User talk:Adundovi

Welcome to Wikimedia Commons, Adundovi!

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Tip: Categorizing images

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Hello, Adundovi!

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.

CategorizationBot (talk) 10:35, 23 November 2010 (UTC)

• Image:Pn-junction-equilibrium-graph.svg was uncategorized on 22 November 2010 CategorizationBot (talk) 10:35, 23 November 2010 (UTC)

Hello Adundovi,
thank you for the above svg image. The original version is instructive in showing the effect of differing dopant concentration, which is higher in the p-type material to the left (shaded with a darker gray). To compensate the higher dopant concentration in the negatively charged zone, the width of the positively charged zone is larger. Please, let the number of the positive space charges be equal to the number of the negative space charges.

Correspondingly, in the second diagram, which should be named "charge density" instead of "charge", the shaded areas between the trace and the x-axis should be of the same size, the left one being higher (more negative), the right one being wider.

Correspondingly, in the last diagram, which should be named "electric potential" instead of "voltage", the slope of the trace should increase faster with x in the negatively charged region than it decreases in the positively charged region. This is somewhat exaggerated in the original version, the steepest ascend should be at the position of the contact plane of the two materials. While the zero level of the potential is arbitrary, this very point of steepest ascend may define it. It follows that the ratio of the positive potential of the n-terminal to the negative potential of the p-terminal is the same as the ratio of the dopant concentrations (about 3:2).

Finally, the shading should not be from dark gray to light gray to blue/red to light gray to dark gray, but from dark gray to blue/red to light gray.

Regards - Rainald62 (talk) 00:05, 26 February 2011 (UTC)

Hi! Thank you on constructive comments, I'll try to fix it.

I'll start from the last one to beginning: changed to one unified gradient from dark gray to light gray (p-side is higher dopant then the n-side); changed text to "electric potential" instead "voltage" but difference is only in electric charge which is constant; I've changed slope as you instructed me but I'm not so sure about shape because it's not analytically calculated but arbitrary drawn; renamed "charge" to "charge density"; shaded areas on the charge density diagram are now the same; I don't know how I've missed this charge neutrality on the first place (equal numbers of + i - circles). Is it OK now? Adundovi (talk) 09:24, 10 March 2011 (UTC)