首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   394篇
  免费   20篇
  国内免费   21篇
力学   15篇
综合类   6篇
数学   258篇
物理学   156篇
  2023年   4篇
  2022年   2篇
  2021年   4篇
  2020年   8篇
  2019年   5篇
  2018年   7篇
  2017年   8篇
  2016年   10篇
  2015年   3篇
  2014年   17篇
  2013年   28篇
  2012年   11篇
  2011年   19篇
  2010年   19篇
  2009年   28篇
  2008年   36篇
  2007年   24篇
  2006年   18篇
  2005年   23篇
  2004年   21篇
  2003年   18篇
  2002年   21篇
  2001年   11篇
  2000年   16篇
  1999年   8篇
  1998年   14篇
  1997年   15篇
  1996年   14篇
  1995年   3篇
  1994年   4篇
  1993年   1篇
  1992年   3篇
  1990年   1篇
  1989年   1篇
  1988年   2篇
  1987年   1篇
  1986年   2篇
  1985年   1篇
  1984年   2篇
  1982年   1篇
  1978年   1篇
排序方式: 共有435条查询结果,搜索用时 15 毫秒
1.
Using a quantitative version of the subdifferential characterization of directionally Lipschitz functions, we study the integrability of subdifferentials of such functions over arbitrary Banach space.

  相似文献   

2.
3.
Correspondence is established between sigma models, minimal surfaces and the Monge–Ampére equation. The Lax pairs of the minimality condition of the minimal surfaces and the Monge–Ampére equations are given. Existence of infinitely many nonlocal conservation laws is shown and some Bäcklund transformations are also given.  相似文献   
4.
The construction of non-Abelian affine Toda models is discussed in terms of its underlying Lie algebraic structure. It is shown that a subclass of such non-conformal two-dimensional integrable models naturally leads to the construction of a pair of actions, which share the same spectra and are related by canonical transformations.  相似文献   
5.
The Nambu-bracket quantization of the hydrogen atom is worked out as an illustration of the general method. The dynamics of topological open branes is controlled classically by Nambu brackets. Such branes then may be quantized through the consistent quantization of the underlying Nambu brackets: properly defined, the quantum Nambu-brackets comprise an associative structure, although the naive derivation property is mooted through operator entwinement. For superintegrable systems, such as the hydrogen atom, the results coincide with those furnished by Hamiltonian quantization - but the method is not limited to Hamiltonian systems.  相似文献   
6.
全变差有界函数列的一致(R)可积性   总被引:4,自引:0,他引:4  
给出了一致有界单调函数列一致可积性定理 ,由此得出全变差序列有界的收敛函数列的一致可积性 .说明了该结论可判断一些非一致收敛函数列的逐项积分性质 .  相似文献   
7.
The paper studies the Painlevé VIe equations from the point of view of Hamiltonian nonintegrability. For certain infinite number of points in the parameter space we prove that the equations are not integrable. Our approach uses recent advance in Hamiltonian integrability reducing the problem to higher differential Galois groups as well as the monodromy of dilogarithic functions.   相似文献   
8.
The solution transformations and properties of the R-matrices for two-component systems under these transformations are analyzed in details.Not all transformed R-matrices can be put into the Skalyanin‘s formalism.For those R-matrices with all required properties,the effects of solution transformations to the six-and eight-vertex systems with open boundary conditions are discussed.these effects can be one of the following types:the Hamiltonian is invariant or transposition-invariant or made in a similarity transformation,or its coupling coefficients are multiplied by an overall factor,or the spin of the system is rotated around the z axis or/and reflected with respect to some plane.In these cases,the transformed systems remain to be integrable.  相似文献   
9.
The sequential procedures developed by Starr (1966, Ann. Math. Statist., 37, 1173–1185) for estimating the mean of a normal population are further analyzed. Asymptotic properties of the regret and first two moments of the stopping rules are studied and second-order approximations are derived.  相似文献   
10.
We consider the problem of minimum risk point estimation for the parameter =a+b of the exponential distribution with unknown location parameter and scale parameter when the loss function is squared error plus linear cost. In this paper, we propose a sequential estimator of and show that the associated risk is asymptotically one cost less than that given by Ghosh and Mukhopadhyay (1989,South African Statist. J.,23, 251–268).  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号