全文获取类型
收费全文 | 674篇 |
免费 | 5篇 |
国内免费 | 4篇 |
专业分类
化学 | 386篇 |
晶体学 | 11篇 |
力学 | 12篇 |
数学 | 54篇 |
物理学 | 220篇 |
出版年
2022年 | 5篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2017年 | 3篇 |
2016年 | 13篇 |
2015年 | 4篇 |
2014年 | 23篇 |
2013年 | 36篇 |
2012年 | 25篇 |
2011年 | 31篇 |
2010年 | 17篇 |
2009年 | 13篇 |
2008年 | 49篇 |
2007年 | 48篇 |
2006年 | 38篇 |
2005年 | 28篇 |
2004年 | 18篇 |
2003年 | 22篇 |
2002年 | 22篇 |
2001年 | 18篇 |
2000年 | 13篇 |
1999年 | 17篇 |
1998年 | 8篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 10篇 |
1986年 | 5篇 |
1985年 | 20篇 |
1984年 | 13篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 15篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1977年 | 4篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 6篇 |
1972年 | 5篇 |
1971年 | 3篇 |
1959年 | 2篇 |
排序方式: 共有683条查询结果,搜索用时 0 毫秒
101.
102.
Variation of thermoelectric power with thickness of the vacuum evaporated PbTe films has been investigated. The films were deposited on mica, glass, quartz and LiF substrates, under identical conditions. Attempts have been made to derive a relation which represents the variation of thermoelectric power with thickness of the film. The temperature variation of thermoelectric power has also bsen studied. 相似文献
103.
Classical and quantum theories of radiation damping in ferromagnetic and antiferromagnetic resonance
Both classical and quantum theories of radiation damping in ferromagnetic and antiferromagnetic resonance relaxation are given. Effects of demagnetization and anisotropy, that is, of elliptical classical precession, are included. In the classical theory a phenomenological approach to ferromagnetic resonance relaxation by means of the Landau-Lifshitz equation is also presented. In the quantum theory, the magnon-photon interaction Hamiltonian is derived, and the radiation-damped linewidth is obtained by computing the transition matrix element and also the one-magnon self energy. As noted long ago by Einstein, each photon is emitted in a random but specific direction, and only on average does the quantum radiation pattern reproduce the classical. To first order, however, this reproduction is shown to be exact, correcting a recent calculation by Shrivastava. 相似文献
104.
Karabi Paul T. K. Datta K. S. Chaudhuri A. K. Pal 《The Journal of the Operational Research Society》1996,47(8):1029-1036
The article investigates a deterministic inventory system with two-component demand rate. The demand rate is stock-dependent down to a certain level and then constant. Shortages are allowed and are fully backlogged. The storage space is assumed to be limited. A flowchart is provided to solve a general system. To study the effects of changes in the system parameters on the average net profit a sensitivity analysis has been performed. 相似文献
105.
106.
Using the Landau theory of phase transitions it has been shown that for a second order phase transition Ω/kBTc ? 0.01. and its isomorphs 4Ω/J1 ? 1 and for a first order transition Ω/kBTc ? 0.01. 相似文献
107.
C. Basu K. Goswami S. Chaudhuri A. Choudhury 《Journal of Physics and Chemistry of Solids》1981,42(6):527-528
Lattice imperfections were produced in KCl crystals by a thermal process. The heat treated specimen was irradiated with 50 KeV electrons and the corresponding range of electrons in the crystal has been estimated. It was found that the electron range in the crystal depends upon the temperature of heat treatment, being a decreasing function of this temperature up to about 625 K, above which it becomes an increasing function. This anomaly has been explained in terms of dissolution of vacancies through dislocation loops. 相似文献
108.
109.
N. K. Chaudhuri R. Sampathkumar R. H. Iyer 《Journal of Radioanalytical and Nuclear Chemistry》1976,33(1):53-65
Analysis of fissile materials in solution by fission track registration technique has been extended to plutonium in solution
of its alloys. In these estimations, the results agreed within 1–4% with the average of those obtained by other chemical and
instrumental methods like potentiometry, mass-spectrometry and X-ray fluorescence. Some special practical problems encountered
in the analysis of plutonium solutions are noted. Various factors affecting the results have been investigated and the necessary
precautions for reducing these errors have been indicated. The advantages of the method over some other conventional methods
have also been discussed. It is suggested that a source of about 10 μg of252Cf corresponding to a neutron flux of about 107 n·cm−2·sec−1 is ideal for these experiments. 相似文献
110.
R N Chaudhuri 《Pramana》1974,3(3):161-170
A polynomial equation is obtained for the solutions of the vibrational frequencies of one-dimensional monoatomic and diatomic lattices with particles connected by identical springs, but with arbitrary springs connecting the end particles to rigid walls. The exact expressions of the different normal modes of oscillations of the linear chain of particles for monoatomic, diatomic and defective lattices are derived in a straightforward way. As special cases of our problem we have considered the effects of different end springs on the vibrational frequencies. One interesting result is that very high frequencies are allowed when the ends of the diatomic lattice are rigidly fixed with the boundary walls. 相似文献