In the evaluation of gravel filling sand prevention, the filling coefficient is one of important parameters to evaluate gravel filling whether good or not.

Based on the bulk model of rock resistivity, the experimental formula of porosity was developed, the “filling coefficient”expression was also derived from the consistence of the filling coefficient and porosity.

Researches on filling coefficients for stability of soil stratum permeability;

Based on the comparison between theoretical calculation and test results,this paper suggests that the filling coefficient of c.

Confirmation of new photodetector and its fill factor;

The integration technique is applied to 256×256 PtSi CCD, and has made its fill factor increased by 2.

The results show that the performances of graded gravel mixture are improved significantly after being treated with cement and lime,especially when fill factor is 0.

The numerical method of the space-time conservation element and solution element(CE/SE) is deduced to simulate the interior flow of pulse detonation engine(PDE) with different filling coefficients.

Under same excess coefficient α,and various filling coefficients β,the detonation pressures are measured,and the factors influencing detonation pressures are analyzed.

A full focusing filling factor is introduced.

At present the cell array lens is usually cylinder or hemispheroid whose fill-factor(the ratio of light area and total area) can achieve about 90.

But at present the cell array lens is usually cylinder or hemispheroid, although the hexagons arrange is used, whose fill-factor (the ratio of light area a.