Physics tip sheet #41 - April 5, 2004
...ed a lot of attention when it was demonstrated for electromagnetic waves in so-called left handed materials. The effect has now been observed in liquid surface waves. The authors of this paper placed an array of copper cylinders in a tank of liquid. A source generated waves on one side of the cylinders, and the rese...Teachers turn to Tolkein to explain physics
...matching the pull of gravity on an object with the electromagnetic force on it from a current-carrying wire. Unfortunately, agreeing upon a new definition is still "many years" away and would also mean having to redefine the units of energy (the Joule) and force (the Newton). Also in this issue: Gravity hunt goes u...... Paris have managed to apply the same technique to electromagnetic signals at 2.45 GHz, a frequency close to the operating range of cell phones. The experiment heralds the possibility of improving cell phone communications in cities and other environments where obstructions, such as skyscrapers, may eventually aid c...ORNL nanoprobe creates world of new possibilities
...he silver nanoparticles, which produce an enormous electromagnetic field that contributes to increase the Raman scattering signal. The ORNL nanoprobe works with any surface to induce the SERS effect. "The significance of this work is that we are now able to perform direct analysis of samples -- even dry samples -- w...Free electron laser reaches 10 kW
... are steered into a wiggler--a device that uses an electromagnetic field to shake the electrons, forcing them to release some of their energy in the form of photons. As in a conventional laser, the photons are bounced between two mirrors and then emitted as a coherent beam of light. However, FEL operators can adjust......utiny today, with factors such as cigarette smoke, electromagnetic fields and use of medication being presented for discussion. It is hoped that out of the conference which has attracted top international experts from Europe, America, Asia and Australia - will be born an agenda for future research. CHILDREN with L...