The results show that,mineral and chemical composition of weathered stock have better long term stability in engineering environmental condition,but grain composition has worse stability owing to its mineral composition and microcope struture characteristics.

For understanding the long term stability of weathered sand used in Maopinxi Protection Dam of Three Gorges Project,by simulated laboratory experiments,the effects of lnng term inundation and dry wet repetitive conditions on the characteristics of weathered sand were emphatically studied.

Preliminary research on formation and long-term stability of cliff along the bank of the Three gorges reservoir;

Effect of different factors on long-term stability of semiconductor gas sensor;

Numerical analysis of the long-term stability of large-scale underground cavern of hydropower station;

Comparative study of primary stability of immediate loading of single-threaded, double-threaded and triple-threaded implants based on a three-dimensional finite element analysis;

Influence of thread design on the primary stability of immediately loaded dental implants;

The key to the success of immediate implant and immediate loading lays in the primary stability of dental implant which decided by the design of dental implant in addition to host factors and iatrogenic factors.