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121.
Simon Labrunie Sandrine Marchal Jean‐Rodolphe Roche 《Mathematical Methods in the Applied Sciences》2010,33(17):2132-2142
We propose a result of local existence and uniqueness of a mild solution to the one‐dimensional Vlasov–Poisson system. We establish the result for an initial condition lying in the space W1,1(?2), then we extend it to initial conditions lying in the space BV(?2), without any assumption of continuity, boundedness or compact support. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
122.
Photooxidation of polypropylene/layered double hydroxide nanocomposites: Influence of intralamellar cations 总被引:1,自引:0,他引:1
Sunil P. Lonkar Sandrine Therias Nathalie Caperaa Fabrice Leroux Jean-Luc Gardette 《European Polymer Journal》2010,46(7):1456-135
The influence of layered double hydroxides (LDHs) on the photooxidation of polypropylene (PP)/LDH nanocomposites was studied under irradiation at long wavelengths (λ > 300 nm, 60 °C and in the presence of oxygen). The influence of hybrid LDHs containing different divalent cations (Mg, Zn or both Mg and Zn) on the photooxidation mechanism of PP and on the rates of oxidation of the matrix was characterised based on infrared analysis. The presence of LDHs modifies the photoproducts accumulating in the PP and the rates of oxidation of PP were changed depending on the divalent cations in the LDH layers. Whereas natural clays, such as montmorillonite (MMt), can lead to a faster degradation of the materials, LDHs (Zn2-Al-DS, for example) appear to have no inductive effect on polymer oxidation. 相似文献
123.
124.
Michalak DJ Rivillon S Chabal YJ Estève A Lewis NS 《The journal of physical chemistry. B》2006,110(41):20426-20434
Fourier transform infrared spectroscopy and first principles calculations have been used to investigate the reaction of atomically smooth, hydrogen-terminated Si(111) (H-Si) surfaces with anhydrous liquid methanol. After 10 min of reaction at room temperature, a sharp absorbance feature was apparent at approximately 1080 cm(-1) that was polarized normal to the surface plane. Previous reports have identified this mode as a Si-O-C stretch; however, the first principles calculations, presented in this work, indicate that this mode is a combination of an O-C stretch with a CH3 rock. At longer reaction times, the intensity of the Si-H stretching mode decreased, while peaks attributable to the O-C coupled stretch and the CH3 stretching modes, respectively, increased in intensity. Spectra of H-Si(111) surfaces that had reacted with CD3OD showed the appearance of Si-D signals polarized normal to the surface as well as the appearance of vibrations indicative of Si-OCD3 surface species. The data are consistent with two surface reactions occurring in parallel, involving (a) chemical attack of hydrogen-terminated Si(111) terraces by CH3OH, forming Si-OCH3 moieties having their Si-O bond oriented normal to the Si(111) surface and (b) transfer of the acidic hydrogen of the methanol to the silicon surface, either through a direct H-to-D exchange mechanism or through a mechanism involving chemical step-flow etching of Si-H step sites. 相似文献
125.
Webb LJ Rivillon S Michalak DJ Chabal YJ Lewis NS 《The journal of physical chemistry. B》2006,110(14):7349-7356
Transmission infrared spectroscopy (TIRS) has been used to investigate the surface-bound species formed in the two-step chlorination/alkylation reaction of crystalline (111)-oriented Si surfaces. Spectra were obtained after hydrogen termination, chlorine termination, and reaction of the Cl-Si(111) surface with CH(3)MgX or C(2)H(5)MgX (X = Cl, Br) to form methyl (CH(3))- or ethyl (C(2)H(5))-terminated Si(111) surfaces, respectively. Freshly etched H-terminated Si(111) surfaces that were subsequently chlorinated by immersion in a saturated solution of PCl(5) in chlorobenzene were characterized by complete loss of the Si-H stretching and bending modes at 2083 and 627 cm(-1)(,) respectively, and the appearance of Si-Cl modes at 583 and 528 cm(-1). TIRS of the CH(3)-terminated Si(111) surface exhibited a peak at 1257 cm(-1) polarized perpendicular to the surface assigned to the C-H symmetrical bending, or "umbrella" motion, of the methyl group. A peak observed at 757 cm(-1) polarized parallel to the surface was assigned to the C-H rocking motion. Alkyl C-H stretch modes on both the CH(3)- and C(2)H(5)-terminated surfaces were observed near 2900 cm(-1). The C(2)H(5)-terminated Si(111) surface additionally exhibited broad bands at 2068 and 2080 cm(-1), respectively, polarized perpendicular to the surface, as well as peaks at 620 and 627 cm(-1), respectively, polarized parallel to the surface. These modes were assigned to the Si-H stretching and bending motions, respectively, resulting from H-termination of surface atoms that did not form Si-C bonds during the ethylation reaction. 相似文献
126.
A simple model based on Gaussian statistics, aimed at describing localized diffusive translational motion in one, two, and three dimensions is presented and used to calculate the corresponding incoherent neutron scattering laws. In the time domain, these laws are closed form mathematical functions. In the frequency domain, some of these laws can be expressed as an infinite series depending on one single index. Owing to this relative simplicity, such a model can advantageously replace previous models such as diffusion on a segment, inside a circle and inside a sphere with an impermeable surface, to analyze neutron quasielastic scattering data associated with molecular motions in confined media. It may also be more realistic when the confinement is defined by soft, ill-defined boundaries. 相似文献
127.
Pascal Miéville Puneet Ahuja Dr. Riddhiman Sarkar Dr. Sami Jannin Dr. Paul R. Vasos Dr. Sandrine Gerber‐Lemaire Dr. Mor Mishkovsky Dr. Arnaud Comment Prof. Rolf Gruetter Dr. Olivier Ouari Prof. Paul Tordo Prof. Geoffrey Bodenhausen 《Angewandte Chemie (International ed. in English)》2010,49(43):7834-7834
128.
129.
Sandrine Guillou 《Tetrahedron》2010,66(14):2654-7034
In the course of a research program focused on the preparation of libraries of new chemical entities derived from 3-alkoxypyrazoles, we studied their N-pyridylation using 2, 3 or 4-bromopyridines. This was achieved using Cristau and Taillefer copper-catalyzed arylation method and mostly led to the 3-alkoxy-1H-pyrazol-1-yl pyridine isomer along with lesser amount of the alternative 5-alkoxy-1H-pyrazol-1-yl pyridine. The structures of these isomers were often established via their chemical transformations and sometimes recourse to unambiguous synthetic routes for comparison purposes. The alternative use of 2-fluoropyridine-based arylation was also investigated and lifted some of the limitations encountered in the course of this study. 相似文献
130.
Photoageing behaviour of epoxy nanocomposites: Comparison between spherical and lamellar nanofillers
Benedicte Mailhot Sandrine Morlat-Thérias Loic Le Pluart Henry Sautereau Jean-Luc Gardette 《Polymer Degradation and Stability》2008,93(10):1786-1792
The photochemical behaviour of a nanofilled epoxy resin has been studied. It has been shown that the filler content increases at the surface with irradiation time. Qualitative stiffness and adhesion measurements compare the surface properties of the filled and unfilled samples upon ageing. Depth profiling has been achieved by AFM nanoindentation and micro-FTIR. These two techniques allowed comparing stiffness and photooxidation of the aged samples. Both techniques showed an influence of nanofillers on thickness profiles. The relationship between the oxidation process and its consequences on the physical properties is explained taking into account oxygen permeability and light diffusion. Additionally, it has been shown that, whatever the content (5-10 wt%), the nature (silica or different organo-modified montmorillonites) or the shape of the filler (spherical or lamellar), the photoproducts were formed in comparable proportions and at similar rates as in the pristine matrix. 相似文献