Author | Comment | Last activity | Moderation | ||
---|---|---|---|---|---|
warren | "OK, added "equalize area" and scripting to the sets page: https://spectralworkbench.org/sets/show/1461 It still doesn't save, but makes that part ..." | Read more » | over 9 years ago | |||
warren | "Diesel, gear oil, and N. Dakota crude: " | Read more » | over 9 years ago | |||
warren | "Just a quick followup on area normalization: We really need smoothing that we can save too. " | Read more » | over 9 years ago | |||
warren | "I tried to find gel caps but CVS didn't have them; I was going to order online but saw your note about the fluorescence... should I still order them? " | Read more » | over 9 years ago | |||
warren | "Do you (or jack) mean getting the laser to be in the same place each time with relation to the slit? If the laser is fixed in place by the cardboar..." | Read more » | over 9 years ago | |||
warren | "Actually, kind of amazing -- for the Creative webcam ones, not enough laser was actually reflected into the spectrometer to get the 405nm peak... c..." | Read more » | over 9 years ago | |||
warren | "Oh, edit: the Creative had a wider than usual slit -- maybe 1.25mm or so. So maybe the clipping in the blue channel wouldn't be as bad with a littl..." | Read more » | over 9 years ago | |||
warren | "I also tried using a reflective metallic surface behind the cuvette to make the fluorescence brighter: It was hard to see, naked eye or by camer..." | Read more » | over 9 years ago | |||
warren | "Hi, Mat - I've noticed that olive oil fluorescence is much dimmer than crude oil fluorescence, and I shipped you some crude samples this morning. T..." | Read more » | over 9 years ago | |||
warren | "You're right - it's a pretty high baseline. Something like 10%, no? I believe this is noise, but some may be related to infrared reflectivity insid..." | Read more » | over 9 years ago | |||
warren | "Hi, Livio - I was so fascinated with your post -- where exactly did you collect a sample from, and was it soil? Water? " | Read more » | over 9 years ago | |||
warren | "Another draft of the paper research note: I also made a Post-It notepad of these on Zazzle.com: http://www.zazzle.com/public_lab_paper_research..." | Read more » | over 9 years ago | |||
warren | "UV laser through a fish oil pill tested here: http://publiclab.org/notes/warren/08-14-2014/sample-container-search#c10038 " | Read more » | over 9 years ago | |||
warren | "Just mention it because the pill is filled with liquid, and reminded me of your straws. " | Read more » | over 9 years ago | |||
warren | "Amy, have you tried shining a laser through those? I had the odd experience today of finding a fish oil pill, and look what happens when you shine ..." | Read more » | over 9 years ago | |||
warren | "I'm doing a test today putting one bottle of 3 identically prepared Onta #1 samples of crude in mineral oil in the freezer, to see if temperature a..." | Read more » | over 9 years ago | |||
warren | "Very true, re: alignment -- is there any way to do a tiny tiny amount like a nanodrop while keeping the (possibly toxic) sample material sealed som..." | Read more » | over 9 years ago | |||
warren | "Well, ideally, much smaller would be great -- i think the ones you've found are mostly 15ml?, but the reality may be that nail polish bottles just ..." | Read more » | over 9 years ago | |||
warren | "Maybe -- the paper describes different kinds of filtering, one from when the laser enters the liquid, one from when the fluorescence exits the liqu..." | Read more » | over 9 years ago | |||
warren | "OK, links to some citations. I'm visiting an MIT building now so it's hard to tell which are open access; i'll try to check on this later: Jiji et..." | Read more » | over 9 years ago | |||
warren | "The orig bottles were basically square, but not very precise -- sort of that wavy crude surface from molded glass. But I have a sense that there's ..." | Read more » | over 9 years ago | |||
warren | "Interesting -- specific PAHs are (as we've seen in other literature) out of the 400-1000nm range of our device: monoaromatic compounds (benzene, t..." | Read more » | over 9 years ago | |||
warren | "p56 mentions "polycyclic aromatic hydrocarbons (PAHs), pesticides, environmental hormones" as contaminants that can be detected with fluorescence s..." | Read more » | over 9 years ago | |||
warren | "So the Carstea paper is great for one particular reason - we've suspected that organic material could fluoresce and potentially interfere with our ..." | Read more » | over 9 years ago |