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CONCEPT OF THE WEEK

The effects of diffraction can be readily seen in everyday life. The most colorful examples of diffraction are those involving light; for example, the closely spaced tracks on a CD or DVD act as a diffraction grating to form the familiar rainbow pattern we see when looking at a disk. This principle can be extended to engineer a grating with a structure such that it will produce any diffraction pattern desired; the hologram on a credit card is an example. Diffraction in the atmosphere by small particles can cause a bright ring to be visible around a bright light source like the sun or the moon. A shadow of a solid object, using light from a compact source, shows small fringes near its edges. All these effects are a consequence of the fact that light is a wave.

USER OF THE DAY

CTPAHHNK
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NEWS

Credit and Time Bound issues
April 28, 2009
A total of 5000 credits have been added to profiles of all active Cosmo@home users. This is meant for expired/failed WUs due to project down-time and to compensate for the earlier low credit per WU payment for resource intensive CAMB 2.16 WUs. Also, the time bound for these new WUs has been incresaed from 10 days to 15 days which should be enough to complete crunching them even on machines ~5 years old.
Apps restored successfully and increase in credits
April 18, 2009
We have restored CAMB 2.16 apps successfully for all platforms so all project specific errors (Signature and/or Checksum) should no longer be present. Also, most WUs for camb 2.16 are more resource heavy than the previous WU's for 2.15 so we have increased the credit for each WU from 140 to 200. If there are any disputes about this we will be happy to address them. If you feel that the credit being given for the 2.16 app, WUs is too little/ too much please start a thread related to this on the Wish List message board. Thank you.
More hardware maintenance
March 27, 2009
After replacing a damaged RAID drive, the server kept throwing I/O errors and kernel panics, which required us to have the motherboard and RAID controller replaced as well. Hopefully this last round of hardware replacements will solve the problem and we will be back up today.
Website back up
March 26, 2009
The website is mostly up and running at the moment. We'll have the project daemons up as soon as possible.
C@H down for server maintanence
March 13, 2009
The Cosmology@home server has been suffering abnormal crashes ever few hours since the campus power outage on March 8, 2009. We will be taking to server offline soon for maintanence and repairs during which time Cosmolosy@home will not run. This website and the forums will also not be accessible at that time. We are working as fast as possible to get the project back up and running to its full potential.
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