Recent content by Sravoff

Hey Fredrik, thanks for the hint that worked great! I can see the 2|uv| identity now, but that didn't get me closer to a generalized form. I played with a couple of other forms that didn't wind up looking too promising. Hey platetheduke, is here an justification for where those come from in the...

I've been reading "The Qualitative Theory of Ordinary Differential Equations, An Introduction" and am now stuck on an inequality I am supposed to be able to prove. I am pretty sure the inequality comes from linear algebra, I remember seeing something about it in my intro class but I let a friend...

MIT opened up a number of their courses to everyone for free awhile ago, so I would start there. Each course has a different amount of stuff--some have video lectures, some just homework sets--but I've used a few for physics and they were great. Many other universities have opened up course work...

Thanks for the analysis Jim. I think that non-linearity is my problem. So how does the frequency get determined for the LC-tank circuits? Most of the frequencies are in a form that looks like f = 1 / (2pi*sqrt(LC)), where LC are often functions of the capacitors and inductors in the...

Hello, I am trying to get a better understanding of how oscillator circuits (clapp, hartley, colpitts etc) work, so I have been trying to solve the differential equation for a very simple one--the one most the way down the page here...

Thanks verty, unfortunately it isn't. The one I had was Fourier series graphs, but they weren't filled in like that. They were also brighter in tone, more warm I guess. I know I don't have a ton to go on here, but thank you so much for the suggestion!

Thanks deadbeef. I was hoping to get some work done on the project before replying, but life keeps happening.

After searching the net for a few days and not finding anything that would tell me what to expect from a very crude thermopile, I crunched a few numbers and wound up with an absurd number of amperes coming from my calculations--I doubt my copper/nickel thermopile will produce 320 amperes. I...

Yeah, the iron is beginning to look like a problem, I'll have to fix that somehow. Going from zero to a working thermocouple is proving to be a path fraught with many dead ends--helluvah learning experience though, thanks!

Thanks Nascent, that is what I needed to know. The teg power link I posted claims to have created a few thermo piles that charge a 12 volt battery off a wood stove. They use n and p semiconductors, where I'll be using nickel/iron junctions so mine won't at all be as efficient, but I think...

I don't have much of a budget, no means to gather the best, possibly necessary, materials, soi am sticking to what I have. I would love to use a fresnel lens, but I don't have access to one, so parabolic solar oven it is. Because the seebeck effect only produces tens of microvolts per degree...

If you want an in-depth exlanation, "Everything and More: the compact history of infinity" explains what the exact problem is, and how it was finally solved. It's a book and requires about two semesters of calculus to grasp all of the concepts in the book, though you can get through it with...

I am working on a solar oven powered thermopile and am trying to figure out how big to make the individual thermocouples. The easiest materials for me to get a hold of will be iron and nickel, Which will give me a seebeck coefficient difference of about 34, so I will need quite a few of these...

I was thinking the pressure with the water could create a sort of controlled thermal run away, which is not the case. So I will be just using one piece of metal.

Thanks CWatters, I thought there was something strange going on with that reasoning and now I see exactly what is. Mfb, I was going to use two reservoirs of water, one sealed for the pressure, and another for the evaporation, which would have to be refilled. Thanks all!