DURHAM, N.C. -- Researchers at Duke University and Aalto University (Finland) have constructed a "meta-mirror" device capable of perfectly reflecting sound waves in any direction. The ...

LOUISVILLE, Ky. (WAVE) - The sun is always shining bright, regardless if clouds obstruct our view or not. The Earth’s surface sometimes absorbs sunlight, while other times it reflects it. The National ...

Compared to general metal reflectors, the new product is capable of reflecting millimetre waves in a more targeted manner. As a result, there are fewer restrictions on installation, making it possible ...

THE method of studying the ionized regions of the upper atmosphere by emitting small pulses of electric waves and recording the echoes reflected from the ionosphere is now well-known and is in ...

In an era saturated with electronic devices, electromagnetic interference (EMI) poses significant risks to health, data security, and critical systems. Traditional EMI shields often reflect waves, ...

IN a previous communication 1, we gave some measurements of the performance of multilayer dielectric interference filters in the wave-length range 4000–4600 A. We are grateful to M. P. Giacomo for ...