HDTenEightyP/NetNews huggingface dataset:
From: ewstroup@cc.utah.edu (ERIC W. STROUP)
Newsgroups: sci.materials
Subject: Re: Polymer Microscopy
Date: 12 Oct 92 18:26:00 GMT
Organization: University of Utah Computer Center
News-Software: VAX/VMS VNEWS 1.4-b1

In article <00961D72.F55712C0@vms.csd.mu.edu>, 5916rahmank@vms.csd.mu.edu writes...
{In article <03249587.718611696@mama>, 03249587@mama.minmet.uq.oz (Darcy Clark) 
{>writes:
{> I'm doing some research in the polymers field and at the moment doing some
{> high-resolution TEM (+ some SEM) - I'd like to here from anyone who is 
{> conducting research in of a similar vein!
{>				  Darcy Clark
{>				  Uni of Queensland,Brisbane,Austrlia
{--------------------------------
{ 
{	I donno what kind of samples you are studying and what you are
{	trying to probe. In general Electron Microscopy is an absorbed
{	field. I have used SEM, TEM and HREM to study an oxide-glass
{	composite system. 
{ 
{	I could share some of my experience if I knew what you are
{	interested in.
{ 
{	-Anis.



One of the leading experts on polymer microscopy is Dr. Stuart Cooper at 
University of Wisconsin - Madison.  He has published extensively on 
TEM and SEM of polymers.  The NIH has a "center" for polymer microscopy
in which he is the key player.

-Eric
ewstroup@cc.utah.edu
Newsgroups: sci.materials
From: brantley@infonode.ingr.com (Dwight D. Brantley)
Subject: high voltage insulation breakdown
Organization: Intergraph Corporation, Huntsville, AL.
Distribution: usa
Date: Fri, 9 Oct 1992 15:38:40 GMT

I am experiencing a breakdown of the insulating properties of a high
voltage wire which seems to be related to several possible causes.  I
am having difficulties determining the exact cause of the breakdown.
The following is a description of the materials, the application and
the failure mode:

This is a high voltage anode wire which connects the high voltage power 
supply (29KV) to a CRT in a color monitor.  The wire is constructed from
a single strand copper wire (.01" diam.) and wrapped with a braided copper
which has been tinned (solder dipped) resulting in a .031" diameter
conductor.  This is surrounded by a PVC insulation which has markings
such as "XLPVC   TV-40   VW-1 OR CSA   40KV DC STYLE 3239".  The high
voltage power supply is self contained in a metal box and the anode wire
exits the box through a rubber grommet.  The wire makes an "S" bend
inside the box and exits the box at a slight angle which causes some
compression of the insulation by the grommet.  I forgot to mention that
the wire insulation is .185" diameter with a wall thickness of .154".
The anode wire insulation is breaking down either under the grommet or
right at the edge of it resulting in high voltage arcing to the metal
box.  The arcing leaves a hole in the insulation and can occur either
inside the box or outside but is always associated with the grommet.

Has anyone had any experience with this kind of problem?  Our theories
so far include the possibility of a plasticizer in the grommet causing
a breakdown of the insulation but we have other designs which use the 
same materials but are oriented differently and these do not experience
the problem.  This leads us to believe that a combination of bends in
the wire, compression by the grommet and residual plasticizers within
the grommet could all contribute to the failures we are experiencing.
I am looking for a source of information or first hand knowledge from
anyone who is familiar with high voltage phenomenon.  Any info or 
direction to a source of information would be greatly appreciated.

      ******************************************************************
      *   Dwight Brantley    *   Failure Analysis & Reliability Dept.  *
      *  Intergraph, Corp.   *  Reply To: brantley@falab1.b21.ingr.com *
      *   Huntsville, AL     *           Voice: 205-730-4456           *
      ******************************************************************
From: dlmedli@snll-arpagw.llnl.gov (medlin douglas l)
Newsgroups: sci.materials
Subject: Re: Uses of Be
Date: 13 Oct 92 02:59:06 GMT
Organization: Sandia National Labs, Livermore, CA

>>In article <1992Oct2.113921.2739@mtroyal.ab.ca>, dhayward@mtroyal.ab.ca writes:
>>>For years I have been interested in the present and future uses of
>>>Berrylium....

Beryllium is used frequently in applications where one wants to
avoid large amounts of secondary x-ray flourescence: thus it
is frequently used as an x-ray window material for x-ray detectors
and a material for making low background specimen stages for
analytical electron microscopes.  One advantage for x-ray
windows on SEMs is that Be is strong enough to withstand an atmosphere
of pressure even when the window is thin enough to
allow a large amount of x-ray transmission.  

Doug Medlin
dlmedli@snll-arpagw.llnl.gov
Newsgroups: sci.materials
From: cjs1722@zeus.tamu.edu (STEPANIAN, CHRISTOPHER JOHN)
Subject: Re: Al honeycomb sandwitch panels
News-Software: VAX/VMS VNEWS 1.41    
Organization: Texas A&M University, Academic Computing Services
Date: Fri, 9 Oct 1992 15:55:00 GMT

In article <10616330.16.718510858@eng2.eng.monash.edu.au>, 10616330@eng2.eng.monash.edu.au (STUART ROBERTS) writes...
>Can anyone suggest a suitable glue for the construction of Al honeycomb 
>panels with Al skins. The operating environment is the same as that of a 
>car. A glue that doesn't need temperatures above 200 C would be best.
> 
>Thanks in advance,
>	Stu.

A suitable solution to would be FM300, produced (I think) by American Cyanimid.
Another product that is essentially the same thing is fabicated by 3M;I can't
remember the product number. These products have brothers and sisters in the
same line that have different material properties (shear modulus, cure temp,
hydroscopic tendancies, etc...). You might be best off contacting these
companies and requesting fact sheets on their whole 'sheet adhesive' line and
then determine the best product for the conditions (including price) that the
sandwich has to deal with. BTW the products are not cheap, but you can sometimes
get samples that cover your needs.

Good luck,

Chris Stepanian
Department of Ocean Engineering
Texas A&M

Newsgroups: sci.materials
From: 10616330@eng2.eng.monash.edu.au (STUART ROBERTS)
Subject: Al honeycomb sandwitch panels
Organization: Faculty of Engineering, Monash University 
Date: Thu, 8 Oct 1992 02:20:58 GMT

Can anyone suggest a suitable glue for the construction of Al honeycomb 
panels with Al skins. The operating environment is the same as that of a 
car. A glue that doesn't need temperatures above 200 C would be best.

Thanks in advance,
	Stu.
From: ivy@hpscit.sc.hp.com (Ivy Griffiths)
Date: Thu, 15 Oct 1992 19:30:57 GMT
Subject: Re: high voltage insulation breakdown
Organization: Hewlett-Packard, Santa Clara, CA
Newsgroups: sci.materials

Try contacting Belden.  They are a major manufacturer of wires.  A contact
I have in my card file is John Staates (a technical person, not a sales rep)
in their product develoment group.  His 800# (I can reach this from CALIF)
is 800-235-3362.  Another problem that might be causing part of your
problem is the adhesion of the insulation to the metal.  If this is subpar
you'll have problems.  Any reduction in X-sectional area will increase your
resistance.  Any deformations or cracks will affect the x-sectional area.
The quality of any solder joints also could be suspect.  If you have a "cold:
solder joint" (a blob of solder without good electrical continuity), you'll
also have high resistance.

Ivy Griffiths
Materials Engineer
HP-Santa Clara Division

Newsgroups: sci.materials
From: Department of Inorganic Chemistry (Ramin G. Shamsili)
Subject: Sample preparation for XPS/Auger??
Organization: Norwegian Institute of Technology
Date: Fri, 9 Oct 92 13:24:10 GMT

Problem Definition :
Penetration of molten bath and Sodium in  cathodically polarized Carbon samples which are exposed to 
molten cryolite + Aluminum Fluoride + Alumina + Calcium Fluoride,is under investigation.
Molten bath penetrates the carbon matrix through voids and pores after Sodium is 
absorbed in.
It is reason to believe that some compounds such as AlN formed during the penetration process
enhance the wettability of carbon and thus lead to faster penetration and deterioration of carbon.
XPS/ Auger analysis of wall surfaces where frozen salt has filled the voids/pores
can determine whether certain compounds at these surfaces exist.
The samples are cylindrical; Breaking or cutting the samples will result in rough surfaces which
need polishing befire Auger/XPS analysis. However polishing destroys or contaminates the
frozen salt in the pores.
Do you have any experience with samples preparation and analysis by means of XPS
or Auger spectroscopy?
My E-mail adress is : ramins@hitra.kjemi.unit.no
Post adress : Institute for Uorganiskkjemi
              NTH, 7034 Trondheim Norway.
From: jgd@dixie.com (John De Armond)
Newsgroups: sci.materials
Subject: Re: Uses of Be - toxicity
Date: 14 Oct 92 16:06:50 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

lachlan@dmp.csiro.au (Lachlan Cranswick) writes:

>Just a small query :-
>What handling procedures make handling berylium "extremely harmless"?          
>(In theory CFCs can be contained in such a way that they don't
>affect the OZONE layer, but why is there the rush for alternatives?)

Certainly not from any scientific reasons.

>(Mercury spills are cleaned
>up by adding elemental Sulphur over the area, what imobilizes
>beryllium?)

I once had the Hazmat team called out after I dropped a mercury thermometer.
Again, no basis in science.

>Given the above attitude on beryllium, you will
>probably find it typically paranoid that our radiation lab
>considers anything above background to be a
>leak that has to be fixed.  

In a radiation lab, that is considered as much radiation hygene in order
to keep backgrounds low as it is a health precaution.

>It can be 
>argued that compared to the health risks of pollution,
>passive smoking, junk food, coca-cola etc,
>these potential hazards are not much of a
>health risk.  This could be correct, but it is much
>nicer to work in an lab environment where the emphasis
>is on more safety rather than less safety.

Actually no.  I find the lawyer-induced "precautions" now practiced
by most businesses and institutions opressive.  I seemed to have done
quite well back when all that was needed for most procedures was a pair
of glasses and a lab apron.

>The original question was why Beryllium isn't used more
>widely (in mainstream uses).  My opinion (still)
>is that Beryllium is so toxic people would
>prefer to use alternatives rather than risk its harmful effects.

But it has nothing to do with the ACTUAL risks.  Here in the US, we
have a little problem with lawyers and with people looking for a free
mealticket for the rest of their lives.  That means that managers must
take extreme steps, far beyond anything scientifically reasonable,
so that he will appear "reasonable" to 6 or 12 blithering idiots (the
jury screening process screens anyone with a clue) if he gets sued.

You asked about disposing of your X-ray tubes.  Your supplier is not
doing you much of a favor "disposing" of those tubes.  At least in 
medical and XRF application tubes, they are rebuilt and resold.
Much too expensive to simply throw away.  I'd have to commend your supplier,
however.  He's put a great marketing spin on it. :-)

John

-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine (TM) |
Marietta, Ga                         |Interested in high tech and computers? 
jgd@dixie.com                        |Write me about PE Magazine
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
Newsgroups: sci.materials
From: John_Mansfield@mse.engin.umich.edu (John F. Mansfield)
Subject: Re: Polymer Microscopy
Date: Mon, 12 Oct 92 17:30:10 EDT
Organization: North Campus EMAL, University of Michigan
Followup-To: sci.materials

In article <12OCT199211261240@cc.utah.edu>, ewstroup@cc.utah.edu (ERIC W.
STROUP) wrote:
> 
> In article <00961D72.F55712C0@vms.csd.mu.edu>, 5916rahmank@vms.csd.mu.edu writes...
> {In article <03249587.718611696@mama>, 03249587@mama.minmet.uq.oz (Darcy Clark) 
> {>writes:
> {> I'm doing some research in the polymers field and at the moment doing some
> {> high-resolution TEM (+ some SEM) - I'd like to here from anyone who is 
> {> conducting research in of a similar vein!
> {>				  Darcy Clark
> {>				  Uni of Queensland,Brisbane,Austrlia
> {--------------------------------
> { 
> {	I donno what kind of samples you are studying and what you are
> {	trying to probe. In general Electron Microscopy is an absorbed
> {	field. I have used SEM, TEM and HREM to study an oxide-glass
> {	composite system. 
> { 
> {	I could share some of my experience if I knew what you are
> {	interested in.
> { 
> {	-Anis.
> 
> 
> 
> One of the leading experts on polymer microscopy is Dr. Stuart Cooper at 
> University of Wisconsin - Madison.  He has published extensively on 
> TEM and SEM of polymers.  The NIH has a "center" for polymer microscopy
> in which he is the key player.
> 
> -Eric
> ewstroup@cc.utah.edu

You should also check out the work by David Martin and his students here at
the University of Michigan.  They do a considerable amount of HREM of
polymeric materials.  It is neat work, very difficult to do too, some of
it.
I mention it as I think Dave would be too modest to post this himself.

 

John Mansfield, North Campus Electron Microbeam Analysis Laboratory,
2455 Hayward, Ann Arbor, Michigan 48109-2143. Ph: (313)-936-3352.
__________
YYURYYUBICURYY4ME.
From: tibbits@sisal.llnl.gov (Patrick Tibbits)
Newsgroups: sci.materials
Subject: Re: Uses of Be
Date: 11 Oct 92 20:47:21 GMT
Organization: Lawrence Livermore National Laboratory

Can anyone provide a summary of what is known about the brittleness
problem? A bibliography as well.

Patrick
From: ccjensen@fnalc.fnal.gov (Chris Jensen)
Newsgroups: sci.materials
Subject: Re: high voltage insulation breakdown
Date: 16 Oct 92 21:00:18 GMT
Distribution: usa
Organization: Fermi National Lab, Batavia IL

In article <64400001@hpscit.sc.hp.com> ivy@hpscit.sc.hp.com (Ivy Griffiths)
writes:
>Try contacting Belden.  They are a major manufacturer of wires. ...
>
I missed the original post. Is this in the context of interconnects
or capacitors of what? I am doing work with high voltage (40 - 60 kV)
pulsed and DC systems.
Chris Jensen
From: 5916rahmank@vms.csd.mu.edu (K. M. A. Rahman)
Newsgroups: sci.materials
Subject: Re: Polymer Microscopy
Date: 9 Oct 1992 20:50:18 GMT
Organization: Marquette University - Computer Services
Reply-To: 5916rahmank@vms.csd.mu.edu
NNTP-Posting-Host: vmsd.csd.mu.edu

In article <03249587.718611696@mama>, 03249587@mama.minmet.uq.oz (Darcy Clark) 
>writes:
> I'm doing some research in the polymers field and at the moment doing some
> high-resolution TEM (+ some SEM) - I'd like to here from anyone who is 
> conducting research in of a similar vein!
>				  Darcy Clark
>				  Uni of Queensland,Brisbane,Austrlia
--------------------------------

	I donno what kind of samples you are studying and what you are
	trying to probe. In general Electron Microscopy is an absorbed
	field. I have used SEM, TEM and HREM to study an oxide-glass
	composite system. 

	I could share some of my experience if I knew what you are
	interested in.

	-Anis.
From: kwg@creare.com (Kent G.)
Newsgroups: sci.materials
Subject: Re: IR detector discussion ???
Date: 12 Oct 92 13:40:00 GMT
Reply-To: kwg@spock.creare.com (Kent Goeking)
Distribution: w
Organization: Creare Inc., Hanover, NH

In article <1992Oct8.145803.1@stsci.edu> gawne@stsci.edu writes:
>From Bill Gawne at the Space Telescope Science Institute
>gawne@stsci.edu
>
>Hi all.  Is there anyone out there in netland interested in
>discussing IR detector materials?  I was thinking of InSb
>Pt:Si, and HgCdTe in particular; but any lead chalcogenide
>folks would be welcome too.

I'm interested, particularly in the preparation of these materials.  I'm a
crystal grower and would like to know what problems exist with the above
mentioned state-of-the-art materials.  Is their composition uniform enough?
Is the defect desity low enough? Is the available size large enough?  Do
they posses sensitivities high enough?

I'd be interested in hearing what experience others have had in using and
preparing these materials.  

Kent Goeking
Creare Inc.
kwg@creare.com
From: jgk@osc.COM (Joe Keane)
Newsgroups: sci.crypt
Subject: Re: Secure 32-bit checksum needed
Summary: You need more bits.
Keywords: entropy
Date: 7 Oct 92 06:17:09 GMT
Reply-To: Joe Keane <jgk@osc.com>
Organization: Versant Object Technology, Menlo Park, CA
Weather: cloudy, high 73, low 57
Moon-Phase: waxing gibbous (82% of full)

In article <bontchev.717961294@fbihh> bontchev@fbihh.informatik.uni-hamburg.de
writes:
>I need a 32-bit cryptographically strong checksum.

I'd say this is a contradiction in terms.  Four billion is not a very large
number.  A low-end workstation executes this many instructions in minutes.  A
given message could probably be spoofed with a few weeks of CPU time.  Of
course if you send out many messages, it's that much easier for your opponent
to find a match.  I think even 64 bits isn't all that safe.  There's a reason
why good hash algorithms put out 128 bits or more.

--
Joe Keane, amateur cryptologist
jgk@osc.com (uunet!amdcad!osc!jgk)
Newsgroups: sci.crypt
From: kennethr@idt.unit.no (Kenneth Roar Iversen)
Subject: Re: .. and these days ??
Organization: Div. of CS & Telematics, Norwegian Institute of Technology
Date: Wed, 14 Oct 92 14:02:13 GMT

In article <1992Oct14.134120.1@tnclus.tele.nokia.fi> elahde@tnclus.tele.nokia.fi writes:
>In article <54546@dime.cs.umass.edu>, shri@freal.cs.umass.edu (H.Shrikumar) writes:
>>   with so much hue and cry being raised today over privacy issues
>> in public telecom, and tapping of cellular phones .. I wonder
>> if some group is looking into adaptation of any digital encryption
>> schemes, esp. two key schemes for cellular phone use, esp the
>> newer digital cellular phone standards. 
>
>The GSM system that is already in small commercial use in Europe uses
>digital encryption. GSM is a digital cellular system that will cover
>the whole Europe in a few years. GSM systems from Nokia Telecommunications
>are in commercial use at least in England and Finland.
>
>Eero

As far as I know the encryption is applied on the radio-jump (is that what
it is called in English?). The data is thus in clear on the physical cable
from the receiver-station and in the switches.

Kenneth

that is Kenneth R. Iversen
        KITH
        Norway
From: jimkirk@news.uwyo.edu
Newsgroups: sci.crypt
Subject: Re: mc100.zip (mcrypt)
Date: 13 Oct 92 15:36:52 MST
Distribution: sci,world
Organization: University of Wyoming - Laramie, WY

In article <1992Oct13.864.271@ALMAC>, keith.willis@almac.co.uk writes:
> 
>         I have come across an implementation of RSA distributed by a
>         company in Wales, UK, which claims to perform RSA encryption
>         on the entire file, rather than just on a session key for a
>         conventional algorithm.  The program may be common knowledge,
>         but it is the first time I have come across it.  It is called
>         MCRYPT, and is distributed by a company called Digital
>         Crypto as shareware.
> 
>         What puzzles me is that encryption is very fast - less than 2
>         minutes for a 40k text file using a 250 digit key - but
>         decryption is _glacial_ - over 3 hours for the same file on
>         the same PC.

A common speedup is to use an extremely small encryption exponent, such
as 3.  I believe Knuth even proposed this at one point.  Raising something
to the third power is *VERY* much faster than raising to large powers.
Unfortunately, a corresponding decryption exponent will necessarily (it
seems) be very large, and the modular exponentiation will be correspondingly
hugely slower.

The big problem with a small exponent is if you use it to communicate with
more than "n" people, where "n" is the encryption exponent, but the details
have been lost as I read the paper on that quite some time ago.

Also, if it is known by an enemy that many of your plaintext blocks
happen to contain very small numbers (lots of leading zeros) then
cubing it isn't different than cubing mod m.  Then just take the integer
cube root, and you've decrypted that block.  Rare, though.  (In any case,
avoid blocks equal to zero).

Jim Kirkpatrick       jimkirk@corral.uwyo.edu
Newsgroups: sci.crypt
From: ptrei@bistromath.mitre.org (Peter Trei)
Subject: Re: VCR Plus Codes
Organization: The MITRE Corporation
Date: Wed, 14 Oct 1992 15:22:30 GMT

In article <1992Oct12.224852.2170@draco.macsch.com> m_reymond@macsch.com
writes:

>I am new to this newsgroup and I have been trying to figure out how
>the VCR Plus codes are derived?
>Thanx

     Gemstar claims all kinds of patents and copyrights on the code
numbers and the software to create them, and has threatened lawsuits
against people who experimented with them, including people on this
newsgroup.

    Nevertheless, the algorithm for codes of up to 6 characters (ie,
the vast majority of them) has been decrypted and published:

"Decoding a VCR controller code" by Shirriff, Welch, and Kinsman, in
Cryptologia, Vol XVI, number 3 (July 1992), p227-234.

    Includes a detailed description of the process, and example
pseudocode.

    Curiously, the channel number is only 5 bits long. Is this device
useful on large cable systems?

							Peter Trei
							ptrei@Mitre.org
From: mathew <mathew@mantis.co.uk>
Newsgroups: sci.crypt
Subject: Re: RSA outside the US
Date: Mon, 12 Oct 92 14:22:54 BST
Distribution: world
Organization: Mantis Consultants, Cambridge. UK.

jsteiner@anwsun.phya.utoledo.edu (jason 'Think!' steiner) writes:
> please correct me if i'm wrong, but in reading the FAQ my mind started
> to boggle & i need to clarify this:
> 
>    1. RSA is pretty much a standard in Europe.
>    2. it is illegal to export RSA stuff from the US.

Absolutely correct, unless you get official permission for the export.

> now i've always thought the US government was a bit bass ackwards,
> but this is just silly.

Correct again.

It's the same with DES.  Mustn't export DES from the US.

Mantis uses DES in its software.  I have both the ANSI and military DES
specifications.

Silly, huh?

> jason "maybe i should move to the CIS..." steiner

If you do, you'll find that they already have DES and RSA.  I've chatted to
people in Russia who use PGP.  Basically, the US government's export controls
have been completely ineffective at stopping cryptographic technology from
leaving the US.

However, they do mean that no US company that might compete with Mantis can
use DES or RSA in products it ships to Europe.  Neat, huh?


mathew
-- 
You can communicate with me securely using PGP 2.0.  For more information
send mail to pgp@mantis.co.uk.

Newsgroups: sci.crypt
From: rbrand@usasoc.soc.mil (Raymond S. Brand)
Newsgroups: sci.crypt
Subject: Re: PGP... Availaible
Date: 15 Oct 92 18:45:49 GMT
Organization: A nice thing...

In article <1992Oct14.204738.18237@fwi.uva.nl>, bosman@fwi.uva.nl (Cor Bosman) writes:
 
> There is an amiga binary already available. You can get it on
> amiga.physik.unizh.ch  /amiga/util/crypt/PGP20amiga.lha
> I suggest you use this one, cause the original pgp package
> misses some vital amiga files (mostly assembler) 
> I did include them with this binary and they will be added to
> the next pgp release.
> If anyone makes any patches for amiga, id also like to have them,
> so we can also put them into the released versions.

> Cor Bosman
> -- 
> |bosman@fwi.uva.nl_   //     | Honest Officer , had I known my health      |
> |-----------------\\ //AMIGA | stood in jeopardy I would never had lit one.|
> |  PE no.1         \\/       |             -MAXIM (of the Hells Angels)-   |
> |__________ Quickly Scotty,beam me up.There is no ox..y..ge..._____________|

Would you please make your changes and patches available.

							rsbx

Raymond S. Brand