User talk:Alejo2083

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[edit] Super diode

Good work!

I am wondering if we should start a WikiProject for Electronics. — Omegatron 00:20, 15 September 2005 (UTC)

[edit] Dia

How difficult was it to make Image:Star-Triangle transformation.png? I've experimented with dia and couldn't get anything useful out of it.

We have SVG support now, so we can theoretically make high-quality schematics that others can then edit. I tried drawing an example in Inkscape:

The fonts look different, of course.  :-\ Also I drew each component by hand, which is a pain. Now they're in groups that can be copied and pasted, but Inkscape's not really meant for blocks-connected-by-wires-on-a-grid type drawing. Any ideas? — Omegatron 00:36, 15 September 2005 (UTC)

[edit] Dia & Superdiode

Hey, I read the two things you wrote me on my talkpage. I absolutely agree about creating a a WikiProject for Electronics, it would be useful for a sort of unification of the style and planning of the further work.

The main problems are: 1) decide a common style and create some templates, but we can start from an existing stub template 2) we'll have to suggest a common programme to draw circuits, to export in SVG.

I have few ideas, if you agree I'll start writing the article about the wikiproject now, then we'll discuss all the other improvements.

About using Dia for drawing: I tried using it once, but as you can see I made all the other circuits after that with Xcircuit. Dia has some strong limitations: most of the devices are not in the library (I drew only resistors with it!) and you can't rotate objects. In my Image:Star-Triangle transformation.png I made a draft with Dia and I postprocessed it with Gimp (rotating and connecting the resistors, etc.). Drawing something more complicated would be crazy.

I took a look at the Inkscape you told me about: it's the most promising programme, but there are few issues. There is a lot to say about this topic, and if you agree I will write properly on the page of the future wikiproject about electronics. I thought about contacting the developers of the programme, too: wikipedia is important and to be a programme suggested by wikipedia could be important for them, so I think they won't mind adding a few features for us, hopefully with our help.

Alessio Damato 13:43, 18 September 2005 (UTC)

As for the Wikiproject, I just see it as a nice place to discuss things and organize our efforts. "Standardizing" on the electronics articles could be useful, too.
I agree that the interface for Dia is very poor. Inkscape has a pretty good interface and nice output, but it's meant for artistic drawing and not diagramming. I was reading around and they plan to introduce some more diagramming features in the future, but don't want to go too far in that direction for fear of bloating past their primary art focus. They've just added the ability to create program extensions, though, which could be very useful. — Omegatron 04:42, 19 September 2005 (UTC)
Ok, I'll start writing the page for the Wikiproject saying all the problems to solve, and we'll find a solution with the other people that will join (hopefully :-) Alessio Damato 20:53, 19 September 2005 (UTC)


[edit] Barnstar

I, V. Molotov, give you this Working Man's Barnstar for work pertaining to Rome.

Image:WMBarnstar.png

Take care, Molotov (talk) 21:47, 19 September 2005 (UTC)

Thanx :-) Alessio Damato 22:03, 19 September 2005 (UTC)

[edit] Wikiproject about electronics

Hi, I did it: I started a Wikiproject about electronics. The home page is here. Take a look and tell me what you think about it: after that we'll start diffusing it :-) Alessio Damato 18:53, 20 September 2005 (UTC)

I've started adding to it. I think this is a good idea! — Omegatron 20:35, 20 September 2005 (UTC)
Re guidelines - Like everything else on Wikipedia, be bold and if you think they are useful, please feel free to use them. --Wtshymanski 16:03, 20 November 2005 (UTC)

[edit] SVG Bessel plots

Hi, I noticed that you added SVG versions of the plots in Bessel function. In principle, this seems like a good idea to me. However, I have a couple of requests/suggestions.

First, do not use color as the sole way to distinguish between curves. This is problematic for the color blind, and for monochrome display devices. One way to fix this is to also use dashed/dotted lines, etcetera, an even better way is:

Second, it is much better to attach labels to curves directly (see the original versions of the Bessel plots, for example), rather than having a second "legend" box. This avoids an indirection, where the user has to look back and forth between a "key" and the data rather than just at the data; see e.g. Tufte, The Visual Display of Quantitative Information.

Third, I notice that your y-axis label for Image:BesselJ plot.svg falls on top of the tick numbering; please be careful of small glitches like this.

(Unfortunately, gnuplot is not the most flexible plotting tool in the world.)

—Steven G. Johnson 23:57, 9 October 2005 (UTC)

I absolutely agree with you. First I have to improve my knowledge about gnuplot, then I'll work on it. Just in case I could post-process the image with Sodipodi or something like this (as I did for the picture of the Gamma function), but I want to get the best I can from gnuplot first, then I'll make smaller changes with other programs. I'll tell you when I make a sensible change to the plot. Alessio Damato 12:35, 10 October 2005 (UTC)
ok, I did it. I don't think I can get anything better, but according to me it is alright. Take a look at Bessel function. Alessio Damato 12:27, 12 October 2005 (UTC)

[edit] Good work on the Bessl functions

Hi,

Looks like good work on the bessel functions, thanks ! linas 23:10, 12 October 2005 (UTC)

thanx :-) Alessio Damato 14:15, 13 October 2005 (UTC)

[edit] re:Matlab code

Hi there. Sorry to be slow to get back to you.

I made the timing diagrams from the command line and then spent a while tweaking the export options regarding exporting before the final image was useful. The labelling of it I did all in Powerpoint (I think I exported a .eps version from Matlab) since the labelling feature in Matlab is a bit poor and fiddly to use. So I don't have the code I used, although with some legwork I guess I could reconstruct it. I think I'd prefer not to, though, since the .png files we already have are ok enough. The constellation diagrams I made entirely in Powerpoint; Matlab can do that (I believe the Comms toolbox has specific functions for it), but I didn't like the output as much as what I could get in Powerpoint. Using Powerpoint also avoided the need to write any code at all — I just positioned things using the default snap-to-grid things. Unfortunately, neither Matlab nor Powerpoint can export in .svg so I had to settle for .png -Splashtalk 01:19, 23 October 2005 (UTC)

Thank you. That's actually really helpful and explains why it was so damned hard to make the images not scramble when I resized them. I had to spend quite some time playing with the export options so that the timing diags looked ok once they were the size I reckoned they should be. (The constellations weren't problematic; I suppose this is because I made them very big and only use them smaller.) When I find the time, I'll turn them into .svg images...once I work out those two pieces of software you mention. As for posting the Matlab code; I'll think about that case-by-case because I can imagine there are some cases where I would not want to GFDL the code (e.g. if it's part of my PhD or something). Thanks for the insight. -Splashtalk 17:38, 23 October 2005 (UTC)

[edit] Images licensing

Hi. I noticed the really nice picture Image:Rome the sacred area of largo argentina 20050922.jpg. The problem of that image is that you states in its description that the image is released in public domain, but than you added GFDL and CC-by-sa tags. Please, choose either public domain or the GFDL/CC licenses, and correct the page.--Panairjdde 11:10, 21 November 2005 (UTC)

I don't remember exactly, but I think I just wrote what I had found on one of the guidelines of wikipedia. Since I multilicensed it, you can do whatever you want with it. I wrote "to the public domain" because I "copyleft" it (can I say that?! :-)
If what I wrote is a mistake, what should I write to make it more consistent?? Alessio Damato 16:53, 22 November 2005 (UTC)
It is not a problem of compliance with WP policy, but a matter of "logic": how is it possible that a file is at the same time of your intellectual property (as stated when you choose GFDL/any other license) and of public domain? If you want to be the owner of the Intelectual property of your works, remove the public domain tag, if you want to release it in the public domain, the GFDL tag is useless.--Panairjdde 11:38, 24 November 2005 (UTC)

[edit] Gnuplot supports the SVG output

Hi I was interested in your comments on Edsanville's page re: Gnuplot and SVG. Do you know of a reference that explains (i.e. teaches) how to make images and animations with the Gnuplot and SVG? Sholto Maud 04:44, 19 December 2005 (UTC)

As far as I know, there isn't any howto for making SVG with Gnuplot in particular. Gnuplot is a program for plotting, and it exports in several formats; one of them is SVG. That's it. Any tutorial is fine. Anyway I didn't find anything simple when I was looking for it, so all I can suggest you is this: take a look at the pictures other users did, make your own modifying the code other people used. In particular, I put in User:Alejo2083/Pictures_SVG all the SVG pictures I made with the code I used (just click on them): you could start from that.
You can't create animations with Gnuplot. I don't know any (free) program to do it, but I don't think Wikipedia supports it, yet. Alessio Damato 19:06, 19 December 2005 (UTC)
See Wikipedia:How_to_create_graphs_for_Wikipedia_articles#SVG — Omegatron 17:43, 15 May 2006 (UTC)

[edit] SVG version of Image:Single-phase_transformer

Hi Alessio, thanks for your comments! I actually wasn't aware that SVG images could be uploaded, so I converted it to PNG first. I've uploaded the file now to Image:Single-phase transformer.svg on the Commons. It appears that some of the formatting hasn't come across quite right: the flux symbol for example has disappeared, and the subscripts on the number of turns look a bit funny. I guess these can be sorted with a little work and I can reload the file. Is there a particular reason that SVG should be preferred over PNG? regards, --BillC 20:15, 19 December 2005 (UTC)
PS: Don't forget to sign my guestbook! :-)

Okay, I have uploaded a new version of the file; it is the one currently at Transformer. I had to separate the text with the subscripts into two blocks to get it to show properly. The flux symbol Ø is now just an ellipse with a line drawn through it. The image looks 'crisper', though.
To answer your questions, no, I worked the image from scratch and from memory. It was the first full image I had ever drawn with Inkscape. I'm still learning; here is an animated image I'm working on now to illustrate three-phase power-flow: http://img527.imageshack.us/my.php?image=360deganimation2sm.gif. (Any tips appreciated.) --BillC 01:11, 21 December 2005 (UTC)
For some reason, the flux symbol disappeared altogether first time round, so I redrew it as a circle with a line through it. There might have been a problem with mixing font symbols in the same line of text. I have now given it a second go, this time creating a new text entity. --BillC 22:29, 21 December 2005 (UTC)
Nope, it's not working. A black rectangle keeps appearing in the image. It's not present in the file I'm working on. One of the arrowheads is going missing, and the flux symbol is becoming much smaller as well. For the time being, I have reverted Transformer back to using the original PNG file. Perhaps you could offer some advice. I can e-mail you the SVG file if you're interested. --BillC 22:51, 21 December 2005 (UTC)
Hello again. For your info, I finally sorted the problem with uploading the SVG file. (There's a new one now at Transformer.) There was a strange entity hidden in the file called "svg:FlowRegion". I had to remove it with Inkscape's XML editor as it was not selectable (or viewable) on screen. --BillC 00:07, 30 December 2005 (UTC)
Thanks for your comments. I got rid of the black rectangle as I say in my message above. The problem with the Greek Phi appeared to be because I was trying to mix both Latin and Greek fonts in the same text object, something Wikipedia's SVG engine obviously didn't like. With the new drawing, the 'Magnetic Flux' is one text object, and the Phi is another. I'm not sure what was happening with the arrows, but the problem seems to have gone away. My latest work is here, started with Inkscape and animated with Adobe ImageReady, but it needs a little more work at the moment. Happy New Year! --BillC 18:01, 2 January 2006 (UTC)
Hi Alessio, thanks for your message. I've left it too late today to reply, but I will do tomorrow. --BillC 02:01, 4 January 2006 (UTC)
Sorry for taking the time to get back to you. With regards to changing the arrow direction on the secondary, I guess I was succumbing to peer pressure on the FA page. However, I have been searching the web today, and the pages I could see showing a similar circuit diagram seemed to be fairly evenly divided as to whether the secondary current is showing entering or leaving. Of course, it can easily be changed in the image. If you think it is important, I guess you could say so on the featured article page and a new version be uploaded. With regards to The Commons, there was no real reason to not upload it there. Can it be done there as well, or does it need to be renamed, or something? --BillC 17:11, 4 January 2006 (UTC)

[edit] Image:BesselI plot.svg

Please correct the labels on Image:BesselI plot.svg, which incorrectly say "J_n" instead of "I_n". thanks! (While you're at it, proper subscripts instead of underscores, and a larger font on the labels, would be nice.) —Steven G. Johnson 03:14, 25 January 2006 (UTC)

I fixed everything, I uploaded the new version but I can't see it! I uploaded it twice (see the history on commons) but the rendered picture does not change, neither does the SVG source. Is it a bug or should I wait for a while?? Alessio Damato 22:26, 25 January 2006 (UTC)
I can see it; it looks greatly improved, thanks! If you get a chance to similarly update the fonts for the other plots on that page that would be great. (Another nice touch, by the way, would be to make the labels the same color as the corresponding curves.) —Steven G. Johnson 19:20, 26 January 2006 (UTC)
I did it again! Alessio Damato 19:53, 27 January 2006 (UTC)
I just noticed another error. You label the curves I_1, I_2, and I_3, when I think they should be I_0, I_1, and I_2. Please upload a corrected figure when you get a chance, thanks! —Steven G. Johnson 01:33, 14 March 2006 (UTC)
I uploaded the new version but I can't see it!
Ok, that happens to way too many people. I am going to see if I can add a message to the upload thing reminding people to bypass their cache. :-) — Omegatron 03:51, 14 March 2006 (UTC)

I fixed the labels myself, never mind. —Steven G. Johnson 20:10, 14 March 2006 (UTC)

[edit] Beer Categories

It has been suggested by User:BrianSmithson that the Beer and brewery categories should be renamed. The proposal has been supported by User:Syrthiss, and supported and expanded by myself. The notion is that the regional categories should follow the format of "Beer and breweries in Africa" /Europe/Asia/North America/South America/Oceania. "Brewers and breweries" could also be renamed "Beer and breweries by region". And all the countries should also be renamed (and merged if needed) as, for example, "Beer and breweries of Germany", "Beer and breweries of Britain", "Beer and breweries of Poland". The word in each case would be beer rather than beers to allow for general articles on beer culture in each region as well as individual beers.

Comments, suggestions, objections and simple votes to Wiki Beer Project SilkTork 15:01, 3 April 2006 (UTC)

[edit] Please Help

 Thank you for your support of the Article Improvement Drive.
This week Rome was selected to be improved to featured article status.
Hope you can help.
Posted by (^'-')^ Covington 01:41, 10 May 2006 (UTC) on behalf of the the AID Maintenance Team

[edit] Image:Dandelion clock dft dct.png

Hi, I noticed you posted Image:Dandelion clock dft dct.png. Thanks! It might be clearer if you didn't center the FFT spectrum, however. (Note also that you can use the fftshift command instead of using the (-1)^(i+j) trick, which only works for even sizes.)

—Steven G. Johnson 23:45, 12 May 2006 (UTC)

If you were only showing the FFT spectrum, I would agree that you should center it. The reason I don't think you should center it here is because you are comparing it to the DCT spectrum, which is not centered. For purposes of comparison, you should make the two plots as similar as possible. (Arguably, you should also remove half of the FFT image since half of it is redundant for the transform of a real image.) —Steven G. Johnson 16:42, 13 May 2006 (UTC)

Your revised image still has three problems:

  • You didn't correct the FFT histogram (it is still centered)
  • You plotted 1/4 of the FFT image instead of 1/2. This is questionable because 1/4 of the image does not show all of the non-redundant magnitudes.
  • You rescaled the 1/4 FFT image so that it is the same size as the DCT image. This is misleading because the DCT image now has a higher resolution. If you want to compare the energy localization, the pixels must be the same size. Thus, if you show 1/2 of the FFT image as I suggest then the FFT image plot should be 1/2 the size of the DCT plot.

Thanks for your efforts.

—Steven G. Johnson 16:58, 13 May 2006 (UTC)

[edit] Super diode

I like the new SVG images. Can you make one for a full-wave rectifier, too? — Omegatron 17:41, 15 May 2006 (UTC)


[edit] What Is the Basic Idea behind a Negative Impedance Converter?

Alejo2083, I would like to participate in writing the page about one of the most interesting electronic circuits -- Negative impedance converter (as I can see, you have begun creating this page). I have been trying to reveal the secret of this "mystic" circuit from many years. Now, I have the feeling that I have managed to grasp the basic idea behind it; so, I would like to share my penetration with Wikipedia audience.

According to Wikipedia conventions, I have first exposed my suggestion on Talk:Negative impedance converter. I would be glad, if you and other Wikipedians who love exotic circuits join this discussion.

I have also tried to resume the discussion about Current source and the dual Voltage source −- see Talk:Current_source#New_structure. Circuit-fantasist 18:00, 7 July 2006 (UTC)

[edit] Poll

Your vote/opinion on brewery notability is requested here: [1] SilkTork 12:07, 20 July 2006 (UTC)

[edit] Tex

Aiuta!

Do you know how difficult is using Tex in Wikipedia? can you see this article : http://es.wikipedia.org/wiki/M%C3%A9todo_de_planos_de_corte i have tried so long repaired it but i couldn't ... thanks :)

Carlos

News, i think i solve it, my still F*** up, i don't understand why sometimes the image png not appears, i have tried to make a lot of pieces of iso − 8859 − 1

[edit] Commons

If you are not going to respond to your Commons talk page, you should redirect it here or say on it that you want people to contact you here. — Omegatron 21:17, 18 September 2006 (UTC)

I replied on Commons Alessio Damato 18:10, 19 September 2006 (UTC)

[edit] Photography WIkibook

Hi Alessio,
Yeah I would be very interested in contributing, give me a couple of days for me to get some uploading out of my system (I've been restraining myself for like 2 months now with exams and stuff)! Then I'll have a shot at writing something. --Fir0002 04:24, 20 November 2006 (UTC)

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