The purpose of this paper was to prove some strong and weak convergence theorems of the modified implicit iteration sequence to a common fixed point for a finite family of asymptotically nonexpansive mappings in Banach spaces. The results presented here improve many recent works.
The design of the system involved requirement analysis, functional and interface designs,combining the actual hydrological and meteorological data. Manmachine interaction interface was developed by using VB, FORTRAN, and MATLAB. The system has functions of numerical forecasting, data analysis and data storage. This integrated visualized system forecasted the water levels and setup of No.0509 Matsa Typhoon successfully by adjusting the model parameters according to the actual measurment of wind and water levels.
According to the characters of runoff and fertilization, the runoff process in the farmland was divided into paddy field fertilization period, paddy field growth period and dry land period. Based on the fieldwork in Shanghai area, the regress model of nonpoint source pollution in these three types of farming period were developed. There is difference between the simulated and actual precipitations situations. Nitrogen concentration during the simulated precipitations varied between 28 mg•L-1 and 45 mg•L-1, with the precipitation density at 2 mm•min-1, and the nitrogen concentration during the actual precipitation varied between 0.2 mg•L-1 and 4.0 mg•L-1, with the precipitation density varing between 0.037 6 mm•min-1 and 0.075 1 mm•min-1. Based on the long-term precipitation data and nitrogen loss in the groundwater, by the modified SCS method the annual nitrogen load in the farmland was calculated, and the value is 26.5 kg•ha-1.
Since introduced into the Chongming Dongtan Nature Reserve in 1995,Spartina alterniflora has rapidly expanded and seriously threatened the biodiversity there.During 2005 and 2006, a field experiment of physical controls, including digging tillage, breaking rhizome, cutting, and biological substitute,on S.alterniflora was conducted to search effective measures for controlling this invasive plant.The growth parameters of density, coverage and aboveground biomass were used to evaluate the efficiency of different treatments.The results showed that for the digging tillage treatments, the density, coverage and aboveground biomass were significantly lower than that of the control and there were no significant difference among the different depth treatments.In the end of the second growing season, there were no significant differences among the treatments and the control.The treatments of breaking rhizome significantly inhibited the growth of S.alterniflora in the first growing season and inhibition increased with the depth of treatments.However, the inhibition of growth disappeared after two growing seasons and there were no significant differences among the treatments and the control.The treatments of cutting significantly inhibited the growth of S.alterniflora in the first growing season.In the end of the second growing season, the growth of S.alterniflora recovered in some extent, only the treatments of JUN, JUL, AUG and SEP significantly inhibited its growth.In the biological substitute treatment, the transplanted Phragmites australis kept a relatively high survival in the first growing season.The survival rate maintained at the level of 54.2% and both the plant height and fruiting increased considerably in the second growing season.The results demonstrated that it is necessary to take into account of frequency, intensity and season of these measures to achieve a high efficiency for controlling the invasion of S.alterniflora.
中国综合性科技类核心期刊(北大核心)
