User talk:Oleg Alexandrov

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Re: your RfA[edit]

Hi Oleg,

Regarding your RfA, I was just a bit puzzled by your comment that you want to delete old revisions of your files. There is not really any reason to do this, since deleted files are still kept in storage - so it doesn't save any space. cheers, pfctdayelise (说什么?) 03:30, 14 April 2007 (UTC)[reply]

OK. I must confess I did not do my homework for this RfA. :) Thank you for your note. I may try my luck later should I feel that having admin privileges at commons would be useful. Oleg Alexandrov 05:20, 14 April 2007 (UTC)[reply]
No prob. :) BTW, my personal feeling is that admins here should be part of the community here, regardless of where else they edit. So although appealing to your experience on enwp might be one way to show that you're trusted, it's not such a convincing demonstration that you're trusted here. The reason is that we have distinct policies and maybe a distinct community feeling. Personally I want admins that are going to carry out actions in a "Commons way", not an "English Wikipedia way" (or any other wiki). cheers, pfctdayelise (说什么?) 06:20, 14 April 2007 (UTC)[reply]

Image links[edit]

Hi Oleg. You've recently changed Image:Finite Differences.png and some more. Firstly: thanks, it looks better now. Secondly: I wanted to ask how can I check the usage of an Image on commons in other wiki project, because the page on Commons sais: "There are no pages that link to this file." Thanks, Mintz l 15:33, 24 May 2007 (UTC)[reply]

You're welcome. Usually I like to make the details larger, so that they can be seen in a thumb, so the lines thicker, fonts bigger, etc.
Now, to see the usage, visit the image, say Image:Finite Differences.png, and look at the top there is a "check usage" tab. Note that that tool does not always give very accurate results since the database it searches can be a few hours or days out of date for non-English Wikipedias (and a few months for the English Wikipedia). Cheers, Oleg Alexandrov 02:13, 25 May 2007 (UTC)[reply]

Image:Simple harmonic oscillator.gif[edit]

Hi Oleg, I saw the image you made, well done, could you do one with damped oscillations ? that could be useful to train students. Thanks Dingy 02:58, 24 June 2007 (UTC)[reply]

Good idea. Will do. I am still tweaking the undamped one now. Oleg Alexandrov 03:08, 24 June 2007 (UTC)[reply]
Done, Image:Damped spring.gif. Thanks for the idea! Oleg Alexandrov 04:00, 24 June 2007 (UTC)[reply]

Travelling wave[edit]

Hello Oleg, I saw with interest , and would like to mention the use of travelling waves to explain voltage variations on a line when a switch interrrupts (on the left side of the line) a fault due to a fault (on the right side of the line). There are similar reflections at the fault point and at the open point (although the amplitude is doubled there), you can see that on page 35 of [1]. Do you think an image could be done as you did with Wave equation 1D fixed endpoints, as there are two waves moving in opposite directions maybe several images are necessary ? Dingy 03:15, 24 August 2007 (UTC)[reply]

I will think about how I could implement this. Oleg Alexandrov 03:09, 30 August 2007 (UTC)[reply]
Thanks. Dingy 05:08, 1 September 2007 (UTC)[reply]
I looked at that paper. I must say I don't understand very well what is going on there, and how to apply the wave equation to get the kind of behavior you would like to see (I don't completely understand the behavior you need either).
Also, on what Wikipedia page could this figure be used?
If you know better these things, you could perhaps be able to adapt the code to the picture above (it is available on the picture page), to do the movie you want. Or, if you could tell me the exact mathematical equations, I could modify the code myself. Oleg Alexandrov 04:15, 4 September 2007 (UTC)[reply]
I made this image, for the en:Transmission coefficient (optics) article. It is not quite what you wanted I guess, but I made it inspired by your suggestion. Thanks! Oleg Alexandrov 06:05, 26 November 2007 (UTC)[reply]
Hi, that's good ! you could combine it with to have the reflection at the open point Dingy 02:32, 2 December 2007 (UTC)[reply]
But where is the open point? Oleg Alexandrov 05:58, 2 December 2007 (UTC)[reply]
In the case I am interested in, it is the point on the left. When the wave coming from the right reaches an infinite impedance it does not change sign and is doubled in amplitude, it then goes on like the one you just did Partial transmittance with oposite sign. Dingy 07:29, 2 December 2007 (UTC)[reply]

Image:Improperintegral1.png[edit]

Image deletion warning Image:Improperintegral1.png has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.

If you created this image, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. If the file is up for deletion because it has been superseded by a superior derivative of your work, consider the notion that although the file may be deleted, your hard work (which we all greatly appreciate) lives on in the new file.
In all cases, please do not take the deletion request personally. It is never intended as such. Thank you!

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Moloch981 09:47, 25 November 2007 (UTC)[reply]

Fourier Wave on a Disc[edit]

Hey Oleg,

I noticed this image on the Fourier Series page:

Its description indicates that a Fourier series is the solution to the wave equation on a disc. The problem of finding the solutions to the wave equation on a disc is typically solved in cylindrical coordinates. The solution in that particular coordinate system would be a Bessel function. You could of course write that solution as a Fourier series (this amounts to a simple change of basis), but that wouldn't really serve the purpose of demonstrating to the reader what a Fourier series in 2-dimensions looks like. It seems like it really should be replaced with a similar image showing solutions to the wave equation on a square or removed entirely.

Let me know if I should give a more detailed response or a proof. Thanks.

I am fully aware of what you are saying. I did not put the picture on the Fourier series page. I suggest you raise this at en:talk:fourier series. Oleg Alexandrov 04:11, 24 May 2008 (UTC)[reply]

Image:UCLA Bruin.jpg[edit]

Oleg, I've deleted this image as it is a two dimensional representation of a three dimensional work of art. Per US Copyright Act of 1976, § 106(2), who owns copyright of the original has the exclusive right to authorize derivative works. The statue was dedicated in 1985 [2], so it is not PD by way of age. Thought you'd like to know, --Durin (talk) 15:28, 22 August 2008 (UTC)[reply]

Vibrations of drums[edit]

Just a word of gratitude for putting up the vibrational modes of circular membranes. I intend to use them in my General Chemistry 101 course as a step up to atomic orbitals. I think it will help a lot to get idea of nodal lines and nodal circles (and implicitly: quantum numbers) across. Any visual support for that is very welcome because freshmen find atomic orbitals very puzzling and difficult to grasp.

Besides they love a cool simulation... Jcwf (talk) 18:58, 22 August 2008 (UTC)[reply]

You're welcome. Oleg Alexandrov (talk) 00:19, 2 September 2009 (UTC)[reply]

Tip: Categorizing images[edit]

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Hello, Oleg Alexandrov!
Tip: Add categories to your files
Tip: Add categories to your files

Thanks a lot for contributing to the Wikimedia Commons! Here's a tip to make your uploads more useful: Why not add some categories to describe them? This will help more people to find and use them.

Here's how:

1) If you're using the UploadWizard, you can add categories to each file when you describe it. Just click "more options" for the file and add the categories which make sense:

2) You can also pick the file from your list of uploads, edit the file description page, and manually add the category code at the end of the page.

[[Category:Category name]]

For example, if you are uploading a diagram showing the orbits of comets, you add the following code:

[[Category:Astronomical diagrams]]
[[Category:Comets]]

This will make the diagram show up in the categories "Astronomical diagrams" and "Comets".

When picking categories, try to choose a specific category ("Astronomical diagrams") over a generic one ("Illustrations").

Thanks again for your uploads! More information about categorization can be found in Commons:Categories, and don't hesitate to leave a note on the help desk.

BotMultichillT 06:07, 30 May 2009 (UTC)[reply]

Thanks for the surface of revolution figure![edit]

Hi. Just wanted to thank you for making the surface of revolution figure available as free information. I've used it in a book: http://www.lightandmatter.com/html_books/genrel/ch07/ch07.html . The book is CC-licensed, and you are properly credited in the photo credits section in at the end of the pdf version. Regards, Ben

You're welcome. Oleg Alexandrov (talk) 05:32, 16 September 2010 (UTC)[reply]

File:Measure illustration.png[edit]

Hello Oleg, the SVG source you added to the pre-rendered version seems to be not processible by inkscape (0.48) and Firefox (3.6.12). Can you correct it? Best regards --Uncopy (talk) 11:04, 29 October 2010 (UTC)[reply]

Commons:WikiProject Romania[edit]

Hi! I created the Commons:WikiProject Romania as a sister project to the multilingual WP:ROMANIA versions (currently en, fr, ro and ru) to better organize, categorize and improve the quality of media and galleries related to Romania and the Romanians. From your contributions, I think you might be interested and maybe you wish to join and support the project. Your input is welcomed! Thanks and best regards!

--Codrin.B (talk) 22:51, 3 February 2012 (UTC)[reply]

Notification about possible deletion[edit]

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Affected:


Yours sincerely russavia (talk) 06:14, 10 June 2012 (UTC)[reply]

Copyright status: File:Topological vector space illust2.svg[edit]

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JuTa 19:01, 22 June 2013 (UTC)[reply]

Copyright status: File:Topological vector space illust1.svg[edit]

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Thanks for uploading File:Topological vector space illust1.svg. I notice that the file page either doesn't contain enough information about the license or it contains contradictory information about the license, so the copyright status is unclear.

If you created this file yourself, then you must provide a valid copyright tag. For example, you can tag it with {{self|GFDL|cc-by-sa-all}} to release it under the multi-license GFDL plus Creative Commons Attribution-ShareAlike All-version license or you can tag it with {{PD-self}} to release it into the public domain. (See Commons:Copyright tags for the full list of license tags that you can use.)

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JuTa 19:02, 22 June 2013 (UTC)[reply]

File:Box of Nestlé Drumstick ice cream cones.jpg[edit]

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Josve05a (talk) 17:26, 3 December 2014 (UTC)[reply]

Drum_vibration_mode01.gif etc.[edit]

Hi Oleg, I really like the three pictures File:Drum_vibration_mode01.gif, File:Drum_vibration_mode02.gif, File:Drum_vibration_mode03.gif. However, there is a crucial problem when depicting the three of them next to each other (most common use of the three files): the frequencies of the three modes should differ (02 has two periods within the time slot when 01 has 1 period; the frequency of 03 is three times that of 01), shouldn't they? I guess that is easy to fix by choosing different values of N for the three cases (something like N=30, N=15, N=10 ??). Also, when looking at your code, you seem to iterate from 1:N-1 where I would have expected 1:N or 0:N-1. If after three cylcles of 03 you do not end up with exactly 1 cycle of 01 then that may be the reason. Note: If you do not get timely replies on your answer over here, please write me on my discussion page on the German Wikipedia. Best regards, --Dogbert66 (talk) 12:05, 6 January 2015 (UTC)[reply]

Possibly the modes are not 01, 02, 03 but 01, 03 and 05 with different frequencies as described above?? --Dogbert66 (talk) 12:34, 6 January 2015 (UTC)[reply]
Thank you for your note. I guess you are right. I must say that it has been so long that I worked on these that I would rather not revisit the whole thing. Next to each other they look as if they vibrate in unison. I never thought of how their frequencies of vibration actually compare physically. Yes, I iterate from 1 to N-1 , because, given the parametrization chosen, N would be same as 1, that is, T(1) = 0, and T(N) = 2*pi/q, which is the period of those waves. Oleg Alexandrov (talk) 23:40, 30 July 2017 (UTC)[reply]
Thank you for your reply. Ok, I will try and find some other means to adjust the frequency and upload a new version, eventually. --Dogbert66 (talk) 09:28, 31 July 2017 (UTC)[reply]
Hi Oleg, see the discussion pages of the three files for my notes on the anticipated changes. --Dogbert66 (talk) 00:12, 9 August 2017 (UTC)[reply]
Dogbert66, go ahead. Oleg Alexandrov (talk) 03:44, 9 August 2017 (UTC)[reply]

Done. See the 3 files and their resp. discussion pages. Changes on Wikipedia pages are this change on the German Wikipedia, as well as this on on the Spanish Wikipedia. Thanks a lot to you for the original pictures. --Dogbert66 (talk) 14:49, 9 August 2017 (UTC)[reply]

File:Unit disc.svg[edit]

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Rubber Duck (☮ • ✍) 03:17, 10 February 2015 (UTC)[reply]

File:GNU Emacs 23.1.1.png[edit]

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2001:2003:54FA:2232:0:0:0:1 18:14, 29 August 2017 (UTC)[reply]

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