Abstract: We originally exploit the vortex beams with patterns of closed polygons [namely, polygonal vortex beams (PVBs)] generated by a quasi-frequency-degenerate (QFD) Yb:CALGO laser resonator with ...
Abstract: Chinese E-commerce market is increasingly saturated, fierce competition has spawned a new E-commerce model: more and more enterprises set up direct-sale stores on online shopping platforms ...
If you work or volunteer with Queensland Fire Department (QFD) you need a blue card to deliver services regulated by the blue card system. QFD protects children and young people by ensuring blue card ...
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