Aimed at the problem of angelica’s agricultural practice ,early bolting rate and high incidence of Ditylenchus Destructor, he experiment got a lucubrate on growth rules of angelica’s formative medicinal value.

Determination of the CDW to Minimize the Weighted Number of Early and Tardy Jobs;

The strongly NP-hard and polynomial time approximation scheme(PTAS) was proposed to minimize the weighted number of early and tardy jobs together with the window location penalty.

In order to eliminate hidden production and inventory problems which cause high costs, for example, waiting time, delivery time, extra labour costs, rework and order changes, manufacturers must consider scheduling problems involving not only the tardiness penalties, but also the early costs.

Ordering lead time decision based on Stackelberg game;

Impacts of demand lead time distribution on bullwhip effect;

Manufacturer′s delivering the goods with lead times in JIT systems;

Taking the Dongqu Coalmine as the example, this paper introduces the causes and features of the formation of the collapsing column, analyzes on the influence of the collapsing column on the coal production, and puts forward some effective methods for the advanced detection of the collapsing column.

Application of pre-dressing in magnetic separation plant;