• March 2012
    M T W T F S S
    « Feb   Apr »
     1234
    567891011
    12131415161718
    19202122232425
    262728293031  

CU and NIST Scientists Reveal Inner Workings of Magnets, a Finding That Could Lead to Faster Computers.

University of Colorado (03/14/12) Margaret Murnane

 Researchers at the University of Colorado Boulder and the U.S. National Institute of Standards and Technology (NIST) used specialized X-ray lasers to reveal the inner workings of magnets, a breakthrough they say could lead to faster and smarter computers.  Using a light source that creates X-ray pulses one quadrillionth of a second in length, the researchers were able to observe how magnetism in nickel and iron atoms works, and found that each metal behaves differently.  “The discovery that iron and nickel are fundamentally different in their interaction with light at ultrafast time scales suggests that the magnetic alloys in hard drives could be engineered to enhance the delivery of the optical energy to the spin system,” says NIST’s Tom Silva.  The researchers found that different kinds of magnetic spins in metal scramble on different time scales.  “What we have seen for the first time is that the iron spins and the nickel spins react to light in different ways, with the iron spins being mixed up by light much more readily than the nickel spins,” Silva says.  The discovery could help researchers develop a magnetic system optimized for maximum disk drive performance.

MORE

Pi Day: How the ‘Irrational’ Number Pushed the Limits of Computing

Government Computer News (03/14/12) William Jackson

The challenge of determining the value of Pi has helped push the envelope of computing. “It has played a role in computer programming and memory allocation and has led to ingenious algorithms that allow you to calculate this with high precision,” says mathematician Daniel W. Lozier, retired head of the mathematical software group in the U.S. National Institute of Standards and Technology’s Applied and Computational Mathematics Division. “It’s a way of pushing computing machinery to its limits.” Memory is crucial in executing calculations, as are techniques for calculating efficiently, given the large strings of numbers involved. The calculation of Pi to longer and longer number strings has improved along with the advancement of computers, and the current record-holder is Japan’s T2K Supercomputer, which calculated the value to 2.6 trillion digits in about 73 hours and 36 minutes. That marks a considerable upgrade from the ENIAC computer’s 1949 estimation of Pi to 2,037 digits, which took 70 hours. Ten years later an IBM 704 was able to calculate Pi to 16,157 places in four hours and 20 minutes. “Pi serves as a test case for mathematical studies in the area of number theory,” Lozier notes.

MORE