| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| mathew | "further followup on analysis of samples. " | Read more » | over 9 years ago | |||
| mathew | "read my follow-up on imaging the samples " | Read more » | over 9 years ago | |||
| mathew | "@DavidMack Good catch! My notebook measures test 2 at 38.78, right next to 39.78 for the next test! I edited the note. thanks! You're right abou..." | Read more » | over 9 years ago | |||
| mathew | "awesome! " | Read more » | over 9 years ago | |||
| mathew | "That candle protector is a great way to picture how this sensor works! I think the tiny grate on top of the sensor itself does something similar. ..." | Read more » | about 10 years ago | |||
| mathew | "I'm pretty worried about those particles too. I think we would need an electron microscope to measure them though-- that's a pretty big barrier to..." | Read more » | about 10 years ago | |||
| mathew | "Thanks! @amysoyka that's an interesting idea. I haven't ever studied mines specifically, just basic geology. You're right though-- the issues of ..." | Read more » | about 10 years ago | |||
| mathew | " Usually gravimetric tests are done on particles after they have been captured in the field. Given environmental vibrations, it sounds tough to pi..." | Read more » | over 10 years ago | |||
| mathew | "Ok- No rush. " | Read more » | over 10 years ago | |||
| mathew | "those would be real cool to see! i would like to do a time-based comparison. can you e-mail them to me? mathew at publiclab thanks! " | Read more » | over 10 years ago | |||
| mathew | "I'll connect with Hank on his Dylos-- we'll see what he's doing. there are a million ways to do this that have already been done-- so yeah, we sh..." | Read more » | over 10 years ago | |||
| mathew | "I've been operating on the assumption that the EPA/ISO standard = PM2.5. I guess this is an etymology question. which came first: PM2.5 or the EP..." | Read more » | over 10 years ago | |||
| mathew | "maintenance is an issue-- look at these dylos monitors in China building up particulates http://aqicn.org/faq/2013-10-21/dylos-air-particule-conter..." | Read more » | over 10 years ago | |||
| mathew | "@donblair-- the author doesn't seem to understand the terminology in use. The conclusions are based on a misunderstanding of what PM2.5 actually m..." | Read more » | over 10 years ago | |||
| mathew | "@donblair-- the author doesn't seem to understand the terminology in use. The conclusions are based on a misunderstanding of what PM2.5 actually m..." | Read more » | over 10 years ago | |||
| mathew | "Oh Ethernet! Cool that probably isn't too hard to talk to but a computer of some sort will be needed. Serial is great! We can probably get it to t..." | Read more » | over 10 years ago | |||
| mathew | "How does data come off? USB? Serial? There's got to be something " | Read more » | over 10 years ago | |||
| mathew | "yes, they are also optical, like the Dustduino and Speck, but they use lasers instead of focused LEDs. " | Read more » | over 10 years ago | |||
| mathew | "Also, I noticed your two Dusttrack monitors you're using had different air intakes (pic below). is the cyclone really important? would it improve ..." | Read more » | over 10 years ago | |||
| mathew | "Cool! Does the dusttrack or dylos have a sensor-out port? I'm thinking we could hook it up to another data logger and collect humidity data on t..." | Read more » | over 10 years ago | |||
| mathew | "From the literature on stickypads, concentrations of particles smaller than the resolution of the scanned image can be roughly estimated by albedo ..." | Read more » | over 10 years ago | |||
| mathew | "right-- and with an SLR the image capture would be much faster than waiting for a scanner. " | Read more » | over 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 » | over 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 » | over 10 years ago |