4 years ago
Exploring the boundaries of turbulence wins honors for Caltech researcher

An Air Force Office of Scientific Research-funded researcher is exploring the physics of turbulence, including the potential impact of turbulence on flows, which are of interest to the Air Force. The researcher, Dr. Beverley J. McKeon of California Institute of Technology is using both new and traditional diagnostic materials to produce simplified models of conditions that produce turbulen...

5 years ago
Michigan Tech scientist models molecular switch

HOUGHTON, Mich.--Michigan Technological University physicist Ranjit Pati and his team have developed a model to explain the mechanism behind computing's elusive Holy Grail, the single molecular switch. If born out experimentally, his work could help explode Moore's Law and could revolutionize computing technology. Moore's Law predicts that the number of transistors that can be e...

7 years ago
Scientists catch electrons tunnelling out of atoms

London, April 6 (Xinhua) Scientists have for the first time measured electrons tunnelling their way out of atoms at an amazing speed of less than a billionth of a millionth of a second, according to the latest issue of Nature. Electrons have a negative charge and are glued into atoms by the attractive force of its positively charged nucleus. In classical physics, an electron could not escap...

7 years ago
Quantum effects make the difference

Until now, it has been assumed that the properties of a transition of this nature can be described completely with the fluctuations of one parameter, in this case, magnetic order. However, the experiments that have now been published reveal, completely unexpectedly, an additional change to the electronic properties of the transition. It confirms again that quantum effects can result in phenomena t...

7 years ago
The Genesis of Relativity

New insights into the premises, assumptions and preconditions that underlie Einsteinís Relativity Theory, as well as the intellectual, and cultural contexts that shaped it, are the subject of a comprehensive study published this month by Springer. The publication of The Genesis of General Relativity1 marks the outcome of 10 years of research into the origins of Einsteinís General Relativit...

7 years ago
Steering atoms toward better navigation, physicists test Newton and Einstein along the way

Stanford physicist Mark Kasevich has adapted the technology in today's airplane navigation systems to work with atoms so cold that they almost stand still. At temperatures scarcely above absolute zero, atoms no longer behave as particles but rather as de Broglie waves, named for the theorist who originally posited that all matter behaves as both a light wave and as a particle. These waves can be c...

7 years ago
Quantum biology -- Powerful computer models reveal key biological mechanism

Troy, N.Y. -- Using powerful computers to model the intricate dance of atoms and molecules, researchers at Rensselaer Polytechnic Institute have revealed the mechanism behind an important biological reaction. In collaboration with scientists from the Wadsworth Center of the New York State Department of Health, the team is working to harness the reaction to develop a nanoswitch for a variety of app...

7 years ago
What do Racquel Welch and quantum physics have in common?

The study aims to delve into a 'void' or empty space in which atoms move, which has a large intrinsic energy density known as zero-point energy Recent investment by the University of Leicester in the Virtual Microscopy Centre and the Nanoscale Interfaces Centre has put the University in a key position to take a lead in Casimir force measurements in novel geometries. The Casimir for...

8 years ago
Electrons 'in limbo' seen for first time

In the first paper, Petek and Miroslav Nyvlt of Charles University in Prague explored the properties of metals under intense light--a situation where the classical physics of electron emission from metals emerges from its quantum roots, says Petek. They found that when light of a certain energy and intensity is shone onto a metal surface, a few electrons in the metal become stuck on the surface (t...

8 years ago
Earth's turbulence stirs things up slower than expected

In a simple world rivers would flow in straight lines, every airplane ride would be smooth, and we would know the daily weather 10 years into the future. But the world is not simple -- it is turbulent. That's good news, since turbulence helps drive natural processes essential for life. Unfortunately it also means we are never 100 percent sure it won't rain on Saturday. Turbulence ...

8 years ago
Breakthrough computer chip lithography method developed at RIT

A new computer chip lithography method under development at Rochester Institute of Technology has led to imaging capabilities beyond that previously thought possible. Leading a team of engineering students, Bruce Smith, RIT professor of microelectronic engineering and director of the Center for Nanolithography Research in the Kate Gleason College of Engineering, developed a method--...

8 years ago
Turbulence yields secrets to 73-year-old experiment

Turbulence is the jittery, swirling behavior of a gas or liquid when flowing next to a wall or around an obstacle, said Gustavo Gioia, a professor of theoretical and applied mechanics at Illinois. Although most of the flows that surround us in everyday life are turbulent flows over rough walls, these flows have remained one of the least understood phenomena of classical physics. In 1933, Jo...

8 years ago
A theoretical breakthrough inspired by experiment

When a hydrogen molecule, H2, is hit by a photon with enough energy to send both its electrons flying, the two protons left behind the hydrogen nuclei -- repel each other in a so-called Coulomb explosion. In this event, called the double photoionization of H2, the paths taken by the fleeing electrons have much to say about how close together the two nuclei were at the moment the photon struck, ...

10 years ago
Quantum computers are a quantum leap closer, say Purdue physicists

WEST LAFAYETTE, Ind. - A new breed of faster, more powerful computers based on quantum mechanics may be a step closer to reality, report scientists from Purdue and Duke universities. By linking a pair of tiny puddles of a few dozen electrons sandwiched inside a semiconductor, researchers have enabled these two so-called quantum dots to become parts of a transistor - the vital switch...

10 years ago
Connecting the quantum and classical physics

Miles Blencowe, a quantum theorist with the Physics and Astronomy Department at Dartmouth, wrote the article Nanomechanical Quantum Limits for the Perspectives section of the April 2 issue of Science. In it, he explains the problem of reconciling the inherent contradiction between the quantum or atomic world and the macroscopic word of trees, buildings and cars that we live in. The world we...

10 years ago
Brittle fracture mechanism breaks the sound barrier

Materials scientists discover the conditions under which cracks can propagate supersonically in brittle solids. Glass breaks, rubber bursts--there are numerous ways in which materials can fail under extreme conditions. Many of the atomic mechanisms of materials failure however still remain a mystery. Some materials harden when they are stretched, others soften under large deformatio...

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