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681.
The dispersion interactions of the chlorine atom ground state with atomic hydrogen and itself are computed with a matrix element tabulation derived from the box-based B-spline configuration-interaction method. The matrix element list was also used to calculate the quadrupole and octupole polarisabilities of the chlorine ground state. 相似文献
682.
Dispersion coefficients involving the 5s 2 1 S e and 5s5p 1,3P o states of strontium are determined from a large basis configuration interaction calculation. Dispersion coefficients are presented for the strontium dimer and also for strontium interactions with hydrogen and the rare gases. Polarizabilities and oscillator strengths from some low lying states are also given. The ground state polarizability and that of the 5s5p 1P o and 5s4d 1D e states are very similar in size. 相似文献
683.
TAKASHI TACHIKAWA YASUHIRO KOBORI KIMIO AKIYAMA AKIO KATSUKI YOSHIHARU USUI ULRICH E. STEINER 《Molecular physics》2013,111(9):1413-1420
The spin dynamics of the duroquinone anion radical (DQ?-) generated by photoinduced electron transfer reactions from triplet eosin Y (3EY2-) to DQ have been studied by using transient absorption and pulsed EPR spectroscopy. Unusual net-absorptive electron spin polarization plus net-emissive polarization were observed, suggesting the production of the triplet exciplex or contact radical pair as the reaction intermediate. The kinetic parameters and intrinsic enhancement factors of the electron spin polarization were determined in various alcoholic solvents. The net-absorptive electron spin polarization was also observed in ethanol-water mixed solvents. The solvent effects on the radical yield are analysed on the basis of a stochastic Liouville equation established for the magnetic field effects on the radical yield. The zero-field splitting constants of the triplet exciplex are estimated from the solvent viscosity dependence of the enhancement factors due to spin-orbit coupling induced depopulation of the reaction intermediate. 相似文献
684.
The interaction between aromatic rings is a fundamental problem in material science and biochemistry. These interactions are generally found to stabilise protein molecules and the double helical structure of DNA, and they also play an important role in the recognition processes in biological and non-biological systems. However, the complexity and variety in the structures and components of aromatic compounds are major obstacles to investigating their interactions. In this study, the simplest case of aromatic interactions, which is the interaction between two benzene rings, is modelled using a continuous approximation. Assuming a constant atomic surface density and modelling the structure of a benzene molecule as a combination of two rings, namely an inner carbon ring and an outer hydrogen ring, the van der Waals interaction between any two benzene rings can be obtained as the sum of four interactions. The major result obtained here is an analytical expression for the potential energy which can then be used to predict equilibrium configurations for two interacting benzene molecules. Moreover, we find that at sufficiently large distances between the two benzene molecules, the orientational angle φ at which the interaction energy is a minimum can be approximated by the arctan of the ratio of two separation distances in two mutually perpendicular directions. 相似文献
685.
采用基于密度泛函理论的第一性原理方法研究了丙烷硫醇 (C3H7SH)在Au(111)面五种覆盖度(1/16, 2/16, 3/16, 4/16, 1/3) 下的未解离和解离吸附的结构、能量和吸附性质. 发现丙烷硫醇的倾斜角和吸附能均受覆盖度影响, 计算结果显示丙烷硫醇的倾斜角随着覆盖度的增大减小了6°–10°, 吸附能随覆盖度的增大减小了0.21 eV. 特别针对饱和覆盖度, 研究了三种可能的表面结构: (2√3×2√3 ight)R30°, 2√3×3和(3×3). 发现S–H键未解离时三种表面结构的吸附构型和吸附能基本一致; S–H键解离后, (2√3×2√3 ight)R30°和2√3×3结构的吸附能比以(3×3)结构的吸附能约高0.05–0.07 eV, 说明C3H7S在Au(111)面吸附时, 倾向于形成(2√3×2√3 ight)R30°和2√3×3结构. 此外, 采用DFT-D2方法对饱和覆盖度下C3H7SH分子在Au(111)面的吸附进行了范德华修正, 结果显示分子间相互作用使吸附物和Au表面的距离减小, 该相互作用对吸附能的修正值为0.53 eV, 修正后结果与实验结果接近.
关键词:
第一性原理
覆盖度
表面结构
范德华力 相似文献
686.
A facile synthesis of fused imidazo azepine derivatives by a van Leusen/intramolecular enyne metathesis synthetic sequence is reported. The two-step reaction sequence generates compounds of significant molecular complexity from simple starting materials in an expedient fashion with good overall yields. 相似文献
687.
A. Napoli A. Messina T. Cusati G. Draganescu 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,50(3):419-423
The quantum covariances of physically transparent pairs
of observables relative to two dimers hosted in a solid matrix are
exactly investigated in the temporal domain. Both dimers possess
fermionic and bosonic degrees of freedom and are dipolarly
coupled. We find out and describe clear signatures traceable back
to the presence and persistence of quantum coherence in the time
evolution of the system. Manifestations of a competition between
intramolecular and intermolecular energy migration mechanisms are
brought to light. The experimental relevance of our results is
briefly commented. 相似文献
688.
689.
We report on a study exploring the possibilities of silicon etched, flat-rectangular nano-channels for the acceleration of liquid chromatography separations. Using the shear-forces originating from a moving channel part to propagate the mobile phase flow, a mixture of two neutral coumarin dyes could be separated in less than 50 ms and with a resolution of over N=106 plates/m. The obtained experimental van Deemter-plot show a good agreement with the theoretical expectations and has a minimal plate height around H=1.0 μm (k=1.5) and H=0.6 μm (k=0.5). The different steps in the fabrication of the nano-channels, and the advantages of a novel detection scheme, based on fluorescent charge-coupled device-array imaging under stopped-flow conditions, are discussed as well. 相似文献
690.
M. Albertí A. Castro A. Laganà M. Moix F. Pirani D. Cappelletti 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(1):185-191
The dynamics of heteroclusters containing argon, benzene and chlorine has
been investigated using a recently proposed potential energy functional that
takes into account both the electrostatic and the non-electrostatic
contributions to the overall noncovalent interaction. Related steric and
energetic properties are compared with those homologous cationic clusters. 相似文献