Physicists
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'Unprecedented' 3D magnetic interactions could change computing
The field of spintronics, or spin electronics, uses an electron's spin and its magnetic movement to encode instructions and other data. It's sometimes seen as an alternative to electronics, which relies on the electron's charge to encode data. While spintronics has the potential to increase data processing speeds, boost storage capacity and offer increased data resilience, it's been limited because physicists could only move the electrons -- or tiny magnetic particles -- around a single atomic layer. Now, researchers have found a way to move information from magnets in one layer to magnets in another. They hope the discovery will lead to new possibilities for data storage and computing.
Christine Fisher06.03.2019
Duke University's underwater invisibility cloak stills troubled waters
Everyone's jumping on the invisibility cloaking bandwagon these days, but no one's quite managed to fully deliver on the promise. The same goes for two Duke University researchers who believe their mesh casing could grant the gift of concealment to underwater craft -- submarines, anyone? According to the proposed model, a specially designed shell punctuated by complex patterns of permeability and millimeter-sized pumps would eliminate the drag and turbulent wake caused by an object as it moves through the water. Utilizing the penetrable gaps in the case, water would at first accelerate, and then decelerate to its original speed before exiting -- rendering the fluid around the object virtually undisturbed. Now for the bad news: the design doesn't quite work for large-scale, real-world implementations -- hello again, submarines -- since the tech can only cloak small structures, like "a vehicle one centimetre across... [moving] at speeds of less than one centimetre per second." It's a massive bummer, we know, but we're getting there folks -- you just won't see it when it actually happens.
Joseph Volpe07.29.2011
Duke University physicists test first air-based acoustic invisibility cloak
Firmly departing from the Stuff Of Dreams category, Duke University physicists have successfully tested an acoustic cloaking device that fools sound waves while looking nowhere near as scifi as you'd think. Layering nothing more than a bunch of hole-punched plastic sheets -- known as meta-materials, for those curious -- atop a ten centimeter long block of wood, highly-directed sound in the 1 - 4kHz range bounced right off the concealed object none the wiser. The cloaking tech owes some of its origin to the math behind transformation optics -- and maybe to the Duke team, too. Besides allowing defense department bunkers to erupt into silent applause, the research should prove useful in the construction of future concert halls. DIY hobbyists, let us know what you can rig up with some trash bags. [Thanks, Drew]
Joseph Volpe06.25.2011
Physicist fight: how heavy is a kilogram?
Physicists are currently hotly debating a topic some of us never think about -- or if we did -- surely we'd think 'there's an answer for that, even if I don't know what it is.' The question? The question at hand is 'how heavy is a kilogram?' The currently accepted answer is the mass of a cylinder of platinum and iridium called the International Prototype Kilogram. The problem with that definition, of course, is that not just anybody can measure it -- since most of us don't have an International Prototype Kilogram laying around, especially since every time the thing is picked up a few atoms rub off of it making it a little bit lighter. Because of this, the actual International Prototype Kilogram (yes, there does only seem to be one in existence) is stored in a vault in Sevres, France, limiting the lay person's ability to determine the actual weight of a kilogram. There are other options on the table, of course, including one involving a two-stories high piece of equipment that costs around $1.5 million -- which isn't much better, when you think of it. Enter Ronald Fox and friends over at the National Institute of Standards and Technology. They're suggesting a rather shocking solution: make the kilogram equal to the mass of a certain number of carbon-12 atoms (2250× 28148963^3 of them), also known as a cube of carbon measuring 8.11 centimeters on each side. This would mean, of course, that pretty much anybody could determine the weight of a kilogram at home. But we wouldn't want that, now, would we?
Laura June Dziuban06.06.2010
Spintronics magic appears again, aims to vastly accelerate data storage and retrieval
As the list of "awesome things that won't ever happen" grows ever longer, we've got a brilliant team of French physicists who have seemingly concocted a method for storing and retrieving data on hard discs that's around 100,000 times faster than usual. Yes, 100,000x. The trick is based around spintronics, an almost mythical procedure that involves the use of lasers, magnetic sensors and mutant abilities to shuffle data around at a dizzying rate. This particular method, however, improves upon the comparatively sluggish attempts of the past, as it uses photons that "modify the state of the electrons' magnetization on the storage surface." In layman's terms, this all means that the HDD you buy in 2098 will probably operate significantly faster than the one you picked up during Circuit City's going-out-of-business sale. Got it? Good.
Darren Murph06.07.2009
Quantum cryptography: now ready for space travel
It's been awhile since we've heard of any major advancements in the world of quantum cryptography, but at long last the silence is being broken by a squad of jubilant Austrian physicists. As the story goes, a team from Austria's Institute for Quantum Optics and Quantum Information (IQOQI) managed to send "entangled photons" 90 miles between the Spanish islands of Las Palmas and the Balearics. Calling the ephemeral test successful, the crew has boldly asserted that it's now feasible to send "this kind of unbreakable encrypted communication through space using satellites." Funny -- last we remember, quantum cryptography still had a few kinks to work through here beneath the stratosphere.
Darren Murph05.04.2009
Scientists figure out how to momentarily store images in vapor
You don't have to be a science buff to understand that atoms in gases move around a heck of a lot more than those in solids. For instance, text on a paper page isn't apt to just reshuffle itself when no one is looking, but printing the latest Harry Potter novel on thin air could prove just a touch more difficult. Said challenge isn't too much for physicists from varying institutions in Israel, as they have recently demonstrated how to ever-so-briefly store images in a warm atomic vapor. Reportedly, the gurus have figured out how to "store complex images for up to 30 microseconds in rubidium vapor," and if mastered, the process could help unlock secrets of "quantum information processing and even quantum communication." If your interest meter just shot through the roof (you geek, you), head on down to the read link to slurp up more on how it's being done.
Darren Murph06.24.2008
German scientists claim to have broken speed of light
We're almost terrified to hear what the physicists in the crowd have to say about this one, but a duo of German scientists have reportedly broken the speed of light. To do so, the two "set up an experiment in which microwave photons, energetic packets of light, appeared to travel instantaneously between two prisms forming the halves of a cube placed a meter apart." According to them, they were able to force light to overcome its own speed limit by utilizing a "strange phenomenon known as quantum tunneling." Dr. Gunter Nimtz was even quoted as saying that for the time being, it was the "only violation of special relativity that he knew of," and while it does indeed sound (way) too good to be true, we'll step aside and let the experts battle it out.[Via Telegraph, thanks Ian]UPDATE: As predicted, there's a high probability that these claims aren't exactly, shall we say, infallibly correct -- but at least someone's giving it a go, eh?
Darren Murph08.16.2007
Australian physicists develop teleportation scheme for atoms
Although the idea of teleporting individuals from one place to another in order to sidestep the headache of rush hour traffic has been around for quite some time, a team of Australian physicists are busy making it work (on a smaller scale, of course). Granted, they don't fully expect their teleportation scheme to be used on humans in the near future, but there's always hope, right? Anyway, the team has developed a so-called "simple way to transport atoms," which involves bringing the atoms to almost absolute zero, beaming them with two lasers, and using fiber optics to transport them to any other place at the speed of light where they "enter a second condensate" and reconstruct. We'll keep you posted on when human trialing (hopefully) begins.
Darren Murph07.11.2007
Heat-sensitive paper could lead to 3D printers
When you've already got self-assembling robots and Li-ion batteries, you might as well tackle 3D printouts next, right? Apparently that's the mantra being used by physicists in Israel who have purportedly invented a monomer solution that, when heated over 33 degrees Celsius, would bend and form into the object depicted, theoretically turning a flat, 2D photo into a three-dimensional rendition. Eran Sharon and colleagues from the Hebrew University of Jerusalem applied N-isopropylacrylamide to the surface of a prototype "disc," and "created a range of structures varying in complexity, from slightly wavy crisp-like objects to those that look like a sombrero." Interestingly, a scientist not directly involved with the study commented that the discovery could actually be used to craft printers that could pop out 3D printouts when heat was added, which would surely keep kids occupied (and your ink cartridges bone dry) for weeks on end. As expected, there weren't many details hinting that this novel idea would be headed for the commercial realm anytime soon, but considering all the other 3D paraphernalia already out, we can't imagine this taking too long to follow suit.[Via Slashdot]
Darren Murph02.25.2007