Tag: John Howell

This discovery brings us one step closer to Harry Potter’s invisibility cloak

This discovery brings us one step closer to Harry Potter’s invisibility cloak

September 28, 2014

It’s like a very small invisibility cloak made of glass.

Researchers at the University of Rochester seem to be taking the words of science fiction writer Arthur C. Clarke’s to heart: “any sufficiently advanced technology is indistinguishable from magic.”

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‘Cloaking’ device uses ordinary lenses to hide objects across range of angles

‘Cloaking’ device uses ordinary lenses to hide objects across range of angles

September 25, 2014

Scientists have recently developed several ways—some simple and some involving new technologies—to hide objects from view. The latest effort, developed by physics professor John Howell and graduate student Joseph Choi, not only overcomes some limitations of previous devices, but uses inexpensive, readily available materials in a new way. “This is the first device that we know of that can do three-dimensional, continuously multidirectional cloaking,” said Choi.

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Scientists show you how to make an invisibility cloak (sort of)

Scientists show you how to make an invisibility cloak (sort of)

September 24, 2014

Physicists have figured out the optical parameters for a magic trick they characterize as a kind of “invisibility cloak” — and unlike most magicians, they’re only too willing to show you how it’s done. “We just figured a very simple way of doing that can just be using standard lenses, and things that we normally find in the lab,” physics professor John Howell said in a video explaining the setup.

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Particle measurement sidesteps the Uncertainty Principle

Particle measurement sidesteps the Uncertainty Principle

August 6, 2014

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Particle measurement sidesteps uncertainty principle

Particle measurement sidesteps uncertainty principle

August 6, 2014

Quantum mechanics imposes a limit on what we can know about subatomic particles. If physicists measure a particle’s position, they cannot also measure its momentum, so the theory goes. But a new experiment has managed to circumvent this rule—the so-called uncertainty principle—by ascertaining just a little bit about a particle’s position, thus retaining the ability to measure its momentum, too.

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“Compressive sensing” provides new approach to measuring a quantum system

“Compressive sensing” provides new approach to measuring a quantum system

June 27, 2014

Physicists have shown that a technique called compressive sensing offers a way to measure both variables at the same time, without violating the Uncertainty Principle.

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Professor sings “I Have Failed My Physics Final”

Professor sings “I Have Failed My Physics Final”

January 21, 2014

Physics professor John Howell records a Les Miserables parody to motivate his Physics 121 students to attend workshops.

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How To Hide a Boy – or Maybe a Satellite

How To Hide a Boy – or Maybe a Satellite

June 7, 2013

With the help of his 14 year-old son, Benjamin, John Howell built three simple but surprisingly effective optical cloaking devices with inexpensive, off-the-shelf materials.

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