jeudi 17 août 2023

SCIENCES ETC /REPRISE LENTE DES TRADUCTIONS /PROBLEMES INFORMATIQUES A RSOUDRE

Dear olivier hartmanshenn,

Here is your customized Science X Newsletter for week 32:

Smoking-gun evidence for modified gravity at low acceleration from Gaia observations of wide binary stars

A new study reports conclusive evidence for the breakdown of standard gravity in the low acceleration limit from a verifiable analysis of the orbital motions of long-period, widely separated, binary stars, usually referred to as wide binaries in astronomy and astrophysics.

Testing of Vlad the Impaler's letters show he may have had condition causing his tears to be mixed with blood

A team of chemical scientists from the University of Catania, SpringStyle Tech Design Ltd, Romania National Archives and Politecnico di Milano, Via Mancinelli, has found evidence suggesting that Vlad the Impaler, may have suffered from a variety of ailments, including one that could have made the famous prince cry tears mixed with blood. In their paper published in the journal Analytical Chemistry, the group describes their analysis of proteins and peptides from three letters written by Vlad Drăculea and what they learned from them.

Scientists observe first evidence of 'quantum superchemistry' in the laboratory

A team from the University of Chicago has announced the first evidence for "quantum superchemistry"—a phenomenon where particles in the same quantum state undergo collective accelerated reactions. The effect had been predicted, but never observed in the laboratory.

Webb telescope reveals colors of Earendel, most distant star ever detected

Detecting extremely distant stars, or those closest in time to the big bang, can provide insights into the first few chapters of the history of our universe. In 2022, the Hubble Space Telescope broke its own record, and spotted the most distant star yet. This star, nicknamed Earendel, emitted its light within the universe's first billion years.

Demon hunting: Physicists confirm 67-year-old prediction of massless, neutral composite particle

In 1956, theoretical physicist David Pines predicted that electrons in a solid can do something strange. While they normally have a mass and an electric charge, Pines asserted that they can combine to form a composite particle that is massless, neutral, and does not interact with light. He called this particle a "demon." Since then, it has been speculated to play an important role in the behaviors of a wide variety of metals. Unfortunately, the same properties that make it interesting have allowed it to elude detection since its prediction.

Physicists open new path to an exotic form of superconductivity

Physicists have identified a mechanism for the formation of oscillating superconductivity known as pair-density waves. Physical Review Letters published the discovery, which provides new insight into an unconventional, high-temperature superconductive state seen in certain materials, including high-temperature superconductors.

Stellar surf's up: Monster waves as tall as three suns are crashing upon a colossal star

An extreme star system is giving new meaning to the phrase "surf's up."

The temperature the human body cannot survive

Scientists have identified the maximum mix of heat and humidity a human body can survive.

Tiny 'ice mouse' survived Arctic cold in the age of dinosaurs

Paleontologists working in northern Alaska have discovered a tiny fossil mammal that thrived in what may have been among the coldest conditions on Earth about 73 million years ago.

Physicists demonstrate how sound can be transmitted through vacuum

The classic film "Alien" was once promoted with the tagline "In space, no one can hear you scream." Physicists Zhuoran Geng and Ilari Maasilta from the Nanoscience Center at the University of Jyväskylä, Finland, have demonstrated that, on the contrary, in certain situations, sound can be transmitted strongly across a vacuum region.

Is this the protein plant of the future? New study finds 'sweetness gene' that makes lupins tastier

If you walk into a bar in Italy, you might be served a dish of salty, nutritious snacks: lupin beans, a legume that has been eaten around the Mediterranean and in parts of the Middle East and Africa for thousands of years.

Whale like filter-feeding discovered in prehistoric marine reptile

A remarkable new fossil from China reveals for the first time that a group of reptiles were already using whale-like filter feeding 250 million years ago.

Chemical contamination on International Space Station is out of this world, study shows

Concentrations of potentially harmful chemical compounds in dust collected from air filtration systems on the International Space Station (ISS) exceed those found in floor dust from many American homes, a new study reveals.

New research links early Europeans' cultural and genetic development over several thousand years

A new DNA study has nuanced the picture of how different groups intermingled during the European Stone Age, but also how certain groups of people were actually isolated. The study was carried out by researchers at Uppsala University working with an international team of researchers, who produced new genetic data from 56 Central and Eastern European individuals from the Stone Age. The results have been published in the journal Communications Biology.

After 15 years, pulsar timing yields evidence of cosmic background gravitational waves

The universe is humming with gravitational radiation—a very low-frequency rumble that rhythmically stretches and compresses spacetime and the matter embedded in it.

Nile crocodiles found to respond to baby cries from assortment of mammals, including humans

A team of bioacoustics researchers at the University of Saint-Etienne in France, working with a colleague from University Lyon, has found that Nile crocodiles respond to an assortment of baby mammal cries, including humans. In their study, reported in the journal Proceedings of the Royal Society B: Biological Sciences, the group tested crocodile reactions to recordings of babies crying at CrocoParc in Agadir, Morocco.

Study suggests rise in global photosynthesis rate due to increase in carbon dioxide has slowed

A team of Earth scientists at the Chinese Academy of Agricultural Science's Grassland Research Institute, working with colleagues from several institutions in the U.S., has found evidence that the rise in photosynthesis rates around the world caused by the increase of carbon dioxide, has slowed dramatically. In their research, reported in the journal Science, the group measured changes in global photosynthesis rates over the past several decades.

Longest time-lapse footage of an exoplanet to date assembled from real data

A Northwestern University astrophysicist has created the longest time-lapse video of an exoplanet to date.

Archaeologists refute claims that a comet destroyed Hopewell culture

In February 2022, the journal Scientific Reports published a paper with the claim that a comet exploded over what is now Cincinnati around 1,500 years ago, raining fire over the area and destroying villages and farm fields, supposedly resulting in the rapid decline of the ancient Indigenous Hopewell culture.

A quantum leap in mechanical oscillator technology

Over the past decade, scientists have made tremendous progress in generating quantum phenomena in mechanical systems. What seemed impossible only fifteen years ago has now become a reality, as researchers successfully create quantum states in macroscopic mech

 

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