Tag Archives: innovation

MIT students develop wearable cooling device that could make air conditioning obsolete

MIT students develop wearable cooling device that could make air conditioning obsolete

By Drew Prindle

Published November 03, 2013

Digital Trends
  • wristify-mit
    MIT

We come across quite a lot of cool technology, but it’s not every day that we find something that can literally cool you down.

Developed by four engineering students at MIT, Wristify is a prototype wearable device that leverages the physical phenomenon known as the Peltier effect to reduce your body temperature.

The Peltier effect, named for French physicist Jean Charles Athanase Peltier who discovered it in 1834, describes the phenomenon of heating or cooling caused by an electric current flowing across the junction of two different conductors. As the current moves from one conductor to another, the transfer of energy causes one side to heat up and the other to cool down.

Wristify is basically a series of these junctions (called a Peltier cooler) powered by a small battery and attached to a wrist strap. When placed against the skin, the device makes you feel cooler by reducing the temperature of your wrist a few fractions of a degree per second for a couple seconds at a time. Over the course of a few minutes, this process will cause you to perceive a whole-body cooling of a couple degrees Celsius.

The team developing the device is still tinkering with it to figure out the optimal cooling cycle, but at this point in time they say the most effective method is to cool your wrist by 0.4 degrees Celsius (0.7F) per second for five seconds, and then turn off for 10 seconds.

The chief benefit of this device is that it offers a more personalized approach to temperature control, one that’s vastly more efficient than current heating and cooling methods. It takes millions of watts to raise or lower the temperature of an entire building, but Wristify can run on a small lithium battery. If everybody had one of these things on their wrist instead of relying on air conditioning or heaters all the time, the potential energy savings could be massive.

Of course, it’s still just a prototype, but the idea recently won the $10,000 top prize in MIT’s annual Making And Designing Materials Engineering Competition, and the team plans to put all that cheddar toward further development of the device.

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Tongue-controlled wheelchairs

Tongue-controlled wheelchairs prove effective for quadriplegic patients

By Loren Grush

Published November 27, 2013

FoxNews.com
  • Tongue Drive System 1.jpg

    Jason DiSanto receives a tongue implant to test the Tongue Drive System. (GARY MEEK)

  • Tongue Drive System 2.jpg

    Jason DiSanto tests out the Tongue Drive System (GARY MEEK)

  • Jason DiSanto.jpg

    Jason DiSanto poses with the sip-and-puff-system (GARY MEEK)

For patients who no longer have the use of their limbs and torso, life must be navigated through a powered wheelchair – which users often control by blowing into a plastic straw to execute basic functions.

But now, a novel technology may soon allow patients with quadriplegia to better control their wheelchairs by utilizing a surprising new body part: the tongue.

Called the Tongue Drive System, the method involves implanting a magnetic stud into patients’ tongues, allowing them to use the muscle as a joystick for their wheelchairs. Sensors in the stud relay the tongue’s position to a headset placed on the patient’s head, which communicates one of six basic functions for the wheelchair to perform.

The system allows users to not only control their wheelchair, but also surf a computer, use a cellphone, turn on a television and much more.

“One of the main advantages of the tongue is that it is directly connected to the brain through cranial nerves, as opposed to the rest of the body,” Maysam Ghovanloo, an associate professor in the school of electrical and computer engineering at Georgia State Institute of Technology and the creator of the system, told FoxNews.com. “Everything from the neck down is controlled through the spinal cord, so if the spinal cord is damaged, everything below that level becomes paralyzed… But even people with the highest level of spinal cord injury, they maintain their tongue motion.”

Currently, the conventional method used by quadriplegic patients for wheelchair control is the sip-and-puff system.  Through a plastic tube mounted on the wheelchair, users either sip or puff air to dictate what they want the chair to do.  However, the sip-and-puff system can only execute four basic commands, and many patients feel it can be cumbersome and awkward.

“The problem with the sip-and-puff system – even though it’s low cost and easy to use – it’s very slow.  It works like a Morse code; you have to enter these commands in a series,” Ghovanloo said.  “…It’s also mounted on the wheelchair, so when a patient is transferred from wheelchair to wheelchair or from wheelchair to bed, it needs to be transferred with them, or they need another one set up there.

To showcase the benefits of the Tongue Drive System, Ghovanloo has teamed up with scientists from the Shepherd Center in Atlanta and the Rehabilitation Center Institute in Chicago, in order to test the technology on quadriplegic patients at the rehabilitation center.  In earlier clinical trials, the researchers tested a removable version of the magnetic stud, which was attached to the tongue through an adhesive.  However, the adhesive was only temporary and had to be reapplied every one to two hours.

But in the most recent trial, published Nov. 27 in the journal Science Translational Medicine, researchers experimented with a more permanent option, by implanting the magnetic stud through a piercing in the tongue.

“It was the first time a tongue piercing had been performed as a medical procedure,” Joy Bruce, manager of Shepherd Center’s Spinal Cord Injury Lab and co-author of the study, told FoxNews.com.  “A lot of extra care was given to the procedure, but what we discovered is that the tongue piercing risks for this population is the same for the general population.”

Jason DiSanto was the first of 11 quadrapleigic patients to get his tongue pierced in order to test the new technology.  DiSanto has worked at the Shepherd Center since 2009, after a diving accident left him paralyzed from the neck down. He said that he is excited about Ghovanloo’s system, as his current system can be difficult to manage.

“My biggest thing is that the current system I’m using is quite limited in functionality, and also it takes a while to get used to the commands, so there’s a big learning curve,” DiSanto told FoxNews.com.  “Whereas the Tongue Drive System does not have such a huge learning curve; it’s quite intuitive. It’s also more functional than my current system.”

The research team had the subjects perform a set of tasks in a controlled hospital environment, including driving a wheelchair through a course, moving a cursor on a computer screen, operating a cellphone and more.  A control group of able-bodied study participants also had the tongue stud implanted and were required to perform the tests as well.

The experiments were repeated over five weeks for the control group and over six weeks for the quadriplegic group.  For the first time, the researchers showed that the patients with quadriplegia could maneuver their chairs much more easily and much faster with the Tongue Drive System than with the sip-and-puff system.

“As a matter of fact, [the patients] were a little upset that they could not use the system after the end of the trial,” Ghovanloo said. “…I know at least two of them have still kept their tongue ring… so they can receive the device as soon as it’s available.  We did a questionnaire at the end of the trail, and their responses were almost unanimously positive.”

While the Tongue Drive System still requires regulatory approval, Ghovanloo has created a startup company called Bionic Sciences in order to move the technology forward.  He has also teamed up with DiSanto, who has worked as an electrical engineer for 17 years, to develop a more internal tongue control system – one that replaces the outside headgear with a sensor-filled retainer that can fit inside the mouth.

DiSanto said he is excited for the future of this technology, hoping that one day he can utilize it outside of the hospital and incorporate it into his daily routine.

“Having one system that can perform multiple functions will be a huge boost of confidence,” DiSanto said. “It will help us feel more like ourselves before we were injured.”

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Human Regenerator That Controls Aging

German Company Develops Human Regenerator That Controls Aging
Anti-Aging Human Regenerator Pod

Scientists have struggled for a very long time to get a hold of this thing we all go through which is aging. Medicine and hygiene have added about 20-30 years to the average lifespan since a couple hundred years ago, but we want more life it seems. While some scientists focus on the human building blocks (our DNA) others are focusing on healing our body. A German company recently announced a new product called Human Regenerator that can control aging.

The company, System 4 Technologies Gmbh recently showcased their “pod” at the World Luxury Expo held at the Abu Dhabi’s Emirate palace. This Human Generator looks like something out of a science fiction movie, and its purpose is somewhat like it too. By utilizing a unique technology by the name of Quantum Cell Code, humans are apparently able to control aging. However, don’t be fooled, you can’t stop aging altogether, but it is said that the apparatus can rejuvenate the cells in your body and at least slow it down.

So what is this thing and how does it accomplish this almost holy grail-like miracle? Well, I will try to explain it to the extent that I understand it myself. The developers have used silicon and aluminum deposits which supposedly help create the anti-aging effect. The Human Regenerator imitates the body’s natural frequencies through quantum cell technology and longitudinal waves. Don’t ask me how but that’s as much as I understand.

Don’t expect this gadget to be cheap either. Unfortunately, it’s not for everyone. The basic modelwill have a price tag of $557,000 and only 50 units will be created. The one used at the Abu Dhabi expo was a promotional unit that had been pimped out with 6880 carats worth of diamonds, which sets the price tag for this particular unit at around $10 million. I guess if you want everlasting youth you will have to bust out the big wallet. Eternal youth is apparently not for the less fortunate ones, but we already knew this from the silver screen, didn’t we? – More information at Human Regenerator.

System 4 Technologies’ Human Regenerator

Anti-Aging Human Regenerator

Anti-Aging Human Regenerator

Author: Richard Darell

Richard Darell is the founder and CEO of Bit Rebels, a multifaceted online news outlet that reports daily on the latest developments in technology, social media, design and everything geek. Today this media entity welcomes more than 2.5 million unique visitors per month and is considered the go to place for people in constant motion. As an Internet entrepreneur, he is dedicated to constantly trying to develop new ways to bring content faster and closer to the end user in a more streamlined way. His excitement for statistics has allowed him to further develop systems that continuously produce accurate and fast-paced analytics to better optimize the approach by which Bit Rebels presents news and content. His graphic design background has proven to be an important tool when designing new systems and features for Bit Rebels since the development of solid and stable code depends entirely on their structure and implemented procedures. Richard currently resides in Stockholm, Sweden and directs the Bit Rebels offices in both Stockholm and Atlanta. You can reach Richard at richard@bitrebels.com

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Successor to the SR-71 Blackbird

The Switch

This is the successor to the SR-71 Blackbird, and it is gorgeous

(Photo by Lockheed Martin)

(Photo by Lockheed Martin)

The SR-71, arguably the country’s most recognizable spy plane after the U-2, was retired in 1998. But like many human retirees of the same generation, what became known as the Blackbird has had a healthy post-retirement career. From appearances in the “X-Men” franchise to cameos in the “Transformers” series, this super-speedy jet has taken off in modern popular culture.

So it’s only natural that the Blackbird’s successor might inspire similar appeal. More than a decade after the last SR-71 was decommissioned, Lockheed Martin has unveiled the gorgeous-looking SR-72. It flies just as far and twice as fast as its predecessor — and, in a twist, it’s now lethal, according to Aviationweek:

The SR-72 is being designed with strike capability in mind. “We would envision a role with over-flight ISR, as well as missiles,” Leland says. Being launched from a Mach 6 platform, the weapons would not require a booster, significantly reducing weight. The higher speed of the SR-72 would also give it the ability to detect and strike more agile targets. “Even with the -SR-71, at Mach 3, there was still time to notify that the plane was coming, but at Mach 6, there is no reaction time to hide a mobile target. It is unavoidable ISR,” he adds.

The jet accelerates by way of a two-part system. A conventional jet turbine helps boost the aircraft up to Mach 3, at which point a specialized ramjet takes over and pushes the plane even faster into hypersonic mode.

From Lockheed’s mock-ups, there doesn’t appear to be a bubble for the pilot — which suggests a windowless cockpit or fantasies about a future unmanned version of the plane. But let’s not get ahead of ourselves.

Brian Fung
Brian Fung covers technology for The Washington Post, focusing on electronic privacy, national security, digital politics and the Internet that binds it all together. He was previously the technology correspondent for National Journal and an associate editor at the Atlantic. His writing has also appeared in Foreign Policy, Talking Points Memo, the American Prospect and Nonprofit Quarterly.

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3D-printed toothbrush ‘perfectly’ cleans your teeth in just six seconds

3D-printed toothbrush ‘perfectly’ cleans your teeth in just six seconds

Blizzident 3D printed toothbrush

No, it isn’t the misshapen genitalia of the eponymous creature from the Alien movies: It’s a 3D-printed toothbrush that promises to give you “perfectly clean teeth” in just six seconds, with optimum plaque removal and protection of gums.

Called the Blizzident, it is essentially a custom-made toothbrush that’s perfectly formed to the shape of your teeth. You go to your dentist, get a 3D scan of your mouth, and then upload the model to the Blizzident website. The company uses a 3D printer to create an inverse mold of your mouth, and then attaches “soft, ultrafine bristles” to the mold to turn it into a toothbrush. (See: What is 3D printing?) To brush your teeth, you apparently just insert the Blizzident and then bite and grind your teeth 15 times — which takes roughly six seconds. Because the toothbrush is so perfectly formed, and because there are so many bristles, it cleans your teeth perfectly.

Rounding out the technical details, the Blizzident costs $300, and you’ll need to replace it every year ($160 for a new one, or $90 to have your current one refurbished with new bristles). Getting a scan from your dentist will probably cost between $100 and $200. To brush your teeth, you put toothpaste on your tongue, move it over your upper teeth, and then the act of biting and grinding will let the toothpaste flow over your lower teeth. The Blizzident apparently cleans your tongue, too, and the cleaning process (the Bass technique) is so perfect that you apparently don’t need to speed much time flossing. Blizzident is also usable by kids (but their teeth move around, so it’ll cost you dearly to get new molds made regularly).

The appeal of the Blizzident, of course, beyond having perfectly clean teeth, is the massive time saving. If you brush and floss your teeth properly, it should take you around 10 minutes per day; with Blizzident and some basic flossing, it takes a total of 60 seconds per day. Saving nine minutes per day equates to 3285 minutes — just under 55 hours — per year. If you’re the kind of person who wished that days were a bit longer, the Blizzident may be exactly what you’re looking for.

At this point we should note that the makers of Blizzident haven’t yet published any clinical trials for the new toothbrush, but they’re coming “soon.” Not that you really need FDA approval for a toothbrush, but in case you’re concerned, the plastics used in the production process have FDA approval. Some comments made by dentists elsewhere on the internet suggest that the Blizzident might be good at cleaning your teeth, but the short brushing duration might not give the fluoride in your toothpaste time to sink into your teeth. Mostly, though, the overwhelming reaction towards Blizzident is that people want to see it in action, with some real-world testing, before they spend $300 of their hard-earned dollars.

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U.S. Military begins rolling on airless tires

U.S. Military begins rolling on airless tires

Published September 19, 2013

FoxNews.com
  • terrainarmor-mv850.jpg
    Polaris
  • terrainarmor2.jpg
    Polaris
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    Polaris
  • airless-ford-660.jpg

Air compressor manufactures take note.

Polaris has begun production of a non-pneumatic tire for all terrain vehicles.

The company has begun deliveries of its MV850 ATV fitted with the flat-proof TerrainArmor tires to the U.S. Special Operations Forces, and plans to introduce a retail version soon.

The innovation is more of a wheel/tire combination that features a rubber tread band supported by a polymeric web for structure that is also able to deform like an air-filled tire as it rolls over obstacles to provide cushioning.

Polaris says the tires can take a shot from a .50 caliber round without failing, and one was driven on for over 1,000 miles off-road after it was punctured by a railroad spike. They’ve been tested up to 5,000 miles on ATVs packed with a full combat load.

Earlier this year, the company donated several of the vehicles to the Salvation Army to assist with relief efforts in the wake of the Moore tornado in Oklahoma, and says they performed perfectly while traversing the debris left by the storm.

A Polaris representative tells FoxNews.com that they are working on versions that will fit additional vehicles in the company’s lineup, including some of its side-by-side UTVs.

An official date hasn’t been announced, but he added that consumer sales could begin within six months.

Read more: http://www.foxnews.com/leisure/2013/09/19/us-military-begins-rolling-on-airless-tires/?intcmp=features#ixzz2fPFr6wbG

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World’s thinnest glass shatters records — by accident

World’s thinnest glass shatters records — by accident

Published September 13, 2013

FoxNews.com
  • researchers.jpg

    Cornell University graduate student Pinshane Huang and Professor David Muller with a model that depicts the atomic structure of glass. They were the first to directly image the world’s thinnest sheet of glass. (Jason Koski/University Photography)

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    A microscopic photo of a sheet of glass only two atoms thick blends with an artist’s conception to show the structural rendering. (Kavli Institute at Cornell for Nanoscale Science)

They’re shattering records. 

At just one molecule thick, researchers at Cornell and Germany’s University of Ulm have discovered the world’s thinnest sheet of glass — by accident.

‘This is the work that, when I look back at my career, I will be most proud of.’

– David A. Muller, director of the Kavli Institute at Cornell for Nanoscale Science 

The unexpected discovery came after scientists notices “muck” on their graphene, a two-dimensional sheet of carbon atoms shaped in a chicken-wire crystal formation that they had been studying.

It turns out the smudge they thought they saw was actually a “pane” of glass so thin that its individual silicon and oxygen atoms are visible only via an electron microscope.

“It’s the first time that anyone has been able to see the arrangement of atoms in a glass,” director of the Kavli Institute at Cornell for Nanoscale Science David A. Muller told the Cornell Chronicle. “This is the work that, when I look back at my career, I will be most proud of.”

Besides making it into the Guinness Book of World Records, the discovery may lead to the creation of ultra-thin material that could improve the performance of processors in computers and smartphones.

The research was funded by the National Science Foundation through the Cornell Center for Materials Research.

Read more: http://www.foxnews.com/science/2013/09/13/world-thinnest-glass-shatters-records-accident/?intcmp=features#ixzz2f5SV1BDb

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After Watson, IBM Looks to Build ‘Brain in a Box’

After Watson, IBM Looks to Build ‘Brain in a Box’

By Jennifer Booton

Your World Tomorrow

Published August 22, 2013

FOXBusiness
  • IBM Watson Supercomputer, IBM
    REUTERS

Imagine Watson with reason and better communication skills.

The Watson supercomputer may be able to beat reigning Jeopardy champions, but scientists at IBM (IBM) are developing new, super-smart computer chips designed from the human brain — and that might ultimately prove much more impressive.

These new silicon “neurosynaptic chips,” which will be fed using about the same amount of energy it takes to power a light bulb, will fuel a software ecosystem that researchers hope will one day enable a new generation of apps that mimic the human brain’s abilities of sensory perception, action and cognition.

It’s akin to giving sensors like microphones and speakers brains of their own, allowing them to consume data to be processed through trillions of synapses and neurons in a way that allows them to draw intelligent conclusions.

IBM’s ultimate goal is to build a chip ecosystem with ten billion neurons and a hundred trillion synapses, while consuming just a kilowatt of power and occupying less than a two-liter soda bottle.

“We want to create a brain in a box.”

– IBM’s Dharmendra Modha 

“We are fundamentally expanding the boundary of what computers can do,” said Dharmendra Modha, principal investigator of IBM’s SyNAPSE cognitive computing project. “This could have far reaching impacts on technology, business, government and society.”

The researchers envision a wave of new, innovative “smart” products derived from these chips that would alter the way humans live in virtually all walks of life, including commerce, logistics, location, society, even the environment.

“Modern computing systems were designed decades ago for sequential processing according to a pre-defined program,” IBM said in a release. “In contrast, the brain—which operates comparatively slowly and at low precision—excels at tasks such as recognizing, interpreting, and acting upon patterns.”

These chips would give way to a whole new “cognitive-type of processing,” said Bill Risk, who works on the IBM Research SyNAPSE Project, marking one of the most dramatic changes to computing since the traditional von Neumann architecture comprised of zeros and ones was adopted in the mid-1940s.

“These operations result in actions rather than just stored information, and that’s a whole different world,” said Roger Kay, president of Endpoint Technologies Associates, who has written about the research. “It really allows for a human-like assessment of problems.”

It is quite a complex system, and it is still in early stages of development. But IBM researchers have rapidly completed the first three phases of what will likely by a multi-stage project, collaborating with a number of academic partners and collecting some $53 million in funding. They are hopeful the pace of advancement will continue.

Modha cautioned, however, this new type of computing wouldn’t serve as a replacement for today’s computers but a complementary sibling, with traditional analog architecture serving as the left brain with its speed and analytic ability, and the next era of computing acting as the right cortex, operating much more slowly but more cognitively.

“Together, they help to complete the computing technology we have,” Modha said.

Providing a real-life example of how their partnership might one-day work, Kay imagined a medical professional giving triage to a patient.

Digital computers would provide basic functions such as the patient’s vitals, while the cognitive computer would cross reference data collected at the scene in real-time with stored information on the digital computer to assess the situation and provide relevant treatment recommendations.

“It could be a drug overdose or an arterial blockage, a human might not know which is which [from the naked eye],” explains Kay. “But a [cognitive] computer could read the symptoms, reference literature, then vote using a confidence level that can kind of infer which one is more likely the case.”

Endless Possibilities Seen

The IBM researchers have put together building blocks of data to make cognitive applications easier to build and to create an ecosystem for developers. The data come in the form of “corelets” that each serve a particular function, such as the ability to perceive sound or colors.

So far they have developed 150 corelets with the intention to eventually allow third parties to go through rigorous testing to submit more. Eventually, corelets could be used to build “real-life cognitive systems,” researchers hope.

To help get the ball rolling, the researchers envisioned a slew of product ideas that would make perfect use of these genius chips in real-world functions.

Here are just a few:

-An autonomous robot dubbed “Tumbleweed” could be deployed for search and rescue missions in emergency situations. Researchers picture the sphere-shaped device, outfitted with “multi-modal sensing” via 32 mini cameras and speakers, surveying a disaster and identifying people in need. It might be able to communicate with them, letting them know help is on its way or directing them to safety.

-For personal use, low-power, light-weight glasses could be designed for the near blind. Using these chips, which would recognize and analyze objects through cameras, they’d be able to plot a route through a crowded room with obstacles, directing the visually-impaired through speakers.

-Putting these chips to use in a business function, the researchers foresee a product they’ve dubbed the “conversation flower” that could process audio and video feeds on conference calls to identify specific people by their voice and appearance while automatically transcribing the conversation.

-Giving a glimpse into its potential use in the medical world, a thermometer could be developed that could not only measure temperature, but could also be outfitted with a camera that would be able to detect smell and recognize certain bacterial presence based on their unique odor, giving an alert if medical attention is needed.

-In an environmental function, researchers could see this technology being outfitted on sensor buoys, monitoring shipping lanes for safety and environmental protection.

Given the fluid motion of the project, it’s unclear how long it will take for the first generation of cognitive computers to begin applying themselves in real-world applications, but Modha and his team are optimistic they will be crafted sooner than later.

“We need cognitive systems that understand the environment, can deal with ambiguity and can act in a real-time, real-life context,” Modha said. “We want to create a brain in a box.”

Read more: http://www.foxbusiness.com/technology/2013/08/22/after-watson-ibm-looks-to-build-brain-in-box/#ixzz2dagDD2vE

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Researchers control each others’ body movements using only their brains

Researchers control each others’ body movements using only their brains

Published August 28, 2013

FoxNews.com
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    Andrea Stocoo, or subject 2 (the “Receiver”) with his right hand resting slightly above the “fire” key on the keyboard. The screen behind the subject shows the Sender’s game screen which is not seen by the Receiver. (University of Washington)

There’s still no cure for the common cold, but soon we may be able to control each others’ body movements.

Researchers at the University of Washington have successfully completed an experiment where one researcher was able to send a brain signal over the Internet to control the hand movements of his colleague.

“The Internet was a way to connect computers, and now it can be a way to connect brains,” experiment participant and researcher Andrea Stocco told ScienceNewsDaily. “We want to take the knowledge of a brain and transmit it directly from brain to brain.”

Stocco and fellow researcher Rajesh Rao donned swim caps with electrodes hooked up to an electroencephalography machine that reads electrical activity in the brain. The two men sat in separate labs and a Skype connection was set up so they could communicate during the experiment, although Rao and Stocco could not see each other.

Rao sat before a computer screen and played a video game using only his mind. When he wanted to fire a cannon, he imagined moving his hand to hit the “fire” button without actually moving any part of his body.

Almost simultaneously, Stocco involuntarily moved his hand to push the space bar on his keyboard as though to hit the “fire” button.

“It was both exciting and eerie to watch an imagined action from my brain get translated into actual action by another brain,” Rao said. “This was basically a one-way flow of information from my brain to his. The next step is having a more equitable two-way conversation directly between the two brains.”

Stocco likened the feeling of having Rao move his finger through thought to that of a twitch.

“I think some people will be unnerved by this because they will overestimate the technology,” assistant professor in psychology at the UW’s Institute for Learning & Brain Sciences and Stocco’s wife Chantel Prat said. “There’s no possible way the technology that we have could be used on a person unknowingly or without their willing participation.”

The University of Washington experiment sounds like something out of a science fiction movie. Stocco jokingly likened the results to the “Vulcan mind meld.”

Stocco explains that should they continue to be successful in their research, it could eventually result in helping a flight attendant land a plane should the pilot become incapacitated.

Read more: http://www.foxnews.com/science/2013/08/28/researchers-control-each-other-body-movements-using-only-their-brains/?intcmp=features#ixzz2dQekawI0

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No Wire, No Power Source – New Devices Work in Thin Air

Devices Connect with Borrowed TV Signals and Need No Power Source

Devices that can make wireless connections even without an on-board battery could spread computing power into everything you own.

 WHY IT MATTERS

A novel type of wireless device sends and receives data without a battery or other conventional power source. Instead, the devices harvest the energy they need from the radio waves that are all around us from TV, radio, and Wi-Fi broadcasts.

These seemingly impossible devices could lead to a slew of new uses of computing, from better contactless payments to the spread of small, cheap sensors just about everywhere.

“Traditionally wireless communication has been about devices that generate radio frequency signals,” says Shyam Gollakota, one of the University of Washington researchers who led the project. “But you have so many radio signals around you from TV, Wi-Fi, and cellular networks. Why not use them?”

Gollakota and colleagues have created several prototypes to test the idea of using ambient radio waves to communicate. In one test, two credit-card-sized devices—albeit with relatively bulky antennas attached—were used to show how the technique could enable new forms of payment technology. Pressing a button on one card caused it to connect with and transfer virtual money to a similar card, all without any battery or external power source.

Here is a video of the prototypes:
“In that demonstration, the LEDs, touch sensors, microcontrollers, and the wireless communication are all powered by those ambient TV signals,” says Gollakota.

The devices communicate by varying how much they reflect—a quality known as backscatter—and absorb TV signals. Each device has a simple dipole antenna with two identical halves, similar to a classic “rabbit ears” TV aerial antenna. The two halves are linked by a transistor, which can switch between two states. It either connects the halves so they can work together and efficiently absorb ambient signals, or it leaves the halves separate so they scatter rather than absorb the signals. Devices close to one another can detect whether the other is absorbing or scattering ambient TV signals. “If a device nearby is absorbing more efficiently, another will feel [the signals] a bit less; if not, then it will feel more,” says Gollakota. A device encodes data by switching between absorbing and not absorbing to create a binary pattern.

The device gets the power to run its electronics and embedded software from the trickle of energy scavenged whenever its antenna is set to absorb radio waves.

In the tests, the devices were able to transfer data at a rate of one kilobit per second, sufficient to share sensor readings, information required to verify a device’s identity, or other simple tidbits. So far the longest links made between devices are around 2.5 feet, but the University of Washington team could extend that to as much as 20 feet with some relatively straightforward upgrades to the prototypes. The researchers also say the antennas of backscatter devices could be made smaller than those in the prototypes.

Gollakota says the devices could be programmed to work together in networks in which data travels by hopping from device to device to cover long distances and eventually connect to nodes on the Internet. He imagines many of a person’s possessions and household items being part of that battery-free network, making it possible to easily find a lost item like your keys. “These devices can talk to each other and know where it is,” he says.

The researchers tested that scenario by placing tags on cereal boxes lined up on a shelf to mimic a grocery store or warehouse. Each tag communicated with its nearest neighbor to check if it was in the correct place, and blinked its LED if it was not.

That demonstration impresses Kristofer Pister, a professor at the University of California, Berkeley, whose work on tiny devices dubbed “smart dust,” which gather data from just about anywhere, helped spawn many research projects on networked sensors. Using TV signals to enable such applications without batteries is “a really clever idea,” he says.

While Pister and others around the world—including the Washington group—have spent years creating the technology needed to make cheap, compact sensors practical (see “Smart Specks”), such networks are relatively scarce. Josh Smith, a University of Washington professor who led the backscatter project with Gollakota, says that being able to do without onboard power could help.

Bhaskar Krishnamachari, who works on sensor networks at the University of Southern California, notes that in some rural areas and indoor environments, there may not be enough ambient radio waves to support the battery-free approach. “For many practical implementations, an onboard battery may be unavoidable,” he says. “However, the proposed approach may go some way in extending the time between battery-charging events.”

The backscatter communication technology was developed by Gollakota with Smith and David Wetherall, also a University of Washington professor, along with grad students Vincent LiuAaron Parks, and Vamsi Talla. A paper on the technology won best paper award at the ACM Sigcomm conference in Hong Kong this week.

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