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I’ve had 4 in a 20 gallon for over a year none have died

Thanks!

Wald is a very advanced textbook!! Carroll is much more accessible and considered an absolute classic. Introductory books are the one by Scharz or Hartle. For differential geometry, the 2 books by Loring Tu are real gems 💎💎💎

Pretty epic, mines held with zip ties! I learned recently that the uv in them can cook the zip tie to brittleness over time haha! I’ll have to swap them out occasionally…

I have several, and swap them out every few months to clean them. So simple, and it takes only a few minutes.

Please more book review videos! ❤❤❤

Professor Grinfeld has a new version of the book available on his website. Unfortunately it's only in pdf...

I do like the book. I find the notation a little annoying in terms of the symbolism. Overall, I do recommend it.

Me: learning double, triple, curve an plane integrals, Green's, Gauss'es and Stokes's theorems for a math 3 exam, and YT is like: Hey, I dunno why, but you may be interested in this! Me after watching it: Bro, wtf but it is so true 😂

This has inspired me to make videos similar to this, where i just give me own thoughts about random stuff i find interesting. Ive been putting it off for far too long lol

I recently started doing these aswell, it's so fun reading these old books

What I don’t understand is why it’s not as simple as unrolling the cylinder to get the diagonal of the curve since it’s constant slope, and using that as the internal circular diameter?

As a sheet metal fabricator I can tell you exactly why his initial calculations were wrong or at least flawed to begin with. We use something called a K-factor when calculating the bends of metal, now steel has a convenient K-factor of 0.5 meaning, he should've added half of the width of the spiral to a before making the calculation. So in reality a = 7.75 To explain what K-factor is simply, it's the theoretical line you draw down the edge of a piece of metal, that after bending, has gotten no shorter or longer due to deformation. IE on one side of this line the metal is being squeezed together and on the other it is being stretched. For anything with tooling the final K-factor will in reality come down to a table of K-factors that they arrived at experimentally long ago. To maybe be tweaked if the part can't hit tolerances after being cut. But for anything that'll be slip rolled, it isn't the internal or external diameter you use to calculate the length, it's width of the piece, multiplied by the materials K-factor, plus the internal diameter. That is your actual radius.

2:22 this is false. If it was a real engineer, they wouldve just said 6

My jd 950 had same problems but the alternator wire was broken off. Put new end on it and it started right up. Good video thanks 👍

Seeing this next to a machinist's video titled "This is why we hate engineers" is so funny

I thought you where going to put the end of the air line INTO the POWER HeADS Venturi and that will suck it out too!!! Try it do a vid. Say Pauli sent ya!

Thank you for making this video and posting in the comments how you fixed it. This is happening with ours right now!! Ugh!

Do you think this will fit over the lip of my standard 75 gallon tank. it says it will do 3/4 but reviews on their protein skimmers from Aqua ready say they don't fit. It wouldn't be my main filtration but was hoping my uv (green machine) would fit in the area where the water comes out Refugium area along with my heater. Tx

I understand they wanted to get unwrapped plate shape in order to weld on a cylinder. Today, one can find it quickly using cad tools.

a bit confused here. isn't e sub i dot e sup j = del sub i sup j only for orthonormal basis? but we're dealing with curvilinear coordinates. this should not in general be true. please explain.

Happy New Year

I am trying to learn. Any books you would recommend? I can only loosely grasp this on more of a general scale but get lost in the actual jargon at the moment

O ring lube usually sorts it out.

I just got mine and have never used one before. The instructions aren’t great on how to install it lol

Cool thing is that the mathematician doesnt need to do a whole other round of guessing if there was a slight variation in the initial conditions or parameters. The answer will always work if a mathematician can generalize it.

Happy New Year

I can remember when I was in company during my masters and the task was to design and tune a controller fast in a day before the superior was flying. I had a plant model and the controller architecture was proposed. There were like 2 controller parameters to tune. I did trial and error tuning and after a few minutes I got the parameters. My superior came and asked me how I got to that parameters. He wasnt happy about my approach so he started to do the proper design method using pole placements and in the end after hour he ended up with parameters that happened to be the same as mine.

nice

I read the title as "a very shitty tensor" and was like why we hating?? (I'm yet to take tensor calculus this semester)

Lol the filter media goes up top in the filter not where the surface skimming is

That "HELLO" felt so human-like. You know what I mean

Yooooo Frank Morgan was my Prof at Williams College. One of the GOATS!!!!

This is the first screen cap I've seen of someone working on a chrome book.

VSV is not NOPOX tho. NOPOX is made from BioEthanol and smells entirely different

You can spend 200 hours thinking about how to do something, or you could just give it a try. Unless lives are at stake, then take the 200 hours. Obviously.

Thats the shortest book ive ever seen on Riemannian Geometry! Id recommend Lee's smooth manifolds book (2nd edition) to give you the tools needed to really dive into this course!

I love that engineers will happily try things and iterate to find a functional solution; however, the perfectionist in me also appreciates how the curious among us will search for the answer that lies beyond a functional solution.

its nice to see the random stuff i saw in cal 3 having real world use.

My mentor at my first engineering job always scolded me about trying to be "too precise". He always told me: "it's not pharmacy". Years later I say this to every intern I have

The speed? I see it as the slope. This is not that groudbreaking and I can see many engineers reaching a similar conclusion.

"someone has to do the shit we make up" ~ an architect, probably

The helix is not for structural support, but to prevent damage that could be caused by vortex shedding on a smooth cylinder.

your channel is a gem, keep posting!

a mathematician and an engineer are walk into a bar. They both notice a pretty girl across the room they both want to talk to her so the engineer proposes a bet: he who gets to the girl first gets to talk. they both sprint towards her and are kicked out of the bar the end. ...i forgot the original joke

Whoa whoa whoaaa! How am I gonna convert my eel from brackish water to freshwater? If bacteria need to always exist, I need to convert it in a flash, I don't think the eel could adapt that fast.

The first page talks about Curvature and shows the equation we learn in vector calculus. Very interesting to see practical applications! Thank you for sharing.

Nice though 🙂

I wonder, who calculated structural strength calculation 😊

well, engineer obtained this from experiment. Mathematician had a formula. Formula can be applied to another size of stake. experiment must be done again. however, experiment may be done with paper and scisors, in small scale 😊