نتایج جستجو برای: initio calculation

تعداد نتایج: 116918  

Journal: :The Journal of chemical physics 2015
Hitesh J Changlani Huihuo Zheng Lucas K Wagner

We propose a way of obtaining effective low energy Hubbard-like model Hamiltonians from ab initio quantum Monte Carlo calculations for molecular and extended systems. The Hamiltonian parameters are fit to best match the ab initio two-body density matrices and energies of the ground and excited states, and thus we refer to the method as ab initio density matrix based downfolding. For benzene (a ...

Journal: :Acta crystallographica. Section D, Biological crystallography 2012
Jaclyn Bibby Ronan M Keegan Olga Mayans Martyn D Winn Daniel J Rigden

Protein ab initio models predicted from sequence data alone can enable the elucidation of crystal structures by molecular replacement. However, the calculation of such ab initio models is typically computationally expensive. Here, a computational pipeline based on the clustering and truncation of cheaply obtained ab initio models for the preparation of structure ensembles is described. Clusteri...

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