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Metal strength tested at the nanoscale | |
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Gizmorama - Metal strength tested at the nanoscale
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Good Morning,
Have you made the switch from XP to Vista? If you have
Microsoft has released its first service pack for the
operating system. Here is a link to more on the update and
if you really need it...
http://www.pcworld.com/businesscenter/article/143572/windows_vista_sp1_available_nowdo_you_need_it.html
Until Tomorrow,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
Email your comments
P.S. You can discuss this issue or any other topic in the new
Gizmorama forum. Check it out here...
http://archives.gophercentral.com/forum/forums/forum-view.asp?fid=23
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Metal strength tested at the nanoscale
U.S. materials scientists are studying metals at the nano
scale, testing the strength of wires a thousand times thinner
than a human hair. The research at the University of Pennsylvania
School of Engineering and Applied Science has enabled engineers
to construct a theoretical model to predict the strength of such
metals. Using that model, they've found that, while metals tend
to be stronger at nanoscale volumes, their strengths saturate at
around 10-50 nanometers diameter, at which point they also become
more sensitive to temperature and strain rate. Such prediction
of different strength regimes of nanosolids is important for
future application and engineering design of nanotechnology,
the scientists said. Associate Professor Ju Li and his
collaborators at the Georgia Institute of Technology said
that unlike previous models, their prediction can be directly
compared with experiments performed at realistic temperature
and loading rates. The research appeared as a cover article in
Volume 100 of the journal Physical Review Letters.
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NASA: Arctic Sea ice still at risk
The U.S. space agency said updated satellite data show Arctic
Sea ice has increased in some colder-than-average areas but
continues to decline elsewhere. National Aeronautics and Space
Administration scientists said the increased area of sea ice
this winter is due to recent weather conditions, while the
decline in perennial ice reflects the longer-term warming
climate trend. Perennial sea ice is the long-lived, year-round
layer of ice that remains even when the surrounding short-lived
seasonal sea ice melts during the summer. NASA said it is that
perennial sea ice, left from the summer melt period, that has
been rapidly declining from year to year. The latest satellite
data show where perennial ice used to cover 50 percent to 60
percent of the Arctic. This year it covers less than 30 percent.
Very old ice that remains in the Arctic for at least six years
comprised more than 20 percent of the Arctic area in the mid-to-
late 1980s, but this winter it decreased to only 6 percent.
Researchers said the Arctic ice cover is much thinner overall
and thus in a more vulnerable state heading into the summer
melt season.
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STS-123's third spacewalk is completed
U.S. astronauts Rick Linnehan and Robert Behnken completed the
third spacewalk of the STS-123 mission at 1:44 a.m. EDT Tuesday.
The National Aeronautics and Space Administration said the
primary goal of the six-hour, 53-minute excursion was the
completion of the outfitting of Dextre, the Canadian-produced
mobile servicing system on the International Space Station.
Linnehan and Behnken installed a spare parts platform and tool
handling assembly for Dextre and, among other tasks, attached
critical spare parts to an external stowage platform. NASA
controllers in Houston said Behnken and astronaut Mike Foreman
are to begin the mission's fourth spacewalk at 6:28 p.m. EDT
Thursday. They were to perform tasks that include a shuttle
tile repair test and replacement of a space station circuit
breaker.
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