全文获取类型
收费全文 | 26652篇 |
免费 | 3825篇 |
国内免费 | 2536篇 |
专业分类
化学 | 3993篇 |
晶体学 | 118篇 |
力学 | 3378篇 |
综合类 | 638篇 |
数学 | 14457篇 |
物理学 | 10429篇 |
出版年
2024年 | 42篇 |
2023年 | 229篇 |
2022年 | 418篇 |
2021年 | 594篇 |
2020年 | 671篇 |
2019年 | 617篇 |
2018年 | 657篇 |
2017年 | 841篇 |
2016年 | 994篇 |
2015年 | 770篇 |
2014年 | 1498篇 |
2013年 | 1780篇 |
2012年 | 1480篇 |
2011年 | 1753篇 |
2010年 | 1511篇 |
2009年 | 1790篇 |
2008年 | 1749篇 |
2007年 | 1837篇 |
2006年 | 1688篇 |
2005年 | 1586篇 |
2004年 | 1301篇 |
2003年 | 1199篇 |
2002年 | 996篇 |
2001年 | 939篇 |
2000年 | 870篇 |
1999年 | 735篇 |
1998年 | 667篇 |
1997年 | 632篇 |
1996年 | 472篇 |
1995年 | 400篇 |
1994年 | 337篇 |
1993年 | 254篇 |
1992年 | 226篇 |
1991年 | 189篇 |
1990年 | 187篇 |
1989年 | 126篇 |
1988年 | 120篇 |
1987年 | 106篇 |
1986年 | 84篇 |
1985年 | 102篇 |
1984年 | 80篇 |
1983年 | 57篇 |
1982年 | 75篇 |
1981年 | 71篇 |
1980年 | 49篇 |
1979年 | 42篇 |
1978年 | 35篇 |
1977年 | 29篇 |
1976年 | 32篇 |
1973年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
Roderich Tumulka 《Foundations of Physics》2007,37(2):186-197
In a recent paper Conway and Kochen, Found. Phys. 36, 2006, claim to have established that theories of the Ghirardi-Rimini-Weber
(RW) type, i.e., of spontaneous wave function collapse, cannot be made relativistic. On the other hand, relativistic GRW-type
theories have already been presented, in my recent paper, J. Stat. Phys. 125, 2006, and by Dowker and Henson, J. Stat. Phys.
115, 2004. Here, I elucidate why these are not excluded by the arguments of Conway and Kochen.
相似文献
122.
Ryohei Tsuda Sayaka Kaino Hisashi Kokubo Shin-Ichiro Imabayashi Masayoshi Watanabe 《Colloids and surfaces. B, Biointerfaces》2007,56(1-2):255-Optics
Redox properties of phenothiazine-labeled poly(ethyl glycidy ether)-block-poly(ethylene oxide) (PT-EGEn-b-EOm) are reversibly changed by core-shell micelle formation. In the temperature range higher than the critical micellization temperature (cmt), the anodic potential of PT group positively shifts and concomitantly its anodic current decrease, or levels off compared to those of the reference polymer PT-EOm without the thermo-responsive EGEn segment. The former alteration is caused by incorporation of hydrophobic PT groups into a core of the micelle and the latter by the decrease in the diffusion coefficient of PT groups due to formation of the core-shell micelles. The cmt value and the temperature-dependent alteration in the redox properties strongly depend on the polymer structure, especially the length of thermo-responsive EGEn segment. The electrochemically determined hydrodynamic radii of the polymer aggregates seem to be overestimated, compared to the values reported for the aggregates of other thermo-responsive polymers with similar molecular weights, implying the presence of electrochemically inactive PT groups in the copolymers having longer thermo-responsive segments. 相似文献
123.
一个推广的Hardy-Hilbert型不等式及其逆式 总被引:1,自引:0,他引:1
本文引入单参数λ及应用Beta函数,给一个Hardy-Hilbert型不等式以具有最佳常数因子的推广,作为应用,给出了它的逆向形式. 相似文献
124.
125.
Differentiation of functions w.r.t. finite atomless measures with compact support on the real line is introduced. The related harmonic calculus is similar to that of the classical Lebesgue case. As an application we obtain the Weyl exponent for the spectral asymptotics of the Laplacians w.r.t. linear Cantor-type measures with arbitrary weights. 相似文献
126.
127.
In this paper, the deconvolution of SIMS profiles analysed at very low primary energy (0.5 keV/O2+) is addressed. The depth resolution function (DRF) of the SIMS analysis in presence of roughness is established and a deconvolution procedure is implemented without or in presence of roughness on samples containing delta-doped layers of boron in silicon. It is shown that the deconvolution procedure can lead to a great improvement of the full width at half maximum (FWHM) of the measured peaks in the case where no roughness in detected in the crater bottom. In the case where it is present, the conditions required to use a deconvolution procedure are discussed, and the deconvolution is implemented using precise and restrictive assumptions. 相似文献
128.
Differential inequality method, bounding function method and topological degree are applied to obtain the existence criterions of at least one solution for the general fourth-order differential equations under nonlinear boundary conditions, and many existing results are complemented. 相似文献
129.
J. -Ph. Jay J. Ben Youssef H. Le Gall 《Journal of magnetism and magnetic materials》2002,240(1-3):287-290
The dynamic response of trilayer magnetoresistive permalloy/Cu/Co films was studied by high-frequency permeability spectra measurements. The resonance frequency is shown to depend on the interlayer copper thickness. This dependence is related to exchange coupling between permalloy and cobalt and the interaction field is estimated using the Landau–Lifschitz–Gilbert model. 相似文献
130.