全文获取类型
收费全文 | 18981篇 |
免费 | 785篇 |
国内免费 | 6篇 |
专业分类
化学 | 11084篇 |
晶体学 | 65篇 |
力学 | 352篇 |
数学 | 2865篇 |
物理学 | 5406篇 |
出版年
2023年 | 152篇 |
2021年 | 185篇 |
2020年 | 248篇 |
2019年 | 194篇 |
2018年 | 256篇 |
2017年 | 246篇 |
2016年 | 491篇 |
2015年 | 481篇 |
2014年 | 491篇 |
2013年 | 963篇 |
2012年 | 954篇 |
2011年 | 1158篇 |
2010年 | 525篇 |
2009年 | 464篇 |
2008年 | 984篇 |
2007年 | 966篇 |
2006年 | 894篇 |
2005年 | 791篇 |
2004年 | 634篇 |
2003年 | 584篇 |
2002年 | 532篇 |
2001年 | 400篇 |
2000年 | 320篇 |
1999年 | 279篇 |
1998年 | 223篇 |
1997年 | 238篇 |
1996年 | 249篇 |
1995年 | 224篇 |
1994年 | 198篇 |
1993年 | 217篇 |
1992年 | 217篇 |
1991年 | 180篇 |
1990年 | 155篇 |
1989年 | 141篇 |
1988年 | 132篇 |
1987年 | 147篇 |
1986年 | 147篇 |
1985年 | 179篇 |
1984年 | 214篇 |
1983年 | 177篇 |
1982年 | 205篇 |
1981年 | 209篇 |
1980年 | 203篇 |
1979年 | 178篇 |
1978年 | 197篇 |
1977年 | 188篇 |
1976年 | 169篇 |
1975年 | 156篇 |
1974年 | 138篇 |
1973年 | 128篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
81.
P. Cicman M. Francis J.D. Skalny S. Matejcik T.D. Märk 《Czechoslovak Journal of Physics》2003,53(3):181-190
The rate constant for dissociative electron attachment to ozone has been derived over the energy range from about 0 to 10 eV using recently measured and also corrected cross section data. The new rate constant data sets for two partial dissociative channels, as well as for the total dissociative electron attachment, are compared with previously reported values, and existing discrepancies are discussed. 相似文献
82.
83.
Hyperfine Interactions - During batch sorption experiments of heavy metals on chlorite not only sorption reactions take place, but also reactions of chemical weathering leading to mineral... 相似文献
84.
András Sütő 《Journal of statistical physics》2003,112(1-2):375-396
We study condensation of trapped bosons in the limit when the number of particles tends to infinity. For the noninteracting gas we prove that there is no phase transition in any dimension, but in any dimension, at any temperature the system is 100% condensated into the one-particle ground state. In the case of an interacting gas we show that for a family of suitably scaled pair interactions, the Gross–Pitaevskii scaling included, a less-than-100% condensation into a single-particle eigenstate, which may depend on the interaction strength, persists at all temperatures. 相似文献
85.
Introduction to Hardy Spaces 总被引:1,自引:1,他引:0
H. Baumgärtel 《International Journal of Theoretical Physics》2003,42(10):2213-2223
Basic material from the theory of Hardy spaces is presented. The principle of positive energy representations is used as motivation to introduce these spaces. 相似文献
86.
Heiko Herrmann W. Muschik G. Rückner H.-H. von Borzeszkowski 《Foundations of Physics》2004,34(6):1005-1021
The 24 components of the relativistic spin tensor consist of 3 + 3 basic spin fields and 9 + 9 constitutive fields. Empirically only three basic spin fields and nine constitutive fields are known. This empirem can be expressed by two spin axioms, one of them denying purely relativistic spin fields, and the other one relating the three additional basic fields and the nine additional constitutive fields to the known (and measurable) ones. This identification by the spin axioms is material-independent and does not mix basic spin fields with constitutive properties. The approaches to the Weyssenhoff fluid and the Dirac-electron fluid found in literature are discussed with regard to these spin axioms. The conjecture is formulated, that another reduction from six to three basic spin fields which does not obey the spin axioms introduces special material properties by not allowed mixing of constitutive and basic fields. 相似文献
87.
88.
A calibration technique for the constant-temperature hot-wire anemometer is presented, which is based on traversing the probe
through the boundary layer of a flat plate while simultaneously performing fluctuation measurements. The free stream Mach
number was M = 2.54, and the Reynolds number Red, based on wire diameter, ranged from 9 to 23. A comparison of the sensitivity values obtained with the aid of such a calibration
procedure — under the condition of neglecting low temperature loadings (t<0.6) — agrees well with sensitivities determined with free-stream data-The use of a modified transfer function for correcting
the power spectra of flow perturbations revealed a conformity of wide parts of the corrected spectra with the Kolmogorov decay.
The fluctuation levels of total temperature and mass flux were computed for the boundary layer of a flat plate.
This work was presented at the International Conference on the Methods of Aerophysical Research ICMAR 2007, which was held
in Novosibirsk on 5–10 February 2007. 相似文献
89.
Let R be a local ring and let (x
1, …, x
r) be part of a system of parameters of a finitely generated R-module M, where r < dimR
M. We will show that if (y
1, …, y
r) is part of a reducing system of parameters of M with (y
1, …, y
r) M = (x
1, …, x
r) M then (x
1, …, x
r) is already reducing. Moreover, there is such a part of a reducing system of parameters of M iff for all primes P ε Supp M ∩ V
R(x
1, …, x
r) with dimR
R/P = dimR
M − r the localization M
P of M at P is an r-dimensional Cohen-Macaulay module over R
P.
Furthermore, we will show that M is a Cohen-Macaulay module iff y
d is a non zero divisor on M/(y
1, …, y
d−1) M, where (y
1, …, y
d) is a reducing system of parameters of M (d:= dimR
M). 相似文献
90.