Recent content by AxisCat

Appreciate the reply and i will check out the links you supplied. Thanks for your help and insight.

Hi All- I am trying to calculate an overall u-value for a wall with steel c shaped framing. Here is my model, i simplified it to (2) parallel flow paths. I can't be sure if the correction factor I used for the metal stud is even correct: I am a tradesman and having been performing heating...

I am overwhelmed with the replies to my question. Thank you to everyone that contributed their insight. I am going to take some time and reread through all of this; I am probably just making it harder than it really is.

Like the title says, I am really struggling to have an intuitive understanding of what mass is. I know how silly that statement is as I consider myself to be a fairly smart guy. It started as I was working through some fluid dynamic equations for water flow through pipes and such. Being a...

So I lucked up on the MSDS documents for this test kit. The phosphorus extractant: This looks very similar to the chemicals used with the Murphy-Riley method which is a well documented method to test for phosphorus: Maybe I can use this new information to better understand exactly how...

Thanks for the equation, I knew it was going to be a lil off but it is nice to know the proper way to calculate it. What I am attempting to do is measure the amount of Phosphorus from a sample of soil. This is where things get a bit sketchy. I purchased a soil test kit for NPK. From...

Hi All, I am not sure if I am doing my math correctly. I am sure my method is jacked up but here is what I did: I mixed .5g of KH2PHO4 powder with 100 ml distilled water. From my poor understanding of chemistry I thought I would end up with a .5% solution or 5000 ppm. I then tried to...

Thanks for the reply. I am up and running light through my monochromator now. I am in the process of learning about photodiodes and transimpedance amplifiers. Do you have any experience with this?

Again I want to thank you two for the help. I got lucky and the light from my projector nailed the entrance to my monochromator without any shimming in elevation of either piece. I ended up replacing the stock lens with a 24mm SLR camera lens and it did a very nice job focusing the light down...

I appreciate the help and it seems I was making this way too complicated. I was trying to apply my experience as an amateur photographer to this. This projector looks like a classic example of the thin lens equation in the links provided by DaveE. I didn't mention the fact that this projector...

I am looking for help getting started with focusing light into my monochromator. This is all just hobby level stuff with limited budget for high end lab gear. I have a 35mm slide projector I am going to re-task as a light source. It has a 200 watt tungsten bulb that is passed through a...

I appreciate the reply. The "mapping function" is the part I am stuck on. Someone suggested Fourier transforms because the curves looked like filters and the math can be reversed. That looked really complicated so I haven't researched it any further. Another person's thought was using a...

Hi All, This is a project I started a couple of years ago then got stuck or bored and stopped working on it. I am thinking about picking back up where I left off. I am using a AMS AS7262 color sensor with the following overlapping channels: 450, 500, 550, 570, 600 and 650 nm, each with 40nm...

Thank you Chester. I am experiencing a bit of information overload at the moment. I may have misunderstood your question about the diameter and length. In regards to the heat exchanger that is information I won't be able to obtain. It is actually coiled up in a donut shape with spray foam...

Since I am just trying to understand flow through the heat exchanger as the bladder tank empties I am ignoring losses due to the pipe. But to get velocity you have to have an area so let's use a 1" diameter pipe 12" long.