# Search results

1. ### 3space graphs on Mathematica 8

Well if you want to change the domain over which the plot is made, you just need to change the limits So this will show a cube that is 6x6x6 centered at (0,0,0) ContourPlot3D[f(x,y,z)==0,{x,-3,3},{y,-3,3},{z,-3,3}] This will show a larger region that is a 8x8x8 cube centered at...
2. ### How to show integral identity involving gaussian over x

I solved it (after some friends pointed out some simple mistakes I was making). For the record, here is how I did it. I will use spherical coordinates with the z-axis aligned with \vec{y} \int d\vec{x} \frac{e^{-x^2}}{\left| \vec{x} - \vec{y}\right|} = \int_0^{2 \pi} d\theta...
3. ### 3space graphs on Mathematica 8

Let me know if you have trouble, but they worked for me. In general, I find Mathematica's greatest strength for a beginner is the documentation. The documentation is mostly just a bunch of examples. Check it out. I didn't know about ContourPlot3D until I checked the documentation. The way I...
4. ### Plasma & the elemental table

So I believe that it will not be as simple as finding a table with elements and temperatures but it is possible that you could make sure a table with some assumptions. First off, do you know what a plasma is? In short a gas becomes a plasma when electron(s) are removed from the nucleus. The...
5. ### Boltzmann collision term

If you are still interested in this problem maybe I could help. I have spent the last few weeks working with the boltzmann and fokker-planck collision operators. I take from your question that you are solving the collisional boltzmann equation and are having a hard time numerically solving the...
6. ### 3space graphs on Mathematica 8

That is a good question. I had never actually used to visualize 3D surfaces until now. Nice idea. Here are some example bits of script: ContourPlot3D[6 x + 2 y + 3 z == 6, {x, -3, 3}, {y, -3, 3}, {z, -3, 3}] ContourPlot3D[x^2 + y^2 + z^2 - 4==0 , {x, -3, 3}, {y, -3, 3}, {z, -3, 3}] I choose...
7. ### How to show integral identity involving gaussian over x

So I have come across this integral identity in Krall's Principles of Plasma Physics (right after equ. 6.4.4 in the 1st edition) and I have not been able to show the identity is true. The reason that I would like to understand the integral is that I am trying to solve a similar problem to the...
8. ### Unknown Symbol in Molecular Term Symbols

Thank you for your help. I found a reference that give essentially the same information but might be helpful to someone else who stumbles upon this. Molecular Spectra and Molecular Structure, Vol I by Herzberg. The appendix has a list of electronic structures and provides an explanation of...
9. ### Unknown Symbol in Molecular Term Symbols

Thank you gabriels for the fast reply. I have a few follow up questions. If you could recommend a reference that uses this notation that might be easier then answering my questions. Either way is fine by me. From what I have read it makes sense that the X would denote the ground state but...
10. ### Unknown Symbol in Molecular Term Symbols

Hello, I am interested in the electronic states of the N2 molecule. Now it is a homonuclear diatomic molecule and http://en.wikipedia.org/wiki/Molecular_term_symbol" [Broken]) but I do not understand what the Latin letters before the molecular term symbols mean. Here are some of the states...
11. ### Plasmon Physics

Try "Surface plasmon subwavelength optics" WL Barnes, A Dereux, TW Ebbesen - Nature, 2003 http://www.me.berkeley.edu/~lwlin/me118/papers/paper11.pdf "Theory of Surface Plasmons and Surface-Plasmon Polaritons" Pitarke, Silkin, Chulkov, Echenique - Rep. Prog. Phys. 70 (2007) 1-87...
12. ### Physics of a Water Pendulum

does this phenomenon occur no matter how much water you put in the water bottle? I feel like there but be a certain amount of water where this phenomenon would be more pronounced. I haven't thought about your problem long and I am not positive I understand exactly the phenomenon that is...
13. ### E-field from Time Varying B-field of Current Loop

Ah ok good. That is what I had figured. I was later able to reason that my scalar field must be zero everywhere since it would correspond with charges. So it is good that you pointed it out because now I know I was thinking about it correctly. Thank you.
14. ### E-field from Time Varying B-field of Current Loop

I believe what you are referring is the E-field in the loop. The E that is responsible for the current. But I am not interested in the inside of the current loop. Maybe I am misunderstanding what you are suggesting but I do not feel like it would produce the E-field in the regions about the...
15. ### Rocket equation

I hope this isn't too off topic but i think you need [/tex] instead of [tex] at the end
16. ### E-field from Time Varying B-field of Current Loop

I am trying to calculate the E-field from a varying B-field. The B-field is from a current loop. \vec{B}(\vec{r},t)=\vec{B_{0}}(\vec{r})Sin(\omega t) where \vec{B_{0}}= http://www.netdenizen.com/emagnet/offaxis/iloopoffaxis.htm" Now since B is varying with time there should be an electric...
17. ### Plasma Frequency

thank you for your help since the suggestion to do a google search lead me to an article which states "For bulk silver a value of 1 / τ = 2.4 × 10^13 s− 1, is the common text book value used to fit the plasmons resonance near 400 nm." Well this reminded me that the plasma frequency depends on...
18. ### Plasma Frequency

Yeah I have searched google. My only problem is that I have seen values that range from 1300 THz to 24 THz. To just have a value that is within an order of magnitude would be good. Thanks for the reply
19. ### Plasma Frequency

Does anyone know where I can find measured values for the plasma frequency of bulk silver? I would like them to be for light in the Terahertz range. I have looked in all type of book of optical constants and I have searched many different articles. Just a suggestion of where to look would be...
20. ### How to Calculate Transmission Spetrum

I just want to start off by saying thank you for your interest and help. I will try to clarify the best I can but sometimes I have a hard time explaining what I am doing in words. what exactly do you mean by model? I attached a diagram of the geometry. The grating is periodic in the...
21. ### How to Calculate Transmission Spetrum

EDIT: Now that I have thought more I suppose this problem is a classical problem and should therefore be moved to that forum. Sorry for the mistake. Can this be moved? Hi I am working on a simulation trying to model light traveling through a periodic grating with subwavelength apertures. I...
22. ### Is 11 dimensional space infinite?

I am not an expert by any means on this subject but I would think that the answer depends on the definition of parallel. For example, I believe Euclid defined two lines to be parallel if they never intersect. If we can think of this in a similar way then it seems that as long at the two objects...
23. ### Hermitian Conjugates of x, i, d/dx, and a+

Maybe I am missing something obvious but how do you show that x is hermitian
24. ### MATLAB Importing data into MATLAB

I am currently using the program OOPIC Pro to run some simulations. I am suppose to import the data into Matlab to analysis it. The only problem is that the person that I am working with has gone to China for three weeks and I didn't have him show me how to do it. I would really like to make...