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krahulik
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Registrován: úte 09 led, 2007 10:33

Re: BOINC / QMC@Home

#1 Příspěvek od krahulik » úte 22 led, 2008 12:35

pred nedavnem byl publikovan 6 strankovy clanek: prvni vysledky QMC.

Quantum Monte Carlo (QMC) calculations on the stacked (st) and Watson/Crick (wc) bound adenine/thymine (A/T) and cytosine/guanine (C/G) DNA base pair complexes were made possible with the first large scale distributed computing project in ab initio quantum chemistry, Quantum Monte Carlo at Home (QMC@HOME). The results for the interaction energies (wc-A/T = 15.7 kcal/mol, wc-C/G = 30.2 kcal/mol, st-A/T = 13.1 kcal/mol, st-C/G = 19.6 kcal/mol) are in very good agreement with the best known coupled-cluster based estimates. The accuracy of these values is further supported by calculations on the S22 benchmark set of noncovalently bound systems, for which we obtain a small mean absolute deviation of 0.68 kcal/mol. Our results support previous claims that the stacking energies are of comparable magnitude to the interactions of the commonly discussed hydrogen-bonded motif. Furthermore, we show that QMC can serve as an advantageous alternative to conventional wave function methods for large noncovalently bound systems. We also investigated in detail all technical parameters of the QMC simulations and recommend a careful optimization procedure of the Jastrow correlation factors in order to obtain numerically stable and reliable results.

Clanek neni (kvuli k pravidlum zverejnovani vedeckych clanku z oboru), prvni rok po uverejneni volne ke stazeni. Presto kolegove budou hledat zpusoby jak tuto zalezitost resit (homepage)

S klidnym svedomim muzu konstatovat, ze clanek je ciste vedeckeho razu (obrazky, grafy, tabulky diskuse atd.) :smt002

BTW: v soucasne dobe je vypocetni vykon QMC kolem 35 TFlops/s. A v prubehu ledna bude asi na den projekt offline, server bude dovybaven raidem, odstavka bude deklarovana v "news".

//: upravy textu
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