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Η ιστορία του οπτικού αιθέρα

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50 Scientific Inaccuracies We Were Taught In School

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New Paper Suggests Wormholes Cast Shadows We Could Easily See With Telescopes:

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Originally shared by Chris Kim A
Progress on quantum computing. This article helped me to untangle some of my confusion on the topic.

But honestly, I'm still scratching my head a bit...

HT +John Verdon

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Scientists seeking to bring #fusion — the power that drives the sun and stars — down to Earth must first make the state of matter called plasma superhot enough to sustain fusion reactions. That calls for heating the plasma to many times the temperature of the core of the sun. In #ITER, the international fusion facility being built in France to demonstrate the feasibility of fusion power, the device will heat both the free electrons and the atomic nuclei — or ions — that make up the plasma. The question is, what will this heating mix do to the temperature and density of the plasma that are crucial to fusion production?

New research indicates that understanding the combined heating shows how we could improve the production of fusion in ITER and other next-generation fusion facilities — a key finding of physicists at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), the DIII-D National Fusion Facility that General Atomics operates for the DOE, and other collaborators. “This shows what happens when electron heating is added to ion heating,” said PPPL physicist Brian Grierson, who led testing of a computer model that projected the DIII-D results to ITER.

The model, created by Gary Staebler of General Atomics and reported in a paper in Physics of Plasmas with Grierson as first author, investigated the DIII-D experimental results in conditions mimicking those expected in ITER. Diagnostics supplied by the University of Wisconsin-Madison and the University of California, Los Angeles measured the resulting turbulence, or random fluctuations and eddies, that took place in the plasma.
=> article written BY By John Greenwald, all credicts, read more at:

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In an attosecond study of the #H2 molecule #ETH physicists found that for light atomic nuclei — as contained in most organic and biological molecules — the correlation between electronic and nuclear motions cannot be ignored.
Understanding the dynamics of #quantum-mechanical systems on their natural time scale is the main goal in attosecond science. Among the most interesting systems to investigate are molecules, which have a very high degree of complexity, in particular when compared to atomic systems. So far, the few attosecond experiments performed on molecules have provided valuable insight into electron dynamics. In these studies, the dynamics of the nuclei around which the electrons evolve was assumed to be ‘frozen’, given that nuclei are much heavier than electrons and therefore move more slowly. However, even in the attosecond time regime, the approximation that electronic and nuclear motion are decoupled from one another is often not justified. In particular in molecules composed of light atomic species, the nuclear motion can be as fast as electron dynamics, resulting in a strong coupling between the two.

A team led by Dr. Laura Cattaneo and Prof. Ursula Keller at the Institute for Quantum Electronics of ETH Zurich has now studied the lightest and smallest of all molecules, H2, and explored what happens when nuclear and electronic motion happen on a comparable time scale. As they report in an article published today in Nature Physics, they found that in molecules ionization delays — the time between the absorption of a photon and the emission of an electron during photoionization — can significantly depend on the kinetic energy of both the photoelectron and the nuclei. This finding extends the concept of ionization delays introduced for atomic systems. Variations of ionization delays with the nuclear kinetic energy can be as large as variations with the electronic kinetic energy. This implies that whenever light atoms are involved in the molecular ionization process, the outgoing electron wave packet cannot be disentangled from the nuclear wave packet.
=> article written BY ETH Zurich, all credicts, read more at:

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Via +Ed Yong
"In 87 of the 115 disciplines, women are still significantly outnumbered by men. Some of these, including anthropology, microbiology, and medical genetics, will reach parity within the next decade. But others, like physics, mathematics, and computer science, not only have the highest male biases, with women being outnumbered by a factor of six, but also the slowest rates of improvement. In physics, the gender gap might take 258 years to fully close. If nothing changes, no living physicist or mathematician will see parity within their lifetime—or their grandchildren’s."

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Scientists at the University of California, Irvine made a breakthrough recently in verifying a new material configuration to facilitate cooling. In a study in the journa
Nanotechnology members of UCI,s Nano Thermal Energy Research Group highlight the attributes of holey silicon, a computer chip wafer with tiny, vertically etched orifices that work to shuttle heat to desired locations.
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