全文获取类型
收费全文 | 73篇 |
免费 | 0篇 |
专业分类
化学 | 1篇 |
力学 | 1篇 |
数学 | 62篇 |
物理学 | 9篇 |
出版年
2021年 | 3篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2013年 | 4篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 6篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有73条查询结果,搜索用时 0 毫秒
11.
12.
13.
A. M. Savchuk A. A. Shkalikov 《Proceedings of the Steklov Institute of Mathematics》2013,283(1):181-196
We consider the inverse problem of recovering the potential for the Sturm-Liouville operator Ly = ?y″ + q(x)y on the interval [0, π] from the spectrum of the Dirichlet problem and norming constants (from the spectral function). For a fixed θ ≥ 0, with this problem we associate a map F: W 2 θ → l D θ , F(σ) = {s k } 1 ∞ , where W 2 θ = W 2 θ [0, π] is the Sobolev space, σ = ∫ q is a primitive of the potential q ∈ W 2 θ ? 1 , and l D θ is a specially constructed finite-dimensional extension of the weighted space l 2 θ ; this extension contains the regularized spectral data s = {s k } 1 ∞ for the problem of recovering the potential from the spectral function. The main result consists in proving both lower and upper uniform estimates for the norm of the difference ‖σ ? σ 1‖ θ in terms of the l D θ norm of the difference of the regularized spectral data ‖s ? s1‖ θ . The result is new even for the classical case q ∈ L 2, which corresponds to the case θ = 1. 相似文献
14.
A. A. Shkalikov 《Differential Equations》2009,45(4):580-590
We consider the operator function L(α, θ) = A(α) ? θR of two complex arguments, where A(α) is an analytic operator function defined in some neighborhood of a real point α 0 ∈ ? and ranging in the space of bounded operators in a Hilbert space ?. We assume that A(α) is a dissipative operator for real α in a small neighborhood of the point α 0 and R is a bounded positive operator; moreover, the point α 0 is a normal eigenvalue of the operator function L(α, θ 0) for some θ 0 ∈ ?, and the number θ 0 is a normal eigenvalue of the operator function L(α 0 θ). We obtain analogs and generalizations of well-known results for self-adjoint operator functions A(α) on the decomposition of α- and θ-eigenvalues in neighborhoods of the points α 0 and θ 0, respectively, and on the representation of the corresponding eigenfunctions by series. 相似文献
15.
We prove a theorem on the completeness of the system of root functions of the Schrödinger operator L = ?d 2/dx 2 + p(x) on the half-line R+ with a potential p for which L appears to be maximal sectorial. An application of this theorem to the complex Airy operator L c = ?d 2/dx 2 + cx, c = const, implies the completeness of the system of eigenfunctions of L c for the case in which |arg c| < 2π/3.We use subtler methods to prove a theorem stating that the system of eigenfunctions of this special operator remains complete under the condition that |arg c| < 5π/6. 相似文献
16.
Following earlier papers reporting experimental establishment of cross-relaxation via the phonon field in the rf range, this paper theoretically demonstrates how energy migration via the phonon field in the optical range can be increased to experimentally detectable values. 相似文献
17.
We study Schrödinger operatorsT+Q, whereT=?Δ is the Laplace operator andQ is the multiplication operator by a generalized function (distribution). We also consider generalizations for the case of the polyharmonic operatorT = (-δ) n 相似文献
18.
Mathematical Notes - 相似文献
19.
Mathematical Notes - 相似文献
20.
Mathematical Notes - Asymptotic formulas as x→∞ are obtained for a fundamental system of solutions to equations of the form $$lleft( y right): = {left( { - 1} right)^n}{left(... 相似文献