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August 2004

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Subject:
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ingemar Hernefjord (KC/EMW)
Date:
Tue, 31 Aug 2004 09:06:59 +0200
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text/plain (71 lines)
Carl,
we made a similar arrangement a couple of years ago. Used a ceramic chip capacitor with tinned end caps. However, some underlying silver was exposed to ambient, so, when the cap was in the humidity chamber, silver migration developed, and very fast. We took out some caps and studied them under microscope. They were connected to a Curve Tracer, some 0.5 - 1 VDC and a meg series resistor. Still with droplets of water on the surface. We could register silver 'trees' growing across the entire ceramic surface in less than 10 seconds! I think the speed is depending on a series of factors, like temperature, ion source, voltage difference. It was a shocking experience!

Ingemar Hernefjord
Ericsson Microwave Systems


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Carl VanWormer
Sent: den 30 augusti 2004 19:41
To: [log in to unmask]
Subject: Re: [TN] Historical Document (Dendrites) time question


Was this growth "real time".  If not, how long did the process take?


Carl Van Wormer
Cipher Systems
1815 NW 169th Place, Suite 5010
Beaverton, OR  97006
Phone (503)-617-7447    Fax (503)-617-6550



-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Sunday, August 29, 2004 12:18 AM
To: [log in to unmask]
Subject: Re: [TN] Historical Document (Dendrites)


Steve

As far as I'm aware, this clip is in the public domain. I know that Charles
Jennings distributed many 16 mm copies of it. If this is so, then you don't
need my permission. If it is considered copyright, then you should obtain
permission from Sandia (I don't imagine this would be a problem).

Of course, the tiny image in my download is hardly suitable for
reproduction. I could provide it in a form reproducible on a TV or computer
screen as an SVCD (PAL 480 x 576 pixels 25 fps or NTSC 480 x 480 29.97 fps)
or even a DVD (PAL 720 x 576 25 fps or NTSC 720 x 480 29.97 fps). I'd be
willing to do this on a non-profit basis, but my costs (media, conversion
and authoring time on specialised equipment, packing and postage) would have
to be covered. (As I'm "retired", living on a pension, I no longer have a
company to sponsor me.) I hope this is not contravening IPC rules on
spamming on the TN.

Brian

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