HDTenEightyP/NetNews huggingface dataset:
From: lmitchel@nyx.cs.du.edu (lloyd mitchell)
Subject: Re: Newton's Method
Organization: University of Denver, Dept. of Math & Comp. Sci.
Date: Mon, 9 Nov 92 11:33:35 GMT

In article <1992Nov8.221326.11267@gagme.chi.il.us> modus@gagme.chi.il.us (Patrick M. Kane) writes:
>I recently read the book FRACTAL PROGRAMMING IN PASCAL and have a question
>relating to the generation of Newton's Method fractals.  The following code
>fragment iterates the equation z^3-1=0 :
>xsquare= x * x
>ysquare = y * y
>denom = 3 * ((xsquare - ysquare) * (xsquare - yswaure) - 4 * xsquare *
>ysquare)
>IF denom = 0 then denom = 0.0000001
>x = (2/3) * x + (xsquare - ysquare) / denom
>y = (2/3) * y - (2 * x * y) / denom
>
>This does, of course, work beautifully.  However, with my high school calculus
>skills, I am unable to understand WHY.  Could someone please e-mail or post a
>step by step explanation of each part of the above fragment?  Any help is
>appreciated.
>
>Patrick Kane

If we use z for x+iy, then Newton's method for z^3 - 1 = 0 would be:

z = z - f/f', where f = z^3 - 1 and f' is the derivative of f with respect
to z, or 3z^2 in this case.  Thus,

z = z - (z^3 - 1)/3z^2 = z - z^3/3z^2 + 1/3z^2 = z - z/3 + 1/3z^2,
z = 2/3*z + 1/3z^2.

So the first term in your x and y equations is the 2/3*z term.  To get the
1/3z^2 term, your program uses z^2/(3*|z^4|), which is the same thing.  So
'denom' is 3 times the magnitude of z^4.  xsquare - ysquare is the real
part of z^2, and 2*x*y is the imaginary part.

Kerry Mitchell
Newsgroups: sci.fractals
From: Gabriel Landini <g.landini@uk.ac.bham>
Subject: Re: Fractal music.
Date: Mon, 9 Nov 1992 11:59:54 GMT
Organization: The University of Birmingham, United Kingdom

>In article <002369c.23.720126896@ace.acadiau.ca> 002369c@ace.acadiau.ca
>(WILLIAM FREDERICK CUSTANCE) writes:
>> Sometime ago, on the C.B.C, they played a song which was generated by
>> fractals. The music was very techno, but it reminded me of:
>> circus/cartoon/classical/punk music. I was amazed when I heard it, for I had
>> only had minute knowledge of fractals as pictures.
>> All I ask is if there is a person or group that makes up this type of music,
>> and how many songs do they have?
>> I have written to the C.B.C, but have not received a response.
>
>There is a composer from Toronto (?) that does work with fractal mathematics
>applied to music--his name is Bruno Degazio.  This could be who you are talking
>about.
>
>Jason.
>------------------------------------------------------------------------------

In the Science of Fractal IMages it is shown the fractal structure of music
since it approaches a 1/f power spectrum.
Gabriel

Newsgroups: sci.fractals
From: gordon@tramp.Colorado.EDU (GORDON ALLEN R)
Subject: Re: Lorenz' Weather
Organization: University of Colorado, Boulder
Date: 12 Nov 92 15:41:36 GMT

mrmarcel@eos.ncsu.edu (MICHAEL RONN MARCELAIS) writes:

>Does anybody have the equations that Lorenz used in his old weather program? 
>It was the first time he noticed the 'sensitive to initial conditions'
>phenomenon that started research into Chaos.  The program is mentioned in the
>_Chaos_ book by Gleich (i think) but not the equations.



	dX/dt = a(Y-X)
	dY/dt = bX-Y-XZ
	dZ/dt = XY - cZ

				where a = 10
				      c = 8/3
				      b = control parameter (try 28)

			
-- 
Allen Gordon 		         *If the folly of but one of us was changed to*
Research Associate         	 *intelligence, and divided amongst a thousand*
gordon@tramp.colorado.edu   	 *toads, each would be more intelligent than  *
				 *Aristotle				      *
Newsgroups: sci.materials
From: dliu@ee.ualberta.ca (Dong Liu)
Subject: Re: Properties of titanium nitride
Keywords: Titanium nitride
Organization: Dept. of E.E., U of Alberta, Edmonton,Canada
Distribution: sci
Date: Thu, 12 Nov 1992 04:45:49 GMT

In article <JAKE.92Nov11155601@nucst6.neep.wisc.edu> jake@nucst6.neep.wisc.edu (james blanchard) writes:
>
>Since there was some response to a recent request for the properties
>of silicon nitride, I thought I'd post a similar request.  Does anyone
>have any information on the properties of titanium nitride?  I'm
>particularly interested in the strength of the material (yield
>strength, rupture strength, etc.).  Any numbers and or references
>would be helpful.
>
>   Thanks,
>--
>
>   jake blanchard -- university of wisconsin - madison
>   blanchard@engr.wisc.edu  OR   jake@nucst6.neep.wisc.edu
>

I have some good references as follows:
"Material selection for  hard coatings"
J.Voc.Sci.Tec.A 4 (6), pp.2661-2669,(1986)
  
"The deposition and film properties of reactively sputtered Titanium
Nitride" ,  R.C. Ellwanger and J.M. Towner,
Thin Solid Films 161, (1988), pp.289-304.
   
Good luck to you.
From: un025720@wvnvms.wvnet.edu
Newsgroups: sci.materials
Subject: JCPDS files..
Date: 5 Nov 92 15:28:48 GMT
Organization: West Virginia Network for Educational Telecomputing


   Could someone tell me if there is a data base/ftp site available to
access x-ray powder diffraction files?
Thanks.
Manjula Ibrahim
Newsgroups: sci.materials
From: diekman@iw.uni-hannover.de (Uwe Diekmann)
Subject: Chlor in concrete
Reply-To: diekman@iw.uni-hannover.de
Organization: Institut fuer Werkstoffkunde, Uni Hannover
Date: Fri, 13 Nov 1992 10:33:52 GMT

I have some questions concerning corrosion problems caused by Cl within containers 
made of concrete:

What kinds of chemical combinations of Cl are possible and/or typically contained in concrete ?

Is Cl soluble in the moisture of concrete ?

If it is, is it possible to have diffusion of Cl with the rest-moisture of the 
concrete to outside?

Are there any publications or references in this subject?

********************diekman@iw.uni-hannover.de*******************
* Uwe Diekmann                           Tel: INT-49-511-762-3906
* Institut fuer Werkstoffkunde           FAX: INT-49-511-762-5245
* Universtitaet Hannover
* Appelstrasse 11 A             
* W 3000 Hannnover 1; Germany
*****************************************************************

Newsgroups: sci.materials
From: jake@nucst6.neep.wisc.edu (james blanchard)
Subject: Properties of titanium nitride
Organization: /usr1/jake/.organization
Distribution: sci
Date: 11 Nov 92 15:56:01


Since there was some response to a recent request for the properties
of silicon nitride, I thought I'd post a similar request.  Does anyone
have any information on the properties of titanium nitride?  I'm
particularly interested in the strength of the material (yield
strength, rupture strength, etc.).  Any numbers and or references
would be helpful.

   Thanks,
--

   jake blanchard -- university of wisconsin - madison
   blanchard@engr.wisc.edu  OR   jake@nucst6.neep.wisc.edu
From: land.d@applelink.apple.com (David Land)
Newsgroups: sci.materials
Subject: Re: Nature of Glass
Date: 10 Nov 92 01:48:49 GMT
Followup-To: sci.materials,alt.folklore.urban
Organization: Apple TV


Glass-flow-fans,

     As children and amateur archaeologists, my brothers and I used to dig
up old bottles from a late-19th-century dump not far from our house in
Pittsburgh. Many of the bottles were warped and smashed as though they'd
been melted. None of the surrounding materials we dug up were charred, nor
were there any other indications of the kind of heat needed to melt glass
in the other stuff we dug up.

     My father (who is not a materials engineer or scientist, but just a
guy) "explained" it with the "glass is a liquid" "fact," combined with the
weight of the earth piled on top of them for around 100 years.

     Any comments?

Dave Land
Newsgroups: sci.materials
From: tome@mcs213g.cs.umr.edu (Tom Erb)
Subject: Re: Piezoelectric Materials
Date: Fri, 13 Nov 1992 15:16:57 GMT
Organization: University of Missouri - Rolla

In article <92317.170747TJR122@psuvm.psu.edu> <TJR122@psuvm.psu.edu> writes:
>Hi Everybody!  My name is Tom, and I'm a student at Penn State in Electrical
>Engineering.  I was wondering if anybody knows anything about piezoelectric
>materials.  What I want to know is if it's possible to draw out an element,
>like a strand of hair, of piezoelectric material (by any process) to obtain
>a "wire" through which you could pass a (small) current causing it to move.
>
>I know that piezos VIBRATE when they get an AC current, but if you gave it
>a DC current, would it "grow" (or "shrink") in size (and stay there)?
>
>If anybody has information on this or knows where (or from whom) I can get
>such information, I'd really appreciate it.
>
I don't know if you can do this with piezos, I don't think it would be very
easy, but they can do it with metals. What I've seen are referred to as 
biometal, and it is exactly what you described. This is an alloy that was
drawn into thin wire, but it can be stretched signifigantly. When it is
heated, possibly by a current passing through it, it returns to its original
length. 

The only supplier I know of for these is Mondo-tronics. They refer to them
as Muscle Wires and sent me a 2-page flyer on them about a year ago. I've
never ordered any as they cost quite a bit. Anyway, I'd bet they would send
you this info if you call them.
  Mondo-tronics
  2476 Verna Court
  San Leandro, CA 94577
  Phone: 800-374-5764

Have fun,

Tom Erb,
tome@cs.umr.edu

  
  San Leandro, CA 
  
r
  
w
t
r


Newsgroups: sci.materials
From: sala@eueh24.tuwien.ac.at (Cristiano Sala)
Subject: Re: Heterojunction bandstructure calculations
Organization: Institute for Microelectronics, TU Vienna, Austria
Date: Wed, 11 Nov 1992 10:44:51 GMT

>>>>> On 8 Nov 92 18:12:58 GMT, vcm@ccwf.cc.utexas.edu (V. Chandramouli) said:

V.> In article <1992Nov5.081229.2190@nntp.hut.fi> you write:
>
>  Howdy,
>
>  Does anybody know where to get simulation programs to do bandstructure
>and carrier density calculations for hetrostructures, preferably for ones
>containing several stacked quantum wells ? We have one written here in HUT, 
>but it only handles one half-well, not a set of complete wells ( a super-
>lattice) or eg. two interacting wells.
>
>  Thanks,
>           Mikko Kiviranta
>

V.> I am interested in your model -- can I have a copy of it ?

V.> For stacked quantum wells, I am aware of several papers in the 
V.> literature that describes how to calculate the band structure.
V.> If you are interested in heterostructure device simulation you should
V.> consult the software from Purdue University (Mark Lundstrom's group)
V.> called PUPHS.  This program can (I think) calculate carrier
V.> densities in a heterostructure.   If you need more information on 
V.> the contact e-mail address and bibliography please send me an
V.> e-mail (mouli@emx.cc.utexas.edu).
V.> Chandramouli.                                 mouli@emx.cc.utexas.edu
V.> ---------------------------------------------------------------------
V.> Microelectronics Research Center in the University of Texas at Austin
V.> ---------------------------------------------------------------------

This might be relevant:

Here at the IuE we are working, amongst other things, on extending our
device simulator MINIMOS to HEMTs and MODFETs. In order to have a
validation tool against which to gauge pre-release simulations, a
co-worker and I wrote a standalone self-consistent
Schroedinger-Poisson solver which can handle an arbitrary number of
heterolayers. As well as carrier densities and bandstructures, it
works out capacitance-voltage curves, has incomplete donor ionization,
exchange-correlation effects (sort of) and an educated initial guess
for single-well heterostructures. I ought to add as a caveat that the
code (well, my part of it at least) is a typical research product,
i.e. ugly, inefficient and a wonderful example of feet-first
programming. Moreover, it has been used principally to work out C-V
curves for HEMTs, and as such has not had much experience with
superlattices and/or multiple quantum wells.

Still, E-mail me if you are interested.

Cristiano



--

Cristiano Sala                                            sala@iue.tuwien.ac.at
Practice random kindness              and              senseless acts of beauty
From: bill@wsuaix.csc.wsu.edu (William E. Johns;S23015)
Newsgroups: sci.materials
Subject: Re: Get a clue.   (WAS: Re: Kryptonite bike locks)
Date: 8 Nov 92 20:00:38 GMT
Article-I.D.: serval.1992Nov8.200038.13183
Organization: Washington State University

In article <1992Nov5.221927.64689@ns1.cc.lehigh.edu> jpr1@ns1.cc.lehigh.edu (James P. Reynolds) writes:
>In article <1992Nov3.230907.4135@organpipe.uug.arizona.edu>, rperkins@astro.as.a
>rizona.edu (rachel perkins) writes:
>
>>               -just give me what for,
>>       rachel perkins =  rperkins@astro.as.arizona.edu
>>      "Chastity..the most unnatural of all the sexual perversions...."
>>                                       -Aldous Huxley
>>
>
>
>Does anyone else find this as patently offensive as I do?
>
>
>Jim


YO Jim!

A point of clarification.  This is a quote.  More properly written material
is copywrited, not patented.

To answer the hidden question, NO.

Ride Free,

Bill 
________________________________________________________________
johnsw@wsuvm1.csc.wsu.edu  prez=BIMC 
AMA #500924   DoD #00314   WMTC #0002  SR= 3
Yamabeemer fjgs1200pdr100 740GLE  KotV KotRR KotD #0001  :-)
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

There are many paths to truth.  Don't die choosing.
                                                      Zen Graffiti
From: TJR122@psuvm.psu.edu
Newsgroups: sci.materials
Subject: Piezoelectric Materials
Date: 12 Nov 92 22:07:47 GMT
Organization: Penn State University

Hi Everybody!  My name is Tom, and I'm a student at Penn State in Electrical
Engineering.  I was wondering if anybody knows anything about piezoelectric
materials.  What I want to know is if it's possible to draw out an element,
like a strand of hair, of piezoelectric material (by any process) to obtain
a "wire" through which you could pass a (small) current causing it to move.

I know that piezos VIBRATE when they get an AC current, but if you gave it
a DC current, would it "grow" (or "shrink") in size (and stay there)?

If anybody has information on this or knows where (or from whom) I can get
such information, I'd really appreciate it.

Thanx!
- Tom Rusnock
TJR122@PSUVM.PSU.EDU
Newsgroups: sci.materials
From: raghavan@eng.auburn.edu (Suresh Raghavan)
Subject: Optical sensors in welding
Reply-To: raghavan@eng.auburn.edu
Organization: Auburn University Engineering
Date: Fri, 13 Nov 1992 17:07:13 GMT


Hi Folks, 

I am working in the area of gas metal arc and submerged arc welding.  We are using an infrared sensor to monitor and control our welding path and penetration.  However, I am interested in knowing about optical sensors (visible range), and how effective they are in doing the same.  Fiber optics is also an area that I am interested in, especially in monitoring submerged arc welds.  Any information is most welcome.



Suresh
From: shiding@mse.ogi.edu
Newsgroups: sci.materials
Subject: Young's modulus and Poisson's ratio of 3M adhesives
Keywords: adhesive
Date: 10 Nov 92 17:40:17 GMT
Article-I.D.: ogicse.45601
Distribution: world
Organization: Oregon Graduate Institute

Hi there, I have used two types of 3M adhesives, which are
DP100 clear and DP190, for my adhesively bonded joint test.
Now I want to do some numerical work on this joint but I
don't know their Young's moduli and Poisson's ratios. If anyone
there knows those data or can give me an advice I will be
very grateful.

Many thanks in advance.

............................................
Shiliang Ding (Mr.)
Dept of Materials Sci and Eng
Oregon Gradute Institute
Beaverton, OR 97006-1999
USA
Tel: (503)-690-1121 x7451
Fax: (503)-690-1432
Email: shiding@mse.ogi.edu
............................................
From: f29802m@kaira.hut.fi (Mikko Sakari Kiviranta)
Newsgroups: sci.materials
Subject: Heterojunction bandstructure calculations
Keywords: Design, Materials, Processing, Education
Date: 5 Nov 92 08:12:29 GMT
Organization: Helsinki University of Technology, Finland


  Howdy,

  Does anybody know where to get simulation programs to do bandstructure
and carrier density calculations for hetrostructures, preferably for ones
containing several stacked quantum wells ? We have one written here in HUT, 
but it only handles one half-well, not a set of complete wells ( a super-
lattice) or eg. two interacting wells.

  Thanks,
           Mikko Kiviranta
From: ccjensen@fnal.fnal.gov (Chris Jensen)
Newsgroups: sci.materials
Subject: Re: Scandium and Osmium end-users
Date: 10 Nov 92 15:00:38 GMT
Distribution: na
Organization: fermilab
X-Xxmessage-Id: <A7252BA494011099@jenson.fnal.gov>
X-Xxdate: Tue, 10 Nov 92 09:04:36 GMT
X-Useragent: Nuntius v1.1.1d9

One use is in electron tubess. The cathodes are either coated with the
these materials or they are formed into a matrix with other metals. The
primary function in these applications is to reduce the work function of
the surface of the cathode so that more electrons are emitted for a given
operating temperature
Chris Jensen , ccjensen@fnal.fnal.gov
From: monson@hobo.ECE.ORST.EDU (Ty Monson)
Newsgroups: sci.materials
Subject: Re: Schottky contacts on p-silicon ?
Date: 6 Nov 92 22:40:36 GMT
Article-I.D.: news.BxBGBw.522
Organization: ECE Dept.,OSU,Corvallis

In article <spe_pa.16.0@physik.uni-paderborn.de> spe_pa@physik.uni-paderborn.de (Peter Alteheld) writes:
 (stuff deleted)
>So, is there anybody out there who has experience in 
>preparing this kind of contacts ?
> 			
 I don't know the "best" way to prepare these contacts, but I got
 Schottky contacts on p-type Si by sputtering Titanium on the Si,
 followed by a layer of Aluminum.

 The Si must be clean, of course. After chemical cleaning, I introduced
 the specimen to the ion beam immediately prior to metal deposition
 in order to sputter away any remaining contamination. As I said, I
 don't know if this is the best method, but I did get schottky diodes,
 and I was able to do DLTS measurements with these contacts.
Newsgroups: sci.materials
From: gawne@stsci.edu
Subject: Re: Kryptonite bike locks
Organization: Space Telescope Science Institute
Distribution: na
Date: Thu, 5 Nov 1992 14:16:32 GMT

In article <1992Nov4.201029.27404@bcrka451.bnr.ca>, simpson@bnr.ca (Scott Simpson) writes:
> In article <1992Nov4.103151.12144@fs7.ece.cmu.edu> snyder@henry.ece.cmu.edu (John Snyder) writes:
>>In article <1992Nov2.202507.28755@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
>>>PAPAI@kcgl1.eng.ohio-state.edu (Jonathan Papai) writes:
>>>: JULIUS@BTVLABVM.VNET.IBM.COM (Julius C. Chang) writes:
>>>: >I will not describe it so don't bother asking me about it.
>>>:  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>>: 	I nominate this for AFU motto of the week.
>>>I agree - maybe even for the month.
>>>Bill
>>O.K., I'll show my ignorance.  What does AFU stand for?
>                                 ^^^^^^^^^^^^^^^^^^^^^^^^
>>John
> 
> Forget it.  We have a winner.  Maybe they could alternate weeks?
> 
> Scott "Call off the dogs, the search is over" Simpson
> 
> P.S.  Check the newsgroup name, John.  Or maybe rot-13 it...

For all you enlightened souls in Alt.Folklore.Urban, a number of us read
this post and its followups in Sci.Materials.  The question was NOT
unreasonable.  So, "check the cross posting list, Scott."  At least John
was humble enough to admit the possibility of ignorance.

-Bill Gawne,  Space Telescope Science Institute
Newsgroups: sci.materials
From: Tony.Prats@launchpad.unc.edu (Tony Prats)
Subject: Red Mud and Fly ash
Followup-To: prats@bigvax.alfred.edu
Summary: information wanted re: processing of red mud and fly ash
Keywords: Bauxite tailings, fly ash, re-use
Organization: University of North Carolina Extended Bulletin Board Service
Date: Thu, 12 Nov 1992 22:28:35 GMT

I am planning to begin my senior thesis, and one possible topic that
interests me is the disposal of bauxite tailings (red mud) and fly ash
through some combination of the two, perhaps making bricks or agglomerates
for concrete.  I know a little about them, but I was wondering if anyone
had specific knowledge about this, or could provide some good references on
red mud, fly ash, or combinations.  Thank you.

						Tony Prats

prats@bigvax.alfred.edu		Tony.Prats@lambada.oit.unc.edu


--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  laUNChpad.unc.edu or 152.2.22.80
From: vcm@ccwf.cc.utexas.edu (V. Chandramouli)
Newsgroups: sci.materials
Subject: Re: Heterojunction bandstructure calculations
Date: 8 Nov 92 18:12:58 GMT
Organization: The University of Texas at Austin, Austin TX
To: f29802m@kaira.hut.fi

In article <1992Nov5.081229.2190@nntp.hut.fi> you write:
>
>  Howdy,
>
>  Does anybody know where to get simulation programs to do bandstructure
>and carrier density calculations for hetrostructures, preferably for ones
>containing several stacked quantum wells ? We have one written here in HUT, 
>but it only handles one half-well, not a set of complete wells ( a super-
>lattice) or eg. two interacting wells.
>
>  Thanks,
>           Mikko Kiviranta
>

I am interested in your model -- can I have a copy of it ?

For stacked quantum wells, I am aware of several papers in the 
literature that describes how to calculate the band structure.
If you are interested in heterostructure device simulation you should
consult the software from Purdue University (Mark Lundstrom's group)
called PUPHS.  This program can (I think) calculate carrier
densities in a heterostructure.   If you need more information on 
the contact e-mail address and bibliography please send me an
e-mail (mouli@emx.cc.utexas.edu).

Chandramouli.                                 mouli@emx.cc.utexas.edu
---------------------------------------------------------------------
Microelectronics Research Center in the University of Texas at Austin
---------------------------------------------------------------------
From: jpr1@ns1.cc.lehigh.edu (James P. Reynolds)
Newsgroups: sci.materials
Subject: Get a clue.   (WAS: Re: Kryptonite bike locks)
Date: 5 Nov 92 22:19:27 GMT
Organization: Lehigh University

In article <1992Nov3.230907.4135@organpipe.uug.arizona.edu>, rperkins@astro.as.a
rizona.edu (rachel perkins) writes:

>               -just give me what for,
>       rachel perkins =  rperkins@astro.as.arizona.edu
>      "Chastity..the most unnatural of all the sexual perversions...."
>                                       -Aldous Huxley
>


Does anyone else find this as patently offensive as I do?


Jim





-- 
James P. Reynolds       (that's Jim to you and me.)      jpr1@lehigh.edu
   You don't insult my choices, I won't insult yours.    jreynolds@igc.org
From: cervi@oasys.dt.navy.mil (Mark Cervi)
Newsgroups: sci.materials
Subject: Thermal conductivity of EPDM synthetic rubber
Date: 5 Nov 92 16:52:10 GMT
Organization: NSWC, Carderock Div. Det., Annapolis Facility

Does anyone know the thermal conductivity for EPDM synthetic rubber?
I've checked in Perrys and the CRC handbook, but I can't find anything
listed.

To get my calculations going, I've estimated it at 0.15 BTU/hr-ft2-F/ft,
but this is only a guess.  If you know, please post, or better yet,
e-mail (I doubt that this is of general interest.)

Apologies if you've already seen this (I posted to sci.chem.eng and
sci.energy already, but forgot about sci.materials, which should have
been my first choice.)

Thanks, Mark
-- 
	Mark Cervi, CARDEROCKDIV, NSWC Code 2752, Annapolis, MD  21402
	  cervi@oasys.dt.navy.mil, (w) 410-267-2261, (h) 410-647-0990
Newsgroups: sci.materials