fracsand
fracsand


Author Comment Last activity Moderation
jaydenbecnel "How can ground water be dangerous to peoples well water? " | Read more » about 2 years ago
michaelhenry "Nice post... Here is my site pls visit https://pvacorner.com/youtube-pva-accounts " | Read more » over 3 years ago
warren "Collecting notes on different sensors here! https://publiclab.org/q/15751 " | Read more » about 5 years ago
warren "Hi, Gretchen - do you have some examples of when and where this technique has been successfully used by folks? Thanks! " | Read more » almost 6 years ago
Tinashe "You don't state what happens with the 40 images taken. Are they stacked together for analysis or they are analysed individually. " | Read more » almost 6 years ago
tayreed "Have to read through this rather than glancing at it soon! Thanks for writing! " | Read more » about 6 years ago
marlokeno "Hi, @bkleist- One thought regarding the moisture obscured lens-if the camera is in an enclosure, a small fan to circulate air should help with cond..." | Read more » about 6 years ago
mathew "You can see more about the shape descriptors for each particle here: https://publiclab.org/notes/mathew/09-19-2015/using-imagej-to-process-passive-..." | Read more » about 6 years ago
mathew "The image analysis creates: perimeter of each particle area of each particle circularity of each particle Circularity is the ratio between the..." | Read more » about 6 years ago
warren "Hi! Just re-reading, is it right that the image analysis produces (as it's complete output): perimeter of each particle area of each particle ..." | Read more » about 6 years ago
warren "Hi! A few of us tested out a <$100 trail cam which worked really well -- it has a lot of the features you might need: https://publiclab.org/not..." | Read more » over 6 years ago
gretchengehrke "Hi @bkleist, Interesting stuff! What is your electricity situation and need for being inconspicuous like where you have the camera? I wonder if a ..." | Read more » over 6 years ago
stevie "Hi @bkleist Thanks for posting on this! I know of a few other people who are interested in using cameras to watch for blasting events. So I'm reall..." | Read more » over 6 years ago
cfastie "Hi Ben, I haven't used the motion detection feature of the Mobius but it should work well if you can place the camera where a blast will cause eno..." | Read more » over 6 years ago
mathew "Followup on automating this process https://publiclab.org/notes/SimonPyle/05-13-2016/automating-imagej-for-particle-image-analysis " | Read more » almost 7 years ago
marlokeno "Thanks for this excellent report, Stevie " | Read more » almost 7 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 » about 7 years ago
gretchengehrke "Powerful speech. " | Read more » about 7 years ago
eustatic "awesome effort. " | Read more » about 7 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 » over 7 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 » over 7 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 » over 7 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 » over 7 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 » over 7 years ago