Recent content by dholbach

I don't understand why the positive electrode would need to be inside the tube (or bulb). At first, I thought this might be because of boundary conditions -- that maybe the electric field stops at the glass. But then I realized this was all nonsense, since E fields extend through insulators...

Very cool!

I wasn't trying to build a cheap scope. I know how to make one from an old TV and I've seen instructions like the ones you linked to before. I was interested in building a cheap cathode ray tube because I'm a physics geek and I thought it would be a neat experiment.

Awesome. Thanks for the link! In their version of the experiment, they used a two filament bulb, burned out one of the filaments, and then sent electrons "boiled off" of the other filament across the remaining gap. I'm wondering if the same effect could be achieved using a single filament...

Light bulbs and cathode ray tubes are structurally similar in some respects. For example, both contain a filament -- in the light bulb, the filament heats up to produce light, while in a cathode ray tube, the filament emits electrons, which are then steered into a target (in a CRT TV, the...

ModestyKing -- Thanks for your reply! In my code, k_tot is calculated by summing the degrees of every node. So, even if you were right, it wouldn't matter. At any rate, the reason that k_tot is 2x the number of edges is because the edges are counted twice -- once at each node. Suppose we have...

I've been working on implementing the Barabasi-Albert model in C++. Barabasi-Albert networks are supposed to be scale-free -- that is, their degree distribution is supposed to be power-law distributed. In order to test whether my program was working correctly, I plotted the degree distribution...

Hey folks! I'm brand new here. My interests in physics are rather broad, but lately I've been doing work in complex systems theory & statistical physics.