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Port of wheel cranes are popularly applied in the logistics, and their lifting, luffing and slewing mechanisms generally adopt DC motors. Traditional method with stepwise resistors to start motors was very complex in calculation and control, but poor performance. Considering specific conditions of wheel cranes, a composited excited system and a new approach with dynamic resistors based on IGBT to start DC motors are presented. By expounding the principle, selection and control method, it illustrates the dynamic resistors could be simple in calculation and control, and could make motors linearly start and smoothly run. Examples prove that the dynamic resistors are perfectly practicable in port of wheel cranes for their small size, simple control method, excellent property and suitability for different DC motors.

The first book to interleave Minnie Vautrin's diary on the Rape of Nanking with that of her Chinese assistant Tsen Shui-fang from December 8, 1937 to March 1, 1938 day by day. In addition to over 160 annotations by the editors, the volume contains biographical sketches of the women, a note on the two diaries, a chapter on the aftermath of the Rape, two lengthy reports on the Rape of Nanking from Vautrin's correspondence in the Appendix and a selected bibliography.

A series of highly dispersed ionic liquid catalysts were prepared by immobilized acidic ionic liquid [BMIM]HSO4 in silica gel through sol-gel methods. The structures and properties of the catalysts were characterized by FT-IR, SEM and XRD. The results showed the [BMIM]HSO4 had been successfully confined or encapsulated in a silica-gel matrix.