Recent content by Rich76

Thank you all for wonderful responses. I'm going to try everything.

My brother has terminal rectal cancer, and he has a colostomy bag. He feels humiliated in quiet waiting rooms with other people when his bag starts making fart sounds. I'm trying to find a material to enclose his colostomy bag to dampen the sounds. There's a company that sells neoprene foam...

Thank you.

I forgot to mention that the battery case is plastic (HDPE).

Yes. The cells share the same aluminium current collector (coated in carbon). Attached on one side of the current collector is the negative carbon cloth, and attached on the other side is the positive carbon felt. Is that okay?

It's designed to be membrane free. The corrosive bromine at the surface of the positive carbon felt dissolves zinc dendrites forming from the negative electrode back into the electrolyte faster than they can build, given the appropriate charge current.

Sorry if the answer is obvious, but I was wondering if positive and negative electrodes (cells in series) can share the same current collector as depicted below? I want to create a 12V battery with cells inline in series without creating cells with individual current collectors. Note that the...

Thank you both :)

I'm looking at a cost breakdown of items, and one looks like this: Plastic Tank cost ($ L−1) 0.22 – 0.37 I think what it's saying is that a tank costs $0.22 to $0.37 per Liter of volume. Regardless, I don't understand it ($ L−1). I understand negative exponents, but I don't see how...

I'm looking at two different batteries for home energy storage. Both batteries have a coulombic efficiency in the upper nineties, say 96%. One battery has an energy efficiency of 90%, and the other has an energy efficiency of 60%. I believe both ratings represent loses of usable energy, but I...

I was reading a forum post on a gaming website, and someone posted something I found interesting. Some have argued that it goes against scientific facts, specifically with regard to Quantum Mechanics. I don't know who's right, but I'd love to hear your thought on this? Human Wonder: "Random"...

According to wikipedia, this is how to calculate flexural stress where "the loading span is 1/3 of the support span (rectangular cross section)": stress = force x length / (width x (depth x depth)) Stress ("outer fibers at midpoint"), (MPa) Force ("load at a given point on the load deflection...

That's great to hear. I feel like I'm on the right track then. I too want to use 100% of the outside air. I'm trying to make a very small mobile air cooler to cool just a few cubic feet of space. Originally, I was going to use Dura-Cool pads until I read negative reviews, and then I thought...

Thank you for the information. Where I live the air is dry and hot. I plan to test different pad thicknesses, and levels of water saturation to see which combination offers the greatest cooling effect.

:) Yeah. The tests they do with the YETI ice chest to demonstrate durability by throwing them off a cliff, I suppose would be a bad idea.