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Very nice information. In particular I found the excel data file with the solar spectra (AM 1.5 etc.). Can I use the data for a diagram in a text book about compound semiconductors which I currently write? What kind of reference should I indicate?

Best regards

Ferdinand Scholz

Prof. Dr. Ferdinand Scholz
Institut für Optoelektronik
Universitaet Ulm
Albert-Einstein-Allee 45
89081 Ulm
Tel. (++49) (0) 731/50-26052, Sekr. -26050
Fax (++49) (0) 731/50-26049

If I click the constants in Module circuit design page. It shows the requested page not found.
It because due to misspelling of url, It's actually but it shows

I have been referring to this site earlier as well and find it very much helpful.

Read your post about SPAM incident. Happened to be cruising IT utility sites and ran a site-test on
The results stated there was one url in plain text that would bu used for SPAM. The free site is ''.
A quote from the results:
Email Privacy Warning! At least one email address has been found in plain text. Your email address will be used for spam. Please consider one of these options:

1. Integrate a contact form on your site.
2. Make it difficult for spam bots by using an obfuscator: Email Address Obfuscator"

Thank you for the website, the best of its kind.

Привет всем. Посоветуйте, кто может выполнить услугу разработка сайта

Знаю только этих ребят из . Работали давно и все качественно, но сейчас у них очень много заказов, а я подождать не могу.

Спасибо всем за помощь. Жду ваших советов.

I am a new beginner in the field of solar energy since my specialization is a mechanical engineer and I have experience in electronics and electricity. Can I be a professional in renewable energy?

Yes you absolutely can! Maybe you have already become a renewable energy professional given that it's already a year since your post. :)

I am very thankful for always using wonderful teaching materials. Interactive Graphs on the web has not been displayed successfully recently. I tried it with Chrome, IE and Firefox as the latest FlashPlayer but it did not work. What should I do?

An excellent tool for learning principles of PV. It is a great information resource for applicable studies.
Thanks to all professionals involved in this contribution to a clean energy source planet. ;)

How do I get the copyright permission?? Thanks.