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2Physics Quote:
"Perfect transparency has never been realized in natural transparent solid materials such as glass because of the impedance mismatch with free space or air. As a consequence, there generally exist unwanted reflected waves at the surface of a glass slab. It is well known that non-reflection only occurs at a particular incident angle for a specific polarization, which is known as the Brewster angle effect. Our question is: is it possible to extend the Brewster angle from a particular angle to a wide range of or all angles, so that there is no reflection for any incident angle."
-- Jie Luo, Yuting Yang, Zhongqi Yao, Weixin Lu, Bo Hou, Zhi Hong Hang, Che Ting Chan, Yun Lai

(Read Full Article: "Ultratransparent Media: Towards the Ultimate Transparency"

Sunday, July 31, 2005

Quarks on a chip

Quarks are considered to be fundamental building blocks of matter and
are bound together inside subatomic particles by the 'strong nuclear
force' (see our past posting), which is weak when the quarks are close,
but increases steadily as they move apart, making it impossible to isolate
a single quark.

Quarks are the inner constituents of 99.9% of ordinary matter; yet it is
impossible to examine a single quark in the laboratory. Consequently,
some of their basic properties are not known, such as their precise masses
or why they exist in 6 different types.

In order to understand Quarks, the theory describing the strong nuclear
force, called Quantum Chromodynamics (QCD), has to be simulated on
huge computers. Particle physicists are embarking on a new attempt to
resolve the mysteries of quarks using 3 purpose-designed computers
that employ QCD-on-a-chip, or QCDOC, technology.

The first of the three computers is located at the University of Edinburgh
(UK), for use by the UK Quantum Chromodynamics (UKQCD)
collaboration of scientists from 7 British universities. The 2nd is at the
RIKEN Brookhaven Research Center in Brookhaven National Laboratory
in the USA. The 3rd, part of the US Department of Energy's programme
in high energy and nuclear physics, is also at Brookhaven.

A little slower than a PC's microprocessor, the QCDOC chip was designed
to consume a 10th of the electrical power, so that tens of thousands of
them could be put into a single machine. Each machine operates at a speed
of 10 Teraflops, or 10 trillion (i.e. million million) floating point operations
per second. By comparison, a regular desktop computer operates at a few
Gigaflops (a thousand million floating point operations per second), while
IBM's BlueGene, a close relative of QCDOC and the fastest computer in
the world, operates at more than 100 Teraflops.



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