Abstract: Vortex electromagnetic waves carrying orbital angular momentum have been widely studied in many fields because of their unique helical phase structure. The vortex electromagnetic waves can ...
Quote of the Day: On Martin Luther King Jr. Day, his powerful words from the "I Have a Dream" speech resonate as a call to action. The "Quote of the Day" from 1963 urges a move from segregation's ...
History is often remembered as a straight line of progress, marked by major achievements and defining moments. But for Neil Armstrong, the first human to walk on the Moon, the past never followed a ...
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