全文获取类型
收费全文 | 11628篇 |
免费 | 2230篇 |
国内免费 | 4003篇 |
专业分类
化学 | 9138篇 |
晶体学 | 487篇 |
力学 | 764篇 |
综合类 | 381篇 |
数学 | 1419篇 |
物理学 | 5672篇 |
出版年
2024年 | 29篇 |
2023年 | 137篇 |
2022年 | 453篇 |
2021年 | 403篇 |
2020年 | 408篇 |
2019年 | 388篇 |
2018年 | 368篇 |
2017年 | 468篇 |
2016年 | 474篇 |
2015年 | 570篇 |
2014年 | 676篇 |
2013年 | 899篇 |
2012年 | 907篇 |
2011年 | 1055篇 |
2010年 | 943篇 |
2009年 | 1068篇 |
2008年 | 1155篇 |
2007年 | 970篇 |
2006年 | 971篇 |
2005年 | 892篇 |
2004年 | 681篇 |
2003年 | 490篇 |
2002年 | 500篇 |
2001年 | 523篇 |
2000年 | 562篇 |
1999年 | 300篇 |
1998年 | 185篇 |
1997年 | 140篇 |
1996年 | 130篇 |
1995年 | 123篇 |
1994年 | 115篇 |
1993年 | 115篇 |
1992年 | 119篇 |
1991年 | 79篇 |
1990年 | 98篇 |
1989年 | 72篇 |
1988年 | 53篇 |
1987年 | 63篇 |
1986年 | 47篇 |
1985年 | 35篇 |
1984年 | 33篇 |
1983年 | 29篇 |
1982年 | 16篇 |
1981年 | 22篇 |
1980年 | 18篇 |
1979年 | 22篇 |
1978年 | 12篇 |
1966年 | 7篇 |
1965年 | 7篇 |
1964年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
DING Bin-Gang ZHANG Da-Li LU Ding-Hui 《理论物理通讯》2006,46(1):113-118
We calculate the binding energies of Ni, Cu, Xe, Cs, Pt, Au, Np, Pu isotope chains using two interaction parameter sets NL-3 and NL-Z, and compared the relative errors of the even-even nuclei with those of odd-even nuclei and odd-odd nuclei. We find that the errors of binding energy of odd-even and odd-odd nuclei are not bigger than the one of even-even nuclei. The result shows that comparing with even-even nuclei, there is no systematic error and approximation in the calculations of the binding energy of odd-even and odd-odd nuclei with relativistic mean-field theory. In addition, the result is explained theoretically. 相似文献
2.
非线性奇异边值问题的正解 总被引:1,自引:0,他引:1
路慧芹 《应用泛函分析学报》2002,4(3):217-221
利用锥映射的不动点指数定量,研究了一类非线性奇异边值问题多个正解的存在性问题。在构造的解的存在条件之下,证明了奇异边值问题至少有两个正解的存在性定理。 相似文献
3.
建立了相变热力学理论和场论的关系. 强调在量子场论中必须引进序参量场, 则相变的讨论就类似于Goldstone bosons 的产生. 如果只讨论一级相变, Goldstone bosons场就足够了; 如果要讨论二级相变, 则必须讨论一系列的场, 这些场构成一个对称群的表示. 另外, 也将这一思想用到色超导中. In this paper we built a relation between the thermodynamical theory of the phase transition and field theory. We emphasized that in the quantum field theory we have to introduce the order parameter fields. Then the discussion of the phase transition is closed to the creation of the Goldstone bosons. If we only discuss the first order transition, the Goldstone bosons fields are sufficient. If we want to discuss the second order transition, we have to discuss a set of fields that constructs a representation of a symmetry group. We also apply this concept to color superconductivity. 相似文献
5.
6.
7.
8.
Based on the complexation between proteins and Cu(II) coupled with the time-resolved chemiluminescence (CL) technique, a highly sensitive and quantitative assay for measuring proteins in solution is described. The complexes of proteins with Cu(II) have a strongly catalytic effect on the luminol-H2O2 CL reaction. Because the CL emission produced by the complexes is much more long-lived than that by Cu(II), the CL signals originating from proteins can be easily identified and measured with a time-resolved technique. On this basis, bovine albumin fraction V (BAF V) can be quantitatively determined in the range of 0.01 - 5.0 microg/ml with a detection limit of 5.8 ng/ml. The results show that the proposed assay exhibits a small variation in the response values for the same amount of different proteins, as compared to the Lowry as well as Bradford assays. The CL assay has also been studied for the detection of immobilized proteins. 相似文献
9.
V.I. Fernández A. Iucci C.M. Naón 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,30(1):53-56
We present an extension of the Tomonaga-Luttinger model in which left and right-moving particles have different Fermi velocities.
We derive expressions for one-particle Green's functions, momentum-distributions, density of states, charge compressibility
and conductivity as functions of both the velocity difference ε and the strength of the interaction β. This allows us to identify
a novel restricted region in the parameter space in which the system keeps the main features of a Luttinger liquid but with
an unusual behavior of the density of states and the static charge compressibility κ. In particular κ diverges on the boundary
of the restricted region, indicating the occurrence of a phase transition.
Received 20 May 2002 / Received in final form 23 August 2002 Published online 19 November 2002 相似文献
10.
Jiguo Yu Qiuju Bian Guizhen Liu Na Wang 《Journal of Applied Mathematics and Computing》2007,25(1-2):283-291
A simple graphG is said to be fractionaln-factor-critical if after deleting anyn vertices the remaining subgraph still has a fractional perfect matching. For fractionaln-factor-criticality, in this paper, one necessary and sufficient condition, and three sufficient conditions related to maximum matching, complete closure are given. 相似文献