全文获取类型
收费全文 | 893篇 |
免费 | 74篇 |
国内免费 | 43篇 |
专业分类
化学 | 56篇 |
晶体学 | 1篇 |
力学 | 54篇 |
综合类 | 9篇 |
数学 | 438篇 |
物理学 | 452篇 |
出版年
2023年 | 3篇 |
2022年 | 7篇 |
2021年 | 11篇 |
2020年 | 23篇 |
2019年 | 26篇 |
2018年 | 31篇 |
2017年 | 24篇 |
2016年 | 20篇 |
2015年 | 18篇 |
2014年 | 34篇 |
2013年 | 60篇 |
2012年 | 31篇 |
2011年 | 43篇 |
2010年 | 40篇 |
2009年 | 48篇 |
2008年 | 42篇 |
2007年 | 60篇 |
2006年 | 47篇 |
2005年 | 56篇 |
2004年 | 43篇 |
2003年 | 49篇 |
2002年 | 55篇 |
2001年 | 25篇 |
2000年 | 35篇 |
1999年 | 40篇 |
1998年 | 22篇 |
1997年 | 14篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 7篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 4篇 |
1973年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有1010条查询结果,搜索用时 31 毫秒
81.
提出一种渐近方法用来处理一类多自由度强非线性自治振动系统,它是新渐近方法 ̄[1]的推广。本方法适用于主共振情形,我们建立了振幅和相位所满足的方程。文末用两个例子说明本方法的有效性。 相似文献
82.
83.
Paweł J. Szabłowski 《随机分析与应用》2017,35(5):852-872
We study a class of stationary Markov processes with marginal distributions identifiable by moments such that every conditional moment of degree say m is a polynomial of degree at most m. We show that then under some additional, natural technical assumption there exists a family of orthogonal polynomial martingales. More precisely we show that such a family of processes is completely characterized by the sequence {(αn, pn)}n ? 0 where α′ns are some positive reals while p′ns are some monic orthogonal polynomials. Bakry and Mazet (Séminaire de Probabilit?s, vol. 37, 2003) showed that under some additional mild technical conditions each such sequence generates some stationary Markov process with polynomial regression.We single out two important subclasses of the considered class of Markov processes. The class of harnesses that we characterize completely. The second one constitutes of the processes that have independent regression property and are stationary. Processes with independent regression property so to say generalize ordinary Ornstein–Uhlenbeck (OU) processes or can also be understood as time scale transformations of Lévy processes. We list several properties of these processes. In particular we show that if these process are time scale transforms of Lévy processes then they are not stationary unless we deal with classical OU process. Conversely, time scale transformations of stationary processes with independent regression property are not Lévy unless we deal with classical OU process. 相似文献
84.
On the symmetry analysis and conservation laws of the (1 + 1)‐dimensional Hénon–Lane–Emden system 下载免费PDF全文
Ben Muatjetjeja 《Mathematical Methods in the Applied Sciences》2017,40(5):1531-1537
We carry out a complete Lie symmetry analysis and Noether symmetry classification of the (1 + 1)‐dimensional H non–Lane–Emden system. It is shown that the principal Lie algebra, which is one dimensional, extends in several cases. It is also shown that four main cases transpire in the Noether classification with respect to the Lagrangian. In addition, conservation laws for the H non–Lane–Emden system are constructed. Furthermore, we briefly discuss the importance and the physical interpretation of these conserved vectors. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
85.
Rachid Rahouadj Jean-Franois Ganghoffer Christian Cunat 《Mechanics Research Communications》2003,30(2):119-123
In the first part of this contribution, the Lie-symmetries of the principle of least action associated to the constitutive equations of the DNLR formalism of relaxation have been presented. We examine in this second part the continuous symmetries corresponding to the simple case of stress relaxation under isothermal conditions. The well-known principle of time/temperature equivalence is discussed in terms of variational symmetry for the Jacobi’s action functional, and connected to the Onsager’s relation near the thermodynamic equilibrium. 相似文献
86.
I. V. Sturova 《Journal of Applied Mechanics and Technical Physics》2006,47(1):71-78
The effect of initial disturbances and unsteady external loading on an elastic beam of finite length which floats freely on
the surface of an ideal incompressible fluid is studied in a linear treatment. The fluid flow is considered potential. The
beam deflection is sought in the form of an expansion in the eigenfunctions of beam vibrations in vacuum with time-dependent
amplitudes. The problem reduces to solving an infinite system of integrodifferential equations for unknown amplitudes. The
memory functions entering this system are determined by solving the radiation problem. The beam behavior is studied for various
loads with and without allowance for the weight of the fluid. The effect of fluid depth on beam deformation was determined
by comparing with the previously obtained solutions of the unsteady problem for a beam floating in shallow water.
__________
Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 47, No. 1, pp. 85–94, January–February, 2006. 相似文献
87.
Zhaoxia Liu 《Journal of Mathematical Analysis and Applications》2011,382(2):731-747
In this paper, we consider the elliptic system of two equations in H1(RN)×H1(RN):
88.
Patrizio Cintioli 《Mathematical Logic Quarterly》2011,57(5):517-523
Given a reducibility ?r, we say that an infinite set A is r‐introimmune if A is not r‐reducible to any of its subsets B with |A\B| = ∞. We consider the many‐one reducibility ?m and we prove the existence of a low1 m‐introimmune set in Π01 and the existence of a low1 bi‐m‐introimmune set. 相似文献
89.
In this work, we consider the Lie point symmetry analysis of a strongly nonlinear partial differential equation of third order, the ∞‐Polylaplacian, in two spatial dimensions. This equation is a higher order generalization of the ∞‐Laplacian, also known as Aronsson's equation, and arises as the analog of the Euler–Lagrange equations of a second‐order variational principle in L∞. We obtain its full symmetry group, one‐dimensional Lie subalgebras and the corresponding symmetry reductions to ordinary differential equations. Finally, we use the Lie symmetries to construct new invariant ∞‐Polyharmonic functions. 相似文献
90.
Nguen Min' Tri 《Mathematical Notes》2002,71(3-4):517-529
This paper contains examples of nonhypoelliptic infinitely degenerate elliptic differential operators. Global nonsmooth solutions of the corresponding homogeneous equations are constructed. 相似文献