An introduction to basic points of viewing about metabolic networks,network rigidity and metabolic engineering,especially to the working hypotheses regarding metabolic rigidity and “carrying pathway”.

With an introduction to the main characteristics of flexible catenary and rigid catenary as well as their utilization in some foreign countries, the author argues that China shall lay stress on the development of overhead rigid catenary, because the present condition is very favorable for domestic production.

The components and functions of the inspecting and measuring car of rigid catenary system, the test items and their principle and some problems existing in tests are presented.

With the development of rail transit in modern cities and the construction of OCS in the tunnel with low headroom ,rigid catenary system are used in broad, now parameters inspection and evaluation about it have become a new hot focus in exploitation and study of catenary parameters inspection system.

On Guangzhou metro Line 2 a rigid catenary system was firstly adopted in China.

A network performance classification method based on fuzzy clustering;

Application scheme of rebuilding network of agricultural bank and analysisof network performance;

Promotion for network performance using load balanced;

The Design of Grid Information Service Mechanism Based on Network Attributes;