[time-nuts] Improving the stability of crystal oscillators
SAIDJACK at aol.com
SAIDJACK at aol.com
Mon Oct 15 06:31:03 UTC 2007
In a message dated 10/14/2007 23:07:04 Pacific Daylight Time,
namichie at gmail.com writes:
>Thermal transients propagate into the ground on a different law,
>Gauss' Error Function.
>If the ground is cleared of trees, one hundred years later at a depth
>of 100 metres or
>so there will be a record of the change in average soil temperature.
>The Cave was Saltpetre Cave in Carter Caves Park.
>Just thought you might like to know.....
>Neville Michie
Hi Neville,
your post made me remember stuff from my University days!
Gauss' Error Function is also used to calculate diffusion depth of
semiconductors.
HP/Agilent makes a semiconductor tester to measure this depth.
One interesting fact I remember from this: the form of the diffusion profile
depends on the speed (time) of the actual diffusion process into the bulk
material.
I bet there is a nice analog to temperature transients progressing through
soil.
I love it when micro and macro effects show mathematical similarities.
bye,
Said
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