Subject: Suture Lines - Fractal Description possible?
From: Rine Vos
Date: 27 Oct 1996 19:15:33 GMT
Hi!
I am trying to refine the detailed determination of 53 specimen of the
ammonite Hildoceras Sp., which I found in the Causses, south of France.
The usual measures fail to give sufficient evidence of the subgroups
indicated using the 'normal' measures like Whorl Width, Whorl Height,
Maximum Diameter, Ombilicus etc.
Therefore I want to try to use the basic parameter values of a fractal
description of the suture lines.
I can catch the suture lines with image processing techniques. But then?
(As an example: for continuous functions one can use Fourier transforms
and extract the main frequencies to have a sufficient description of the
shape; however for suture lines they are generally/often discontinuous.
Therefore I feel I have to resort to fractals.
Can somebody help me out?
Rinke Vos
Subject: Re: Caltech Seismology Lab Helps Pinpoint Location of Meteorite Fall
From: Wil Milan
Date: 27 Oct 1996 13:02:04 -0700
Ron Baalke wrote:
>
> You're forgetting that this meteorite entered into the Earth's atmosphere
> twice. The first time through, it was seen by people in Arizona and
> New Mexico. It went through Earth's atmosphere back out into space, and
> looped back around and entered Earth's atmosphere a second time and
> for good.
I wasn't aware of that. But I'm still confused: According to CalTech's
seismology data, it was traveling east-northeast when in fell to ground.
But
if it had just come over Arizona and New Mexico, how could it be heading
east when it fell over California? And I thought all the reports were of
it traveling west to east, putting it over Arizona and New Mexico
*after*
California, not before. Me no comprende.
Is there a source for detailed info on this meteor?
Wil Milan
Subject: Re: Water down a sink.. which way does it run?
From: "H.W. Stockman"
Date: Sun, 27 Oct 1996 14:38:11 -0700
olivier fabre wrote:
>
> Hello from a layman,
> At work the other day, we got into a discussion relating on the phenomenon
> whereby water runs in clockwise in the north hemisphere and anti-clockwise
> in the southern hemisphere. (The phenomenon has a name which escapes me
> right now).
The too-often heard claim is that
because of Coriolis "force" (a psuedo-force
caused by the earth's rotation and varying
distance from the pole of rotation with
lattitude), water spirals in one direction
in the northern hemisphere, and another in
the southern. But several tests (and simple
calculations of the force magnitude) show
that the Coriolis effect is totally swamped
by slight variations in the plumbing.
> However we were stumped when we tried to figure out how water runs at the
> equator.
In a cheap hotel, down all over your feet.
Subject: Re: Caltech Seismology Lab Helps Pinpoint Location of Meteorite Fall
From: laz@leland.Stanford.EDU (Laz Marhenke)
Date: 27 Oct 1996 13:22:16 -0800
In article <3273BFA7.1F01@airdigital.com>,
Wil Milan wrote:
>Ron Baalke wrote:
>>
>> You're forgetting that this meteorite entered into the Earth's atmosphere
>> twice. The first time through, it was seen by people in Arizona and
>> New Mexico. It went through Earth's atmosphere back out into space, and
>> looped back around and entered Earth's atmosphere a second time and
>> for good.
>
>I wasn't aware of that. But I'm still confused: According to CalTech's
>seismology data, it was traveling east-northeast when in fell to ground.
>But if it had just come over Arizona and New Mexico, how could it be
>heading east when it fell over California? And I thought all the reports
>were of it traveling west to east, putting it over Arizona and New Mexico
>*after* California, not before. Me no comprende.
>
It first entered the atmosphere over Arizona and New Mexico. Then it
left the atmosphere (so becoming invisible) and orbited _all_the_way_
_around_the_Earth_, always heading west to east, over the Atlantic,
probably Africa, the Indian Ocean, the Pacific, finally coming back down
when it had made it 95% of the way around the world, which is over
California. (Actually, to be more accurate, it had made it 100% of the
way around, but the Earth had rotated some in the meantime, putting
California rather than Arizona-New Mexico under its perigee.)
Laz
Subject: CIVIL ENGINEERING RESOURCES ---> News !!!
From: oscarhur@ran.es (Oscar)
Date: Sun, 27 Oct 1996 20:59:01 GMT
You can find now new areas & links in my List of CIVIL ENGINEERING RESOURCES:
-----------------------------------------------------------------------------------
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-----------------------------------------------------------------------------------
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Associations
Official Centers
Research Centers
Transportation
Highways
Railways
Ports
Structures
Hydraulic
Construction and Companies
Construction Materials
Soils, Geology, ...
Environment
Software (CAD,Aplications for engineering, ...)
Publications
... and more areas in next months like Surveying, ...
And You can visit too my Civil Engineering Site (Principal Page) at:
-----------------------------------------------------------------------------------
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-----------------------------------------------------------------------------------
This page is a meeting point of Civil Engineers, Constructors, ... around the world.
You can find here many information related to civil engineering:
1) A great list of civil engineering resources classificated by areas:
2) The first (or one of the first) virtual publications of Civil Engineers made in Spain.
(in english version too!). A place where you can contribute with your opinions, ideas,
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3) My own pages dedicated to Civil Engineering studies in Madrid (Spain) at Polytechnic
University. "Escuela Tecnica Superior de Ingenieros de Caminos, Canales y Puertos".
History, Departments conected to Internet, Courses, ... (Only in spanish by now).
I hope you like them.
------------------------------------------------------------
Greetings from Spain
------------------------------------------------------------
Oscar Hurtado Albert
Email: oscarhur@ran.es
Madrid (Spain)
------------------------------------------------------------
My Civil Engineering Site:
>>> http://www.geocities.com/CapeCanaveral/4378/cis.htm
------------------------------------------------------------