An investigation of the rock magnetic properties using stepwise IRM acquisition, thermomagnetic analysis and remanent characteristics, identifies magnetite as the carrier of the main fraction of the remanence for the paleosoil unit S1 in the Dingbian, Weinan, Xifeng loess sections.

Perimeter blasting technique,which can decrease the blasting vibration and harmfulness on fixed slope,is used in the Zhangbagou Limestone Mine.

A new method based on adjoint system and minus system to compute unstable equilibrium points on the stability boundary of power system classical model is proposed.

Firstly, the Taylor series solution of a partial differential equation is used to approximate the stability boundary in the neighborhood of an unstable equilibrium point.

The characteristic invariant manifolds are some special low-dimensional invariants on the stability boundary.

The results indicate that the seismic responses of pier under the viscous-spring boundary are less than that under the fixed boundary,and the seismic responses of pier on the site with the frozen layer are much less than that without the frozen layer.

In numerical manifold method,fixed boundary is treated by penalty function method.

In addition in view of the factors of drainage and load of side slope are considered corresponding measures are proposed to stable side slope and ensure the safety of buildings.