HDTenEightyP/NetNews huggingface dataset:
From: weber@jedi.ssd.lmsc.lockheed.com (Kevin Weber)
Newsgroups: sci.materials
Subject: Re: Selecting a plastic for a calculator
Date: 27 Jan 93 20:48:59 GMT
Followup-To: sci.materials
Organization: Lockheed Missiles & Space Co.

In article <1k6fs0INNo19@elroy.jpl.nasa.gov>, gwalsh@kilroy.Jpl.Nasa.Gov
(Gerald J. Walsh) wrote:
> 

> I started by just asking people and so far, I have had Lexan or ABS
> suggested as a possible solution.  If I choose one of those, or whatever
> I choose for that matter, I will have to describe the crystal structure
> (Face Center Cubic, Body Center Cubic or Hexagonal Closed Pack).  I
> also have to discuss the market, price and my intended distribution
> channels.  I will have to identify the materials that make up the
> plastic I choose.  Finally, the process steps need to be discussed and
> the companies that can provide the choosen plastic or its components.

Lexan or ABS are not cyrstalline, they are polymers, and while portions may
be 'crystalline', the majority of it is not crystalline (amorphous is the
proper term) in the sense that you are using it.  Think of them more as a
bowl of spagetti; many long chains of atoms intertwined.


> Is Lexan or ABS a good choice?  Too expensive?  Where can I get information
> on the crystal structure for the choosen plastic?  Any good sources I
> could look for in the library?

Lexan is much more expensive than ABS.  You might also consider cellulose
acetate; that's what they make many soap dishes and the like out of.  Here
are some prices (they should be considered as relative; they may not be
current actual prices):

ABS                     $1.75 / lb
Cellulose Acetate       $1.71 / lb
Lexan                   $2.62 / lb

Some things to look for:

Price
Impact Strength (so it can withstand some abuse)
Processibility  (can it be molded into the desired shape)
Wheatherability  (Lexan beats ABS on this one)
Assembly  (will it be glued, or snapped together.  Cellulose is poor if you
need it to snap together; doesn't bend very well.)
Color and colorability (Don't want a clear case, or do we?)

(Perhaps readers could suggest more)

Overall I think ABS probably has the best combo of what you're looking for.
 Lexan is better stuff but a bit expensive.

For information try reading sections on 'polymers' in basic chemistry books
as a start.  Then perhaps the "Modern Plastics Encyclopedia".

KEVIN
Newsgroups: sci.materials
From: berg@uxa.cso.uiuc.edu (bergstrom daniel b)
Subject: Preferred orientation in thin film growth - papers?
Organization: University of Illinois at Urbana
Date: Fri, 22 Jan 1993 02:42:36 GMT

I am studying the development of microstucture in sputtered metallic films.
In particular I'm looking into how a preferred orientation of the crystal
arises during growth.  Currently, I'm in the midst of a literature search,
but "preferred orientation" isn't a good keyword to search on.  I've got
some papers on "crystal growth from the vapor phase" but not much that's
recent.  Does anyone know any good papers in this area or related areas?
Thanks in advance.

Dan Bergstrom
berg@uxa.cso.uiuc.edu

Newsgroups: sci.materials
From: jgd@dixie.com (John De Armond)
Subject: Re: Help me find Wood's Metal, please.
Date: Thu, 21 Jan 93 17:28:21 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

danube@max.physics.sunysb.edu writes:

>    HELLO.  I need some Woods Metal, both for low temp. soldering and
>to make a temperature bath that can reach 220 C without sending fumes
>into our spectrometer.  I was using oil but it fumes badly in nitrogen
>and could possible flash if air got in.

I can't help on the Woods Metal but for a temperature bath, have
you considered Fluorinert, silicone oil or fluidized beds?  I have 
used all three as calibration baths.  The fluidized bed will easily
carry you over 1000 C.  Dow Corning makes several silicone oils
that don't visibly fume at 400 C.

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine(TM) | Interested in high tech and computers? 
Marietta, Ga                         | Send ur snail-mail address to 
jgd@dixie.com                        | perform@dixie.com for a free sample mag
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
From: mt90dac@brunel.ac.uk (Del Cotter)
Newsgroups: sci.materials
Subject: Amorphous diamond film
Date: 25 Jan 93 16:45:46 GMT
Organization: Brunel University, West London, UK

What colour is amorphous diamond film?  Just curious; we had a lecture on
phase equilibria today and the question came up.

Any other gee-whiz facts on the manufacture/properties/applications of ADF?

-- 
 ',' ' ',','  |                                                  |  ',' ' ',','
   ', ,','    |       Del Cotter       mt90dac@brunel.ac.uk      |    ', ,','  
     ','      |                                                  |      ','    
Newsgroups: sci.materials
From: hkon@athena.mit.edu (Henry Kon)
Subject: Why don't glues work
Organization: Massachusetts Institute of Technology
Date: Sat, 23 Jan 1993 01:57:48 GMT

I have tried to glue a piece of plastic on my kid's stroller.

I tried epoxe, then "crazy" glue.

They both failed.  This seems to happen a lot with plastic.  How
do I glue plastic ?  Is there any general rules ? 

hk

--
Henry Bruno Kon
office: 617-253-2781 (with machine)
home:   617-625-3972 (with machine)
From: jin@sol1.lrsm.upenn.edu (Xuegen Jin -Luzzi)
Newsgroups: sci.materials
Subject: DataBase for Metallurgical Processing
Date: 22 Jan 93 19:00:19 GMT
Organization: LRSM, University of Pennsylvania

HI, Everybody:

	I am interested in searching for some original papers on metaluurgical
processing. Is there anyone who knows there is a special database covering archives
and indexing of journal articles on metallurgy or materials sci & eng.?
	E-mails are appreciated. Thanks all.

Xuegen Jin

LRSM, UPENN


Xref: sparky sci.materials:1165 sci.physics:23200
From: landvogt@cs.tu-berlin.de (Walter Landvogt)
Newsgroups: sci.materials,sci.physics
Subject: simulation of ferromagnetic behavior
Date: 21 Jan 1993 08:38:51 GMT
Organization: Technical University of Berlin, Germany
Distribution: sci
NNTP-Posting-Host: morgen.cs.tu-berlin.de
Summary: ask for advice
Keywords: ferromagnetism, simulation

Better late than never:

   A happy new year to all of you!

Has anybody any experience in simulating the magnetic behavior of
ferromagnetic material in magnetic fields?

MacNeal-Schwendler Corporation offers an analysis system (MSC/EMACS).
- Who works with this system?
- Are there other systems on the market?
- Which are the pros and cons of those systems?

In particular, I'm interested in modelling ferromagnetic properties, so
- How does the hysteresis loop pass into the simulation system?
- How do they deal the shape dependency of the magnetization curve?

I would be thank you for any information which puts me on the right
track.
--
------------------------------------------------------------------------
Dipl.-Phys. Henry Zander, IPK-Berlin    | email: henry.zander@ipk.fhg.de
Pascalstr. 8-9, 1000 Berlin 10, Germany | phone: ++49 +30/39006-174
-------------------------------------------------------------------------
Date: Wednesday, 27 Jan 1993 16:03:38 EST
From: <RRATEICK@vma.cc.nd.edu>
Newsgroups: sci.materials
Subject: AA2219 aluminum crack growth rates

I am trying to locate fatigue crack growth data for AA2219, preferably in
the T851 temper, for the S-L orientation.  Any help would be greatly
appreciated.

RICK RATEICK
UNIVERSITY OF NOTRE DAME
RICHARD.G.RATEICK.1@ND.EDU    RRATECK@IRISHVMA.BITNET
From: hj418ma@unidui.uni-duisburg.de (Andre Mack)
Newsgroups: sci.materials
Subject: High temperature synthesis
Date: 26 Jan 1993 11:13:38 +0100
Organization: Universitaet Duisburg GH
Distribution: y
NNTP-Posting-Host: unidui.uni-duisburg.de
Summary: High temperature synthesis
Keywords: High temperature synthesis

Hello,

I am looking for some information and references on 
SHS (self-propagating, high temperature synthesis) processes. 
Many thanks in advance.


Andre' Mack

----------------------------------------------------------------------------
Andre' Mack                             Tel.: +49 203 379 3427
Universitaet Duisburg                   Fax : +49 202 379 3087
Verbrennung & Gasdynamik
Lotharstr. 1                            e-mail: hj418ma@fire2.uni-duisburg.de
4100 Duisburg 1
Germany
Date: Sunday, 24 Jan 1993 00:38:19 EST
From: <RRATEICK@vma.cc.nd.edu>
Newsgroups: sci.materials
Subject: Re: Preferred orientation in thin film growth - papers?


Daniel Bergstrom (berg@uxa.cso.uiuc.edu) writes:

>I am studying the development of microstructure in sputtered metallic films.
>In particular I'm looking into how a preferred orientation of the crystal
>arises during growth. [...] Does anyone know any good papers in this area or
>related areas?

Without being insulting, have you tried "crystallographic texture"
"pole figure", or "orientation distribution" as key words?

Sounds like we are at similar stages in thesis research.  I
am investigating various texture determination methods for the analysis
of bulk titanium aluminide alloys.  A recent review may be of use to you
D.J. Dingley, V. Randle, "Review Microtexture Determination by Electron
Back-Scatter Diffraction", J. Matl. Sci., [27] 4545-4566 (1992).  Sampling
volume might be a problem with thin films?  Also, X-ray methods are used
with bulk materials.  If you have access to a texture goniometer with a thin
film attachment (I have only heard of these, Rigakku makes one, I think),
perhaps this may be able to do the job.  Color metallography may provide a
qualitative means of determining texture (G.F. Vander Voort, "Tint Etching",
Metal. Progr. March 1985, 31-41.)

A book on orientation distribution functions (a powerful way of quantifying
texture data) is available: Quantitative Texture Analysis, H.J. Bunge,
C.Esling, eds., DCM Metallurgy Information.  It is now on sale for
$28.00, call 212-679-0782.  Save the cheep binding, it looks like a good
introductory book.

By the way, I tried to reply via e-mail.  Your system bounced the messages.


RICK RATEICK
UNIVERSITY OF NOTRE DAME
RICHARD.G.RATEICK.1@ND.EDU    RRATECK@IRISHVMA
Newsgroups: sci.materials
From: bli@uwovax.uwo.ca
Subject: MECHANIC AN MATERIALS ENGINEER
Organization: University of Western Ont, London
Date: Thu, 28 Jan 1993 01:24:27 GMT

Dear Sir/Madam:


	As an experienced manufacturing engineer and two master degree holder,
my interests include (1) developing numerical modeling with Finite-Element 
Methods for materials failure and service life prediction; (2) numerical 
calculation for composite and polymer

	I am looking for an Application Programmer/Analyst position in R&D 
department in a fast developing company. The following is my resume. Please 
contact me at (205)821-0685 or leave message. Thank you.

_____________________________________________________________________________ 
	THE DEGREES BE CONFERRED:

	M.S. Mechanical Engineering/Materials  Engineering, expected  2/93
        M.S. Engineering Mechanics,  2/88		
	B.S. Applied Mathematics,    7/85



	EXPERIENCE:

	2/88-- 3/91 	
	Manufacturing Engineer in SAMIC company
	CFD and CAD in wing design. 
	
	8/91 -- 12/91
	Research Associate, Dept. of Mechanical and Aeronautical Engineering.	
	Phase flow and Lagrange mean flow.
							
	1/92 -- present: 
	Research Assistant, Dept. of Mechanical Engineering			
	Mechanical properties of materials, polymer research and finite element
	analysis(FEA).
	


	EXPERTISE:

	CAD, FEA(ANSYS,Nastran), FORTRAN, PASCAL,C ,  IBM4381/MVS,
	SunStation/Unix, PC/MS-DOS, Machintosh, Honeywell/DPS.


Newsgroups: sci.materials
From: weber@jedi.ssd.lmsc.lockheed.com (Kevin Weber)
Subject: Re: Looking for a source for Ni mesh
Followup-To: sci.materials
Organization: Lockheed Missiles & Space Co.
Date: Mon, 25 Jan 93 15:46:47 GMT

In article <1993Jan20.001614.26900@nuscc.nus.sg>, cheleejy@nuscc.nus.sg
(Lee Jim Yang (Dr)) wrote:
> 
> In article <weber-190193073220@129.197.66.35> weber@jedi.ssd.lmsc.lockheed.com (Kevin Weber) writes:
> >In article <1993Jan18.085336.1819@nuscc.nus.sg>, cheleejy@nuscc.nus.sg (Lee
> >Jim Yang (Dr)) wrote:
> >> 
> >> I am looking for a cheap source of Ni mesh, the kind that is used in
> >
> >Try these:
> >
> >Unique Wire Weaving Co.
> >201-688-4600


FAX  909-688-4601



> >Chomerics
> >800-842-1134


FAX   617-933-4318



good luck

kevin
From: potti@gn.ecn.purdue.edu (Shyam V. Potti)
Newsgroups: sci.materials
Subject: Polymers, Composites, Other Materials and their Processing.
Keywords: SAMPE
Date: 23 Jan 93 18:11:57 GMT
Distribution: in
Organization: Purdue University Engineering Computer Network


INTERESTED IN POLYMERS, COMPOSITES, OTHER MATERIALS, AND THEIR PROCESSES ?

Plan on attending the callout for the Society for the Advancement of Materials
and Process Engineering (SAMPE) !!

This society focuses on materials, their applications, and specific production
methods.  Students and professionals in Chemical, Mechanical, Materials,
Aerospace Engineering and Technology and Chemisty form this interdisciplinary
organization.  Membership in this society would provide increased interaction
with other disciplines which is becoming crucial in today's workplace.

A callout for interested students is being held Tuesday, January 26 at 6:00 pm
in Mechanical Engineering Building, Rm 261, Purdue University.  

BONUS :  Free Pizza and Pop served at the callout !!
From: wbdst+@pitt.edu (William B Dwinnell)
Newsgroups: sci.crypt
Subject: Re: (finding) HUGE primes
Date: 21 Jan 93 13:05:38 GMT
Organization: University of Pittsburgh


But is it a monte Carlo algorithm or a Las Vegas algorithm?
Newsgroups: sci.crypt,alt.radio.scanner
From: mjohnsto@jenny.shearson.com (Mike Johnston)
Subject: Re: AT&T news release
Organization: Lehman Brothers
	<neal.727712295@hp536>
Distribution: usa
Date: Fri, 22 Jan 1993 18:43:35 GMT

In article <neal.727712295@hp536> neal@hp536.even.ge.com (U-E59382-David Neal) writes:
   >Reminds me of a programming class in college.  Our teacher
   >held up a foot long piece of wire and said, "Does anybody
   >know what this is?" [stuff deleted]
   > *This* is a nanosecond!"
   >-- 
   Lest we forget, this is Lt. Commander (correct rank?) Grace Hopper's
   trademark. Many of us, I'm sure, still treasure the 'nanoseconds' she
   distributed at her public appearances.

Lest we ALSO not forget that she's buried six nanoseconds down.

8-)

MJ
--
Michael R. Johnston, System Administrator	mjohnsto@shearson.com
"The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man." - G.B. Shaw
Newsgroups: sci.crypt
From: jebright@magnus.acs.ohio-state.edu (James R Ebright)
Subject: Re: Tropez Digital Cordless Phone Encrypted?
Organization: The Ohio State University
Date: Wed, 27 Jan 1993 09:25:27 GMT

In article <1993Jan26.180913.25305@hubcap.clemson.edu> wstef@hubcap.clemson.edu (W. Gregg Stefancik) writes:
>I have a Tropez 900DX corless phone which uses some form of digital
>voice transmission.  From reading the manual I see that the digital
>stream is supposed to be encrypted as well.  Does anyone know how this
>phone does it's thing?  Supposedly it uses one of 64K keys which it
>randomly selects each time it is being charged.
>
...deletion...

I don't know about this specific model, but in general this
class of phone is much superior to the regular fm cordless
phone.  All you can hear is the digital hash when listening. 
These phones also usually do frequency hopping, but normally in
response to noise and not for security.

But be careful, many of these phones claim to be encrypted --
but close examination of the claim shows the manufacter believes
digitization is encryption.  (This Tropez might be different)

NB. In the US, it requires *no* court order to tap your cordless
phone.  If you want to broadcast in the clear, anyone who wants
to can listen.

-- 
		Jim Ebright (james.ebright@osu.edu) 
		   Heisenberg may have been here.
    Fax # 614-785-0292.  Tel # 614-785-0282.  Beeper # 614-646-1093
     >>>    All kids can be educated -- even yours and mine.    <<<
Newsgroups: sci.crypt
From: rdippold@qualcom.qualcomm.com (Ron Dippold)
Subject: Re: Wanted: very fast random number generator
Organization: Qualcomm, Inc., San Diego, CA
Date: Wed, 27 Jan 1993 01:12:54 GMT

tgl+@cs.cmu.edu (Tom Lane) writes:
>What I need is a very very fast random number generator; it does NOT need to
>be cryptographically strong.  The application is in generating random noise
>for dithering a color image.  I need about 8 random bits on each call
>(randomness of the low order bits is less important than the higher).
>Ideally it would take, say, just a shift and XOR per value.  The code has to
>be portable C, so circular shifts and other non-C operations are out.

Sounds like what you want may be a PN generator.  I don't have any
references on them, but that's a start.  They're very fast, they're
_almost_ random by all the usual tests, they're just slick.  It's been
a while since I did them in software rather than hardware, but here's
the basic loop, I believe:

	unsigned int pn;

	if( pn & 1 == 1 ) {
	  pn = ( ( pn >>1 ) ^ mask ) | 0x8000;
	} else {
	  pn >>= 1;
	}

0x8000 assumes that it's a 16-bit PN register.  You can adjust this to
anything you want.  The mask is the crucial part.  The length of the
sequence depends on the value you use for the mask and the initial
value of pn.  Eventually the sequence will repeat again.  The number
of iterations before that happens is the PN sequence length.
Obviously you don't want a length that's too low.  Nor do you ever
want a value of 0 in your pn register, or it'll never change.

In most applications (hardware) you actually use the bottom bit of the
pn sequence as your random output.  There shouldn't be any problem,
however, with using, say, the lower 8 bits for your application.
Another method (though somewhat costly in software) is to xor all the
bits in the register together - again this produces a one bit serial
output.

Usually, the bigger the register the longer the sequences - my code
above is for the PC and assumes a 16-bit size.  If the computer you're
going to be running this on will do 32-bit just as easily or almost as
fast you might consider a 32-bit sequence, which should run from here
to eternity.  As to which sequence to use, I'm sure there's some
published, but I don't have any good ones handy.  May I suggest brute
force?  Just chug along until you find one that's sufficiently long
for your needs.  

For a 16-bit PN register, if you use a mask of 0xfff6 and a non-zero
starting value in the register with the above code you get a pn
sequence that runs through every possible value value in the pn
register (except 0)!  I believe there is such a mask for any size
register...  And now you also know an excellent way to do pixel by
pixel "random" fades from one picture to another.

-- 
What passes for woman's intuition is often nothing more than man's transparency
Newsgroups: sci.crypt,sci.math
From: strnlght@netcom.com (David Sternlight)
Subject: Re: Oh yeah?  Factor this...
Organization: Netcom - Online Communication Services (408 241-9760 guest)
Distribution: na
Date: Thu, 21 Jan 1993 20:50:45 GMT

In article <1993Jan21.011510.24294@linus.mitre.org> bs@gauss.mitre.org (Robert D. Silverman) writes:
>In article <1993Jan20.232616.5748@zip.eecs.umich.edu> gilgalad@quip.eecs.umich.edu (Ralph Seguin) writes:
>:
>27392450308603031423410234291674686281194364367580914627947367941608692026226993634332118404582438634929548737283992369758487974306317730580753883429460344956410077034761330476016739454649828385541500213920807
>:
>:Can you factor this number [in your lifetime]?  If so, you may be
> 
>What is the source for this number? Is it a random integer? Is it
>an RSA number, constructed as the product of nearly equal primes?
>If the latter it is out of current computational range.

(Correcting a previous post)
Couldn't you take the approximate square root of the number, truncate the
result, and then start searching up and down from there if the number is the
product of two nearly equal primes?

David
-- 
David Sternlight
RIPEM Public Key on server  --  Consider it an envelope for your e-mail

Newsgroups: sci.crypt
From: pc123@cus.cam.ac.uk (Pete Chown)
Subject: References for number field sieve (was Re: Oh yeah?  Factor this...)
Organization: U of Cambridge, England
	<1993Jan22.004018.2036@csi.uottawa.ca>
	<1993Jan22.013643.10520@linus.mitre.org>
Distribution: na
Date: Fri, 22 Jan 1993 19:28:07 GMT

In article <1993Jan22.013643.10520@linus.mitre.org> bs@gauss.mitre.org (Robert D. Silverman) writes:

   The Number Field Sieve [on some reasonable unproved assumptions] takes
   exp( (c + o(1))  (log N)^1/3  (log log N)^2/3)
   with c ~ 1.91

Does anyone have a reference for any articles or books on the number
field sieve?  I would quite like to see how they have done it.

(perhaps it's best to reply by email, and I'll summarise to the net if
anyone tells me that this is of general interest)
--
---------------------------------------------+ "A tight hat can be stretched.
Pete Chown, pc123@phx.cam.ac.uk (Internet)   |  First damp the head with steam
            pc123@uk.ac.cam.phx (Janet :-)  -+  from a boiling kettle."
Newsgroups: sci.crypt
From: hrubin@pop.stat.purdue.edu (Herman Rubin)
Subject: Re: random number generation
Organization: Purdue University Statistics Department
Date: Thu, 28 Jan 1993 13:54:23 GMT

In article <ve9gucs@sgi.sgi.com> rpw3@rigden.wpd.sgi.com (Rob Warnock) writes:
>drake@Autodesk.COM (Dan Drake) writes:
>+---------------
>| Measure the time between successive particles detected by the counter.
>| Remember it.  Measure the time between the next two.  If it's less than
>| the first, generate 0; if more, generate 1; if the same, within your
>| means of measurement, drop it and try again.  Repeat as necessary.
>| 
>| If the half-life of your source is long enough (exercise for the
>| reader), the bias towards 1-bits will not be measurable.
>+---------------

>Well, if you simply reverse your 1/0 selection rule after every bit
>generated...

How accurately can time be measured?  How much does the dead time history
affect the results?  One can probably do better by counting the number of
events in a sufficient period; here dead time, up to an appropriate point
depending on the distribution of dead time relative to the decay rate,
is even an advantage.
-- 
Herman Rubin, Dept. of Statistics, Purdue Univ., West Lafayette IN47907-1399
Phone: (317)494-6054
hrubin@snap.stat.purdue.edu (Internet, bitnet)  
{purdue,pur-ee}!snap.stat!hrubin(UUCP)
From: jpw@cbis.ece.drexel.edu (Joseph Wetstein)
Newsgroups: sci.crypt
Subject: Re: History of cryptography -- references sought
Keywords: history
Date: 21 Jan 93 19:47:30 GMT
Organization: Drexel University, College of Engineering, Philadelphia, PA

In article <C0xr4z.MuM@demon.co.uk> gtoal@pizzabox.demon.co.uk (Graham Toal) writes:
>In article <adrian.727124671@milton> adrian@milton.u.washington.edu (Adrian Mariano) writes:
>:I am looking for books or chapters of books which discuss in any way,
>:the history of cryptography.  I want examples of uses of cryptography
>:in the past, or examples of methods of cryptography that were used in
>:the past.  
>:
>:I currently have
>:    The Code Breakers by David Kahn
>:    The Puzzle Palace by James Bamford
>:on my list.  
>:
>:Can anyone suggest other references?
>
>There's a popular biog of Alan Turing that has a couple of interesting bits,
>if you can wade through the turgid style of the rest of it, and the author's
>obvious axe-grinding about sexual politics.
>
>G

It's called Turing - The Enigma. And I agree with the statement above.

jw
Newsgroups: sci.crypt