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81.
Doping effect on the carrier scattering in iron-pnictide superconductors studied by charge transport
Shigeyuki Ishida Masamichi Nakajima Motoyuki Ishikado Yasuhide Tomioka Toshimitsu Ito Kiichi Miyazawa Chul-Ho Lee Hijiri Kito Shin-ichi Shamoto Akira Iyo Hiroshi Eisaki Kenji M. Kojima Teruhisa Kakeshita Shin-ichi Uchida 《Journal of Physics and Chemistry of Solids》2011,72(5):407-409
In order to reveal the role of “carrier doping” in the iron-based superconductors, we investigated the transport properties of the oxygen-deficient iron-arsenides LnFeAsO1−y (Ln=La, Ce, Pr and Nd) over a wide doping range. We found that the effect of “doping” in this system is mainly on the carrier scattering rather than carrier density, quite distinct from that in high-Tc cuprates. In the case of La system with lower Tc, the low temperature resistivity is dominated by T2 term and fairly large magnetoresistance is observed. On the other hand, in the Nd system with higher Tc, carriers are subject to stronger scattering showing nearly T-linear resistivity and small magnetoresistance. Such strong scattering appears intimately correlated with high-Tc superconductivity in the iron-based system. 相似文献
82.
Teruhisa S. Komatsu Naoko Nakagawa Shin-ichi Sasa Hal Tasaki 《Journal of statistical physics》2011,142(1):127-153
Among various possible routes to extend entropy and thermodynamics to nonequilibrium steady states (NESS), we take the one
which is guided by operational thermodynamics and the Clausius relation. In our previous study, we derived the extended Clausius
relation for NESS, where the heat in the original relation is replaced by its “renormalized” counterpart called the excess
heat, and the Gibbs-Shannon expression for the entropy by a new symmetrized Gibbs-Shannon-like expression. Here we concentrate
on Markov processes describing heat conducting systems, and develop a new method for deriving thermodynamic relations. We
first present a new simpler derivation of the extended Clausius relation, and clarify its close relation with the linear response
theory. We then derive a new improved extended Clausius relation with a “nonlinear nonequilibrium” contribution which is written
as a correlation between work and heat. We argue that the “nonlinear nonequilibrium” contribution is unavoidable, and is determined
uniquely once we accept the (very natural) definition of the excess heat. Moreover it turns out that to operationally determine
the difference in the nonequilibrium entropy to the second order in the temperature difference, one may only use the previous
Clausius relation without a nonlinear term or must use the new relation, depending on the operation (i.e., the path in the
parameter space). This peculiar “twist” may be a clue to a better understanding of thermodynamics and statistical mechanics
of NESS. 相似文献
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Toshikazu Kaise Ken'Ichi Hanaoka Shoji Tagawa Teruhisa Hirayama Shozo Fukui 《应用有机金属化学》1988,2(6):539-546
Inorganic arsenic and methylated arsenic compounds in 60 specimens of marine organisms were investigated by hydride generation derivatization and cold-trap gas chromatography–mass spectrometry (GC MS). Chloroform–methanol extracts from seaweeds, shellfish, fish, crustaceans and other marine organisms were separated into water-soluble and lipid-soluble fractions. The arsenic compounds in each fraction were identified and analysed as arsine, methylarsine, dimethylarsine and trimethylarsine. Trimethylarsenic compounds were distributed mainly in the water-soluble fraction of muscle of carnivorous gastropods, crustaceans and fish. The amounts of dimethylated arsenic compounds were found to be larger than that of trimethylated arsenic in the lipid-soluble fraction of fish viscera. Dimethylated arsenic compounds were distributed in the water-soluble fraction of Phaeophyceae. 相似文献
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A hybrid pattern-recognition method is proposed. The Fraunhofer diffraction pattern of an object was obtained in a coherent optical system and then it was processed by a digital image-processing system. The shift- and rotation-invariant characteristic values of the diffraction pattern was calculated and the classification of the object was carried out by using those values. The proposed method was tested in a simple experimental system by using some components of an electromagnetic relay as the sample objects to be recognized. 相似文献
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Yoshiaki Kimura Dmitry G. Vassylyev† Atsuo Miyazawa‡ Akinori Kidera§ Masaaki Matsushima Kaoru Mitsuoka Kazuyoshi Murata Teruhisa Hirai Yoshinori Fujiyoshi 《Photochemistry and photobiology》1997,66(6):764-767
Abstract— Bacteriorhodopsin pumps protons from the cytoplasm to the outside of halobacteria, Halobacterium salinarium , by using absorbed light energy. The newly observed density map at 3 Å resolution clarified nearly the entire structure; the resolution in the direction perpendicular to the membrane surface is 3.2 Å. The new structure clearly indicates the proton transfer pathway in bacteriorhodopsin. In particular, the location of key aspartic acid and glutamic acid residues in the derived structural model suggested funneling structures with different designs for input and output of protons on the cytoplasmic and extracellular sides, respectively, of the protein. This paper describes the major differences between the model based on the new observation and the former model obtained through crystallographic refinement by Grigorieff et al . ( J. Mol. Biol 259; 393-421, 1996). 相似文献