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   688篇
  免费   177篇
  国内免费   51篇
化学   232篇
晶体学   3篇
力学   74篇
综合类   15篇
数学   284篇
物理学   308篇
  2023年   4篇
  2022年   27篇
  2021年   45篇
  2020年   26篇
  2019年   17篇
  2018年   22篇
  2017年   36篇
  2016年   38篇
  2015年   31篇
  2014年   60篇
  2013年   51篇
  2012年   42篇
  2011年   61篇
  2010年   42篇
  2009年   38篇
  2008年   61篇
  2007年   53篇
  2006年   36篇
  2005年   19篇
  2004年   33篇
  2003年   23篇
  2002年   19篇
  2001年   19篇
  2000年   13篇
  1999年   21篇
  1998年   8篇
  1997年   6篇
  1996年   10篇
  1995年   6篇
  1994年   6篇
  1993年   6篇
  1992年   5篇
  1991年   4篇
  1990年   6篇
  1989年   5篇
  1987年   3篇
  1986年   2篇
  1985年   1篇
  1984年   1篇
  1983年   1篇
  1980年   1篇
  1979年   4篇
  1978年   1篇
  1977年   3篇
排序方式: 共有916条查询结果,搜索用时 734 毫秒
1.
Binzhong Li  Baida Lü   《Optik》2003,113(12):535-540
Based on the beam coherence-polarization (BCP) matrix, the polarization property of coherent and incoherent Gaussian beam combinations is studied in detail. The general expressions for the degree of polarization P of the resulting beam in case of incoherent and coherent combinations are derived. It is shown that P is dependent on the incoherent or coherent combination, propagation distance, separation, azimuth of the polarization plane and numbers of beamlets in general. The irradiance distribution of the resulting beam for the coherent cases depends on the azimuth of the polarization plane of beamlets. However, for the incoherent case it does not.  相似文献   
2.
The combination technique has repeatedly been shown to be an effective tool for the approximation with sparse grid spaces. Little is known about the reasons of this effectiveness and in some cases the combination technique can even break down. It is known, however, that the combination technique produces an exact result in the case of a projection into a sparse grid space if the involved partial projections commute.

The performance of the combination technique is analysed using a projection framework and the C/S decomposition. Error bounds are given in terms of angles between the spanning subspaces or the projections onto these subspaces. Based on this analysis modified combination coefficients are derived which are optimal in a certain sense and which can substantially extend the applicability and performance of the combination technique.  相似文献   

3.
赵德钧 《数学杂志》2006,26(3):335-342
本文研究一类多元Gauss-Weierstrass算子的线性组合加Jacobi型权逼近的性质,利用加权矩量不等式及加权K-泛函、光滑模等工具,建立了这类算子在Lp(1≤p≤∞)空间的正、逆定理和逼近阶的特征刻划.  相似文献   
4.
结合2006年全国大学生数学建模竟赛D题,借助Matlab软件,通过数学建模,计算出有关煤矿瓦斯和煤尘的3个主要安全指标,从而为解决煤矿实际安全生产提供了参考.  相似文献   
5.
本文根据极值分布理论,提出了一个由原始分布和尾分布组成的组合分布模型,研究了组合分布模型中原始分布和尾分布的确定方法,建立了组合分布模型参数估计的加权最优化模型,实例计算说明,组合分布较好地反映了风险变量极值事件的风险。  相似文献   
6.
7.
By virtue of the technique of integration within an ordered product of operators, we derive the normal ordering expansion of a one- and two-mode combination squeezing operator for two harmonic oscillators with coordinatemomentum coupling. It turns out that this squeezing operator just diagonalizes the Hamiltonian H = p21/2m1 m1ω21x21/2 p22/2m2 m2ω22x22/2 - λx2p1, so its ground state is a one- and two-mode combination squeezed state.Quantum fluctuation in the ground state is calculated.  相似文献   
8.
本文利用ω2rφλ(f,t)代替ωrφλ(f,t)给出了Szász-Kantorovich算子线性组合同时逼近的估计。  相似文献   
9.
After the laser was invented in 1960, a phase conjugation mirror has been respected to be the most fantastic one for the laser resonator composition because it can compensate any distortions of the laser beams occurred by the many inhomogenuities of the laser media and optical components. Among the many phase conjugation configurations, the stimulated Brillouin scattering phase conjugation mirror is the most simple one and many researchers have tried to utilize it to develop high power/energy laser systems. For realizing a high energy/power laser system the thermal problem is the most difficult to solve, and some researchers suggested a beam combination technique to reduce the thermal load of the big laser media to many small sized ones. To accomplish the beam combination using stimulated Brillouin scattering phase conjugation mirrors (SBS-PCMs), it is necessary to lock/control the phases of the SBS-PCMs. And some researchers have developed several ways for it, but they can lock the phases of a limited number of beams overlapped at the foci less than 5, or lock the phases by back-seeding technique but it loses the phase conjugation characteristics. For realization of the laser fusion driver, it is necessary to combine more than 10 or 100 beams. And the authors have developed recently a new phase controlling/locking technique which is isolated and independent totally from other beams and it can be applied to an unlimited number of beams in principle.  相似文献   
10.
组合原则回溯   总被引:1,自引:1,他引:0  
曹肇基 《大学物理》1998,17(9):29-31,47
从组合原则产生的背景和关键入手,分析和叙述了里兹的组合原则在光谱学上的重要意义,同时,也阐述了它与玻尔氢原子理论之间的关系。  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