Re: [SI-LIST] : What's your favourite Screwy SI Concept?

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Sat Jan 15 2000 - 12:36:30 PST


Water flow is also examined mathematically with field theory.
Maxwell's ideas for electromagnetics were derived from
the field theory of fluid dynamics. Current is certainly a component
of both theories.

regards,

scott

Lee Ritchey wrote:

> The thing moving is an electromagnetic field. Analyzing the problem in terms of current flow is not useful in this case.
>
> Jian Zheng wrote:
>
> > Hi:
> >
> > In fact, the flow of electric current is very similar to the flow of water
> > current.
> >
> > | |
> > | |B______
> > |
> > |A__________
> >
> > When you have a bend, the current will take a short cut at the corner B. The
> > current at the corner A will be slowed down. For the electric current, the
> > slow down at corner A will create reflection from the corner. The short cut
> > at the corner B will make the electric path shorter than measured along the
> > center line. For standard PCB, the reflection from the corner is very small.
> > However, I understand that the electrical length is very important in clock
> > synchrinization. Accumulation of the shortening of electrical path at angles
> > may have effect to SI. Thanks!
> >
> > Best regards,
> >
> > ----------------------------------------------------------------------------
> > ------------
> > Jian-X. Zheng, Ph.D
> > Zeland Software, Inc., 39676 Mission Blvd., Fremont, CA 94539, U.S.A.
> > Tel: 510-797-8109, Fax: 510-797-8241, Web: http://www.zeland.com
> > ----------------------------------------------------------------------------
> > ------------
> >
> > > -----Original Message-----
> > > From: owner-si-list@silab.eng.sun.com
> > > [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Jeff Seeger
> > > Sent: Friday, January 14, 2000 10:05 AM
> > > To: si-list@silab.eng.sun.com
> > > Subject: Re: [SI-LIST] : What's your favourite Screwy SI Concept?
> > >
> > >
> > > Tom Dagostino wrote:
> > > >
> > > > Bending a wire keeps a uniform cross section. Putting a corner
> > > in a trace
> > > > adds extra C at the corner from a larger area.
> > > >
> > > And herein lies the arguement, I believe.
> > >
> > > Perhaps those who argue against "right angles" envision a
> > > geometry where the line has a squared corner both on the
> > > inside of the elbow and the outside.
> > >
> > > I would wager that those who claim no material effect are
> > > working with the usual CAD system/photoplotter geometry of
> > > a squared corner inside the elbow and a radiused one on the
> > > outside.
> > >
> > > An attempt at ascii art:
> > >
> > > "Right Angle" "Standard Practice"
> > >
> > > \ \ \ \
> > > \ \ \ \
> > > > > > )
> > > / / / /
> > > / / / /
> > >
> > > HTH,
> > > --
> > >
> > > Jeff Seeger Applied CAD Knowledge Inc
> > > Chief Technical Officer Tyngsboro, MA 01879
> > > jseeger "at" appliedcad "dot" com 978 649 9800
> > >
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--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com

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