This article introduces that the construction of the old bridge rehabilitation at Xinkou station,under the condition of narrow construction site and being influenced by the catenery,in order to ensure the safety of train operation,the temporary road scheme is dropped and instead the D-shaped auxiliary girders are employed to strengthen the line.

First-order D-type iterative learning control for a class of nonlinear systems;

The classical D-type ILC law depends on the relative degree of the controlled system.

D-type iterative learning control(ILC)law is one of the main laws of ILC.

By analyzing the forming condition of D-type graphite cast iron,the paper describes the influence of trace alloy elements on the structure and property of D-type graphite cast iron.

In this paper, the optimization of chemical composition of austenitic cast iron with D-type graphite was introduced.

The influence of alloying element Ti on the formation of D-type graphite was analyzed from two aspects.

Ni resist castings of D type graphite can be obtained by the addition 20% Ni and 0.

Compact Spinning Technology and D-draft in Ramie Ring Frame;