HDTenEightyP/NetNews huggingface dataset:
From: videen@cs.dal.ca (Gorden Videen)
Newsgroups: sci.optics
Subject: Re: Ref on Thermal IR Properties?
Keywords: Thermal infrared, properties of materials
Date: 5 Oct 92 13:18:12 GMT
Organization: Math, Stats & CS, Dalhousie University, Halifax, NS, Canada

There have been a number of requests for information on infrared/visible
properties of various materials.  My first reference book off the shelf
is "The Infrared Handbook" by Wolfe and Zissis.  More pages/$ than any
other book I've bought recently.  

-Gorden
From: jem21176@uxa.cso.uiuc.edu (Jon E. Meyer)
Newsgroups: sci.optics
Subject: Wanted: A fast galvonometer scanner for a laser. Where is it?
Date: 29 Sep 92 22:38:34 GMT
Article-I.D.: news.BvD2wB.Ft8
Organization: University of Illinois at Urbana

I am looking for a scanning system for a laser beam.  It needs
to be quick, I already have one that has a response of 120 Hz 
and would like to find one that's faster.  Where should I look?
Who should I call?  Mells-Griot?  MWK?

Jon Meyer
j-meyer10@uiuc.edu
From: hnr@ecs.soton.ac.uk (Harvey Rutt)
Newsgroups: sci.optics
Subject: Re: what do you know about IDS model ?
Date: 6 Oct 92 15:14:27 GMT

For the uninitiated, what **is** IDS!!??
Harvey Rutt Southampton UK
From: bj368@cleveland.Freenet.Edu (Mike E. Romano)
Newsgroups: sci.optics
Subject: Transparency of Glass vs Plastic
Date: 4 Oct 1992 09:21:12 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: hela.ins.cwru.edu


   I am doing a report for a biology class on the degree to
 which, and which part of the spectrum etc. , of solar
 rays are blocks by all the major forms of commercial
 glass panes as well as "clear" plastic.

 Any source material on this subject would be appreciated.
 I need to rank the types of glass etc. in terms of
 how much total rays are allowed through.
 Thanks.  Mike Romano    U Cal  Berkeley


-- 
Capt. Kirk: let's head for that planet, third from the sun, it
            looks promising.... |-)
Newsgroups: sci.optics
From: ts2@cec2.wustl.edu (Talha Siddiqui)
Subject: Commercial laser information needed.
Organization: Washington University, St. Louis MO
Date: Sat, 3 Oct 1992 22:37:58 GMT

I need some information on the type of laser that would be 
suitable for cutting various stones. The stones may vary from
marble (Onyx) to Granite. The reason that I need this infomation 
is that I want to manufacture a laser cutter whose application would
range from cutting large section of marble blocks from a quarry, to
finner cutting. What should be the power of such a laser and what 
kind of cooling system would it require. 

I am asking these questions (they may seem kind of amature) but I have
never used comercial scale lasers before and I am not even sure
if they could be applied to such a situation. 

Any and all help related to this would be appreciated. Also if
anyone is aware of the prices of such lasers and cooling systems 
and any other safety devices or any other equipment that would be 
required to operate such a laser I would appreciate it if you could
E-Mail this information to me. Thank you very much.

Omar.
Newsgroups: sci.optics
From: saeed@a.cs.okstate.edu (SAEED FAISEL)
Subject: what do you know about IDS model ?
Organization: Oklahoma State University, Computer Science, Stillwater
Date: Sun, 4 Oct 92 23:15:30 GMT

I need some info on the IDS model suggested by Cornsweet & Yellot.
And I want to start with a comprehensive bibliography on IDS.

Any email containing any pointers like any work done related to IDS,
specially any publications, etc will be appreciated.

I would also like to correspond with anyone currently working on it.


-- 

Faisel Saeed
Computer Science Department,   Oklahoma State University,   Stillwater, OK 
---------------------------------------------------------------------------
From: B521307@vmtecqro.qro.itesm.mx (Benjamin Millan Garcia)
Newsgroups: sci.optics
Subject: Need information about infrared cameras
Date: 1 Oct 92 03:52:20 GMT
Organization: Instituto Tecnologico de Monterrey, Campus Queretaro

Hello, one of my teachears wants to know about comercial infrared cameras,
to watch heat fluid from 200 to 1000 oC. If you can help me, i will thank
you.
 
b521307 at vmtecqro.qro.itesm.mx
Newsgroups: sci.optics
From: "glen mead" <glen.mead@canrem.com>
Subject: help! i need to modulate
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 2 Oct 92 18:50:33 EST

to: jem21176@uxa.cso.uiuc.edu (Jon E. Meyer)

Hi Jon,

-> I need to find a cheap laser diode in the visible spectrum that is
-> capable of modulating at video rates.   Where can I find one? MWK
-> doesn't have any.  Who should I talk to?  Can you help?

I'm sorry that I can't help you but I would appreciate it if you would
forward and replies you get since I am currently working on building a
laser device for a project.  How familiar are you with laser devices?  I
know what I have to work with but I'm not sure what's going to be
involved (I currently have a non-visible laser unit from a laser printer
which I would like to convert to a visible unit).  Any help would be
greatly appreciated.

Glen
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
From: mcn@cfa203.HARVARD.EDU (Charley Noecker, Prec Astron)
Newsgroups: sci.optics
Subject: Interferometry question
Date: 2 Oct 92 14:04:30 GMT
Organization: Smithsonian Astrophysical Observatory, Cambridge, MA,  USA

One of the rules we all know about Michelson interferometry is that
the recombined beams are E1+E2 and E1-E2.  It turns out this is a
consequence of energy conservation at the beamsplitter: for a lossless
beamsplitter, an increase in the intensity of one emerging beam must
be compensated by a decrease in the intensity of the other.  This rule
may be stated instead as a phase rule:
	theta_r1 + theta_r2 - theta_t1 - theta_t2 = pi
where the theta_* are the optical phase shifts imparted to the beams
upon reflection from or transmission through the beamsplitter surface.

That was for a lossless beamsplitter; I have also been able to show
that this phase rule still holds for a thin beamsplitter (reflecting
region << wavelength) with arbitrary absorption and glass path on
either side of this surface, as long as the distribution of glass and
absorber only depends on z, the normal to the surface.  Thus, although
|r1| may not be equal to |r2|, the phase rule still holds.  This just
means the absorption losses must vary in phase with one emerging beam
or the other.

I believe that this phase rule can be proved generally, without
requiring thin or lossless beamsplitters.  Can anyone steer me to a
proof or disproof?

Charley Noecker
noecker@cfa.harvard.edu
Newsgroups: sci.optics
From: ddm@hamby.tx.ncsu.edu (David Mann)
Subject: Source for small oval mirrors...
Organization: North Carolina State University
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 30 Sep 1992 00:10:11 GMT

Can anyone pass along a phone number for Edmund Scientific or another
company that carries small oval mirrors (3"x2" or so) for
experimentation.  Any help would be appreciated...

Dave

--
"The revolution will not be televised"
                              -- Nat X
David_Mann@ncsu.edu
From: dpletche@jarthur.claremont.edu (David Pletcher)
Subject: Re: Epson's LCTV as SLM
Organization: Harvey Mudd College, Claremont, CA 91711
Date: Thu, 1 Oct 1992 21:58:24 GMT

In article <1992Sep23.162842.25927@cerberus.ulaval.ca> gagne@fourier.phy.ulaval.ca (Philippe Gagne) writes:
>
>We would like to buy a video
>projector from Epson (the Crystal Image Video Projector), to use its LCD
>as SLM.
>
>   The problem is that we (and Epson Canada) don't know where we can buy it.

They've taken it off the market for the time being.  They are supposed
to come out with a new 640x400 version sometime "soon".  Your chances
of getting one right now aren't great, but here is the address from
the front of the service manual if you would like to try it:

Epson America, Inc.
Marketing Department
2780 Lomita Boulevard
Torrance, California 90505

Good Luck,
David Pletcher
Newsgroups: sci.optics
From: ron@vicorp.com (Ron Peterson)
Subject: Re: Epson's LCTV as SLM
Organization: V. I. Corporation, Northampton, Massachusetts
Date: Fri, 2 Oct 1992 21:20:34 GMT

In article <1992Oct1.215824.6300@muddcs.claremont.edu> dpletche@jarthur.claremont.edu (David Pletcher) writes:
>In article <1992Sep23.162842.25927@cerberus.ulaval.ca> gagne@fourier.phy.ulaval.ca (Philippe Gagne) writes:
>>
>>We would like to buy a video
>>projector from Epson (the Crystal Image Video Projector), to use its LCD
>>as SLM.
>>   The problem is that we (and Epson Canada) don't know where we can buy it.
>
>They've taken it off the market for the time being.  They are supposed
>to come out with a new 640x400 version sometime "soon".  Your chances

The Damark catalog I received yesterday offers an inexpensive LCD 
projection tv ($500 I think).  Might be the same model described above.
Maybe they have some in stock.  Email me if you need the phone # for them.
ron@vicorp.com or uunet!vicorp!ron
Newsgroups: sci.optics
From: bosch@watson.ibm.com (bosch@quest.watson.ibm.com)
Subject: Optical Simulator Software
Date: Mon, 05 Oct 92 17:23:31 GMT
Organization: IBM T.J. Watson Research Center

Does anybody out there know about any software packages for simulation of 
geometric (ray) optics and wave optics ? I am in particular interested in 
software that is in the public domain and available with the sources, but
any pointers to both academic and commercial packages will be appreciated.

Cheers, Bengt-Olaf.
From: ebstokes@maxwell.crd.ge.com (Ed Stokes)
Newsgroups: sci.optics
Subject: laser rental ?
Date: 30 Sep 92 13:23:55 GMT
Organization: GE Corp. Research & Development, Schenectady, NY

Is anyone aware of any companies that rent lasers ? Specifically,
we need a small, air-cooled Ar laser for about a month...

Ed Stokes
ebstokes@crd.ge.com
From: centry@athena.mit.edu (Jae H Nam)
Newsgroups: sci.nanotech
Subject: Re: Any advances in STM's?
Date: 6 Oct 92 22:32:20 GMT
Organization: Massachusetts Institute of Technology


Could you tell me about some of the experiments done with STM's?  I'm
pretty backdated on the current trends.  Last thing I heard was about
an experiment where they manipulated silicon with an STM (I think).

[Any STM users out there?  --JoSH]
From: merkle@parc.xerox.com (Ralph Merkle)
Newsgroups: sci.nanotech
Subject: Nanotechnology Journal
Date: 28 Sep 92 00:52:29 GMT

The quarterly technical journal "Nanotechnology" will have a special
issue on the Second Foresight Conference on Molecular Nanotechnology
that was held last year near Stanford.

The following information is taken directly from the April 1991 issue:

"Nanotechnology" is an international multidisciplinary journal
publishing research papers aimed at promoting the dissemination
of research and improving understanding of nanometre [sic] scale
phenomena among the engineering, fabrication, optics, electronics,
materials sciences, biological and medical communities.  It is
hoped that the existence of this forum for the discussion and
communication of new research will clarify our vision of
miniaturisation as a scientific endeavour and help to convert
our vision of the future into a reality -- today.

Published by IOP Publishing Ltd.
Techno House, Redcliffe Way
Bristol BS1 6NX, UK

Subscription information
Volume 2 (4 issues), 1991, 120.00 pounds
(US$215.00)
Single-issue price:  30.00 pounds

All orders other than for the United States,
Canada and Mexico should be sent to:

Order Processing Department
IOP Publishing Ltd.
Techno House
Redcliffe Way
Bristol BS1 6NX
UK

For the United States, Canada and Mexico, all
orders should be sent to:

American Institute of Physics
Subscriber Services
500 Sunnyside Boulevard
Woodbury, NY 11797-2999
USA

Anyone with technical contributions in the area of nanotechnology is
encouraged to consider "Nanotechnology" as the appropriate place to
publish.

Anyone interested in following the technical development of this field
is encouraged to subscribe.

At the present time many of the articles are really about nano-scale
technologies, rather than molecular nanotechnology as it is discussed
here.  However, I think this will change, particularly if we all
subscribe and contribute articles....
From: tomk@netcom.com (Thomas H. Kunich)
Newsgroups: sci.nanotech
Subject: Re: Inheritance of acquired characteristics
Date: 6 Oct 92 22:43:32 GMT
Organization: Netcom - Online Communication Services (408 241-9760 guest)

In article <Sep.25.17.03.26.1992.22764@planchet.rutgers.edu> efi!chrisp@uunet.uu.net (Chris Phoenix) writes:
>
>I'll go *way* out on a limb and give an example from biology.  I
>assume that protein folding is not a direct function of DNA--a complex
>protein may have two states with enough of a potential barrier between
>them that it will stay in whichever shape it is folded into.  Given
>that assumption, imagine that a ribosome for some reason folds into a
>less compact shape than normal.  This is the "change".  This new shape
>just might prevent proteins from folding like they used to, and the
>effect would be seen more on bigger proteins--like ribosomes.  So it
>seems possible that this change could be inherited in new generations
>of ribosomes manufactured by the original changed ribosome.  But
>certainly cells are not "designed" to inherit such changes.

Consider this Chris: proteins may have multiple stable folds even
though a certain configuration is favored. Then, once every umpteen
million years, purely by statistical probability, this protein will
fold in a different manner because of some passing energy influence
of some sort. This means that very complex machines can _never_
be tested for complete reliability and you can never say with complete
confidence that there isn't a 'bug' in the system.

(It is my belief that this will turn out to be a major part of
the AIDS problem. Perhaps the surface antigens change to a configuration
that causes an autoimmune reaction. Since the configuration is both
odd and unlikely it requires some long period of time to occur.)

As a hardware problem consider the present state of the art of programmable
logic. These gate arrays and whatnot are becoming so complex that it isn't
possible to test them either completely or to a very large4 confidence
level in a reasonable amount of time. So there are all sorts of theories
out there about how to develop test procedures that give the best
possible tests in the most effective amount of time. But anyone that
works with programmable logic will tell you that they know very little
abou these devices reaction to unknown/untested inputs.

But, SUPRISE, we are going to completely solve all of these problems in
order to develop nanotechnology.

As I said before, most of these problems could be solved to some level
of probability, but unless there are specific targets of nanotechnology
where they can compete against the many other technologies, there will
never be the economic incentive to try.

[There's no such thing as 100% reliability in any system, and it's a
 bit of a strawman to point out that that's still true with nanotech.
 --JoSH]
From: ian@inf.ethz.ch (Ian)
Newsgroups: sci.nanotech
Subject: Re: More evolution
Date: 29 Sep 92 03:33:44 GMT
Organization: Dept. Informatik, Swiss Federal Institute of Technology (ETH)

In article <Sep.27.20.54.52.1992.20045@planchet.rutgers.edu> szabo@techbook.com (Nick Szabo) writes:

>> (Me)
>>(I recently tried to persuade my one of Professors against trying 
>>to reconstruct a proto-yeast organism for exactly this reason).

>This is interesting.  How long has it been extinct, and how close
>are they to reanimating it?  Is it being done by reconstruction
>or by reanimating preserved DNA?


Not very close at all, this was a very long term project we were discussing.
If you are interested I can tell you who to approach (with money, post-docs,
equipment :-).

It's been extinct for a very looooooong time, can't say exactly but it
was to be reconstructed by deduction of ancestral sequence from all know
descendants, this makes the organism being rebuilt an approximation of the
last common ancestor of all contemorary yeasts.


>Approaching it from the direction of flexible manufacturing:
>how much of a 3D printer might be printed by a 3D printer?
>Could it print out a robot that in turn could assemble the 3D 
>printer and another robot?  

Since, I expect a 3D printer to have a relatively low error tolerance (correct
me), it would make more sense to print machine-tool parts and a robot to
to assemble the machine-tool.  Then have the machine tool make the new copiers.
This way the copiers error-tolerance manifests in the machine-tool and can be
(part) compensated by clever software so less error is transmitted to the new
copier (ie is inherited).

>Tuesday  ^^ Libertarian  --  change  **  choice && November 3rd @@Libertarian 
             ^^^^^^^^^^^
<< Aside, I'm English and therefore ignorant (:-), what does this mean ? >>

[It's a political party.  However, political discussion is forbidden on
 sci.nanotech.  Ian, could you provide a return address that works
 so that people could discuss these things by mail?  I can't get through
 to you myself... --JoSH]
From: willdye@helios.unl.edu (Will Dye)
Newsgroups: sci.nanotech
Subject: Re: grad school suggestions?
Date: 29 Sep 92 03:46:15 GMT
Organization: University of Nebraska - Lincoln

tripstr@ucscb.ucsc.edu (Christopher Todd Courtois) writes:

>	Can anyone point me to which American grad schools are
>	on the cutting edge of nanotech and yet not too snobbish
>	to accept an average-yet-higly-motivated student such 
>	as I? 

I'd like to echo that.  I've recently graduated with a B.A. in 
Multimedia Computing (it's a long story).  I want to eventually 
get a Ph.D. in nanotechnology, and use my career in the meantime 
to help make full nanotech a reality.  Any suggestions on good 
locales?  Much of the work seems to be on the West Coast, but I 
have stong ties to Nebraska and Colorado.
From: szabo@techbook.com (Nick Szabo)
Newsgroups: sci.nanotech
Subject: Re: More evolution
Date: 28 Sep 92 00:54:53 GMT
Organization: TECHbooks --- Public Access UNIX --- (503) 220-0636

In article <Sep.25.16.52.58.1992.22583@planchet.rutgers.edu> ian@inf.ethz.ch (Ian) writes:
>(I recently tried to persuade my one of Professors against trying 
>to reconstruct a proto-yeast organism for exactly this reason).

This is interesting.  How long has it been extinct, and how close
are they to reanimating it?  Is it being done by reconstruction
or by reanimating preserved DNA?

>...(One simple answer is 
>that  there will never be a 'low-tech' replicator as  replication 
>is an inherently 'high-tech' procedure; does anybody  (dis)agree 
>with this ?)

Depends; all sorts of things self-replicate, eg polymers, crystals,
and nuclear chain-reactions.  Inspired by the Play-Doh "Fun Factory",
I've designed a structure that can extrude copies of itself (but a human
still has to put in the clay and push down, and put the parts together).
We're looking for something that combines replication with flexible 
manufacturing, and can assemble itself.  Life seems to be the best we've 
found, but it's only explored a small part of the search space, so we should 
be able to do much better.  Anything that both replicates, flexible
manufactures, and assembles would likely be hi-tech.

Approaching it from the direction of flexible manufacturing:
how much of a 3D printer might be printed by a 3D printer?
Could it print out a robot that in turn could assemble the 3D 
printer and another robot?  


-- 
szabo@techbook.COM  	  Tuesday, November third  ##  Libertarian  $$  vote
Tuesday  ^^ Libertarian  --  change  **  choice && November 3rd @@Libertarian
From: Alexandra_Haropulos.ADFMcLean_CSD@xerox.com
Newsgroups: sci.nanotech
Subject: Re: Eliminating the need to sleep?
Date: 29 Sep 92 03:40:11 GMT

<It occurred to me that sleep is a terrible waste of time for human
beings.  Imagine the productivity and leisure increase that would be
possible if the need for sleep can be drastically reduced or
eliminated.

Does anybody have any idea of the current state of research in this
area?  What about wild speculations?>

I have read a bit into the literature of sleep research. Although most of the
research tends to be fairly pragmatic, in that it focuses on approaches to
curing sleep dysfunction, two interesting points have appeared:

Some folks really don't need much sleep. There are cases where people function
normally on two or three hours, or even, in one case, 45 minutes of sleep a
night. There are some indications that these people have unusual brain wave
patterns while awake, and that they drop faster through the alpha state than
most sleepers.

One book I read some years ago, which is likely hopelessly out of date now,
suggested that sleep is induced by some one of the micro-dose endocryns, and
that the purpose of sleep is to permit you to integrate your short-term
memories with your long-term ones in permanent storage via dreaming. He cites
the role that the hippocampus plays in dreaming (or its absence in the absence
of dreaming), the apparent fact that it takes about three days for short term
memory to integrate into long (the period of time in which images from your
present seem to be most vivid in dreams), that people with sleep disfunction
have memory disfunction, and a number of other highly suggestive experimental
data that would indicate that sleep is not primarily for the purpose of bodily
but of mental restoration.

But, if some folks can do it, others could too, with practice or medication. I
guess the next question is, why would we really want to? I don't know about
anyone else, but I need some high grade personal time during the day, and with
career and home responsibilities, it is getting to the point where sleep is the
only personal time I have. Is our infrastructure such that we could support the
activities that would go with additional waking time? Right now, for example,
some cities only allow freight trucks into the central streets during the "off
hours". What happens when you run out of off hours? And what do we do when the
margin for expansion of usable time in emergencies goes away?

I guess it depends if you think that sleep is actually a waste. Some mystics
suggest that dreaming may be more the "real us" than our awake time....

Alex H.
From: ewstroup@cc.utah.edu (ERIC W. STROUP)
Newsgroups: sci.nanotech
Subject: Re: Any advances in STM's?
Date: 6 Oct 92 22:35:12 GMT
Organization: University of Utah Computer Center

In article <Sep.28.23.45.57.1992.3400@planchet.rutgers.edu>, centry@athena.mit.edu (Jae H Nam) writes...
{Just wondering about what advances there have been
{in STM's with regards to nanotechnology.
{ 
{Thanks.
{ 
{[Since when?  A lot of interesting proto-manipulator proposals have
{ been advanced, and various experiments done, and more all the time.
{ --JoSH]


Look at recent issues of J of Vac Sci Tech for the issues that have the 
scanning probe conferences and their proceedings.  Else look in Ultramicroscopy
for the proceedings from STM '92.

-Eric
ewstroup@cc.utah.edu