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   11篇
  完全免费   4篇
  物理学   15篇
  2013年   2篇
  2012年   1篇
  2011年   1篇
  2010年   2篇
  2009年   1篇
  2007年   1篇
  2004年   1篇
  2002年   1篇
  1999年   1篇
  1997年   2篇
  1986年   1篇
  1979年   1篇
排序方式: 共有15条查询结果,搜索用时 109 毫秒
1.
求一类非线性偏微分方程解析解的一种简洁方法   总被引:31,自引:1,他引:30       下载免费PDF全文
谢元喜  唐驾时 《物理学报》2004,53(9):2828-2830
通过引入一个变换和选准试探函数,进行求偏导数运算,将非线性偏微分方程化为代数方程,然后用待定系数法确定相应的常数,最后得到其解析 解.不难看出,这种方法特别简洁.  相似文献
2.
凑合反推法──流体力学变分原理建立的一条新途径   总被引:6,自引:0,他引:6  
凑合反推法是刘商联系统方法[1]的进一步发展,应用这种方法可以方便地构造各种亚广义变分原理及广义变分原理,并可以消除临界变分现象.对于任何二维守恒型流体力学方程,作者推导得到了其广义变分通用公式.几个实例证明这种方法是有效的、简单的,并具有普遍的意义.  相似文献
3.
含时二维双耦合各向异性谐振子的严格波函数   总被引:3,自引:0,他引:3       下载免费PDF全文
凌瑞良  冯金福  胡云 《物理学报》2010,59(2):759-764
坐标与动量通过一个特殊的转动变换,成功完成哈密顿量的退耦合,进而采用尝试函数求得了质量和频率均不相等且均含时的双耦合二维谐振子的严格波函数.波函数的正确性在其普遍性讨论中得到印证. 关键词: 各向异性谐振子 转动变换 退耦合 尝试函数  相似文献
4.
质量和频率均含时的耦合谐振子的严格波函数   总被引:2,自引:0,他引:2       下载免费PDF全文
凌瑞良  冯金福 《物理学报》2009,58(4):2164-2167
通过坐标和动量变换,在去掉系统哈密顿量耦合项的基础上,采用试探函数方法求得了质量和频率均随时间变化且具有耦合的两谐振子的严格波函数. 关键词: 耦合谐振子 去耦合 坐标与动量变换 试探函数  相似文献
5.
本文根据静电场的唯一性定理,运用两介质区内的电势分布试探函数Φ1和Φ2,证明两均匀介质中位于无限大分界平面两侧的电荷之间的相互作用力服从牛顿第三定律  相似文献
6.
The emergent flux for radiation transfer in a homogeneous half-space with internal source solved in terms of the diffuse reflection problem. An efficient method of analysis which utilizes trial functions based on Cases eigenvalues is developed for solving the problem. Numerical results are given and compared with the previous results.  相似文献
7.
The static effective potential for a scalar field with Φ6 interaction is calculated using the effective action in Schrödinger picture formalism. It is found that the effective potential obtained is same as the Gaussian effective potential as far as static case is concerned. Equivalence with the CJT formalism can also be established. As in CJT formalism after renormalization an unrenormalized mass term persists. Nonzero turning points are obtained both for positive and negativeλ. Results are analysed numerically. Graphical analysis indicates a behaviour similar to that obtained for CJT formalism at zero temperature.  相似文献
8.
A variational principle is formulated which enables the mean value and higher moments of the solution of a stochastic nonlinear differential equation to be expressed as stationary values of certain quantities. Approximations are generated by using suitable trial functions in this variational principle and some of these are investigated numerically for the case of a Bernoulli oscillator driven by white noise. Comparison with exact data available for this system shows that the variational approach to such problems can be quite effective.  相似文献
9.
It is shown that if the ‘mean excitation energy’ assumption is introduced in the Brillouin-Wigner perturbation series, then the resulting series can be exactly summed. The implications of the result for calculating energy shift and for constructing trial functions are examined with special reference to the ground state of the helium atom.  相似文献
10.
曹瑞  张健 《中国物理 B》2013,(10):182-185
In this paper, the trial function method is extended to study the generalized nonlinear Schrodinger equation with time- dependent coefficients. On the basis of a generalized traveling wave transformation and a trial function, we investigate the exact envelope traveling wave solutions of the generalized nonlinear Schrodinger equation with time-dependent coefficients. Taking advantage of solutions to trial function, we successfully obtain exact solutions for the generalized nonlinear Schrodinger equation with time-dependent coefficients under constraint conditions.  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