The accident of leaking water in mine tunnel gives the fire force new subject and new requirement.

Study of Database Construction of Karst Caves in China;

High-frequency seismic prospecting used to find caves in the rock-mass below stakes;

When it was being drilled,a vertical well was drilled at first,and caves were made in coalbed gas sect,then a horizontal well were drilled at a distance of 200 m,horizontal segment were in connection with the caves,and 10 branch holes were lateral drilled symmetrically in horizontal sect.

Detecting badger cave disease in embankment by ground penetrating radar;

Grouting applied to treatment of roadbase cave in loess areas;

When the ion cyclotron resonance heating is adopted in Tokamak, in order to protect the antenna in a better way, the antenna is usually placed in the cavity.

A finite element method with perfectly matched layers(PML) is developed for wave scattering from a two-dimensional cavity embedded in an infinite ground plane.

Ecological Characteristics of Tibetan Fox Dens in Shiqu County Sichuan Province, China;

Preliminary Study on Structure of the Wolf Dens in Eastern Inner Mongolia;

In this paper, preliminary studies on wolves denning habitat selection in Eastern prairie of Inner Mongolia show clearly that the main factors affecting the dens are human disturbance and the source of water, others are hiding conditions, slope ,etc.