[tt] advanced nanotechnology - 6 new articles
Eugen Leitl
<eugen at leitl.org> on
Thu Sep 20 13:40:41 UTC 2007
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Subject: advanced nanotechnology - 6 new articles
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"[2]advanced nanotechnology" - 6 new articles
1. [3]Femtoseconds changes in reflexivity useful for optical
switching
2. [4]Trying to make the manufacturing chain more efficient
3. [5]Next generation USB vs next generation Firewire
4. [6]Challenge to Tim Harper's accusations and name calling
5. [7]Where is mechanosynthesis nanotechnology? In progress but
grossly underfunded [del.icio.us]
6. [8]Next Carnival of Space due
7. [9]More Recent Articles
8. [10]Search advanced nanotechnology
[11]Femtoseconds changes in reflexivity useful for optical switching
[12]In a recent experiment short laser pulses, falling on an organic
salt target, momentarily changed the material from an insulator (a bad
reflector of light) to a semi-metal (good reflector of light).
The change in reflectivity this large---more than 100%-has never
been achieved before in a photonic material; photo-induced changes
are usually more like a few percent. The laser pulse required
doesn't even have to be particularly intense to cause the change.
Thus gigantic photo-response work began as a Tokyo-Kyoto
collaboration but now includes also LBL and Oxford. The new advance
is that the change in reflectivity can be brought about in tens of
femtoseconds rather than 150 ns. The dramatic reflectivity changes
will be useful in bringing about direct ultrafast
optical-to-optical switching.
It could also be useful for faster optical computing.
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switching'
[26]Trying to make the manufacturing chain more efficient
[27]Ponoko is an attempt at an online network of people and companies
of the total manufacturing chain
Currently this version of the concept seems targeted at small
producers.
There are other attempts to leverage the internet to source components
and alternative suppliers.
hat tip to [28]futurismic
[29][advancednano?i=aGQzBRDr] [30][advancednano?i=XpYQiYUD]
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[42]Next generation USB vs next generation Firewire
[43]USB 3.0 could hit communication speeds of 4 Gbps and next
generation Firewire might be 3.2 Gbps or 10 Gbps USB2 has a speed of
480 mbps.
The USB3 spec probably will have to reduce the five-meter reach of USB
2.0, perhaps to as little as two meters.
The 1394 has been studying use of Firewire over distances as great as
100 meters on Category 5/6 cable and optical fibre, Snider noted. It
is also exploring versions for use in the home and car over coax
cables.
[44][advancednano?i=O3BOo1h1] [45][advancednano?i=U32sm9Q1]
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[57]Challenge to Tim Harper's accusations and name calling
[58]Tim Harper at cientifica has put up a name calling article with
accusations that those who believe in mechanosynthesis are ignoring
science
Here is his article:
The mechnosynthesis fans at places like the Centre for
Irresponisble Promotion of Unfeasble Nanotechnologies always get a
bit hot under the collar when criticised, and the first line of
attack is always to quote Lord Kelvin's famous 1882 remark that
"Heavier than air flying machines are impossible."
I am not convinced that this is a valid argument when looking at
molecular nanotechnology as we have had almost twenty years of
proponents saying that some kind of Utopian singularity is just
around the corner - surely this would be also worth quoting as an
example of a failed prediction?
Kelvin based his opinion on prevailing scientific opinion at the
time, whereas the Drexlerians ignore scientific opinion in the same
way that advocates of intelligent design and creationism ignore the
evidence of the fossil record. That probably explains why they are
given short shrift by the mainstream scientific community, and
resort to dismissing two and half thousand years of science for the
sake of a bunch of beliefs backed up with no evidence.
Perhaps this is a job for renowned sceptic and arch debunker
Richard Dawkins?
Here is my response:
1. What relevant specific science has been dismissed ?
2.Here is a link to theoretical and experimental work that supports
mechanosynthesis as a possible and promising approach
http://www.molecularassembler.com/Nanofactory/AnnBibDMS.htm
Also, molecular manufacturing is not and has not been only about
mechnosynthesis. There were papers by Drexler and others about
protein pathways and other means to achieve molecular
manufacturing. This information is publicly available from the
Foresight conferences and publications.
3. Certain predictions with dates attached may have been wrong.
Open ended predictions that X is impossible are wrong when X
happens regardless of when it is. A prediction that Y will happen
is not wrong after Z years if there was no time limit attached to
it. A Y prediction without date ranges and conditions like actual
effort being expended to achieve Y are not that useful.
4. If the mechanosynthesis view is so obviously flawed, then come
on Tim Harper, why do you need Richard Dawkins. Bring on your
specific issues and criticisms. I, Brian Wang, am calling you out.
Cite what it is that you believe are the "justifiable and worthy
scientific predictions or projects".
I think your name-calling is without proper basis and
justification. I think your accusation that science has been
dismissed is false. I think that the belief that molecular
manufacturing and mechanosynthesis is feasible has evidence.
I will return the name calling favor. I think that your site and
organization should be call UNscientifica.
I think that if you cannot back up your accusations and then do not
then retract them, that you are a useless name calling punk.
You call yourself one of the world's foremost experts on
commercialisation of technologies [on his profile at this website].
We can put that to the test. We can put up a public bet on whether
molecular manufacturing or mechanosynthesis of the type that you
criticize gets commercialized. Certainly something that the
"world's foremost expert" can handle.
Tim says the nanotechnology that CRN describes is unfeasible.
Unfeasible should mean that it never will happen. So Tim should feel
fairly comfortable looking at some minor milestones in the 30 to 50
year timeframes.
UPDATE:
Note: I am perfectly willing to be polite, but since Tim has initiated
the level of the discourse then he needed to get a taste of his own
abuse. I wonder why he got hot under the collar from my criticism ?
Tim replied to my comment of his posting via email. He claims he does
not want to publish "such histrionics" as were in my comment. My
interpretation is that he only publishes his own histrionics.
I say that this shows that he can dish out insults but cannot take it.
I say that this also shows that he is unwilling to defend what he
claims. He does not defend his own attacks against mechanosynthesis or
molecular manufacturing or his claim to be one of the world's foremost
experts on technological commercialization.
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[72]Where is mechanosynthesis nanotechnology? In progress but grossly
underfunded [del.icio.us]
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grossly underfunded [del.icio.us]'
[78]Next Carnival of Space due
For those who have a space article submit it to
CarnivalOfSpace at gmail.com
by Wednesday evening, 6:00 PM PST.
[79]Here are more details for sending a post.
[80][advancednano?i=YJOOJvc7] [81][advancednano?i=kBrqGJKQ]
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More Recent Articles
* [93]Where is mechanosynthesis? In progress but underfunded.
* [94]Reviewing some of my predictions on the Future
* [95]New phase change memory 1000 times faster than Flash memory
* [96]Tracking an interesting idea for cheap solar power
* [97]Towards Mitochondrial Repair
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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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