نتایج جستجو برای: correlation energy

تعداد نتایج: 1034417  

2004
Daniel de Florian Massimiliano Grazzini

We consider the back-to-back region in the energy–energy correlation in ee collisions. We present the explicit expression of the O(α S) logarithmically enhanced contributions up to next-to-next-to-leading logarithmic accuracy. We study the impact of the results in a detailed comparison with precise LEP and SLC data. We find that, when hadronization effects are taken into account as is customari...

Journal: :The Journal of chemical physics 2008
Chao Wu Sergey V Malinin Sergei Tretiak Vladimir Y Chernyak

We obtain the parameters of the exciton scattering (ES) model from the quantum-chemical calculations of the electronic excitations in simple phenylacetylene-based molecules. We determine the exciton dispersion and the frequency-dependent scattering matrices which describe scattering properties of the molecular ends as well as of meta- and orthoconjugated links. The extracted functions are smoot...

2012
M.J. Rosa K. Friston W. Penny

Dynamic causal modelling (DCM) was originally proposed as a hypothesis driven procedure in which a small number of neurobiologically motivated models are compared. Model comparison in this context usually proceeds by individually fitting each model to data and then approximating the corresponding model evidence with a free energy bound. However, a recent trend has emerged for comparing very lar...

1996
H. Spiesberger

We present a new calculation of the O(rx;) coefficient of the energy-energy correlation function (EEC) using two different schemes to cancel infrared and collinear poles. The numerical evaluation uses the phase space slicing and the hybrid subtraction method. Both schemes converge with decreasing slicing cut. The results are independent of the scheme for small cuts. For the pure phase space sli...

Journal: :Physical review letters 2012
J H E Proll P Helander J W Connor G G Plunk

It is shown that in perfectly quasi-isodynamic stellarators, trapped particles with a bounce frequency much higher than the frequency of the instability are stabilizing in the electrostatic and collisionless limit. The collisionless trapped-particle instability is therefore stable as well as the ordinary electron-density-gradient-driven trapped-electron mode. This result follows from the energy...

Journal: :Optics express 2004
Jing-Yuan Zhang Chao-Kuei Lee J Huang Ci-Ling Pan

We report a new design of single-shot cross-correlation frequency-resolved optical gating (XFROG) with sub femto-joule sensitivity for complete field characterization of ultrashort optical pulse using a 400- nm-pumped type-I noncollinear optical parametric amplifier. Optical parametric gain as high as 10(8) with 0.8-0.9 femto-joules sensitivity had been demonstrated with an un-cooled CCD in thi...

Journal: :The Journal of chemical physics 2013
Shufeng Ye Minzhong Xu Stephen FitzGerald Kirill Tchernyshyov Zlatko Bačić

We report rigorous quantum five-dimensional (5D) calculations of the coupled translation-rotation (TR) energy levels and wave functions of an H2 molecule, in the ground (ν = 0) and vibrationally excited (ν = 1) states, confined inside the octahedral interstitial site of solid C60 with S6 symmetry. Translational and rotational excitations of H2 in this nanocavity have been measured by the inelas...

2017
Takuya Isomura

Mutual information between the brain state and the external world state represents the 6 amount of information stored in the brain that is associated with the external world. On the other 7 hand, surprise of sensory input indicates the unpredictability of the current input. In other words, 8 this is a measure of prediction capability, and an upper bound of surprise is known as free energy. 9 Ac...

Journal: :iranian journal of veterinary science and technology 0
bahman taghipour hesam a. seifi mehrdad mohri nima farzaneh abbasali naserian

negative energy balance in pregnant ewes during last two month of gestation could result in fatal pregnancy toxemia and affects ewe and lamb health. the understanding of variations of energy related metabolites during this critical period may cast light upon to a better management of the situation. this study describes the variations of serum energy related biochemical metabolites at a period o...

Journal: :iranian journal of basic medical sciences 0
ali tayarani department of electrical engineering, ferdosi university of mashad, mashad, iran ali baratian school of pharmacy, mashhad university of medical sciences, mashad, iran mohammad bagher naghibi sistani department of electrical engineering, ferdosi university of mashad, mashad, iran mohammad reza saberi school of pharmacy, mashhad university of medical sciences, mashad, iran zeinab tehranizadeh school of pharmacy, mashhad university of medical sciences, mashad, iran

objective(s): a fast and reliable evaluation of the binding energy from a single conformation of a molecular complex is an important practical task. artificial neural networks (anns) are strong tools for predicting nonlinear functions which are used in this paper to predict binding energy. we proposed a structure that obtains binding energy using physicochemical molecular descriptions of the se...

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