全文获取类型
收费全文 | 1132篇 |
免费 | 83篇 |
国内免费 | 148篇 |
专业分类
化学 | 24篇 |
晶体学 | 2篇 |
力学 | 94篇 |
综合类 | 10篇 |
数学 | 147篇 |
物理学 | 706篇 |
综合类 | 380篇 |
出版年
2023年 | 3篇 |
2022年 | 9篇 |
2021年 | 9篇 |
2020年 | 16篇 |
2019年 | 16篇 |
2018年 | 13篇 |
2017年 | 17篇 |
2016年 | 12篇 |
2015年 | 21篇 |
2014年 | 46篇 |
2013年 | 50篇 |
2012年 | 50篇 |
2011年 | 62篇 |
2010年 | 45篇 |
2009年 | 64篇 |
2008年 | 68篇 |
2007年 | 74篇 |
2006年 | 66篇 |
2005年 | 68篇 |
2004年 | 71篇 |
2003年 | 69篇 |
2002年 | 57篇 |
2001年 | 47篇 |
2000年 | 39篇 |
1999年 | 39篇 |
1998年 | 53篇 |
1997年 | 30篇 |
1996年 | 19篇 |
1995年 | 26篇 |
1994年 | 29篇 |
1993年 | 14篇 |
1992年 | 25篇 |
1991年 | 21篇 |
1990年 | 16篇 |
1989年 | 17篇 |
1988年 | 23篇 |
1987年 | 13篇 |
1986年 | 16篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有1363条查询结果,搜索用时 31 毫秒
81.
R Parthasarathy 《Pramana》1989,32(4):563-572
Gribov ambiguity in gauge field theories is discussed and it is shown that such an ambiguity exists even for Abelian theories
in covariant gauge at finite temperature. Both geometric and algebraic proofs are presented. In view of the importance of
non-perturbative methods, some special gauges are given in which such ambiguities do not exist or are not relevant. The significance
of these in the study of confinement in QCD is pointed out. 相似文献
82.
立交桥多跨连续梁复位监测 总被引:1,自引:0,他引:1
某立交桥在长期使用中,弯桥处多跨连续梁发生横向滑移近40cm,为此对该梁进行顶升和横移的复位施工。使用位移传感器对多跨连续梁的顶升和降落进行监测和控制,同时使用应变片监测多跨连续梁的应力。监测结果表明,相邻桥墩处的连续梁最大竖向位移差在3.40~7.89mm之间,连续梁产生的最大附加应力在-2.06~1.78MPa之间,连续梁没有裂缝产生,从而确保了多跨连续梁在复位施工中的安全。同时对钢支架的应力进行监测,得出钢管混凝土柱始终处于严重偏心受压状态的结论。在长时间监测中,采取分段测试然后测试数据累加的方法,减小了应变仪连续使用中的漂移问题。该桥的监测方法也可以用于其它桥梁的施工中。 相似文献
83.
腐蚀磨损协同作用率的研究 总被引:7,自引:5,他引:7
提出了腐蚀与磨损“协同作用”的概念,并用于判断腐蚀与磨损协同作用的性质及大小和确定腐蚀磨损过程中材料损失的主要形式。介绍了协同作用率的测定方法,并以G105钢及化学镀Ni-P合金在5.0%NaCl溶液中的腐蚀腐损作为研究对象,研究了载荷、滑动速度对腐蚀磨损协同作用的影响。结果表明:协同作用率随载荷增大而增大,随滑动速度增大而减小。 相似文献
84.
We study the stationary points of what is known as the lattice Landau gauge fixing functional in one-dimensional compact U(1) lattice gauge theory, or as the Hamiltonian of the one-dimensional random phase XY model in statistical physics. An analytic solution of all stationary points is derived for lattices with an odd number of lattice sites and periodic boundary conditions. In the context of lattice gauge theory, these stationary points and their indices are used to compute the gauge fixing partition function, making reference in particular to the Neuberger problem. Interpreted as stationary points of the one-dimensional XY Hamiltonian, the solutions and their Hessian determinants allow us to evaluate a criterion which makes predictions on the existence of phase transitions and the corresponding critical energies in the thermodynamic limit. 相似文献
85.
86.
We present an off-shell generating function for all cubic interactions of higher spin gauge fields constructed in Manvelyan et al. (2010) [1]. It is a generalization of the on-shell generating function proposed by Sagnotti and Taronna [2], is written in a very compact way, and turns out to have a remarkable structure. 相似文献
87.
The 2-dimensional BF theory is both a gauge theory and a topological Poisson σ-model corresponding to a linear Poisson bracket. In [3], Torossian discovered a connection which governs correlation functions of the BF theory with sources for the B-field. This connection is flat, and it is a close relative of the KZ connection in the WZW model. In this Letter, we show that flatness of the Torossian connection follows from (properly regularized) quantum equations of motion of the BF theory. 相似文献
88.
We study a lattice QCD mixed action with overlap valence quarks on two flavours of Wilson maximally twisted mass sea quarks. Employing three different matching conditions to relate both actions to each other, we investigate the continuum limit by using three values of the lattice spacing ranging from a≈0.05 fm to 0.08 fm. A particular emphasis is put on the effect on physical observables of the topological zero modes appearing in the valence overlap operator. We estimate the region of parameter space where the contribution from these zero modes is sufficiently small such that their effects can be safely controlled and a restoration of unitarity of the mixed action in the continuum limit is reached. 相似文献
89.
90.
Computation of the solutions to the gauge field equations is known of great importance for the simulation of various particle physics systems. In this work, we establish a globally convergent iterative method for computing the multiple vortex solutions arising in a self-dual system of non-Abelian gauge field equations derived in a supersymmetric theory model. Using this method, we present a few numerical examples which demonstrate the effectiveness of the method and, at the same time, provide a concrete realization of the soliton-like behavior of the vortexlines concentrated around centers of vortices, which is believed to be essential for linear confinement in QCD. 相似文献