annual equation
1.Using annual total amount of population from 1949 to 1982 and composition of population age in 1982, we have abtained a trend equation of population, that is p=1327.62+50.27t+0.058t~2-0.0039t~3 and found that the average bearing rate of each woman, β=1.5 was the best result in solution of the equation on the development of population.
2.Abstract: According to the base flow separation results from hydrographs in many watershed,the best regression equation expressing the relationship between annual precipitation infiltration coefficient and the weight of different strata area to total area of the watershed is established.The equation can be used to calculate the precipitation infiltration recharge for different ground water basins in which the strata distribution and the precipitation are given.The precipitation recharge is equivalent to the ground water recharge in some mountainous area where the exploitation of ground water resources are far from being sufficient.
4.<ABSTRACT> This paper shows using the regression equation, which is permuted with the regression coefficient between the wool yield after three shearings and annual wool yield, to estimate the wool production performance in German Angora rabbits, The estimate value is more close to actual annual wool yield than the estimate value got by the method which is used generally in West Germany.
