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Yang Bo,Qing Wang,Jinyu Wang,Yan Cai,Wencheng Yue,Shuxiao Wang,Wei Wang,Mingbin Yu 한국광학회 2023 Current Optics and Photonics Vol.7 No.2
We propose a highly directional waveguide grating antenna for an optical phased array, achieving high directionality of more than 97% by interleaving the trenches with different etching depths in the silicon nitride layer, and adopting a multilayered structure. Meanwhile, the multilayered structure reduces the perturbation strength, which enables a centimeter-scale radiation length. The beam-steeringrange is 13.2°, with a wavelength bandwidth of 100 nm. The 1-dB bandwidth of the grating is 305 nm. The multilayered grating structure has a large tolerance to the fabrication variation and is compatible with CMOS fabrication techniques.
Implementing the Minamata Convention on Mercury: Will China Deliver?
Gørild Heggelund,Kristin Rosendal,Steinar Andresen,Eirik H. Steindal,Yan Lin,Shuxiao Wang,Haibin Zhang 경남대학교 극동문제연구소 2022 ASIAN PERSPECTIVE Vol.46 No.2
China has undertaken a major shift in its position on mercury as an environmental problem over the last decade and a half. It ratified the Minamata Convention (MC) in 2016 and by doing so has committed to implement the treaty objectives. This article asks: How do we explain China’s will and ability to implement its MC obligations? There is little systematic knowledge about the main factors underlying implementation of international mercury objectives in China, hence this article contributes new research on this important topic. We examine the implementation process, focusing on the coal sector and differentiate between indirect effects from other policies and direct efforts to implement obligations. We find that China has moved toward stricter regulation of mercury emissions and direct implementation of the Minamata Convention in the coal sector. However, our study shows that local implementation capacity needs improvement.