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N. Witkowski K. Gaál-Nagy F. Fuchs O. Pluchery A. Incze F. Bechstedt Y. Borensztein G. Onida R. Del Sole 《The European Physical Journal B - Condensed Matter and Complex Systems》2008,66(4):427-431
By comparison of measured and ab initio calculated surface optical
spectra we demonstrate that two main oxidation processes initially
occur after dissociation of oxygen molecules, forming in both cases
Si–O–Si entities: (i) breaking of Si dimers by incorporation of
oxygen atoms; (ii) incorporation into the silicon backbonds. The
kinetics up to half-monolayer coverage is determined, and explained
in terms of Langmuir-like adsorption mechanisms with different
probabilities. 相似文献
106.
O. Pulci M. Marsili P. Gori M. Palummo A. Cricenti F. Bechstedt R. Del Sole 《Applied Physics A: Materials Science & Processing》2006,85(4):361-369
We present an ab initio study of two semiconductor surfaces, the α phase of Sn on Ge(111) and the cleavage surface of diamond. The theoretical tools used (density functional theory (DFT) and many-body perturbation theory) are discussed in detail, and the advantages and disadvantages of the two approaches are pointed out. We show that in the case of diamond it is essential to go beyond the DFT single-particle approach, and to introduce quasiparticle effects through the GW approximation. PACS 73.20.-r; 73.20.At; 71.15.Mb 相似文献
107.
We propose an alternative formulation of many-body perturbation theory that uses the density-functional concept. Instead of the usual four-point integral equation for the polarizability, we obtain a two-point one, which leads to excellent optical absorption and energy-loss spectra. The corresponding three-point vertex function and self-energy are then simply calculated via an integration, for any level of approximation. Moreover, we show the direct impact of this formulation on the time-dependent density-functional theory. Numerical results for the band gap of bulk silicon and solid argon illustrate corrections beyond the GW approximation for the self-energy. 相似文献
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Lorenzo Bertini Alberto De Sole Davide Gabrielli Giovanni Jona‐Lasinio Claudio Landim 《纯数学与应用数学通讯》2011,64(5):649-696
Consider the viscous Burgers equation ut + f(u)x = εuxx on the interval [0,1] with the inhomogeneous Dirichlet boundary conditions u(t,0) = ρ0, u(t,1) = ρ1. The flux f is the function f(u) = u(1 − u), ε > 0 is the viscosity, and the boundary data satisfy 0 < ρ0 < ρ1 < 1. We examine the quasi‐potential corresponding to an action functional arising from nonequilibrium statistical mechanical models associated with the above equation. We provide a static variational formula for the quasi‐potential and characterize the optimal paths for the dynamical problem. In contrast with previous cases, for small enough viscosity, the variational problem defining the quasi‐potential admits more than one minimizer. This phenomenon is interpreted as a nonequilibrium phase transition and corresponds to points where the superdifferential of the quasi‐potential is not a singleton. © 2011 Wiley Periodicals, Inc. 相似文献
110.
Bussetti G Bonanni B Cirilli S Violante A Russo M Goletti C Chiaradia P Pulci O Palummo M Del Sole R Gargiani P Betti MG Mariani C Feenstra RM Meyer G Rieder KH 《Physical review letters》2011,106(6):067601
A long-standing puzzle regarding the Si(111) ? 2 × 1 surface has been solved. The surface energy gap previously determined by photoemission on heavily n-doped crystals was not compatible with a strongly bound exciton known from other considerations to exist. New low-temperature angle-resolved photoemission and scanning tunneling microscopy data, together with theory, unambiguously reveal that isomers with opposite bucklings and different energy gaps coexist on such surfaces. The subtle energetics between the isomers, dependent on doping, leads to a reconciliation of all previous results. 相似文献