全文获取类型
收费全文 | 1870篇 |
免费 | 37篇 |
国内免费 | 121篇 |
专业分类
化学 | 243篇 |
晶体学 | 11篇 |
力学 | 152篇 |
综合类 | 2篇 |
数学 | 757篇 |
物理学 | 863篇 |
出版年
2024年 | 4篇 |
2023年 | 23篇 |
2022年 | 24篇 |
2021年 | 19篇 |
2020年 | 31篇 |
2019年 | 30篇 |
2018年 | 29篇 |
2017年 | 27篇 |
2016年 | 41篇 |
2015年 | 33篇 |
2014年 | 69篇 |
2013年 | 171篇 |
2012年 | 88篇 |
2011年 | 141篇 |
2010年 | 101篇 |
2009年 | 143篇 |
2008年 | 109篇 |
2007年 | 110篇 |
2006年 | 100篇 |
2005年 | 58篇 |
2004年 | 48篇 |
2003年 | 62篇 |
2002年 | 85篇 |
2001年 | 44篇 |
2000年 | 71篇 |
1999年 | 56篇 |
1998年 | 61篇 |
1997年 | 39篇 |
1996年 | 22篇 |
1995年 | 34篇 |
1994年 | 22篇 |
1993年 | 8篇 |
1992年 | 22篇 |
1991年 | 8篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 12篇 |
1985年 | 5篇 |
1984年 | 10篇 |
1982年 | 2篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 2篇 |
1973年 | 2篇 |
排序方式: 共有2028条查询结果,搜索用时 0 毫秒
11.
Ya.G. Groda P. Argyrakis G.S. Bokun V.S. Vikhrenko 《The European Physical Journal B - Condensed Matter and Complex Systems》2003,32(4):527-535
The selfconsistent diagram approximation (SCDA) is generalized for three-dimensional lattice gases with nearest neighbor repulsive
interactions. The free energy is represented in a closed form through elementary functions. Thermodynamical (phase diagrams,
chemical potential and mean square fluctuations), structural (order parameter, distribution functions) as well as diffusional
characteristics are investigated. The calculation results are compared with the Monte Carlo simulation data to demonstrate
high precision of the SCDA in reproducing the equilibrium lattice gas characteristics. It is shown that similarly to two-dimensional
systems the specific statistical memory effects strongly influence the lattice gas diffusion in the ordered states.
Received 7 August 2002 / Received in final form 22 January 2003 Published online 24 April 2003 相似文献
12.
Nicholas A. Loehr 《Discrete Mathematics》2004,280(1-3):233-236
This note generalizes André's reflection principle to give a new combinatorial proof of a formula for the number of lattice paths lying within certain trapezoids. 相似文献
13.
We give asymptotic formulas for the multiplicities of weights and irreducible summands in high-tensor powers Vλ⊗N of an irreducible representation Vλ of a compact connected Lie group G. The weights are allowed to depend on N, and we obtain several regimes of pointwise asymptotics, ranging from a central limit region to a large deviations region. We use a complex steepest descent method that applies to general asymptotic counting problems for lattice paths with steps in a convex polytope. 相似文献
14.
15.
A low-temperature expansion for the free energy density of lattice animals is derived. Analysis of the series yields a collapse transition temperature ofT
c - 0.54, in close agreement with previous estimates. It is demonstrated that
p,k, the number ofp-particle,p-bond animals, obeys the asymptotic scaling law log
p,k
pg(k/p) + o(p). The low-temperature series and numerical data are used to estimate the scaling function. 相似文献
16.
Boguslaw Zegarliński 《Journal of statistical physics》1986,43(3-4):687-705
We give a condition on a Gibbs measure for an attractive Markov specification, which assures extremality and the global Markov property. As an example of application we consider the class of attractive Markov specifications defined on a compact configuration space over a two-dimensional lattice by the interaction Hamiltonians (assumed to have a finite set of periodic ground configurations) satisfying Peierl's condition. We prove that each extremal Gibbs measure for such a specification, at sufficiently low temperature, has the global Markov property.On leave of absence from the Institute of Theoretical Physics, University of Wrocaw, Poland. 相似文献
17.
Analytical solutions of the lattice Boltzmann BGK model 总被引:1,自引:0,他引:1
Analytical solutions of the two-dimensional triangular and square lattice Boltzmann BGK models have been obtained for the plane Poiseuille flow and the plane Couette flow. The analytical solutions are written in terms of the characteristic velocity of the flow, the single relaxation time , and the lattice spacing. The analytic solutions are the exact representation of these two flows without any approximation. Using the analytical solution, it is shown that in Poiseuille flow the bounce-back boundary condition introduces an error of first order in the lattice spacing. The boundary condition used by Kadanoffet al. in lattice gas automata to simulate Poiseuille flow is also considered for the triangular lattice Boltzmann BGK model. An analytical solution is obtained and used to show that the boundary condition introduces an error of second order in the lattice spacing. 相似文献
18.
El-B. Yallaoui 《Periodica Mathematica Hungarica》1991,23(2):109-120
Let X be an abstract set and L a lattice of subsets of X. To each lattice regular measure µ, we associate two induced measures
and
on suitable lattices of the Wallman space IR(L) and another measure µ on the spaceIR(L). We will investigate the reflection of smoothness properties of p onto
,
and µ; and try to set some new criterion for repleteness and measure repleteness. 相似文献
19.
偏序集上的滤子极大理想 总被引:3,自引:1,他引:2
在偏序集上引入并考察了滤子极大理想的概念,证明了相应的存在性定理。引入并考察了伪极大元和伪既约元的概念,利用图表的形式对连续格中各种类型的既约元和素元之间的关系进行了归纳总结,完善了文献《Continuous Lattices and Domains》(作者:G.Gierz,et al)中的一个图表的相关内容,填补了在分配的连续格情形该图表的一个未知内容,部分地回答了该文献中的一个问题。 相似文献
20.