Establishment of integrated method for forecasting fractures using regressive curvature and its application in Luxi Sag.;

Let Nn+p be an n+p-dimensional locally symmetric complete quasi-constant curvature Riemannian manifold and Mn be an n-dimensional compact sub-manifold in Mn+p with paralleled mean curvature vector.

This paper presents a necessary and sufficient condition that the recurrent hypersurface M in a Riemannian space with quasi-constant curvature is locally symmetric,and shows that the complete irreducible birecurrent hypersurface M in a Riemannian space with quasi-constant curvature is recurrent if the generating element of N is a normal vector field or pungent vector field of M.

We generalize the two theorems of submanifolds in constant curvature manifolds to the external sphere mani-folds in quasi-constant curvature.

Designing the submergence depth of sucker rod pump with curve fitting;

Ultrasound contrast quantitative analyzing based on curve fitting algorithm;

The curve fitting applies in AIDS therapy appraisal and in the curative effect forecast;

Flight Simulation and Curve-fitting for the Characteristics of Aircraft;

Curve-fitting in Designing Magnetic Steel of PM Electrical Machine;

This paper deduces the formulas about capacitance and voltage when the pretilt angle isn't zero, and presents the method to determine the elastic constants k11 and k33 simultaneously by curve-fitting.