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21.
22.
Andreina Ricci Simona Piccolella Federico Pepi Stefania Garzoli Pierluigi Giacomello 《Journal of the American Society for Mass Spectrometry》2013,24(7):1082-1089
The mechanism of reactions occurring in solution can be investigated also in the gas phase by suited mass spectrometric techniques, which allow to highlight fundamental mechanistic features independent of the influence of the medium and to clarifying controversial hypotheses proposed in solution studies. In this work, we report a gas-phase study performed by electrospray triple stage quadrupole mass spectrometry (ESI-TSQ/MS) on the dehydration of d-xylose, leading mainly to the formation of 2-furaldehyde (2-FA). It is generally known in carbohydrate chemistry that the thermal acid catalyzed dehydration of pentoses leads to the formation of 2-FA, but several aspects on the solution-phase mechanism are controversial. Here, gaseous reactant ions corresponding to protonated xylose molecules obtained from ESI of a solution containing d-xylose and ammonium acetate as protonating reagent were allowed to undergo collisionally activated decomposition (CAD) into the triple stage quadrupole analyzer. The product ion mass spectra of protonated xylose are characterized by the presence of ionic intermediates arising from xylose dehydration, which were structurally characterized by their fragmentation patterns. As expected, the xylose triple dehydration leads to the formation of the ion at m/z 97, corresponding to protonated 2-FA. On the basis of mass spectrometric evidences, we demonstrated that in the gas phase, the formation of 2-FA involves protonation at the OH group bound to the C1 atom of the sugar, the first ionic intermediate being characterized by a cyclic structure. Finally, energy resolved product ion mass spectra allowed to obtain information on the energetic features of the d-xylose→2-FA conversion. Figure
? 相似文献
23.
The Allen–Cahn equation, coupled with dynamic boundary conditions, has recently received a good deal of attention. The new issue of this paper is the setting of a rather general mass constraint, which may involve either the solution inside the domain or its trace on the boundary. The system of nonlinear partial differential equations can be formulated as a variational inequality. The presence of the constraint in the evolution process leads to additional terms in the equation and the boundary condition containing a suitable Lagrange multiplier. A well‐posedness result is proved for the related initial value problem. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
24.
Dr. Andrea Previtali Dr. Wei He Dr. Alessandra Forni Dr. Daniele Malpicci Dr. Elena Lucenti Dr. Daniele Marinotto Prof. Lucia Carlucci Prof. Pierluigi Mercandelli Dr. Marco Aldo Ortenzi Prof. Giancarlo Terraneo Dr. Chiara Botta Prof. Ryan Tsz Kin Kwok Dr. Jacky Wing Yip Lam Prof. Ben Zhong Tang Prof. Elena Cariati 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(67):16690-16700
Organic materials with multiple emissions tunable by external stimuli represent a great challenge. TTPyr, crystallizing in different polymorphs, shows a very rich photophyisics comprising excitation-dependent fluorescence and phosphorescence at ambient conditions, and mechanochromic and thermochromic behavior. Transformation among the different species has been followed by thermal and X-ray diffraction analyses and the emissive features interpreted through structural results and DFT/TDDFT calculations. Particularly intriguing is the polymorph TTPyr(HT), serendipitously obtained at high temperature but stable also at room temperature, whose non-centrosymmetric structure guarantees an SHG efficiency 10 times higher than that of standard urea. Its crystal packing, where only the TT units are strongly rigidified by π-π stacking interactions while the Pyr moieties possess partial conformational freedom, is responsible for the observed dual fluorescence. The potentialities of TTPyr for bioimaging have been successfully established. 相似文献
25.
P. S. Ramanujam Christian Holme Sren Hvilsted Marianne Pedersen Fulvio Andruzzi Massimo Paci Eliana L. Tassi Pierluigi Magagnini Uwe Hoffman Ingo Zebger Heinz W. Siesler 《先进技术聚合物》1996,7(9):768-776
Azobenzene side-chain liquid crystalline polyester structures suitable for permanent optical storage are described. The synthesis and characterization of the polyesters together with differential scanning calorimetry and X-ray investigations are discussed. Optical anisotropic investigations and holographic storage in one particular polyester are described in detail and polarized Fourier transform infrared spectroscopic data complementing the optical data are presented. Optical and atomic force microscope investigations point to a laser-induced aggregation as responsible for permanent optical storage. 相似文献
26.
Marco Angelucci Pierluigi Gargiani Carlo Mariani Maria Grazia Betti 《Journal of nanoparticle research》2011,13(11):5967-5973
Iron-Phthalocyanine molecules deposited on the Cu(119) vicinal surface form molecular chains along the vicinal surface steps,
as deduced by the low-energy electron diffraction (LEED) reconstruction pattern. The work-function lowers at the FePc single-layer
completion, due to the formation of an interface dipole. Further FePc deposition induces a different growth morphology, as
suggested by the slope discontinuity in the work function variation. Upon depositing potassium onto the FePc thin-film prepared
on Cu(119), the K-injected electrons fill up the Fe-d-associated and ligand-π-related orbitals, as observed by means of high-resolution
ultraviolet photoelectron spectroscopy. 相似文献
27.
Pierluigi Perrone Silvello Betti Giuseppe Giulio Rutigliano 《Fiber and Integrated Optics》2017,36(4-5):181-195
This article proposes a novel coherent multilevel modulation model that exploits polarization and phase of the field. This model is based on the possibility of coherent systems to use all the four degrees of freedom of the electromagnetic field. The proposed scheme is able, by applying a suitable twisting process to the optical fiber, to physically confine the polarization and the phase of the transmitted field within the phase sphere. In this way, with the same performances of existing systems, the receiver is considerably simplified because there is no longer need of birefringence tracking circuits. 相似文献
28.
Pierluigi Cesana 《Archive for Rational Mechanics and Analysis》2010,197(3):903-923
The relaxation of a free-energy functional which describes the order–strain interaction in nematic elastomers is obtained
explicitly. We work in the regime of small strains (linearized kinematics). Adopting the uniaxial order tensor theory (Frank
model) to describe the liquid crystal order, we prove that the minima of the relaxed functional exhibit an effective biaxial
nematic texture, as in the de Gennes order tensor model. In particular, this implies that, at a sufficiently macroscopic scale,
the response of the material is soft even if the order of the system is assumed to be fixed at the microscopic scale. The
relaxed energy density satisfies a solenoidal quasiconvexification formula. 相似文献
29.
Pierluigi?Contucci Cristian?Giardinà Claudio?GibertiEmail author Giorgio?Parisi Cecilia?Vernia 《Journal of statistical physics》2011,143(1):1-10
We numerically investigate the spin glass energy interface problem in three dimensions. We analyze the energy cost of changing
the overlap from −1 to +1 at one boundary of two coupled systems (in the other boundary the overlap is kept fixed to +1).
We implement a parallel tempering algorithm that simulates finite temperature systems and works with both cubic lattices and
parallelepiped with fixed aspect ratio. We find results consistent with a lower critical dimension D
c
=2.5. The results show a good agreement with the mean field theory predictions. 相似文献