On Dec 12, 2009, at 9:34 AM, Laurence Libin wrote: > The plural of 'ancedote' isn't 'data.' Haven't there been any > controlled experiments to answer this question definitively? Seems > like a useful undergraduate project in materials science and > engineering. > > Laurence Excellent question. To the best of my knowledge, the answer is no. Which is why I posted. It seemed like as close to a controlled experiment as I have observed: I believe the only significant variable was temperature (granted, I didn't take precise before and after measurements of all parameters). It would be a great undergraduate or graduate project. While anecdotal evidence is certainly suspect, when you are observant and see the same effect from what seems to be the same set of causes, you can start to form a theory or at least an expectation. I have also observed tuning effects after an overnight humidity rise of 15% or more, on many occasions (it rained, after a period of stable dry RH). The patterns repeat. So I see the RH rise and have an expectation, and the expectation is fulfilled. This is in an environment I know quite a bit about, and while something else could have happened as well, ti seems pretty doubtful. Regards, Fred Sturm University of New Mexico fssturm at unm.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20091212/5bed0bb4/attachment.htm>
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