The first-order perturbation method is used to evaluate approximate phase velocities and polarization vectors in elastic anisotropic media. Formulae are given which make possible computations of perturbations of these parameters for quasi-compressional as well as quasi-shear waves, no matter whether the...
3) linear first-order perturbation technique 一阶线性摄动法 1. Based on a linear first-order perturbation technique,the dynamic stiffness and damping coefficients were calculated,respectively. 用有限差分法循环迭代求解新型螺旋油楔动静压轴承油膜压力的雷诺方程和变阶梯结构的流量控制方程,采用一阶线性摄动...
1. A first-order perturbation is used to study the loss properties in such waveguide. 本文从对称金属包覆波导的模式本征方程出发,利用贵金属(金或银)介电系数实部为负值,且绝对值远大于其虚部的特性,采用一阶微扰理论研究了此类波导的损耗特性,得到了TE和TM导模的微扰传播常数的解析公式。
unperturbed Hamiltonian is 0H and has eigenstates n n n u E u H 0. The perturbation is an additional term in the Hamiltonian, I H , where is a dimensionless parameter small compared with unity. It is convenient to introduce this parameter as a clear indication that the perturbation is ...
1.Based on alinear first-order perturbation technique,the dynamic stiffness and damping coefficients were calculated,respectively.用有限差分法循环迭代求解新型螺旋油楔动静压轴承油膜压力的雷诺方程和变阶梯结构的流量控制方程,采用一阶线性摄动法计算轴颈扰动情况下轴承的动态刚度和阻尼系数,研究了这些系数随轴承参数...
optical testing/ first-order perturbationreflective surfacesinterferometric testingmirrorsoptical path differencecentre-of-curvature null testsThe equations are derived which relate first-order perturbations of a mirror surface to the optical path difference (OPD) function observed during interferometric centre-...
In this correspondence, we show that not only the noise subspace, but also the signal subspace, contribute to the first-order perturbation of the singular vectors. We further show that the contribution of the signal subspace does not impact on the performance analysis of algorithms that rely on...
These expressions are obtained using a first-order perturbation analysis and are formulated in terms of the second-order moments of the noise, such that apart from a zero mean, no assumptions on the noise statistics are required. Simulation results exhibit an excellent match between the obtained ...
The lowest order (1/c2) perturbation theories recently developed [1, 2] to decribe the relativistic corrections to valence orbital energies in both Hartree-Fock and generalized Phillips-Kleinman pseudopotential theories are tested numerically for single valence electron atoms drawn for the entire ...
Fast first-order perturbation approach to the surface structural problem using low energy electron diffractiondoi:10.1016/0039-6028(95)01031-9Electron-solid interactionsscatteringdiffractionLow energy electron diffraction (LEED)Surface StructureWe use first-order renormalized forward scattering coupled to a ...