HDTenEightyP/NetNews huggingface dataset:
From: murthy@tree.egr.uh.edu (purna)
Subject: advanced courses/topics in school (was Re: Can of Worms revisited)
Organization: University of Houston
Date: Mon, 13 Apr 1992 16:27:19 GMT

Steven Pollack writes
> 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?

hi!

well, i am a grad student in MS&E at UH, and i have had some thoughts about  
this.  it seems (from what i've encountered) that it is very difficult to get  
an advanced, general-level course put together.  the reason is that the amount  
of material to teach/learn would be immense!

speaking from a student's point of view, i wouldn't WANT such a course.   
instead, i'd prefer a curriculum (maybe 2-3 courses) which deal with all of the  
areas systematically and sequentially (kind of like the way calculus is taught  
in 3 parts : differential, integral, and multi-variable).  that way, all of the  
"necessary" material (no pun intended) could be taught without having to cram  
things together.

just my opinions,
-purna
From: mikael@inmic.se (Mikael Jargelius)
Newsgroups: sci.materials
Subject: Dopant delineation in silicon
Date: 10 Apr 92 09:22:24 GMT
Distribution: sci.materials
Organization: Swedish Institute of Microelectronics, Kista

Hi,

I am looking at polished or cleaved cross sections of silicon IC's using an
SEM.

In order to obtain contrast between layers I use different wet chemical
etchants, e.g. diluted HF for aluminium, buffered HF for silicon dioxide etc.

Now, I would like to know if there are any good suggestions for methods to use
to obtain delineation of doped regions in silicon. I have used Sponheimer-
Mills and Rowe etchants and got useful results for high dopant concentrations,
but I would also like to detect lower dopant levels in a reproducible way.

Perhaps some kind of plating could do the job?
--
                                                                    *
----------------------------------------------------------------- * -----------
Mikael Jargelius  -  mikael@inmic.se                  *
Swedish Institute of Microelectronics                 *     *        *
--------------------------------------------------------------- * -------------
Newsgroups: sci.materials
From: routd@woods.ulowell.edu
Subject: bio-electronic materials
Organization: University of Lowell
Date: Mon, 6 Apr 1992 23:09:23 GMT

biomaterials as liquid crystals, memory devices and nonlinear optical
materials!
Any one interested to know/discuss more about them, may contact at
	Routd@woods.ulowell.edu

Thanx,

deeleep rout
chemistry dept.
u mass. lowell
ma 01854
From: dbriggs@zia.aoc.nrao.edu (Daniel Briggs)
Newsgroups: sci.materials
Subject: RFD for IMAGE PROCESSING newsgroup
Date: 13 Apr 92 18:42:13 GMT
Article-I.D.: zia.1992Apr13.184213.3917
Organization: National Radio Astronomy Observatory, Socorro NM

[Third and last time that I'm going to try and post this.  Sorry about the
multiple posts, but something in the crosspost list is buggering things!]

I just thought I'd point out that there is a discussion about an possible
image processing group over on news.groups.  I think it's a *great* idea,
and about bloody time, too.  But I seem to be surrounded by computer
vision / computer graphics people.  Could we get some scientific image
processing people over there too?  If we don't act now, we're likely to end
up with comp.graphics.image.processing, which would be a gross restriction
on an otherwise tremendously useful group.  Actually, I'd like to see a
general imaging group, not restricted to conventional image processing
techniques, but expanded to included techniques of indirect observation,
calibration and processing, as well as general imaging theory.  Say
sci.imaging.  Do we have enough support for such a group?

-- 
| Daniel Briggs  (dbriggs@nrao.edu)                      |        USPA B-14993
| New Mexico Tech / National Radio Astronomy Observatory |            DoD #387
| P.O. Box O / Socorro, NM 87801   (505) 835-7391        |
Support the League for Programming Freedom  (info from league@prep.ai.mit.edu)
Newsgroups: sci.materials,rec.autos,rec.autos.tech
From: sss@netcom.com (Small Systems Solutions)
Subject: Re: Material Science for my Windshield
Date: Fri, 10 Apr 92 22:09:15 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Distribution: na
Keywords: broken windshield glass

In article <1992Apr10.190530.15584@athena.mit.edu> 
	hkon@athena.mit.edu (Henry Kon) writes:

>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 ?

Yes and no.  You must first drill a hole at the ends of the crack to
relieve the stress and stop it from spreading.  A Dremel tool, or other
high-speed drill with a fine bit will work.

The material used by the commercial operations is probably not an
unobtainium.  Its primary purpose is to remove the crazed appearance of
cracks, etc. so visibilty is improved.  It is a polycarbonate.

-- 
Small Systems Solutions                   1563 Solano Avenue, Suite 123
sss@netcom.com                                  Berkeley, CA 94707-2116

The above-expressed opinions aren't necessarily
From: cjs1722@zeus.tamu.edu (STEPANIAN, CHRISTOPHER JOHN)
Newsgroups: sci.materials
Subject: A request for information...
Keywords: Filament Winding, Braiding, Composites
Date: 12 Apr 92 21:56:00 GMT
Organization: Texas A&M University, Academic Computing Services
News-Software: VAX/VMS VNEWS 1.41

Hello folks,

I'm looking for a good book on filament winding and one on braiding for use in 
advanced composite structures. I am looking for a guide to describe how the 
orientations of fibers change as an axi-symmetric mold (tube) deforms in either
a concave or convex fashion (again axi-symmetric). Unfortunately our library
does not seem to have a text describing such a phenomenon in the detail that 
I need, and I have no huge desire to reinvent the wheel (though I will if 
nothing good comes across - it's the round thing, right?). Feel free to send 
mail to me directly; I'll post a compendium of all received suggestions. 

Thanks in advance,

Chris

----------------------------------------------------------------
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		|
----------------------------------------------------------------
Newsgroups: sci.materials
From: orlint@vccsouth08.its.rpi.edu (Timothy Troy Orling)
Subject: No HAZ in 304 Stainless Steel weldment
Organization: Rensselaer Polytechnic Institute, Troy NY
Date: Wed, 8 Apr 1992 22:21:30 GMT


In our Welding Metallurgy and Processes laboratory we welded some
1/4 hard 304 Stainless Steel:
	(1) E308H SMAW: 75, 95, 105 Amps 10-12 ipm CC DC+
	(2) E308T3 FCAW: 180, 200, 230 Amps 33 Volts 17 ipm CV DC+

Etched by immersion in Kaling's with poor results.
Electroetched in 10% Oxalic Acid, 5V (I forget the amperage), 45 seconds!!

In order to get significant definition of the grain boundaries, at least
45 seconds was required.

Base metal shows mechanical twins, but generally equiaxed (some banding).
Fusion zone is mostly cellular dendritic, with epitaxial nucleation at
the boundary.

Absolutely no sign of a HAZ, no recrystallization, no grain growth, nothing.

Also expected to see sensitization, but suspect very low carbon content
(i.e. 304L, not 304).

Any ideas?


-- 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
|  Tim Orling (orlint@rpi.edu)         |  Is global warming really happening |
|  Materials Joining Laboratory        |  or is it just a long range solar   |
|  Rensselaer Polytechnic Institute    |  cycle we don't understand?         |
From: pollack@ucunix.san.uc.edu (Steven Pollack)
Newsgroups: sci.materials
Subject: Materials anonymous FTP site
Date: 12 Apr 92 15:51:52 GMT
Article-I.D.: ucunix.1992Apr12.155152.10139
Organization: University of Cincinnati

I  have set up an anonymous FTP account on our system.  

Its address is ester.mse.uc.edu (129.137.33.217)

It is intended for the exchange of software related to materials
science.  Please deposit you programs to the pub/contrib directory.  I
will then place them in the appropriate locations.  For Mac software,
please BINHEX your files and put a descriptor at the top.  Also, please
e-mail me a descriptor.  I will post news about goodies on
sci.materials.  Currently, McCrackin's ellipsometry analysis program is
available on the pub/contrib directory.  I will maintain this as long
as disk space hold out and interest is there.  Please, no junk file
(GIF's, games, etc).

_______________________________________________________________________
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        |
________________________________________________________________________
From: cpastore@unity.ncsu.edu (Chris Pastore)
Newsgroups: sci.materials
Subject: Re: carbon fiber bows
Keywords: composites, bows, etc...
Date: 8 Apr 92 20:20:09 GMT
Organization: North Carolina State University Computing Center

>>What is the difference in composition and mechanical properties
>>between carbon and graphite fibre?
>>Why carbon fibre materials are generally considered better than
>>fiberglass?
>>What is carbon foam (used in construction of bow limbs)
>>Where to get carbon composites in small quantities?
>
>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))

>Carbon fiber, in general, has a higher stiffness than glass fibers
>which would allow you to use less fibers for the same stiff bow. The
>only problem is that the strength is not necessarily as good as the
>fiberglass. 

Much higher stiffness!  35Msi compared to 5-10Msi.

>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.

Becareful about your starting point for design iteration.

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


-- 
Christopher M. Pastore 	    |Life would be so pleasant
NC State University         |If we all could be
Textile Materials Science   |Helpless, homeless creatures
cpastore@nelson.tx.ncsu.edu |Marching to the sea.
From: leue@tc.fluke.COM (Judy Leue)
Newsgroups: sci.materials
Subject: amalgam fillings
Date: 7 Apr 92 15:00:59 GMT
Organization: John Fluke Mfg. Co., Inc., Everett, WA

The other day as I was flipping screens,I quickly caught a glimps of this 
topic.    It is a topic I am intrested in. Could someone fill me in on
the information shared? My daughter is a dental assistant specializing in
merury toxic poisoning. The question keeps comming around "Why does the 
Dental community (in large) refuse to accept the dangers of mercury in the
mouth?". Other than the obvious reason of money. Any and all comments
welcome.

Judy
From: Dr.Michael.Silverstein@discus.technion.ac.il
Newsgroups: sci.materials
Subject: Re: Can of Worms (please open here)
Date: 9 Apr 92 17:16:55 GMT
Organization: Materials Engineering, Technion

In article <1992Mar31.015129.23898@ucunix.san.uc.edu> pollack@ucunix.san.uc.edu
(Steven Pollack) writes:
>Time to open our first can of worms.  

I tend to like Rosen's or Rodriguez' books, although I must admit that they are
too much for an introductory course.  They are good books on which to base a
course that has just a smattering of everything...

Billmayer is used here a great deal as well...	

I am interested in hearing your summary of results...

mike 
Newsgroups: sci.materials
From: akarpowicz@mta.ca (Adam Karpowicz)
Subject: Carbon fibre composites
Reply-To: akarpowicz@mta.ca
Organization: Mount Allison U, Sackville, N.B. Canada 
Date: Tue, 7 Apr 1992 17:07:05 GMT


I have some questions about carbon composites, and specifically:

What is the difference in composition and mechanical properties
between carbon and graphite fibre?
Why carbon fibre materials are generally considered better than
fiberglass?
What is carbon foam (used in construction of bow limbs)
Where to get carbon composites in small quantities?

I am thinking of making a bow using carbon fibre comp. alone or with 
fiberglass. I got quite a bit of help from netters on alt.archery, i.e.
that carbon fibre makes bows faster and carbon foam (?) helps to stabi-
lize and waterproof the bows, also allowing more bending within elastic
limits (less stacking). Before I get intio this, I thought I'd rather
ask here too.

Thanks for help

Adam
Newsgroups: sci.materials
From: minsky@media.mit.edu (Marvin Minsky)
Subject: Re: steel foam
Keywords: foam
Cc: minsky
Organization: MIT Media Laboratory
Date: Mon, 13 Apr 1992 02:12:40 GMT

In article <1992Apr13.004026.2744@jupiter.sun.csd.unb.ca> akarpowicz@mta.ca writes:
>
>I want to thank everyone who responded to my questions on
>carbon/graphite composites, the discussion that followed was
>enlightening.
>
>I still do not know what is carbon foam.    
>
>Adam

Either do I, but that reminds me of an question I've had for a long
time: why isn't there a structural steel foam material?  Seems to me
it should be very strong and cheap, if there's a good way to make it.
Is the problem simply one of how to keep bubbles from rising?
Clearly, zero-gee ought to help, but I would suppose someone could
invent some way to make such a material!  One way would be to inject
bubbles at high pressure when the steel is at a viscous temperature,
and then rotate it while it does the remaining cooling.  Once the
outside of the "ingot" hardens, we don't care much that the pressure
inside goes negative; in fact that could be an advantage.
  Other ideas might include using some sort of refactory mesh to hold
From: sdb@redbeard.physics.fsu.edu (Scott D. Berry)
Newsgroups: sci.materials
Subject: Re: Why do Fullerenes form in MBE?
Date: 14 Apr 92 07:39:02 GMT
Organization: none

In article <phrjz0#@lynx.unm.edu> swami@chtm.eece.unm.edu (Swami srinivasan) writes:
>
>	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).
>
Are you sure that the fullerenes are formed in the MBE process?  I do know
of work involving the sublimation of fullerenes in MBE machines (where the
"molecule" in MBE is the fullerene) to form single crystal thin films.
As far as I know, you cannot form C60 and C70 from C atoms in a MBE environment.


>	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?

As I said above, I doubt it.

>=======================================================================
>swaminathan srinivasan
>center for high tech materials
>univ. of new mexico, albuquerque		cogito ergo sum
>
>swami@chtm.eece.unm.edu
>=======================================================================

Grower of single crystal magnetic oxide materials (iron oxide, nickel oxide):

Scott D. Berry    Assistant Professor of Physics    Florida State University
315 Keen Bldg, B-159, Tallahassee, FL 32306-3016    (904) 644-1218
INTERNET:   berry@redbeard.physics.fsu.edu    BITNET:   berry@fsu
From: emf@crow.ugrad.ee.ufl.edu (Ed Filangeri)
Newsgroups: sci.materials
Subject: Spreading Resistance
Date: 13 Apr 92 18:08:11 GMT
Organization: UF EE Department

If anyone has any information pertaining to probe noise modelling of a 2-probe spreading resistance system , please post a reply or contact me at:

	emf@sioux.ugrad.ee.ufl.edu
						Thanks,

                                                Ed Filangeri
                                                Univ. of Florida
                                                Dept. of EE
                                                Reliability Physics Group
Newsgroups: sci.materials
From: natelson@burst.Princeton.EDU (Douglas Natelson)
Subject: ir reflectivity
Originator: news@ernie.Princeton.EDU
Organization: Princeton University
Distribution: sci.materials, sci.physics
Date: Fri, 10 Apr 1992 20:29:43 GMT

Hi.

Hi.  For my independent work, I've performed reflectivity measurements
of some substances (bismuth, antimony, yttrium, dysprosium) in the ir,         
range (~ 600 cm^-1 to 8000 cm^-1).  My problem is that I can't find any
reference reflectivity spectra to compare my results with, and I'm also
having a tough time finding good (interesting) materials to look at.
If anyone out there could direct me to a reference work which contains
information of this nature, I'd greatly appreciate it.

My e-mail address is natelson@phoenix.princeton.edu .
l 
					Thanks,
					   Doug Natelson 

 
                                     
Newsgroups: sci.materials,sci.electronics
From: bill@extro.ucc.su.OZ.AU (William Logan Lee)
Subject: Re: WAX CRACKS when it cools off
Organization: Uni Computing Service, Uni of Sydney, Australia
Date: Wed, 8 Apr 1992 05:21:19 GMT

In article <1024@proton.UUCP> radoias@charity.llumc.edu () writes:
>Does anyone know the secret to producing wax cubes (6 inches a side)
>without the wax cracking?
>
>Costin Radoias

One idea is to use the same methods as used in steel billet casting.
Use a long column of wax, say 12 inches tall, that has at its end
the 6" cube mould.  Pour wax into the mould so that there is a head
above the desired mould that provides a ready supply of liquid wax
to fill up the shrinkage caused on cooling. After the whole mass has
solidified, cut off the desired cube at the end.  This should have
a better integrity than pouring in stages. eg:

    ||      ||
    ||      ||
    ||      ||
    ||      ||
    ||      ||
    ||      ||
    ||      ||
    ||      ||___ Cut off at this point to make a cube.
     |      |
     |      |
     |      |
     |______|---- You also may want to trim off the end

Depending on the level of contamination of the used wax, you may want
to  cut off the very end to remove heavier-than-wax impurities as well
as throwing away the very top of the column to remove the floating
contaminants.

It would also help to know what type of cracks you were experiencing:
which way did they run, etc, as this may assist in determining the
origin of their cause.

If your mould is metal, the wax may be solidifying too fast, and not
allowing the column of liquid wax to feed the mould below.  Insulating the 
mould as shown above should enable it to provide the necessary reservoir.

A taper on the walls of the upper reservoir should assist in freeing the
solidified mass afterwards, as well assisting to prevent the wax freezing
in the reservior above. Wildly exaggerated:

     \\            //
      \\          //
       \\        //
        \\      //
         |      |
         |      |
         |      |
         |______|

Bill Lee
Newsgroups: sci.materials
From: biesel@javelin.sim.es.com (Heiner Biesel)
Subject: aerogels
Keywords: aerogels
Organization: Evans & Sutherland Computer Corporation
Date: Mon, 13 Apr 1992 15:55:41 GMT

I've been interested in aerogels ever since I read about them. Unfortunately,
I know very little about them. Perhaps someone on the net would be so kind
as to post a little basic info about them? As I recall, they are rigid, and
transparent, of very low density, and able to support masses many times 
greater than their own mass. The problems seem to be high cost of manufacture,
and instability in the presence of moisture. Correct so far?

Has anyone succeeded in encasing aerogels in membranes to keep out the 
moisture? Is it possible to construct an aerogel that is lighter than air
by using hydrogen or helium? What are the mechnical properties of a typical
aerogel? How does an aerogel respond to being crushed?

Regards,
       Heiner biesel@thrall.sim.es.com
From: mwj@beta.lanl.gov (William Johnson)
Newsgroups: sci.materials
Subject: Growing aluminum antimonide crystals
Summary: Anyone out there trying it, or know of references?
Date: 13 Apr 92 22:49:43 GMT
Article-I.D.: newshost.1992Apr13.224943.13099
Organization: Los Alamos National Laboratory


I'd appreciate some help in tracking down information about growing aluminum
antimonide (try saying that fast three times! :-) ) crystals.  AlSb has some
interesting properties (at least in theory) from a semiconducting point of view
that make it appealing as possible raw material for gamma-ray spectrometry,
which is what I do for a living.  A friend is trying to squeeze some money out
of the feds for research on the stuff, and I'd like to help him out.

As far as we know, about the most recent attempt at growing high-purity AlSb
was at Livermore about 10 years ago.  That project died prematurely, for more
or less political reasons.  It's a *hard* problem; the tendency of both 
elements to oxidize and the inconveniently low melting point of antimony
combine to cause purity problems.  The friend works at LLNL and has access to
the work that was done there, but if there is anything going on in the private
sector that's newer (and not in the literature), it might be nice to know about
it.  Any help appreciated ...  Please reply by e-mail to avoid cluttering up
the net.

-- 
Bill Johnson				| "This is a bit complicated, so let
Los Alamos National Laboratory		| me explain it backwards."  (first
Los Alamos, New Mexico USA		| line of a memo from a fellow Los
!cmcl2!lanl!mwj (mwj@lanl.gov)		| Alamos physicist who will go unnamed)