For further development of the application domain of cellulose and exploiting new green cellulosic fibers,a new cotton fiber coated with collagen was prepared by the limited selective oxidation of the fiber with sodium periodate and subsequent treatment with the solution of collagen in this paper.

A position servo sysetm operation principle of REPM dualredundancy limited angle torque motor is introduced.

A design and fabricating method was presented to meet the measurement requirement of LABLTM(limited-angle brushless torque motor),and this kind of measurement method carried on precise measurement based on differential spiral inductive transducer,finally carried on the experimental confirmation.

A new type of limited-angle brushless DC motor with sector stator and rotor was presented,which could obviously reduce its size and weight.

The method for computing finite rotations is different from that of the translation displacements.

Basing on rotation vector method,Euler angles method and finite rotations method,the coning motion and its influence were discussed.

In describing the finite rotation in thin-shell structures,rotation vectors are adopted in the present work,which correspond to the orthogonal tensor that indicates normal rotations of the shell mid-surface.

Based on the explanation of the property and summation rule of finite rotation,the corresponding formulae of the variation of the axis of rotation is deduced.

By taking full advantage of the kinematic model of a rigid line and the finite rotation matrix, the simplification assumptions such as small displacement, small normal or shearing strain, small rotation, as well as small loading step etc can be abandoned.