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61.
Saeid Abbasbandy Elyas Shivanian Khalid Hammood AL‐Jizani 《Numerical Methods for Partial Differential Equations》2021,37(1):462-478
In this study, we develop an approximate formulation for two‐dimensional nonlinear Sobolev problems by focusing on pseudospectral meshless radial point interpolation (PSMRPI) which is a kind of locally applied radial basis function interpolation and truthfully a meshless approach. In the PSMRPI method, the nodal points do not need to be regularly distributed and can even be quite arbitrary. It is easy to have high order derivatives of unknowns in terms of the values at nodal points by constructing operational matrices. The convergence and stability of the technique in some sense are studied via some examples to show the validity and trustworthiness of the PSMRPI technique. 相似文献
62.
Pikul AP Stockert U Steppke A Cichorek T Hartmann S Caroca-Canales N Oeschler N Brando M Geibel C Steglich F 《Physical review letters》2012,108(6):066405
Thermodynamic and transport properties of the La-diluted Kondo lattice CeNi(2)Ge(2) were studied in a wide temperature range. The Ce-rich alloys Ce(1-x)La(x)Ni(2)Ge(2) were found to exhibit distinct features of the coherent heavy Fermi liquid. At intermediate compositions (0.7≤x≤0.9), non-Fermi liquid properties have been observed, followed by the local Fermi liquid behavior in the dilute limit. The 4f-electron contribution to the specific heat was found to follow the predictions of the Kondo-impurity model in both the local as well as the coherent regimes, with the characteristic Kondo temperature decreasing rapidly from about 30 K for the parent compound CeNi(2)Ge(2) to about 1 K in the most dilute samples. The specific heat does not show any evidence for the emergence of a new characteristic energy scale related to the formation of the coherent Kondo lattice. 相似文献
63.
H. von Löhneysen A. Neubert T. Pietrus A. Schröder O. Stockert U. Tutsch M. Loewenhaupt A. Rosch P. Wölfle 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,5(3):447-455
We report on extensive elastic neutron scattering to determine the wave vector of the magnetic order in CeCu6-xAux single crystals for x
> 0.1. For all values of x investigated (0.2, 0.3, 0.5, 1.0) we find long-range incommensurate antiferromagnetic order with an ordering vector (0.625
0.275) for x
=0.2, nearly unchanged for x
=0.3, and (0.59) for x
=0.5, staying roughly the same for x
=1.0. In addition, short-range correlations are observed for x
=0.2, reminiscent of those found previously for x
=0.1. The ordered magnetic moment is found to increase rapidly for small x, and more slowly for the larger x values. The increase of the specific-heat anomaly at the ordering temperature with x is in qualitative accord with this behavior. Finally, data of the electrical resistivity for current flow along the three
crystallographic directions are presented, showing a clear signature of the magnetic order. A theoretical interpretation of
the interplay of magnetic order and transport in terms of (i) the partial suppression of the Kondo effect by the staggered
magnetization and (ii) the anisotropic band structure induced by the staggered field is shown to account well for the data,
provided the ordering vector is close to 2
k
F, where k
F is a typical Fermi momentum.
Received: 20 February 1998 / Accepted: 17 April 1998 相似文献
64.
Doonan CJ Stockert A Hille R George GN 《Journal of the American Chemical Society》2005,127(12):4518-4522
In this paper we report the results of molybdenum K-edge X-ray absorption studies performed on the oxidized active site of xanthine oxidase at pH 6 and 10. These results indicate that the active site possesses one terminal oxygen ligand (Mo=O), two thiolate ligands (Mo-S), one terminal sulfido ligand (Mo=S), and one Mo-OH moiety. EXAFS analysis demonstrates that the Mo-OH bond shortens from 1.97 A at pH 6 to 1.75 A at pH 10, which is consistent with the generation of a Mo-O- moiety. This study provides convincing structural evidence that the catalytic oxygen donor at the oxidized active site of xanthine oxidase is Mo-OH rather than the Mo-OH2 ligation previously suggested by X-ray crystallography. These results support a mechanism initiated by base-assisted nucleophilic attack of the substrate by Mo-OH. 相似文献
65.
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68.
Ohne Zusammenfassung 相似文献
69.
70.
Willem de Haan Yolande AL Pijnenburg Rob LM Strijers Yolande van der Made Wiesje M van der Flier Philip Scheltens Cornelis J Stam 《BMC neuroscience》2009,10(1):101-12