The author uses entirety and systematicness of mathematical knowledge and excavats the horizontal and vertical relationship of the mathematical knowledge in order to summarize several solutions to the problems of the parameter sphere of equation.

The application of the general method in mathematical problem solving is discussed; especially, the parametric mapping method is analysized as a basic form of the general method.

Capacihve meisture sensor regards frequency signal as variability, it is made up of capacitive probe, high frequency surge cirouit, dispart frequency instrument and metal shield box.

By using this method not only the periodic solutions of the 2nd order parametric systems under external excitation can be solved, but the stability of these periodic solutions can also be decided.

By means of an isoparametric transformation,the stiffness matrix and the effective nodeforces of the parallelogram element are calcnlatel.

The quadrature formula about surface integral on any quadrilateral element is deduced by means of isoparametric transformation and bilinear interpolation.

An approximation format of tetrahedral isoparametric element for solving the 3-dimensional 2-order Dirichlet problem is presented in this paper first,then based on the optical estima- tion of isoparametric transformation,we prove the convergence of the format given,obtain the optical H~1 estimate error.

The Analysis on the Response Characteristics of Pipelines With Changing Parameters Under Random Traffic Loads;