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991.
Acylation of 1,3,3-trimethyl-2-methyleneindoline (Fischer's Base) gives enaminone derivatives which show unusual C-protonation and exist in solution as mixtures of the -s- and -s- configurations. 相似文献
992.
D. Aston M. Atkinson R. Bailey A.H. Ball B. Bouquet G.R. Brookes J. Br?ring P.J. Bussey D. Clarke A.B. Clegg B. DAlmagne G. De Rosny B. Diekmann A. Donnachie M. Draper B. Drevillon I.P. Duerdoth J.-P. Dufey T.P. Yiou 《Physics letters. [Part B]》1981,100(1):91-94
Evidence is presented for inclusive photoproduction of F± mesons in three decay modes, ηπ±, ηπ±π+π? and ηπ±π+π+π?π?. The average mass of the F± is found to be 2.020±0.010 GeV. 相似文献
993.
The 13C NMR spectra of 20 aminocycloalkanecarbonitriles were determined in CDCl3. The signals were assigned by a self-consistent analysis of chemical shift data and comparison with results from phencyclidine analogues. The results were interpreted in terms of changes in the amine (primary, secondary, tertiary) and the cycloakane (cyclohexane vs cyclopentane) moieties and their bulk. Changes in the conformational equilibria of the cyclohexane series are suggested by comparisons between data from the carbonitrile and phencyclidine series. The spectra are suitable for corroborative authentication of reference materials and the identification of unknowns. 相似文献
994.
995.
In many areas of applied mathematics, the govering equations can be expressed as dual equations which are elements in two vector spaces where a given functional defined on a cartesian product space has zero gradients. If this functional has a global saddle structure then the variational principle can be replaced by dual extremum principles of the Noble and Sewell type. The purpose of the present paper is to investigate how comparison functional which have convex, concave or saddle structure can be used to generate upper and lower bounding principles and critical sequences. The methods are illustrated by applications to the periodic solutions of a non-linear differential equation and the Fredholm integral equation. 相似文献
996.
Simultaneous application of integrated optics and Raman spectroscopy is used to investigate the hydrogen bonding of water in thin dense symmetric membranes of cellulose acetate (CA). A modified X-ray quarter circle goniometer is used to measure refractive index, film thickness, and Raman spectra using guided laser beams and the prism coupler technique. The film remains in a fixed position during all measurements thereby ensuring identical light collection geometries for Raman scattering observed from different wave-guiding modes. To illustrate the technique, Raman scattering of a 3.5 μm film of CA398-10 in the OH stretching region is shown as a function of relative humidity (RH). These spectra show that water sorbed at less than 50% RH is weakly hydrogen-bonded but above 50% RH, sorbed water has the strongly hydrogen-bonded properties of bulk water. 相似文献
997.
The 2H-N.M.R. spectra of mixtures of the non-mesogenic compound 4-cyano-4'-methylbiphenyl (1CB) and the nematic liquid crystal 4-cyano-4'-n-pentylbiphenyl (5CB) are measured as a function of concentration and temperature. Concentrations of up to 25 mol% 1CB have no effect on the N.M.R. spectrum and therefore on the orientational order of 5CB at a given reduced temperature. The order matrix of the 1CB is calculated from the measured quadrupole couplings. The results are analysed in terms of a model for orientational order that includes two anisotropic terms: (a) interaction between the molecular quadrupole moment and the mean electric field gradient of the medium, and (b) short range repulsive interactions. An estimate of the molecular quadrupole moment tensor of 1CB is obtained from the analysis. 相似文献
998.
An improved technique for the fabrication of uniform output couplers for far-infrared lasers has been developed. The technique includes a process for uniformly removing material from the back side of the coupler's substrate to tune the coupler's reflectivity precisely to the specified value for a particular laser line. Depending on the condition of the coupler after use, it can be retuned to another laser line, which lies within the coupler's reflectance envelope. Furthermore, when there is the possibility of lasing at two different laser wavelengths (as happens with some far-infrared lasers), it is possible to optimize the coupler for one wavelength while at the same time detuning the other wavelength. The fabrication and optimization of these devices are discussed. 相似文献
999.
Fujiwara MC Adamczak A Bailey JM Beer GA Beveridge JL Faifman MP Huber TM Kammel P Kim SK Knowles PE Kunselman AR Maier M Markushin VE Marshall GM Martoff CJ Mason GR Mulhauser F Olin A Petitjean C Porcelli TA Wozniak J Zmeskal J 《Physical review letters》2000,85(8):1642-1645
Resonant formation of d&mgr;t molecules in collisions of muonic tritium ( &mgr;t) on D2 was investigated using a beam of &mgr;t atoms, demonstrating a new direct approach in muon catalyzed fusion studies. Strong epithermal resonances in d&mgr;t formation were directly revealed for the first time. From the time-of-flight analysis of 2036+/-116 dt fusion events, a formation rate consistent with 0.73+/-(0.16)(meas)+/-(0.09)(model) times the theoretical prediction was obtained. For the largest peak at a resonance energy of 0.423+/-0.037 eV, this corresponds to a rate of (7.1+/-1.8)x10(9) s(-1), more than an order of magnitude larger than those at low energies. 相似文献
1000.
E. Rimmer Gordon Rosa Bailey Walsh William T. Pennington T. W. Hanks 《Journal of chemical crystallography》2003,33(5-6):385-390
Polyiodide salts of acridine orange were isolated from solutions of an acridine and I2 in methylene chloride, ethanol, and acetone. The products from all solutions were found to contain both amorphous and crystalline material. The isolated crystalline product from methylene chloride and ethanol were identical (1), but the product isolated from acetone was different (2). Complex 1 was formulated as [C17H19
N
3(H)]2(I)2 3I2. It crystallizes in the monoclinic space group P21/n, with a = 9.082(2) Å, b = 24.027(4) Å, c = 10.683(1) Å, = 107.20(1), and D
(calc) = 2.31 Mg/m3. Complex 2 was formulated as [C17H19
N
3(H)]I3. It crystallizes in the triclinic space group P – 1, with a = 10.498(2) Å, b = 11.265(2) Å, c = 9.287(1) Å, g 100.88(1), = 94.57(1), = 102.10(1), and D
(calc) = 2.05 Mg/m3. 相似文献