Might be a good candidate for Ken Gilleo's "Mysteries of Science" series...?
http://www.circuitmart.com/web/mysteries_science.shtml
onward thru the fog,
Jack
.
On Wed, 27 Oct 2010 09:26:56 -0400, Joyce Koo <[log in to unmask]> wrote:
>They could use U oxide glasses from england made in late 1800.
>--------------------------
>Sent using BlackBerry
>
>
>----- Original Message -----
>From: Douglas Pauls [mailto:[log in to unmask]]
>Sent: Wednesday, October 27, 2010 08:53 AM
>To: [log in to unmask] <[log in to unmask]>
>Subject: Re: [TN] Disappearing Fluorescence
>
>Something actually factual in Wikipedia. Who'd a thunk it.
>
>Maybe the pilots are drinking ruthenium enhanced coffee.....
>
>Doug Pauls
>
>
>
>Bev Christian <[log in to unmask]>
>10/27/2010 07:37 AM
>
>To
>TechNet E-Mail Forum <[log in to unmask]>,
"[log in to unmask]"
><[log in to unmask]>
>cc
>
>Subject
>RE: [TN] Disappearing Fluorescence
>
>
>
>
>
>
>Doug,
>It was a looong time ago, but I did take a fourth year course in
>photochemistry. Fluorescence can be "quenched" in a variety of ways. For
>instance quinine fluorescence can be quenched by chloride. See the
>Wikipedia link.
>
>http://en.wikipedia.org/wiki/Quenching_(fluorescence)
>
>Bev
>RIM
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
>Sent: Wednesday, October 27, 2010 8:30 AM
>To: [log in to unmask]
>Subject: [TN] Disappearing Fluorescence
>
>Good morning all,
>
>I posted a picture to the IPC Technet gallery.
>
>http://ipc-technet.groupsite.com/gallery/16251
>
>This is taken from a failure analysis effort I am working on. Its amazing
>
>what happens to electronics when you spill coffee into them.
>
>One of the assemblies I have been looking at has a very odd visual effect
>that I have never seen before. The conformal coating has a fluorescing
>dye to it that glows blue under black light, which is common. Notice how
>the fluoresence has disappeared from the areas over one set of traces. I
>have seen fluorescence disappear before, but it usually heat releated and
>over a large area, nothing highly localized like this. My first thought
>was that there had been a jumper wire installed in these locations, but
>that is not the case.
>
>I showed this to my good friend Phil Kinner at Humiseal, who is no
>stranger to the wierd and wacky world of conformal coating oddities, and
>he has not seen anything like this either.
>
>Anyone else seen this?
>
>Doug Pauls
>
>Maybe this could be one of Inge's Friday quiz items............
>
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