HDTenEightyP/NetNews huggingface dataset:
From: smp@cathedral.cerc.wvu.wvnet.edu (Shailesh M. Potnis)
Newsgroups: sci.chem
Subject: request for references to papers on computer aided chemistry
Date: 6 Apr 92 12:47:57 GMT


	I would like to know the state of the art research in computer
applications in various fields of chemistry such as molecular modeling,
spectroscopy, organic synthesis and structure recognition. I am therefore 
interested in recent research articles/reviews on this subjects.

	All comments and suggestions are highly appreciated.


	Thanks in advance

--
Shailesh Potnis.			|The good that you do today will
Research Associate.			|be forgotten tomorrow.
Concurrent Engineering Research		|DO GOOD ANYWAY.
Center, West Virginia University.	|
From: brockus@usc.edu (Jeffrey Brockus)
Newsgroups: sci.chem
Subject: Buckminsterfuller (spelling?) Molecule?
Date: 11 Apr 1992 21:00:04 -0700
Organization: University of Southern California, Los Angeles, CA
Distribution: na
NNTP-Posting-Host: sal-sun34.usc.edu



Does anyone know as to why this Buckminster molecule is so important?
Is it because of its shape or its properties?



Jeffrey Brockus
brockus@usc.edu
From: mmm@cup.portal.com (Mark Robert Thorson)
Newsgroups: sci.chem
Subject: Re: High vacuum questions
Date: Fri, 10 Apr 92 22:19:51 PDT
Organization: The Portal System (TM)

High vacuum is generally obtained from a 2-stage system.  The pump which
vents to the atmosphere is called a forepump, and usually is a vane-type
mechanical pump.  Inside, it has a rotor with two sliding spring-loaded
graphite vanes rotating inside a cylindrical chamber which works (like
a previous poster said) like a Mazda rotary engine running in reverse.
The other common forepump is an oscillating piston type.

The forepump provides low pressure to the exhaust of a backing pump,
usually in the range of 0.1 to 0.01 torr.  The backing pump then takes
you to high vacuum.  As the previous poster decribed, the most common
backing pump is known variously as the oil-diffusion, oil-injector,
or oil-booster pump.  These often look like a big vase, wrapped in
cooling coils.

For very high vacua, an adsorption pump which traps gas by sputtering
or evaporating metal onto the interior of a chamber is often used.
These pumps have little pumping capacity, but reach high vacua.  To
go to even higher vacua, cooled zeolites or activated charcoal can be
used to absorb additional gas (of course, it has to vacuum-baked first).

For high pumping rates, Roots blowers or spiral compressors are used.
These are rotors of metal, usually 1 to 4 feet long.  In a Roots
blower, both rotors have a figure-8 cross-section.  The rotate very
close together, with the lobe of one rotor seating into the valley
of the other rotor.  Gas is trapped by the rotors on one side, and
expelled on the other side.  These are nice pumps because they both
have high capacity and they are very tolerant of ingesting moisture
and vapors.  They can be stacked up, to achieve reasonable vacua
(high vacua from the standpoint of a chemist or metallurgist, low
vacua for a physicist).  They are commonly used in large operations,
like vacuum refinement of metals on an industrial scale.

Another interesting pump is the Gaede molecular drag pump, which
consists of a disc rotating at high speed within a very close
tolerance scroll case.  Typical disc size is 12 inches, rotation
speed 10,000 RPM.  Viscous drag and centrifugal force transfer gas
from the center of the scroll case to the outer perimeter, where it
gets sucked up by the forepump.
Newsgroups: sci.chem
Subject: Re: Re: LCD lifespan
From: srgxbhh@grace.dsir.govt.nz
Date: 17 Apr 92 07:38:11 +1200
Organization: DSIR, Gracefield, New Zealand

In article <75980001@hpldsla.sid.hp.com>, ssouth@hpldsla.sid.hp.com (Steve South) writes:
> Hmmm,
> 
> It's a long time ago, but I used to work in the analytical department of
> a British company that was at one time the worlds largest supplier of
> liquid crystal materials.

[ some informative text deleted ]
 
> I did the gas-chromatographic analysis of the LC's (this was before capillary
> columns were widespread) with a Pye 104, FID and a Kent Chromalog 'Integrator'.
> This hideous thing had vacuum tubes and you had to manually start and stop it
> at the beginning and end of each peak. The column I used was a 5' 3% OV225
> on GasChrom Q (God, it seems like yesterday!) and with a maximum operating
> temperature of about 250C there were some long retention times. In particular,
> for the highest MW material, the main product had a retention time of about
> 10 minutes, and the amide had an RT of something like an hour. So I would
> be there to integrate the first peaks, go for lunch, and then come back to 
> integrate the amide peak (if any). Trouble was, I didn't always get back from
> lunch in time.....
> 
> If only they hadn't been such a bunch of cheapskates they would have bought
> decent HP GC's and integrators :-)
> 
> So, (after the irrelevancies above) I can't give you any real numbers for
> LCD lifetimes, but provided the electrical rules are applied you shouldn't
> have much of a problem.
> 
> To the chemists out there, my apologies for any technical/spelling errors. It
> was a long time ago.
> 
> Steve South.
> ------------
> 
> ObChem: Old chromatographers never die - they just enter a stationary phase.

Well nor do old Chromatographs - we still use 2 Pye 104s!. You were lucky   -
I originally had to cut and weigh recorder chart paper. Of course both
the Pyes have HP3390a integrators, and we have 4 HP capillary GCs with
either HP 3392a or HP3365 Chemstation. Which brings me to a question, does
any have access to the HP Chemstation free post-run user contributed software
library? - I'm interested in some of the programmes that matransfer and 
manipulate data in Excel. 

      Bruce Hamilton        SRGXBHH@grv.dsir.govt.nz
From: cjs1722@zeus.tamu.edu (STEPANIAN, CHRISTOPHER JOHN)
Newsgroups: sci.materials
Subject: re: re: carbon fiber bows
Date: 10 Apr 92 03:57:00 GMT
Organization: Texas A&M University, Academic Computing Services
News-Software: VAX/VMS VNEWS 1.41

>>The way we knew it at Hercules was that carbon fibers only had to go 
>>through one 'low temp' furnace while the graphite fibers had to go
>>through both the 'high and low temp' furnaces. The majority of the 

>The difference is in the purity of the carbon content.  There is a
>higher concentration of "real" graphite in the graphite fibers.  Fibers
>are now being made from pitch bases and have high carbon contents, as
>can be seen by the densities (2.1 g/cc for pitch based, versus 1.8 for
>polyarcylonitrile (PAN))

Very true! The higher temp furnace burned off the 'extras' leaving
a higher elemental carbon content. Based on what Agarwal says, 
carbon fibers are at 80-95% carbon while graphite fibers come in 
at +99%. Its a heck of an effort to get that extra couple of percent
but when you want stiffness, its worth it.

>>If I was to design a bow, I would determine what a user wants from
>>the device (a certain shape, an energy distribution, etc...). Then
>>I'd sit down with a flat plate analysis program (a fairly close
>>analogy to the bow) and get the curvatures or stresses that you want
>>for your ideal bow. Materials, thicknesses, and ply orientations can
>>be chosen at this point... Kinda vague?  I know, but I really don't 
>>know what makes a bow good?!

>This approach is acceptable, but not ideal.  If you start with plate
>analysis, you are assuming homogeneous isotropic material.  Consequently
>you will probably end up with a relatively isotropic lay-up.  The actual
>design process (currently) is going to iterative, and not necessarily
>coming up with a true optimum, just a local one.

Assuming a lack of expertise on the analyzer's part, this would give 
them a result that would get them in the ballpark. There are a number
of programs on the market that will walk you thru the numbers/concepts like
MicMac and PC-LAM... You are correct as to the iterative nature of
the problem; it is like designing a ski to yield a constant
radius of curvature under all loads. 

>Becareful about your starting point for design iteration.

>Also, strongly consider braiding processes for tubular like structures
>(such as the bow.)

Braiding would be especially good for a proto bow with a small
factor of safety (or a new and doubtful design). It could keep splinters
from your hands if it blows.

I still have some questions though as to what the 'carbon foam' 
actually is, Rhoacell(sp?) with GR/EP face sheets perhaps? Finite 
element analysis would be good way of finishing the bow design (if available).

Good Luck!



----------------------------------------------------------------
Chris Stepanian			| "Its my wife, and its my life"
Dept of Ocean Engineering	|
Texas A&M University		|     Lou Reed/Velvet Undergound
CJS1722@ZEUS.TAMU.EDU		|
----------------------------------------------------------------
From: swami@chtm.eece.unm.edu (Swami srinivasan)
Newsgroups: sci.materials
Subject: Why do Fullerenes form in MBE?
Date: 9 Apr 92 00:10:34 GMT
Article-I.D.: lynx.phrjz0#
Organization: University of New Mexico, Albuquerque


	have a nagging question...

	Recently someone from Arizona (Hoffman's (?) group) came over
to UNM to talk about fullerenes. He was once a grad student studying 
inter-galactic clouds or something like that, when Fullerenes were
discovered.

	He mentioned that fullerenes can also be made by MBE growth.
Being a compound semiconductors person, i am used to the concept of
MBE being used to grow thin films/superlattices, etc. Except for 
some 3-D defects, the growth usually is uniform across the wafer (at 
that's what we try to do most of the time).

	How does a fullerene form? i would have expected a flat
thin film of C to deposit. What makes the few atoms that first contact
the substrate to grow upward, with the "prior" knowledge of  C-60
geometry? How does the structure actually grow and under what special
conditions (in an MBE)? Can these be grown with MOCVD?

	More generally, how do fullerenes form at all? There must be
some particular feature about the bonding in this structure, that
justifies the Carbon atoms forming the elaborate sphere. If i am
correct, an ordered structure like that must entail lower entropy
than just amorphous C; i.e., there must be energy put in during its
formation to make it a preferred structure. So why does it happen?

	I hope these aren't silly questions. Any info/references will
be welcome. i am curious about the topic and slowly getting interested,
anticipating some non-linear optics applications. 

							swami srinivasan
=======================================================================
swaminathan srinivasan
center for high tech materials
univ. of new mexico, albuquerque		cogito ergo sum

swami@chtm.eece.unm.edu
=======================================================================
Xref: sparky sci.materials:222 sci.engr:1148
From: monwel@cbnewsk.cb.att.com (douglas.w.monroe)
Newsgroups: sci.materials,sci.engr
Subject: Electro-Rheological materials??
Keywords: flow, electric field, clutches
Date: 8 Apr 92 13:44:53 GMT
Followup-To: poster
Distribution: usa
Organization: AT&T


Hi there! A long time back, I recall reading about a material(s?) which change
from solid to liquid-like upon application of voltage. I believe this was used in
a clutch or braking application. If I remember correctly, the material was
refered to as an electro-rheological fluid. Anyone have any details about
these materials and whether they are commercially available? Please e-mail,
I'll sumarize if there's enough interest.

Thanks!
-- 
******************************************************************************
                                                          Doug Monroe
                   				       dwm@pruxl.att.com
  						 -or-  monwel@cbnewsk.att.com
Newsgroups: sci.materials
From: emf@creek.ugrad.ee.ufl.edu (Ed Filangeri)
Subject: Spreading Resistance Question
Organization: UF EE Department
Date: Thu, 9 Apr 92 16:26:19 GMT

Does anyone out there know how to model probe noise on a two-probe spreading resistance measurement system?  As far as I know, this issue has not had adequate attention.

Please reply.
Newsgroups: sci.materials,rec.autos,rec.autos.tech
From: hkon@athena.mit.edu (Henry Kon)
Subject: Material Science for my Windshield
Summary: Fractured windshield - trying to stop the spread of a crack
Keywords: broken windshield glass
Organization: Massachusetts Institute of Technology
Distribution: na
Date: Fri, 10 Apr 1992 19:05:30 GMT

ANY HELP SOUGHT !!!!
I have a hairline fracture in my windshield.  It is small, but growing. 
Someone told me that they heard of putting some kind of glue a the growth
end.  I don't kow what kind of glue to use !!

I assume it should be (1) rigid like glass, (2) adherent to glass, and (3) 
similar to glass in terms of change due to temperature variations.

Any and all ideas appreciated.  Is glue the right idea ?

Signed - Watching the Creep Flourish in Somerville, Mass.




--
Henry Kon
617-253-2781
hkon@athena
From: zaval@athena.mit.edu (Antonis)
Newsgroups: sci.materials,sci.eng
Subject: Looking for a book with problems on composites
Date: 14 Apr 92 01:02:28 GMT
Article-I.D.: athena.1992Apr14.010228.13990
Organization: Massachusetts Institute of Technology


Any suggestions on books with problems (solved or not) on the
mechanical behavior of composites?


Antonis
From: tmiyazak@etl.go.jp (Takehide Miyazaki)
Newsgroups: sci.materials
Subject: references wanted
Date: 15 Apr 92 13:13:28 GMT
Organization: Electrotechnical Laboratory, Tsukuba Science City


     Dear networkers,

   I would like recent references on As or Ga terminated Si(111) or
Si(001) surfaces. 

   Please give me any information.

     Thank you very much in advance.
 
                  Takehide Miyazaki, Electrotechnical Lab.

                  e-mail : tmiyazak@etl.go.jp    
Xref: sparky sci.materials:236 sci.optics:489
From: robinsmm@ucsu.Colorado.EDU (ROBINSON MARYBETH)
Newsgroups: sci.materials,sci.optics
Subject: Re: What's the max. luminescence efficiency in Si (porous)?
Date: 10 Apr 92 17:21:19 GMT
Organization: University of Colorado, Boulder

In article <qhsj0+c@lynx.unm.edu> swami@chtm.eece.unm.edu (Swami srinivasan) writes:
>have yetanudder question...
>
>	What is the max. (optically pumped) luminescence efficiency
>achieved in porous Silicon so far? Last i heard (a couple o' months
>ago) it was about 1%. 
>
>	There was quite a lot of excitement last fall, hope it hasn't
>died down. Also heard of a result from Munich - they observed 
>electroluminescence, but strangely, there was light emission with
>both biases! 
>
>	Wonder if there are any explanations for this phenomenon.
>
>						               swami 
>=======================================================================
>swaminathan srinivasan
>swami@chtm.eece.unm.edu				chumma, like!
>=======================================================================

I am not sure what the latest reported max efficiency for PL Porous Si
is, but I can assure you that the excitement from last fall
has not died down any.  I would,in fact, like to see this topic
discussed more on this bboard.

I am currently working with Steven George at University of Colorado,
Boulder, studying correlations of surface chemistry (studied via
transmission FTIR) with photoluminescence properties.  Our work thus far
(as presented at the fall MRS meeting in Boston) has centered on
correlating hydrogen coverage, and thermal annealing with PL.  

I would be very interested in hearing from other people on the net who
are studying porous silicon.  I enjoyed the lively debates at the MRS
and would like to see them continue here!


MB



-- 
MaryBeth (MB) Robinson    		robinsmm@ucsu.Colorado.edu
Department of Chemistry
University of Colorado
Newsgroups: sci.materials,sci.chem
From: tyadav@athena.mit.edu (Tapesh Yadav)
Subject: Need info on conferences/meetings in Japan
Organization: Massachusetts Institute of Technology
Date: Fri, 10 Apr 1992 00:06:05 GMT

=====================

 Specific question: 

   I need sources/leads on conferences/meetings in Japan on materials.
   Preferrably fullerene related. 
   I need this info to plan a trip to Japan. 

 General question: Other than journals, where else can one efficiently
                   find conference/meetings related information?

T.Y.
----
tyadav@athena.mit.edu

Xref: sparky sci.materials:233 sci.optics:487
From: swami@chtm.eece.unm.edu (Swami srinivasan)
Newsgroups: sci.materials,sci.optics
Subject: What's the max. luminescence efficiency in Si (porous)?
Date: 10 Apr 92 00:15:45 GMT
Article-I.D.: lynx.qhsj0+c
Organization: University of New Mexico, Albuquerque

have yetanudder question...

	What is the max. (optically pumped) luminescence efficiency
achieved in porous Silicon so far? Last i heard (a couple o' months
ago) it was about 1%. 

	There was quite a lot of excitement last fall, hope it hasn't
died down. Also heard of a result from Munich - they observed 
electroluminescence, but strangely, there was light emission with
both biases! 

	Wonder if there are any explanations for this phenomenon.

						               swami 
=======================================================================
swaminathan srinivasan
center for high tech materials	      "If you don't care where you are,
eece, univ. of new mexico		then you aren't lost."

swami@chtm.eece.unm.edu				chumma, like!
=======================================================================
Xref: sparky sci.materials:238 sci.chem:1893
From: rwk@crl.dec.com (Bob Kerns)
Newsgroups: sci.materials,sci.chem
Subject: Re: Need info on conferences/meetings in Japan
Date: 10 Apr 92 18:27:11 GMT
Organization: Cambridge Research Lab, Digital Equipment Corp.

In article <1992Apr10.000605.22535@athena.mit.edu> tyadav@athena.mit.edu (Tapesh Yadav) writes:

   From: tyadav@athena.mit.edu (Tapesh Yadav)
   Date: 10 Apr 92 00:06:05 GMT
   =====================

    Specific question: 

      I need sources/leads on conferences/meetings in Japan on materials.
      Preferrably fullerene related. 
      I need this info to plan a trip to Japan. 

    General question: Other than journals, where else can one efficiently
		      find conference/meetings related information?

Assuming you can read Japanese, you could try the newsgroups fj.sci.chem
and fj.meetings.  I did a little poking around, and I didn't find
conferences at the moment on materials, but in fj.sci.chem there's
a number of articles on buckystuff.

I'm not certain of the etiquette, but I think it might be OK to
post a short note in english to fj.sci.chem asking for information.
Newsgroups: sci.materials
From: locher@IASTATE.EDU (Robert C Locher)
Subject: dynamic atom visualization program
Reply-To: locher@IASTATE.EDU (Robert C Locher)
Organization: Iowa State University
Date: Fri, 10 Apr 1992 04:07:00 GMT


Hi!

I'm a researcher at Iowa State University, specializing in molecular dynamics 
simulations of inorganic glasses.

I was wondering if anyone out there could possibly point me towards a program 
which could dynamically display an isometric-type view of an assembly of, say,
200 or so atoms.  The position data is stored in a file, not generated
dynamically.  The program must be for X and Unix.

Thanks for your time!

                                - Rob

P.S.  E-mail me, and if there is much response, I will summarize to the net.
From: pollack@ucunix.san.uc.edu (Steven Pollack)
Newsgroups: sci.materials
Subject: Can of Worms revisited
Date: 11 Apr 92 16:31:17 GMT
Organization: University of Cincinnati

As expected everybody flamed me on this one.  I should have phrased this
one differently.  Most MS&E Departments have evolved from Metallurgy
Programs.  As such, the general trend has been to take a bandaid
approach in adding in the necessary topics relevent to the polymers and
ceramics that would fall under the same catagories as those taught in
the traditional Physical Metallurgy class.  We have a pair of courses
entitled Science of Materials I & II and they are of this ilk. I am, as
a polymer scientist, trying to assess what should be taught it this sort
of course that crosses the three subdisciplines.  I am in no way
advocating that we drop Phys. Met. from the MS&E curriculum.  I am
looking for a less specific introductory class for the three
subdisciplines that is a a level higher than a general engineering
introduction to materials (al'a van Vlack/Smith/Callister etc.).  

So....  

Topics?
Textbooks?


_______________________________________________________________________
Steven K. Pollack               |
University of Cincinnati        |
Department of Materials Science |   I notice that you are still
  & Engineering                 |   using polymers!
498 Rhodes Hall  ML#12          |     - Lt. Commander Montgomery Scott
Cincinnati, OH 45221-0012       |       U.S.S. Enterprise
pollack@ester.mse.uc.edu        |
________________________________________________________________________
Xref: sparky sci.materials:263 sci.chem:1920
Newsgroups: sci.materials,sci.chem
Subject: Materials anonymous FTP site
From: pollack@ucunix.san.uc.edu (Steven Pollack)
Date: Wed, 15 Apr 92 01:38:27 GMT
Organization: University of Cincinnati

Sorry about confusion to those who tried to reach me, but my addresses
are

	spollack@ester.mse.uc.edu
	pollack@ucunix.san.uc.edu
	steve.pollack@uc.edu

All end up on ester.

I have set up an anonymous FTP on my system.  It is reserved for
software (codes or data) for those in the broad area of materials
science (polymer, metals, ceramics, electronic materials, composites).
Please deposit your uploads to the directory pub/contrib.  I will move
these to read only directories of the appropriate name under pub.  Please
refrain from junk and/or commercial (licsensed) software.  If it is
available elsewhere (as I determine via archie), I will also remove it.

Send a description either at the top of you submission and/or in e-mail
to me at the address above.  I will try to keep an abstract of thos
thing submitted in each subdirectory.  


_______________________________________________________________________
Steven K. Pollack               |
University of Cincinnati        |
Department of Materials Science |   I notice that you are still
  & Engineering                 |   using polymers!
498 Rhodes Hall  ML#12          |     - Lt. Commander Montgomery Scott
Cincinnati, OH 45221-0012       |       U.S.S. Enterprise
spollack@ester.mse.uc.edu       |
________________________________________________________________________
From: sandvig@geom.umn.edu (Cary Sandvig)
Newsgroups: sci.materials
Subject: looking for structure
Date: 7 Apr 92 21:47:20 GMT
Article-I.D.: poincare.SANDVIG.92Apr7154720
Distribution: sci
Organization: The Geometry Center

I'm looking for the structure of a piece of tubular fullurene (sp?).
Preferably in PDB or Cambridge format, though any coordinate file would
be fine.  If anyone out there has such and is willing to email it to me
at sandvig@cray.com, I would be grateful.
--

				-Frang
		       (the beast a man can be)
From: GFCARDINALE@poppy.ucdavis.edu (GEOGORY F. CARDINALE)
Newsgroups: sci.materials
Subject: Wanted:  Textbooks (two).
Date: 14 Apr 92 06:16:57 GMT
Organization: University of Karlsruhe, FRG (Informatik Rechnerabteilung)
X-News-Reader: VMS NEWS 1.20

I am looking for the following two textbooks:

1.  Handbook of Thin Film Technology by L.I. Maissel and R. Glang (eds),
revised edition, McGraw-Hill, NY, 1985 (I believe).

2.  Phase Transformations in Metals and Alloys by D.A. Porter, K.E. Easterling,
Van Nostrand Reinhold, New York, 1981.  ISBN 0-442-30440-4.

I would like to purchase either book if anyone would like to sell theirs.
In addition, the Materials Dept. at UCD is looking to purchase the Phase
Transformations... book for a course, however I believe it is out of print.  If
anyone knows if their bookstore has any copies left for sale, PLEASE contact
me.  I have searched a few bookstores in the Bay Area but have come up empty.

Thank you.

Greg C.
gfcardinale@ucdavis.edu 
Xref: sparky sci.materials:253 sci.engr:1210