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104.
We derive a t-J model with electron-phonon coupling from the three-band model, considering modulation of both hopping and Coulomb integrals by phonons. While the modulation of the hopping integrals dominates, the modulation of the Coulomb integrals cannot be neglected. The model explains the experimentally observed anomalous softening of the half-breathing mode upon doping and a weaker softening of the breathing mode. It is shown that other phonons are not strongly influenced, and, in particular, the coupling to a buckling mode is not strong in this model. 相似文献
105.
We study the interaction of electrons with phonons in strongly correlated solids, having high-T(c) cuprates in mind. Using sum rules, we show that the apparent strength of this interaction strongly depends on the property studied. If the solid has a small fraction (doping) delta of charge carriers, the influence of the interaction on the phonon self-energy is reduced by a factor delta, while there is no corresponding reduction of the coupling seen in the electron self-energy. This supports the interpretation of recent photoemission experiments, assuming a strong coupling to phonons. 相似文献
106.
A nearly free-electron model to describe scanning tunneling spectroscopy of (111) metal surfaces with Kondo impurities is presented. Surface states are found to play an important role giving a larger contribution to the conductance of Cu(111) and Au(111) than Ag(111) surfaces. The different line shapes observed when Co is adsorbed on the different substrates are mainly determined by the position of the surface band onset relative to the Fermi energy and the decay length of the surface state into the substrate. The lateral dependence of the line shape amplitude is found to be bulklike for R|| < or approximately 3-5 A and surfacelike at larger distances, in agreement with experimental data. 相似文献
107.
O.?R?schEmail author O.?Gunnarsson 《The European Physical Journal B - Condensed Matter and Complex Systems》2005,43(1):11-18
We study (inverse) photoemission from systems
with strong coupling of doped carriers to phonons.
Using an adiabatic approximation, we develop a method for
calculating spectra. This method is particularly simple for
systems where the electron-phonon coupling can be neglected in
the initial state, e.g., the undoped t-J model. The theory
then naturally explains why the electron-phonon coupling just
leads to a broadening of spectra calculated without electron-phonon
coupling, without changing the dispersion. This is in agreement
with recent angle-resolved photoemission spectroscopy (ARPES)
on undoped cuprates, and it supports the interpretation in terms
of strong electron-phonon interaction. The theory also shows that
for systems with strong electron-phonon coupling in the initial
state, the result cannot in general be related to the spectrum
obtained without electron-phonon coupling. 相似文献
108.
109.
Curt R. Enzell Inger Wahlberg Lars-Erik Gunnarsson 《Journal of mass spectrometry : JMS》1974,9(4):372-394
Diterpene epimers differing with respect to orientation of a secondary hydroxyl group, ring fusion or configuration at an asymmetric centre carrying carbon–carbon linked substituents were studied, and certain stereostructural-spectral correlations were achieved for the first two groups. Each of the compounds examined was subjected to multiple scanning at both high and low electron voltage to allow computer assisted statistical calculation and comparison of intensity intervals at a predetermined confidence level for total ion currents and selected peaks. 相似文献
110.
New methods have been developed and applied successfully for the determination of dissolved inorganic, organic and total carbon in water samples. The new methods utilize two instrumental setups, Reagent-Free™ Ion Chromatography (RF™-IC) and inductively coupled plasma atomic emission spectrometry (ICP-AES). Dissolved inorganic carbon (DIC) was measured in untreated samples along with Cl−, F− and SO42− using RF™-IC and by in-line mixing with 0.1 M HNO3 to enhance CO2 removal in the nebulizer, followed by ICP-AES analysis. Total dissolved carbon (TDC) was measured by in-line mixing with 0.1 M NaOH following ICP-AES analysis. Dissolved organic carbon (DOC) was obtained as the difference between DIC and TDC. Only non-volatile organic carbon could be detected by the present method. The workable limits of detection obtained in the present study were 0.5 mM (RF™-IC) and 0.1 mM (ICP-AES) for dissolved inorganic and organic carbon, respectively. The power of the new methods lies in routine analysis of DIC and DOC in samples of natural waters of variable composition and salinity using analytical techniques and facilities available in most laboratories doing water sample analysis. The techniques are sensitive and precise, can be automated using gas-tight sample vials and auto-samplers, and are independent of most elemental interferences with the exception of chloride overload by saline samples when using RF™-IC. The new methods were successfully applied for analysis of DIC and DOC in selected samples of natural and synthetic waters. 相似文献