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In this work, the vanadium dioxide is introduced into a mirror-symmetric double splitting semicircle ring resonator to constitute a tunable metasurface mode switch between the Fano resonance and Breit-Wigner resonance, which is controlled by two external temperatures. The numerical simulation results show that the proposed metasurface expresses the Fano resonance around 1258 nm when the temperatures are T1=27 ℃ and T2=82 ℃. When T1= T2 =27 ℃ or 82 ℃, the Breit-Wigner resonance mode can be excited near 1100 nm. This mode switch behavior can be well understood with the surface current distribution and multipole electromagnetic decomposition.

It is necessary for the whole project stakeholders to improve the level of construction safety management, which includes the owner, designer, contractor, construction supervisor, government regulators and other parties. With respect to the research about construction project safety, existing literatures mainly consider about contractor, construction supervisor and other parties. However, Design stage is the key point of affecting the construction safety management and more attention should be paid. Design stage provides the basis to control the project safety risks in construction stage. Aiming to give better play for designers in construction safety management, this paper probed project safety management system, suggested the approach of designer roles in construction project safety management, analyzed the challenges if designer took part in construction safety management, and gave some countermeasures on how to take advantage of the designer in improving the level of construction safety.

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