全文获取类型
收费全文 | 271篇 |
免费 | 3篇 |
专业分类
化学 | 131篇 |
晶体学 | 9篇 |
力学 | 17篇 |
数学 | 33篇 |
物理学 | 84篇 |
出版年
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 7篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 10篇 |
2013年 | 13篇 |
2012年 | 11篇 |
2011年 | 3篇 |
2010年 | 4篇 |
2009年 | 7篇 |
2008年 | 13篇 |
2007年 | 17篇 |
2006年 | 6篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 7篇 |
2002年 | 8篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 7篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1973年 | 6篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1918年 | 2篇 |
排序方式: 共有274条查询结果,搜索用时 125 毫秒
101.
A. F. Sadykov A. P. Gerashchenko Yu. V. Piskunov V. V. Ogloblichev A. G. Smol’nikov S. V. Verkhovskii A. Yu. Yakubovskii E. A. Tishchenko A. A. Bush 《Journal of Experimental and Theoretical Physics》2012,115(4):666-672
The complex NMR study of the magnetic structure of LiCu2O2 multiferroic has been performed. It has been shown that the spin spirals in LiCu2O2 are beyond the ab, bc, and ac crystallographic planes. The external magnetic field applied along the c axis of the crystal does not change the spatial orientation of spirals in Cu2+ chains. A magnetic field of H 0 = 94 kOe applied along the a and b axes rotates the planes of spin spirals in chains, tending to orient the normal n of spirals along the external magnetic field. The rotation angle of the planes of the magnetic moments are maximal at H 0 ?? b. 相似文献
102.
V. I. Torgashev A. S. Prokhorov G. A. Komandin E. S. Zhukova V. B. Anzin V. M. Talanov L. M. Rabkin A. A. Bush M. Dressel B. P. Gorshunov 《Physics of the Solid State》2012,54(2):350-359
The nature of the phonon and magnon modes in the CoCr2O4 multiferroic with a cubic spinel structure has been studied using submillimeter spectroscopy and infrared Fourier spectroscopy.
This paper reports on the first measurement of the evolution with temperature of the exchange optical magnon in the ferrimagnetic
(T
C
= 94 K) and two low-symmetry (T
S
≈ 26 K, T
lock-in = 14.5 K) phases of CoCr2O4 down to T = 5 K in zero magnetic field. It has been shown that the detected magnon is not a ferrimagnetic order parameter and originates,
most probably, from spin precession in the cobalt sublattices. At the points of the magnetic phase transitions, the oscillator
parameters of the two lowest-frequency phonon modes reveal an anomalous temperature behavior, thus evidencing the presence
of significant interaction between the magnetic and phonon subsystems. The increase by 25% of the damping parameter of the
phonon mode originating from vibrations of the CoO4 tetrahedra during the transition of CoCr2O4 to the multiferroic state (T < T
S
) suggests structural changes in the lattice involving loss of spatial central symmetry of the medium. 相似文献
103.
104.
Layered thick-film composites containing one lead zirconate titanate (PZT) layer, one nickel zinc ferrite (NZF) layer, two
PZT-NZF layers, or three PZT-NZF-PZT layers each 40–50 μm thick are prepared. The layers are applied by screen printing on
a ceramic aluminum oxide substrate with a preformed contact (conducting) layer. The dielectric properties of the composites
are studied in the temperature interval 80–900 K and the frequency interval 25 Hz-1 MHz. Polarized samples exhibit piezoelectric,
pyroelectric, and magnetoelectric effects. In tangentially magnetized two- and three-layer composites, the magnetoelectric
conversion factor equals 57 kV/(m T) at low frequencies and reaches 2000 kV/(m T) at the mechanical resonance frequency. 相似文献
105.
Komandin G. A. Porodinkov O. E. Chuchupal S. V. Seregin D. S. Spektor I. E. Goncharov Yu. G. Bush A. A. Koroleva A. F. Torgashev V. I. 《Physics of the Solid State》2018,60(12):2440-2449
Physics of the Solid State - The methods of broadband dielectric spectroscopy are used to study the effect of substitution of Fe3+ by Sc3+ in Pb(Fe1 – xScx)2/3W1/3O3 solid... 相似文献
106.
L. E. Svistov L. A. Prozorova A. M. Farutin A. A. Gippius K. S. Okhotnikov A. A. Bush K. E. Kamentsev é. A. Tishchenko 《Journal of Experimental and Theoretical Physics》2009,108(6):1000-1009
The magnetic properties of LiCu2O2 single-crystal samples without twinning are investigated using electron spin resonance and nuclear magnetic resonance spectroscopy. The experimental results obtained are described in terms of the model of a planar spiral antiferromagnet for the orientation of the magnetic field H ‖ b or H ‖ c and the model of a collinear spin-modulated antiferromagnet for the orientation of the static magnetic field H ‖ a. 相似文献
107.
Optical activity of single-strand oligonucleotides 总被引:1,自引:0,他引:1
108.
109.
A. A. Levin Yu. F. Shepelev Yu. I. Smolin A. A. Bush B. N. Romanov 《Journal of Structural Chemistry》1994,35(5):577-584
Crystal structure of a new high-temperature superconductor Bi4Sr4CaCu3O14+x is determined (AgKα, a=5.411(2), b=5.417(3), c=27.75(1) Å, space group Pbmm, R=8.80%, Rw=11.92%, 248 F(hkl)). The structure has two types of copper-oxygen layers with diverse coordination of oxygen to Cu. The separate BiO layers of the (BiO)2 double layer differ in structure. Percolation methods are used to relate superconductive properties of the new superconductor to defectiveness of its cationic sublattice. 相似文献
110.