Adidas unveiled the brazuca Final Rio Official Match Ball, the official match ball for the final of the 2014 FIFA World Cup. The ball will be used on 13th July when the top two sides battle it out for a place in history.
The design of brazuca Final Rio has been inspired by the green and gold on the FIFA World Cup trophy and is a variation of the previously released adidas brazuca Official Match Ball which was launched back in December last year.
In the build-up to the FIFA World Cup, adidas has used brazuca as part of its “all in or nothing” campaign and launched @brazuca on Twitter. After the launch in December 2013, @brazuca already has Continue reading
A new optical clock that is twice as accurate as any other has been unveiled by physicists in the US. The clock, which is based on a single aluminium ion, could remain accurate to within one second over3.7 billion years. The previous record was held by a clock with one mercury ion, which was good to one second in 1.7 billion years.This clock use a different principle quantum-interference protocol which makes it more accurate. Very soon this will be replacing our atomic clocks.
Stability is a must
An optical clock has three main components. The first is a highly stable “reference” frequency provided by a narrow optical absorption line in an atom or ion. The second element is a feedback system that “locks” the output of a laser (called the local oscillator) to the reference frequency. The third component provides a very precise
measurement of the frequency of the laser – usually with a “femtosecond comb”.
The most important component, however, is the atom or ion itself – which must absorb light over an extremely narrow and extremely stable frequency range. To ensure this, the atom or ion is isolated in a vacuum chamber and cooled to near Continue reading