[tt] Next Big Future - 2 new articles
Eugen Leitl
<eugen at leitl.org> on
Sun Apr 27 20:01:03 UTC 2008
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Date: Sun, 27 Apr 2008 12:33:38 -0400
To: eugen <eugen at leitl.org>
Subject: Next Big Future - 2 new articles
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"[2]Next Big Future" - 2 new articles
1. [3]Saskatchewan's portion of the Bakken oilfield
2. [4]Like a wine cork, buckypaper gets wider when stretched
3. [5]More Recent Articles
4. [6]Search Next Big Future
[7]Saskatchewan's portion of the Bakken oilfield
[8]When Crescent Point first acquired Bakken lands and production in
the Viewfield area near Stoughton in 2006, the initial estimate was
500 million to one billion barrels of oil in place.
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Saskatchwen Bakken production is at least 45,000 barrels of oil per
day (Just adding teh most recent Crescent Point and Petrobank
numbers). [15]The North Dakota and Montana Bakken production was
75,000 barrels of oil per day as of October 2007. So the combined
Canada and USA Bakken numbers are at least 120,000 barrels of oil per
day.
"Now we're saying four to five billion barrels of oil in place,''
Stangl said. "We're not saying what the reserves are; the reserves
will be a percentage of that. But it gives you an idea how big the
pool is."
While it remains to be seen how much of that oil is recoverable,
Stangl said production from the Viewfield area alone has increased to
about 30,000 barrels of oil per day (BOPD) from virtually nothing five
years ago. [16]I had covered Crescent Points latest production news.
Another major player in the [17]Bakken is Petrobank Energy, which has
about 12,000 BOPD of Bakken production in Saskatchewan. [18]Petrobank
gets about 150,000 barrels per well
The Calgary-based company plans to drill 150 wells and spend $400
million in the area this year alone.
Saskatchewan's Bakken play has produced about four million barrels of
oil since production began in 2002.
[19][advancednano?i=4k9WZl]
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[35]Like a wine cork, buckypaper gets wider when stretched
[36]Specially designed carbon nanotube sheets, dubbed "buckypaper,"
can increase in width when stretched. The buckypaper can also increase
in both length and width when uniformly compressed.
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Illustration of the oppositely directed lateral bending on forming
a nanotube sheet strip into a ring, when the Poisson's ratio is
positive (left) or negative (right). No lateral bending occurs when
the Poisson's ratio is zero (middle).
The ability to tune Poisson's ratio could be exploited for designing
sheet-derived composites, artificial muscles, gaskets, stress and
strain sensors and chemical sensors.
A thick nanotube sheet could also be made to wrap around a concave,
convex, or saddle shaped surface depending on the sign of Poisson's
ratio -- something that could come in useful for forming shaped
composites.
By choosing the ratio of SWNTs and MWNTs, the Poisson ratio can be
adjusted to zero, which is useful for designing cantilevers for
sensing that do not distort in width during bending. Tensile sensors
can provide a sensitivity that is proportional to the volume change
produced by stretch, and this volume change can be increased by the
team's discovery of the tunability of Poisson's ratio.
Picture of a model used to predict buckypaper properties, where
adjacent layers are coupled like the struts in a collapsible wine
rack.
This transition can be understood by relating the deformation modes of
the nanotube sheets to those of a collapsible wine rack. If two
neighboring nanotube layers are coupled like the struts in a
compressible wine rack, Poisson's ratio is positive and the rack
becomes narrower when stretched. In contrast, if the rack is blocked
so that it can no longer be collapsed but the struts are stretchable,
increases in strut length produce a negative Poisson's ratio.
Baughman and his team subsequently found that the nanotube sheets
containing both single-walled and multi-walled nanotubes had a 1.6
times higher strength-to-weight ratio, 1.4 times higher
modulus-to-weight ratio and a 2.4 times higher toughness than sheets
made of SWNTs or MWNTs alone.
FURTHER READING
[43]A 2006 paper on using nanotubes for artifical muscles
[44][advancednano?i=veJtEU]
[45][advancednano?i=1hQJxEG] [46][advancednano?i=xvy8WBG]
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Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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