In this article, We consider two important models for second order sublinear differential equations: the existence of infinitely many subharmonic solutions for Duffing equation with bounded restore force and for the sublinear impact oscillator.

Boundary restore algorithm of 3D constrained delaunay triangulation;

Evaluation model for revegetation potentiality of sand dust sources in farming-pastoral ecotone in Northern China;

An overview on the resilience of social-ecological systems;

Evaluation of ecosystem resilience in the regions across Qinghai-Tibet railway based on GIS;

The Adaptive Cycle Mechanim and Versue Arid Resilience of Rural Social-Ecological System in the Loess Plateau;

The study results of the shape memory property of the film after annealing and crystallization show that the film has 180 MPa of maximum recovery stress and 2.

The constraint transformation behavior of 7% strained TiNi alloy was investigated, and the experimental results show that the recovery stress formed at the first constraint transformation thermal cycling is the highest, and then decreases with increasing the constraint transformation thermal cycling number.