(1) Keywords: fractal, nucleate boiling, floc, biological aggregates.

(2) To gain a good settleability, good activated sludge floc must be formed first of all.

(3) In this paper , the fractal theory of floc structure is briefly addressed.

(4) The way to influence the concrete strength is floc and arborization formed in concrete.

(5) The floc formed has better sedimentation property, and easily be separated from water.

(6) Floc concentration distribution in a dynamic flocculator with a flat vane wheel was measured experimentally.

(7) Floc size distribution in a dynamic flocculator with a flat vane wheel was measured experimentally.

(8) Objective:To evaluate the presence of subpleural strip and floc as an aid in the diagnosis and differentiation of the lung contusion from other diseases of the lung.

(9) The treatment of low strength wastewater under mesophilic temperatures was investigated in an anaerobic baffled reactor inoculating with anaerobic floc sludge.

(10) At the same time, the appropriate preozonation can increase the effective density of the floc, making the floc more dense and improving its sedimentation capacity.

(11) Addition of collector or non-polar oil emulsion to extremely fine mineral suspension can intensify induction of hydrophobic flocculation of extremely fine mineral particles, forming floc.