Using radio telescopes observing distant stars, scientists have connected optical atomic clocks on different continents. The results were published in the scientific journal Nature Physics by an international collaboration between 33 astronomers and clock experts at the National Institute of Information and Communications Technology (NICT, Japan), the Istituto Nazionale di Ricerca Metrologica (INRIM, Italy), the Istituto Nazionale di Astrofisica (INAF, Italy), and the Bureau International des Poids et Mesures (BIPM, France).
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The BIPM in Sèvres near Paris routinely calculates the international time recommended for civil use (UTC, Coordinated Universal Time) from the comparison of atomic clocks via satellite communications. However, the satellite connections that are essential to maintaining a synchronized global time have not kept up with the development of new atomic clocks: optical clocks that use lasers interacting with ultracold atoms to give a very refined ticking. “To take the full benefit of optical clocks in UTC, it is
Nuclear clocks could make our time measurement even more accurate than atomic clocks. The key to this lies in thorium-229, an atomic nucleus whose lowest excited state has very low energy. A research team from the Kirchhoff Institute for Physics at the University of Heidelberg, TU Wien, Johannes Gutenberg University Mainz (JGU), the Helmholtz Institute Mainz (HIM), and GSI Helmholtzzentrum in Darmstadt has now succeeded in measuring this low energy. Using an extremely accurate detector, it was possible to detect the tiny temperature increase due to the energy released during the de-excitation of the atomic nucleus. This brings the realization of a nuclear clock a big step closer.
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In radioactive decay, atomic nuclei spontaneously re-arrange, eject some part of their building blocks, and transform into a nucleus of a different atom. In this process, the new “daughter atom” usually has internally stored energy that is released in the form of
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- Study shows graphene moves in a back and forth manner similar to how electrons behave in a circuit
- Physicists invent a circuit that can convert energy from graphene into an electrical current
- The study result has became significant in today’s search for a clean energy source
The world may soon have a clean and limitless energy source powered by a circuit that harvests electricity from the atomic motion of graphene. The technology comes in the form of small chips that have the potential of replacing disposable energy sources and saving people from the lifetime purchase of small batteries.
A team of physicists from the University of Arkansas presented their invention of a circuit that can capture the thermal motion of graphene and convert it into an electrical current. The study, published in the journal Physical Review E, explored a finding three years ago that first identified graphene as
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Sep 28, 2020 (Heraldkeepers) —
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