Physics

Helmet-to-helmet collisions: Scientists model how vibrations from football hits wobble the brain

It's fall football season, when fight songs and shouted play calls fill stadiums across the country. Another less rousing sound sometimes accompanies football games: the sharp crack of helmet-to-helmet collisions. Hard collisions can lead to player concussions, but the physics of how the impact of a helmet hit transfers to the brain are not well understood. A research team from the U.S. Naval Academy in Annapolis, Md., has created a simplified experimental model of the brain and skull inside a helmet during a helmet-to-helmet collision.

Taking the bite out of baseball bats

Miss hitting the "sweet spot" on a baseball bat and the resulting vibrations can zing your hands. Bat companies have tried for decades to reduce these painful shocks with limited success. But Daniel Russell, a professor in the graduate program in acoustics at Pennsylvania State University in University Park, has figured out that bat vibrations between 600 and 700 hertz (Hz) cause the most pain and that specifically tuned vibration absorbers are the best at combatting the sting.

Scientists study how mid-level noise burstsmaffect the concentration of arithmetic-solving test subjects

Noise can be distracting, especially to a person trying to concentrate on a difficult task. Studying annoying noises helps architects design better building environments and policy makers choose effective noise regulations. To better understand how short noise bursts affect humans' mental state, researchers from the University of Nebraska – Lincoln played quarter-second-long white noise clips to test subjects as they worked on arithmetic problems.

NASA pursues atom optics to detect the imperceptible

(Phys.org)—A pioneering technology capable of atomic-level precision is now being developed to detect what so far has remained imperceptible: gravitational waves or ripples in space-time caused by cataclysmic events including even the Big Bang itself.

NASA pursues atom optics to detect the imperceptible

A pioneering technology capable of atomic-level precision is now being developed to detect what so far has remained imperceptible: gravitational waves or ripples in space-time caused by cataclysmic events including even the Big Bang itself.<img src="http://feeds.feedburner.com/~r/sciencedaily/matter_energy/physics/~4/ISY... height="1" width="1"/>

Optical vortices on a chip: Integrated arrays of emitters of 'optical vortex beams' on a silicon chip

Researchers have demonstrated integrated arrays of emitters of 'optical vortex beams' on a silicon chip. Contradicting traditional conception, light in such beams does not propagate in straight rays. Instead, its energy travels in a spiral fashion in a hollow conical beam shape. The beams therefore look very much like a vortex or cyclone, with its light rays 'twisted' either left-handed or right-handed.

One million UK jobs depend on physics, report reveals

A new report from the Institute of Physics (IOP) shows that 4% of employees in the UK work in companies that would not exist without the physics base, or without employees that have an advanced understanding of physics.

Feynman on Initial Conditions, Evolving Laws, and What We Consider Physics | Cosmic Variance

<p>We&#8217;ve mentioned before that Richard Feynman was way ahead of his time when it came to the need to understand <a rel="nofollow" target="_blank" href="http://blogs.discovermagazine.com/cosmicvariance/2008/12/29/richard-feyn... initial conditions and the low entropy of the early universe</a>.

Study confirms magnetic properties of silicon nano-ribbons

Nano-ribbons of silicon configured so the atoms resemble chicken wire could hold the key to ultrahigh density data storage and information processing systems of the future, according to new research.<img src="http://feeds.feedburner.com/~r/sciencedaily/matter_energy/physics/~4/Yqa... height="1" width="1"/>

Method uses cosmic rays to gather detailed information from inside damaged Fukushima nuclear reactors

(Phys.org)—Researchers from Los Alamos National Laboratory have devised a method to use cosmic rays to gather detailed information from inside the damaged cores of the Fukushima Daiichi nuclear reactors, which were heavily damaged in March 2011 by a tsunami that followed a great earthquake.

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