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As the COVID-19 pandemic continues to spread across the world, testing remains a key strategy for tracking and containing the virus.
Electric space propulsion systems use energized atoms to generate thrust. The high-speed beams of ions bump against the graphite surfaces of the thruster, eroding them a little more with each hit, and are the systems' primary lifetime-limiting factor.
Beneath the water鈥檚 surface lays a hidden world: one that cannot be perceived by the human eye. When viewed through a special camera, however, rich polarization patterns are unveiled. These patterns can be used as an alternative approach to geolocation- the process of determining the geographic position of an object.
In an experiment on how turbulent boundary layers respond to acceleration in the flow around them, aerospace engineers at the University of Illinois Urbana-Champaign observed an internal boundary layer that fundamentally changed the behavior of the flow from what would have been expected without it.
In 1956, theoretical physicist David Pines predicted that electrons in a solid could form a composite particle called a demon. It's eluded detection since its prediction....until now.
There is a largely untapped energy source along the world鈥檚 coastlines: the difference in salinity between seawater and freshwater. A new nanodevice can harness this difference to generate power.
The ability to have access to the Internet or use a mobile phone anywhere in the world is taken more and more for granted, but the brightness of Internet and telecommunications satellites that enable global communications networks could pose problems for ground-based astronomy.
Atoms of the metal ytterbium-171 may be the closest things in nature to perfect qubits. A recent study shows how to use them for repeated quantum measurements and qubit rotations, which may aid in the development of scalable quantum computing.
Just like a book can鈥檛 be judged by its cover, a material can鈥檛 always be judged by its surface. But, for an elusive conjectured class of materials, physicists have now shown that the surface previously thought to be 鈥渇eatureless鈥� holds an unmistakable signature that could lead to the first definitive observation.
Coal is an abundant resource in the United States that has, unfortunately, contributed to climate change through its use as a fossil fuel.
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