全文获取类型
收费全文 | 16669篇 |
免费 | 3033篇 |
国内免费 | 3106篇 |
专业分类
化学 | 10494篇 |
晶体学 | 447篇 |
力学 | 2380篇 |
综合类 | 110篇 |
数学 | 554篇 |
物理学 | 8823篇 |
出版年
2024年 | 34篇 |
2023年 | 261篇 |
2022年 | 495篇 |
2021年 | 641篇 |
2020年 | 753篇 |
2019年 | 635篇 |
2018年 | 578篇 |
2017年 | 743篇 |
2016年 | 864篇 |
2015年 | 724篇 |
2014年 | 959篇 |
2013年 | 1357篇 |
2012年 | 1184篇 |
2011年 | 1303篇 |
2010年 | 1107篇 |
2009年 | 1140篇 |
2008年 | 1121篇 |
2007年 | 1191篇 |
2006年 | 1029篇 |
2005年 | 893篇 |
2004年 | 875篇 |
2003年 | 761篇 |
2002年 | 727篇 |
2001年 | 560篇 |
2000年 | 482篇 |
1999年 | 356篇 |
1998年 | 376篇 |
1997年 | 265篇 |
1996年 | 237篇 |
1995年 | 182篇 |
1994年 | 168篇 |
1993年 | 100篇 |
1992年 | 135篇 |
1991年 | 89篇 |
1990年 | 77篇 |
1989年 | 56篇 |
1988年 | 61篇 |
1987年 | 43篇 |
1986年 | 49篇 |
1985年 | 42篇 |
1984年 | 33篇 |
1983年 | 17篇 |
1982年 | 30篇 |
1981年 | 14篇 |
1980年 | 5篇 |
1979年 | 11篇 |
1978年 | 12篇 |
1976年 | 5篇 |
1973年 | 8篇 |
1957年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Nanocrystalline FeS2 cathode material of lithium cell was synthesized from cheap materials of FeSO4, Na2S2O3, and sulfur by a hydrothermal process. The scanning electron microscopy analysis showed the obtained material was nano-sized,
about 500 nm. The X-ray powder diffraction analysis showed that the synthetic FeS2 material had two phases of the crystalline structure, pyrite and marcasite. The phase of marcasite seems to have no negative
effect on the electrochemical performance of the material. The synthetic FeS2 showed a significant improvement of electrochemical performance for Li/FeS2 cells. 相似文献
112.
回热器是脉管制冷机的关键部件之一,其效率对脉管制冷机性能有很大影响。铅丸是常见的蓄冷材料,通常用于回热器的低温端。本文测试和分析了不同品质的国产铅丸和进口铅丸对单级G-M型脉管制冷机性能的影响。采用额定功率为6.0 kW的压缩机驱动,使用进口铅丸脉管制冷机最低制冷温度达12.9 K,这是当前单级脉管制冷机达到的最低制冷温度;40 K时的最大制冷量为57.4 W。使用国产铅丸最低制冷温度为13.6 K,40 K时的最大制冷量为55.9 W。本文对低温制冷机蓄冷材料选择具有一定的参考价值。 相似文献
113.
114.
S. C. Tiwari 《Foundations of Physics Letters》2006,19(1):51-62
Advances in gauge theories and unified theories have not thrown light on the meaning of electron. The problem of the origin
of electronic charge is made precise, new insights gained from Weyl space are summarized, and the origin of charge in terms
of fractional spin is suggested. A new perspective on the abelian Chern-Simons theory is presented to explain charge. 相似文献
115.
Bianchi type-III magnetized cosmological model when the field of gravitation is governed by either a perfect fluid or cosmic
string is investigated in Rosen’s [1] bimetric theory of gravitation. To complete determinate solution, the condition, viz.,
A=(BC)
n
, where n is a constant, between the metric potentials is used. We have assumed different equations of state for cosmic string [2]
for the complete solution of the model. Some physical and geometrical properties of the exhibited model are discussed and
studied. 相似文献
116.
In this short communication, we have evaluated the effect of thermal velocity of the plasma particles on the energy of resonantly
interacting energetic electrons with the propagating whistler mode waves as a function of wave frequency and L-value for the
normal and disturbed magnetospheric conditions. During the disturbed conditions when the magnetosphere is depleted in electron
density, the resonance energy of the electron enhances by an order of magnitude at higher latitudes, whereas the effect is
small at low latitudes. An attempt is made to explain the enhanced wave activity observed during magnetic storm periods. 相似文献
117.
118.
R. Lü H. Pan J.-L. Zhu B.-L. Gu 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,26(4):479-491
The tunneling of a giant spin at excited levels is studied theoretically in mesoscopic magnets with a magnetic field at an
arbitrary angle in the easy plane. Different structures of the tunneling barriers can be generated by the magnetocrystalline
anisotropy, the magnitude and the orientation of the field. By calculating the nonvacuum instanton solution explicitly, we
obtain the tunnel splittings and the tunneling rates for different angle ranges of the external magnetic field ( θ
H = π/2 and π/2 < θ
H < π). The temperature dependences of the decay rates are clearly shown for each case. It is found that the tunneling rate
and the crossover temperature depend on the orientation of the external magnetic field. This feature can be tested with the
use of existing experimental techniques.
Received 12 March 2001 and Received in final form 18 October 2001 相似文献
119.
Existence of a solution for a Signorini contact problem for Maxwell-Norton materials 总被引:1,自引:0,他引:1
The aim of this article is to study the quasistatic evolutionof a MaxwellNorton three-dimensional viscoelastic solidwith contact constraints. After introducing the appropiate functionalframework, we will discretize the problem in time using an implicitscheme whose resultant variational inequality is well posed.By using monotonicity arguments together with compensated compactnesstechniques, we will prove that the corresponding discrete solutionconverges to a solution of the continuous problem. 相似文献
120.
采用模匹配方法,研究了非均匀磁场下开放的四端量子波导中的电子输运性质. 结果表明,从一端入射的电子可以透射到两个与之垂直的输出端和一个与之平行的输出端. 在没有外加磁场的情况下,两个垂直输出端的输运概率是相同的,但垂直端与水平端的输运概率不同;在外加磁场下,由于磁边缘态效应,两个垂直输出端的输运概率也有着相当大的差别. 通过施加不同的磁场,我们能获得丰富的电子输运结构,如台阶,宽谷,尖峰等;通过调节磁场的大小和比例以及结构参数可控制该量子结构在各输出端的输运概率.
关键词:
电子输运
介观体系
磁效应 相似文献