Results 271 to 280 of about 100,146 (306)

Approximate range closest-pair queries

Computational Geometry, 2020
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Jie Xue 0003, Yuan Li 0013, Ravi Janardan   +2 more
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The imperfect pairing approximation

Chemical Physics Letters, 2000
Abstract We present a wavefunction intended to model the static correlation of molecular systems. This wavefunction is best understood as a generalization of the perfect pairing (PP) approximation, and it is therefore termed the imperfect pairing (IP) approximation.
Troy Van Voorhis, Martin Head-Gordon
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Approximate merging of a pair of Bézier curves

Computer-Aided Design, 2001
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Shi-Min Hu 0001, Rou-Feng Tong, Tao Ju, Jia-Guang Sun 0001   +3 more
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Pairing approximation in spherical nuclei — I

Il Nuovo Cimento B Series 10, 1967
The pairing theory (BCS-method) is applied to spherical nuclei in order to calculate some characteristic physical properties. The main points are: i) insertion of an effective (realistic) two-nucleon force in the pairing matrix elements; ii) definition of a phenomenological nuclear potential in order to determine the single-particle states.
K. Bleuler, M. Beiner, R. de Tourreil
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A Pair-Approximation Model for Spatial Patterns in Tree Populations with Asymmetrical Resource Competition [PDF]

Mathematical Population Studies, 2013
A pair-approximation model for the spatial dynamics of a height-structured tree population is defined on a regular lattice where each site can be in one of three states: empty (gap site), 10 occupied by an immature tree, and occupied by a mature tree.
Josep L García-Domingo, Joan Saldaña
exaly   +3 more sources

A Fast Amplitude Approximation For Quadrature Pairs

Bell System Technical Journal, 1971
This paper gives an algorithm from which an approximation to the amplitude of a quadrature pair can be obtained simply and without requiring more bits than are needed to represent the largest allowable amplitude, A. If A cos θ and A sin θ are a quadrature pair, the amplitude is $A=(A^{2}\cos^{2}\theta + A^{2}\sin^{2}\theta)^{1\over 2}.$ If AX is the ...
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Pair approximation for interface kinetics

Journal of Crystal Growth, 1974
Abstract A pair approximation method is described for the interface kinetics of a simple cubic (100) surface with no surface migration. Condensation and evaporation are considered explicitly in a system of master equations applied to a pair of sites; and the effect of the neighboring sites is treated with a set of parameters which are determined self-
G.H. Gilmer, H.J. Leamy, K.A. Jackson, H. Reiss   +3 more
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Pair approximation method for spin-1 Heisenberg system

Journal of Magnetism and Magnetic Materials, 2016
Spin-1 Heisenberg system on simple cubic lattice is considered in the pair approximation method assuming that the second-nearest-neighbor exchange interaction parameter has a negative value.
Mert, Gulistan, Kilic, Ahmet, Mert, Murat   +2 more
exaly   +2 more sources

On characterizations of a pair of covering-based approximation operators

Soft Computing, 2018
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Yan-Lan Zhang, Changqing Li, Jinjin Li 0001   +2 more
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Binding mean spherical approximation for pairing ions: An exponential approximation and thermodynamics

The Journal of Chemical Physics, 1996
The thermodynamics of mean spherical approximation for an arbitrary mixture of charged hard spheres with sticky-point attraction in the Wertheim formalism is derived for the most general case. It is shown that the electrostatic excess thermodynamics can be still computed from relatively simple formulas which depend on the screening parameter ΓB.
Bernard, Olivier, Blum, Lesser
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