On river closure of Chaijiaxia hydropower project;

Construction and management of Huaihe river closure for Linhuaigang flood control project;

Construction of rock retaining sills at the river bed during river closure for the diversion channels of Three Gorges project;

Research on stability of riprap influenced by boundary of riverbed during river closure;

Diversion and closure design of Hongjiadu Hydropower Station;

Study on Measures of Reducing the Difficulty of River Closure;

This modle incorporates all inherent features of circuit breakers such as arcing time,chopping current,dielectric recovery.

In this paper, the chopping current characteristic of vacuum switchgear is studied numerically when it interrupts the current with harmonic components.

Li Tianhe once proposed a model to explain the reason why different materials have different chopping current level by means of the curves or graph to solve the model.

, interception, through fall and stem flow.

Hydraulic experiments on tracing and forecasting were done with the entire hydraulic model of the cut-off of the Three Gorges Project during the whole processes of the cut-off of the second-project of river s cut-off and the third-project of open channel s cut-off of the Three Gorges Project.

With the excavation and gas drainage technology simultaneously at the coal wall drilling,the gas emission cut-off rate of the experiment gateway side wall in Chenjiashan Mine was over 75% and could effectively prevent gas content over the limit in thick seam gateway driving face.