A mixed EM algorithm based on partial E-steps method was presented which can reduce the intensity of computation,make it adapted to the scale of data sets better and have the standard convergence guarantee of EM.

For an overlapped multi-target region,a weighted EM iterative algorithm is constructed to calculate the number of targets in it,the statistical and geometric properties of every .

Effects of effective microorganisms on the growth of potatoes;

Based on the experiment,this paper introduced the results of purification of effective microorganisms to domestic sewage,and discussed the effect of puriffcation of Bewage by different effective microorganisms throwing methods.

Effective microorganisms(EM),as a complex of many beneficial microorganisms,play an important role in increasing growth rates of animal,enhancing disease resistance,decreasing the contamination of manure and improving the ecological environment etc.