New observations could boost understanding of multiple-impurity systems such as Kondo lattices, spin glasses and high transition-temperature superconductors.
Kondo cloud seen at last
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Category: materials – Page 228
Depending on who you ask and where you are, wearing a mask can be an important part of the strategy to stop the spread of SARS-CoV-2.
With the CDC recommending surgical and N95 masks should be kept for medical personnel on the front line, if you do want or need a mask, you should be purchasing or making a cloth one.
But when looking at cloth masks, which materials work best for keeping your germs in and other people’s germs out?
Former Senate Majority Leader Harry Reid (D-Nev.) praised Monday’s release of the videos, but said more action is needed.
“I’m glad the Pentagon is finally releasing this footage, but it only scratches the surface of research and materials available,” he tweeted. “The U.S. needs to take a serious, scientific look at this and any potential national security implications. The American people deserve to be informed.”
The Pentagon on Monday officially released three videos of “unidentified” flying objects that have been previously leaked to the public.
The Department of Defense authorized the release of the three unclassified videos, including one recorded in November 2004 and two others captured in January 2015. The videos had been distributed in 2007 and 2017, the department noted in a statement.
Officials decided the official release of the videos would not reveal any “sensitive capabilities or systems” and would not impact investigations of unidentified flying objects.
By more accurately printing complex geometric patterns, this new 3D printing method makes construction projects more efficient with less waste and faster time to market.
A new 3D printing method could revolutionize the way additive manufacturing is used to print materials on construction sites.
When black holes swallow down massive amounts of matter from the space around them, they’re not exactly subtle about it. They belch out tremendous flares of X-rays, generated by the material heating to intense temperatures as it’s sucked towards the black hole, so bright we can detect them from Earth.
This is normal black hole behaviour. What isn’t normal is for those X-ray flares to spew forth with clockwork regularity, a puzzling behaviour reported last year from a supermassive black hole at the centre of a galaxy 250 million light-years away. Every nine hours, boom — X-ray flare.
After careful study, astronomer Andrew King of the University of Leicester in the UK believes he has identified the cause — a dead star that’s endured its brush with a black hole, trapped on a nine-hour, elliptical orbit around it. Every close pass, or periastron, the black hole slurps up more of the star’s material.
Researchers at Bilkent University in Turkey have recently created a small quadruped robot called SQuad, which is made of soft structural materials. This unique robot, presented in a paper published in IEEE Robotics and Automation Letters, is more flexible than existing miniature robots and is thus better at climbing or circumventing obstacles in its surroundings.
“We have been working on miniature robots for almost a decade now,” Onur Ozcan, one of the researchers who carried out the study, told TechXplore. “Even though miniature robots have many advantages, such as being cheap, as they require fewer materials, and the ability to access confined spaces, one of their major drawbacks is their lack of locomotion capabilities, especially on uneven terrain.”
Tiny robots tend to get stuck easily while moving in the surrounding environment, as their height does not allow them to climb or avoid obstacles. Ozcan and his colleagues tried to overcome this limitation by implementing a principle known as ‘body compliance.”
Rochester Institute of Technology scientists have developed the first three-dimensional mass estimate to show where microplastic pollution is collecting in Lake Erie. The study examines nine different types of polymers that are believed to account for 75 percent of the world’s plastic waste.
Plastic behaves differently in lakes than in oceans; previous studies on both have indicated the levels of plastic pollution found on the surface are lower than expected based on how much is entering the water. While massive floating “islands” of accumulated plastic waste have been found in oceans, previous studies have indicated the levels of plastic pollution found on the surface of Lake Erie are lower than expected based on how much is entering the water.
The new RIT estimate for the 3D mass—381 metric tons—is more than 50 times greater than the previous estimates at the surface. The study also generated the first estimate of how much plastic is deposited on the bottom of the lake. It accounts for the unique properties of different types of plastics and shows that the three polymers with the lowest density—polyethylene, polypropylene and expanded polystyrene—accumulate on the surface of the lake while the other six polymers were concentrated in the sediment.
As electronic devices become progressively smaller, the technology that powers them needs to get smaller and thinner.
One of the key challenges scientists face in developing this technology is finding materials that can perform well at an ultrathin size. But now, Berkeley researchers think they may have the answer.
Led by Sayeef Salahuddin, professor of electrical engineering and computer sciences, and graduate student Suraj Cheema, a team of researchers has managed to grow onto silicon an ultrathin material that demonstrates a unique electrical property called ferroelectricity. The duo’s findings were published in the April 22 issue of Nature.
Circa 2010
An economical way to make sheets of the blingest material known to man could bring a new era of high-power electronics that don’t need cooling.
