Tag Archives | heat

Magnets Can Influence Heat and Sound

Researchers at The Ohio State University have discovered how to control heat with a magnetic field. An experiment proved that the phonon--the elementary particle that carries heat and sound--has magnetic properties. This artist's rendering, based on computer simulations, depicts a phonon heating solid material. Atoms of the material, shown in orange, are joined with flexible atomic bonds, shown as springs. The phonon imparts heat by colliding with the center atom, creating a vibration in the springs. The trail of the passing phonon is marked with increased magnetic field intensity, shown in green. The figure in the lower right shows the direction of the applied magnetic field. The researchers found that a sufficiently strong magnetic field can cause phonons to collide with each other and be deflected off-course, which slows the flow of heat through the material. Credit: Image by Renee Ripley, courtesy of The Ohio State University.

Researchers at The Ohio State University have discovered how to control heat with a magnetic field. 
Credit: Image by Renee Ripley, courtesy of The Ohio State University.

I think my stereo’s speakers proved that last one, but anyway, via ScienceDaily:

Researchers at The Ohio State University have discovered how to control heat with a magnetic field.

In the March 23 issue of the journal Nature Materials, they describe how a magnetic field roughly the size of a medical MRI reduced the amount of heat flowing through a semiconductor by 12 percent.

The study is the first ever to prove that acoustic phonons — the elemental particles that transmit both heat and sound — have magnetic properties.

“This adds a new dimension to our understanding of acoustic waves,” said Joseph Heremans, Ohio Eminent Scholar in Nanotechnology and professor of mechanical engineering at Ohio State. “We’ve shown that we can steer heat magnetically.

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Heat Wave Due To “Exceptionally Strong” Air Mass

Photos: Alex E. Proimos

Photos: Alex E. Proimos

Today has been the coolest day all week in the Northeast of the US.  The Midwest, Northeast and Southern parts of the country have been experiencing consecutive days of high temperatures and humidity which have contributed to many deaths throughout the country. What is the cause of this cantankerous heat and is it an indication of future affects of global warming? The National Geographic reports:

A stubborn high-pressure system is the culprit behind the dangerously high heat wave that’s been baking much of the U.S., experts say.

The high-pressure system—a large area of dense air—is being held in place by upper-level winds known as the jet stream. Within the system, dense air sinks and becomes warmer, and since warm air can hold more moisture than cooler air, there’s also very high humidity. (Learn more about Earth’s atmosphere.)

Stationary high-pressure systems aren’t unusual during the summer, according to Eli Jacks, a meteorologist at the National Weather Service headquarters in Silver Spring, Maryland.

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