray element and millimeter-wave frequency-reconfigurable reflectarray antenna. The reflectarray antenna includes a plurality of reflectarray elements, a dielectric substrate, a metal ground, and a feed source, where the reflectarray element is located on an upper surface of the dielectric substrate, and includes a loop body and two phase delay lines; two first germanium telluride films are embedded in the loop body to divide the loop body into two parts with equal lengths; each part of the loop body is connected to a middle portion of one phase delay line; two second germanium telluride films are embedded in the phase delay line; the two second germanium telluride films are symmetrically distributed up and down with the middle portion of the phase delay line as a center.

Germanium telluride-based reflectarray element and millimeter-wave frequency-reconfigurable reflectarray antenna

An evaluation method for corrosion damage evolution of underwater concrete structures includes performing the time reversal test on the concrete beam specimen placed in the water, performing the uniaxial compression test on the concrete cube specimens; immersing the concrete beam specimen and the concrete cube specimens in a hydrochloric acid solution, and performing the time reversal test on the concrete beam specimen on the 10th, 20th and 30th days respectively. At the same time, a concrete cube specimen is taken out to perform the uniaxial compression test on the 10th, 20th and 30th days respectively; and using the above calculation results to evaluate the corrosion evolution process thereof without damaging the underwater concrete structure.

Evaluation method for corrosion damage evolution of underwater concrete structures

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Nanjing, China

Li Wei