Previous studies showed that the municipal sewage with low salinity could achieve self-purification by microbial reactions in sewer.

An experimental research was carried out to simulate the operating condition of low,middle and high concentration town sewage treatment by activated sludge system in sewer lines and ditches.

City sewers are responsible for water circulation and recovery in a city.

Based on the detailed introduction of research and application of hyperbaric welding repair technology all over the world, the authors think that it is necessary to develop the hyperbaric underwater pipeline repairing system domestically, and analyze the key points in developing this system.

A new technology which firms the underwater pipeline by fiber reinforced mats is put forward.

The intent of this project is to find a solution of underwater dry maintenance and repairs for underwater pipeline and structures.

Service methods and instrumentation for offshore pipelines are different from those on land because of their vastly differing performance and environments.

Mechanic behavior of wall soil and liner of underwater tunnel;

Research on the Minimum Rock Cover Thickness of Underwater Tunnel in Alternating Layers of Hard and Soft Rocks;

Shiziyang tunnel on Guangzhou-Shenzhen-Hong Kong passenger-dedicated railway,which has a design speed of 350km/h,is a milestone in underwater tunnel construction in China.

In order to launch rocket-assisted torpedo with submarine torpedo tube,the general scheme and trajectory plan of the submarine-launched rocket-assisted torpedo carrier were presented,and the underwater trajectory mode of this torpedo inclining to leave water and yawing to elude submarine was designed.

This paper presents a simulation method of a certain air-launched mine′s underwater trajectory based on Matlab/Simulink.

Using the formula, a software for underwater trajectory prediction was programmed.

On process design and construction technique of launching way of caisson precasting yard;