We apply effective dipole approximation to investigate the equivalent dielectric constant of inclusion and the effective response and optical absorption in composites media of metal spherical particles.The dielectric constant varies along the radius of the particles.ε_e exhibits a monotonic decrease with the power index n while the dielectric constant shows a power law gradation.The presence of the gradation in metal particles yields a resonant optical absorption peak.It shows red-shift with m_ω and m_ν of the metal-dielectric composites.

Numerical calculations on Josephson junctions under microwave radiation are made by means of Runge-Kutta method in the RSJ model. The DC I-V curves of Josephson junctions reproduce experimental results very well.

This paper deals mainly with applications of the finite-element method in numerical simulation of neutron well-logging.In the frame of multigroup P₁ approximation the neutron transport equation is soluted by using finite-element method and the two-dimentional finite-element code FEMLOG is developed for the numerical simulation of neutron well-logging.The precision of numerical results of FEM-LOG is satisfactorily comparable to that of the international common code DOT4.2.However FEM-LOG is operated on the computer far faster than DOT4.2.