Renaissance architects built into their cathedrals whispering galleries, circular chambers designed to amplify and direct sound waves so that, when standing in the right spot, a whisper could be heard from across the room. Scientists at the University of Pennsylvania have applied the same principle on the nanoscale to drastically reduce emission lifetime, a key property of … [Read more...]
Operation Principle of LED Power Supply- Circuitry
This video details the benefits of using stabilized power supplies with pulse-width modulation to power LEDs, including obligatory circuit protection and electromagnetic suppression and the ability to smooth the incoming current filter. When choosing a power supply, full LED load for current consumption should be considered, i.e. the reserve power supply must be about one-third … [Read more...]
Companies Collaborate to Advance Earthquake Forecasting
QuakeFinder and the SETI Institute will collaborate to accelerate research toward a practical solution for short-term forecasting of major earthquakes based on electromagnetic precursory signals. This work builds upon the laboratory experiments of Institute researcher Dr. Friedemann Freund and on the field work of QuakeFinder collecting earthquake data and correlating it with … [Read more...]
Ambient Electromagnetic Energy Harnessed for Small Electronic Devices
Researchers have discovered a way to capture and harness energy transmitted by radio and television transmitters, cell phone networks and satellite communications systems. By scavenging this ambient energy from the air around us, the technique could provide a new way to power networks of wireless sensors, microprocessors and communications chips.Manos Tentzeris, a professor in … [Read more...]
U.S. Navy Growlers Use Electromagnetic Noise to Confuse Enemy Signals
The U.S. Navy has been deploying a small fleet of supersonic EA-18 Growler jets in Libya to "jam" Moammar Kadafi's ground radar, giving NATO fighters and bombers free rein to strike tanks, communication depots and other strategic targets. The United States is spending billions of dollars in a massive effort to respond to electronic warfare. These jammers, for instance, spew … [Read more...]
Researchers Observe Squeezed Light from Single Atom
Light is usually described as a wave, but at the most fundamental quantum level this wave consists of discrete particles called photons. A team at the Max Planck Institute of Quantum Optics, has now observed that the light emitted by a single atom may exhibit much richer dynamics. Strongly interacting with light inside a cavity, the atom modifies the wave-like properties of the … [Read more...]
President Obama Launches Manufacturing Initiative
President Obama recently announced a new partnership between the government, industries and leading universities to speed the movement of technological advances to commercial users. Mr. Obama said federal agencies would invest more than $500 million to seed the initiative. Of that, $70 million is to go to robotics projects such as a boom-box-size robot that inspects sewer … [Read more...]
Acoustic Cloaking Device Could Make Ships Invisible to Sonar
Scientists at Duke University in North Carolina have come up with a way to make objects invisible to sound waves, which could possibly lead to the development of ships that are undetectable by sonar. Described as an "invisibility cloak" for sound waves, the technique involves surrounding an object with several layers of plastic plates, each with holes in a specific pattern. The … [Read more...]
Canadian Spectrum Auction Passes $2 Billion Point in Bidding
The second week of Industry Canada's auction of available wireless spectrum saw bidding exceed $2 billion. By round 16 on Monday, June 2, bidding totals had passed the $1 billion to $1.5 billion projected by a number of industry analysts. The auction is expected to continue for another few weeks. Forty percent of the available spectrum is available only to new entrants into the … [Read more...]
Impact of Materials on Microwave Cable Performance
A new white paper from W. L. Gore & Associates, Inc., “Impact of Materials on Microwave Cable Performance,” presents important factors to consider when selecting microwave/RF cable assemblies to ensure reliable performance. It is critical to identify all of the application constraints that can affect the cables’ overall performance to preserve signal integrity and product … [Read more...]
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