| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| mathew | "I just bought the air pump components and a graduated cylinder to try and compare @davidmack's cheapo air meter... can't wait. I'm going to try us..." | Read more » | over 9 years ago | |||
| straylight | "Good points and I understand how you feel, coming at his from a chemistry teachers viewpoint myself. I guess it depends on what experiments and dem..." | Read more » | almost 10 years ago | |||
| srpratt | "I'm new to the cellphone-becomes-a-photospec phenomenon, as I was told about this by a colleague. As an AP Chem teacher, I'm looking for hacks to ..." | Read more » | almost 10 years ago | |||
| nshapiro | "I think so. Those tubes require one pump on the Draeger Tube proprietary pump. So if one were to rent their proprietary pump for a single day and a..." | Read more » | about 10 years ago | |||
| sara | "Exciting stuff! Do you think this method could work for other pump based tubes like these http://www.buydraegertubes.com/hydrogensulfide02b.aspx " | Read more » | about 10 years ago | |||
| ichinarayan | "ok thanks so much " | Read more » | about 10 years ago | |||
| straylight | "In spectral workbench, when you are looking at a spectra, there is an option to export and save the data in a variety of formats, including xml and..." | Read more » | about 10 years ago | |||
| ichinarayan | "wow beyond belief. i thought it was complicated listing program. and how do you exported the spectra image into csv form? thanks a lot " | Read more » | about 10 years ago | |||
| nshapiro | "That sounds like a great idea. The flow meter remains the most expensive component so reducing this cost is clutch. This sounds like something that..." | Read more » | about 10 years ago | |||
| DavidMack | "The commercial air flow meters are easy to use and come with NIST traceable certificates but you can make your own air flow meter for lab use that ..." | Read more » | about 10 years ago | |||
| straylight | "Thanks for the question ichinarayan, I exported the spectra in csv form into microsoft excel. From there I selected the wavelengths I wanted to st..." | Read more » | about 10 years ago | |||
| ichinarayan | "what software do you use for your analisis program used to generated graph? " | Read more » | about 10 years ago | |||
| stoft | "Ok, so the plots are absorption; which makes more sense. However, the Y axis is labeled "Intensity". It would be more clear to either plot relative..." | Read more » | over 10 years ago | |||
| ygzstc | "Dave - Thanks a lot for the insights...As you said, when I add oil sample, intensity decreases and since the plots above is the difference between ..." | Read more » | over 10 years ago | |||
| jeffh | "Very nice work. I checked the listing for the lamp, and if you are using the original bulb, it is a "warm white" with color temperature of 2700 deg..." | Read more » | over 10 years ago | |||
| stoft | "Nice experiment. As I recall, white LEDs have a significant 'bump' at about 430nm, a dip at 470nm and a broad peak about 600nm so I assume the 470 ..." | Read more » | over 10 years ago | |||
| liz | "Wow this is fantastic!!! I can't wait to try this method~! " | Read more » | over 10 years ago | |||
| ygzstc | "Jeff, I am sure it can be done. However, coding is not my strong suit :( I may help on theory and algorithm development though... Cfastie, you are..." | Read more » | over 10 years ago | |||
| cfastie | "This is excellent research. Do you think if I bought some "100% extra virgin olive oil" and sent you a sample, you could tell me if it was really 1..." | Read more » | over 10 years ago | |||
| warren | "Wow, this is spectacular -- thanks! I'm wondering if there's a way we could write a macro for Spectral Workbench to do this kind of analysis in rea..." | Read more » | over 10 years ago | |||
| warren | "This is fantastic to see carried out so methodically. " | Read more » | over 11 years ago | |||
| warren | "Hi, Chris - i copied this down from YouTube but the version I got was a bit pixellated. Any way you could post the original so we can reduce copyin..." | Read more » | over 11 years ago | |||
| mathew | "Nice! i find my beans won't twine around poles that are smooth, they'll only twine around the textured bark of sticks or rope, preferably manila or..." | Read more » | over 11 years ago |