1,721,072 research outputs found
20th RCRA International workshop on “Experimental evaluation of algorithms for solving problems with combinatorial explosion”
No full textCompte rendu : F. Ricca, E. Lo Bue, "The Great Stupa of Gyantse"
No full textCompte rendu : Arts asiatiques, tome XLIX, 1994, 138 : F. Ricca, E. Lo Bue, "The Great Stupa of Gyantse", London , Serindia publications, 1994
Compte rendu : F. Ricca, E. Lo Bue, "The Great Stupa of Gyantse"
No full textCompte rendu : Arts asiatiques, tome XLIX, 1994, 138 : F. Ricca, E. Lo Bue, "The Great Stupa of Gyantse", London , Serindia publications, 1994
Madelung Field and Electron Correlation In Physisorption
No full textThe effect of the Madelung field corresponding to formal point charges +/-e arranged according to the fcc lattice of LiF upon CO, N2 and NO molecules is studied in order to isolate the purely electrostatic interaction from the other forces acting in the related physisorption processes. The polarization which is produced in those molecules by the Madelung field is analyzed in terms of dipole and quadrupole moments, as well as in terms of electron charge distributions. The influence of the electron correlation is taken into account by using the QCISD technique, which requires the semi-infinite lattice being simulated with a suitable cluster of point charges
Regular Adsorption of Co Molecules On Lif(001)
No full textThe regular adsorption of CO at various concentrations on an infinite three-layer slab of LiF has been studied by using the CRYSTAL ab initio program. The CO molecules are adsorbed vertically above the surface cations by purely electrostatic attraction counterbalanced by the Pauli repulsion. The induced polarization has been analysed through the changes occurring in the molecular orbitals of the adsorbed species. The adsorption via the oxygen atom appears to be preferred, which contradicts IR experimental data. Such contradiction arises from the correlation error in the Hartree-Fock SCF method which is applied in the CRYSTAL program. Consideration of simple correlated clusters enables a semi-quantitative evaluation which additively corrects the above contradictory results
Abinitio Hartree-fock Investigation of the Surface-features of Lih Slabs of Different Thickness
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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