HDTenEightyP/NetNews huggingface dataset:
From: aalpern@hamp.hampshire.edu
Newsgroups: sci.fractals
Subject: Re: Henon-Heiles system
Date: 28 Jan 93 19:37:42 GMT
Organization: Hampshire College
NNTP-Posting-Host: hamp.hampshire.edu

In article <C1Ktxn.4D3@acsu.buffalo.edu>, proy@acsu.buffalo.edu (Partha Roy) writes:
> 
> 
> 
> Someone mentioned the Henon-Heiles system.  Can we get some more
> info. on this.
> 
> P.R

OK, I see there is some demand for this stuff, and well there should be., As
with the Henon and standard map code that I posted earlier, the code for
Henon-Heieles can be found the Fall 1992 issue of the COmputer music Journal.
I will post the code, once again, as soon as I can run home and get it, 
expect it later this evening. 

	One of the most intersting things I discovered about the Henon-Heieles
system is that, when iterpreted musically, it produce some very Latin sounding
polyrhyhtms! btw, the HH system is a simplified model for the motion of a star
within a galactic gravitational field.

-Adam
aalpern@hamp.hampshire.edu
Newsgroups: sci.fractals
From: z98t@jupiter.sun.csd.unb.ca (Vijay Parsa)
Subject: Program to compute lyapunov exponent of a time series
Organization: University of New Brunswick, Fredericton, NB, Canada
Date: Wed, 27 Jan 1993 06:13:06 GMT

Hi netters,
Does anybody have a program to compute lyapunov exponent of a time series? Any
pointers to such program would be helpful.

Thanks in advance.

Vijay Parsa
From: shirriff@sprite.berkeley.edu (Ken Shirriff)
Newsgroups: sci.fractals
Subject: Re: Fractal FAQ (assembly in Xfractint?)
Date: 20 Jan 1993 23:19:46 GMT
Organization: University of California, Berkeley
NNTP-Posting-Host: hijack.berkeley.edu

In article <AV.93Jan20131744@kielo.uta.fi> av@uta.fi (Arto V. Viitanen) writes:
>Does X/Fractint use assebler code on Intel based Unix machines ? If not, has
>anybody tried to do this ?

Xfractint is entirely C code.  I suppose you could try using assembler code.
However, I would recommend doing timings before putting much effort into
it.  On my machine, a float multiply takes about twice as long as an int
multiply.  So, after you factor in the shifting and so forth required to
multiply two ints with an implicit scale factor, you don't really win.
(Of course, if you don't have a floating point unit, then ints will win.)
Also, the main cause for slowness in Xfractint is drawing pixels through X,
and the assembly code won't help there.

If anyone tries using assembler code for xfractint, please let me know how
it turns out.

Ken Shirriff			shirriff@sprite.Berkeley.EDU
From: WAJ@psuvm.psu.edu
Newsgroups: sci.fractals
Subject: chaotic modelling
Date: 24 Jan 93 21:45:11 GMT
Article-I.D.: psuvm.93024.164511WAJ
Organization: Penn State University

I have recently begun experimenting with modelling of chaotic systems in
C++. The only system I have had success with is the Lorenz water wheel
(as found in James Gleick's Chaos). Does anybody know of any other fairly
simple physical systems which exhibit chaotic behavior?
(btw, if anybody wants to see the wheel, i could send it)
thanks

Bill Jester
Newsgroups: sci.materials
From: zadeh@cs.uow.edu.au (Hossein Sarrafzadeh)
Subject: effects of inclusion in high alloy steels (help please)
Summary: looking for general references on the effect of inclusion on high
Keywords: inclusion high alloy steels
Organization: Dept of Computer Science, Wollongong University, Australia
Date: Thu, 21 Jan 1993 22:20:47 GMT

Hi everyone,

I need refernces on the general topic of:

       effects of inclusion on high alloy steels.

Any pointers to references or groups or individuals working
on the topic would be greatly appreciated.

Thanks,

Zadeh
Newsgroups: sci.materials
From: peby@champlain.UVic.CA (Paul  Eby)
Subject: amorphous metals
Reply-To: peby@champlain.UVic.CA
Organization: University of Victoria, Victoria, BC, Canada
Date: Wed, 27 Jan 93 20:41:59 GMT


I am researching amorphous rare-earth/transition metal alloys, but have no equipment or expertise in manufacturing them or testing their magnetic properties.  If you know of someone who does, or are yourself interested, send an e-mail message.  Perhaps a 'mutually benificial arrangement' can be negotiated.

Paul Eby
Cryofuel Systems
University of Victoria 
Newsgroups: sci.materials
From: gawne@stsci.edu
Subject: Re: Selecting a plastic for a calculator
Followup-To: sci.materials
Organization: Space Telescope Science Institute
Distribution: na
Date: Wed, 27 Jan 1993 23:22:07 GMT

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.

and Kevin Weber replied: 
> 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.

[With much more good information about polymers deleted.]

I *think* that Gerald needs information about the actual electronics of his
proposed calculator as well as the case material.  I'd guess that for a 
variety of reasons he's going to have to use Silicon (unless its for DoD,
in which case he can make it out of GaAs with a gold foil liner inside of
a radiation hardned case!).  Information about Si is available just about
anywhere, so there shouldn't be any problem finding out about the crystal
structure.

The other possibility is that whoever assigned this paper is enough of a 
goof not to know about the amorphous properties of plastics and polymers.

-Bill Gawne,  Space Telescope Science Institute
Newsgroups: sci.materials
From: tony2@prefect.cc.bellcore.com (gozdz,antoni s)
Subject: Re: Amorphous diamond film
Organization: Bellcore, Livingston, NJ
Date: Mon, 25 Jan 93 21:47:55 GMT

In article <C1F58B.MF4@brunel.ac.uk> mt90dac@brunel.ac.uk (Del Cotter) writes:
>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      |    ', ,','  


I think you mean "amorphous diamond-like films", a.k.a.
"hydrogenated amorphous carbon", "alpha-C:H", etc.

In thin layers, i.e., 50-500 nm, they can be
transparent with yellow-to-brown tint, but depending on
the deposition conditions, either almost clear or
metallic-looking films can also be made.

They are easily deposited by high-frequency discharges
(100 kHz - 2.45 GHz) from any hydrocarbon gas at rather
low pressures (0.001 - 10 Torr).

They are VERY hard (8-9 on the Mohs' scale (Si is 7,
various carbides 8-9, diamond 10), VERY smooth,
electrically insulating, chemically resistant,
hydrophobic, are very good gas transport barriers, etc
etc. Fun to work with, too.

People have used such films for tool, lens, and optical
fiber coatings, medical implant coatings, transfer layers 
in high-resolution lithography, to fabricate 
ultraminiature stressor elements in quantum structure 
studies, etc. There is a CRC book on the subject.

Hope it helps.

Tony
tony2@cc.bellcore.com
Newsgroups: sci.materials
From: tony2@prefect.cc.bellcore.com (gozdz,antoni s)
Subject: Re: Why don't glues work
Organization: Bellcore, Livingston, NJ
Date: Sat, 23 Jan 93 21:57:22 GMT

In article <1993Jan23.015748.5837@athena.mit.edu> hkon@athena.mit.edu (Henry Kon) writes:
>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 ? 
>--
>Henry Bruno Kon

You've just found a problem many industrial researchers
have been trying to solve for a long time. A very short
answer to your question is: there are no wonder glues
(or adhesives, as those familiar with the art prefer to
call them) that would bond any pair of materials.
Many popular plastics/polymers (such as polyethylene,
polypropylene, Teflon(tm)) just don't have any
functional groups that would react with a glue to form
a chemical bond. Their surface must be activated,
physically roughened, or, what's most effective, two
parts are just melted/sintered to form a joint.

Tony
tony2@cc.bellcore.com
Newsgroups: sci.materials
From: rgibson@cipres.cec.uchile.cl (GIBSON MARTICORENA ANDRES)
Subject: Hot Rolled Lead Calcium tin Anodes
Originator: rgibson@araucaria
Date: Fri, 22 Jan 1993 16:34:12 GMT
Distribution: sci.materials
Organization: Centro de Computacion (CEC), Universidad de Chile

iI am looking for Information Related to Hot rolled lead calcium tin anodes
used for electrowinnig process of copper.

Would also thanks address of research center studing this topic. (FTP)
From:  (Darin S. Olson)
Newsgroups: sci.materials
Subject: Re: Amorphous diamond film
Date: 25 Jan 93 22:34:29 GMT

In article <C1F58B.MF4@brunel.ac.uk>, mt90dac@brunel.ac.uk (Del Cotter) writes:
> 
> 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?
> 
> -- 

OK, I'll bite as an expert in Diamond.  

First off there can not be such a thing as amorphous diamond.  You probably
realize this, but just in case: Diamond is a crystal therefor can not be 
amorphous.  Amorphous diamond comes about due to amorphous silicon, which
does exist.  The correct term would be amorphous sp3 carbon, to distinguish
it from amorphous sp2 carbon (ie: soot).  

I don't know if truely amorphous sp3 carbon can, or does exist.  If someone
claimed to have made it I'd be very heavy with the salt.  Amorphous or nano-
crystalline films have been made with large amounts of sp3 bonding.  These 
films are often called Diamond-Like Carbon (DLC) and have a wide range of 
properties.  DLC is generally produced under the same conditions as a diamond
thin film, but for some reason the experiment missed the sweet spot of diamond
deposition.  The closer to the sweet spot of diamond deposition the more
diamond like the material is.

As such these DLC films have their properties largely dominated by defects 
(carbon bonds left un-bonded, impurities, hydrogen contanination, etc).  
The term diamond-like comes from their mechanical properties, which approach
those of diamond, while the electrical and optical properties are much 
poorer.  In general a DLC film is black.  

If one could make a truely amorphous sp3 carbon film I'd expect it to be clear,
like diamond except that the band-gap would probably be compressed due to 
the disorder.  I'm sure someone could do a quick and dirty calculation of the 
band gap of amorphous sp3 based on the band gap of amorphous silicon.  Compress
the band gap enough and the film will absorb blue light.  However, this assumes
one could make a defect free amorphous sp3 carbon film.

As for amorphous carbon films (a-C) in general one of the easiest production 
techniques is sputtering of a graphite target.  If one adds hydrogen to the 
sputtering gas one gets amorphous carbon stabalized with hydrogen (a-C:H), add
nitrogen (a-C:N), etc.  This allows a whole recipe of different amorphous carbon
films with different mechanical optical and electrical properties.  Although
such films are used by the disk drive industry as a hard protective coatings
I suspect there are many other applications which have yet to be developed.  

I hope this satisfys your quiery.

Darin S. Olson
R & DD 
LMSC
Palo Alto CA
From: mch@anu.edu.au (Mick Cardew-Hall)
Newsgroups: sci.materials
Subject: Manufacturing Process Modelling
Date: 22 Jan 1993 05:27:56 GMT
Organization: Interdisciplinary Engineering Program, ANU, Australia
Distribution: world
Reply-To: mch@anu.edu.au
NNTP-Posting-Host: 150.203.45.16


HI

I have just arrived in Australia from the UK. I'm particularly interested in finding out
who is interested in the area of  modelling of manufacturing processes, particularly
casting and forging and in particular within Australia. 

I have a fair idea of what is going on in the UK , Europe and bits of the US but I want to
hear from ANYBODY ANYWHERE who has an interest.

I'll compile a list and mail it to those that drop me a line.


Thanks 


Mick Cardew-Hall
Engineering Program
Australian National University
GPO Box 4
Canberra
ACT
AUSTRALIA

Tel:   06-2490330
fax:   06-2490506
email: mch@faceng.anu.edu.au


Xref: sparky sci.materials:1198 sci.math:18847 sci.research:1479
From: jimmosk@eniac.seas.upenn.edu (Jim J Moskowitz)
Newsgroups: sci.materials,sci.math,sci.research
Subject: Science Fair JUDGES WANTED [repost]
Date: 27 Jan 93 15:36:56 GMT
Followup-To: sci.materials
Distribution: pa
Organization: University of Pennsylvania


   The Delaware Valley Science Fairs are seeking research-experienced
scientists, engineers, and technologists willing to volunteer one (1) day to
help one of the most important science education programs in the Delaware
Valley.  The 1993 DVSF will be judged Thursday, April 1st, 1993 at the
Philadelphia Civic Center.  Judging requires a full day.  Criteria for
evaluating science projects will be provided (as will breakfast and lunch).
   Contact with student scientists in a Science Fair is an interesting
experience for scientists or technicians with training and recent experience
in any field of medicine, science, or engineering.  To volunteer as a
Science Fair judge, contact:

Dr. Lee Bennett
The Franklin Institute
Franklin Parkway at 20th St.
Philadelphia PA  19103
(215) 448-1269

or email your name and mailing address to jimmosk@eniac.seas.upenn.edu

--
_______________________________________________________________________________
Jim Moskowitz                   "All you can logically say about 
jimmosk@eniac.seas.upenn.edu     a guy who thinks he's a poached egg
                                 is that he's in the minority." - James Burke
Newsgroups: sci.materials
From: kcj@dptspd.sat.datapoint.com (Kevin Jones)
Subject: Interesting Material
Organization: Datapoint Corporation, San Antonio, TX
Date: Thu, 21 Jan 1993 19:13:19 GMT

Do any of you have any infomation on the physical properties of Lithium BeryliumNitride crystals?  Any information would be greatly appreciated.

Newsgroups: sci.materials
From: senguptas@woods.ulowell.edu
Subject: Re: Source for ITO coated plastic film
Organization: University of Lowell
Date: Tue, 26 Jan 1993 21:19:08 GMT


Hi, 
   I am looking for a source for small quantities of a flexible transparent
polymer film, coated with indium-tin-oxide (ITO) or a similar transparent
 conductive coating.  This would be similar to the material used in LCD
displays or electroluminescent lamps.
Thank you for your help.

Sincerely,

Sandip

Sandip Sengupta
senguptas@woods.ulowell.edu

Newsgroups: sci.materials
From: gambit@uxa.cso.uiuc.edu ()
Subject: Re: DataBase for Metallurgical Processing
Organization: University of Illinois at Urbana
Date: Mon, 25 Jan 1993 05:18:05 GMT

In article <106224@netnews.upenn.edu> jin@sol1.lrsm.upenn.edu (Xuegen Jin -Luzzi) writes:
>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
>
>

Me too! :)

------------------------------------------------

Benjamin W. Lagow
Grad Res Asst, Dept. of Materials Science and Engineering
University of Illinois at Urbana-Champaign
Newsgroups: sci.materials
From: solman@athena.mit.edu (Jason W Solinsky)
Subject: Archive
Organization: Massachusetts Institute of Technology
Date: Wed, 27 Jan 1993 21:03:50 GMT

Does anybody know is there is an archive of this group?

Thanks.

Jason W. Solinsky
Newsgroups: sci.materials
From: rgibson@cipres.cec.uchile.cl (GIBSON MARTICORENA ANDRES)
Subject: Looking for Information related ...
Originator: rgibson@araucaria
Date: Fri, 22 Jan 1993 16:48:53 GMT
Distribution: sci.materials
Organization: Centro de Computacion (CEC), Universidad de Chile

.

  I am lokkinoking for information related to HOT ROLLED LEAD CALCIUM TIN ANODES
  used for electrowinnig process of copper.
	
	Would also thanks address of research center studing this topic (FTP?)

	Andrwew Gibson
	Univ. of Chile
From: mt90dac@brunel.ac.uk (Del Cotter)
Newsgroups: sci.materials
Subject: Re: Amorphous diamond film
Keywords: crystalline amorphous carbon diamond sp2 sp3
Date: 27 Jan 93 13:12:08 GMT
Organization: Brunel University, West London, UK

Darin S. Olson writes:
>First off there can not be such a thing as amorphous diamond.  You probably
>realize this, but just in case: Diamond is a crystal therefor can not be 
>amorphous.  Amorphous diamond comes about due to amorphous silicon, which
>does exist.  The correct term would be amorphous sp3 carbon, to distinguish
>it from amorphous sp2 carbon (ie: soot).  

Thank you.  This is exactly the context in which the question came up.
Our lecturer listed:

Graphite			sp2
Amorphous carbon (soot)		sp2 (some sp3)
Diamond				sp3

and we said 'What about sp3 (some sp2)?'
and he said 'Ah! That's amorphous diamond'

Which as you say, sounds like a contradiction in terms.

Thanks also to antoni s gozdz and all who have mailed me; this undergrad's
curiosity is satisfied (for now!).
-- 
 ',' ' ',','  |                                                  |  ',' ' ',','
   ', ,','    |       Del Cotter       mt90dac@brunel.ac.uk      |    ', ,','  
     ','      |                                                  |      ','
From: gwalsh@kilroy.Jpl.Nasa.Gov (Gerald J. Walsh)
Newsgroups: sci.materials
Subject: Selecting a plastic for a calculator
Date: 27 Jan 1993 17:13:36 GMT
Organization: Jet Propulsion Laboratory, Pasadena, CA
Distribution: world
NNTP-Posting-Host: kilroy.jpl.nasa.gov


Hi There,

I have been assigned the task of writing a term paper (for school)
about selecting the proper material for building a hand held computer
or calculator.  This is for a Material Science and Engineering course.
I'm just getting into the research phase and gathering all the latest
magazine articles, etc.

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.

I'm not asking for someone to do the report for me, but I thought
this (news) would be one of the best sources of the latest happenings
in the Materials field.

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?

Thanks very much for your help!


Gerald J. Walsh                     | Internet: gwalsh@kilroy.Jpl.Nasa.Gov
Jet Propulsion Laboratory           | Phone   : (818) 354-3913
RF and Microwave Subsystems Section | Fax     : (818) 354-2825
M/S 238-528                         | 
4800 Oak Grove Drive                | 
Pasadena, CA  91109                 |
From: hyland@ac.dal.ca
Newsgroups: sci.materials
Subject: mag tapes
Date: 27 Jan 93 18:19:15 -0400
Organization: Dalhousie University, Halifax, Nova Scotia, Canada

7
I am hoping to find a way of making magnetic recordings permanent, mag strips on bank cards, tapes etc.

A friend of mine has a bank card, the mag strip of which he accidentally made permanent, i.e. that the info magnetically encoded on the back could not be changed. 

I was hoping to do the same to magnetic recording tapes.

If you have any info or if you know where to find the info your help would be greatly appreciated.

Please post or E-mail    hyland@ac.dal.ca
unread document(s) in this selection?-:LaserWriter
Newsgroups: sci.materials
From: jarmala@pcuf.fi (Ari J{rm{l{)
Subject: Re: Help me find Wood's Metal, please. 
Organization: The PC-users of Finland
Date: Sun, 24 Jan 1993 22:39:18 GMT

>    Question is, where can I get Woods Metal?   I called a stained
>glass place, a fire sprinkler company (they use glass fusible
>links now), a welding supply company, and consulted our machine
>shop.  No luck. ANY helpful suggestions would be most welcome!
 
If you cannot find anyone selling it why don't you prepare it
yourself? CRC Handbook of Chemistry and Physics lists Wood's metal
to be (m.p. 70 C)
 
   Bi  50   %
   Pb  25   %
   Sn  12.5 %
   Cd  12.5 %
 
The cadmium in it would make me to hesitate... Would Newton's
metal do (m.p. 97 C):
 
   Bi  50   %
   Sn  18.8 %
   Pb  31.2 %
 
---------------------------------------------
Ari Jarmala (the three 'a's are umlauted),
     o             o
at 60 19'49" N   24 18'38" E
---------------------------------------------
From: bozek@ecs.umass.edu
Newsgroups: sci.materials
Subject: Electrical insolator with good thermal conductivity
Date: 27 Jan 93 11:59:18 GMT

We are presently looking for a material that will be used to
attach solar cells to an aluminum substrate. Cell efficiency
decreases as the cell temperature increases. Films such as
Tefsel and Tedlar are commonly used. These exibit good electrical
insolation, but low thermal conductivities.

any recommendations would be greatly appreciated.

David Bozek  bozek@umaecs.edu
Dept. of Mechanical Engineering
Univ. of Massachusetts-Amherst
From: doherty@access.digex.com (Kevin Doherty)
Newsgroups: sci.materials
Subject: Re: Electrical insolator with good thermal conductivity
Date: 27 Jan 1993 21:43:10 -0500
Organization: Express Access Online Communications, Greenbelt, MD USA
NNTP-Posting-Host: access.digex.com

  How about passivating your aluminum panel surface with thin film
diamond?  Thermal conductivity near room temperature is five times
that of copper, and it's a very good insulator.

  Barring that, a diamond filled epoxy would probably do the trick.
They use industrial diamond (abrasive grade) so the cost isn't too
outrageous.
Organization: SAS Institute Inc.
Date: Fri, 22 Jan 1993 11:33:24 EST
From: <SNOSZB@vm.sas.com> (Sanjeev Banerjia)
Newsgroups: sci.materials
Subject: Looking for: Rajiv Singh @ Florida

I'm looking for Rajiv Singh, who I believe is on faculty at the University of
Florida (Gainesville) in the Materials Science/Engineering Department. If any-
one has his e-mail address, please send it to me.

Thanks.

_________________________________________________________________
Sanjeev Banerjia    | SAS Institute, Inc. | Cary, NC  27513
<snoszb@vm.sas.com> | SAS Campus Drive    | (919) 677-8000, x6780