Wednesday, June 22, 2011
Monday, August 16, 2010
Dipika Pallikal will spearhead India’s challenge in the 2010 Australian Open from Tuesday in Canberra, which will feature the cream of the international squash fraternity.Unseeded Ghosal will get his campaign underway with a clash against Australia’s former world numberone and 2008 champion David Palmer in the PSA Super Series six-day-long event. In the women’s section,18-year-old Chennai girl Dipika Pallikal faces the 2008 champion, Hong Kong’s Annie Au in the first-round draw.Men’s world number one, England’s Nick Matthew has been accorded the top billing.
Monday, August 2, 2010
Cesium clocks, like the one the National Institute of Standards and Technology uses to keep the official time in the U.S., generally rely on the microwave signals that electrons emit when they change energy levels to keep highly precise, consistent measurements of time (it's estimated that the NIST's current clock won't gain or lose a second for more than 60 million years).The cesium atoms are laser-cooled, then launched upward into a sensor cavity where instruments can tap into that microwave frequency that gives us our standard concept of the second, minute, hour, etc. A microgravity environment the atoms spend longer in the microwave chamber, and that should allow for better measurements of the microwaves emitted, making the Atomic Clock Ensemble in Space (ACES) 100 times more accurate as the clocks ticking away on satellites.
As a bonus, a single frame of reference in space could help atomic clocks back on the ground synchronize better, and it might even reveal if certain physical constants are as constant as physics says they are.