Recent content by OneMoreName

I will have a look through other posts. Not much activity here.

OK, if it's analogous to the the light cone in relativity I have two origins here at 1,-1. Everything that lies in the cones is affected in spacetime. This explains the 5 upper regions, but why is region 6 considered to be affected (its integral is not zero). I would have thought the integral...

Hi there, This is a problem concerning hyperbolic type partial differential equations. Currently I am studying the book of S. J. Farlow "Partial differential equations for scientists and engineers". The attached pages show my problems. Fig. 18.4 from case two (which starts in the lower part...

That's right, but the problem is you cannot separate n or κ out. For example you get something like n^{2}(n^{2}-\muc^{2}\epsilon)=(\frac{μc^{2}σ}{2ω})^{2} and I don't see how to get to n2. Oh, OK, just have to solve the quadratic equation after substitution and one gets to the results, duh...

Hi, Got a problem with the following derivation: Coming from the Helmholtz equation one gets: \textbf{n}^2=\muc^{2}(\epsilon+i\frac{\sigma}{\omega}) which is of course something like: \textbf{n}=n+i\kappa My question is, how do you obtain the following relations...

Solved.

Hi there, I arrived at the solution for a electric potential problem for a semi-infinite cylinder (there was a potential distribution given for the boundary conditions but that's not important here). http://i210.photobucket.com/albums/bb283/DidgeFrank/Cylinder_pot.jpg The solution is...

Though evolution would not have been possible without radiation the mutations which are caused are mostly disadvantageous. Because of this there is a whole machinery in the cells which is responsible to repair the damaged DNA. Am I wrong or does the effects in comics (superpowers) stem from the...

Oh yes, thanks! I was fooling around with the densities because it is mentioned in the text but this leads to nowhere.

Hi all, I am preparing for a job interview in some nuclear facility and have to refresh my knowledge about nuclear stuff. So I started reading the book of Lewis "Fundamentals of reactor physics". I got stuck at page 35, formula (2.24). Does anyone have a clue how to arrive at this equation...