Novinky z projektov

On 2 Feb 2012, 21:30:55 UTC, PrimeGrid’s The Riesel Problem project eliminated k=162941 by finding the prime: 162941*2^993718-1 The prime is 299,145 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 1536th overall. This prime was found while exploring a suspected gap in a previously searched range. This is PrimeGrid's 8th elimination. 56 k's now remain. The discovery was made by Dmitry Domanov (unconnected) of Russia using an Intel Xeon @ 3.60GHz with 2 GB RAM running Windows Server 2003 Enterprise x86. This computer took just over 1 hour 5 minutes to complete the primality test using LLR. Dmitry is a member of Team Russia. For more details, please see the official announcement.

It turns out that some of the WUs cannot download the input files (they were missing); these files have been created now.

Due to a disk failure on one of the servers, the database and the replicated copy of it got corrupted. A restore was done from a known working backup of yesterday. Some WUs which were send out in the mean time might have been lost due to this. Currently the project runs on just one of the servers, later this week the second server will be put to action again. Sorry about that!

With the new server software release installed in the end of January we experienced that many more workunits are sent to the hosts as usual. We are currently investigating this, seems that the project contiguration settings are differently interpreted by the new software. To avoid total overload of hosts by SIMAP results, we have reduced the daily maximum number of results per host to 300. We will check and adapt this limit during the next days continuously. Best regards Thomas

Einstein@Home volunteers have discovered three new radio pulsars in Arecibo PALFA data -- the eighth, ninth and tenth new radio pulsars found by Einstein@Home volunteers in this data set! Congratulations to:

• Peter van der Spoel, Utrecht, the Netherlands
• Edvin Grabar, Pula, Croatia
• Shadowfax, Baltimore, Maryland, USA
• Cauche Nathanael
• John-Luke Peck, TerraPower & Intellectual Ventures, Seattle, Washington, USA
• Mark Henderson, Morristown, Tennessee, USA

Further details about these newly-discovered pulsars can be found on this web page, and will be published in due course. Bruce Allen Director, Einstein@Home

Come join us in laid-back competition in tribute to the number 2...the first prime and the only even prime. The prizes are simple colored jerseys . Yellow for the most primes, Green for the highest prime score, and Polk-a-dot for the most primes on 19 Feb. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2012.

As I am in the final months of my phd thesis, I didn't have (and won't have) enough time in the coming weeks to take care of POEM@HOME. Therefore there will be some new faces in the coming weeks on the POEM@HOME message boards (and behind the scenes). I really had a blast working with POEM@HOME and will still be available for consulting for the new team. Thank you everybody for all this help, as without you my phd thesis wouldn't have been possible. - Timo Strunk Deutsch: Da ich in den letzten Zügen meiner Doktorarbeit stecke, hatte ich nicht genug Zeit um mich um POEM@HOME zu kümmern (und werde auch leider nicht genug haben). Daher werde ich meine Arbeit nun an ein neues Team übergeben, welche sich demnächst auf den Message Boards vorstellen werden. Ich werde dem Team natürlich auch weiterhin bei Problemen helfen. Danke an alle hier für eure immense Arbeit. Ohne euch wäre die ganze Forschung und auch meine Doktorabeit keinesfalls möglich gewesen. - Timo Strunk

First, please excuse the long phase where we have reported nothing new. Thomas has become the successor of Mr. Hartmann and manages now the labs "Compuattional Science Lab" and "Technical Computer Science". This was and is a lot of work and therefore Spinhenge@home came a little bit too short. Second, the forum is now back online. It can be reached here. Third, we are currently reorganizing our software architecture for the client application which unfortunately takes much more time than planned. One thing is that we want to merge all input information in just one compact file, so that we can save space and time on your computers. Also, we are implementing several new functions. Most important for us now is a new method that allows us to simulate a magnetic nano system which is subject to a time dependent magnetic field. With this we are able to calculate the so-called AC susceptibility for a system which gives us information about its internal energy barriers. This property is vital for identifying so-called single molecular magnets (SMM). These SMM are candidates for future memory devices since they allow to store information in a much smaller space than conventional magnetic recording materials. The implementation of this method is not that easy and requires the numerical solution of stochastic differential equations which simulate the dynamics of the individual magnetic moments in a nano system. The first big chunk of this task is done and successfully tested (many thanks to Andrértmeier!). We hope to be able to do first test calculations using the new client application soon! Fourth, we are currently planning the reorganization of our server infrastructure. The three project server should run in the future in a virtual environment. Please keep fingers crossed! And thanks a lot for your patience! Kind regards, Christian Schrö der, Thomas Hilbig

On 29 Jan 2012, 08:10:03 UTC, PrimeGrid’s PRPNet found the largest known generalized Cullen prime: 427194*113^427194+1 The prime is 877,069 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for generalized Cullen primes and 57th overall. The discovery was made by Ricky L. Hubbard of the United States using an AMD Phenom II X6 1090t @ 3.2GHz with 8GB RAM, running Windows 7. This computer took 7 hours and 15 minutes to complete the probable prime test using pfgw64 and 7 hours 20 minutes to complete the primality test again using pfgw64. Ricky is a member of the AMD Users Team. For more details, please see the official announcement.

Journal post from David BakerLast year we described in Science magazine the design of a new enzyme which catalyzes a chemical reaction called the Diels Alder reaction involving the formation of two carbon-carbon bonds. This reaction is interesting because no natural enzymes are known to catalyze the reaction. However, it wasn't a very good enzyme, and we asked FoldIt players to try to improve it. As described in Nature Biotechnology this month, remarkably FoldIt players were able to make the designed enzyme 20 times faster by inserting a completely new loop which helps the enzyme bind the chemicals it links together. The combination of Rosetta@Home and FoldIt is turning out to be powerful indeed for solving challenging problems in biomedicine!

Check the unOfficial Muon Blog where you can see the best design of the Linac900Removable6c2 lattice. This result was returned by yoyo@home.

The workunits for the about 410.000 new protein sequences (for the February release of SIMAP) will be available from Wed, Feb 1. We estimate that the batch for February will need about two weeks of work. Best, Thomas

Same as Linux which was fine. If it works we will update the production apps. Again only minor changes. gdf

A new app is up for test. Only minor revisions. gdf

I will be in London from 15. Feb - 19.. If somebody want's to go for a beer and chat about nearly everything drop me a mail. -yoyo-

February is just a week away which means it is time for the 4th annual Tour de Primes. 2 is the first prime number...and the only even one. Therefore, we have declared February, the 2nd month, as prime month. We're offering a small informal competition in tribute to this unique prime number. There are no points to be gained or awards to be won...just a simple rare jersey (Yellow, Green, and Polk-a-dot) at the end of the month to add to your badge collection. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2012.

The main BOINC server needs to be rebooted - we will be down for 15 Minutes in about 2 hours. Sorry for the inconvenience.

We are experiencing some problems with our database and thus D@H is very slow. We are temporarily stopping the generation of new jobs. We are collecting results.

You are seeing it :). Check your Account page too.

The Dragon, the mightiest of all the signs, is a creature of myth and legend. In Asia, the Dragon is an auspicious creature, a symbol of benevolent power, strength and good luck and capable of great good. 23 January 2012 marks the start of the Year of the Dragon. Let's see if we can channel that Dragon energy to find some primes for the start of PrimeGrid's 2012 Challenge Series. A 5 day Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. For more information, please see this forum thread.