Based on the Dar Zarrouk curves and the conception of longitudinal conductance and transverse resistance,a direct inversion method of one-dimension direct current sounding curves is derived.

This paper points out the advantages that the apparent longitudinal conductance is used to analyse the transient electromagnetic sounding data.

During the research process of Gansu Province 2005 annual research project "Applicable research of electromagnetic imaging system in coal geological exploration",put forward a set of method to raise electric prospecting resolution and accuracy of interpretation-apparent longitudinal conductance imaging method.

A new method based on multi-model prediction is proposed for the longitudinal guidance of re-entry ve-hicles with trajectory and control constraints.

A method based on linear matrix inequalities (LMI) constraints was presented for the re-entry longitudinal guidance law with intricate constraints.

Based on the theory of elastodynamics,the longitudinal guided wave and flexural guided wave group velocity dispersion curves for M22 stud were calculated.