Recent content by AHolico

Let \mathbf{S} = \mbox{$\frac {1}{2}$}(\sigma_1 + \sigma_2) be the total spin of a system of two spin-(1/2) particles. a) Show that \mathbf{P} \equiv (\mathbf{S} \cdot \mathbf{r})^2 / {r^2} is a projection operator b) Show that tensor operator S_1_2 = 2(3P - \mathbf{S}^2) satisfies S_1_2...

I think this would be a great idea, not just for the human body, maybe just for simpler molecules, or just to explore the surface of bulk materials, see phase transformations on real time. Maybe we will see something completely different of what we imagine right now. My "perception" of the...

First, I think you have to be a little more carefull of when to use effects of relativity in an experiment. Even though they are happening all the time and everywhere, their effects will be noticed more in experiments of very, very high speed. As an example, I ask a friend to go on his car...

It is an interesting experiment. I really doesn't know the outcome of it. I believe some gas lights works on this principle. You have a tube filled with gas, and two electrodes at each end with a potential difference. Some electrons will escape the negative electrode, and will be...

All I know is that if there are charged species in the gas, then those charged species will acellerate in the pressence of an electric field. When those charged particles have a collision with other particles (if it have enough energy), they can transfer energy and exite the gas particle. So...

What can be equal in those ideal cases is that the change in potential energy = - change in kinetic energy. This comes from the fact that you are dealing with conservatory forces and therefore the total energy is conserved (total energy = kinetic energy+potential energy). Therefore, since the...

Experiments to describe the band structure of bulk (solid) materials? I just want to know the name of some of the most used techniques to describe or obtain information of how the band structure of the material is. Not by theorethical calculations, just experiments. For example, let say I...

(Force)-(The Same Force)=0 To me, that is all what the Euler-Lagrange equation is all about. Sorry, I know this doesn't help, just wanted to check if that statement is kind of true.

band pass Well, if it is the ideal RC filters case, then is just the combination of the low pass and the high pass. I can't remember the formula. I think you can also make CL band pass filters. Which case are you interested in?

Let me explain my situation. Recently I was admitted to a material science laboratory at my university (University of Puerto Rico). We are going to try to grow carbon nanotubes by the Chemical Vapor Deposition (CVD) process. My first step is to get information on the technique (wich is...

I'm planing on learning Statistical Mechanics by myself. I would like to hear recomendations on what you think are the best Statistical Mechanics books. My interest right now would be books that are on a undergraduate level, with detailed explanation, examples and problems, but you could also...