The major problems in this technology are PAC penetrating filter material layer and the great shorten of the filter cycle owing to the growthrate of filter head loss is so quickly.
该投加点面临的主要问题是活性炭穿透滤料层以及水头损失过快增长导致滤池过滤周期的大幅度缩短。
2
The results show that rare earth elements can efficiently improve the structures of the Chromvanadizing layer, the rate of growth and properties of diffusion layer.
结果表明，稀土元素能有效地改善铬钒共渗层结构，提高共渗层生长速度和性能。
3
The influence of growth parameters including gas flow, C/Si ratio, growth temperature and pressure on growthrate and layer uniformity in thickness and doping are discussed.