User talk:Sbyrnes321/Archives/2014

Program for animations

Which program do you use to create your GIF animations? Rolancito (talk) 09:02, 23 August 2014 (UTC)

I've made the individual gif images in Mathematica, Python, and Powerpoint, and then stitched them into animations using various methods like Mathematica, Photobie, gimp, imagemagick, and images2gif (images2gif is a Python script, but I stopped using it; imagemagick works better).

If you click any image I've made, then scroll down and click "More details about this file on Wikimedia Commons" (on a computer) or click "Details" (on the mobile site) you'll get the main page about that image, and you'll see an explanation of how I made it including the source code I used (when applicable) :-D --Steve (talk) 12:54, 23 August 2014 (UTC)

Thanks :) Rolancito (talk) 16:41, 23 August 2014 (UTC)

WP:PERM request

After reviewing your request for the account creator right, I have enabled the flag on your account. Keep in mind these things:

• The account creator right removes the limit on the maximum number of new accounts that can be created in a 24-hour period.
• The account creator right is not a status symbol. If it remains unused, it is likely to be removed. Abuse of the account creator right will result in its removal by an administrator.

If you no longer require the right, let me know, or ask any other administrator. Drop a note if you run into troubles or have any questions about appropriate/inappropriate use of the account creator right. Happy editing! — xaosflux ^Talk 16:46, 15 September 2014 (UTC)

Thanks!!! --Steve (talk) 18:09, 15 September 2014 (UTC)

IP block exempt

I have granted your account an exemption from IP blocking. This will allow you to edit through full blocks affecting your IP address when you are logged in.

Please read the page Wikipedia:IP block exemption carefully, especially the section on IP block exemption conditions.

Note in particular that you are not permitted to use this newly-granted right to edit Wikipedia via anonymous proxies, or disruptively. If you do, or there is a serious concern of abuse, then the right may be removed by any administrator.

Appropriate usage and compliance with the policy may be checked periodically, due to the nature of block exemption, and block exemption will be removed when no longer needed (for example, when the block it is related to expires).

I hope this will enhance your editing, and allow you to edit successfully and without disruption. — xaosflux ^Talk 16:46, 15 September 2014 (UTC)

Thanks!!! --Steve (talk) 18:09, 15 September 2014 (UTC)

An invitation, not a request

You might be interested in making some animations on the Casimir effect. In particular, you could make either a spaghetti plot or a sequence of captures of either the position or velocity of a one dimensional wave (by the uncertainty principle you can never see both). The probability distribution can be obtained from Quantum field theory in 1D (still under construction). My instincts tell me that the Casimir effect will occur if regularization includes only 5 or 10 modes.

I do most of my work on Wikiversity for two reasons: (1) I have more freedom to express myself, and (2) I would like to see an evolution from Wikpedia the encyclopedia to Wikipedia/Wikiversity/Wikibooks the encyclopedia/bookstore that includes editable books on all sorts of subjects from all sorts of viewpoints. --guyvan52 (talk) 15:02, 13 October 2014 (UTC)

Clebsch–Gordan coefficients for SU(3)

Hi, I have created and developed a page on Clebsch-Gordan coefficients for SU(3) group. This is my first edit. It will be really great if you take a look at it and propose some improvements if necessary.Arkadipta Sarkar (talk) 16:58, 20 November 2014 (UTC)Arkadipta Sarkar

Sorry, I don't know anything about that topic. (I used to understand it to some extent, but I've forgotten it long ago!) Maybe you should ask instead at Wikipedia talk:WikiProject Physics?

I don't have the energy to read it carefully BUT, superficially, it looks to me like a very polished and professional article. It doesn't look like somebody's first-ever wikipedia article. Impressive! :-D --Steve (talk) 03:53, 21 November 2014 (UTC)

Electron Holes

Hi, We seemed to be in disagreement on Electron holes.

You state that the holes and the electron can move in the same direction but according to the reference you give "Introduction to Solid State Physics' C. Kittlel - I only have the 5th edition - in the the 5th edition look at page 218 figure 10 in the caption it clearly states "the electron and holes drift velocities are in opposite directions".

In your explanation of the electron and holes moving in the same direction " like a bubble in water" - it's impossible to explain how a LED or semiconductor laser emits light. or at least I would be interested to see how you explain the operation of a LED.

I hope we can come to some agreement on this issue.

Best wishes. — Preceding unsigned comment added by Ironside@elec.gla.ac.uk (talk • contribs) 06:27, 8 December 2014 (UTC)

Did you read the rest of that section?

If Kittel says "the electrons and holes drift velocities are in opposite directions", he presumably means the conduction-band electrons, not the electrons near the top of the valence band (which is what the wikipedia article is talking about). That is my strong suspicion. But I don't have the 5th edition to check the full context. If you disagree with me, and feel that "electrons" is not short for "conduction-band electrons" in that sentence, then can you quote a few sentences before and after, and explain the context better?

Conduction-band electrons drift in the opposite direction to holes like you say. :-D --Steve (talk) 13:04, 8 December 2014 (UTC)

Thanks for responding

Yes you're right the caption in Kittel 5th edition specifically refers to holes having a drift velocity opposite to the conduction bad electrons - I think also my point about the LEDs not working is not valid because although the electrons and holes are moving in the same direction they have opposite mass therefore opposite momentum and thus cannot not recombine because that would violate the conservation of momentum.

Although all of this applies really just at zone centre where the electron mass is negative when the electron acquires some momentum its mass becomes positive and it changes direction - that's one way of looking at Bloch Oscillations. Your analogy of the river of with the bubble implies a net flow of negative charge in a p-type semiconductor towards a negative electrode and that is not the case. However, no analogy is perfect and the bottom line is that I'm OK with leaving your description in - because it does bring out the point about the electrons and holes in the valence band moving in the same direction at least at zone centre.

By the way, I have also worked on Quantum Cascade lasers - give my regards to Frederico - let him know I've moved from Scotland to Australia. — Preceding unsigned comment added by Ironside@elec.gla.ac.uk (talk • contribs) 06:51, 9 December 2014 (UTC)

Oh cool! I edited the text to hopefully make it clearer in the future. I agree with everything you say. I will say hi to Federico from you. Thanks again, --Steve (talk) 13:33, 9 December 2014 (UTC)