Tag Archives: DukeUniversity

Metamaterial camera needs no lens, could herald cheaper imaging tech

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http://www.engadget.com/2013/01/18/metamaterial-imaging-sensor/

Metamaterials are proving to be quite useful for toying with the electromagnetic spectrum, whether for technology previously thought to be the stuff of science fiction, or for boring real-world applications. Engineers at Duke University have come up something that falls more into the latter category: a metamaterial imaging sensor that doesn't require a lens to generate a picture. The sensor is a flexible copper-plated sheet patterned with small squares that capture various light frequencies all at once, functioning like one big aperture. Add a few circuits with a pinch of software and the sensor-only camera can produce up to ten images per second, but the catch is Duke's only works at microwave frequencies. Microwave imaging is used plenty, however, and due to its flexibility and lack of moving parts, the sensor could be used to build better integrated, cheaper airport scanners and vehicle collision avoidance technology -- making you safer however you choose to travel. Unless you take the train. Then you're on your own.

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Via: Phys.org

Source: Science, Duke University

Duke University creates ‘perfect’ one-directional microwave cloak, might lead to stealthier vehicles

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Duke University creates 'perfect' onedirectional microwave cloak, might lead to stealthier vehicles

Most attempts at cloaking, no matter the slice of spectrum, usually leave clues as to what's there -- even microwave cloaks can spoil the surprise through reflections. At Duke University, researchers have licked some of those past problems with the first instance of a flawless microwave cloaking scheme. By crafting a special diamond-shaped cloak where the light properties stay consistent at the corners, the school's Nathan Landy and David Smith have successfully shielded a 3-inch wide cylinder from microwave detection without a hint that something was amiss. The gotcha, as hinted by the shape, is a two-dimensional nature that gives away the secret at less than ideal angles. Duke suggests that it still has the groundwork for something that could be vital for communications or radar -- we can imagine a stealth aircraft or ship in the far-flung future that could actively mask itself from radar signals. It's not quite the optical illusion we're looking for, but a refined version of the Duke project might be enough for a rare practical use of cloaking when fantasies are much more common.

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Duke University creates 'perfect' one-directional microwave cloak, might lead to stealthier vehicles originally appeared on Engadget on Mon, 12 Nov 2012 19:09:00 EDT. Please see our terms for use of feeds.

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Alt-week 10.13.12: is the Universe a simulation, cloning dinosaurs and singing mice

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Alt-week peels back the covers on some of the more curious sci-tech stories from the last seven days.

Altweek 101312 is the Universe a simulation, cloning dinosaurs and singing mice

Are you reading this? Seriously, are you? Sure, we know you think you are, but what if you're just a sub-feature of a complex computer program. A sprite, nothing more than the creation of software. The problem with this question is, how would you ever know? You wouldn't, right? Well, not so fast there. Turns out, maybe there is a way to unravel the matrix (if there is one). It'll come as no surprise, that this is one of the topics in this week's collection of alternative stories. Think that's all we got? Not even close. We'll explore the truth behind cloning dinosaurs, as well a rare performance by singing mice -- all before dinner. Or is it really dinner? This is alt-week.

Continue reading Alt-week 10.13.12: is the Universe a simulation, cloning dinosaurs and singing mice

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Alt-week 10.13.12: is the Universe a simulation, cloning dinosaurs and singing mice originally appeared on Engadget on Sat, 13 Oct 2012 17:00:00 EDT. Please see our terms for use of feeds.

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Strobe lighting goggles shown to improve short-term memory, all-night ravers feel validated

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Strobe lighting goggles shown to improve shortterm memory, allnight ravers feel validated

Those goggles you see above aren't for stylish looks while playing dodgeball -- they're the keys to a potentially important discovery about short-term memory. Duke University's Institute for Brain Sciences found that subjects playing catch with goggles simulating strobe lights were noticeably better at memorizing information during tests, even a full day after playtime was over. It's not hard to see why: with a limited amount of time to see that incoming ball, participants had to more vividly remember brief scenes to stay on top of the game. We don't yet know if there's any kind of long-term boost, so don't get your hopes up that strobe lights are the shortcuts to permanent photographic memory. Still, the findings suggest that frequent nightclubbers might be on to something... or, at least, have a better idea of where they left their keys the morning after.

[Image credit: Les Todd, Duke Institute for Brain Sciences]

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Strobe lighting goggles shown to improve short-term memory, all-night ravers feel validated originally appeared on Engadget on Wed, 25 Jul 2012 19:07:00 EDT. Please see our terms for use of feeds.

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Copper-nickel nanowires from Duke University could make ubiquitous printable circuits

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Nanowires

Nanowires, although they're building steam, still have to overcome the not-so-small problem of cost -- they often have to use indium tin oxide that's not just expensive, but fragile. Duke University has developed copper-nanowire films that could remedy this in style. The choice of material is both a hundred times less expensive to make than indium and is much more durable. It's flexible, too: if layered on as a coating, the nanowires would make for considerably more viable wearable electronics that won't snap under heavy stress. The catch, as you might suspect, stems from the copper itself, which doesn't conduct as much electricity as indium. The nickel will keep your copper electronics from oxidizing faster than the Statue of Liberty, however. Any practical use could be years away, but further successes from Duke could quickly see printable electronics hit the mainstream power and power our dreams of flexible displays.

Copper-nickel nanowires from Duke University could make ubiquitous printable circuits originally appeared on Engadget on Thu, 31 May 2012 04:24:00 EDT. Please see our terms for use of feeds.

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