全文获取类型
收费全文 | 587篇 |
免费 | 3篇 |
专业分类
化学 | 268篇 |
晶体学 | 4篇 |
力学 | 38篇 |
数学 | 63篇 |
物理学 | 217篇 |
出版年
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 9篇 |
2019年 | 4篇 |
2018年 | 11篇 |
2017年 | 18篇 |
2016年 | 16篇 |
2015年 | 9篇 |
2014年 | 10篇 |
2013年 | 24篇 |
2012年 | 21篇 |
2011年 | 26篇 |
2010年 | 22篇 |
2009年 | 21篇 |
2008年 | 21篇 |
2007年 | 23篇 |
2006年 | 25篇 |
2005年 | 21篇 |
2004年 | 21篇 |
2003年 | 21篇 |
2002年 | 18篇 |
2001年 | 22篇 |
2000年 | 15篇 |
1999年 | 9篇 |
1998年 | 10篇 |
1997年 | 8篇 |
1996年 | 11篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1993年 | 9篇 |
1992年 | 9篇 |
1991年 | 11篇 |
1990年 | 4篇 |
1989年 | 10篇 |
1988年 | 4篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1983年 | 4篇 |
1982年 | 9篇 |
1979年 | 8篇 |
1977年 | 6篇 |
1974年 | 6篇 |
1972年 | 4篇 |
1971年 | 3篇 |
1970年 | 8篇 |
1969年 | 8篇 |
1968年 | 8篇 |
1967年 | 3篇 |
1966年 | 3篇 |
1963年 | 5篇 |
排序方式: 共有590条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
N.T. Bagraev O.N. Guimbitskaya L.E. Klyachkin A.A. Kudryavtsev A.M. Malyarenko V.V. Romanov A.I. Ryskin I.A. Shelykh A.S. Shcheulin 《Physica C: Superconductivity and its Applications》2010,470(19):893-896
Planar CdBxF2−x–p-CdF2–CdBxF2−x sandwich nanostructures prepared on the surface of the n-type CdF2 bulk crystal are studied to register the spin transistor and quantum spin Hall-effects. The current–voltage characteristics of the ultra-shallow p+–n junctions verify the CdF2 gap, 7.8 eV, and the quantum subbands of the 2D holes in the p-type CdF2 quantum well confined by the CdBxF2−xδ-barriers. The temperature and magnetic field dependencies of the resistance, specific heat and magnetic susceptibility demonstrate the high temperature superconductor properties for the CdBxF2−xδ-barriers. The value of the superconductor energy gap, 2Δ = 102.06 meV, determined by the tunneling spectroscopy method appears to be in a good agreement with the relationship between the zero-resistance supercurrent in superconductor state and the conductance in normal state, πΔ/e, at the energies of the 2D hole subbands. The results obtained are evidence of the important role of the multiple Andreev reflections in the creation of the high spin polarization of the 2D holes in the edged channels of the sandwich device. The high spin hole polarization in the edged channels is shown to identify the mechanism of the spin transistor and quantum spin Hall-effects induced by varying the top gate voltage, which is revealed by the first observation of the Hall quantum conductance staircase. 相似文献
86.
N. T. Bagraev V. A. Mashkov E. Yu. Danilovsky W. Gehlhoff D. S. Gets L. E. Klyachkin A. A. Kudryavtsev R. V. Kuzmin A. M. Malyarenko V. V. Romanov 《Applied magnetic resonance》2010,39(1-2):113-135
We present the first findings of the new electrically and optically detected magnetic resonance technique [ED electron spin resonance (EDESR) and ODMR], which reveal single point defects in the ultra-narrow silicon quantum wells (Si-QW) confined by the superconductor δ-barriers. This technique allows the ESR identification without application of an external cavity, as well as a high frequency source and recorder, and with measuring only the magnetoresistance (EDESR) and transmission (ODMR) spectra within the frameworks of the excitonic normal-mode coupling caused by the microcavities embedded in the Si-QW plane. The new resonant positive magnetoresistance data are interpreted here in terms of the interference transition in the diffusive transport of free holes, respectively, between the weak antilocalization regime in the region far from the ESR of a paramagnetic point defect located inside or near the conductive channel and the weak localization regime in the nearest region of the ESR of that defect. 相似文献
87.
This paper contains a review of the authors’ results in the theory of algorithm complexity. The results described concern
methods for obtaining lower bounds (containing almost all exponential lower bounds on monotone complexity of monotone functions),
synthesis of asymptotically optimal functional networks, minimization of Boolean functions, and the problem of solving Boolean
equations. 相似文献
88.
V. B. Kudryavtsev I. S. Grunskii V. A. Kozlovskii 《Journal of Mathematical Sciences》2010,169(4):481-532
This review contains some final results of research in the area of analysis and synthesis of finite automata by their behavior. 相似文献
89.
L. P. Babich A. Yu. Kudryavtsev M. L. Kudryavtseva I. M. Kutsyk 《Journal of Experimental and Theoretical Physics》2008,106(1):65-76
Gamma-ray pulses are calculated from 2D numerical simulations of an upward atmospheric discharge in a self-consistent electric
field using the multigroup approach to the kinetics of relativistic runaway electrons (REs). Computed γ-ray numbers and spectra
are consistent with those of terrestrial γ-ray flashes (TGFs) observed aboard spacecrafts. The RE flux is concentrated mainly
within the domain of the Blue Jet fluorescence. This confirms that exactly the domain adjacent to a thundercloud is the source
of the observed γ-ray flashes. The yield of photonuclear neutrons is calculated. One γ-ray pulse generates ∼1014–1015 neutrons. The possibility of the direct deposition of REs to the detector readings and the origin of the lightning-advanced
TGFs are discussed.
The text was submitted by the authors in English. 相似文献
90.
V. A. Kudryavtsev L. Pandola V. Tomasello 《The European Physical Journal A - Hadrons and Nuclei》2008,36(2):171-180
Background induced by neutrons in deep underground laboratories is a critical issue for all experiments looking for rare events,
such as dark matter interactions or neutrinoless ββ decay. Neutrons can be produced either by natural radioactivity, via spontaneous
fission or (α, n) reactions, or by interactions initiated by high-energy cosmic rays. In all underground experiments, Monte Carlo simulations
of neutron background play a crucial role for the evaluation of the total background rate and for the optimization of rejection
strategies. The Monte Carlo methods that are commonly employed to evaluate neutron-induced background and to optimize the
experimental setup, are reviewed and discussed. Focus is given to the issue of reliability of Monte Carlo background estimates.
We dedicate this work to the memory of our friend and colleague Nicola Ferrari, who prematurely passed away in July 2006. 相似文献