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Researchers demonstrate a method to reduce the energy spread of electrons used in electron microscopes, opening the door to time-and energy-resolved studies of quasiparticles such as phonons and plasmons.

Conceived a century ago, electron microscopes are today standard fare in experimental research laboratories. By imaging a material with electrons, scientists can resolve details 1,000 times smaller than is possible with light. These devices can also employ pulsed electron beams to probe transient phenomena, such as the behavior of quasiparticles that a material hosts. Now Michael Yannai of Technion–Israel Institute of Technology and his colleagues demonstrate a way to improve that capability by reducing the energy spread of the electrons in a pulsed imaging beam [1]. Their method leaves the brightness of the beam unchanged, which is important for ultrafast imaging, as the ultrashort pulses used in this method necessarily comprise small numbers of electrons. “Our technique opens the path to many potential time-and energy-resolved explorations that are currently impossible,” says Ido Kaminer, who headed the team behind the research.

Electron energy spread is one of the key factors limiting an electron microscope’s resolution. The smaller this spread—the closer the beam is to being monochromatic—the better the resolution. The conventional method for reducing energy spread is to filter out electrons with energies outside of the desired range. But that process significantly reduces the electron flux, another factor that can limit a microscope’s performance.

The Crossfire transmitter perturbs the usual functioning on HDZero & Avatar HD FPV Goggles. If you get closer to the goggles’ power cable or goggle, the goggle will shut down or reboot. This video presents two solutions to solve this issue.

00:00 – Video starts.
00:07 – The problem (Crossfire emission power 250 mW)
00:35 – The problem (Crossfire emission power 500 mW)
01:08 – First approach: using a ferrite cable clip.
03:07 – Second approach: using a capacitor as a low-pass filter.
04:27 – Conclusions.

Continue reading “2 methods to solve and improve HDZero & Avatar HD FPV goggles shut down issue when using Crossfire” »

Physicists at the National Ignition Facility are learning how to better control crushingly violent “shots”.

One of the most fascinating implications of Einstein’s famous equation E=mc² is that matter and energy are interchangeable.

PCs are no longer the massive beige boxes that sit on your desk taking up a massive amount of working real estate. Thanks to modernization and miniaturization, PCs can now fit into a tiny box.

How tiny?

Well, a hockey puck is 3 inches in diameter and an inch thick, which is not a lot bigger than the Blackview MP80.

Continue reading “This mini PC is packed with ports and power, and now you can get it for under $150” »

The surprising detection of light 200 times more powerful than previous observations from the nearby pulsar Vela indicates hidden physics around dead stars.

Their advantages extend beyond reducing carbon emissions.

Thirteen US states are now implementing underground thermal energy networks to reduce buildings’ carbon emissions as part of a nationwide push to adopt cleaner energy sources.

Thermal energy networks use pipe loops that connect multiple buildings and provide heating and cooling through water-source heat pumps. Geothermal heat is commonly used in these networks, but it is also possible to bring in waste heat from other buildings through the sewer system.

The latest research on quantum materials and electron curves could revamp our energy-efficient electronics.

As current courses through a battery, its materials erode over time. Mechanical influences such as stress and strain affect this trajectory, although their impacts on battery efficacy and longevity are not fully understood.

A team led by researchers at the Department of Energy’s Oak Ridge National Laboratory developed a framework for designing solid-state batteries, or SSBs, with mechanics in mind. Their paper, published in Science, reviewed how these factors change SSBs during their cycling.

“Our goal is to highlight the importance of mechanics in battery performance,” said Sergiy Kalnaus, a scientist in ORNL’s Multiphysics Modeling and Flows group. “A lot of studies have focused on chemical or electric properties but have neglected to show the underlying mechanics.”