全文获取类型
收费全文 | 69篇 |
免费 | 0篇 |
专业分类
化学 | 4篇 |
晶体学 | 1篇 |
力学 | 3篇 |
物理学 | 61篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 3篇 |
2006年 | 2篇 |
2004年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1969年 | 1篇 |
排序方式: 共有69条查询结果,搜索用时 15 毫秒
41.
Chen JM Lee JM Chou TL Chen SA Huang SW Jeng HT Lu KT Chen TH Liang YC Chen SW Chuang WT Sheu HS Hiraoka N Ishii H Tsuei KD Huang E Lin CM Yang TJ 《The Journal of chemical physics》2010,133(15):154510
Variations in the electronic structure and structural distortion in multiferroic DyMnO(3) were probed by synchrotron x-ray diffraction, lifetime-broadening-suppressed x-ray absorption spectroscopy (XAS), and ab initio electronic structure calculations. The refined x-ray diffraction data enabled an observation of a diminished local Jahn-Teller distortion of Mn sites within MnO(6) octahedra in DyMnO(3) on applying the hydrostatic pressure. The intensity of the white line in Mn K-edge x-ray absorption spectra of DyMnO(3) progressively increased with the increasing pressure. With the increasing hydrostatic pressure, the absorption threshold of an Mn K-edge spectra of DyMnO(3) shifted toward a greater energy, whereas the pre-edge line slightly shifted to a smaller energy. We provide the spectral evidence for the pressure-induced bandwidth broadening for manganites. The intensity enhancement of the white line in Mn K-edge spectra is attributed to a diminished Jahn-Teller distortion of MnO(6) octahedra in compressed DyMnO(3). A comparison of the pressure-dependent XAS spectra with the ab initio electronic structure calculations and full calculations of multiple scattering using the code FDMNES shows the satisfactory agreement between experimental and calculated Mn K-edge spectra. 相似文献
42.
Yamaoka H Jarrige I Tsujii N Lin JF Ikeno T Isikawa Y Nishimura K Higashinaka R Sato H Hiraoka N Ishii H Tsuei KD 《Physical review letters》2011,107(17):177203
We have investigated the temperature and pressure dependency of the electronic structure of Yb-filled skutterudites, YbFe(4)Sb(12) and Yb(0.88)Fe(4)Sb(12), using x-ray absorption and emission spectroscopies. An anomalous increase of the Yb valence, which is beyond the conventional Anderson model picture, is found to coincide with the onset of the ferromagnetic order in the x=0.88 sample below 20 K. In contrast, the nearly stoichiometric YbFe(4)Sb(12) is paramagnetic down to 2 K and the Yb valence is independent of temperature. This evidences a close interplay between the magnetic instability of the Fe 3d electrons and valence instability of the Yb 4f electrons. Under pressure, a sudden increase in the valence is found to occur around 13 GPa for YbFe(4)Sb(12) and 17 GPa for Yb(0.88)YbFe(4)Sb(12). 相似文献
43.
44.
A first-order accurate method of extending the capability of image velocimetry to interfaces is presented. In this method,
the image fields are locally extended across interfaces using fields from the other image of an image pair. During this image
parity exchange, the extension of the image fields amounts to locally reversing and reflecting the relative velocity field
across the interface. Numerous experimental examples are given to demonstrate and validate the accuracy of the method. These
are the plane Couette flow and the laminar pipe flow demonstrating straight rigid boundaries; uniform flow past a sphere and
a sphere moving in a stagnant fluid demonstrating curved rigid surfaces; and a free-surface flow and a liquid–liquid interface
flow demonstrating compliant interfaces.
Received: 3 November 1998/Accepted: 18 August 1999 相似文献
45.
C.C. Tsuei T. Doderer 《The European Physical Journal B - Condensed Matter and Complex Systems》1999,10(2):257-262
The fact that the stripe phase and pseudogap in the cuprate superconductors occur in the same doping regime is emphasized.
A model based on charge confinement in self-organized nanometer-scale stripe fragments is proposed to understand various generic
features of the normal-state energy gap including the magnitude of the gap, its anti-correlation with the superconducting
gap, and the d-wave symmetry in its -dependence. This model also provides a basis for understanding other anomalous normal-state properties such as the linear
temperature dependence of electrical resistivity.
Received 7 December 1998 相似文献
46.
Using standard ac calorimetry, we have measured the specific heat of the amorphous ferromagnet Fe75P15C10 in the neighborhood of its Curie temperature TC ? 600 K. Even though this material is structurally disordered, a sharp lambda-like cusp was observed, typical of a pure crystalline substance. We report the first determination of the critical specific heat exponent α = δ′ = -.18 ± .04 and the amplitude ratio A+/A- = 1.2 ± .3 for an amorphous ferromagnet and find that these values are typical of a Heisenberg system. Our results are in agreement with recent renormalization group calculations which indicate that the fixed point which characterizes the critical behavior will be stable against the addition of disorder to the ordered system if α < 0. 相似文献
47.
Using results of tunneling measurements, values of 2Δ(o)/kTc for a number of amorphous transition-metal based superconductors are found to be 3.5±0.1 in agreement with the BCS theory in the weak-coupled limit unlike previously reported results suggesting strong electron-phonon coupling in amorphous non-transition metals such as Ga and Pb-Bi alloys. A comparison of our results with existing data for amorphous soft-metal alloys and A-15 compounds suggests that non-crystallinity alone does not give rise to a significantly enhanced electron-phonon interaction. 相似文献
48.
N. Hiraoka H. Okamura H. Ishii I. Jarrige K. D. Tsuei Y. Q. Cai 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,70(2):157-162
Electronic excitations in transition-metal oxides MnO, FeO, CoO and NiO are investigated by inelastic X-ray scattering and
optical reflectivity measurements. The dielectric functions are derived from the experimental data as a function of the momentum
transfer, q. Based on the derived q-dependent dielectric functions, two types of the charge transfer excitations, i.e., dipolar
and non-dipolar charge transfer, are clearly identified. We show that the Mott gaps around 5 eV are defined by the former
whereas the latter occurs at higher energies of 8–12 eV. Based on a molecular orbital analysis, we associate the dipolar and
the non-dipolar excitations with non-local charge transfer and conventional charge transfer, respectively. These types of
excitations are shown to be common for the 3d metal monoxides. On the other hand, the dd excitations observed in NiO and CoO
at energy <4 eV do not appear in FeO and MnO. The reasons are addressed in this report. 相似文献
49.
B.A. Scott E.Y. Suard C.C. Tsuei D.B. Mitzi T.R. McGuire B.-H. Chen D. Walker 《Physica C: Superconductivity and its Applications》1994,230(3-4)
High-pressure methods have been used to synthesize multiphase compositions in the Hg---12{n−1}n homologous series. The phase assemblages were examined by optical, electron diffraction and X-ray diffraction techniques, and their stoichiometries verified by electron microprobe. Transport and magnetic susceptibility measurements were combined with the results of the phase analysis to establish superconducting transition temperatures for both as-prepared and O2- or Ar-annealed materials. It was found that the transition temperature peaks at Tc = 134 K for n = 3 and then decreases abruptly for n>4, reaching Tc<90 K for n7. 相似文献
50.
Tang SJ Lee CY Huang CC Chang TR Cheng CM Tsuei KD Jeng HT Yeh V Chiang TC 《Physical review letters》2011,107(6):066802
Lattice match is important for epitaxial growth. We show that a competing mechanism, electronic match, can dominate at small film thicknesses for metal-semiconductor systems, where quantum confinement and symmetry requirements may favor a different growth pattern. For Pb(111) on Ge(111), an accidental lattice match leads to a √3 × √3 configuration involving a 30° in-plane rotation at large film thicknesses, but it gives way to an incommensurate (1 × 1) configuration at small film thickness. The transformation follows an approximately inverse-film-thickness dependence with superimposed bilayer oscillations. 相似文献