Through dual iterative computation,the vibration of rigid cable with fixed-ends will be controlled by active stiffness control method conveniently.

To solve the eigenvalue problem for an asymmetric real matrix(dependent on frequency)in the computation of the acoustic-structural coupled vibration for underwater structures,the Dual Iteration Method to compute natural frequencies and shape modes of vibration for underwater structures is presented based on the Adjoint Subspace Iteration Method.

The double iterative of model iterative and flow iterative is given.

The surface height can be reconstructed accurately from a synthetic image by the iterative calculus,which provides a feasible approach for extracting the surface shape of fabric image.

The accuracy of iterative calculus was verified by recovering surface height of an object from its synthetic image, and the application of the calculus has been extended to reconstruct surface height from remote sensing image.

It introduces gaussian projection,this paper is based on the gaussian projection formula,using relatively simple iterative calculation of geodetic coordinates reverse the effect and the direct use of the same anti-formula.