The expressway communication system is a important part of expressway. It is a credible and quick information transmission method for security running,effective transportation and scientific management. It has the characteristic of maximum exertion expressway′s security,quickness,economics,convenient and comfort,which insuring expressway get scale and society benefits. So,we must use communication resource reasonably. When it realizes expressway net planning,it is also a scale communication system.

Resource Planning

Security system

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In-situ growth of SiC nanowires@carbon nanotubes on 3D printed metamaterial structures to enhance electromagnetic wave absorption

Materials & Design (2020)

Hui Mei Wenqiang Yang Xing Zhao Yao Li Yongtao Yao

Impedance matching and attenuation principles are decisive for electromagnetic wave (EMW) absorption materials to achieve wider absorption bandwidth and higher strength absorption. By designing macrostructures to obtain metamaterials and tuning microstructures of absorption materials, impedance matching characteristic and absorption performance can be readily improved. In this paper, three-dimensional (3D) printing technology as well as precursor infiltration and pyrolysis (PIP) method were utilized to fabricate Al2O3/carbon nanotubes/SiC nanowires/SiOC composites with twisted cross metamaterial structures, where carbon nanotubes (CNTs) acted as a nucleating agent to obtain SiC nanowires (SiCnw) and as conductive phase to form conductive net structure, thus improving the dielectric and conductive loss of the composites. The Al2O3/CNT/SiCnw/SiOC composites achieved a minimum reflection coefficient (RCmin) value of −56.84 dB (99.999%) at 12.2 GHz with a thickness of 2.8 mm and the effective absorption bandwidth (EAB) ranges from 8.2–12.4 GHz with a thickness of 3.2 mm, covering the whole X-band. The excellent EMW absorption performance of the composite with metamaterial structure makes it possible to be practically applied.

Reflection loss

Dielectric loss

10.1016/j.matdes.2020.109271

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Simulation of Attitude Aberration of Downward-looking Scene Real-time Image

Jisuanji fangzhen (2006)

Xing Zhao

In downward - looking scene matching system, lots of real - time images synthesized by computer are necessary to evaluate the scene matching algorithm. Among most factors affecting the real - time image synthesis, attitude aberration caused by missile's attitudes such as yawing, pitching and rolling is one of key aberration models. The paper mainly deals with the influence of missile's attitudes in synthesizing real - time image. In the paper, based on establishing and analyzing the mathematical model, a method for simulating attitude aberration and synthesizing real - time image by the base image is dissertated. Simulation results have verified the accuracy and effectiveness of the method.

Source

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Improved ablation resistance of C/SiC-ZrB2 composites via polymer precursor impregnation and pyrolysis

Ceramics International (2017)

Xing Zhao Yiguang Wang Liuyang Duan Lei Luo Yonghong Lu

Ceramic matrix composite

10.1016/j.ceramint.2017.06.118

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Citations (44)