[tt] Next Big Future - 2 new articles
Eugen Leitl
<eugen at leitl.org> on
Tue Aug 19 14:30:03 UTC 2008
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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]High Superconducting temperature predicted for boron-doped
diamond and spinhole theory for all superconductors
2. [4]Materialise a current leader in Rapid Manufacturing
3. [5]More Recent Articles
4. [6]Search Next Big Future
[7]High Superconducting temperature predicted for boron-doped diamond and
spinhole theory for all superconductors
[8]There is superconducting in super hard boron doped diamond up to
45K according to a computational model.
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T A Study calculates that boron-doped diamond (BC5) should be
superconducting on up to temperatures of 45 K, which, if borne out
in experiments, would make this class of material with the highest
with the highest transition temperature into a superconducting
state mediated by the passing of phonons.
[15]A paperby Peter Wachter proposes that spin holes in anti
-ferromagnetic clusters combine to make nonmagnetic bipolarons, which
can condense and lead to superconductivity. (Cu, Pu and Fe high Tc
superconductors: all the same mechanism.)
In conclusion, it has been shown that the parent materials of high
Tc superconductors are antiferromagnets, where long - range
magnetic order has been interrupted by 5 - 20% substitution of the
magnetic ions by nonmagnetic ions. These nonmagnetic ions have been
provoked by chemical doping, but are of the same kind as the
magnetic ions, only in another valence state or another spin
configuration. The remaining short - range antiferromagnetic
clusters or fluctuations will surround such a spin hole with charge
as a magnetic polaron. Two such polarons have an attractive
interaction and form a boson nonmagnetic bipolaron. This can make a
Bose condensation and lead to superconductivity, which has been
shown in many papers by Alexandrov and Mott. We could show, that
the same mechanism works for all three (Cu, Pu and Fe) high Tc
superconducting systems.
[16]A superconducting paper examines the issue of how the pairing of
electrons works and which physical model might be a better
explaination. A "pairing glue" in the Hubbard and t-J models is
basically a question about the dynamics of the pairing interaction.
[17]Synthesis and Microstructural Studies of Iron Based LaO1 -xFxFeAs
Superconducting Materials
[18][advancednano?i=fMDhwC]
[19][advancednano?i=CtHWPI] [20][advancednano?i=f2EhdI]
[21][advancednano?i=NYapGI] [22][advancednano?i=95CyKi]
[23][advancednano?i=IzXBLi] [24][advancednano?i=U5mR1i]
[25][advancednano?i=KCdj0I] [26][advancednano?i=RPiOni]
[27][advancednano?i=8U1cuI] [28][advancednano?i=Wvxoti]
[29][advancednano?i=zyRYmI]
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[35]Materialise a current leader in Rapid Manufacturing
[36]Rapid manufacturing was used to make important components of a
concept car. The Sintesi is a sports car with four doors and four
seats, developed by a highly innovative approach: it does not consider
the car as a shape that covers the mechanicals, but one that gives a
shape to the mechanicals around the passengers, starting from the
latter. (H/T to [37]Pantopicon.be)
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Materialise, a rapid manufacturing company, used additive technology
stereolithography (SLA): the radiator, control panels, roof antenna,
remote controller, roof light cover and most importantly, the
instrument panel which is the centrepiece of the car's interior.
During the file preparation phase, a complex webbing structure was
integrated in the dashboard to give it functional strength.
Pininfarina Sintesi stereolithography dashboard, Materialise uses
about [44]twelve different kinds of rapid manufacturing and rapid
prototyping systems. [45]Those systems can use a variety of materials.
The eventual panel was "printed" in its full width on a
[46]Materialise Mammoth SLA machine, with a build volume up to 2150 x
700 x 800 mm, in a translucent PP-like epoxy (Poly 1500).
Due to its complexity, also the radiator had to be manufactured by
means of additive technologies. The production of the smaller
components like the roof antenna and remote controller show the
endless personalisation possibilities of additive manufacturing.
Nowadays, the state of the art of additive technologies allows that
this type of products can be manufactured in small series of
production cars or one-offs. This is a big step forward towards real
personalised manufacturing.
[47]Mammoth Stereolithography has a build area of more than 2 meters
In order to build single-piece SLA models with dimensions of more than
2 meters, Materialise has developed a unique technology: mammoth
stereolithography.
Mammoth systems offer not only the ability to print very large parts,
but are also extremely fast and productive, thanks to a patented
curtain recoating technology which minimises the dead time between
layers. The mammoth parts are constructed layer by layer in a liquid
polymer that hardens when struck by a laser beam. The laser printed
layers are each time lowered together with the vessel's resin level.
Afterwards, a small reservoir moves over the vessel and disposes a
film of liquid polymer onto the whole vessel. This curtain recoating
technology needs less time between layers than the traditional SLA
technology which uses a scraper.
As a result of their unique combination of build size and speed,
mammoth systems are especially suited to high volume prototyping
operations requiring both large numbers of parts, and large parts.
FURTHER READING
Improved rapid manufacturing is one of the [48]seeds of a
manufacturing and construction revolution.
[49]This revolution will require rethinking designs and modelling and
other systems to fully realize its potential. Totally rethinking cars
is using [50]inflatable bodies for cars and then [51]using new paper
that is stronger than cast iron and epoxy to bring material costs
down.
The mammoth prototyping system could be used to make larger
ecomodifications to existing cars. [52]Aeromodding a car can increase
full economy on the highway by 50%. Less extreme modifications can
achieve 25% increases in fuel efficiency.
[53]Aerodynamic modifications for cars
- Lower the car - Lowering the car reduces the effective frontal area,
increasing efficiency. 2.7" ground clearance is a good minimum height.
According to Mercedes, "Lowering the ride height at speed results in a
3-percent improvement in drag."
- Remove that wing - Many "sports" cars have a non-functional wing on
the back. Removing it will improve the fuel economy. The exceptions
are the small rear fairings that are designed to detach the airflow
from a rounded trunk.
- Clean up the underside of the car. - Installation of a "body pan",
while a labor intensive operation, will provide a significant
improvement in mileage. More...
- If a body pan is not practical, an air dam will redirect air that
would normally pile up under the car causing drag. Not as good as a
body pan, but better than nothing. Should be combined with side
fairings.
- fair the wheel wells, racing disk wheel covers, and many other
modifications
[2145096038_d4bfa92e5a.jpg?v=0]
An extreme custom modification gets about 70mpg on highway from an old
Honda civic
[54]A discussion group for improving fuel efficiency.
[55][advancednano?i=BvV4T3]
[56][advancednano?i=CcwSOI] [57][advancednano?i=oiDciI]
[58][advancednano?i=8p9rQI] [59][advancednano?i=4J4cKi]
[60][advancednano?i=VXMI8i] [61][advancednano?i=KMBNdi]
[62][advancednano?i=IaM3LI] [63][advancednano?i=qweHLi]
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Wimax network
* [74]Carnival of Space Week 58
* [75]Iraq Oil production could increase by 400,000 bpd by the end
of 2008
* [76]United States might finally build a new oil refinery in 2013
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----- End forwarded message -----
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Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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