The authors describe and compare in detail several main methods used in leakage detection for landfill liners,including groundwater monitoring method,diffusion hoses method,capacitance sensors method,tracers method,electro\|chemical sensing cables method and electrical method,etc.

This article introduces the application methods and characteristics of Edison emulational software, and illustrates the feasibilities of its application in middle school s electrics experiments and finds the relative problems need being noticed in the practical application by combining with idiographic examples.

Fortunately, the applications of electrical and electrochemical techniques to concrete durability becomes more and more attractive.

Several electricity problems are analyzed by use of Lagrange multiplier method, and some meaningful results are obtained.