Methods To use the plat natural sedimentation method,collect the specimens of the air and count the germs at every 10min under the static state and working condition from BSC room pasteurized and purified and the fringe area of BSC pasteurized only.

The natural precipitation method was performed for 10-minute exposure, and the impacting method was performed by FA-1 airborne bacteria sampler at flow rate of 28.

[Methods]Natural sedimentation method was used for the sampling according to the Hygienic Standard for Hospital Disinfection (GB 1598 2-1995) and the Technological Standard for Hospital Disinfection in 2002.

In order to know the status of bacterial contamination of air of clean operating room in the course of operation and its influencing factors,natural sedimentation method was used to sample the air of 10 clean operating rooms.

In order to observe the efficacy of trichloroisocyanuric acid in killing microorganisms in indoor air, plate sedimentation method was used for examination.

Its operating principle lists as follows: first flushing fluid expelled from wellhead is decompressed throw sieve vessel,then sand,water and oil are separated by way of double natural sedimentation,finally,oil is recovered,water is recycled,and sa.

The free settling experiments for high-concentration material slurry of cement-full tailing backfill at a different ratio and different concentration are conducted and the effects of the related factors on settling property of the slurry are analyzed.

Free settling tests for tailings from the concentrator in the previous period were carried out.