| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| SimonPyle | "@marlokeno That's a great tip for eyeballing and catching dust. On that note, as I clean up a prototype of some code to automate this process, I'm..." | Read more » | over 8 years ago | |||
| marlokeno | "@mathew, @SimonPyle, @AmberWise, @Damarquis, @Pagyebo Wonderful work- I can't imagine counting particles while sizing them, etc. So cheers to the ..." | Read more » | over 8 years ago | |||
| mathew | "Also see @Damarquis's note on using MaxEntropy https://publiclab.org/notes/Damarquis/10-20-2015/using-imagej-to-analyze-threshold-and-saving-result..." | Read more » | over 8 years ago | |||
| mathew | "I'm writing up an introduction to particles in the air right now (rough draft), and one of the questions I wanted to answer was about naked eye obs..." | Read more » | almost 9 years ago | |||
| gretchengehrke | "Conductivity readings would indicate the presence of ions, but since there is so much calcium, and also substantial amounts of magnesium etc, it wo..." | Read more » | almost 9 years ago | |||
| eustatic | "would a conductivity reading help indicate the presence of metals? I've only ever done bottle sampling with solvents for metals testing. " | Read more » | almost 9 years ago | |||
| eustatic | "awesome effort. " | Read more » | almost 9 years ago | |||
| eustatic | "What EPA Regions are the previous 4 examples of citizen enforcement? EPA's attention is a limited resource, and EPA's attention in region 6 is hea..." | Read more » | almost 9 years ago | |||
| mathew | "I'm working on creating a spreadsheet out of these equations. @Marlokeno it looks like I'm going to use Sutherland's gas law along with average te..." | Read more » | almost 9 years ago | |||
| mathew | "@Damarquis has notes on using ImageJ in windows and on thresholding: http://publiclab.org/notes/Damarquis/10-20-2015/using-imagej-to-analyze-thresh..." | Read more » | about 9 years ago | |||
| marlokeno | "One possibility in order to get a clearer image is to try using the "threshold" filter in photoshop, or photoshop elements, GIMP, etc. It's helped ..." | Read more » | about 9 years ago | |||
| marlokeno | "It is possible the wikipedia article on Reynolds numbers might help- https://en.wikipedia.org/wiki/Reynolds_number At any rate, the article does g..." | Read more » | about 9 years ago | |||
| wsg | "Hi Gretchen, Really interesting project which you should be able to generate some very interesting metals data with the WheeStat. I have been work..." | Read more » | about 9 years ago | |||
| marlokeno | "There is an article in "Aeolian Research", Dec. 2014, entitled "The size distribution of desert dust aerosols and its impact on the Earth system." ..." | Read more » | about 9 years ago | |||
| jeffalk | "You probably know about the EPA site with monitoring data around the Chicago coke facilities. The EPA data could be used to compare to whatever dat..." | Read more » | about 9 years ago | |||
| liz | "This is incredible work!!!! You guys are awesome! " | Read more » | about 9 years ago | |||
| mathew | "further followup on analysis of samples. " | Read more » | about 9 years ago | |||
| mathew | "read my follow-up on imaging the samples " | Read more » | about 9 years ago | |||
| bareczek | "interesting " | Read more » | about 9 years ago | |||
| warren | "We've gotten the Shinyei connected up to the Phant instance at http://data.sparkfun.com, with an open source driver, over USB: http://publiclab.org..." | Read more » | over 9 years ago | |||
| situlla | "Hi mathew, thanks for the directions, I have a question, I get output data in this form; PM10 count,PM2.5 count,PM10 conc,PM2.5 conc 1258.74,-829...." | Read more » | over 9 years ago | |||
| marlokeno | "Markdowm Sorry about that. By the way, the subtitle of the article is The hardest DIY project ever. http://www.popsci.com/diy/article/2011-07/you-b..." | Read more » | almost 10 years ago | |||
| mathew | "@marlokeno do you have the link to the DIY SEM? I don't see it in your note. I would love to re-use an old CRT electron gun, but I agree with you..." | Read more » | almost 10 years ago | |||
| marlokeno | "What if, in constructing some algorithm to count silica particles, you used a GIMP or photoeditor threshhold editor on the image? The silica would ..." | Read more » | almost 10 years ago |