Results 331 to 340 of about 8,251,356 (397)

Interstellar electron density

Journal of Astrophysics and Astronomy, 1982
We impose the requirement that the spatial distribution of pulsars deduced from their dispersion measures using a model of the galactic electron density (n e ) should be consistent with cylindrical symmetry around the galactic centre (assumed to be 10 kpc from the Sun).
M. Vivekanand, R. Narayan
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Statistical electron densities

International Journal of Quantum Chemistry, 1997
It is known that in numerous interesting systems one-electron states appear with multifractal internal structure. Physical intuition suggest, however, that electron densities should be smooth both at atomic distances and close to the macroscopic limit.
J�nos Pipek, Imre Varga
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A NEW ELECTRON-DENSITY MODEL FOR ESTIMATION OF PULSAR AND FRB DISTANCES

, 2016
We present a new model for the distribution of free electrons in the Galaxy, the Magellanic Clouds, and the intergalactic medium (IGM) that can be used to estimate distances to real or simulated pulsars and fast radio bursts (FRBs) based on their ...
J. M. Yao, R. Manchester, Na Wang
semanticscholar   +1 more source

Electronic extracule densities

International Journal of Quantum Chemistry, 2009
The electronic extracule density is the probability density function for the centre of mass of an electron pair. The first calculations of the extracule density for atomic and molecular systems are reported. Extracule densities for the ground states of the helium, lithium, and beryllium atoms, and the hydrogen and lithium hydride molecules are ...
Ajit J. Thakkar, Nancy J. Moore
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Densities, density-functionals and electron fluids

Physics Reports, 1982
Abstract This review article discusses, from a unified standpoint, three current approaches in applied quantum mechanics that adopt the single-particle density as a basic variable, viz. density-functional theory (DFT), quantum fluid dynamics (QFD) and study of the properties of a system through “local” quantities in three-dimensional (3D) space ...
S.K. Ghosh, B.M. Deb
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Electron Density Fingerprints (EDprints): Virtual Screening Using Assembled Information of Electron Density

Journal of Chemical Information and Modeling, 2010
We have designed a method to encode properties related to the electron densities of molecules (calculated (1)H and (13)C NMR shifts and atomic partial charges) in molecular fingerprints (EDprints). EDprints was evaluated in terms of their retrospective virtual screening accuracy against the Directory of Useful Decoys (DUD) and compared to the ...
Kooistra, A.J., Binsl, T.W., van Beek, J.H.G.M., de Graaf, C., Heringa, J.   +4 more
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Electron-pair density relaxation holes

The Journal of Chemical Physics, 2008
The electron-pair density relaxation hole has been defined as the electron-pair density of the real molecule minus the electron-pair density of a reference system consisting of overlapping, spherically averaged, undeformed atoms, positioned at the molecular nuclear coordinates.
Mario, Piris, Xabier, Lopez, Jesus M, Ugalde   +2 more
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Role of electron–electron coalescence density in density functional theory

International Journal of Quantum Chemistry, 2001
AbstractAn expression for the evaluation of electron–electron coalescence density as a functional of the density for any electron system is proposed. The formula, clarifies previously advanced upper bounds for this quantity and provides a method to independently estimate the system‐averaged on‐top exchange–correlation hole. The relationship with the on‐
E. Valderrama, J. M. Ugalde
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Transformation from metallic electron charge density to electron momentum density

Journal of Physics: Condensed Matter, 1989
There is no direct and exact relation between the electron charge density, rho (r), and electron momentum density, gamma (p). Two approximate methods for transforming from rho (r) to gamma (p) developed in the literature are briefly outlined, and these two methods are applied to metallic Al, V, and Cu.
R M Singru, R R Mishra
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Electron-positron density-functional theory

Physical Review B, 1986
A two-component density-functional theory is presented for electron-positron systems. The phase diagram of a two-component Fermi-Coulomb system is discussed, and explicit expressions are derived for exchange-correlation functionals for use in the local-density approximation.
, Boronski, , Nieminen
openaire   +2 more sources