Having analyzed the correlations between the monthly UVB change and the flue-cured tobacco per hectare yield,the first-class tobacco proportion,as well as the tobacco chemical constituents respectively,It argued that there exists an evident negative correlation between the quantity variation of the atmospheric ozone and the flue-cured tobacco output,the first-class tobacco proportion.

The results showed that the related degree between cocoon yield/10000 silkworms and ten main quantitative characters was cocoon weight>cocoon shell weight>egg weight per moth>cocoon rate at the fourth instar stage>good egg rate>rate of dead cocoons>normal cocoon rate>cocoon shell percentage>cocoon rate of the same,which can provide the reference for directional raising and breeding of silkworm.

The relationship of the cutting dust with primary influence factors is analyzed Taking aim at decreasing cutting dust, roadheader design parameters forming minimum dust per unit coal output are sought by means of optimization method The study shows that dust production per unit coal output of a roadheader may be reduced about 20% after optimized design by this method.