全文获取类型
收费全文 | 312篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
化学 | 122篇 |
力学 | 3篇 |
数学 | 62篇 |
物理学 | 131篇 |
出版年
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2016年 | 3篇 |
2015年 | 3篇 |
2013年 | 43篇 |
2012年 | 5篇 |
2011年 | 6篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 3篇 |
1996年 | 14篇 |
1995年 | 10篇 |
1994年 | 9篇 |
1993年 | 10篇 |
1992年 | 8篇 |
1991年 | 14篇 |
1990年 | 12篇 |
1989年 | 10篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 7篇 |
1979年 | 8篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 8篇 |
1975年 | 2篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1971年 | 4篇 |
1968年 | 2篇 |
1936年 | 4篇 |
1935年 | 3篇 |
1934年 | 2篇 |
1929年 | 2篇 |
1894年 | 1篇 |
排序方式: 共有318条查询结果,搜索用时 265 毫秒
101.
Selen M Sadoff AJ Ammar R Ball S Baringer P Coppage D Copty N Davis R Hancock N Kelly M Kwak N Lam H Kubota Y Lattery M Nelson JK Patton S Perticone D Poling R Savinov V Schrenk S Wang R Alam MS Kim IJ Nemati B O'Neill JJ Severini H Sun CR Zoeller MM Crawford G Daubenmeir CM Fulton R Fujino D Gan KK Honscheid K Kagan H Kass R Lee J Malchow R Morrow F Skovpen Y Sung M White C Whitmore J Wilson P Butler F Fu X Kalbfleisch G Lambrecht M Ross WR Skubic P Snow J Wang PL Wood M Bortoletto D Brown DN 《Physical review letters》1993,71(13):1973-1977
102.
The effects of Nd(III)/Am(III) complexation with sulfate were studied by 1) re-examining existing data for the Am–SO4 system using more, advanced aqueous electrolyte models valid to high concentration to obtain reliable thermodynamic data for SO
4
2–
complexes or ion interactions with Nd3+ and Am3+ and 2) conducting experimental solubility studies of NdPO4(c), an analog phase of AmPO
4
(c), a possibly important phase in high level nuclear wastes, in the presence of SO
4
2–
to test the newly developed thermodynamic model and show the possible influence of sulfate in a repository environment. The data showed that the increase in the solubility of NdPO
4
(c) resulted primarily from the increase in ionic strength. Slightly higher observed Nd concentrations in the presence of sulfate, as compared with concentrations predicted at the experimental ionic strengths, resulted from the weak complexes or ion interactions involving Nd
3+
–SO
4
2–
. The Pitzer ion interaction parameters, applicable to 0.5m sulfate, were obtained for Am
3+
–SO
4
2–
from a reinterpretation of known solvent extraction data. These parameters are also consistent with literature data for Am
3+
/Na+ exchange and solvent extraction in the presence of sulfate. When used for the analogous Nd
3+
–SO
4
2–
system to predict NdPO
4
(c) solubility in the presence of sulfate, they provided excellent agreement between the predicted and the observed solubilities, indicating that they can be reliably used to determine Nd
3+
or Am
3+
ion interactions with SO
4
2–
in all ground waters where SO
4
2–
is less than 0.5m 相似文献
103.
The alpha-decay of states in 18O have been studied in the inelastic scattering reaction at 82 MeV. The double differential cross sections have been analysed with a strong absorption model. A systematic dependence of emission angle on spin is observed, allowing the determination of the transferred angular momentum. 相似文献
104.
A.G. Sifalakis S.R. Fulton E.P. Papadopoulou Y.G. Saridakis 《Journal of Computational and Applied Mathematics》2009
In this work we derive the structural properties of the Collocation coefficient matrix associated with the Dirichlet–Neumann map for Laplace’s equation on a square domain. The analysis is independent of the choice of basis functions and includes the case involving the same type of boundary conditions on all sides, as well as the case where different boundary conditions are used on each side of the square domain. Taking advantage of said properties, we present efficient implementations of direct factorization and iterative methods, including classical SOR-type and Krylov subspace (Bi-CGSTAB and GMRES) methods appropriately preconditioned, for both Sine and Chebyshev basis functions. Numerical experimentation, to verify our results, is also included. 相似文献
105.
R.L. Fulton 《Physica A》1979,97(1):189-194
It is shown that the integral of <{P(rτ), P(r')}>· n? as a function of r over a volume Ve bounded by an equi-potential is independent of r' and of Ve and is determined solely by [?(ω)?1] · n? provided the dielectric constant is local and that Ve is of macroscopic dimensions. 相似文献
106.
107.
Excitation functions for 12C(6Li, 6Li)12C (gs, 4.43 MeV) have been measured at 10 angles (40° ? θcm ? 160°) over the energy range 20 MeV < Elab < 36 MeV. A single anomaly of width Γ ≈ 800 keV is observed at Elab = 22.8 MeV. The results casts doubts on the resonant two-step α-exchange mechanism suggested to occur in this system. 相似文献
108.
Certain finite-voltage current steps appearing in zero magnetic field in Josephson tunnel junctions are interpreted as arising from a novel process involving the inertial motion of one or more vortices in the junction. 相似文献
109.
110.