HDTenEightyP/NetNews huggingface dataset:
From: eanv20@castle.ed.ac.uk (John Woods)
Newsgroups: sci.fractals
Subject: Re: Fractal sound?
Date: 5 Jan 93 14:58:29 GMT
Organization: Edinburgh University

denham@hmsp04.wg3.waii.com (Scott Denham X7117) writes:

>In article <93002.002334U41602@uicvm.uic.edu> U41602@uicvm.uic.edu (Rich Chong) writes:
>>I heard that there is a fractal tone that sounds like a tone of
>>a forever increasing pitch, but in reality doesn't.
>>Is there a name to this?

>I believe it's known as Shepherd's tone. 

I wouldn't have thought this qualified as a fractal --- more a
psychological effect.  There was a very interesting article on this in
Scientific American sometime in the last year, showing how cultural
differences in tone interpretation could be due to differences in
intonation during speech.  Check it out ...

				... John Woods
-- 
 /******* cut here ******* John Woods ******* cut here ********
 * Philosophy: Forsan et haec olim meminisse iuvabit (Virgil) *
 * Disclaimer: Every statement in this file is possibly !true *
 ******** cut here ******* John Woods ******* cut here *******/
From: boshoff@sunvax.sun.ac.za (Hendrik Boshoff)
Newsgroups: sci.fractals
Subject: Re: fractal videos
Date: 7 Jan 93 16:51:49 GMT
Organization: University of Stellenbosch

In article <Jan06.181327.60627@yuma.ACNS.ColoState.EDU>, 
dfuquay@CS.ColoState.EDU (d'ann fuquay) writes:

> A friend of mine is looking for a good video about fractals.  She
> wants to use it in a presentation about fractals to a local group of
> engineers.  Can anybody out there recommend one or more?  Of course,
> any pointers to how to acquire whatever you recommend will be
> appreciated.
> 
> dfuquay@mesa2.mesa.colorado

There is now a whole range of possible videos. I have only seen one
(which I own, and can recommend highly) namely "Fractals: an
animated discussion --- Interviews with Benoit Mandelbrot and
Edward Lorenz," by H-O Peitgen, H Jurgens and D Saupe.
They are of course the Bremen people who wrote "The Beauty
of Fractals" and "The Science of Fractal Images," and more
recently a two volume introduction "Fractals for the class room."

This video is "accessible to high school students on up."
It contains animations of fractals, fractal music, explanations
of some fractal concepts, a very elegant experiment with magnets,
and of course the interviews with the grand people of fractals
and "chaos."

I would say it is very suitable for an introduction to engineers,
but I have seen non-technical people enjoy it immensely.
It was last priced at $50 at a mail order firm in California:
Media Magic, PO Box 507, Nicasio, CA 94946, 415-662-2426,
but it is also availible directly from the publishers;
WH Freeman if I remember correctly.

Media Magic (with whom I have no connection) have a nice
catalog on "Computers in Science and Art", including all
the classic books on fractals and chaos, T shirts, post cards
and calenders with fractal designs, videos, fractal music CDs
and software.

Some of the other videos listed which you might consider, are
titled "The beauty and complexity of the Mandelbrot set" 
(John Hubbard), "The fractal universe -- educational" and
"Dynamical Systems" (Robert L Devaney).

Hope you find what you're looking for.

Hendrik
-- 
                         Hendrik F.V. Boshoff                              
    Dept E&E Ingenieurswese             Dept E&E Engineering               
    Universiteit van Stellenbosch       University of Stellenbosch         
    SUID-AFRIKA                         SOUTH AFRICA                       
                      email boshoff@firga.sun.ac.za                        
Xref: sparky sci.fractals:552 alt.binaries.pictures.fractals:822
From: BMKBB@CUNYVM.BITNET (Bhanu M. Kuchibhotla)
Newsgroups: sci.fractals,alt.binaries.pictures.fractals
Subject: HELP:NEED FTP SITES FOR FRACTALS and Possibly source code too
Date: 6 Jan 93 22:57:30 GMT
Organization: City University of New York/ University Computer Center

Hi folks,

   As the subject says it all, could any noble soul e-mail me the ftp
site list for fractals executables or pictures and possibly source code
too?  I would really appreciate your help.  This is kinda urgent as I
want to look at some so that I could get an idea on fractal programming
which I plan as a project for fall computer graphics course.

Thanks in advance

Bhanu MK
Newsgroups: sci.fractals
From: ctdonath@lemming.syr.EDU (Carl T. Donath)
Subject: Re: Fractal landscapes for MS-DOS?
In-reply-to: jute@sday.pulp.nullnet.fi's message of Tue, 05 Jan 93 14:53:15 EST
Organization: Syracuse University
Date: Fri, 8 Jan 93 09:58:24 EST

There's a good one available - name partially escapes me at the moment - 
something like "VistaPro"
--
______________/ ctdonath@rodan.acs.syr.edu \______________________________
Most people agree that the government is largely sluggish and ineffective.
Then why do most people demand that it do everything for them?
--------------------------------------------------------------------------
From: boshoff@sunvax.sun.ac.za (Hendrik Boshoff)
Newsgroups: sci.fractals
Subject: Re: fractal photos
Date: 11 Jan 93 16:46:56 +0200
Organization: University of Stellenbosch

In article <93007.215927LMACC@CUNYVM.BITNET>, Len Alshan <LMACC@CUNYVM.BITNET> writes:
> Would appreciate any information regarding photographing fractal images.
> Am working on a PS/2 Model 80 with 8514A video and have good photo
> equipment. Not interested in professional grade photos or slides.  This is
> purely a for fun project.
> Thanks

I'm no professional either, but I obtained useful color slides just
using the built in light meter of my slr camera.

It seems to me the most important thing is to eliminate the
video monitor's flicker. That happens at about the power frequency
or half that (60 or 30 Hz). So make sure the shutter remains open
for long enough.

Darken the room (preferably completely) to eliminate reflection
from the screen.

Definitely use a tripod.

Try a lens of length 100-110 mm, more or less the same as for
full face photography, to keep the distortion down. (That is if
you want a "flat" picture. I suppose a fish-eye can give interesting
effects, but you can attain them simply by using another projection
when plotting.) Move the camera to fill the viewer with the picture.

Play with the intensity and contrast settings of the monitor to get
the background as black as you like it and the colors as saturated
(after your eyes have become adapted to low light levels).

If the resultant shutter speeds are acceptable, use one or two stops
down from you lens's largest f/stop (to play down possible optical
imperfections).

Usually the colors are arbitrary, so a slight change in rendering
from monitor to film shouldn't bother you.

I had Ektachrome 200 handy (you could use a finer grain (slower film),
but you can't do better than the pixels). I set my 35-200 mm zoom
on 100mm at f/3.5. Various images with different colors measured
at between 1/15 s and 1/2 s. I bracketed by over and underexposing
two stops, but in the end the light meter's suggestion was the best
each time. The result was acceptable, but they of course look just
what they are: photographs of a video display.

Hendrik

-- 
                         Hendrik F.V. Boshoff                              
    Dept E&E Ingenieurswese             Dept E&E Engineering               
    Universiteit van Stellenbosch       University of Stellenbosch         
    SUID-AFRIKA                         SOUTH AFRICA                       
                      email boshoff@firga.sun.ac.za
Newsgroups: sci.fractals
Subject: fractal photos
From: Len Alshan <LMACC@CUNYVM.BITNET>
Date: Thursday, 7 Jan 1993 21:59:27 EST
Organization: City University of New York/ University Computer Center

Would appreciate any information regarding photographing fractal images.
Am working on a PS/2 Model 80 with 8514A video and have good photo
equipment. Not interested in professional grade photos or slides.  This is
purely a for fun project.
Thanks
From: denham@hmsp04.wg3.waii.com (Scott Denham X7117)
Newsgroups: sci.fractals
Subject: Re: Fractal sound?
Date: 6 Jan 93 22:58:53 GMT
Organization: Western Geo. - Div of Western Atlas Intn'l Inc., Houston, TX

In article <29895@castle.ed.ac.uk> eanv20@castle.ed.ac.uk (John Woods) writes:
>
>>I believe it's known as Shepherd's tone. 
>
>I wouldn't have thought this qualified as a fractal --- more a
>psychological effect.

The reference I have to Shepherd's tones was a talk given by IBM's Richard
Voss at SHARE 79 in Atlanta. He didn't actually desribe it as a fractal
but used it to demonstrate the concepts of self-similarity. You _can_, if
you listen carefully, pick out the point where a rising tone drops out
and is replaced by one several octaves lower. Interesting effect, though.
From: dtang@dhusc.harvard.edu (Diane Tang)
Newsgroups: sci.fractals
Subject: Billiard Balls and Lyapunov Exponents
Date: 6 Jan 93 17:37:53 GMT
Article-I.D.: das.1993Jan6.173753.17833
Distribution: usa
Organization: Harvard University

I'm working on a project involving billard balls in a convex space.
The basic program just computes the trajectory of a ball in a circle,
ellipse, or stadium, given an initial velocity and initial position.

I want to add something that will calculate the Lyapunov exponents of
the system when the ball is in an ellipse or stadium (the exponent
should be zero for a circle).

Any suggestions on the best way to go about doing this?

Thanks!

please respond via e-mail: dtang@husc.harvard.edu

-- Diane Tang
From: shirriff@sprite.berkeley.edu (Ken Shirriff)
Newsgroups: sci.fractals
Subject: Re: Fractint 17.2: Intere
Date: 4 Jan 1993 06:29:26 GMT
Organization: University of California, Berkeley
NNTP-Posting-Host: hijack.berkeley.edu

In article <1993Jan4.003945.25062@netcom.com> pdh@netcom.com (Phil Howard ) writes:
>What *IS* the official name of the program?  If I tell someone that they
>can get a cool mandelbrot program that is fast, do I tell them to go find
>"fractint" or "frain"?

One solution is to look in the sci.fractals FAQ file, which lists the sites
to find software, tells where it is located, and includes the name the
program is archived under (although the name is not always up to date).

Like most FAQs, a copy of this FAQ is archived at various places such as pit-
manager.mit.edu [18.72.1.58]: /pub/usenet/news.answers/fractal-faq and
ftp.uu.net [137.39.1.9 or 192.48.96.9]: /usenet/news.answers/fractal-faq.Z .

Ken SHirriff				shirriff@sprite.Berkeley.EDU
From: boshoff@sunvax.sun.ac.za (Hendrik Boshoff)
Newsgroups: sci.fractals
Subject: Re: Image storing and fractals
Date: 11 Jan 93 17:05:43 +0200
Organization: University of Stellenbosch

In article <tdexte16.726519340@ursa>, tdexte16@ursa.calvin.edu 
[B(Terrence Dexter) writes:
> 
> 		  A friend told me about a research project that had resulted in
> the ability to survey an image in several layers of depth using fractals.
> I think the image in question was an iguana or some sort of creature
> of the sort and the image could be "blown up" (so to speak) on any 
> area.  The image was stored by using fractals.
> 		  My question is:  Does anyone know more information about this,
> especially who did it and where?  A reference would be greatly appreciated
> too.
> 		  Thanks. 

This sounds like a filtered description of one of Iterated Systems Inc's
demonstration images. They have a whole range of products by now, and
a whole range of demo images. The reptile is one on which the zoom-in
trick works nicely. Someone commented on this in another thread: you
are of course conjuring up information if you zoom in further than the
original definition. The additional data is manufactured through
interpolation --- fractal interpolation in this case. If the original
picture was highly self-similar, this procedure yields a remarkably
convincing blow-up. Definitely better on the eye than growing square 
pixels, but no use if you want to read the number plate on that spy
photograph of yours...

The people doing the work are headed by Michael Barnsley,
previously of Georgia Tech. They patented their algorithm,
but a book on the techniques has just appeared (see the post
on the new fractal image compression book).

For info on their pricey products, contact Iterated Systems at
5550A Peachtree Parkway, Suite 545, Norcross, GA 30092. 
(404) 840-0728. (No connection.)

Hendrik
-- 

                         Hendrik F.V. Boshoff                              
    Dept E&E Ingenieurswese             Dept E&E Engineering               
    Universiteit van Stellenbosch       University of Stellenbosch         
    SUID-AFRIKA                         SOUTH AFRICA                       
                      email boshoff@firga.sun.ac.za
From: jute@sday.pulp.nullnet.fi (Jussi Kantola)
Newsgroups: sci.fractals
Subject: Fractal landscapes for MS-DOS?
Summary: Wanted : a fractal landscape software for MS-DOS
Keywords: Fractal, landscape, mountains
Date: Tue, 05 Jan 93 14:53:15 EST
Distribution: world
Organization: Splattersday


Hi all,
is there a pd/sw software for ms-dos that creates fractal landscapes?
I don't mean the 3d-transformations that Fractint does, but instead
the type of landscapes created for example by an Amiga-program called
SceneryMaker.

---
jute@sday.pulp.nullnet.fi (Jussi Kantola) from Paltamo, Finland
"Hey, you're a real cool boy you" -- Z.B. -- DNA
Newsgroups: sci.fractals
From: twegner@mwunix.mitre.org (Timothy Wegner)
Subject: Re: Fractint 17.2: Intere
Organization: The MITRE Corporation
Date: Tue, 5 Jan 1993 18:27:01 GMT

Re the name of Fractint. When I upload the files to SIMTEL I use the
IBM PC name limitation. I attempt to include the name "FRAINT" in the file
name and still have the full version number. If the full version number is
longer, it eats into the name. Finally, I use the ".ZIP" extension. Thus
for version 17.2 the file name is FRAIN172.ZIP. When version 18 comes out
(no it is not ready yet!!) the name will be FRAINT18.ZIP. 

Of course this is the name for SIMTEL and it's mirrors. Sometimes other
sites change the name. I upload FRACTINT as a ZIP and not a self-extracting
archive at the request of Keith Peterson, although in my experience UNIX
unzippers can handle self-extracting zip files. Finally, the source file
has a similar naming convention, based on the name FRASRC. Thus the current
source file name is FRASR172.ZIP.

This is probably more than you wanted to know about this exciting topic! <g!> 
--
Tim Wegner     Fractint co-author
Internet: twegner@mwunix.mitre.org  Compuserve: 71320.675@compuserve.com
Newsgroups: sci.fractals
From: stgprao@st.unocal.COM (Richard Ottolini)
Subject: Re: fractal videos
Organization: Unocal Corporation
Date: Wed, 6 Jan 1993 21:48:48 GMT

In article <Jan06.181327.60627@yuma.ACNS.ColoState.EDU> dfuquay@CS.ColoState.EDU (d'ann fuquay) writes:
>A friend of mine is looking for a good video about fractals.  She
>wants to use it in a presentation about fractals to a local group of
>engineers.  Can anybody out there recommend one or more?  Of course,
>any pointers to how to acquire whatever you recommend will be
>appreciated.
>
I've seen two on racks in nature stores.
There is a another video acompanying Peitigen's "Fractals for the Classroom" course.
I have not viewed any of these videos.
From: jute@sday.pulp.nullnet.fi (Jussi Kantola)
Newsgroups: sci.fractals
Subject: Re: Fractal landscapes for MS-DOS?
Date: Sun, 10 Jan 93 13:27:33 PST
Distribution: world
Organization: Splattersday

taudas@ais.org (Tony Audas) writes:

> it is possible to use fractint and pov-ray (or other raytracer) to create
> high-res fractal landscapes

Yes, but then again they always look like they've been made with
Fractint and POV-Ray ;-).  I'd like to have a program generating
these landscapes that look like... well, whatever.  Good.
(Don't mean that a ray traced landscape looks bad, no!)

---
 Jussi Kantola from Paltamo, Finland
 email: jute@sday.pulp.nullnet.fi
From: dtang@virtual5.harvard.edu (Diane Tang)
Newsgroups: sci.fractals
Subject: Billiard Balls and Lyapunov exponents
Date: 8 Jan 93 16:11:22 GMT
Article-I.D.: das.1993Jan8.161122.28062
Distribution: na
Organization: Aiken Computation Lab, Harvard University

Hi -- I realized that I wasn't very clear in my first posting, so I'm
going to try again.

I'm working on a project involving billiard balls in a convex space,
i.e., an ellipse, stadium, circle, etc.  Currently, my program just
calculates the trajectory (given an initial velocity and position).
When the ball collides with a wall, the angle of incidence = angle of 
reflection.  There's no gravity, not acceleration in fact, and no
spin.  I do realize that this problem is pretty much deterministic.

However, even though it may be deterministic, I think that the
lyapunov exponents for the ellipse and stadium are positive (and 0 for
the circle), and I want to calculate them.

My current implementation is to take two points with slightly
different starting points, iterate them through the system, and
calculate the "x" and "y" exponents. i.e., 
l_x = 1/n sum( log_2 d_(i+1)_x - d_i_x )
                    --------------------
			d_i_x
where d_i_x = separation between the 2 pts at the ith iteration.

The problem with this implementation is that the direction of the
largest change is probably not in the x or y direction.

Alternatively, I could just calculate the largest exponent (just do
the total change), but I would really like to be able to get two
exponents.


Any ideas, suggestions, references, etc.?

Thanks a lot in advance!

-- Diane
dtang@husc.harvard.edu
Newsgroups: sci.fractals
From: dfuquay@CS.ColoState.EDU (d'ann fuquay)
Subject: fractal videos
Date: Wed, 06 Jan 1993 18:13:27 GMT
Organization: Colorado State University, Computer Science Department

A friend of mine is looking for a good video about fractals.  She
wants to use it in a presentation about fractals to a local group of
engineers.  Can anybody out there recommend one or more?  Of course,
any pointers to how to acquire whatever you recommend will be
appreciated.

dfuquay@mesa2.mesa.colorado
Newsgroups: sci.materials
From: gjmelden@phoenix.Princeton.EDU (Gregory J. Melden)
Subject: Re: Cleaning Calcium chips
Originator: news@nimaster
Organization: Princeton University
Date: Sat, 9 Jan 1993 19:12:08 GMT

In article <C0K42H.C75@max.physics.sunysb.edu> danube@max.physics.sunysb.edu writes:
>    I have some chips of Calcium that are badly oxidized.  I am wondering
>if there is a simple way to clean them.  I put them in a plastic bottle
>with N2 gas and sealed it for storage.  I noticed that if I shake the 
>bottle a lot, the oxide rubs off a bit.  I suppose I could put glass chips
>in the bottle and shake for a day.  Then I could take the Ca chips out in
>a glove box.
>    Any better Ideas?  Also, how can I store things like Ca, Na, K, and Rb
>without oil?  Is Carbon-tetrachloride better?  I need to put the chips in
>a high vacuum system and I don't want the oil around.  I assume things like
>C-tet evaporate more easily.
>							Danube


Under no circumstance should you allow an alkali metal to contact any
halogenated solvent.  T. L. Davis (The Chemistry of Powder and
Explosives, p. 402) describes the exciting reaction of sodium with
chlorform (CHCl_3); it is bound to inspire confidence if repeated in
your lab.  Even with alkali earths, these solvents should not be 
assumed to be chemically inert.  You might consider rinsing the 
oil off using a light hydrocarbon, such as hexane or cyclohexane 
(--after checking with someone knowledgable (not me!)).
From: ben@anu.edu.au (Ben Jar)
Newsgroups: sci.materials
Subject: Amorphous PET films
Date: 12 Jan 1993 23:09:22 GMT
Organization: Australian National University
Distribution: world
Reply-To: ben@anu.edu.au
NNTP-Posting-Host: 150.203.45.19
Keywords: PET

I would like to buy some amorphous PET films. A paper by D.R. Salem in Polymers 33(15) indicates that Rhone Poulenc and Goodyear supply this type of film. However, I do not know the address and FAX number to contact them. Does anyone out there have information about them or any company who sells this type of films? I'll greatly appreciate if you can send the information to me.

Ben Jar				|Tel: (06) 249 5908
Engineering Program		|Fax: (06) 249 0506
Australian National University	|e-mail: ben@faceng.anu.edu.au
GPO Box 4, Canberra, ACT 2601
Australia

Newsgroups: sci.materials
From: Chris Jensen <ccjensen@fnal.fnal.gov>
Subject: Re: Mat'ls meas. war stories
X-Xxmessage-Id: <A7773D1796011099@jenson.fnal.gov>
X-Xxdate: Mon, 11 Jan 93 15:04:55 GMT
Organization: fermilab
X-Useragent: Nuntius v1.1.1d9
Distribution: na
Date: Mon, 11 Jan 1993 20:57:53 GMT

From: Markus Jansons, markus@hpscit.sc.hp.com
Date: Fri, 8 Jan 1993 19:29:49 GMT
In article <64400002@hpscit.sc.hp.com> Markus Jansons,
markus@hpscit.sc.hp.com writes:
>
>
>Does any one have any interesting or new  applications experience
>with maeterials measurments using "electrical" methods.
>
>For example, maeauring capacitance and then calculating dielectric
>constant?  What did you use for fixtures or transducers? If you
>have or know of anyone doing or would like to do such measurements
>please  advise me.
>
>It could be very beneficial for both of us.....
>
>markus jansons               markusj@hpuamsa.neth.hp.com
>                                 1-408-553-2727  voicemail.

HP has a "transducer" and software that hook up to a HP8510 Network
Analyzer. This is for doing dielectric measurements with a
contact probe. Note that this requires a substantial, i.e. probably not
sputtered, amount of material. Also, the HP85071A software uses a NIST
based alogrithm for doing complex permittivity and permeability
measurements for samples in a coaxial air line. Lowest frequency is
in the 200 - 500 MHz region. The frequency region from 10 MHz to 100 MHz
seems to be the hardest to characterize since one can not ignore the
finite
extent of the sample and yet the phase change through the sample is
not significant relative to instrumentation errors, at least in my
experience.
Comments?

Chris Jensen
ccjensen@fnal.fnal.gov
Newsgroups: sci.materials
From: ghuntres@nyx.cs.du.edu (Gary  huntress)
Subject: Resistance of Carbon Fiber Tow
Summary: measured value too high
Keywords: carbon fiber resistance 
Organization: University of Denver, Dept. of Math & Comp. Sci.
Date: Fri, 8 Jan 93 13:33:06 GMT


Hi,

I'm working with a Hercules carbon fiber AS-4W that is s
supposed to have a resistance of 1.7 E-3 Ohms/cm (for a 12K tow).
I've used various lengths of fiber and multiple tows and I always seem to
get values much greater than I should, between 50 and 100 times
greater.  Does anyone else work in this area?  There doesn't seem to
be much interest in the electrical properties of conductive 
composites.

Thanks,

Gary Huntress
huntress@npt.nusc.navy.mil

Newsgroups: sci.materials
From: A10035@email.mot.com (Scott Lindsey)
Subject: Re: insulative fluids for thermal chamber
Organization: Motorola Corp. Man. Res. Ctr.
Distribution: usa
Date: Fri, 8 Jan 1993 10:20:10 GMT

In article <1993Jan8.002019.12042@magnus.acs.ohio-state.edu>, JHUANG@kcgl1.eng.ohio-state.edu (Jianzhong Huang) writes:
> 
>  I need some information about circulation fluids used in thermal chambers.
> Please reply to jhuang@kcgl1.eng.ohio-state.edu if you can help.
> 
>  The circulation fluids will be used in testing setup to check computer
> chips at temperatures around -100 C to -50 C. The fluid will used in
> the thermal chamber to maintain a constant temperature, and it should be
> insulating but with a high thermal conductivity. I heard about some organic
> based fluids, but need more information.
> 
>  Thanks in advance.
> 

Buy Fluorinert from 3M. It's very expensive but it's great stuff.
From: icornejo@slate.mines.colorado.edu (CORNEJO IVAN ARTURO )
Newsgroups: sci.materials
Subject: test
Date: 11 Jan 93 20:21:10 GMT
Distribution: usa
Organization: Colorado School of Mines

This a test. Please ignore