Base on the concept of image point diameter, formula was obtained to estimate concentration limit when particle-imaging technique was used for measuring particulateflow.
基于像点直径的概念，推导了颗粒成像法测量颗粒场时的最大极限浓度估算公式。
2
Soft start valves are used to throttle the gas flow in roughing lines. They prevent turbulences in piping and containers, particulate contamination in vacuum installations.
软启动阀适用于在粗加工过程中调节燃气气流，能防止管道和容器中的气体动荡、真空装置的微粒污染等。
3
Based on the developed electrical regeneration method in former study, the electrical regeneration automatic control system of diesel wall flow ceramic particulate filter was discussed in this paper.