Restoration of large abdominal wall defects with artificial mesh and myocutaneous flap;

In consideration of the environmental hydrogeological problems,necessity and probability of artificial recharge are analysed,management model of water resources system in the mining region is set up and is solved by a dualization simplex method.

To rationally exploit underground water resources ,to achievesustainable use of water resources, Daqing city government decided toartificial recharge groundwater, Construction of underground reservoir.

In the south edge of Horqin sandy land,taking serious desertification grassland as subject,the effects of reseeding on vegetation restoration in desertification grassland are researched by designing artificial reseeding tests and investigating the vegetation characteristics in desertification grassland which adopted the measures of airplane seed sowing in last 9 years.

The paper mainly discusses how to re-obtain oxygen artificially by aeration of wetted constructures based on current data of urban water circumstances,in order to improve river environment with low cost and high efficiency because the aeration of wetted con strucfures in water net can be promoted by certain technical measures.