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23 results for Physics

Electrons Can Form Solid Orderly Structure
Electrons Can Form Solid Orderly Structure

https://weizmann-usa.org/news-media/in-the-news/electrons-can-form-solid-orderly-structure/

Nov 21, 2019... (l-r) Ilanit Shapir and Prof. Shahal Ilani answered an 80-year-old question
JERUSALEM, Nov. 21 (Xinhua) — Israeli scientists have shown that electrons can form, like atoms, an organized structure to form a solid inside a solid, the Weizmann Institute of Science (WIS) reported Thursday.
In a study published in the journal Science, the WIS researchers image such electron solid showing electrons arranged in a row on a nanowire, like birds on wire.

TAGS: Physics, Quantum theory

‘Rock-Breathing’ Bacteria are Electron Spin Doctors, Study Shows
‘Rock-Breathing’ Bacteria are Electron Spin Doctors, Study Shows

https://weizmann-usa.org/news-media/in-the-news/rock-breathing-bacteria-are-electron-spin-doctors-study-shows/

Mar 09, 2020... Electrons spin. It's a fundamental part of their existence. Some spin “up”  while others spin “down.”  Scientists have known this for about a century, thanks to quantum physics.
They've also known that magnetic fields can affect the direction of an electron’s quantum spin, flipping it from up to down and vice versa. And it doesn't take much: Even a bacterial cell can do it.
Researchers at USC Dornsife College of Letters, Arts and Sciences and Israel's Weizmann Institute of Science have found that protein “wires”  connecting a bacterial cell to a solid surface tend to transmit electrons with a particular spin.

TAGS: Technology, Physics, Bacteria, Quantum theory

Scientists Discover How to Use Time Crystals to Power Superconductors
Scientists Discover How to Use Time Crystals to Power Superconductors

https://weizmann-usa.org/news-media/in-the-news/scientists-discover-how-to-use-time-crystals-to-power-superconductors/

Mar 02, 2020... The concept of time crystals comes from the realm of counterintuitive mind-melding physics ideas that may actually turn out to have real-world applications. Now comes news that a paper proposes merging time crystals with topological superconductors for applications in error-free quantum computing, extremely precise timekeeping and more.
Time crystals were first proposed as hypothetical structures by the Nobel-Prize winning theoretical physicist Frank Wilczek and MIT physicists in 2012. The remarkable feature of time crystals is that they would would move without using energy. As such they would appear to break the fundamental physics law of time-translation symmetry. They would move while staying in their ground states, when they are at their lowest energy, appearing to be in a kind of perpetual motion. Wilczek offered mathematical proof that showed how atoms of crystallizing matter could regularly form repeating lattices in time, while not consuming or producing any energy.

TAGS: Physics, Quantum theory, Computers

The Fastest Way to Heat Certain Materials May be to Cool Them First
The Fastest Way to Heat Certain Materials May be to Cool Them First

https://weizmann-usa.org/news-media/in-the-news/the-fastest-way-to-heat-certain-materials-may-be-to-cool-them-first/

Mar 02, 2020... To heat a slice of pizza, you probably wouldn’t consider first chilling it in the fridge. But a theoretical study suggests that cooling, as a first step before heating, may be the fastest way to warm up certain materials. In fact, such precooling could lead sometimes to exponentially faster heating, two physicists calculate in a study accepted in Physical Review Letters.
The concept is similar to the Mpemba effect, the counterintuitive — and controversial — observation that hot water sometimes freezes faster than cold water (SN: 1/6/17). Scientists still don’t agree on why the Mpemba effect occurs, and it’s difficult to reproduce the effect consistently. The new study is “a way of thinking of effects like the Mpemba effect from a different perspective,” says physicist Andrés Santos of Universidad de Extremadura in Badajoz, Spain, who was not involved with the research.

TAGS: Physics, Materials, Quantum theory

Israeli-led Research Team Reveals Detailed 3D Structure of Atom
Israeli-led Research Team Reveals Detailed 3D Structure of Atom

https://weizmann-usa.org/news-media/in-the-news/israeli-led-research-team-reveals-detailed-3d-structure-of-atom/

Feb 25, 2020... Israeli researchers and their European partners for the first time provided a detailed three-dimensional (3D) image of electron trajectories around a molecule, the Weizmann Institute of Science (WIS) in central Israel reported Friday.
The conventional image of an atom resembles a simple system of sun and planets, namely a small positively-charged nucleus, and negative-charged electrons orbiting it in circular or elliptical paths.

TAGS: Physics

‘We Don’t Know What 85 Percent of the Universe Is Made Of. Something Doesn’t Add Up’
‘We Don’t Know What 85 Percent of the Universe Is Made Of. Something Doesn’t Add Up’

https://weizmann-usa.org/news-media/in-the-news/we-don-t-know-what-85-percent-of-the-universe-is-made-of-something-doesn-t-add-up/

Aug 01, 2019... What is your field of study?
I did my doctorate in high-energy physics – particle physics – and my research is on astroparticles.
Could you explain to laypeople what that means?
As we all learned in high school, we are made of molecules, atoms, protons, neutrons and electrons. But we can actually go down to a more precise resolution because the protons and neutrons are composed of smaller particles, called quarks. And there are also a great many more particles that are created at very high energies. With particle accelerators – if they are particle accelerators such as the sun, gamma-ray bursts and supernovas –

TAGS: Space, Women, Physics, Quantum theory

The Quantum Computer Is About to Change the World. Three Israelis Are Leading the Revolution
The Quantum Computer Is About to Change the World. Three Israelis Are Leading the Revolution

https://weizmann-usa.org/news-media/in-the-news/the-quantum-computer-is-about-to-change-the-world-three-israelis-are-leading-the-revolution/

Feb 24, 2020... In October 2019, Google announced that its quantum computer, Sycamore, had done a calculation in three minutes and 20 seconds that would have taken the world’s fastest supercomputer 10,000 years. “Quantum supremacy,” Google claimed for itself. We now have a quantum computer, it was saying, capable of performing calculations that no regular, “classical” computer is capable of doing in a reasonable time.

TAGS: Physics, Quantum theory, Computers

Physics on the Edge – Dr. Efi Efrati
Physics on the Edge – Dr. Efi Efrati

https://weizmann-usa.org/news-media/video-gallery/physics-on-the-edge-dr-efi-efrati/

Jul 03, 2019... Meet Dr. Efi Efrati, a member of the Department of Physics of Complex Systems. Dr. Efrati speaks about his research on “geometric frustration,” a physical state that could help us understand a host of phenomena—from the behavior of plastics to how living tissue remodels itself. His work may lead to the design of new materials, improved surgical procedures, and more. Find out why Dr. Efrati believes the Weizmann Institute is “the best place to do science in Israel … perhaps in the world.”

TAGS: Biology, Physics, Materials

Laser Centrifuge Spins out Chiral Molecules in World First
Laser Centrifuge Spins out Chiral Molecules in World First

https://weizmann-usa.org/news-media/in-the-news/laser-centrifuge-spins-out-chiral-molecules-in-world-first/

Jun 20, 2019... ‘This is the first time anyone has been able to control the spatial orientation of chiral molecules with light,’ says Ilya Averbukh from the Weizmann Institute of Science in Israel. His theory group teamed up with Valery Milner’s experimental team from the University of British Columbia, Canada, to build a laser setup called an optical centrifuge that can spin chiral molecules depending on their handedness.

TAGS: Physics, Optics, Quantum theory

Brain Power in Numbers: Ants Use Collective Cognition to Navigate Obstacles
Brain Power in Numbers: Ants Use Collective Cognition to Navigate Obstacles

https://weizmann-usa.org/news-media/in-the-news/brain-power-in-numbers-ants-use-collective-cognition-to-navigate-obstacles/

May 12, 2020... For a single ant, the world can be an overwhelmingly big place. To safely navigate their environs, ants rely on collective cognition.
According to a new study, published Tuesday in the journal eLife, collective brainpower makes seemingly chaotic environs navigable.
“Cooperation is a common means by which animals can increase their cognitive capacity, and we were intrigued as to whether this cooperation allows ants to extend the range of environments in which they can efficiently collect food,” first study author Aviram Gelblum, a postdoctoral fellow at the Weizmann Institute of Science in Israel, said in a news release.

TAGS: Neuroscience, Physics, Evolution, Senses

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