According to the characteristics of Michelson interferometer, a interferometer with unequal arms is designed for the measurement of tiny deformation.

A new inequilateral organic polyamine, 2-aminoethyl-bi(3-aminopropyl)amine, was synthesized by the additional and hydrogenation reaction of aminoacetonitrile with acrylonitrile.

According to mechanics character of expanded branches and plates and load transfer theory, a method of expanded branches and plates pile foundation settlement calculation is present.