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1.
This work studies the partitioning of the electron density into two contributions which are interpreted as the paired and the effectively unpaired electron densities. The topological features of each density field as well as of the total density are described localizing the corresponding critical points in simple selected molecules (local formalism). The results show that unpaired electron-density concentrations occur out of the topological bonding regions whereas the paired electron densities present accumulations inside those regions. A comparison of these results with those arising from population analysis techniques (nonlocal or integrated formalisms) is reported. 相似文献
2.
This work carries out a study of atomic valences within molecular systems based on Mulliken and topological population analyses at correlated level. The use of the unpaired electron densities leads to suitable relationships between valences, free valence indices, and bond indices, which turn out to be quite useful for computational purposes. The results arising from both methods at correlated and uncorrelated levels are compared in a large series of chemical compounds. Several interesting conclusions are drawn out and analyzed in detail. 相似文献
3.
4.
Ivana Bochicchio 《Ricerche di matematica》2011,60(2):179-192
The existence and physical uniqueness is proved for the restricted evolution problem in general relativity. Precisely, the
Einstein equations for the gravitational field are analyzed in harmonic and generic adapted coordinates in order to prove
the existence and uniqueness of solution in both systems of coordinates. 相似文献
5.
We consider the definition of topological susceptibility suggested by the anomaloys UA(1) Ward identify in lattice QCD with Wilson fermions and show that, in the limit of zero renormalized quark mass, its perturbative expansion is zero to all orders. This definition is thus suitable for Monte Carlo simulations. 相似文献
6.
Marco Bochicchio Luciano Maiani Guido Martinelli Giancarlo Rossi Massimo Testa 《Nuclear Physics B》1985,262(2):331-355
The chiral properties of the continuum limit of lattice QCD with Wilson fermions are studied. We show that a partially conserved axial current can be defined, satisfying the usual current algebra requirements.A proper definition of the chiral symmetry order parameter, , is given, and the chiral properties of composite operators are investigated. The implications of our analysis to the lattice determination of non-leptonic weak amplitudes are also discussed. 相似文献
7.
Dandurand Jany Samouillan Valérie Lacabanne Colette Pepe Antonietta Bochicchio Brigida 《Journal of Thermal Analysis and Calorimetry》2018,131(2):1323-1332
Journal of Thermal Analysis and Calorimetry - Elastin fibrillogenesis is conditioned by multiple self-assembly processes. Previous studies have evidenced the crucial influence of amino acid... 相似文献
8.
Alcoba DR Bochicchio RC Lain L Torre A 《Physical chemistry chemical physics : PCCP》2008,10(33):5144-5146
This article states the concept of covalent bond order for open-shell systems from the invariance properties of the first- and second-order reduced density matrices for all the components of a multiplet state. A general bond order definition is formulated in the framework of the electronic population analyses in the Hilbert space of atomic orbitals. 相似文献
9.
This article is a continuation of our previous paper on schemes of energy decompositions of molecular systems in the real space [D. R. Alcoba et al., J. Chem. Phys. 122, 074102 (2005)] now using correlated state functions. We study, according to physical arguments, the appropriate management of the density cumulant arising from the second-order reduced density matrix at correlated level, whose contributions can be assigned to one-center or to two-center terms in the energy partitioning. Our treatments are applied within two physical space partitioning schemes: the Bader partitioning into atomic basins and the fuzzy atom procedure. The results obtained in selected molecules are analyzed and discussed in detail. 相似文献
10.
C. Valdemoro M. P. De Lara-Castells R. Bochicchio E. Prez-Romero 《International journal of quantum chemistry》1997,65(2):107-119
The properties of the spin-adapted reduced Hamiltonian (SRH) matrices and of their eigenvectors permit in many cases a projection of the two-electron matrices, which amounts to an effective truncation of the basis at the stage of the calculations which are time and as memory consuming. Besides this effective truncation of the basis, another simplification can be introduced by segregating an n-electron cloud from the N electrons of the system. Thus, the energy and the electron distribution of a smaller electronic cloud, for instance, the π or the σ cloud in aromatic systems, can be calculated; their separability being subsequently analyzed. Different relevant spaces have been examined in the study of the π-electron cloud in benzene and naphthalene. © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65 : 107–119, 1997 相似文献