نتایج جستجو برای: effective pair potential

تعداد نتایج: 1765452  

1994
Kevin Cahill

In theories with spontaneous symmetry breaking, the loop expansion of the effective potential is awkward. In such theories, the exact effective potential V (φc, T ) is real and convex (as a function of the classical field φc), but its perturbative series can be complex with a real part that is concave. These flaws limit the utility of the effective potential, particularly in studies of the earl...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده فنی مهندسی 1388

the purpose of this study is identifying effective factors which make customers shop online in iran and investigating the importance of discovered factors in online customers’ decision. in the identifying phase, to discover the factors affecting online shopping behavior of customers in iran, the derived reference model summarizing antecedents of online shopping proposed by change et al. was us...

2009
T. M. Janssen S. P. Miao T. Prokopec R. P. Woodard

We generalize the effective potential to scalar field configurations which are proportional to the Hubble parameter of a homogeneous and isotropic background geometry. This may be useful in situations for which curvature effects are significant. We evaluate the one loop contribution to the Hubble Effective Potential for a massless scalar with arbitrary conformal and quartic couplings, on a back...

2004
S. Kambayashi

The static and dynamic structure of liquid lithium (470 K) in a computer experiment were investigated using a new type of interaction: the pair potential is constructed from an ab initio molecular dynamics method which makes the effective interionic potential self-consistent with the radial distribution functions on the basis of the quantd hypemetted-chain theory. Comparisons of the new calcula...

2017
S. J. Clark T. W. Hollins K. Refson N. I. Gidopoulos

We extend the formalism of local exchange methods to calculate and investigate the electronic structure of metals. It is well-known that the Hatree-Fock method when applied to metals shows unphysical behaviour, however the accurate treatment of exchange via DFT’s exact exchange method (EXX) and using our local Fock exchange method (LFX) can be used to describe metallic band structures accurately.

Journal: :Science 1999
R S Fellers C Leforestier L B Braly M G Brown R J Saykally

A polarizable water pair potential was determined by fitting a potential form to microwave, terahertz, and mid-infrared (D2O)2 spectra through a rigorous calculation of the water dimer eigenstates. It accurately reproduces most ground state vibration-rotation-tunneling spectra and yields excellent second viral coefficients. The calculated dimer structure and dipole moment are very close to thos...

Journal: :Physical review letters 2009
F Huang K Addas A Ward N T Flynn E Velasco M F Hagan Z Dogic S Fraden

We report on the construction of colloidal stars: 1 microm polystyrene beads grafted with a dense brush of 1 microm long and 10 nm wide charged semiflexible filamentous viruses. The pair interaction potentials of colloidal stars are measured using an experimental implementation of umbrella sampling, a technique originally developed in computer simulations in order to probe rare events. The infl...

2009
GAURAV PRANAMI LYUDMILA SLIPCHENKO MONICA H. LAMM MARK S. GORDON

A force matching technique based on previous work by Voth and co-workers is developed and employed to coarse grain intermolecular potentials for three common solvents: carbon tetrachloride, benzene, and water. The accuracy of the force-matching approach is tested by comparing radial distribution functions (RDF) obtained from simulations using the atomistic and coarse-grained potentials. Atomist...

2000
C. von Ferber A. Jusufi M. Watzlawek C. N. Likos H. Löwen

We analyze the effect of polydispersity in the arm number on the effective interactions , structural correlations and the phase behavior of star polymers in a good solvent. The effective interaction potential between two star polymers with different arm numbers is derived using scaling theory. The resulting expression is tested against monomer-resolved molecular dynamics simulations. We find th...

Journal: :Informatics in Education 2015
Despina Tsompanoudi Maria Satratzemi Stelios Xinogalos

Since pair programming appeared in the literature as an effective method of teaching computer programming, many systems were developed to cover the application of pair programming over distance. Today’s systems serve personal, professional and educational purposes allowing distributed teams to work together on the same programming project. The current research focuses in distributed pair progra...

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