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Electromagnetic


— Science

Graphene-based nano-antennas may enable cooperating smart dust swarms

By - February 3, 2014
Smart dust. Utility fog. Programmable matter. Grey and blue goo. Cooperating swarms of micron-sized devices (motes) offer completely new solutions and capabilities that can hardly be imagined. However, cooperation requires communication, and conventional radio or optical networking simply isn't practical at this size. Now researchers at Georgia Tech have invented a plasmonic graphene nano-antenna that can be efficiently used at millimeter radio wavelengths, taking one more step toward smart dust. Read More
— Military

Lemur Studio Design develops mine detector in a shoe

By - January 26, 2014 7 Pictures
Boot insoles can turn a pair of really uncomfortable brogues into podiatric clouds that can take a long hike and remove the foot ache. Now, Lemur Studio Design based in Bogota, Colombia, has come up with a concept for insoles that won’t just save your instep, but could save your life. A submission to the World Design Impact Prize 2013-2014 competition, SaveOneLife is a wearable mine detector that fits in a shoe and warns the wearer if and where a potentially deadly landmine might lurk nearby. Read More
— Science

Fabricated nanoantennas used to produce high-resolution holograms

By - November 24, 2013 4 Pictures
Holography is one of the more dramatic forms of photography, in which a three-dimensional image is stored on a photographic plate in the form of interference fringes. Researchers at Purdue University in Indiana have developed a different approach, in which a 3D image is stored in a structure of thousands of V-shaped nanoantennas etched into an ultrathin gold foil. The new approach dramatically shrinks the size of a hologram, potentially enabling photonic and plasmonic devices and optical switches small enough to be integrated into computer chips. Read More
— Science

New tech could beam power from roadside stations to passing electric cars

By - November 14, 2013
Among the concepts put forth for decreasing the range anxiety associated with electric cars, one is to embed electrical coils within the asphalt. This would allow vehicles to wirelessly draw power from the road as they traveled, although it would also involve having to tear up existing roads to install those coils. An alternative could be on its way, however. Scientists at North Carolina State University are developing a system in which power could be transmitted from stationary roadside stations to mobile receiver coils in cars passing by. Read More
— Science

Oops! Invisibility cloaks actually make objects easier to see

By - November 12, 2013 4 Pictures
It's often a case of swings and roundabouts. If you save money by buying a house out of town, you spend more time and money commuting. If you really measure the momentum of an electron, you have no idea where the little guy is located. And now, according to a new analysis by a pair of University of Texas electrical engineers, the better an object is hidden by an invisibility cloak at a given wavelength of light, the easier it is to see at other wavelengths. Swings and roundabouts. Read More
— Electronics

Power-harvesting device converts microwave signals into electricity

By - November 7, 2013 2 Pictures
Joining the ranks of devices designed to harvest energy from ambient electromagnetic radiation comes an electrical circuit from researchers at Duke University that can be tuned to capture microwave energy from various sources, including satellite, sound or Wi-Fi signals. The researchers say the device converts otherwise lost energy into direct current voltage with efficiencies similar to that of current solar cells. Read More
— Science

HAARP ionospheric research program set to continue

By - July 24, 2013 13 Pictures
Reports that the High Frequency Active Auroral Research Program (HAARP) had been shut down permanently were apparently a bit premature. According to HAARP program manager James Keeney, the facility is only temporarily off the air while operating contractors are changed. So why does anyone care? Despite being associated with various natural disasters over the past two decades by the conspiracy fringe, HAARP is in reality a facility for studying the ionosphere. Let's take a look at the goings on at HAARP – past, present, and future. Read More
— Telecommunications

Plug pulled on the world's last commercial electric telegraph system

By - July 16, 2013 10 Pictures
After linking the world for 167 years, the commercial electric telegraph is no more. The speed with which electromagnetic telegraph systems took over both short- and long-distance communication in the mid 19th century set the pattern which telephones and the internet would follow, spawning the connected world we now live in. The closing down of India's state-run Bharat Sanchar Nigam, Ltd. (BSNL) network on Monday sparked a last-minute rush of people looking to send a souvenir telegram to mark the historic event before the electric telegraph was relegated to the history books. Read More
— Health and Wellbeing

VEPS sensor detects signs of traumatic brain injury before it's too late

By - June 25, 2013 9 Pictures
Victims of penetrating head injuries usually seek immediate attention, as the hole in their skull is difficult to miss. However, people with closed-head injuries may show few immediate signs of the trauma, and appropriate diagnostic equipment (primarily a CAT scanner) is often not immediately available. A Mexican-US team of researchers has now developed a simple, easy to operate, and inexpensive electromagnetic sensor for traumatic brain injuries, suited to on site use by field personnel and paramedics. Read More
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