Harvard’s Natural Sciences Lecture Demonstrations team produced a remarkable video showing fifteen uncoupled pendulums. The pendulums were designed so as to have frequencies of 51 – 65 swings per minute. Over the course of a minute they go in and out of phase with each other. You’ll see them at […]
Monthly Archives: July 2011
6 posts
Times have changed since Cyrus Field laid the first transatlantic telegraph cable. Now, Greg Mahlknecht has compiled a comprehensive list of current underseas cables plotted on a handy Google Map interface. Here’s Greg’s Cable Map (via Gizmodo, Boing Boing):
Last month, I spoke at the 2011 International Microwave Symposium in Baltimore in a workshop on innovative and highly accurate local location systems. My slides are now available online. This workshop presentation explains basics of near-field physics and near-field RF links. Then, this presentation explains the implementation and performance of […]
As usual, Steven J. Crowley summarizes the latest Experimental Radio Applications at the FCC. Here are a few highlights: LightSquared filed an application and exhibits for special temporary authority to conduct testing to determine the effects of L-band LTE signals on GPS devices in a live field-test environment. The testing […]
This just in from Information Week (via Dwayne Hendricks, WA8DZP on Twitter): Ultrawideband Takes Us Closer To Star Trek Tricorders. Is it a miraculous UWB radar that monitors your heart rate, blood pressure, and cholesterol? Alas, no. It’s a UWB body area network. Ultra-wideband works great when you have lots […]
Saturday July 9 marks the centennial of John Archibald Wheeler’s birth. Wheeler pioneered the theory of nuclear fission along with Niels Bohr. He contributed to the Manhattan Project during the Second World War. Afterward, he led a revival of general relativity theory including coining such memorable terms as “wormholes” and […]