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delta functions
相关语句
  delta函数
     Delta Functions in Quantum Mechanics
     量子力学中的Delta函数
短句来源
  δ函数的
     If only if the width of the well tends to infinity, or n is very large, and the expanding coefficients on the base of continuous spectrum become to the superposition of two symmetrical delta functions, all of the stationary wavefunctions can be expanded as the superposition of two plane waves.
     仅当势阱宽度趋于无穷大 ,或当 n很大 ,在连续谱基底上的展开系数变为两个中心位置对称的 δ函数的迭加时 ,定态波函数才能表示为两列反向行进的平面波的迭加 .
短句来源
  “delta functions”译为未确定词的双语例句
     Dirac Delta Functions and Infinitesimal Analysis
     Dirac δ—函数与无穷小分析
短句来源
     In this paper,we have established the existence and uniqueness of radially weak solutions of a N-dimensional(N > 2) parabolic equation in which Dirac delta functions appear as coefficients.
     在本文中,我们证明了一个二阶线性抛物方程N-D(N>2)径向弱解的存在和唯一性。
短句来源
     The equation we consider is of mathematical interest as it involves the Dirac delta functions and the degeneracy at r = 0 in the equation.
     此方程在数学上的研究兴趣在于其系数包含了单边Dirac函数和其径向解在r=O处的退化性。
短句来源
     An analytical expression is presented for the weighting matrix of a set of time-differencial measurements based on the close relationship between covariance matrix and second-differencial matrix as well as the special property of Delta functions.
     基于相关权逆阵和二次差分矩阵的对应关系,利用Delta函数的性质,推导了时序差分组合的相关权矩阵公式,并利用M atlab对解析表达式进行了数值验算。
短句来源
  相似匹配句对
     Delta Functions in Quantum Mechanics
     量子力学中的Delta函数
短句来源
     Dirac Delta Functions and Infinitesimal Analysis
     Dirac δ—函数与无穷小分析
短句来源
     Jasmonate and Its Functions
     茉莉素及其功能
短句来源
     Scaling Functions
     一个尺度函数簇
短句来源
     THE FAULT DELTA
     断块型三角洲
短句来源
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  delta functions
Using Timoshenko's shell theory, a basic regularized functional of total energy without any distributions (Dirac's delta functions) has been considered.
      
We consider the prescribing of singularities in inviscid fluid flows by including Dirac delta functions in the Euler momentum equation.
      
In contrast to techniques described in the literature, the proposed approach can be applied to arbitrary images rather than to images which can be represented by a few Gaussian or delta functions.
      
In order to describe relaxation processes-creep and relaxation-during a short initial period, the principal part of the influence functions is isolated in the form which generates Dirac delta functions.
      
A study is made on the interaction between coplanar cracks in an unbounded body when dynamic loads act on thier surfaces that are described as Heaviside or Dirac delta functions.
      
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Based on Robinson's work, and two-phase calculus, the Dirac Delta function has been discussed in some detail. Four kinds of δ-function in physics have been analysed (in the stratified coordinate systems) by the introduction of a general definition of Dirac Delta function in M②, and each kind has been given a separate expression, making it possible to solve the product of δ-functions spontaneously in M. δ3(x) which is obtained from the normalization of De Broglio wave has beengiven special...

Based on Robinson's work, and two-phase calculus, the Dirac Delta function has been discussed in some detail. Four kinds of δ-function in physics have been analysed (in the stratified coordinate systems) by the introduction of a general definition of Dirac Delta function in M②, and each kind has been given a separate expression, making it possible to solve the product of δ-functions spontaneously in M. δ3(x) which is obtained from the normalization of De Broglio wave has beengiven special attention in this article. It is noted that if x is a finite number and not infinitesimal in R, then the function δ3(x) at a finite distance is not necessarily infinitesimal. The theory of δ-function based on Stieljes integral can not explain this important property and some other properties.

本文运用两相微积分学,深入研究了狄拉克δ函数。通过在M②中引入δ函数的一般定义,对物理中常见的四种δ函数进行具体分析,给出了每一种的显式表达,使δ函数的乘积问题可自然得到解决。文中特别讨论了由德布洛衣规格化所得到的δ_3(χ),指出:δ_3(χ)在有限远处(即当χ在*R中是非无限小的有限数时)函数值并不一定为无限小,而建立在Sfieljes积分论上的δ函数理论说明不了这一重要性质以及其他一些性质。

The Dirac delta function is associated with the spline function and their characteristics and algorithm are used to calculate the internal forces and deformation of beams. General equations that simplify the calculation of shear forces, bending moments, slopes and deflection of an ordinary beam have been derived.

本文把δ函数和样条函数联系起来,利用它们的特性和运算规律计算梁的内力和变形,给出了一般梁的剪力、弯矩、转角和挠度的昔遍方程式,运算简便。

By using numerical method, the superconducting critical temperature Tc is cal-culated from the Eliashberg equation and the dependence of Tc on λ and the shape of effective phonon spectrum is investigated. In this study, α2F(ω) is taken as the double delta-function spectrum and the spectrum parameters are permited to change over a wide range. It is found with surprising that in the regime of λ < (?), i.e. outside the convergence circle of the Tc series solution, Tc depends, not only on λ and ratios...

By using numerical method, the superconducting critical temperature Tc is cal-culated from the Eliashberg equation and the dependence of Tc on λ and the shape of effective phonon spectrum is investigated. In this study, α2F(ω) is taken as the double delta-function spectrum and the spectrum parameters are permited to change over a wide range. It is found with surprising that in the regime of λ < (?), i.e. outside the convergence circle of the Tc series solution, Tc depends, not only on λ and ratios of moments but also on (?), the reciprocal of the convergence radius of the Tc series solution, and the relation between them shows a certain regularity. Under the light of these results, an approximate Tc formula for the case of μ* = 0 is constructed in the regime of λ < (?) through fitting the numerical solution of Eliashberg equation,

本文用数值解方法从Eliashberg方程计算出超导临界温度T_c,并考察T_c对有效声子谱的依赖关系。在这个研究中,a~2F(ω)被取为双δ函数谱,并允许其中的谱参数可以在很宽范围内改变。作者发现在λ<∧区域(即在T_c级数解的收敛圆外),T_c除了依赖λ和矩比外,还依赖T_c级数解的收敛半径倒数Λ;它们之间的关系是有规律的。在这些结果的启示下,本文在μ=0情形,用弥合数值解的方法得到一个适用于λ<Λ区域的T_c近似公式。 接着,本文作者对吉光达和吴杭生的一篇文章进行了研究,指出:该文提出的超导体分类建议及其工作的主要结论是对的。但其中对决定A型超导体临界温度主要参量问题进行的分析,只适用于这样一些A型超导体,它们的收敛半径倒数Λ或者比λ_0小,或者虽比λ_0大、但λ又小于λ_0,其中λ_0是个依赖谱形状的参量,它的定义在正文中给出。对另一些A型超导体(λ_0<λ<Λ),决定T_c的主要参量不再是λ,而是δ=1/∧~(0.5)(_(1/2)/ω_(log))~(5.5)λ~(1.55)。

 
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