| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | over 8 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 8 years ago | |||
| warren | "I was wondering if, since the silica kind of redirects the light (a little like fiber optic), if you could illuminate it with a directional light d..." | Read more » | almost 10 years ago | |||
| mathew | "I found a scanner, the Canon 9000F and 9000F MKII, with an optical resolution of 9600dpi and an interpolated resolution of 19200dpi, or pixels 2.6μ..." | Read more » | almost 10 years ago | |||
| stevie | "Neat Mathew! nice work. " | Read more » | almost 10 years ago | |||
| eustatic | "Also, just want to repeat that corporate and government types are very sensitive to this kind of data. Even though I am tasked to work on water, I..." | Read more » | almost 10 years ago | |||
| eustatic | "cool. My understanding is that, at least for coal dust (=mostly crystalline silica), most particles of interest fall in the PM10 category. GCMoni..." | Read more » | almost 10 years ago | |||
| mathew | "Ok. Updated. the situation is better than I thought. A 4800dpi scanner could definitely give straight PM10 measurements, possibly with identifica..." | Read more » | almost 10 years ago | |||
| mathew | "Ok-- apparently my math is all wrong. I thought DPI was dots per square inch. this is completely wrong. it is dots that can be placed in a line o..." | Read more » | almost 10 years ago | |||
| mathew | "@eustatic in a bit, lets get something working first ;-) @warren A smartphone would definitely work for identifying silica! its just a matter of m..." | Read more » | almost 10 years ago | |||
| btbonval | "Not to derail the post, but am I the only one who thinks those pictures look like they were taken from the Hubble telescope? " | Read more » | almost 10 years ago | |||
| warren | "Nice! What kind of lens would it take to make a smartphone can work? I'm thinking about plastic or resin lenses... and portability, but probably ju..." | Read more » | almost 10 years ago | |||
| eustatic | "cool, want some coal dust to play with? " | Read more » | almost 10 years ago |