Study on the coated cemented carbide with gradient structure by a special sintering technology;

Coated cemented carbide with gradient structure;

Effects of carburizing process on gradient structure and hardness of WC-Co gradient cemented carbides;

With the system analysis framework and from the view of system structure and incomplete contract, this paper points out the system factors, which obstruct the tradable permit policy in China, mainly result from the defect of system structure of tradable permit.

Analysis is carried out on the mechanism of tendering system and the system structure from perspective of assets right,transaction cost,principal and agent relationship of large hydroelectric power construction project.

With the system analysis framework and from the view of system structure and incomplete contract,this paper points out the system bottle-neck,which obstructs the tradable permit policy in China,mainly results from the defect of system structure of tradable permits.

It is proved with core sample data from Linhuan mining area that the permeability of the bottom aquifers in each section is determined by granularity structure,and the complex correlation index between clay contents and uneven index is up to 83.

Separation and purifying andrographolide by supercritical carbon dioxide gradient crystallization were made.

Shallow crustal velocity structure and hidden faults of Kunming city region;

The relationship between distribution of earthquake and the velocity structure;

Detecting variation of near-surface velocity structure near Xiadian buried fault with transient multi-channel surface wave;